Optical lens

Abstract

The embodiment of the utility model discloses an optical lens, which comprises a first lens group, a second lens group, a third lens group, a fourth lens group, a fifth lens group and a sixth lens group which are sequentially arranged from an object side to an image side, the second lens group has focal power and comprises a third lens, a fourth lens, a fifth lens and a sixth lens; the third lens group has focal power and comprises a seventh lens, an eighth lens and a ninth lens; the optical lens also comprises at least one spacing element, and the at least one spacing element comprises a fifth spacing element which is located between the fifth lens and the sixth lens and is in direct contact with the image side surface of the fifth lens; wherein the air interval T56 between the fifth lens and the sixth lens on the optical axis and the air interval T34 between the third lens and the fourth lens on the optical axis meet the following condition: 23.0 < T56 / T34 < 26.5; the combined focal length f45 of the fourth lens and the fifth lens, the outer diameter D5s of the object side surface of the fifth spacing element, and the inner diameter d5s of the object side surface of the fifth spacing element satisfy the following formula:-4.0 < f45 / (D5s-d5s) <-2.5.

Description

Technical Field

[0001] The present application relates to the field of optical elements, and in particular, to an optical lens comprising multiple lenses. Background Art

[0002] As people's living standards improve, they have higher and higher requirements for the quality of optical lenses in automotive lenses, security lenses and portable electronic products. Among them, with the rapid development of portable electronic products such as smart phones, mobile phone photography has also become an important activity in people's daily lives. The imaging quality of optical lenses has gradually become one of the important factors for users to choose electronic products. In order to meet people's diverse shooting needs, optical lenses are gradually developing in the direction of professional camera features such as longer focal lengths and optical zoom.

[0003] A zoom lens is an optical system that can continuously change the focal length within a certain range while keeping the image plane stationary. The focal length and / or magnification of the zoom lens can be changed by moving at least one lens or lens group in the zoom lens along the optical axis, thereby changing the position of the corresponding lens / lens group on the optical axis and / or changing the spacing between it and the adjacent lens / lens group. However, the overall length and lens height of the optical lens used in electronic products are limited, resulting in a short focal length of the telephoto lens, difficulty in optimizing stray light, and small movable space between lens groups, making it difficult to meet shooting requirements.

[0004] As mentioned above, current optical lenses often have at least one problem, such as unstable assembly and easy stray light. Therefore, how to optimize the structure of optical photography lenses to improve imaging quality has become a problem that needs to be solved urgently. Utility Model Content

[0005] An embodiment of the present application provides an optical lens, which includes: a first lens group with negative optical power, which includes a first lens and a second lens; a second lens group with optical power, which includes a third lens, a fourth lens, a fifth lens and a sixth lens; and a third lens group with optical power, which includes a seventh lens, an eighth lens and a ninth lens, which are arranged in sequence from the object side to the image side; the optical lens further includes at least one spacer element, and the at least one spacer element includes: a fifth spacer element located between the fifth lens and the sixth lens and directly in contact with the image side surface of the fifth lens; wherein an air gap T56 between the fifth lens and the sixth lens on the optical axis and an air gap T34 between the third lens and the fourth lens on the optical axis satisfy: 23.0<T56 / T34<26.5; a combined focal length f45 of the fourth lens and the fifth lens, an outer diameter D5s of the object side surface of the fifth spacer element, and an inner diameter d5s of the object side surface of the fifth spacer element satisfy: -4.0<f45 / (D5s-d5s)<-2.5.

[0006] In one or more embodiments, the optical lens comprises a first lens barrel, a second lens barrel and a third lens barrel, wherein the first lens group is located in the first lens barrel, the second lens group is located in the second lens barrel, and the third lens group is located in the third lens barrel.

[0007] In one or more embodiments, at least one spacer element also includes a first spacer element located between the first lens and the second lens and directly in contact with the image side of the first lens, and the effective focal length f1 of the first lens, the curvature radius R1 of the object side of the first lens, and the inner diameter d1s of the object side of the first spacer element satisfy: 2.9<f1 / R1+f1 / d1s<4.0.

[0008] In one or more embodiments, at least one spacer element also includes a first spacer element located between the first lens and the second lens and in direct contact with the image side of the first lens, and the effective focal length f2 of the second lens, the outer diameter D1m of the image side surface of the first spacer element, and the inner diameter d1m of the image side surface of the first spacer element satisfy: -13.0<f2 / (D1m-d1m)<-8.0.

[0009] The at least one spacer element also includes a third spacer element located between the third lens and the fourth lens and in direct contact with the image side of the third lens. The refractive index N4 of the fourth lens, the curvature radius R7 of the object side of the fourth lens, and the inner diameter d3m of the image side of the third spacer element satisfy: 2.5<(N4*R7) / d3m<3.0.

[0010] In one or more embodiments, at least one spacer element also includes a first spacer element located between the first lens and the second lens and in direct contact with the image side of the first lens, and the curvature radius R1 of the object side surface of the first lens, the curvature radius R4 of the image side surface of the second lens, the outer diameter D1s of the object side surface of the first spacer element, and the inner diameter d1s of the object side surface of the first spacer element satisfy: 1.0<(R1 / R4) / (D1s / d1s)<1.5.

[0011] In one or more embodiments, at least one spacer element also includes a seventh spacer element located between the seventh lens and the eighth lens and in direct contact with the image side of the seventh lens, the Abbe number V7 of the seventh lens, the effective focal length f7 of the seventh lens, and the object side outer diameter D7s of the seventh spacer element satisfy: -39.0<V7*f7 / D7s<-34.0.

[0012] In one or more embodiments, the refractive index N5 of the fifth lens, the curvature radius R9 of the object-side surface of the fifth lens, and the inner diameter d5s of the object-side surface of the fifth spacer element satisfy: -4.9<(N5*R9) / d5s<-4.3.

[0013] In one or more embodiments, at least one spacer element also includes an eighth spacer element located between the eighth lens and the ninth lens and in direct contact with the image side surface of the eighth lens, and the Abbe number V8 of the eighth lens, the effective focal length f8 of the eighth lens, and the outer diameter D8s of the object side surface of the eighth spacer element satisfy: 22.5<V8*f8 / D8s<27.5.

[0014] In one or more embodiments, at least one spacer element also includes a third spacer element located between the third lens and the fourth lens and in direct contact with the image side of the third lens, and a third auxiliary spacer element located between the third lens and the fourth lens and in direct contact with the image side of the third spacer element. The air gap T56 between the fifth lens and the sixth lens on the optical axis, the air gap T34 between the third lens and the fourth lens on the optical axis, the maximum thickness CP3 of the third spacer element, and the maximum thickness CP3b of the third auxiliary spacer element satisfy: 2.4<T56 / (T34+CP3b+CP3)<3.28.

[0015] In one or more embodiments, the maximum height L20 of the second lens, the center thickness CT3 of the third lens on the optical axis, and the center thickness CT6 of the sixth lens on the optical axis satisfy: 2.3<L20 / (CT3+CT6)<2.7.

[0016] In one or more embodiments, at least one spacer element also includes a third spacer element located between the third lens and the fourth lens and in direct contact with the image side of the third lens, the Abbe number V3 of the third lens, the Abbe number V4 of the fourth lens, the maximum thickness CP3 of the third spacer element, and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy: 6.5<(V3-V4)*CP3 / T34<11.6.

[0017] In one or more embodiments, the maximum height L10 of the first lens barrel, the combined focal length f12 of the first lens and the second lens, and the Abbe number V2 of the second lens satisfy: -1.3<f12 / (L10*V2)<-0.9.

[0018] In one or more embodiments, at least one spacer element also includes a seventh spacer element located between the seventh lens and the eighth lens and in direct contact with the image side of the seventh lens. The spacing EP307 between the front end surface of the third lens barrel and the seventh spacer element, and the center thickness CT7 of the seventh lens on the optical axis satisfy: 3.0<EP307 / CT7<4.0.

[0019] In one or more embodiments, at least one spacer element also includes an eighth spacer element located between the eighth lens and the ninth lens and in direct contact with the image side surface of the eighth lens, the effective focal length f9 of the ninth lens, the outer diameter D8m of the image side surface of the eighth spacer element, the curvature radius R18 of the image side surface of the ninth lens, and the center thickness CT9 of the ninth lens on the optical axis satisfy: -30.5<f9*D8m / (R18*CT9)<-23.0.

[0020] In one or more embodiments, the object side surface of the seventh lens is concave, and the image side surface is convex; the image side surface of the eighth lens is convex, and the curvature radius R13 of the object side surface of the seventh lens, the curvature radius R14 of the image side surface of the seventh lens, and the curvature radius R16 of the image side surface of the eighth lens satisfy: -5.5<(R13+R14) / R16<-2.0.

[0021] The embodiment of the present application provides an optical lens. In order to improve the resolution of the optical system and the reliability of the lens, stray light is easily generated between the fourth lens and the fifth lens and in the structure of the fifth lens. By controlling the ratio of the air spacing between the third lens and the fourth lens, and between the fifth lens and the sixth lens on the optical axis, the offset can be ensured to be small, so that the MTF (Modulation Transfer Function) curve is more concentrated, which is beneficial to improving the resolution of the optical system, and can also effectively avoid the problems of lens film scratches and lens cracks caused by lens falling, improve the reliability of the lens, and ensure the appearance quality; and for the problem that stray light is easily generated inside the lens, especially in the fourth lens and the fifth lens, at least one spacing element is provided, and by controlling the ratio between the combined focal length of the fourth lens and the fifth lens and the difference between the inner and outer diameters of the object side surface of the fifth spacing element, the problems of defocus, chromatic aberration and distortion caused by the air spacing can be effectively eliminated, and at the same time, the invalid light path of the light reflected at the subsequent lens is intercepted, which is beneficial to improving the optical performance, reducing the stray light spot, and improving the imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0023] Figure 1 A schematic diagram showing the structure and some parameters of an optical lens according to an embodiment of the present application is shown;

[0024] Figure 2 A schematic structural diagram of an optical lens according to Embodiment 1 of the present application is shown;

[0025] Figure 3 A schematic structural diagram of an optical lens according to Embodiment 2 of the present application is shown;

[0026] 4A to 4D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical lens corresponding to the magnification of 2X according to Example 1 and Example 2 of the present application are respectively shown;

[0027] Figure 5 A schematic structural diagram of an optical lens according to Embodiment 3 of the present application is shown;

[0028] Figure 6 A schematic structural diagram of an optical lens according to Embodiment 4 of the present application is shown;

[0029] 7A to 7D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical lens according to Example 3 and Example 4 of the present application when the magnification is 2X are respectively shown;

[0030] Figure 8 A schematic structural diagram of an optical lens according to Embodiment 5 of the present application is shown;

[0031] Fig. 9 A schematic structural diagram of an optical lens according to Embodiment 6 of the present application is shown;

[0032] FIG. 10A to FIG. 10D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical lens according to Example 5 and Example 6 of the present application when the magnification is 2X are respectively shown;

[0033] Fig.11 A schematic structural diagram of an optical lens according to Embodiment 7 of the present application is shown;

[0034] Fig.12 A schematic structural diagram of an optical lens according to Example 8 of the present application is shown;

[0035] FIG. 13A to FIG. 13D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical lens according to Example 7 and Example 8 of the present application when the magnification is 2X are respectively shown;

[0036] Fig.14 A schematic structural diagram of an optical lens according to Example 9 of the present application is shown;

[0037] Fig.15 A schematic structural diagram of an optical lens according to Embodiment 10 of the present application is shown;

[0038] FIG. 16A to FIG. 16D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical lens according to Example 9 and Example 10 of the present application when the magnification is 2X are respectively shown;

[0039] Fig.17A and 17B A schematic diagram showing the effect of eliminating stray light according to the optical lenses of Sample 1 and Sample 2 of the present application; and

[0040] Fig.18A and 18B A schematic diagram showing the effect of eliminating stray light by the optical lenses of Sample 1 and Sample 3 of the present application is shown. DETAILED DESCRIPTION

[0041] 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 exemplary 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.

[0042] 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 application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as those 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.

[0047] 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 following embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the present application. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. For example, the lens groups, lens barrel structures and spacer elements in the embodiments of the present application can be combined arbitrarily, and are not limited to the lens groups in one embodiment can only be combined with the lens barrel structure, spacer elements, etc. of the embodiment.

[0048] The features, principles and other aspects of the present application are described in detail below.

[0049] refer to Figure 1As shown, according to one aspect of the present application, an optical lens is provided, which may include: a first lens group with negative optical power, a second lens group with positive optical power, and a third lens group with negative optical power, which are arranged in sequence from the object side to the image side. As an exemplary embodiment, the three lens groups of the optical lens may be respectively used as a zoom group, a compensation group, a focus group, etc., and at least one of the three lens groups is moved along the optical axis, thereby changing the position of the corresponding lens group on the optical axis and / or changing the spacing distance between it and the adjacent lens group, etc., to achieve a change in the focal length and / or a change in the magnification of the optical lens. For example, the zoom of the optical lens may be achieved by moving the lens group as the zoom group on the optical axis, and the movement of the image plane position during the zoom process may be compensated by moving the lens group as the compensation group along the optical axis, thereby achieving mobile focus imaging of the optical lens.

[0050] In an exemplary embodiment, the first lens group may include a first lens and a second lens; the second lens group may include a third lens, a fourth lens, a fifth lens, and a sixth lens; the third lens group may include a seventh lens, an eighth lens, and a ninth lens. Any two adjacent lenses from the first lens to the ninth lens may have a spacing distance therebetween.

[0051] In an exemplary embodiment, the optical lens includes a first barrel, a second barrel, and a third barrel, wherein the first lens group is located in the first barrel, the second lens group is located in the second barrel, and the third lens group is located in the third barrel.

[0052] In an exemplary embodiment, the optical lens also includes at least one spacer element, for example, may include a fifth spacer element located between the fifth lens and the sixth lens and in direct contact with the image side of the fifth lens. Exemplarily, the fifth spacer element may abut against a non-optical area on the image side of the fifth lens.

[0053] According to an exemplary embodiment of the present application, at least one spacer element may further include any one or more of the following spacer elements: a first spacer element located between the first lens and the second lens and in direct contact with the image side of the first lens, a third spacer element located between the third lens and the fourth lens and in direct contact with the image side of the third lens, a third auxiliary spacer element located between the third lens and the fourth lens and in direct contact with the image side of the third spacer element, a fifth auxiliary spacer element located between the fifth lens and the sixth lens and in direct contact with the image side of the fifth spacer element, a seventh spacer element located between the seventh lens and the eighth lens and in direct contact with the image side of the seventh lens, an eighth spacer element located between the eighth lens and the ninth lens and in direct contact with the image side of the eighth lens, and an eighth auxiliary spacer element located between the eighth lens and the ninth lens and in direct contact with the image side of the eighth spacer element, etc. Exemplarily, the spacer element may include a spacer, a light shielding sheet, a spacer ring, or a pressure ring, etc. By reasonably setting the number, thickness, inner diameter, and outer diameter of the spacer element, it is helpful to block stray light, improve the imaging quality of the optical lens, and improve the assembly stability of the optical lens.

[0054] It should be understood that the surface of each spacer element closest to the object is called the object side surface of the spacer element, and the surface of each spacer element closest to the imaging surface is called the image side surface of the spacer element. The surface of the lens barrel closest to the object is called the object side end surface or the front end surface of the lens barrel, and the surface closest to the imaging surface is called the image side end surface or the rear end surface of the lens barrel.

[0055] Figure 1 Some parameters of the optical lens are shown in the figure. It should be understood by those skilled in the art that some parameters commonly used in the art, such as the center thickness CT1 of the first lens on the optical axis, are not shown in the figure. Figure 1 Only some parameters of the lens barrel and the spacer element of the optical lens are shown as examples to facilitate a better understanding of the present invention. Figure 1 As shown, L10 represents the maximum height of the first lens barrel, L20 represents the maximum height of the second lens barrel, CP3 represents the maximum thickness of the third spacer element, CP3b represents the maximum thickness of the third auxiliary spacer element, EP307 represents the interval between the front end surface of the third lens barrel and the seventh spacer element, D1s represents the outer diameter of the object side surface of the first spacer element, d1s represents the inner diameter of the object side surface of the first spacer element, D1m represents the outer diameter of the image side surface of the first spacer element, d1m represents the inner diameter of the image side surface of the first spacer element, d3m represents the inner diameter of the image side surface of the third spacer element, D5s represents the outer diameter of the object side surface of the fifth spacer element, d5s represents the inner diameter of the object side surface of the fifth spacer element, and so on.

[0056] In an exemplary embodiment, at least one lens group of the optical lens is moved along the optical axis to change the spacing between the lens groups, thereby changing the focal length of the optical lens, so that the optical lens forms a variety of different focus states, such as a wide-angle state or a telephoto state. When the optical lens changes between the wide-angle state and the telephoto state, a certain zoom ratio can be achieved, such as 2x, 3x, and 6x. In addition to satisfying a given zoom ratio and image plane position stability, the optical lens can also ensure good imaging quality at different focal length positions.

[0057] In an exemplary embodiment, the lenses of the optical lens can be glued together, and the use of glued lenses has at least one of the following advantages: reducing the air gap between the two lenses, reducing the total length of the system; reducing the assembly components between the lenses, reducing the process and reducing the cost; reducing the sensitivity of the lens unit to tolerances such as tilt / eccentricity generated during the assembly process, and improving the production yield; reducing the light loss caused by reflection between the lenses, and improving the illumination; further reducing the field curvature, and effectively correcting the off-axis point aberration of the system. Such a glued design shares the overall chromatic aberration correction of the system, effectively corrects the aberration to improve the resolution, and makes the overall optical system compact to meet the requirements of miniaturization.

[0058] In an exemplary embodiment, the fourth lens and the fifth lens can form a cemented lens, which can reduce the air space between the lenses, which is beneficial to limit the total optical length of the optical lens and realize the miniaturization of the lens; at the same time, the use of a cemented lens can fully correct various aberrations of the optical system, thereby achieving improved resolution, optimized distortion and other optical performance under the premise of a compact structure.

[0059] In an exemplary embodiment, the air interval T56 between the fifth lens and the sixth lens on the optical axis and the air interval T34 between the third lens and the fourth lens on the optical axis may satisfy: 23.0<T56 / T34<26.5; and the combined focal length f45 of the fourth lens and the fifth lens, the outer diameter D5s of the object side surface of the fifth spacer element, and the inner diameter d5s of the object side surface of the fifth spacer element may satisfy: -4.0<f45 / (D5s-d5s)<-2.5. By satisfying the conditional expression 23.0<T56 / T34<26.5, the offset can be ensured to be small, so that the MTF curve is more concentrated, which is conducive to improving the resolution of the optical system; and it can also effectively avoid problems such as lens film scratches and lens cracks caused by lens falling, improve the reliability of the lens, and ensure the appearance quality. However, this design will easily cause stray light between the fourth lens and the fifth lens, as well as in the structural part of the fifth lens, thus affecting the optical performance and imaging quality of the optical lens. By satisfying -4.0<f45 / (D5s-d5s)<-2.5, the problems of defocus, chromatic aberration and distortion caused by the air gap can be effectively eliminated, and at the same time, the invalid light path reflected by the cemented lens formed by the fourth lens and the fifth lens and its object side parts can be intercepted, which is beneficial to improving the optical performance, reducing the stray light spot and improving the imaging quality.

[0060] In an exemplary embodiment, the effective focal length f1 of the first lens, the curvature radius R1 of the object side of the first lens, and the inner diameter d1s of the object side of the first spacer element satisfy: 2.9<f1 / R1+f1 / d1s<4.0. Satisfying this conditional expression can effectively control the incident and refractive angles of external light entering the first lens, thereby reducing the size of the object side of the lens and reducing the weight of the lens. At the same time, by controlling the inner diameter of the object side of the first spacer element, the aperture number and RI (Relative Illumination) can be effectively guaranteed to be in the best state. In addition, the invalid light spot formed on the image plane after the light is reflected from the first lens mechanism surface can be effectively intercepted.

[0061] The effective focal length f2 of the second lens, the outer diameter D1m of the image side surface of the first spacing element, and the inner diameter d1m of the image side surface of the first spacing element satisfy: -13.0<f2 / (D1m-d1m)<-8.0. By satisfying this conditional expression, by controlling the difference between the inner and outer diameters of the image side surfaces of the second lens and the first spacing element within a certain range, the deformation problem of the spacing element after corrosion extinction can be effectively avoided, and at the same time, the thickness of the second lens can be effectively controlled to ensure that the air gap between the second lens and the front and rear lenses is within a certain range, which is conducive to reducing the difficulty of molding the second lens.

[0062] In an exemplary embodiment, the refractive index N4 of the fourth lens, the curvature radius R7 of the object side of the fourth lens, and the inner diameter d3m of the image side of the third spacer element satisfy: 2.5<(N4*R7) / d3m<3.0. Satisfying this conditional expression is conducive to reducing the difficulty of the bonding process of the fourth lens and the fifth lens, reducing the lens thickness, reducing the lens weight, and meeting the requirements of ultra-thin telephoto lenses. At the same time, by controlling the inner diameter of the image side of the third spacer element, the optical path of the main light of the optical system in the fourth lens can be effectively controlled to meet the requirements of a large image surface of the telephoto lens, thereby improving the imaging quality of the telephoto lens; at the same time, it is conducive to improving the assembly stability, improving the field curvature change of the lens, and improving the imaging clarity of the lens while optimizing the structure of the fourth lens.

[0063] In an exemplary embodiment, the radius of curvature R1 of the object side surface of the first lens, the radius of curvature R4 of the image side surface of the second lens, the outer diameter D1s of the object side surface of the first spacing element, and the inner diameter d1s of the object side surface of the first spacing element satisfy: 1.0<(R1 / R4) / (D1s / d1s)<1.5. Satisfying this conditional expression can effectively control the refraction angle of the system light in the first lens group and the maximum incident angle of the system light, which is beneficial to improving the external field illumination and the size of the imaging surface. At the same time, by controlling the inner and outer diameters of the first spacing element, it is beneficial to improve the stability of the lens assembly, improve the stray light state of the first lens group of the telephoto lens, and improve the imaging quality and reliability of the lens.

[0064] In an exemplary embodiment, the Abbe number V7 of the seventh lens, the effective focal length f7 of the seventh lens, and the outer diameter D7s of the object side surface of the seventh spacing element satisfy: -39.0<V7*f7 / D7s<-34.0. When this condition is satisfied, the thickness of the seventh lens can be effectively controlled, and the thickness of the lens can be reduced to the maximum extent while ensuring the strength of the lens, thereby reducing the weight of the lens, thereby reducing the weight and height of the third lens group of the lens, and meeting the requirements of ultra-thin telephoto lens. At the same time, the dispersion phenomenon of the seventh lens can be weakened, and the generation of stray light can be avoided by controlling the outer diameter of the object side surface of the seventh spacing element, thereby improving the imaging clarity of the lens.

[0065] In an exemplary embodiment, the refractive index N5 of the fifth lens, the curvature radius R9 of the object side surface of the fifth lens, and the inner diameter d5s of the object side surface of the fifth spacer element satisfy: -4.9<(N5*R9) / d5s<-4.3. This conditional expression is satisfied, and by controlling the refractive index of the fifth lens and the curvature radius of the object side surface, it is beneficial to reduce the edge thickness of the glass lens, and realize the ultra-thinness of the second lens group lens while reducing the weight of the lens. In addition, by controlling the inner diameter of the object side surface of the fifth spacer element, the invalid light path can be effectively intercepted, and the overlap length after assembly with the front and rear parts is guaranteed, thereby improving the assembly stability and imaging quality.

[0066] In an exemplary embodiment, the Abbe number V8 of the eighth lens, the effective focal length f8 of the eighth lens, and the outer diameter D8s of the object side of the eighth spacer element satisfy: 22.5<V8*f8 / D8s<27.5. Satisfying this conditional expression can effectively control the air gap between the eighth lens and its adjacent front and rear lenses, reduce the optical sensitivity of the lens, improve the stray light of the eighth lens while improving the optical quality; in addition, by controlling the outer diameter of the object side of the eighth spacer element, it is beneficial to ensure the uniformity of the thickness of the lens barrel of the third lens group, thereby ensuring the best roundness of the lens barrel, thereby improving the lens performance.

[0067] In an exemplary embodiment, the air interval T56 between the fifth lens and the sixth lens on the optical axis, the air interval T34 between the third lens and the fourth lens on the optical axis, the maximum thickness CP3 of the third spacer element, and the maximum thickness CP3b of the third auxiliary spacer element satisfy: 2.4<T56 / (T34+CP3b+CP3)<3.28. When this condition is satisfied, by controlling the thickness value of the third spacer element, it is beneficial to ensure the strength of the spacer element, avoid the situation that the spacer element is deformed due to the assembly pressure during assembly, thereby causing the performance to vary. At the same time, the optical sensitivity of the third spacer element is relatively large, and the field curvature can be adjusted by adjusting the thickness of the spacer element, thereby improving the resolution of the lens and the imaging quality of the lens.

[0068] In an exemplary embodiment, the maximum height L20 of the second lens, the center thickness CT3 of the third lens on the optical axis, and the center thickness CT6 of the sixth lens on the optical axis satisfy: 2.3<L20 / (CT3+CT6)<2.7. Satisfying this conditional expression can effectively control the center thickness of the third lens and the sixth lens on the optical axis, reduce the thickness ratio of the lens, thereby avoiding stray light and appearance problems caused by welding marks on the lens surface, and in addition, it is beneficial to reduce the lens height of the second lens group and increase the moving distance of the second lens group, thereby effectively reducing the height of the telephoto lens and improving the imaging quality of the lens.

[0069] In an exemplary embodiment, the Abbe number V3 of the third lens, the Abbe number V4 of the fourth lens, the maximum thickness CP3 of the third spacer element, and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy: 6.5<(V3-V4)*CP3 / T34<11.6. When this conditional expression is satisfied, the ratio is controlled within this range by reasonably allocating the refractive index and thickness of the third lens and the fourth lens, and the total weight of the lens can be reduced while effectively improving the imaging clarity of the lens. In addition, the air gap T34 between the third lens and the fourth lens on the optical axis is an optically sensitive position. Adjusting the thickness of the third spacer element is beneficial to improving the concentration of the MTF curve, improving the lens shooting clarity, and also beneficial to optimizing the lens structure and improving the imaging quality.

[0070] In an exemplary embodiment, the maximum height L10 of the first lens barrel, the combined focal length f12 of the first lens and the second lens, and the Abbe number V2 of the second lens satisfy: -1.3<f12 / (L10*V2)<-0.9. Satisfying this conditional expression is conducive to achieving the requirement of a large image surface of a telephoto lens, and at the same time, the thickness of the second lens can be effectively controlled to avoid problems such as reliability, appearance, and stray light caused by excessively thin center thickness and excessively thick edge thickness, and is conducive to controlling the height of the first lens group lens barrel to achieve the requirement of ultra-thin telephoto lens.

[0071] In an exemplary embodiment, the interval EP307 between the front end face of the third lens barrel and the seventh spacing element and the center thickness CT7 of the seventh lens on the optical axis satisfy: 3.0<EP307 / CT7<4.0. This conditional expression is satisfied, and by controlling the ratio within a certain range, the thickness between the front end face of the third lens barrel and the object side of the seventh lens and the edge thickness of the seventh lens can be effectively allocated, and the performance variation caused by the change in the flatness of the lens barrel on the object side of the seventh lens caused by the pressure during the assembly of the seventh lens can be effectively avoided. At the same time, it is beneficial to reduce the thickness ratio of the seventh lens, avoid the appearance and stray light problems caused by its excessive value, and effectively improve the comprehensive yield of the lens.

[0072] In an exemplary embodiment, the effective focal length f9 of the ninth lens, the outer diameter D8m of the image side surface of the eighth spacing element, the curvature radius R18 of the image side surface of the ninth lens, and the center thickness CT9 of the ninth lens on the optical axis satisfy: -30.5<f9*D8m / (R18*CT9)<-23.0. Satisfying this conditional expression is conducive to increasing the center thickness of the ninth lens, reducing the ratio of its edge thickness to its center thickness on the optical axis, and effectively avoiding the appearance and stray light problems caused by injection molding of the ninth lens; at the same time, by controlling the curvature radius of the image side surface of the ninth lens, the arc stray light generated by the reflection of light between the color filter and the ninth lens can be effectively controlled, and the imaging clarity of the lens can be improved; in addition, by controlling the outer diameter of the image side surface of the eighth spacing element, it is conducive to controlling the outer shape of the third lens barrel and the ratio of the outer diameter to the center thickness of the ninth lens within a certain range, and the radial height of the telephoto lens can be effectively reduced.

[0073] In an exemplary embodiment, the object side surface of the seventh lens is concave, and the image side surface is convex; the image side surface of the eighth lens is convex, and the curvature radius R13 of the object side surface of the seventh lens, the curvature radius R14 of the image side surface of the seventh lens, and the curvature radius R16 of the image side surface of the eighth lens satisfy: -5.5<(R13+R14) / R16<-2.0. By reasonably matching the object side surface and image side surface of the seventh lens with the image side surface of the eighth lens, and satisfying this conditional expression, it is helpful to ensure that distant objects can be captured more clearly in the picture. At the same time, by controlling the ratio of the sum of the curvature radii of the object side surface and the image side surface of the seventh lens to the curvature radius of the image side surface of the eighth lens within a certain range, the sensitivity of the image side group lens can be effectively reduced, and the imaging stability of the lens can be improved.

[0074] It should be understood that the present application does not specifically limit the number of spacer elements, and any number of spacer elements may be included between any two lenses, and the entire optical lens may also include any number of spacer elements. The spacer element helps the optical lens intercept excess refractive and reflective light paths and reduce stray light and ghosting. Adding auxiliary support between the spacer element and the lens barrel is helpful to improve the problems of poor assembly stability and low performance yield caused by large step differences between lenses.

[0075] According to the second aspect of the present application, an optical lens is also provided, which includes: a first lens group with negative optical power, a second lens group with optical power, and a third lens group with optical power, which can be arranged in sequence from the object side to the image side. The first lens group is located in the first lens barrel and includes the first lens and the second lens; the second lens group is located in the second lens barrel and includes the third lens, the fourth lens, the fifth lens, and the sixth lens; the third lens group is located in the third lens barrel and includes the seventh lens, the eighth lens, and the ninth lens.

[0076] The optical lens also includes at least one spacer element, which may include a first spacer element located between the first lens and the second lens and in direct contact with the image side of the first lens. Exemplarily, the first spacer element may abut against a non-optical region of the image side of the first lens.

[0077] In an exemplary embodiment, the radius of curvature R1 of the object side surface of the first lens, the radius of curvature R4 of the image side surface of the second lens, the outer diameter D1s of the object side surface of the first spacing element, and the inner diameter d1s of the object side surface of the first spacing element satisfy: 1.0<(R1 / R4) / (D1s / d1s)<1.5. Satisfying this conditional expression can effectively control the refraction angle of the system light in the first lens group and the maximum incident angle of the system light, which is beneficial to improving the external field illumination and the size of the imaging surface. At the same time, by controlling the inner and outer diameters of the first spacing element, it is beneficial to improve the stability of the lens assembly, improve the stray light state of the first lens group of the telephoto lens, and improve the imaging quality and reliability of the lens.

[0078] According to the third aspect of the present application, an optical lens is also provided, which includes: a first lens group with negative optical power, a second lens group with optical power, and a third lens group with optical power, which can be arranged in sequence from the object side to the image side. The first lens group is located in the first lens barrel and includes the first lens and the second lens; the second lens group is located in the second lens barrel and includes the third lens, the fourth lens, the fifth lens, and the sixth lens; the third lens group is located in the third lens barrel and includes the seventh lens, the eighth lens, and the ninth lens.

[0079] The optical lens further includes at least one spacer element, which may include an eighth spacer element located between the eighth lens and the ninth lens and in direct contact with the image side of the eighth lens. Exemplarily, the eighth spacer element may abut against a non-optical region on the image side of the eighth lens.

[0080] In an exemplary embodiment, the Abbe number V8 of the eighth lens, the effective focal length f8 of the eighth lens, and the outer diameter D8s of the object side surface of the eighth spacing element satisfy: 22.5<V8*f8 / D8s<27.5. When this conditional expression is satisfied, the air gap between the eighth lens and its adjacent front and rear lenses can be effectively controlled to reduce the optical sensitivity of the lens; in addition, by controlling the outer diameter of the object side surface of the eighth spacing element, it is beneficial to ensure the uniformity of the thickness of the lens barrel of the third lens group, thereby ensuring the best roundness of the lens barrel, thereby improving the lens performance.

[0081] According to a fourth aspect of the present application, an optical lens is also provided, the optical lens comprising: a first lens group with negative optical power, a second lens group with optical power, and a third lens group with optical power, which can be arranged in sequence from the object side to the image side. The first lens group is located in the first lens barrel, and includes the first lens and the second lens; the second lens group is located in the second lens barrel, and includes the third lens, the fourth lens, the fifth lens, and the sixth lens; the third lens group is located in the third lens barrel, and includes the seventh lens, the eighth lens, and the ninth lens.

[0082] The optical lens further includes at least one spacer element, which may include a third spacer element located between the third lens and the fourth lens and in direct contact with the image side of the third lens. Exemplarily, the third spacer element may abut against a non-optical region on the image side of the third lens.

[0083] In an exemplary embodiment, the Abbe number V3 of the third lens, the Abbe number V4 of the fourth lens, the maximum thickness CP3 of the third spacer element, and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy: 6.5<(V3-V4)*CP3 / T34<11.6. When this conditional expression is satisfied, the ratio is controlled within this range by reasonably allocating the refractive index and thickness of the third lens and the fourth lens, and the total weight of the lens can be reduced while effectively improving the imaging clarity of the lens. In addition, the air gap T34 between the third lens and the fourth lens on the optical axis is an optically sensitive position, and adjusting the thickness of the third spacer element is beneficial to improving the concentration of the MTF curve and improving the shooting clarity of the lens.

[0084] In some embodiments, the optical lens according to the present application may further include a filter and / or protective glass disposed between the ninth lens and the imaging surface, for filtering light with different wavelengths, correcting color deviation, and protecting the photosensitive element located on the imaging surface.

[0085] In some embodiments, the optical lens according to the present application may further include an aperture disposed between the third lens and the fourth lens. The provision of the aperture is conducive to effectively converging the light entering the optical lens and is conducive to reducing the aperture of the lens.

[0086] According to the optical lens of the above embodiment of the present application, it can use multiple lenses, such as the nine lenses described above. By reasonably allocating the focal length, surface shape, center thickness of each lens, and the on-axis spacing between each lens, etc., the incident light can be effectively converged, the total optical length can be reduced, and the processability can be improved, making the optical lens more conducive to production and processing.

[0087] In an embodiment of the present application, at least one of the mirror surfaces of each lens in the first lens to the ninth lens is an aspherical mirror surface. The characteristic of an aspherical lens is that the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting an aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, the object side surface and the image side surface of each lens in the first lens to the ninth lens are aspherical mirror surfaces.

[0088] Embodiments 1 to 10 of the optical lens applicable to the above exemplary embodiment will be further described below with reference to the accompanying drawings.

[0089] Example 1

[0090] The following reference Figure 2 An optical lens according to Example 1 of the present application is described. Figure 2 The schematic diagram of the structure of the optical lens of Example 1 corresponding to the magnification of 2X is shown.

[0091] like Figure 2 As shown, the optical lens comprises: a first lens group with negative optical power, a second lens group with optical power, and a third lens group with optical power, which are arranged in sequence from the object side to the image side along the optical axis.

[0092] In this embodiment, the first lens group includes a first lens E1 and a second lens E2 located in the first lens barrel P10; the second lens group includes a third lens E3, an aperture STO, a fourth lens E4, a fifth lens E5 and a sixth lens E6 located in the second lens barrel P20; the third lens group includes a seventh lens E7, an eighth lens E8 and a ninth lens E9 located in the third lens barrel P30.

[0093] In this embodiment, the optical lens further includes at least one spacing element, wherein the at least one spacing element includes: a first spacing element P1, a third spacing element P3, a third auxiliary spacing element P3b, a fifth spacing element P5, a fifth auxiliary spacing element P5b, a seventh spacing element P7, an eighth spacing element P8, and an eighth auxiliary spacing element P8b. The spacing element can block stray light in the imaging process from entering the next lens, and at the same time, the lens and the lens barrel can be better supported, thereby enhancing the structural stability of the optical lens.

[0094] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is convex. The second lens E2 has negative focal power, and its object side surface S3 is concave, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 and the fifth lens E5 form a doublet lens, the fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is convex, and the fifth lens E5 has negative focal power, and its object side surface S8 is concave, and its image side surface S9 is concave. The sixth lens E6 has positive focal power, and its object side surface S10 is convex, and its image side surface S11 is convex. The seventh lens E7 has negative focal power, and its object side surface S12 is concave, and its image side surface S13 is concave. The eighth lens E8 has positive focal power, and its object side surface S14 is convex, and its image side surface S15 is convex. The ninth lens E9 has negative refractive power, its object-side surface S16 is convex, and its image-side surface S17 is concave. Light from the object passes through the surfaces S1 to S17 in sequence and is finally imaged on an imaging surface S18 (not shown in the figure).

[0095] Table 1 shows the basic parameters of the optical lens of Example 1, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0096]

[0097] Table 1

[0098] In Example 1, the object-side surface and the image-side surface of the first lens E1, the second lens E2, the third lens E3, the sixth lens E6, the seventh lens E7, the eighth lens E8 and the ninth lens E9 are all aspherical surfaces, and the surface shape x of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0099]

[0100] Among them, x is the distance vector height from the vertex of the aspherical surface when the aspherical surface is at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (that is, the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order aspherical surface.

[0101] The following Tables 2-1 and 2-2 give the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28and A 30 .

[0102] Face number A4 A6 A8 A10 A12 A14 A16 S1 1.8558E-02 4.6483E-03 9.2886E-06 -2.6511E-04 -7.5602E-05 -1.9396E-05 -9.9244E-08 S2 2.0206E-01 -1.9679E-02 2.6393E-03 -7.9996E-04 1.9257E-04 -2.1803E-05 8.7300E-06 S3 5.7697E-02 -1.0507E-02 2.3279E-03 -3.7130E-04 2.2249E-04 -4.0906E-05 9.8992E-06 S4 -1.4706E-01 5.9958E-03 -2.2559E-04 1.2537E-04 1.9601E-05 -2.0194E-05 -8.9653E-08 S5 -4.9718E-02 -7.6666E-04 3.5415E-04 1.6256E-04 7.5437E-05 3.1421E-05 1.2283E-05 S6 3.7470E-02 2.7274E-04 2.9013E-04 7.8430E-05 3.4466E-05 1.5235E-05 5.4812E-06 S10 -1.7586E-02 -9.7040E-04 2.6960E-04 1.3457E-05 -1.5062E-05 -3.3173E-06 8.3268E-07 S11 -1.7255E-02 -3.7293E-03 1.8178E-05 6.6604E-06 -1.2355E-05 -7.1985E-07 3.7323E-07 S12 6.0893E-01 -5.9367E-02 8.6344E-03 -1.9933E-03 4.9189E-04 8.1070E-05 -5.5643E-05 S13 4.7297E-01 -3.5024E-02 6.1807E-03 -1.7399E-03 3.3854E-04 3.3575E-04 -4.3279E-05 S14 -4.8322E-01 1.5726E-02 3.9778E-03 4.4602E-05 -1.2171E-03 1.1151E-04 1.7303E-05 S15 -4.3206E-01 1.2089E-02 6.9110E-03 3.5284E-03 -1.3013E-03 1.5192E-04 -2.5866E-04 S16 -1.6014E+00 2.4731E-01 -4.9974E-02 2.0642E-02 -3.8691E-03 1.6553E-03 -5.0340E-04 S17 -2.6598E+00 4.2408E-01 -1.3312E-01 4.3810E-02 -1.2758E-02 5.6769E-03 -2.1406E-03

[0103] Table 2-1

[0104] Face number A18 A20 A22 A24 A26 A28 A30 S1 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S10 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S11 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S12 -2.9064E-08 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S13 -6.6553E-07 -2.5524E-08 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S14 1.1023E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S15 -1.2264E-05 -8.5150E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S16 1.9599E-04 9.7558E-05 -1.1590E-05 -3.8021E-06 -4.9248E-08 0.0000E+00 0.0000E+00 S17 1.0056E-03 7.7009E-05 3.0757E-04 7.2381E-05 0.0000E+00 0.0000E+00 0.0000E+00

[0105] Table 2-2

[0106] Table 3 shows the parameters and zoom data of the optical lens of this embodiment corresponding to different magnifications.

[0107]

[0108]

[0109] Table 3

[0110] Figure 4A The axial chromatic aberration curve of the optical lens of Example 1 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 4B The astigmatism curve of the optical lens of Example 1 is shown, which indicates the meridional field curvature and the sagittal field curvature. Figure 4C The distortion curve of the optical lens of Example 1 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 4D The chromatic aberration curve of the optical lens of Example 1 is shown, which indicates the deviation of different image heights on the imaging surface after the light passes through the lens. 4A to 4D It can be seen that the optical lens provided in Example 1 can achieve good imaging quality.

[0111] Example 2

[0112] The following reference Figure 3 Describe the optical lens according to Example 2 of the present application. Figure 3 The structure diagram of the optical lens of Example 2 corresponding to the magnification of 2X is shown. In this embodiment, for the sake of brevity, some descriptions similar to those of Example 1 will be omitted.

[0113] like Figure 3 As shown, the optical lens comprises: a first lens group with negative optical power, a second lens group with optical power, and a third lens group with optical power, which are arranged in sequence from the object side to the image side along the optical axis.

[0114] The parameters such as the radius of curvature, center thickness, etc. of each lens of the optical lens of this embodiment and embodiment 1, as well as the spacing distance between lenses and high-order coefficients are the same, as shown in Table 1, Table 2-1, Table 2-2 and Table 3. In addition, the optical lens of this embodiment and embodiment 1 include the same number of lens barrels and spacing elements, and the only difference is that the actual parameters of the lens barrel and each spacing element are different, for example, at least one of the parameters such as the lens barrel size, the thickness of the spacing element, the inner diameter of the spacing element, the outer diameter of the spacing element, and the spacing distance between the spacing elements is different. In other words, the main structure for imaging is the same, while the auxiliary structure for imaging is different. Therefore, the imaging quality of the optical lens of embodiment 2 of the present application is as follows: 4A to 4D shown.

[0115] Example 3

[0116] The following reference Figure 5 Describe the optical lens according to Example 3 of the present application. Figure 5 The schematic diagram of the structure of the optical lens of Example 3 corresponding to the magnification of 2X is shown.

[0117] like Figure 5 As shown, the optical lens comprises: a first lens group with negative optical power, a second lens group with optical power, and a third lens group with optical power, which are arranged in sequence from the object side to the image side along the optical axis.

[0118] In this embodiment, the first lens group includes a first lens E1 and a second lens E2 located in the first lens barrel P10; the second lens group includes a third lens E3, an aperture STO, a fourth lens E4, a fifth lens E5 and a sixth lens E6 located in the second lens barrel P20; the third lens group includes a seventh lens E7, an eighth lens E8 and a ninth lens E9 located in the third lens barrel P30.

[0119] In this embodiment, the optical lens also includes at least one spacing element, wherein the at least one spacing element includes: a first spacing element P1, a third spacing element P3, a third auxiliary spacing element P3b, a fifth spacing element P5, a fifth auxiliary spacing element P5b, a seventh spacing element P7, an eighth spacing element P8 and an eighth auxiliary spacing element P8b.

[0120] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is convex. The second lens E2 has negative focal power, and its object side surface S3 is concave, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 and the fifth lens E5 form a doublet lens, the fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is convex, and the fifth lens E5 has negative focal power, and its object side surface S8 is concave, and its image side surface S9 is concave. The sixth lens E6 has positive focal power, and its object side surface S10 is convex, and its image side surface S11 is convex. The seventh lens E7 has negative focal power, and its object side surface S12 is concave, and its image side surface S13 is concave. The eighth lens E8 has positive focal power, and its object side surface S14 is convex, and its image side surface S15 is convex. The ninth lens E9 has negative refractive power, and its object-side surface S16 is convex, and its image-side surface S17 is concave. Light from the object passes through the surfaces S1 to S17 in sequence and is finally imaged on the imaging surface S18.

[0121] Table 4 shows the basic parameter table of the optical lens of Example 3, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0122]

[0123] Table 4

[0124] In this embodiment, the object-side surface and the image-side surface of the first lens E1, the second lens E2, the third lens E3, the sixth lens E6, the seventh lens E7, the eighth lens E8 and the ninth lens E9 are all aspherical surfaces, and the surface shape x of each aspherical lens can be defined by, but not limited to, the formula (1) given in the aforementioned embodiment 1.

[0125] Tables 5-1 and 5-2 below give the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0126] Face number A4 A6 A8 A10 A12 A14 A16 S1 2.6623E-02 4.1300E-03 -1.6657E-04 -2.9377E-04 -6.9403E-05 -1.6202E-05 9.7833E-07 S2 2.0232E-01 -1.8928E-02 2.3322E-03 -7.4329E-04 1.6905E-04 -1.2609E-05 6.0938E-06 S3 5.3906E-02 -1.0339E-02 2.3996E-03 -4.1036E-04 2.1993E-04 -3.6416E-05 7.5964E-06 S4 -1.4015E-01 5.6668E-03 2.4244E-05 4.8421E-05 3.7113E-05 -2.1050E-05 1.3609E-06 S5 -5.2236E-02 -9.0631E-04 4.0427E-04 1.9949E-04 9.0078E-05 3.7435E-05 1.3185E-05 S6 4.0320E-02 2.5865E-04 3.4709E-04 1.0112E-04 4.1977E-05 1.8296E-05 5.4271E-06 S10 -1.1678E-02 -1.2950E-03 2.4500E-04 3.3431E-05 3.7252E-06 -2.2972E-06 -1.3061E-06 S11 -2.1970E-02 -4.7676E-03 -8.0295E-05 1.1382E-05 6.9774E-06 4.1715E-06 -1.8741E-06 S12 6.1417E-01 -5.8896E-02 8.6346E-03 -2.1721E-03 6.7090E-04 -2.1954E-06 -6.6138E-05 S13 4.8549E-01 -3.6533E-02 7.1793E-03 -2.2888E-03 6.6307E-04 2.5644E-04 -3.7030E-05 S14 -3.8995E-01 -6.9095E-04 8.2257E-03 -1.1034E-03 -8.5955E-04 -2.0201E-06 8.1693E-05 S15 -3.9214E-01 1.3730E-02 5.0941E-03 4.2230E-03 -1.5006E-03 3.4860E-04 -2.9560E-04 S16 -1.9496E+00 3.1222E-01 -6.4929E-02 2.4362E-02 -4.2448E-03 1.9410E-03 -5.9270E-04 S17 -3.1587E+00 5.2085E-01 -1.6112E-01 5.2433E-02 -1.5051E-02 6.4691E-03 -2.5505E-03

[0127] Table 5-1

[0128] Face number A18 A20 A22 A24 A26 A28 A30 S1 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S10 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S11 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S12 -2.9499E-08 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S13 -5.8096E-07 -2.4753E-08 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S14 3.8830E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S15 -1.3023E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S16 1.4475E-04 1.5751E-04 -7.2892E-06 5.2547E-06 3.6098E-07 0.0000E+00 0.0000E+00 S17 1.1384E-03 1.5186E-04 3.7959E-04 1.1494E-04 0.0000E+00 0.0000E+00 0.0000E+00

[0129] Table 5-2

[0130] Table 6 shows the parameters and zoom data of the optical lens of this embodiment corresponding to different magnifications.

[0131] Parameters / Magnification 2X 3X 6X Semi-FOV(°) 19.7989 14.2818 10.2040 f / EPD 2.0365 2.3797 2.6926 f(mm) 14.1998 16.8729 19.7459 ImgH(mm) 5.2601 4.4042 3.6273 T1(mm) 7.6121 5.2121 0.5000 T2(mm) 2.5000 1.3000 0.5000 T3(mm) 1.3345 3.4570 5.3676

[0132] Table 6

[0133] Fig. 7A The axial chromatic aberration curve of the optical lens of Example 3 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 7B The astigmatism curve of the optical lens of Example 3 is shown, which indicates the meridional field curvature and the sagittal field curvature. Figure 7C The distortion curve of the optical lens of Example 3 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.7D The magnification chromatic aberration curve of the optical lens of Example 3 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. 7A to 7D It can be seen that the optical lens provided in Example 3 can achieve good imaging quality.

[0134] Example 4

[0135] The following reference Figure 6 Describe the optical lens according to Example 4 of the present application. Figure 6 The structure diagram of the optical lens of Example 4 corresponding to the magnification of 2X is shown. In this embodiment, for the sake of brevity, some descriptions similar to those of Example 3 are omitted.

[0136] like Figure 6 As shown, the optical lens comprises: a first lens group with negative optical power, a second lens group with optical power, and a third lens group with optical power, which are arranged in sequence from the object side to the image side along the optical axis.

[0137] The parameters such as the radius of curvature, center thickness, etc. of each lens of the optical lens of this embodiment and embodiment 3, as well as the spacing distance between lenses and high-order coefficients are the same, as shown in Table 4, Table 5-1, Table 5-2 and Table 6. In addition, the optical lens of this embodiment and embodiment 3 include the same number of lens barrels and spacing elements, and the only difference is that the actual parameters of the lens barrel and each spacing element are different, for example, at least one of the parameters such as the lens barrel size, the thickness of the spacing element, the inner diameter of the spacing element, the outer diameter of the spacing element, and the spacing distance between the spacing elements is different. In other words, the main structure for imaging is the same, while the auxiliary structure for imaging is different. Therefore, the imaging quality of the optical lens of embodiment 4 of the present application is as follows: 7A to 7D shown.

[0138] Example 5

[0139] The following reference Figure 8 Describe the optical lens according to Example 5 of the present application. Figure 8 A schematic diagram of the structure of the optical lens of Example 5 corresponding to a magnification of 2X is shown.

[0140] like Figure 8 As shown, the optical lens comprises: a first lens group with negative optical power, a second lens group with optical power, and a third lens group with optical power, which are arranged in sequence from the object side to the image side along the optical axis.

[0141] In this embodiment, the first lens group includes a first lens E1 and a second lens E2 located in the first lens barrel P10; the second lens group includes a third lens E3, an aperture STO, a fourth lens E4, a fifth lens E5 and a sixth lens E6 located in the second lens barrel P20; the third lens group includes a seventh lens E7, an eighth lens E8 and a ninth lens E9 located in the third lens barrel P30.

[0142] In this embodiment, the optical lens also includes at least one spacing element, wherein the at least one spacing element includes: a first spacing element P1, a third spacing element P3, a third auxiliary spacing element P3b, a fifth spacing element P5, a fifth auxiliary spacing element P5b, a seventh spacing element P7, an eighth spacing element P8 and an eighth auxiliary spacing element P8b.

[0143] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 and the fifth lens E5 form a doublet lens, the fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is convex, and the fifth lens E5 has negative focal power, and its object side surface S8 is concave, and its image side surface S9 is concave. The sixth lens E6 has positive focal power, and its object side surface S10 is convex, and its image side surface S11 is convex. The seventh lens E7 has negative focal power, and its object side surface S12 is concave, and its image side surface S13 is concave. The eighth lens E8 has positive focal power, and its object side surface S14 is concave, and its image side surface S15 is convex. The ninth lens E9 has negative refractive power, and its object-side surface S16 is convex, and its image-side surface S17 is concave. Light from the object passes through the surfaces S1 to S17 in sequence and is finally imaged on the imaging surface S18.

[0144] Table 7 shows the basic parameter table of the optical lens of Example 5, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0145]

[0146] Table 7

[0147] In this embodiment, the object-side surface and the image-side surface of the first lens E1, the second lens E2, the third lens E3, the sixth lens E6, the seventh lens E7, the eighth lens E8 and the ninth lens E9 are all aspherical surfaces, and the surface shape x of each aspherical lens can be defined by, but not limited to, the formula (1) given in the aforementioned embodiment 1.

[0148] The following Tables 8-1 and 8-2 give the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0149]

[0150]

[0151] Table 8-1

[0152] Face number A18 A20 A22 A24 A26 A28 A30 S1 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S10 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S11 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S12 -2.9490E-08 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S13 -4.2457E-07 -2.1589E-08 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S14 6.8457E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S15 -1.1971E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S16 8.5278E-05 1.7172E-04 -3.8193E-06 4.8960E-06 3.1382E-07 0.0000E+00 0.0000E+00 S17 1.1319E-03 2.0567E-04 3.9340E-04 1.2813E-04 0.0000E+00 0.0000E+00 0.0000E+00

[0153] Table 8-2

[0154] Table 9 shows the parameters and zoom data of the optical lens of this embodiment corresponding to different magnifications.

[0155] Parameters / Magnification 2X 3X 6X Semi-FOV(°) 19.7989 14.2818 10.2040 f / EPD 2.0365 2.3606 2.6511 f(mm) 14.2000 16.7254 19.3992 ImgH(mm) 5.2594 4.3722 3.5656 T1(mm) 7.6178 5.2178 0.5000 T2(mm) 2.5000 1.3000 0.5000 T3(mm) 1.3999 3.4732 5.3080

[0156] Table 9

[0157] Fig. 10A The axial chromatic aberration curve of the optical lens of Example 5 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Fig. 10B The astigmatism curve of the optical lens of Example 5 is shown, which indicates the meridional field curvature and the sagittal field curvature. Fig. 10C The distortion curve of the optical lens of Example 5 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig. 10D The magnification chromatic aberration curve of the optical lens of Example 5 is shown, which indicates the deviation of different image heights on the imaging surface after the light passes through the lens. FIG. 10A to FIG. 10D It can be seen that the optical lens provided in Example 5 can achieve good imaging quality.

[0158] Example 6

[0159] The following reference Fig. 9 Describe the optical lens according to Example 6 of the present application. Fig. 9 The structure diagram of the optical lens of Example 6 corresponding to the magnification of 2X is shown. In this embodiment, for the sake of brevity, some descriptions similar to those of Example 5 will be omitted.

[0160] like Fig. 9 As shown, the optical lens comprises: a first lens group with negative optical power, a second lens group with optical power, and a third lens group with optical power, which are arranged in sequence from the object side to the image side along the optical axis.

[0161] The parameters such as the radius of curvature, center thickness, etc. of each lens of the optical lens of this embodiment and embodiment 5, as well as the spacing distance between lenses and high-order coefficients are the same, as shown in Table 7, Table 8-1, Table 8-2 and Table 9. In addition, the optical lens of this embodiment and embodiment 5 include the same number of lens barrels and spacing elements, and the only difference is that the actual parameters of the lens barrel and each spacing element are different, for example, at least one of the parameters such as the lens barrel size, the thickness of the spacing element, the inner diameter of the spacing element, the outer diameter of the spacing element, and the spacing distance between the spacing elements is different. In other words, the main structure for imaging is the same, while the auxiliary structure for imaging is different. Therefore, the imaging quality of the optical lens of embodiment 6 of the present application is as follows: FIG. 10A to FIG. 10D shown.

[0162] Example 7

[0163] The following reference Fig.11 Describe the optical lens according to Example 7 of the present application. Fig.11 A schematic diagram of the structure of the optical lens of Example 7 corresponding to a magnification of 2X is shown.

[0164] like Fig.11 As shown, the optical lens comprises: a first lens group with negative optical power, a second lens group with optical power, and a third lens group with optical power, which are arranged in sequence from the object side to the image side along the optical axis.

[0165] In this embodiment, the first lens group includes a first lens E1 and a second lens E2 located in the first lens barrel P10; the second lens group includes a third lens E3, an aperture STO, a fourth lens E4, a fifth lens E5 and a sixth lens E6 located in the second lens barrel P20; the third lens group includes a seventh lens E7, an eighth lens E8 and a ninth lens E9 located in the third lens barrel P30.

[0166] In this embodiment, the optical lens also includes at least one spacing element, wherein the at least one spacing element includes: a first spacing element P1, a third spacing element P3, a third auxiliary spacing element P3b, a fifth spacing element P5, a fifth auxiliary spacing element P5b, a seventh spacing element P7, an eighth spacing element P8 and an eighth auxiliary spacing element P8b.

[0167] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is convex. The second lens E2 has negative focal power, and its object side surface S3 is concave, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 and the fifth lens E5 form a doublet lens, the fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is convex, and the fifth lens E5 has negative focal power, and its object side surface S8 is concave, and its image side surface S9 is concave. The sixth lens E6 has positive focal power, and its object side surface S10 is convex, and its image side surface S11 is convex. The seventh lens E7 has negative focal power, and its object side surface S12 is concave, and its image side surface S13 is concave. The eighth lens E8 has positive focal power, and its object side surface S14 is convex, and its image side surface S15 is convex. The ninth lens E9 has negative refractive power, and its object-side surface S16 is convex, and its image-side surface S17 is concave. Light from the object passes through the surfaces S1 to S17 in sequence and is finally imaged on the imaging surface S18.

[0168] Table 10 shows the basic parameter table of the optical lens of Example 7, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0169]

[0170] Table 10

[0171] In this embodiment, the object-side surface and the image-side surface of the first lens E1, the second lens E2, the third lens E3, the sixth lens E6, the seventh lens E7, the eighth lens E8 and the ninth lens E9 are all aspherical surfaces, and the surface shape x of each aspherical lens can be defined by, but not limited to, the formula (1) given in the aforementioned embodiment 1.

[0172] The following Tables 11-1 and 11-2 give the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0173]

[0174]

[0175] Table 11-1

[0176] Face number A18 A20 A22 A24 A26 A28 A30 S1 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S10 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S11 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S12 -2.9541E-08 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S13 -6.1900E-07 -2.5625E-08 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S14 2.7894E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S15 -1.6342E-05 -1.1696E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S16 1.7384E-04 1.3465E-04 -8.6565E-06 3.6629E-06 3.1859E-07 0.0000E+00 0.0000E+00 S17 1.1350E-03 6.1974E-05 3.4724E-04 9.2306E-05 0.0000E+00 0.0000E+00 0.0000E+00

[0177] Table 11-2

[0178] Table 12 shows the parameters and zoom data of the optical lens of this embodiment corresponding to different magnifications.

[0179] Parameters / Magnification 2X 3X 6X Semi-FOV(°) 19.7989 14.2818 10.2040 f / EPD 2.0365 2.3998 2.7339 f(mm) 14.2000 17.0090 19.9931 ImgH(mm) 5.2606 4.4310 3.6676 T1(mm) 7.3858 4.9858 0.5000 T2(mm) 2.5000 1.3000 0.5000 T3(mm) 1.2639 3.4302 5.4039

[0180] Table 12

[0181] Fig.13A The axial chromatic aberration curve of the optical lens of Example 7 is shown, which indicates the deviation of light of different wavelengths from the focal point behind the lens. Fig. 13B The astigmatism curve of the optical lens of Example 7 is shown, which indicates the meridional field curvature and the sagittal field curvature. Fig. 13C The distortion curve of the optical lens of Example 7 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.13D The magnification chromatic aberration curve of the optical lens of Example 7 is shown, which indicates the deviation of different image heights on the imaging surface after the light passes through the lens. FIG. 13A to FIG. 13D It can be seen that the optical lens provided in Example 7 can achieve good imaging quality.

[0182] Example 8

[0183] The following reference Fig.12 Describe the optical lens according to Example 8 of the present application. Fig.12 The structure diagram of the optical lens of Example 8 corresponding to the magnification of 2X is shown. In this embodiment, for the sake of brevity, some descriptions similar to those of Example 7 will be omitted.

[0184] like Fig.12 As shown, the optical lens comprises: a first lens group with negative optical power, a second lens group with optical power, and a third lens group with optical power, which are arranged in sequence from the object side to the image side along the optical axis.

[0185] The parameters such as the radius of curvature, center thickness, etc. of each lens of the optical lens of this embodiment and embodiment 7, as well as the spacing distance between lenses and the coefficients of higher-order terms are the same, as shown in Table 10, Table 11-1, Table 11-2 and Table 12. In addition, the number of lens barrels and spacing elements included in the optical lens of this embodiment and embodiment 7 are also basically the same. The only difference is that this embodiment also includes a fifth auxiliary spacing element P5c, and the actual parameters of the lens barrel and each spacing element of this embodiment are different from those of embodiment 7. For example, at least one of the parameters such as the lens barrel size, the thickness of the spacing element, the inner diameter of the spacing element, the outer diameter of the spacing element, and the spacing distance between the spacing elements is different. In other words, the main structure for imaging is the same, while the auxiliary structure for imaging is different. Therefore, the imaging quality of the optical lens of embodiment 8 of the present application is as follows: FIG. 13A to FIG. 13D shown.

[0186] Example 9

[0187] The following reference Fig.14 Describe the optical lens according to Example 9 of the present application. Fig.14 A schematic diagram of the structure of the optical lens of Example 9 corresponding to a magnification of 2X is shown.

[0188] like Fig.14 As shown, the optical lens comprises: a first lens group with negative optical power, a second lens group with optical power, and a third lens group with optical power, which are arranged in sequence from the object side to the image side along the optical axis.

[0189] In this embodiment, the first lens group includes a first lens E1 and a second lens E2 located in the first lens barrel P10; the second lens group includes a third lens E3, an aperture STO, a fourth lens E4, a fifth lens E5 and a sixth lens E6 located in the second lens barrel P20; the third lens group includes a seventh lens E7, an eighth lens E8 and a ninth lens E9 located in the third lens barrel P30.

[0190] In this embodiment, the optical lens also includes at least one spacing element, wherein the at least one spacing element includes: a first spacing element P1, a third spacing element P3, a third auxiliary spacing element P3b, a fifth spacing element P5, a fifth auxiliary spacing element P5b, a fifth auxiliary spacing element P5c, a seventh spacing element P7 and an eighth spacing element P8.

[0191] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is convex. The second lens E2 has negative focal power, and its object side surface S3 is concave, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 and the fifth lens E5 form a doublet lens, the fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is convex, and the fifth lens E5 has negative focal power, and its object side surface S8 is concave, and its image side surface S9 is concave. The sixth lens E6 has positive focal power, and its object side surface S10 is convex, and its image side surface S11 is convex. The seventh lens E7 has negative focal power, and its object side surface S12 is concave, and its image side surface S13 is concave. The eighth lens E8 has positive focal power, and its object side surface S14 is convex, and its image side surface S15 is convex. The ninth lens E9 has negative refractive power, and its object-side surface S16 is convex, and its image-side surface S17 is concave. Light from the object passes through the surfaces S1 to S17 in sequence and is finally imaged on the imaging surface S18.

[0192] Table 13 shows the basic parameter table of the optical lens of Example 9, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0193]

[0194]

[0195] Table 13

[0196] In this embodiment, the object-side surface and the image-side surface of the first lens E1, the second lens E2, the third lens E3, the sixth lens E6, the seventh lens E7, the eighth lens E8 and the ninth lens E9 are all aspherical surfaces, and the surface shape x of each aspherical lens can be defined by, but not limited to, the formula (1) given in the aforementioned embodiment 1.

[0197] Tables 14-1 and 14-2 below give the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A3 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0198] Face number A4 A6 A8 A10 A12 A14 A16 S1 1.3500E-02 4.3161E-03 2.9421E-04 -2.8254E-04 -4.9852E-05 -1.8096E-05 -1.1121E-05 S2 2.9079E-01 -3.8898E-02 8.5597E-03 -2.8684E-03 9.7481E-04 -2.4852E-04 3.5858E-05 S3 1.0110E-01 -1.9339E-02 5.4625E-03 -1.9223E-03 9.1660E-04 -2.8178E-04 5.3940E-05 S4 -2.0868E-01 1.2133E-02 -2.1751E-03 4.1045E-04 -3.0266E-05 -1.1190E-05 -2.0424E-06 S5 -5.3102E-02 -1.1917E-03 3.1469E-04 1.6478E-04 7.2700E-05 2.9641E-05 9.5741E-06 S6 3.4408E-02 3.3054E-04 3.0131E-04 8.8910E-05 3.5769E-05 1.4763E-05 3.8189E-06 S10 -2.3687E-02 -9.6093E-04 2.8700E-04 4.5930E-05 7.0754E-06 1.8795E-06 1.8242E-07 S11 -2.5975E-02 -4.2361E-03 -2.6837E-06 3.2345E-05 4.5046E-07 9.5299E-06 -2.6979E-07 S12 6.1551E-01 -5.8814E-02 9.2051E-03 -2.4298E-03 6.8310E-04 -5.0751E-05 -4.9881E-05 S13 4.6603E-01 -3.5935E-02 8.1838E-03 -2.8234E-03 8.1575E-04 1.7276E-04 -4.0005E-06 S14 -3.3405E-01 -7.2406E-03 1.0544E-02 -2.2996E-03 -4.9904E-04 -4.2120E-05 1.3151E-04 S15 -3.7013E-01 6.7113E-03 7.4046E-03 3.3608E-03 -1.1457E-03 3.5400E-04 -3.7253E-04 S16 -2.0658E+00 3.1814E-01 -6.5981E-02 2.3464E-02 -3.8560E-03 1.8877E-03 -7.6464E-04 S17 -3.3158E+00 5.5818E-01 -1.7437E-01 5.6449E-02 -1.6264E-02 6.7654E-03 -2.9484E-03

[0199] Table 14-1

[0200] Face number A18 A20 A22 A24 A26 A28 A30 S1 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S10 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S11 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S12 -2.9308E-08 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S13 -1.5683E-07 -1.6197E-08 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S14 2.9105E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S15 -1.5228E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S16 1.3674E-04 1.8657E-04 5.4178E-06 1.1726E-05 6.2597E-07 0.0000E+00 0.0000E+00 S17 1.2864E-03 7.9200E-05 4.0934E-04 1.1158E-04 0.0000E+00 0.0000E+00 0.0000E+00

[0201] Table 14-2

[0202] Table 15 shows the parameters and zoom data of the optical lens of this embodiment corresponding to different magnifications.

[0203] Parameters / Magnification 2X 3X 6X Semi-FOV(°) 19.7989 14.2818 10.2040 f / EPD 2.0365 2.3882 2.7056 f(mm) 14.2000 16.9041 19.6462 ImgH(mm) 5.2604 4.4071 3.6009 T1(mm) 6.9057 4.5057 0.5000 T2(mm) 2.5000 1.3000 0.5000 T3(mm) 1.3291 3.4641 5.3781

[0204] Table 15

[0205] Fig.16A The axial chromatic aberration curve of the optical lens of Example 9 is shown, which indicates the deviation of light of different wavelengths from the focal point behind the lens. Fig. 16B The astigmatism curve of the optical lens of Example 9 is shown, which represents the meridional field curvature and the sagittal field curvature. Fig. 16C The distortion curve of the optical lens of Example 9 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.16D The magnification chromatic aberration curve of the optical lens of Example 9 is shown, which indicates the deviation of different image heights on the imaging surface after the light passes through the lens. FIG. 16A to FIG. 16D It can be seen that the optical lens provided in Example 9 can achieve good imaging quality.

[0206] Example 10

[0207] The following reference Fig.15 An optical lens according to Example 10 of the present application is described. Fig.15 The structure diagram of the optical lens of Example 10 corresponding to the magnification of 2X is shown. In this embodiment, for the sake of brevity, some descriptions similar to those of Example 9 will be omitted.

[0208] like Fig.15 As shown, the optical lens comprises: a first lens group with negative optical power, a second lens group with optical power, and a third lens group with optical power, which are arranged in sequence from the object side to the image side along the optical axis.

[0209] The parameters such as the radius of curvature, center thickness, etc. of each lens of the optical lens of this embodiment and embodiment 9, as well as the spacing distance between lenses and the coefficients of higher-order terms are the same, as shown in Table 13, Table 14-1, Table 14-2 and Table 15. In addition, the optical lens of this embodiment and embodiment 9 include the same number of lens barrels and spacing elements, and the only difference is that the actual parameters of the lens barrel and each spacing element are different, for example, at least one of the parameters such as the lens barrel size, the thickness of the spacing element, the inner diameter of the spacing element, the outer diameter of the spacing element, and the spacing distance between the spacing elements is different. In other words, the main structure for imaging is the same, while the auxiliary structure for imaging is different. Therefore, the imaging quality of the optical lens of embodiment 9 of the present application is as follows: FIG. 16A to FIG. 16D shown.

[0210] Tables 16-1 and 16-2 below respectively show some parameters of the optical lenses of Examples 1 to 10, such as the effective focal lengths of some lenses and the combined focal lengths of the lens groups, etc. The units of each focal length value are millimeters (mm).

[0211] Parameter value / example 1 2 3 4 5 f1(mm) 13.49 13.49 14.55 14.55 15.55 f2(mm) -10.92 -10.92 -11.87 -11.87 -12.71 f3(mm) 8.95 8.95 8.88 8.88 8.83 f45(mm) -8.27 -8.27 -8.09 -8.09 -7.97 f6(mm) 9.04 9.04 9.18 9.18 9.27 f7(mm) -14.54 -14.54 -14.93 -14.93 -15.26 f8(mm) 12.53 12.53 13.49 13.49 14.05 f9(mm) -9.00 -9.00 -9.81 -9.81 -10.35 f12(mm) -140.88 -140.88 -152.48 -152.48 -158.97

[0212] Table 16-1

[0213] Parameter value / example 6 7 8 9 10 f1(mm) 15.55 12.55 12.55 11.55 11.55 f2(mm) -12.71 -10.29 -10.29 -9.56 -9.56 f3(mm) 8.83 8.89 8.89 8.85 8.85 f45(mm) -7.97 -8.15 -8.15 -8.11 -8.11 f6(mm) 9.27 9.00 9.00 9.00 9.00 f7(mm) -15.26 -14.26 -14.26 -13.62 -13.62 f8(mm) 14.05 12.85 12.85 13.00 13.00 f9(mm) -10.35 -9.35 -9.35 -9.92 -9.92 f12(mm) -158.97 -158.81 -158.81 -175.09 -175.09

[0214] Table 16-2

[0215] Tables 17-1 and 17-2 below show some basic parameters of the lens barrel and the spacer element of the optical lens of Examples 1 to 10, such as the height of the lens barrel, the maximum thickness of the spacer element, the interval between the spacer elements, etc. The units of the basic parameters listed in the table are all millimeters (mm).

[0216]

[0217]

[0218] Table 17-1

[0219] Parameter value / example 6 7 8 9 10 d1s(mm) 8.060 8.080 8.050 8.110 8.130 d1m(mm) 8.060 8.080 8.050 8.210 8.210 D1s(mm) 9.460 9.160 8.850 9.360 9.280 D1m(mm) 9.460 9.160 8.850 9.360 9.280 d3m(mm) 6.360 6.240 6.300 6.170 6.280 d5s(mm) 5.100 5.130 5.110 5.080 5.080 D5s(mm) 7.850 7.830 7.710 7.860 7.720 D7s(mm) 9.880 9.540 8.840 8.840 8.760 D8s(mm) 10.230 9.640 9.040 10.800 10.700 D8m(mm) 10.230 9.640 9.040 10.800 10.700 CP3(mm) 0.030 0.018 0.030 0.018 0.030 CP3b(mm) 0.582 0.526 0.514 0.512 0.512 EP307(mm) 1.422 1.450 1.450 1.450 1.442 L10(mm) 3.574 3.675 3.749 3.675 3.675 L20(mm) 7.642 7.659 7.759 7.564 7.564

[0220] Table 17-2 In summary, in Examples 1 to 10, the optical lenses respectively meet the conditions in Tables 18-1 and 18-2 below.

[0221]

[0222]

[0223] Table 18-1

[0224] Conditional / Example 6 7 8 9 10 T56 / T34 24.72 25.51 25.51 23.82 23.82 f45 / (D5s-d5s) -2.90 -3.02 -3.14 -2.92 -3.07 T56 / (T34+CP3b+CP3) 2.86 3.27 3.27 3.12 3.06 L20 / (CT3+CT6) 2.47 2.54 2.57 2.38 2.38 f1 / R1+f1 / d1s 3.70 3.16 3.16 2.94 2.94 f2 / (D1m-d1m) -9.08 -9.53 -12.86 -8.31 -8.93 (R1 / R4) / (D1s / d1s) 1.08 1.13 1.16 1.14 1.15 f12 / (L10*V2) -1.19 -1.16 -1.13 -1.27 -1.27 (N4*R7) / d3m 2.71 2.91 2.88 2.92 2.87 (N5*R9) / d5s -4.85 -4.49 -4.50 -4.74 -4.74 EP307 / CT7 3.84 3.63 3.63 3.82 3.80 V7*f7 / D7s -37.04 -35.84 -38.68 -36.95 -37.29 V8*f8 / D8s 26.43 25.64 27.34 23.16 23.38 (V3-V4)*CP3 / T34 11.51 6.90 11.51 6.90 11.51 f9*D8m / (R18*CT9) -30.41 -24.74 -23.20 -30.35 -30.07 (R13+R14) / R16 -5.18 -3.09 -3.09 -2.24 -2.24

[0225] Table 18-2

[0226] The following Table 19 shows a comparative analysis of the stray light effects of Sample 1, Sample 2, and Sample 3 of the optical lens. As described above, the optical lens provided by the present application can ensure a small offset by controlling the ratio of the air spacing between the third lens and the fourth lens, and the fifth lens and the sixth lens on the optical axis, so that the MTF curve is more concentrated, which is beneficial to improving the resolution of the optical system; however, it will cause stray light to appear inside the lens, especially in the fourth lens and the fifth lens. To address this problem, at least one spacing element is provided, and the ratio between the difference between the combined focal length of the fourth lens and the fifth lens and the inner and outer diameters of the object side of the fifth spacing element is controlled within a certain range, which can effectively eliminate stray light. Combined with Fig.17A and Fig. 17B ,as well as Fig.18A and Fig.18B As shown, through experimental comparison of optical lenses, it can be found that if the numerical range of the conditional formula 23.0<T56 / T34<26.5 and -4.0<f45 / (D5s-d5s)<-2.5 is exceeded, the optical performance of the optical lens is unqualified, for example Fig.17A Sample 2 and Fig.18A Sample 3 shown; and by satisfying the numerical range of the conditional expression, such as Fig. 17B and Fig.18B The sample 1 shown has a better effect of eliminating stray light than the samples 2 and 3 which are outside the numerical range of the conditional expression.

[0227]

[0228] Table 19

[0229] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the concept of the utility model. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) by each other to form a technical solution.

Claims

1. An optical lens, characterized in that: Including the following arranged in order from the object side to the image side: A first lens group having negative optical power, comprising a first lens and a second lens; a second lens group having optical power, comprising a third lens, a fourth lens, a fifth lens and a sixth lens; as well as a third lens group having optical power, comprising a seventh lens, an eighth lens and a ninth lens; The optical lens further comprises at least one spacer element, wherein the at least one spacer element comprises: a fifth spacer element located between the fifth lens and the sixth lens and directly in contact with the image side surface of the fifth lens; The air interval T56 between the fifth lens and the sixth lens on the optical axis and the air interval T34 between the third lens and the fourth lens on the optical axis satisfy: 23.0<T56 / T34<26.5; The combined focal length f45 of the fourth lens and the fifth lens, the outer diameter D5s of the object side surface of the fifth spacing element, and the inner diameter d5s of the object side surface of the fifth spacing element satisfy: -4.0<f45 / (D5s-d5s)<-2.

5.

2. The optical lens according to claim 1, wherein: The optical lens comprises a first lens barrel, a second lens barrel and a third lens barrel, wherein the first lens group is located in the first lens barrel, the second lens group is located in the second lens barrel, and the third lens group is located in the third lens barrel.

3. The optical lens according to claim 1, wherein: The at least one spacer element further comprises a first spacer element located between the first lens and the second lens and in direct contact with the image side of the first lens, The effective focal length f1 of the first lens, the curvature radius R1 of the object-side surface of the first lens, and the inner diameter d1s of the object-side surface of the first spacing element satisfy: 2.9<f1 / R1+f1 / d1s<4.

0.

4. The optical lens according to claim 1, wherein: The at least one spacer element further comprises a first spacer element located between the first lens and the second lens and in direct contact with the image side of the first lens, The effective focal length f2 of the second lens, the outer diameter D1m of the image side surface of the first spacer element, and the inner diameter d1m of the image side surface of the first spacer element satisfy: -13.0<f2 / (D1m-d1m)<-8.

0.

5. The optical lens according to claim 1, wherein: The at least one spacer element further comprises a third spacer element located between the third lens and the fourth lens and in direct contact with the image side of the third lens, A refractive index N4 of the fourth lens, a curvature radius R7 of the object-side surface of the fourth lens, and an inner diameter d3m of the image-side surface of the third spacing element satisfy: 2.5<(N4*R7) / d3m<3.

0.

6. The optical lens according to claim 1, wherein: The at least one spacer element further comprises a first spacer element located between the first lens and the second lens and in direct contact with the image side of the first lens, The curvature radius R1 of the object side surface of the first lens, the curvature radius R4 of the image side surface of the second lens, the outer diameter D1s of the object side surface of the first spacer element, and the inner diameter d1s of the object side surface of the first spacer element satisfy: 1.0<(R1 / R4) / (D1s / d1s)<1.

5.

7. The optical lens according to claim 2, wherein: The at least one spacer element further includes a seventh spacer element located between the seventh lens and the eighth lens and in direct contact with the image side of the seventh lens, The Abbe number V7 of the seventh lens, the effective focal length f7 of the seventh lens, and the object side outer diameter D7s of the seventh spacing element satisfy: -39.0<V7*f7 / D7s<-34.

0.

8. The optical lens according to claim 1, wherein: The refractive index N5 of the fifth lens, the curvature radius R9 of the object-side surface of the fifth lens, and the inner diameter d5s of the object-side surface of the fifth spacer element satisfy: -4.9<(N5*R9) / d5s<-4.

3.

9. The optical lens according to claim 1, wherein: The at least one spacer element further comprises an eighth spacer element located between the eighth lens and the ninth lens and in direct contact with the image side surface of the eighth lens, The Abbe number V8 of the eighth lens, the effective focal length f8 of the eighth lens, and the outer diameter D8s of the object side surface of the eighth spacer element satisfy: 22.5<V8*f8 / D8s<27.

5.

10. The optical lens according to claim 1, wherein: The at least one spacing element further comprises a third spacing element located between the third lens and the fourth lens and in direct contact with the image side of the third lens, and a third auxiliary spacing element located between the third lens and the fourth lens and in direct contact with the image side of the third spacing element, The air gap T56 between the fifth lens and the sixth lens on the optical axis, the air gap T34 between the third lens and the fourth lens on the optical axis, the maximum thickness CP3 of the third spacing element, and the maximum thickness CP3b of the third auxiliary spacing element satisfy: 2.4<T56 / (T34+CP3b+CP3)<3.

28.

11. The optical lens according to claim 2, wherein: The maximum height L20 of the second lens, the center thickness CT3 of the third lens on the optical axis, and the center thickness CT6 of the sixth lens on the optical axis satisfy: 2.3<L20 / (CT3+CT6)<2.

7.

12. The optical lens according to claim 1, wherein: The at least one spacer element further comprises a third spacer element located between the third lens and the fourth lens and in direct contact with the image side of the third lens, The Abbe number V3 of the third lens, the Abbe number V4 of the fourth lens, the maximum thickness CP3 of the third spacer element, and the air interval T34 between the third lens and the fourth lens on the optical axis satisfy: 6.5<(V3-V4)*CP3 / T34<11.

6.

13. The optical lens according to claim 2, wherein: The maximum height L10 of the first lens barrel, the combined focal length f12 of the first lens and the second lens, and the Abbe number V2 of the second lens satisfy: -1.3<f12 / (L10*V2)<-0.

9.

14. The optical lens according to claim 2, wherein: The at least one spacer element further includes a seventh spacer element located between the seventh lens and the eighth lens and in direct contact with the image side of the seventh lens, The interval EP307 between the front end surface of the third lens barrel and the seventh spacing element and the center thickness CT7 of the seventh lens on the optical axis satisfy the following: 3.0<EP307 / CT7<4.

0.

15. The optical lens according to claim 2, wherein: The at least one spacer element further comprises an eighth spacer element located between the eighth lens and the ninth lens and in direct contact with the image side surface of the eighth lens, The effective focal length f9 of the ninth lens, the outer diameter D8m of the image side surface of the eighth spacer element, the curvature radius R18 of the image side surface of the ninth lens, and the center thickness CT9 of the ninth lens on the optical axis satisfy: -30.5<f9*D8m / (R18*CT9)<-23.

0.

16. The optical lens according to claim 1, wherein: The object side surface of the seventh lens is concave, and the image side surface is convex; the image side surface of the eighth lens is convex, A curvature radius R13 of the object side surface of the seventh lens, a curvature radius R14 of the image side surface of the seventh lens, and a curvature radius R16 of the image side surface of the eighth lens satisfy: -5.5<(R13+R14) / R16<-2.0.

Images