Optical lens and camera module

Abstract

The embodiment of the utility model relates to the technical field of cameras, and provides an optical lens and a camera module. The optical lens comprises a plurality of lenses, the optical lens comprises a first lens group, a second lens group and a third lens group which are arranged from an object side to an image side, the first lens group and the third lens group have positive focal power, and the second lens group has negative focal power; the second lens group comprises one lens, and the second lens group can move along the optical axis of the optical lens, so that the optical lens can focus and image between the infinity and the nearest position; the displacement S of the second lens group on the optical axis when the second lens group is focused at the infinity and the nearest position and the focal length f2 of the second lens group meet the relational expression:-1.13 < = S / f2 < =-0.08. The optical lens can achieve the purposes of light weight and high image quality while quickly focusing between an infinity position and a nearest position.

Description

Technical Field

[0001] The present application relates to the field of camera technology, and in particular to an optical lens and a camera module. Background Art

[0002] Relatively speaking, an optical lens with a large aperture can produce a shallower depth of field, which can separate the subject from the background even when shooting in a low-light environment, achieving a beautiful bokeh effect. This is especially useful when taking portraits, still lifes and other types of photos.

[0003] To improve shooting efficiency, autofocus lenses have become a priority. Therefore, the question is how to develop an optical lens suitable for ordinary photography enthusiasts that can display full-frame images while also balancing fast focus, lightweight design, and high image quality. Utility Model Content

[0004] The embodiments of the present application provide an optical lens and camera module that can quickly focus between infinity and the closest point while achieving both lightweight and high image quality.

[0005] To achieve the above objectives, the embodiments of the present application adopt the following technical solutions:

[0006] In a first aspect, an embodiment of the present application provides an optical lens. The optical lens includes a plurality of lenses, the optical lens including a first lens group, a second lens group, and a third lens group arranged from the object side to the image side, the first lens group and the third lens group having positive optical power, and the second lens group having negative optical power; the second lens group includes one lens, and the second lens group is capable of moving along the optical axis of the optical lens so that the optical lens focuses on an image between infinity and the closest point; the displacement S of the second lens group on the optical axis when focusing between infinity and the closest point and the focal length f2 of the second lens group satisfy the relationship: -1.13≤S / f2≤-0.08.

[0007] By reasonably allocating the optical focal length of each lens group, aberrations can be well balanced and the resolution can be improved. When the air gap between the first lens group and the third lens group is the same, compared with the movement of multiple lenses, the movement of the second lens group through a lens with negative optical focal length can not only adapt to the image plane displacement caused by different object distance changes, thereby improving the imaging quality, but also relatively reduce the number and weight of lenses, and reduce the power of the driving device for driving the second lens group to move. Therefore, when S2 / f2 satisfies the above conditional expression, not only can the displacement S of the second lens group on the optical axis be controlled within an appropriate range, but also the accuracy requirement of the driving device for driving the second lens group to move is reduced, thereby achieving fast focusing and lightweight while realizing fast focusing and clear imaging within a wide range of object distances.

[0008] In some embodiments, the combined focal length f2 of the second lens group and the combined focal length f3 of the third lens group satisfy the relationship: -1.26≤f2 / f3≤-0.86.

[0009] By properly selecting the above parameters, when the ratio f2 / f3 satisfies the above relationship, the tendency of spherical aberration or coma aberration to increase due to focusing can be effectively suppressed.

[0010] In some embodiments, the length OAL1 of the first lens group in the optical axis direction and the combined focal length f1 of the first lens group satisfy the relationship: 0.75≤OAL1 / f1≤1.15.

[0011] By reasonably selecting the above parameters, when the ratio OAL1 / f1 satisfies the above relationship, the optical lens can better correct aberrations such as spherical aberration, coma and field curvature while ensuring that the length of the first lens group is within an appropriate range, thereby improving imaging quality.

[0012] In some embodiments, the length OAL3 of the third lens group in the optical axis direction and the back focal length BFL of the optical lens satisfy the relationship: 1.48≤OAL3 / BFL≤2.45.

[0013] By reasonably selecting the above parameters, when the ratio OAL3 / BFL satisfies the above relationship, the optical lens can better take into account the back focal length while ensuring that the length of the third lens group is within an appropriate range, thereby facilitating further improving the imaging quality of the optical lens and miniaturizing the design.

[0014] In some embodiments, the lenses in the second lens group are meniscus structures.

[0015] Through the above arrangement, the weight of the lenses in the second lens group is further reduced and the power of the driving device for driving the second lens group to move is reduced, thereby achieving the purpose of achieving both lightweight and fast focusing.

[0016] In some embodiments, the refractive index nd and the Abbe number Vd of the lenses in the second lens group G2 respectively satisfy the relationship: 1.43≤nd≤1.60; 65.4≤Vd≤94.5.

[0017] By properly selecting the above parameters, when the lenses in the second lens group satisfy the above relationship, chromatic aberration can be effectively corrected, improving image resolution and color reproduction.

[0018] In some embodiments, the number of the lenses is 12 to 16.

[0019] The above arrangement is conducive to achieving the goal of balancing optical performance and miniaturization of the optical lens.

[0020] In some embodiments, among the multiple lenses in the optical lens, at least one lens is an aspherical lens.

[0021] Through the above setting, not only can the aberration be corrected well and the resolution be improved, but it is also conducive to the miniaturization of the optical lens.

[0022] In some embodiments, the first lens group includes at least 2 lenses with negative optical power and 3 lenses with positive optical power; the third lens group includes at least 3 lenses with negative optical power and 3 lenses with positive optical power.

[0023] Through the above arrangement, various aberrations can be corrected and compensated well; at the same time, the optical power between the various lens groups can be well balanced, thereby improving the imaging quality of the optical lens.

[0024] In some embodiments, the first lens group includes at least one cemented lens; the third lens group includes at least one cemented lens; wherein the cemented lens is mainly composed of two or three of the lenses.

[0025] Through the above arrangement, the optical lens includes a plurality of cemented lenses, which not only reduces the tolerance sensitivity of the optical lens, thereby further improving the imaging quality, but also facilitates the assembly of the optical lens.

[0026] In a second aspect, an embodiment of the present application provides a camera module, comprising a photosensitive element and the optical lens described in the first aspect, wherein the photosensitive element is arranged on the image side of the optical lens.

[0027] The camera module in the embodiment of the present application has the same structure and technical effects as the optical lens in the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the structure of the optical lens provided in Example 1 of the present application when focusing at infinity;

[0029] Figure 2 This is an axial aberration diagram of the optical lens provided in Example 1 of the present application when focusing at infinity;

[0030] Figure 3 This is a field curvature diagram of the optical lens provided in Example 1 of the present application when focusing at infinity;

[0031] Figure 4 This is a distortion curve diagram of the optical lens provided in Example 1 of the present application when focusing at infinity;

[0032] Figure 5 This is an axial aberration diagram of the optical lens provided in Example 1 of the present application when focusing at the closest point (376.45mm);

[0033] Figure 6 This is a field curvature diagram of the optical lens provided in Example 1 of the present application when focusing at the closest point (376.45mm);

[0034] Figure 7 This is a distortion curve diagram of the optical lens provided in Example 1 of the present application when focusing at the closest point (376.45mm);

[0035] Figure 8 This is a schematic diagram of the structure of the optical lens provided in Example 2 of the present application when focusing at infinity;

[0036] Figure 9 This is an axial aberration diagram of the optical lens provided in Example 2 of the present application when focusing at infinity;

[0037] Figure 10 This is a field curvature diagram of the optical lens provided in Example 2 of the present application when focusing at infinity;

[0038] Figure 11 This is a distortion curve diagram of the optical lens provided in Example 2 of the present application when focusing at infinity;

[0039] Figure 12 This is an axial aberration diagram of the optical lens provided in Example 2 of the present application when focusing at the closest point (377.81mm);

[0040] Figure 13 This is a field curvature diagram when the optical lens provided in Example 2 of the present application is focused at the closest point (377.81mm);

[0041] Figure 14 This is a distortion curve diagram of the optical lens provided in Example 2 of the present application when focusing at the closest point (377.81mm);

[0042] Figure 15 This is a schematic diagram of the structure of the optical lens provided in Example 3 of the present application when focusing at infinity;

[0043] Figure 16 This is an axial aberration diagram of the optical lens provided in Example 3 of the present application when focusing at infinity;

[0044] Figure 17 This is a field curvature diagram of the optical lens provided in Example 3 of the present application when focusing at infinity;

[0045] Figure 18 This is a distortion curve diagram of the optical lens provided in Example 3 of the present application when focusing at infinity;

[0046] Figure 19 This is an axial aberration diagram of the optical lens provided in Example 3 of the present application when focusing at the closest point (372.33mm);

[0047] Figure 20 This is a field curvature diagram when the optical lens provided in Example 3 of the present application is focused at the closest point (372.33mm);

[0048] Figure 21 This is a distortion curve diagram of the optical lens provided in Example 3 of the present application when focusing at the closest point (372.33mm);

[0049] Figure 22 This is a schematic diagram of the structure of the optical lens provided in Example 4 of the present application when focusing at infinity;

[0050] Figure 23 This is an axial aberration diagram of the optical lens provided in Example 4 of the present application when focusing at infinity;

[0051] Figure 24 This is a field curvature diagram of the optical lens provided in Example 4 of the present application when focusing at infinity;

[0052] Figure 25 This is a distortion curve diagram of the optical lens provided in Example 4 of the present application when focusing at infinity;

[0053] Figure 26 This is an axial aberration diagram of the optical lens provided in Example 4 of the present application when focusing at the closest point (386.19mm);

[0054] Figure 27This is a field curvature diagram when the optical lens provided in Example 4 of the present application is focused at the closest point (386.19mm);

[0055] Figure 28 This is a distortion curve diagram of the optical lens provided in Example 4 of the present application when focusing at the closest point (386.19mm).

[0056] Among them, the reference numerals in the figures are:

[0057] First lens group G1; second lens group G2; first lens L1; second lens L2; third lens group G3; fourth lens group G4; fifth lens group G5; first lens L1; second lens L2; third lens L3; fourth lens L4; fifth lens L5; sixth lens L6; seventh lens L7; eighth lens L8; ninth lens L9; tenth lens L10; eleventh lens L11; twelfth lens L12; thirteenth lens L13; fourteenth lens L14; fifteenth lens L15; aperture stop STOP; protective plate CG. DETAILED DESCRIPTION

[0058] For ease of understanding, the English abbreviations and related technical terms involved in the embodiments of this application are explained and described below.

[0059] Focal power is equal to the difference between the convergence of the image-side beam and the convergence of the object-side beam. It characterizes the ability of an optical lens to deflect light.

[0060] A lens or lens group with positive optical power has a positive focal length and has the effect of converging light.

[0061] A lens or lens group with negative optical power has a negative focal length and has the effect of diverging light.

[0062] Focal length, also known as focal length, is a measure of the convergence or divergence of light in an optical lens. It refers to the vertical distance from the optical center of a lens or lens group to the focal plane, when an infinitely distant object is formed into a sharp image on the focal plane. For a fixed-focus lens, the position of its optical center is fixed; for a telephoto lens, changes in the optical center result in changes in the focal length.

[0063] The effective focal length (EFL) of a lens refers to the distance from the center of the lens to the focal point.

[0064] The combined focal length is the combination of the focal lengths of the individual lenses in the lens group.

[0065] The object side is divided by the lens. The side where the object is located is called the object side, and the surface of the lens close to the object side is called the object side.

[0066] The image side, with the lens as the boundary, the side where the image of the object is located is called the image side, and the surface of the lens close to the image side is called the image side.

[0067] The aperture (aperture diaphragm) is a device used to control the amount of light passing through the lens and entering the photosensitive surface inside the camera body. It is usually inside the lens.

[0068] The imaging plane is located on the image side of all lenses in the optical lens, and is the plane on which the image is formed after the light passes through each lens in the optical lens in sequence.

[0069] The optical axis is an axis that passes vertically through the center of the lens. The optical axis of the lens is the axis that passes through the centers of each lens of the lens.

[0070] Focus is the point where parallel light rays converge after being refracted by a lens or group of lenses.

[0071] The Abbe number (Abbe), also known as the dispersion coefficient, is the difference ratio of the refractive index of an optical material at different wavelengths, representing the degree of dispersion of the material.

[0072] Aberration: An optical lens has the properties of an ideal optical system at the optical axis. The near-axis light emitted from a point on the object intersects the image plane at a point (also known as the optical axis image point). However, the light rays that actually pass through the lens with different apertures are unlikely to intersect perfectly at a point, but instead have a certain deviation from the position of the near-axis image point. These differences are collectively called aberrations.

[0073] Field curvature, also known as "image field curvature", is a condition in which the intersection of the entire light beam does not coincide with the ideal image point. Although a clear image point can be obtained at each specific point, the entire image plane is a curved surface.

[0074] Distortion, also known as distortion, is the degree to which the image formed by an optical lens is distorted relative to the object itself. Distortion is caused by spherical aberration. The difference between the intersection of the principal rays of light from different fields of view and the Gaussian image plane after passing through the optical lens is not equal to the ideal image height.

[0075] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0076] In the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0077] like Figure 1 As shown, an embodiment of the present application provides a camera module. The camera module includes an optical lens and a photosensitive element, wherein the photosensitive element is located on the image side of the optical lens.

[0078] The working principle of the camera module is as follows: the light reflected by the photographed scene generates an optical image through the optical lens and is projected onto the photosensitive surface of the photosensitive element. The photosensitive element converts the optical image into an electrical signal, namely an analog image signal, and transmits it to the processor.

[0079] Among them, the photosensitive element (also called image sensor, Figure 1 The image on the far right is a semiconductor chip with hundreds of thousands to millions of photodiodes on its surface. When exposed to light, they generate an electric charge. The photosensitive element can be a charge-coupled device (CCD) or a complementary metal-oxide semiconductor (CMOS). CCDs are made of a highly sensitive semiconductor material that converts light into an electric charge. A charge-coupled device (CCD) is composed of many photosensitive units, usually measured in millions of pixels. When the surface of the photosensitive element is exposed to light, each photosensitive unit reflects an electric charge on the component. The signals generated by all the photosensitive units are added together to form a complete image.

[0080] like Figure 1 As shown, a protective sheet CG is usually provided on the photosensitive element, which can carry and protect the photosensitive element.

[0081] Among them, the optical lens mainly uses the refraction principle of the lens to form an image, that is, the light of the scene passes through the optical lens, forming a clear image on the focal plane, and the image of the scene is recorded by the photosensitive element located on the focal plane.

[0082] like Figure 1 As shown, an embodiment of the present application provides an optical lens. The optical lens includes a first lens group G1, a second lens group G2, and a third lens group G3 arranged from the object side to the image side. The first lens group G1 and the third lens group G3 have positive refractive power, and the second lens group G2 has negative refractive power.

[0083] The second lens group G2, also known as the focusing group, primarily moves along the optical axis of the optical lens to focus the lens between infinity and the closest point. This "focusing" refers to the production of a clear image. During the movement of the second lens group G2, the first lens group G1 and the third lens group G3 remain stationary relative to the photosensitive element.

[0084] By reasonably allocating the optical focal length of each lens group, aberrations can be well balanced and the resolution can be improved. When the air gap between the first lens group and the third lens group is the same, compared with the movement of multiple lenses, the movement of the second lens group through a lens with negative optical focal length can not only adapt to the image plane displacement caused by different object distance changes, thereby improving the imaging quality, but also relatively reduce the number and weight of lenses, and reduce the power of the driving device for driving the second lens group to move. Therefore, when S2 / f2 satisfies the above conditional expression, not only can the displacement S of the second lens group on the optical axis be controlled within an appropriate range, but also the accuracy requirement of the driving device for driving the second lens group to move is reduced, thereby achieving fast focusing and lightweight while realizing fast focusing and clear imaging within a wide range of object distances.

[0085] It should be noted that, compared with the second lens group having positive optical power and used for focusing, the second lens group having negative optical power is easier to compress the total length of the optical lens, making the lens more compact.

[0086] like Figure 1 The structure of the optical lens of Example 1 of the present application is shown. This optical lens comprises a first lens group G1, a second lens group G2, and a third lens group G3 arranged from the object side to the image side, totaling 14 lenses, and an aperture stop STOP, which is located between the first lens group G1 and the second lens group G2. The first lens group G1 and the third lens group G3 have positive focal power, while the second lens group G2 has negative focal power.

[0087] The first lens group G1 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6 and a seventh lens L7. The fourth lens L4 and the fifth lens L5 are cemented together to form a cemented lens.

[0088] The second lens group G2 includes an eighth lens L8; the third lens group G3 includes a ninth lens L9, a tenth lens L10, an eleventh lens L11, a twelfth lens L12, a thirteenth lens L13, and a fourteenth lens L14. The tenth lens L10 and the eleventh lens L11 are cemented together to form a cemented lens; the twelfth lens L12 and the thirteenth lens L13 are cemented together to form a cemented lens.

[0089] The second lens group G2 can move along the optical axis of the optical lens to enable the optical lens to achieve focused imaging between infinity and the closest point. At the same time, the first lens group G1 and the third lens group G3 remain stationary relative to the photosensitive element.

[0090] Table 1a to Table 1g respectively give the specific parameter values of each lens of the optical lens of an optional embodiment in Example 1 of the present application.

[0091] Table 1a

[0092] Surface number Surface type R-value thickness Refractive index Abbe number Physical Surface spherical surface flat D0 Side 1 spherical surface 154.57 4.67 1.92 20.88 Surface 2 spherical surface -374.22 0.15 Surface 3 spherical surface 1491.20 1.40 1.53 48.84 Surface 4 spherical surface 75.98 9.60 Side 5 Aspheric 76.95 1.67 1.59 61.25 Side 6 Aspheric 57.05 8.00 Surface 7 spherical surface -38.67 1.30 1.85 23.78 Surface 8 spherical surface 86.41 8.07 1.88 39.22 Side 9 spherical surface -60.77 0.15 Face 10 spherical surface 116.48 8.46 1.44 95.10 Side 11 spherical surface -57.79 0.15 Face 12 spherical surface 75.80 7.06 1.59 68.62 Surface 13 spherical surface -113.46 0.98 aperture spherical surface flat D14 Surface 15 spherical surface 250.54 1.18 1.49 70.44 Surface 16 spherical surface 29.00 D16 Face 17 spherical surface 47.67 5.38 1.95 17.94 Face 18 spherical surface -232.99 0.15 Face 19 spherical surface 70.02 5.54 1.80 46.57 Surface 20 spherical surface -56.04 1.20 1.85 23.78 Surface 21 spherical surface 33.11 2.07 Surface 22 spherical surface 76.27 7.54 1.88 39.22 Surface 23 spherical surface -25.58 4.66 1.75 25.05 Face 24 spherical surface 71.45 4.63 Surface 25 Aspheric -23.11 2.00 1.85 40.10 Surface 26 Aspheric -30.80 14.14 Surface 27 spherical surface flat 2.00 1.52 64.2 Surface 28 spherical surface flat 0.50 Image plane spherical surface flat -

[0093] It should be noted that in Table 1a, the "surface number" is the number of each surface arranged in sequence from the object side to the image side, and the radius R value is the lens with the corresponding surface number, that is, the radius of curvature of the object side or image side of the lens corresponding to each surface number at the optical axis, and the "infinity" of the lens in the "curvature radius" parameter series means that the object side or image side of the lens is a plane; the first value of each lens in the "thickness / spacing" parameter series is the thickness of the lens on the optical axis, and the second value is the distance from the image side of the lens to the object side of the next lens on the optical axis; the value of the aperture STOP in the "thickness" parameter series is the distance from the center of the aperture STOP to the object side of the next lens on the optical axis; the second to last value in the surface number, for example, the value of the "thickness" of "surface 27" in this embodiment corresponds to the thickness of the protective sheet CG in the optical lens; "image plane" is the abbreviation of the imaging surface of the corresponding optical lens, and in this embodiment refers to Figure 1 The imaging surface "IMAGE" on the far right of the optical lens shown.

[0094] In this embodiment, when the optical lens is focused between infinity and the closest point, the values "D14" and "D16" at the thickness in Table 1a are variable parameters. Specifically, the above parameters "D14" and "D16" refer to Table 1b.

[0095] Table 1b

[0096] D0 (object distance) Infinity Closest focusing point (376.45mm) D14(mm) 1.22 8.67 D16(mm) 19.66 12.21

[0097] In this embodiment, the lenses at the 3rd and 14th positions from the object side to the image side, that is, in this embodiment, Figure 1 The third lens L3 and the fourteenth lens L14 are aspherical lenses. That is, both the object-side and image-side surfaces of the third lens L3 and the fourteenth lens L14 are aspherical, as shown in "Surface 5," "Surface 6," "Surface 25," and "Surface 26" in Chart 1a. Using aspherical surfaces in these locations can effectively reduce optical lens aberrations, particularly spherical aberration.

[0098] The aspheric surface shape of the above aspheric lens meets the following conditions:

[0099]

[0100] Where c is the curvature corresponding to the radius of curvature R, y is the radial coordinate (its unit is the same as the lens length unit), k is the conic coefficient (when the k coefficient is less than -1, the surface curve is a hyperbola, when the k coefficient is equal to -1, it is a parabola, when the k coefficient is between -1 and 0, it is an ellipse, when the K coefficient is equal to 0, it is a circle, and when the k coefficient is greater than 0, it is an oblate), A4, A6, A8, A10, A12, A14, and A16 are high-order aspheric coefficients. The definition of aspheric surface shape will not be repeated below.

[0101] In the embodiment, surface 5, surface 6, surface 25 and surface 26 in Table 1a are aspherical surfaces. Table 1c below shows the conic coefficients and high-order aspherical coefficients of the aspherical lens of this embodiment.

[0102] Table 1c

[0103] Surface number k A4 A6 A8 Side 5 0 -2.89E-06 -1.88E-09 -4.85E-11 Side 6 0 1.80E-06 4.04E-09 -6.90E-11 Surface 25 0 7.61E-05 -1.52E-07 -1.05E-10 Surface 26 0 7.32E-05 -1.31E-07 -7.19E-10 Surface number A10 A12 A14 A16 Side 5 1.12E-13 -9.27E-17 0 0 Side 6 1.62E-13 -1.44E-16 0 0 Surface 25 1.41E-12 -2.47E-15 0 0 Surface 26 9.64E-13 -1.46E-15 0 0

[0104] The optical parameters of the optical lens in this embodiment are shown in Table 1d below.

[0105] Table 1d

[0106] f Effective focal length when focusing at infinity (mm) 52.03 Fno aperture 1.25 w Half field of view angle when focusing at infinity (°) 22.61 H Half image height (mm) 21.60 TTL Total optical length (mm) 123.53 BFL Back focal length (mm) 16.64 <![CDATA[f G1 ]]> Focal length of the first lens group (mm) 49.99 <![CDATA[f G2 ]]> Focal length of the second lens group (mm) -67.39 <![CDATA[f G3 ]]> Focal length of the third lens group (mm) 70.67 S Focus shift of the second lens group 7.45 <![CDATA[OAL1]]> Length of the first lens group along the optical axis (mm) 50.68 <![CDATA[OAL3]]> Length of the third lens group in the axial direction (mm) 33.17

[0107] The parameters of the optical lens in Example 1 satisfy the relationship shown in Table 1e.

[0108] Table 1e

[0109] Relational S / f2 f2 / f3 OAL1 / f1 OAL3 / BFL Numerical -0.111 -0.954 1.014 1.993

[0110] Note: The following are explanations of the relationship between the optical lenses in each embodiment:

[0111] S is the movement of the second lens group G2 along the optical axis of the optical lens between infinity and the closest point, also known as the focus distance of the optical lens;

[0112] f is the effective focal length of the optical lens;

[0113] BFL is the back focal length of the optical lens;

[0114] TTL is the total optical length of the optical lens;

[0115] f1 is the combined focal length of the first lens group G1;

[0116] f2 is the combined focal length of the second lens group G2;

[0117] f3 is the combined focal length of the third lens group G3;

[0118] OAL1 is the length of the first lens group G1 along the optical axis (i.e., the distance along the optical axis from the first lens closest to the object side of the first lens group G1, i.e., the object-side surface of the first lens L1, to the lens surface closest to the image side);

[0119] OAL3 is the length OAL3 of the third lens group G3 in the optical axis direction.

[0120] The positive and negative conditions of the optical power of each lens in the optical lens of Example 1 are shown in Table 1f.

[0121] Table 1f

[0122]

[0123] It should be noted that the "+" and "-" in Table 1f represent the positive and negative optical power of each lens in the optical lens of Example 1. Among them, "+" represents that the lens has positive optical power; "-" represents that the lens has negative optical power.

[0124] The concave-convex condition of the object side surface or image side surface of each lens in the optical lens of Example 1 at the optical axis is shown in Table 1g.

[0125] Table 1g

[0126]

[0127] It should be noted that the "++," "+-," "-+," and "--" in Table 1g represent the concave-convex configuration of the object-side or image-side surfaces of each lens element at the optical axis. "++" indicates that both the object-side and image-side surfaces of the lens are convex toward the object at the optical axis. For example, lens L8 in Table 1g has a meniscus structure. "+-" indicates that both the object-side surface and the image-side surface of the lens are convex toward the object at the optical axis, i.e., a bi-convex structure. "-+" indicates that both the object-side surface and the image-side surface of the lens are concave toward the object at the optical axis, i.e., a bi-concave structure. "--" indicates that both the object-side and image-side surfaces of the lens are concave toward the object at the optical axis.

[0128] Of course, in addition to the above-mentioned concave and convex situations, each lens in the optical lens may also include any one or more of "∞+", "∞-", "-∞", "∞+" and "+∞", where the object side surface of the lens represented by "∞+" is a plane at the optical axis, and the image side surface is convex toward the object at the optical axis; the object side surface of the lens represented by "∞-" is a plane at the optical axis, and the image side surface is concave toward the object at the optical axis; the object side surface of the lens represented by "-∞" is concave toward the object at the optical axis, and the image side surface is a plane at the optical axis; the object side surface of the lens represented by "+∞" is convex toward the object at the optical axis, and the image side surface is a plane at the optical axis; no specific limitation is made here.

[0129] Combine Figure 1 The schematic diagram of the structure of the optical lens of Example 1 at infinity, and the main parameters of the optical lens of Example 1 given in Tables 1a to 1g satisfying the relationship in Table 1e, as well as the concave and convex conditions of each lens at the optical axis. The axial aberration diagram, field curvature diagram, and distortion diagram of the optical lens of Example 1 when focusing and imaging at infinity and the closest distance are obtained through simulation, as shown in FIG. Figures 2 to 4 As shown in the figure, the axial aberration diagram, field curvature diagram and distortion diagram simulation diagram of the optical lens at the closest point (376.45mm) are as follows: Figures 5 to 7 shown.

[0130] The above axial aberration diagram shows the axial aberration of the optical lens as the aperture changes. Among them, the three curves correspond to the axial aberration obtained under three different light wavelengths of 0.486um, 0.587um, and 0.656um. The horizontal axis represents the axial aberration value, and the vertical axis represents the normalized aperture.

[0131] The above field curvature graph shows the field curvature of an optical lens as it changes with field of view. The horizontal axis represents the field curvature magnitude, the vertical axis represents the normalized field height, the solid line represents the meridional direction, and the dashed line represents the sagittal direction. In the field of optical imaging, field curvature values within a field of view of 0.8 to 0.9 are typically used to judge the resolution of an optical lens.

[0132] The above distortion diagram shows the distortion percentage of the optical lens as the field of view changes, where the horizontal axis represents the distortion percentage and the vertical axis represents the normalized field of view height.

[0133] The above descriptions of the axial aberration diagram, the field curvature diagram, and the distortion diagram are the same as those in other embodiments and will not be repeated hereafter.

[0134] from Figure 2 and Figure 5 It can be seen that the axial chromatic aberration at the aperture of 0.707 is no more than 0.05mm, and the subject is not prone to dispersion. Figure 3 and Figure 6It can be seen that the absolute value of the field curvature in the 0.9 field of view is less than 0.2mm, indicating that the field curvature in both directions of the optical lens has been well corrected; Figure 4 and Figure 7 It can be seen that the distortion correction is excellent, with the maximum absolute value no higher than 4%, and the image is basically free of distortion; the overall resolution performance of the optical lens is excellent.

[0135] Figure 8 The diagram shows the structure of the optical lens of Example 2 when focused at infinity. The main differences between the optical lens of Example 2 and the optical lens of Example 1 are: the optical lens comprises 15 lenses, of which the third lens group G3 has one more lens than that of Example 1; and the parameters and conditions of each lens in the optical lens differ, as does the concave-convex shape of the object-side or image-side surface of each lens at the optical axis.

[0136] As shown in FIG8 , the optical lens comprises a first lens group G1, a second lens group G2, and a third lens group G3 arranged from the object side to the image side, a total of 15 lenses, and an aperture stop STOP located between the first lens group G1 and the second lens group G2. Specifically, the first lens group G1 and the third lens group G3 have positive refractive power, while the second lens group G2 has negative refractive power.

[0137] The first lens group G1 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7. The first lens L1 and the second lens L2 are cemented together to form a cemented lens.

[0138] The fourth lens L4 and the fifth lens L5 are cemented together to form a cemented lens; the second lens group G2 includes the eighth lens L8;

[0139] The third lens group G3 includes a ninth lens L9, a tenth lens L10, an eleventh lens L11, a twelfth lens L12, a thirteenth lens L13, a fourteenth lens L14, and a fifteenth lens L15. The tenth lens L10 and the eleventh lens L11 are cemented together to form a cemented lens; the twelfth lens L12 and the thirteenth lens L13 are cemented together to form a cemented lens; and the fourteenth lens L14 and the fifteenth lens L15 are cemented together to form a cemented lens. The focusing movement method of the optical lens in this embodiment is the same as that of the optical lens in Example 1 and will not be further described here.

[0140] Tables 2a to 2g respectively give the specific parameter values of each lens of the optical lens of an optional embodiment in Example 2 of the present application.

[0141] Table 2a

[0142] Surface number Surface type R-value thickness Refractive index Abbe number Physical Surface spherical surface flat D0 Side 1 spherical surface 2515.15 4.94 1.92 20.88 Surface 2 spherical surface -100.29 1.38 1.52 64.20 Surface 3 spherical surface 93.89 9.15 Surface 4 Aspheric 77.65 2.80 1.85 40.10 Side 5 Aspheric 77.18 6.19 Side 6 Spherical surface -52.05 1.30 1.81 22.76 Surface 7 spherical surface 50.00 9.12 1.73 54.68 Surface 8 spherical surface -88.07 0.15 Side 9 spherical surface 95.46 8.80 1.50 81.61 Face 10 spherical surface -68.33 0.15 Side 11 spherical surface 111.26 5.97 1.88 39.22 Face 12 spherical surface -148.53 0.88 aperture spherical surface flat D13 Surface 14 Aspheric 116.48 1.79 1.52 63.99 Surface 15 Aspheric 30.45 D15 Surface 16 spherical surface 125.89 4.72 1.95 17.94 Face 17 spherical surface -105.66 0.15 Face 18 spherical surface 70.33 6.12 1.76 52.32 Face 19 spherical surface -58.51 1.20 1.69 31.16 Surface 20 spherical surface 33.07 1.10 Surface 21 spherical surface 45.52 7.04 1.88 39.22 Surface 22 spherical surface -37.00 1.20 1.65 33.89 Surface 23 spherical surface 29.16 4.46 Face 24 spherical surface -98.78 5.24 1.50 81.61 Surface 25 spherical surface -23.72 1.20 1.85 23.78 Surface 26 spherical surface -60.83 18.32 Surface 28 spherical surface flat 2.00 1.52 64.20 Surface 29 spherical surface flat 0.50 Image plane spherical surface flat -

[0143] In this embodiment, when the optical lens is focused between infinity and the closest point, the values "D13" and "D15" at the thickness in Table 2a are variable parameters. Specifically, the above parameters "D13" and "D15" refer to Table 2b.

[0144] Table 2b

[0145] D0 (object distance) Infinity Closest focusing point (377.81mm) D13(mm) 0.84 8.49 D15(mm) 15.51 7.86

[0146] In the embodiment, the lenses at the 3rd and 8th positions from the object side to the image side, that is, in this embodiment, Figure 1 The third lens L3 and the eighth lens L8 in the image are aspherical lenses. That is, both the object-side and image-side surfaces of the third lens L3 and the eighth lens L8 are aspherical, as shown in "Surface 4," "Surface 5," "Surface 14," and "Surface 15" in Chart 1a. Using aspherical surfaces in these locations effectively reduces lens aberrations, particularly spherical aberration.

[0147] In the embodiment, surface 4, surface 5, surface 14 and surface 15 in Table 2a are aspherical surfaces. Table 2c below shows the conic coefficient and high-order aspherical coefficient of the aspherical lens of this embodiment.

[0148] Table 2c

[0149] Surface number k A4 A6 A8 Surface 4 0 -1.31E-06 -5.89E-09 -4.85E-11 Side 5 0 2.59E-06 -4.97E-09 -6.90E-11 Surface 14 0 -1.01E-06 -5.16E-09 -1.05E-10 Surface 1 5 0 7.12E-07 -6.79E-09 .7.19E-10 Surface number A10 A12 A14 A16 Surface 4 1.11E-14 8.77E-19 0 0 Side 5 4.46E-15 7.87E-18 0 0 Surface 14 -8.93E-15 -9.51E-19 0 0 Surface 15 3.07E-14 -5.05E-17 0 0

[0150] The optical parameters of the optical lens in Example 2 are shown in Table 2d below.

[0151] Table 2d

[0152] f Effective focal length when focusing at infinity (mm) 52.02 Fno aperture 1.25 w Half field of view angle when focusing at infinity (°) 22.76 H Half image height (mm) 21.60 TTL Total optical length (mm) 122.22 BFL Back focal length (mm) 20.82 <![CDATA[f G1 ]]> Focal length of the first lens group (mm) 49.19 <![CDATA[f G2 ]]> Focal length of the second lens group (mm) -80.50 <![CDATA[f G3 ]]> Focal length of the third lens group (mm) 91.08 S Focus shift of the second lens group 7.65 <![CDATA[OAL1]]> Length of the first lens group along the optical axis (mm) 49.95 <![CDATA[OAL3]]> Length of the third lens group along the optical axis (mm) 32.43

[0153] The parameters of the optical lens in Example 2 satisfy the relationship shown in Table 2e.

[0154] Table 2e

[0155] Relational S / f2 f2 / f3 OAL1 / f1 OAL3 / BFL Numerical -0.095 -0.884 1.015 1.558

[0156] The positive and negative conditions of the optical power of each lens in the optical lens of Example 2 are shown in Table 2f.

[0157] Table 2f

[0158]

[0159] The concave-convex condition of the object side surface or image side surface of each lens in the optical lens of Example 2 at the optical axis is shown in Table 2g.

[0160] Table 2g

[0161]

[0162] Combine Figure 8 The structural diagram of the optical lens in Example 2 is given, and the main parameters of the optical lens in Example 2 given in Tables 2a to 2g satisfy the relationship in Table 2e, as well as the concave and convex conditions of each lens at the optical axis.

[0163] The axial aberration diagram, field curvature diagram and distortion diagram of the optical lens of Example 2 when focusing and imaging at infinity and the closest distance are obtained through simulation, as shown in FIG. Figures 9 to 11 As shown in the figure, the axial aberration diagram, field curvature diagram and distortion diagram simulation diagram of the optical lens at the closest point (377.81mm) are as follows: Figures 12 to 14 shown.

[0164] from Figure 9 and Figure 12 It can be seen that the axial chromatic aberration at the aperture of 0.707 is no more than 0.07mm, and the subject is not prone to dispersion. Figure 10 and Figure 13 It can be seen that the absolute value of the field curvature in the 0.9 field of view is less than 0.12mm, indicating that the field curvature in both directions of the optical lens has been well corrected; Figure 11 and Figure 14 It can be seen that the distortion correction is excellent, with the maximum absolute value no higher than 2.5%, and the image is basically free of deformation; the overall resolution performance of the optical lens is excellent.

[0165] Figure 15 The structure of the optical lens of Example 3 is shown when focused at infinity. The main differences between the optical lens of Example 3 and the optical lens of Example 2 are: the parameters and conditions of each lens in this optical lens are different, and the concave-convex situation of the object side or image side of each lens at the optical axis.

[0166] As shown in Figure 15 , the optical lens includes a first lens group G1, a second lens group G2, and a third lens group G3 arranged from the object side to the image side, a total of 15 lenses, and an aperture stop STOP located between the first lens group G1 and the second lens group G2. The first lens group G1 and the third lens group G3 have positive refractive power, while the second lens group G2 has negative refractive power.

[0167] The first lens group G1 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7. The third lens L3 and the fourth lens L4 are cemented together to form a cemented lens; the fifth lens L5 and the sixth lens L6 are cemented together to form a cemented lens; the second lens group G2 includes an eighth lens L8; the third lens group G3 includes a ninth lens L9, a tenth lens L10, an eleventh lens L11, a twelfth lens L12, a thirteenth lens L13, a fourteenth lens L14, and a fifteenth lens L15. The ninth lens L9 and the tenth lens L10 are cemented together to form a cemented lens; the thirteenth lens L13 and the fourteenth lens L14 are cemented together to form a cemented lens.

[0168] The focusing movement method of the optical lens in this embodiment is the same as that of the optical lens in the first embodiment, and will not be repeated here.

[0169] Tables 3a to 3g respectively give the specific parameter values of each lens of the optical lens of an optional embodiment in Example 3 of the present application.

[0170] Table 3a

[0171] Surface number Surface type R-value thickness Refractive index Abbe number Physical Surface spherical surface flat D0 Side 1 spherical surface 66.59 6.31 1.92 20.88 Surface 2 spherical surface flat 1.44 Surface 3 Aspheric 84.65 2.79 1.69 53.20 Surface 4 Aspheric 30.17 9.07 Side 5 spherical surface -85.34 5.62 1.62 36.35 Side 6 spherical surface 46.21 9.28 1.50 81.61 Surface 7 spherical surface -50.28 0.84 Surface 8 spherical surface -43.22 1.84 1.85 23.78 Side 9 spherical surface 107.42 8.07 1.80 46.57 Face 10 spherical surface -57.41 0.15 Side 11 spherical surface 98.74 7.78 1.88 39.22 Face 12 spherical surface -76.13 0.50 aperture spherical surface flat D13 Surface 14 Aspheric 90.47 1.78 1.52 63.99 Surface 15 Aspheric 31.29 D15 Surface 16 spherical surface 70.58 10.03 1.73 54.68 Face 17 spherical surface -28.49 1.39 1.85 25.15 Face 18 spherical surface -52.84 0.13 Face 19 spherical surface -170.89 1.39 1.73 28.32 Surface 20 spherical surface 48.94 0.59 Surface 21 spherical surface 56.14 4.63 1.80 46.57 Surface 22 spherical surface -897.16 0.13 Surface 23 spherical surface 74.47 7.73 1.95 17.94 Surface 24 spherical surface -43.70 1.19 1.70 30.05 Surface 25 spherical surface 33.83 7.82 Surface 26 Aspheric -38.40 1.77 1.85 40.10 Surface 27 Aspheric -77.95 13.99 Surface 28 spherical surface flat 2.00 1.52 64.20 Surface 29 spherical surface flat 0.50 Image plane spherical surface flat

[0172] In this embodiment, when the optical lens is focused between infinity and the closest point, the values "D13" and "D15" at the thickness in Table 3a are variable parameters. Specifically, the above parameters "D13" and "D15" refer to Table 3b.

[0173] Table 3b

[0174] D0 (object distance) Infinity Closest focusing point (372.33mm) D13(mm) 0.54 10.67 D15(mm) 18.36 8.23

[0175] In this embodiment, the lenses at the 2nd, 8th and 15th positions along the object side to the image side, that is, in this embodiment, Figure 15 The second lens L2, the eighth lens L8 and the fifteenth lens L15 are aspherical lenses. That is, the object-side surface and the image-side surface of the second lens L2, the eighth lens L8 and the fifteenth lens L15 are all aspherical.

[0176] In the embodiment, surface 3, surface 4, surface 14, surface 15, surface 26 and surface 27 in Table 3a are aspherical surfaces. Table 3c below shows the conic coefficient and high-order aspherical coefficient of the aspherical lens of this embodiment.

[0177] Table 3c

[0178] Surface number k A4 A6 A8 Surface 3 0 5.30E-07 -2.08E-08 3.57E-11 Surface 4 0 6.14E-06 -1.91E-08 2.65E-11 Surface 14 0 -3.29E-06 1.03E-08 -4.26E-11 Surface 15 0 -2.47E-06 1.84E-09 -4.47E-11 Surface 26 0 -2.03E-06 5.68E-08 -8.52E-10 Surface 27 0 3.63E-06 3.95E-08 -3.53E-10 Surface number A10 A12 A14 A16 Surface 3 -3.73E-14 1.84E-17 0 0 Surface 4 -1.49E-14 -1.84E-17 0 0 Side 14 7.86E-14 -6.08E-17 0 0 Surface 15 8.71E-14 -8.87E-17 0 0 Surface 26 2.53E-12 -4.08E-15 0 0 Surface 27 1.57E-12 -2.38E-15 0 0

[0179] The optical parameters of the optical lens in this embodiment are shown in Table 3d below.

[0180] Table 3d

[0181] f Effective focal length when focusing at infinity (mm) 52.01 Fno aperture 1.25 w Half field of view angle when focusing at infinity (°) 22.66 H Half image height (mm) 21.60 TTL Total optical length (mm) 127.66 BFL Back focal length (mm) 16.49 <![CDATA[f G1 ]]> Focal length of the first lens group (mm) 54.21 <![CDATA[f G2 ]]> Focal length of the second lens group (mm) -93.70 <![CDATA[f G3 ]]> Focal length of the third lens group (mm) 90.77 S Focus shift of the second lens group 10.13 <![CDATA[OAL1]]> Length of the first lens group along the optical axis (mm) 53.19 <![CDATA[OAL3]]> Length of the third lens group along the optical axis (mm) 36.80

[0182] The parameters of the optical lens in Example 3 satisfy the relationship shown in Table 3e.

[0183] Table 3e

[0184] Relational S / f2 f2 / f3 OAL1 / f1 OAL3 / BFL Numerical -0.108 -1.032 0.981 2.232

[0185] The positive and negative conditions of the optical power of each lens in the optical lens of Example 3 are shown in Table 3f.

[0186] Table 3f

[0187]

[0188] The concave-convex condition of the object side surface or image side surface of each lens in the optical lens of Example 3 at the optical axis is shown in Table 3g.

[0189] Table 3g

[0190]

[0191] Combine Figure 15 The structural diagram of the optical lens in Example 3 is given, and the main parameters of the optical lens in Example 3 given in Tables 3a to 3g satisfy the relationship in Table 3e, as well as the concave and convex conditions of each lens at the optical axis.

[0192] The axial aberration diagram, field curvature diagram and distortion diagram of the optical lens of Example 3 when focusing and imaging at infinity and the closest distance are obtained through simulation, as shown in FIG. Figures 16 to 18 As shown in the figure, the axial aberration diagram, field curvature diagram and distortion diagram simulation diagram of the optical lens at the closest point (372.33mm) are as follows: Figures 19 to 21 shown.

[0193] from Figure 16 and Figure 19 It can be seen that the axial chromatic aberration at the aperture of 0.707 is no more than 0.08mm, and the subject is not prone to dispersion. Figure 17 and Figure 20 It can be seen that the absolute value of the field curvature in the 0.9 field of view is less than 0.06mm, indicating that the field curvature in both directions of the optical lens has been well corrected; Figure 18 and Figure 21 It can be seen that the distortion correction is excellent, with the maximum absolute value no higher than 3.5%, and the image is basically free of deformation; the overall resolution performance of the optical lens is excellent.

[0194] Figure 22The structure of the optical lens of Example 4 is shown when focused at infinity. The main differences between the optical lens of Example 4 and the optical lens of Example 2 are: the optical lens comprises 14 lenses, of which the number of lenses in the first lens group G1 is one less than that of Example 1; and the parameters and conditions of each lens in the optical lens are different, as well as the concave-convexity of the object-side surface or image-side surface of each lens at the optical axis.

[0195] As shown in FIG22 , the optical lens includes a first lens group G1, a second lens group G2, and a third lens group G3 arranged from the object side to the image side, a total of 14 lenses, and an aperture stop STOP located between the first lens group G1 and the second lens group G2. The first lens group G1 and the third lens group G3 have positive refractive power, while the second lens group G2 has negative refractive power.

[0196] The first lens group G1 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6. The fourth lens L4 and the fifth lens L5 are cemented together to form a cemented lens. The second lens group G2 includes a seventh lens L7. The third lens group G3 includes an eighth lens L8, a ninth lens L9, a tenth lens L10, an eleventh lens L11, a twelfth lens L12, a thirteenth lens L13, and a fourteenth lens L14. The ninth lens L9 and the tenth lens L10 are cemented together to form a cemented lens. The eleventh lens L11 and the twelfth lens L12 are cemented together to form a cemented lens. The thirteenth lens L13 and the fourteenth lens L14 are cemented together to form a cemented lens.

[0197] The focusing movement method of the optical lens in this embodiment is the same as that of the optical lens in the first embodiment, and will not be repeated here.

[0198] Tables 4a to 4g respectively give the specific parameter values of each lens of the optical lens of an optional embodiment in Example 4 of the present application.

[0199] In this embodiment, the lenses at the third and seventh positions from the object side to the image side, that is, in this embodiment, Figure 22 The third lens L3 and the seventh lens L7 are aspherical lenses. That is, both the object-side surface and the image-side surface of the third lens L3 and the seventh lens L7 are aspherical.

[0200] In the embodiment, surface 5, surface 6, surface 13 and surface 14 in Table 4a are aspherical surfaces. Table 4c below shows the conic coefficient and high-order aspherical coefficient of the aspherical lens of this embodiment.

[0201] Table 4a

[0202] Surface number Surface type R-value thickness Refractive index Abbe number Physical Surface spherical surface flat D0 Side 1 spherical surface -312.59 1.80 1.70 55.53 Side 2 spherical surface 163.38 3.00 Surface 3 spherical surface -280.43 3.40 1.68 55.52 Surface 4 spherical surface -76.59 0.15 Side 5 Aspheric 74.04 2.80 1.85 40.10 Side 6 Aspheric 78.24 8.00 Surface 7 spherical surface -38.73 1.20 1.72 29.50 Surface 8 spherical surface 64.03 11.77 1.79 47.49 Side 9 spherical surface -46.72 0.14 Face 10 spherical surface 61.33 8.62 1.59 68.34 Side 11 spherical surface -111.31 0.48 aperture spherical surface flat D12 Surface 13 Aspheric 105.93 1.78 1.52 63.99 Surface 14 Aspheric 32.37 D14 Surface 15 spherical surface 81.98 4.98 1.95 17.94 Surface 16 spherical surface -123.59 0.14 Face 17 spherical surface 118.65 5.84 1.76 52.32 Face 18 spherical surface -47.82 1.19 1.70 30.05 Face 19 spherical surface 31.65 1.11 Surface 20 spherical surface 39.60 8.48 1.88 39.22 Surface 21 spherical surface -39.52 1.19 1.70 30.05 Surface 22 spherical surface 30.69 3.88 Surface 23 spherical surface 406.61 7.21 1.50 81.61 Face 24 spherical surface -24.73 1.19 1.81 22.76 Surface 25 spherical surface -137.09 15.51 Surface 26 spherical surface flat 2.00 1.52 64.20 Surface 27 spherical surface flat 0.50 Image plane spherical surface flat -

[0203] In this embodiment, when the optical lens is focused between infinity and the closest point, the values "D12" and "D14" at the thickness in Table 4a are variable parameters. Specifically, the above parameters "D12" and "D14" refer to Table 4b.

[0204] Table 4b

[0205] D0 (object distance) Infinity Closest focusing point (386.19mm) D12(mm) 0.55 9.58 D14(mm) 16.71 7.68

[0206] Table 4c

[0207] Surface number k A4 A6 A8 Side 5 0 -2.89E-06 -1.88E-09 -4.85E-11 Side 6 0 1.80E-06 4.04E-09 -6.90E-11 Surface 13 0 7.61E-05 -1.52E-07 -1.05E-10 Surface 14 0 7.32E-05 -1.31E-07 -7.19E-10 Surface number A10 A12 A14 A16 Side 5 1.12E-13 -9.27E-17 0 0 Side 6 1.62E-13 -1.44E-16 0 0 Surface 13 1.41E-12 -2.47E-15 0 0 Surface 14 9.64E-13 -1.46E-15 0 0

[0208] The optical parameters of the optical lens in this embodiment are shown in Table 4d below.

[0209] Table 4d

[0210] f Effective focal length when focusing at infinity (mm) 52.09 Fno aperture 1.25 w Half field of view angle when focusing at infinity (°) 22.67 H Half image height (mm) 21.60 TTL Total optical length (mm) 113.62 BFL Back focal length (mm) 18.01 <![CDATA[f G1 ]]> Focal length of the first lens group (mm) 52.13 <![CDATA[f G2 ]]> Focal length of the second lens group (mm) -91.13 <![CDATA[f G3 ]]> Focal length of the third lens group (mm) 99.87 S The second lens group has a large focus position 9.03 <![CDATA[OAL1]]> Length of the first lens group along the optical axis (mm) 40.88 <![CDATA[OAL3]]> Length of the third lens group along the optical axis (mm) 35.21

[0211] The parameters of the optical lens in Example 4 satisfy the relationship shown in Table 4e.

[0212] Table 4e

[0213] Relational S / f2 f2 / f3 OAL1 / f1 OAL3 / BFL Numerical -0.099 -0.912 0.784 1.955

[0214] The positive and negative conditions of the optical power of each lens in the optical lens of Example 4 are shown in Table 4f.

[0215] Table 4f

[0216]

[0217] The concave-convex condition of the object side surface or image side surface of each lens in the optical lens of Example 4 at the optical axis is shown in Table 4g.

[0218] Table 4g

[0219]

[0220] Combine Figure 22 The schematic diagram of the structure of the optical lens in Example 4 is given, and the main parameters of the optical lens in Example 4 given in Tables 4a to 4g satisfy the relationship in Table 4e, as well as the concave and convex conditions of each lens at the optical axis. The axial aberration diagram, field curvature diagram, and distortion diagram of the optical lens in Example 4 when focusing at infinity and at the closest distance are obtained through simulation, as shown in FIG. Figures 23 to 25 As shown in the figure, the axial aberration diagram, field curvature diagram and distortion diagram simulation diagram of the optical lens at the closest point (386.19mm) are as follows: Figures 26 to 28 shown.

[0221] from Figure 23 and Figure 26It can be seen that the axial chromatic aberration at the aperture of 0.707 is no more than 1mm, and the subject is not prone to dispersion. Figure 24 and Figure 27 It can be seen that the absolute value of the field curvature in the 0.8 field of view is less than 0.05mm, indicating that the field curvature in both directions of the optical lens has been well corrected; Figure 25 and Figure 28 It can be seen that the distortion correction is excellent, with the maximum absolute value no higher than 3%, and the image is basically free of distortion; the overall resolution performance of the optical lens is excellent.

[0222] It should be noted that, in addition to the aforementioned 14 or 15, the number of lenses in the optical lens can be selected by the user based on optical requirements, and the number can also be 12, 13, or 16, without specific limitation herein. Furthermore, in addition to the two aforementioned embodiments, the number and placement of the aspheric lenses in the optical lens can also be appropriately adjusted based on optical requirements, without specific limitation herein.

[0223] Usually, the number of lenses in one of the first lens group G1 and the third lens group G3 is changed, which has little impact on the optical imaging quality of the optical lens and is more conducive to achieving the goal of balancing the performance and miniaturization of the optical lens.

[0224] In the above four embodiments, the displacement S of the second lens group on the optical axis when focusing at infinity and at the closest point and the focal length f2 of the second lens group satisfy the relationship: -1.13≤S / f2≤-0.08.

[0225] The displacement S of the second lens group on the optical axis when focusing at infinity and at the closest point is also called the focusing stroke S of the optical lens.

[0226] If the ratio S / f2 is too small, the focusing stroke S of the second lens group G2 will be excessively increased, thereby reducing the speed of the second lens group G2 when performing autofocus.

[0227] If the ratio S / f2 is too large, the focusing stroke S of the second lens group G2 will be reduced, thereby increasing the focusing speed of the second lens group G2 and achieving fast focusing. However, if the focusing stroke S of the second lens group G2 is too small, the precision requirement for the driving device used to drive the second lens group to move is relatively high, resulting in increased costs.

[0228] By properly selecting the above parameters, when S2 / f2 satisfies the above conditional expression, not only can the displacement S of the second lens group on the optical axis be controlled within an appropriate range, but the precision requirements of the driving device for driving the movement of the second lens group are also reduced. This allows the optical lens to quickly focus and produce clear images over a wide range of object distances, while achieving a lightweight optical lens and helping to control costs.

[0229] In the above four embodiments, the combined focal length f2 of the second lens group and the combined focal length f3 of the third lens group satisfy the relationship: -1.26≤f2 / f3≤-0.86.

[0230] If the ratio f2 / f3 is too small, the positive focal power of the third lens group G3 becomes stronger, and the coma generated in the third lens group G3 will be difficult to correct well. If the ratio f2 / f3 is too large, the negative focal power of the second lens group G2 becomes stronger, which makes it difficult to correct spherical aberration at different focusing positions.

[0231] By reasonably selecting the above parameters, when the ratio f2 / f3 satisfies the above relationship, changes in spherical aberration or coma caused by focusing can be effectively suppressed.

[0232] In the above four embodiments, the length of the first lens group G1 along the optical axis (i.e., the distance on the optical axis from the first lens surface closest to the object side in the first lens group G1, i.e., the object-side surface of the first lens L1, to the lens surface closest to the image side) OAL1 and the combined focal length f1 of the first lens group G1 satisfy the relationship: 0.75≤OAL1 / f1≤1.15.

[0233] If the ratio OAL1 / f1 is too small, the positive focal power of the first lens group G1 becomes smaller relative to its length, and its ability to refract light becomes weaker, which is not conducive to the mutual balance of aberrations with the subsequent lens groups, resulting in poor resolving power. If the ratio OAL1 / f1 is too large, the length of the first lens group G1 becomes longer relative to the combined focal length f1 of the first lens group G1, which makes it more difficult to compress the volume of the optical lens.

[0234] By reasonably selecting the above parameters, when the ratio OAL1 / f1 satisfies the above relationship, the optical lens can ensure that the length of the first lens group is within an appropriate range while better correcting aberrations such as spherical aberration, coma, and field curvature, thereby improving imaging quality. At the same time, the overall length of the optical lens can be effectively suppressed, ensuring the compact size requirement of the lens, that is, achieving a miniaturized design.

[0235] In the above four embodiments, the length OAL3 of the third lens group G3 in the optical axis direction and the back focal length BFL of the optical lens satisfy the relationship: 1.48≤OAL3 / BFL≤2.45.

[0236] If the ratio OAL3 / BFL is too small, the length of the third lens group G3 is too short. Although this is conducive to miniaturization of the optical lens, the third lens group G3 cannot fully balance the residual aberrations generated by the front lens group, resulting in a decrease in resolution.

[0237] If the ratio OAL3 / BFL is too large, the length of the third lens group G3 becomes too large, which is not conducive to compressing the total length of the optical lens, that is, not conducive to miniaturization of the optical lens.

[0238] By reasonably selecting the above parameters, when the ratio OAL3 / BFL satisfies the above relationship, the optical lens can better take into account the back focal length BFL while ensuring that the length of the third lens group G3 is within an appropriate range, thereby facilitating further improving the imaging quality of the optical lens and miniaturizing the design.

[0239] In summary, the optical lens in the embodiments of the present application achieves clear imaging across the full frame range between the closest point and infinity, while simultaneously achieving the goals of fast focus, lightweight design, and high image quality. The aforementioned optical lens and camera module can be mounted on a mobile device for video capture, enabling fast focus and achieving clear full-frame display.

[0240] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An optical lens, characterized in that: The optical lens comprises a plurality of lenses, wherein the optical lens comprises a first lens group, a second lens group, and a third lens group arranged from the object side to the image side, the first lens group and the third lens group have positive refractive power, and the second lens group has negative refractive power; The second lens group includes one lens, and the second lens group is movable along the optical axis of the optical lens so that the optical lens focuses and images between infinity and the closest point; The displacement S of the second lens group on the optical axis when focusing at infinity and at the closest point and the focal length f2 of the second lens group satisfy the relationship: -1.13≤S / f2≤-0.

08.

2. The optical lens according to claim 1, wherein: The combined focal length f2 of the second lens group and the combined focal length f3 of the third lens group satisfy the relationship: -1.26≤f2 / f3≤-0.

86.

3. The optical lens according to claim 1, wherein: The length OAL1 of the first lens group in the optical axis direction and the combined focal length f1 of the first lens group satisfy the relationship: 0.75≤OAL1 / f1≤1.

15.

4. The optical lens according to claim 1, wherein: The length OAL3 of the third lens group in the optical axis direction and the back focal length BFL of the optical lens satisfy the relationship: 1.48≤OAL3 / BFL≤2.

45.

5. The optical lens according to claim 1, wherein: The lens in the second lens group is a meniscus structure.

6. The optical lens according to any one of claims 1 to 5, wherein: The refractive index nd and the Abbe number Vd of the lenses in the second lens group G2 respectively satisfy the relationship: 1.43≤nd≤1.60; 65.4≤Vd≤94.

5.

7. The optical lens according to any one of claims 1 to 5, wherein: The number of the lenses is 12 to 16; And / or, among the multiple lenses in the optical lens, at least one lens is an aspherical lens.

8. The optical lens according to claim 7, wherein: The first lens group includes at least two lenses with negative optical power and three lenses with positive optical power; The third lens group includes at least three lenses with negative optical power and three lenses with positive optical power.

9. The optical lens according to claim 8, wherein: The first lens group includes at least one cemented lens; The third lens group includes at least one cemented lens; Wherein, the glued lens is mainly composed of 2 or 3 lenses.

10. A camera module, characterized in that: include: The optical lens according to any one of claims 1 to 9; A photosensitive element is arranged on the image side of the optical lens.

Images