Image-capturing system

Abstract

The application discloses an image taking system, which comprises a lens barrel, a lens set and a positioning piece set accommodated in the lens barrel. The lens set comprises first to sixth lenses arranged in sequence from an object side to an image side along an optical axis, wherein the object side surface of the sixth lens is a convex surface. The positioning piece set comprises a first positioning piece in contact with the image side surface of the first lens, a second positioning piece in contact with the image side surface of the second lens, a third positioning piece in contact with the image side surface of the third lens, a fourth positioning piece in contact with the image side surface of the fourth lens, a fifth positioning piece in contact with the image side surface of the fifth lens, and a sixth positioning piece in contact with the image side surface of the sixth lens. The outer diameter D6s of the object side surface of the sixth positioning piece, the inner diameter d6s of the object side surface of the sixth positioning piece, the outer diameter D5m of the image side surface of the fifth positioning piece, the inner diameter d5m of the image side surface of the fifth positioning piece, and the maximum thickness CP6 of the sixth positioning piece along the optical axis direction satisfy: 2mm ‑1 <(D6s+d6s) / ((D5m+d5m)×CP6)<4mm ‑1 .

Description

[0001] Divisional Application Declaration

[0002] This application is a divisional application of the China Invention Patent Application No. 202310239908.7, filed on March 7, 2023, entitled "Image-capturing System", and claiming priority to the China Invention Patent Application No. 202210858593.8, filed on July 15, 2022. TECHNICAL FIELD

[0003] The present application relates to the field of optical elements, and more particularly, to an image-capturing system. BACKGROUND

[0004] At present, with the gradual upgrading of small lens technology, people are no longer satisfied with regular photography, and more applications are used in video communication, selfie and other scenes. The layout of the front camera of mobile phones, tablets and other devices is roughly arranged in a notch or hole-punching manner. At the same time, in order to take into account the smaller screen ratio, the development iteration direction of the front camera head size is also smaller and smaller. On the other hand, in order to facilitate users to take selfies and video communication, the scene range of the camera is wider, and it is not necessary to place the mobile phone farther to shoot a larger scene range, and the design of the field of view angle of the front camera is also developing in the direction of larger and larger field of view angle.

[0005] Therefore, it has become one of the problems that the technical personnel in the current field are trying to solve to develop and design an image-capturing system which can have a super-small head on the basis of ensuring that the lens has a super-large field of view angle and good imaging effect, so as to meet the use requirements of various portable electronic products in the front camera scene, at the same time, it also needs to take into account the requirement of the processability of sensitive lenses in the mechanism. SUMMARY

[0006] The present application provides an image capturing system, which can include a lens barrel, a lens group and a positioning member group accommodated in the lens barrel. The lens group can include a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens arranged in order from an object side to an image side along an optical axis, wherein the object side surface of the sixth lens is a convex surface. The positioning member group can include a first positioning member in contact with the image side surface of the first lens, a second positioning member in contact with the image side surface of the second lens, a third positioning member in contact with the image side surface of the third lens, a fourth positioning member in contact with the image side surface of the fourth lens, a fifth positioning member in contact with the image side surface of the fifth lens, and a sixth positioning member in contact with the image side surface of the sixth lens. The radius of curvature R5 of the object side surface of the third lens, the inner diameter d2m of the image side surface of the second positioning member, the radius of curvature R4 of the image side surface of the second lens and the inner diameter d2s of the object side surface of the second positioning member can satisfy: 7 < R5 / d2m + R4 / d2s < 200. The Abbe number V6 of the sixth lens, the outer diameter D5s of the object side surface of the fifth positioning member and the radius of curvature R11 of the object side surface of the sixth lens can satisfy: 20 < V6×D5s / R11 < 38.

[0007] In one embodiment, the effective focal length f2 of the second lens and the effective focal length f1 of the first lens can satisfy: f2 / f1 < 0.

[0008] In one embodiment, the radius of curvature Ra of the object side surface and the radius of curvature Rb of the image side surface of the lens adjacent to the object side of the positioning member with the smallest inner diameter of the image side surface in the positioning member group can satisfy: Ra / Rb > 0.

[0009] In one embodiment, the outer diameter D5s of the object side surface of the fifth positioning member, the inner diameter d4m of the image side surface of the fourth positioning member and the edge thickness et5 of the fifth lens can satisfy: 2 < (D5s-d4m) / et5 < 6.

[0010] In one embodiment, the outer diameter D6s of the object side surface of the sixth positioning member, the inner diameter d6s of the object side surface of the sixth positioning member, the outer diameter D5m of the image side surface of the fifth positioning member, the inner diameter d5m of the image side surface of the fifth positioning member and the maximum thickness CP6 of the sixth positioning member along the optical axis direction can satisfy: 2mm -1 <(D6s+d6s) / ((D5m+d5m)×CP6)<4mm -1 .

[0011] In one embodiment, the Abbe number V1 of the first lens, a distance EP01 on the optical axis from the object-side end surface of the lens barrel to the object-side surface of the first positioning member, and a central thickness CT1 of the first lens on the optical axis can satisfy 55 < V1 x EP01 / CT1 < 75.

[0012] In one embodiment, a maximum effective radius DT51 of the object-side surface of the fifth lens, a maximum effective radius DT52 of the image-side surface of the fifth lens, and a distance EP45 on the optical axis from the image-side surface of the fourth positioning member to the object-side surface of the fifth positioning member can satisfy 24 < (DT51 + DT52) / EP45 < 33.

[0013] In one embodiment, a distance TD on the optical axis from the object-side surface of the first lens to the image-side surface of the sixth lens, an outer diameter D0m of the image-side end surface of the lens barrel, a refractive index Na of a lens having the largest refractive index among the lens group, and a refractive index Nb of a lens having the second largest refractive index among the lens group can satisfy 1.7 < TD / D0m x (Na + Nb) < 1.9.

[0014] In one embodiment, an effective focal length f4 of the fourth lens, a maximum thickness CP3 of the third positioning member in the direction of the optical axis, and a maximum thickness CP4 of the fourth positioning member in the direction of the optical axis can satisfy -149 < f4 / (CP4 + CP3) < -68.

[0015] In one embodiment, a distance T23 on the optical axis from the image-side surface of the second lens to the object-side surface of the third lens, an outer diameter D2m of the image-side surface of the second positioning member, and a maximum thickness CP2 of the second positioning member in the direction of the optical axis can satisfy 53 mm < T23 x D2m / CP2 < 216 mm.

[0016] In another aspect, the present disclosure also provides an image capturing system, which can include a lens barrel and a lens group and a positioning member group accommodated in the lens barrel. The lens group can include, in order from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, wherein an object side surface of the sixth lens is convex. The positioning member group can include a first positioning member in contact with an image side surface of the first lens, a second positioning member in contact with an image side surface of the second lens, a third positioning member in contact with an image side surface of the third lens, a fourth positioning member in contact with an image side surface of the fourth lens, a fifth positioning member in contact with an image side surface of the fifth lens, and a sixth positioning member in contact with an image side surface of the sixth lens, wherein a material of the fourth positioning member and the fifth positioning member can include plastic and / or metal. A radius of curvature R6 of the image side surface of the third lens, an outer diameter D3m of the image side surface of the third positioning member, a radius of curvature R7 of the object side surface of the fourth lens, and an outer diameter D3s of the object side surface of the third positioning member can satisfy: 5 < |R6 / D3m+R7 / D3s| < 50.

[0017] In one embodiment, an effective focal length f2 of the second lens and an effective focal length f1 of the first lens can satisfy: f2 / f1 < 0.

[0018] In one embodiment, a radius of curvature Ra of an object side surface and a radius of curvature Rb of an image side surface of a lens adjacent to an object side surface of a positioning member having a smallest inner diameter of an image side surface in the positioning member group can satisfy: Ra / Rb > 0.

[0019] In one embodiment, an outer diameter D5s of an object side surface of the fifth positioning member, an inner diameter d4m of an image side surface of the fourth positioning member, and an edge thickness et5 of the fifth lens can satisfy: 2 < (D5s-d4m) / et5 < 6.

[0020] In one embodiment, an outer diameter D6s of an object side surface of the sixth positioning member, an inner diameter d6s of an object side surface of the sixth positioning member, an outer diameter D5m of an image side surface of the fifth positioning member, an inner diameter d5m of an image side surface of the fifth positioning member, and a maximum thickness CP6 of the sixth positioning member along the optical axis direction can satisfy: 2 mm -1 <(D6s+d6s) / ((D5m+d5m) x CP6) < 4 mm -1 .

[0021] In one embodiment, an Abbe number V1 of the first lens, a distance EP01 on the optical axis from an object side end surface of the lens barrel to an object side surface of the first positioning member, and a central thickness CT1 of the first lens on the optical axis can satisfy: 55 < V1 x EP01 / CT1 < 75.

[0022] In one embodiment, the maximum effective radius DT51 of the object side surface of the fifth lens, the maximum effective radius DT52 of the image side surface of the fifth lens, and the distance EP45 on the optical axis from the image side surface of the fourth positioning member to the object side surface of the fifth positioning member can satisfy: 24 < (DT51 + DT52) / EP45 < 33.

[0023] In one embodiment, the distance TD on the optical axis from the object side surface of the first lens to the image side surface of the sixth lens, the outer diameter D0m of the image side end surface of the lens barrel, the refractive index Na of the lens with the largest refractive index in the lens group, and the refractive index Nb of the lens with the second largest refractive index in the lens group can satisfy: 1.7 < TD / D0m x (Na + Nb) < 1.9.

[0024] In one embodiment, the effective focal length f4 of the fourth lens, the maximum thickness CP3 of the third positioning member along the optical axis direction, and the maximum thickness CP4 of the fourth positioning member along the optical axis direction can satisfy: -149 < f4 / (CP4 + CP3) < -68.

[0025] In one embodiment, the distance T23 on the optical axis from the image side surface of the second lens to the object side surface of the third lens, the outer diameter D2m of the image side surface of the second positioning member, and the maximum thickness CP2 of the second positioning member along the optical axis direction can satisfy: 53 mm < T23 x D2m / CP2 < 216 mm.

[0026] The image capturing system provided in the present application includes a lens barrel, a six-lens imaging lens group assembled in the lens barrel, and six positioning members respectively arranged on the image side of each lens. By reasonably setting the curvature radius of the object side surface of the third lens and the inner diameter of the image side surface of the second positioning member, and the curvature radius of the image side surface of the second lens and the inner diameter of the object side surface of the second positioning member, so that they satisfy 7 < R5 / d2m + R4 / d2s < 200, and by reasonably controlling the Abbe number of the sixth lens, the outer diameter of the object side surface of the fifth positioning member, and the curvature radius of the object side surface of the sixth lens, so that they satisfy 20 < V6 x D5s / R11 < 38, the problem of increased tolerance sensitivity of the sixth lens caused by excessive surface bending can be avoided. BRIEF DESCRIPTION OF DRAWINGS

[0027] Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments, when read in conjunction with the accompanying drawings. In the drawings:

[0028] Figure 1 The structure and part of the parameter schematic diagram of the image capturing system according to the exemplary embodiments of the present application are shown;

[0029] Figure 2A schematic diagram showing that the imaging system according to the exemplary embodiment of the present application effectively reduces the case of stray light is shown.

[0030] Figures 3A to 3C Structural schematic diagrams of the imaging system according to Embodiment 1 of the present application in three different embodiments are shown, respectively.

[0031] Figures 4A to 4C Astigmatism curves, distortion curves, and lateral chromatic aberration curves of the imaging system of Embodiment 1 are shown, respectively.

[0032] Figures 5A to 5C Structural schematic diagrams of the imaging system according to Embodiment 2 of the present application in three different embodiments are shown, respectively.

[0033] Figures 6A to 6C Astigmatism curves, distortion curves, and lateral chromatic aberration curves of the imaging system of Embodiment 2 are shown, respectively.

[0034] Figures 7A to 7C Structural schematic diagrams of the imaging system according to Embodiment 3 of the present application in three different embodiments are shown, respectively; and

[0035] Figures 8A to 8C Astigmatism curves, distortion curves, and lateral chromatic aberration curves of the imaging system of Embodiment 3 are shown, respectively. DETAILED DESCRIPTION

[0036] For a better understanding of the present application, various aspects of the present application will be described in greater detail below with reference to the accompanying drawings. It is to be understood that the detailed description is merely descriptive of exemplary embodiments of the present application and does not limit the scope of the present application in any manner. Throughout the specification, like reference numerals refer to like elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0037] It is to be noted that the expressions first, second, third, etc. in the present specification are merely used to distinguish one feature from another feature, and do not represent any limitation on the features. Thus, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.

[0038] In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shape of the spherical surface or the aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0039] In the present specification, the paraxial region refers to a region near the optical axis. If a lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The judgment of the surface shape in the paraxial region can be made according to the general method in the art, for example, judging convexity and concavity by the sign of R value (R refers to the radius of curvature in the paraxial region). In the present specification, the surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the imaging plane is referred to as the image side surface of the lens. In terms of the object side surface, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave. In terms of the image side surface, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex.

[0040] It should also be understood that the words "comprise", "comprising", "include", "including", and / or "contain", when used in this specification, specify the presence of stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or groups thereof. In addition, when descriptive terms such as "at least one of" appear in a list of items, the phrase modifies the entire list of items and does not modify the individual items themselves. In addition, when describing embodiments of the present application, the word "may" means "one or more embodiments of the present application". Furthermore, the word "exemplary" is intended to mean "an example of".

[0041] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that the terms should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0042] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The following embodiments only express several implementation manners of the present application, which are described in detail and specifically, but should not be construed as limiting the scope of the patent of the present application. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection of the present application. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0043] The features, principles and other aspects of the present application are described in detail below.

[0044] The image capturing system according to the exemplary embodiments of the present application can include a lens barrel, and a lens group and a positioning member group accommodated in the lens barrel. The lens group can include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in order from an object side to an image side along an optical axis. The positioning member group can include six positioning members respectively provided on the image side of each lens, wherein the first positioning member is in contact with the image side surface of the first lens; the second positioning member is in contact with the image side surface of the second lens; the third positioning member is in contact with the image side surface of the third lens; the fourth positioning member is in contact with the image side surface of the fourth lens; the fifth positioning member is in contact with the image side surface of the fifth lens; and the sixth positioning member is in contact with the image side surface of the sixth lens.

[0045] In the exemplary embodiments, the object side surface of the sixth lens can be a convex surface.

[0046] In the exemplary embodiments, the image capturing system according to the present application can satisfy a condition formula 7 < R5 / d2m + R4 / d2s < 200, wherein R5 is the radius of curvature of the object side surface of the third lens, d2m is the inner diameter of the image side surface of the second positioning member, R4 is the radius of curvature of the image side surface of the second lens, and d2s is the inner diameter of the object side surface of the second positioning member. By controlling the sum of the ratio of the radius of curvature of the object side surface of the third lens to the inner diameter of the image side surface of the second positioning member and the ratio of the radius of curvature of the image side surface of the second lens to the inner diameter of the object side surface of the second positioning member to be within the range, it is beneficial to better correct chromatic aberration and improve the imaging quality of the system. More specifically, R5, d2m, R4, and d2s can satisfy 9 < R5 / d2m + R4 / d2s < 140.

[0047] In the exemplary embodiments, the image capturing system according to the present application can satisfy a condition formula 20 < V6 x D5s / R11 < 38, wherein V6 is the Abbe number of the sixth lens, D5s is the outer diameter of the object side surface of the fifth positioning member, and R11 is the radius of curvature of the object side surface of the sixth lens. By controlling the Abbe number of the sixth lens, the outer diameter of the object side surface of the fifth positioning member, and the radius of curvature of the object side surface of the sixth lens to satisfy 20 < V6 x D5s / R11 < 38, it is beneficial to better correct chromatic aberration, improve the imaging quality of the system, and at the same time, avoid the problem of increased tolerance sensitivity of the sixth lens caused by excessive concentration of optical power and excessive bending of the surface.

[0048] In the exemplary embodiments, the image capturing system according to the present application can satisfy a condition formula f2 / f1 < 0, wherein f2 is the effective focal length of the second lens, and f1 is the effective focal length of the first lens. By reasonably controlling the ratio of the effective focal length of the second lens to the effective focal length of the first lens to be within the range, it is beneficial to reduce the stray light from the internal reflection of the first lens.

[0049] In exemplary embodiments, the image capturing system of the present application can satisfy the condition formula Ra / Rb>0, wherein Ra is the radius of curvature of the object side surface of the lens adjacent to the object side of the positioning member with the smallest inner diameter of the image side surface in the positioning member set, and Rb is the radius of curvature of the image side surface of the lens adjacent to the object side of the positioning member with the smallest inner diameter of the image side surface in the positioning member set. By controlling the ratio of the radius of curvature of the object side surface and the radius of curvature of the image side surface of the lens adjacent to the object side of the positioning member with the smallest inner diameter of the image side surface in the positioning member set to be within the range, the introduction of spherical aberration is reduced, and the imaging quality of the system is improved.

[0050] In exemplary embodiments, the image capturing system of the present application can satisfy the condition formula 2<(D5s-d4m) / et5<6, wherein D5s is the outer diameter of the object side surface of the fifth positioning member, d4m is the inner diameter of the image side surface of the fourth positioning member, and et5 is the edge thickness of the fifth lens. By controlling the ratio of the difference between the outer diameter of the object side surface of the fifth positioning member and the inner diameter of the image side surface of the fourth positioning member and the edge thickness of the fifth lens to be within the range, the processing property of the fifth lens is improved, and the difficulty of molding manufacturing is reduced.

[0051] In exemplary embodiments, the image capturing system of the present application can satisfy the condition formula 2mm -1 <(D6s+d6s) / ((D5m+d5m)×CP6)<4mm -1 , wherein D6s is the outer diameter of the object side surface of the sixth positioning member, d6s is the inner diameter of the object side surface of the sixth positioning member, D5m is the outer diameter of the image side surface of the fifth positioning member, d5m is the inner diameter of the image side surface of the fifth positioning member, and CP6 is the maximum thickness of the sixth positioning member along the optical axis. By controlling the outer diameter and the inner diameter of the object side surface of the sixth positioning member, the outer diameter and the inner diameter of the image side surface of the fifth positioning member, and the maximum thickness of the sixth positioning member along the optical axis to satisfy 2mm -1 <(D6s+d6s) / ((D5m+d5m)×CP6)<4mm -1 , the stray light of the sixth positioning member is improved, and the risk of stray light is reduced.

[0052] In an exemplary embodiment, the imaging system of the present application can satisfy the condition 55 < V1 x EP01 / CT1 < 75, where V1 is the Abbe number of the first lens, EP01 is the distance on the optical axis from the object side end surface of the lens barrel to the object side surface of the first positioning member, and CT1 is the center thickness of the first lens on the optical axis. By controlling the Abbe number of the first lens, the distance on the optical axis from the object side end surface of the lens barrel to the object side surface of the first positioning member, and the center thickness of the first lens on the optical axis to satisfy 55 < V1 x EP01 / CT1 < 75, the distortion contribution of each field of view of the system can be effectively brought within a reasonable range, and finally the system distortion is within 3%, and by controlling the center thickness of the first lens, the stray light between the first lens and the second lens can be effectively improved. More specifically, V1, EP01 and CT1 can satisfy 58 < V1 x EP01 / CT1 < 70. Figure 2 A schematic diagram showing that the imaging system according to an exemplary embodiment of the present application can effectively reduce the stray light between the first lens and the second lens is shown.

[0053] In an exemplary embodiment, the imaging system of the present application can satisfy the condition 24 < (DT51 + DT52) / EP45 < 33, where DT51 is the maximum effective radius of the object side surface of the fifth lens, DT52 is the maximum effective radius of the image side surface of the fifth lens, and EP45 is the distance on the optical axis from the image side surface of the fourth positioning member to the object side surface of the fifth positioning member. By controlling the ratio of the sum of the maximum effective radius of the object side surface of the fifth lens and the maximum effective radius of the image side surface of the fifth lens to the distance on the optical axis from the image side surface of the fourth positioning member to the object side surface of the fifth positioning member to be within this range, the stray light of the fifth lens and the forming stability can be effectively improved.

[0054] In an exemplary embodiment, the imaging system of the present application can satisfy the condition 1.7 < TD / D0m x (Na + Nb) < 1.9, where TD is the distance on the optical axis from the object side surface of the first lens to the image side surface of the sixth lens, D0m is the outer diameter of the image side end surface of the lens barrel, Na is the refractive index of the lens with the largest refractive index in the lens group, and Nb is the refractive index of the lens with the second largest refractive index in the lens group. By controlling the distance on the optical axis from the object side surface of the first lens to the image side surface of the sixth lens, the outer diameter of the image side end surface of the lens barrel, the refractive index of the lens with the largest refractive index in the lens group, and the refractive index of the lens with the second largest refractive index in the lens group to satisfy 1.7 < TD / D0m x (Na + Nb) < 1.9, the lens can satisfy miniaturization, while being conducive to improving assembly stability and stray light improvement space, and the lens aberration can be effectively improved.

[0055] In exemplary embodiments, the image capturing system of the present application can satisfy the condition formula -149 < f4 / (CP4+CP3) < -68, where f4 is the effective focal length of the fourth lens, CP3 is the maximum thickness of the third positioning member along the optical axis, and CP4 is the maximum thickness of the fourth positioning member along the optical axis. By controlling the ratio of the effective focal length of the fourth lens to the sum of the maximum thickness of the third positioning member along the optical axis and the maximum thickness of the fourth positioning member along the optical axis to be within the range, the imaging quality can be improved, while reducing the power of the fourth lens and reducing the error sensitivity of product manufacturing.

[0056] In exemplary embodiments, the image capturing system of the present application can satisfy the condition formula 53mm < T23 x D2m / CP2 < 216mm, where T23 is the distance on the optical axis from the image side surface of the second lens to the object side surface of the third lens, D2m is the outer diameter of the image side surface of the second positioning member, and CP2 is the maximum thickness of the second positioning member along the optical axis. By controlling the distance on the optical axis from the image side surface of the second lens to the object side surface of the third lens, the outer diameter of the image side surface of the second positioning member, and the maximum thickness of the second positioning member along the optical axis to satisfy 53mm < T23 x D2m / CP2 < 216mm, the higher-order spherical aberration can be balanced, while avoiding collision of the third lens and the fourth lens due to being too close, thereby improving the lens yield.

[0057] In exemplary embodiments, the material of the fourth positioning member and the fifth positioning member can include plastic and / or metal. On the basis of ensuring performance and main parameters, selecting plastic as the material of the fourth and fifth positioning members can reduce material cost and better control weight; selecting metal as the material can reduce deformation and has good stability, thereby reducing displacement of previous components.

[0058] In exemplary embodiments, the image capturing system of the present application can satisfy the condition formula 5 < |R6| / D3m+R7 / D3s < 50, where R6 is the curvature radius of the image side surface of the third lens, D3m is the outer diameter of the image side surface of the third positioning member, R7 is the curvature radius of the object side surface of the fourth lens, and D3s is the outer diameter of the object side surface of the third positioning member. By controlling the curvature radius of the image side surface of the third lens, the outer diameter of the image side surface of the third positioning member, the curvature radius of the object side surface of the fourth lens, and the outer diameter of the object side surface of the third positioning member to satisfy 5 < |R6| / D3m+R7 / D3s < 50, the total deflection angle of the edge field at the two surfaces can be controlled within a reasonable range, and the sensitivity of the system can be effectively reduced. More specifically, R6, D3m, R7, and D3s can satisfy 9 < |R6| / D3m+R7 / D3s < 46.

[0059] In the exemplary embodiments, the image capturing system of the present application can comprise at least one diaphragm. The diaphragm can restrict the light path and control the light intensity. In the exemplary embodiments, the image capturing system of the present application can comprise two diaphragms. The diaphragms can be arranged at appropriate positions of the image capturing system. For example, one diaphragm can be arranged between the object side and the first lens, and the other diaphragm can be arranged between the second lens and the third lens.

[0060] In the exemplary embodiments, the image capturing system can further comprise a filter for correcting color deviation and / or a protective glass for protecting the photosensitive elements on the imaging surface.

[0061] The image capturing system according to the above embodiments of the present application can comprise a lens barrel and a six-lens imaging lens group assembled in the lens barrel, and six positioning members arranged on the image side of each lens, respectively. By reasonably arranging the curvature radius of the object side surface of the third lens and the inner diameter of the image side surface of the second positioning member, and the curvature radius of the image side surface of the second lens and the inner diameter of the object side surface of the second positioning member, so that 7 < R5 / d2m+R4 / d2s<200 is satisfied, and by reasonably controlling the Abbe number of the sixth lens, the outer diameter of the object side surface of the fifth positioning member, and the curvature radius of the object side surface of the sixth lens, so that 20 < V6 x D5s / R11 < 38 is satisfied, the chromatic aberration can be better corrected, and the imaging quality of the lens can be improved. At the same time, the problem of increased tolerance sensitivity of the sixth lens caused by excessive concentration of optical power and excessive bending of the surface can also be avoided. This is conducive to achieving good imaging effect on the basis of small head and large field of view.

[0062] In the embodiments of the present application, at least one of the lens surfaces of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens can be an aspherical lens surface. That is, at least one of the object side surface of the first lens to the image side surface of the sixth lens can be an aspherical lens surface. The aspherical lens has the characteristic that the curvature continuously changes from the center of the lens to the periphery of the lens. Unlike the spherical lens which has constant curvature from the center of the lens to the periphery of the lens, the aspherical lens has better curvature radius characteristics, and has the advantages of improving the distortion aberration and improving the astigmatism aberration. After the aspherical lens is adopted, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of the object side surface and the image side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens is an aspherical lens surface. Optionally, the object side surface and the image side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are aspherical lens surfaces.

[0063] However, those skilled in the art will understand that the number of lenses constituting the image capturing system and the number of positioning members can be changed without departing from the technical solutions claimed in the present application, so as to obtain the various results and advantages described in the present specification. For example, although six lenses are described in the embodiments, the image capturing system is not limited to including six lenses. If necessary, the image capturing system can also include other numbers of lenses. For another example, although the first positioning member to the sixth positioning member are described in the embodiments, the image capturing system is not limited to including the first positioning member to the sixth positioning member as described above. If necessary, the image capturing system can also include other numbers of positioning members.

[0064] Specific embodiments of the image capturing system applicable to the above-described embodiments are further described below with reference to the accompanying drawings.

[0065] Example 1

[0066] The following describes the image capturing system according to Embodiment 1 of the present application with reference to Figures 3A to 3C and Figures 4A to 4C The image capturing system according to Embodiment 1 of the present application is described below. Figures 3A to 3C The structural schematic diagrams of the image capturing system according to Embodiment 1 of the present application in three different embodiments are respectively shown.

[0067] As shown in Figures 3A to 3C , the image capturing system includes a lens barrel P0 and, sequentially arranged along the optical axis from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6 assembled in the lens barrel P0.

[0068] The first lens E1 has positive refractive power, and the object side surface S1 is a convex surface and the image side surface S2 is a concave surface. The second lens E2 has negative refractive power, and the object side surface S3 is a convex surface and the image side surface S4 is a concave surface. The third lens E3 has negative refractive power, and the object side surface S5 is a convex surface and the image side surface S6 is a concave surface. The fourth lens E4 has negative refractive power, and the object side surface S7 is a convex surface and the image side surface S8 is a concave surface. The fifth lens E5 has positive refractive power, and the object side surface S9 is a convex surface and the image side surface S10 is a convex surface. The sixth lens E6 has negative refractive power, and the object side surface S11 is a convex surface and the image side surface S12 is a concave surface.

[0069] Table 1 shows the basic parameters of the image capturing system of Embodiment 1, wherein the units of the curvature radius and the thickness / distance are millimeters (mm).

[0070]

[0071] Table 1

[0072] In Embodiment 1, the object side surface and the image side surface of any one of the first lens E1 to the sixth lens E6 are aspherical surfaces, and the surface shape x of each aspherical surface can be defined by, but is not limited to, the following aspherical surface formula:

[0073]

[0074] wherein x is the sag of the aspherical surface at a position along the optical axis at a height h from the vertex of the aspherical surface; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the inverse of the curvature radius R in Table 1 above); k is the conic coefficient; and Ai is the correction coefficient of the i-th order of the aspherical surface. Table 2-1 and Table 2-2 below give the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for the aspherical surfaces S1 to S12 in Embodiment 1. 10 12 14 16 18 20 22 24 26 28 30 .

[0075] Face number A4 A6 A8 A10 A12 A14 A16 S1 -9.9030E-04 1.5551E-02 -7.4848E-02 2.4433E-01 -5.3762E-01 8.1720E-01 -8.7656E-01 S2 -1.8916E-02 1.6823E-02 -2.4777E-02 6.2250E-02 -1.3611E-01 2.1724E-01 -2.5037E-01 S3 -2.8801E-02 1.1958E-02 8.1651E-02 -3.7548E-01 9.8390E-01 -1.7015E+00 2.0245E+00 S4 -1.2869E-02 1.3159E-02 1.0637E-01 -8.3137E-01 3.4009E+00 -8.7321E+00 1.5032E+01 S5 -3.8887E-02 3.7903E-02 -1.0544E-01 4.2201E-02 7.4325E-01 -2.9408E+00 5.9940E+00 S6 -5.0151E-02 -3.9312E-02 4.0265E-01 -1.5045E+00 3.4189E+00 -5.2452E+00 5.6555E+00 S7 -1.0142E-01 4.9022E-02 -3.2555E-02 3.7666E-02 -6.5193E-02 8.8319E-02 -8.2507E-02 S8 -9.9420E-02 4.4376E-02 -3.2495E-02 3.3134E-02 -3.2865E-02 2.4717E-02 -1.3286E-02 S9 -1.7279E-02 -4.1284E-03 8.2162E-03 -7.0238E-03 4.4354E-03 -2.1527E-03 7.6907E-04 S10 -4.8412E-03 2.3893E-03 5.4248E-03 -5.9573E-03 3.7984E-03 -1.6206E-03 4.7187E-04 S11 -1.5946E-01 6.6683E-02 -1.4992E-02 2.1801E-04 1.1154E-03 -4.0936E-04 8.1406E-05 S12 -1.7215E-01 9.0535E-02 -3.8601E-02 1.2537E-02 -3.0423E-03 5.4816E-04 -7.3233E-05

[0076] Table 2-1

[0077] Face number A18 A20 A22 A24 A26 A28 A30 S1 6.7220E-01 -3.6974E-01 1.4462E-01 -3.9245E-02 7.0206E-03 -7.4428E-04 3.5408E-05 S2 2.0868E-01 -1.2540E-01 5.3662E-02 -1.5917E-02 3.1055E-03 -3.5809E-04 1.8471E-05 S3 -1.6933E+00 1.0034E+00 -4.1883E-01 1.2036E-01 -2.2655E-02 2.5127E-03 -1.2442E-04 S4 -1.7936E+01 1.5044E+01 -8.8490E+00 3.5752E+00 -9.4517E-01 1.4723E-01 -1.0246E-02 S5 -7.7853E+00 6.8363E+00 -4.1182E+00 1.6800E+00 -4.4398E-01 6.8605E-02 -4.7060E-03 S6 -4.3652E+00 2.4229E+00 -9.5882E-01 2.6384E-01 -4.7948E-02 5.1710E-03 -2.5048E-04 S7 5.3505E-02 -2.4249E-02 7.6411E-03 -1.6383E-03 2.2763E-04 -1.8453E-05 6.6164E-07 S8 5.0961E-03 -1.3883E-03 2.6441E-04 -3.4185E-05 2.8428E-06 -1.3649E-07 2.8612E-09 S9 -1.9776E-04 3.6097E-05 -4.5989E-06 3.9795E-07 -2.2242E-08 7.2374E-10 -1.0416E-11 S10 -9.5894E-05 1.3782E-05 -1.3974E-06 9.7822E-08 -4.4985E-09 1.2223E-10 -1.4863E-12 S11 -1.0563E-05 9.4364E-07 -5.8754E-08 2.5137E-09 -7.0621E-11 1.1751E-12 -8.7879E-15 S12 7.2378E-06 -5.2543E-07 2.7585E-08 -1.0171E-09 2.4944E-11 -3.6505E-13 2.4105E-15

[0078] Table 2-2

[0079] Exemplarily, the structural schematic diagram of the image capturing system in Embodiment 1-1 is shown in Figure 3A , the structural schematic diagram of the image capturing system in Embodiment 1-2 is shown in Figure 3B , and the structural schematic diagram of the image capturing system in Embodiment 1-3 is shown in Figure 3C ​​​​​​​​​​The imaging system according to embodiments 1-1, 1-2 and 1-3 can further include a plurality of positioning members accommodated in the lens barrel P0. For example, a first positioning member P1 disposed between the first lens E1 and the second lens E2 and in contact with the image-side surface of the first lens E1; a second positioning member P2 disposed between the second lens E2 and the third lens E3 and in contact with the image-side surface of the second lens E2; a third positioning member P3 disposed between the third lens E3 and the fourth lens E4 and in contact with the image-side surface of the third lens E3; a fourth positioning member P4 disposed between the fourth lens E4 and the fifth lens E5 and in contact with the image-side surface of the fourth lens E4; a fifth positioning member P5 disposed between the fifth lens E5 and the sixth lens E6 and in contact with the image-side surface of the fifth lens E5; and a sixth positioning member P6 disposed on the image-side of the sixth lens E6 and in contact with the image-side surface of the sixth lens.

[0080] In embodiments 1-1, 1-2 and 1-3, the relevant parameter values are shown in Table 7, respectively. In combination with the above-mentioned embodiments, the imaging system according to embodiments 1-1, 1-2 and 1-3 can further include a plurality of positioning members accommodated in the lens barrel P0. Figures 3A to 3C and Figure 1 wherein EP01 is the distance on the optical axis from the object-side end surface of the lens barrel P0 to the object-side surface of the first positioning member P1; CP2 is the maximum thickness of the second positioning member P2 along the optical axis; CP3 is the maximum thickness of the third positioning member P3 along the optical axis; CP4 is the maximum thickness of the fourth positioning member P4 along the optical axis; EP45 is the distance on the optical axis from the image-side surface of the fourth positioning member to the object-side surface of the fifth positioning member; CP6 is the maximum thickness of the sixth positioning member P6 along the optical axis; d2s is the inner diameter of the object-side surface of the second positioning member P2; D3s is the outer diameter of the object-side surface of the third positioning member P3; D5s is the outer diameter of the object-side surface of the fifth positioning member P5; d6s is the inner diameter of the object-side surface of the sixth positioning member P6; D6s is the outer diameter of the object-side surface of the sixth positioning member P6; d2m is the inner diameter of the image-side surface of the second positioning member P2; D2m is the outer diameter of the image-side surface of the second positioning member P2; D3m is the outer diameter of the image-side surface of the third positioning member P3; d4m is the inner diameter of the image-side surface of the fourth positioning member P4; d5m is the inner diameter of the image-side surface of the fifth positioning member P5; D5m is the outer diameter of the image-side surface of the fifth positioning member P5; and D0m is the outer diameter of the image-side end surface of the lens barrel P0. The units of the above-mentioned parameters shown in Table 7 are millimeters (mm).

[0081] Figure 4A The astigmatism curve of the imaging system according to embodiment 1 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 4B The distortion curve of the imaging system according to embodiment 1 is shown, which represents the distortion size values corresponding to different field angles. Figure 4C The lateral chromatic aberration curve of the imaging system according to embodiment 1 is shown, which represents the deviation of light rays on the imaging plane via the lens at different image heights. According to embodiments 1-1, 1-2 and 1-3, the lateral chromatic aberration of the imaging system is less than 0.1 mm. Figures 4A to 4CIt can be seen that the image capturing system given in Embodiment 1 can achieve good imaging quality.

[0082] Example 2

[0083] An image capturing system according to Embodiment 2 of the present application is described below with reference to Figures 5A to 5C and Figures 6A to 6C An image capturing system according to Embodiment 2 of the present application is described below with reference to Figures 5A to 5C The structural schematic diagrams of the image capturing system according to Embodiment 2 of the present application in three different embodiments are shown respectively.

[0084] As shown in Figures 5A to 5C , the image capturing system comprises a lens barrel P0 and, arranged in the lens barrel P0 in order from the object side to the image side along the optical axis, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6.

[0085] The first lens E1 has positive refractive power, the object side surface S1 thereof is a convex surface, and the image side surface S2 thereof is a concave surface. The second lens E2 has negative refractive power, the object side surface S3 thereof is a convex surface, and the image side surface S4 thereof is a concave surface. The third lens E3 has positive refractive power, the object side surface S5 thereof is a convex surface, and the image side surface S6 thereof is a convex surface. The fourth lens E4 has negative refractive power, the object side surface S7 thereof is a convex surface, and the image side surface S8 thereof is a concave surface. The fifth lens E5 has positive refractive power, the object side surface S9 thereof is a convex surface, and the image side surface S10 thereof is a convex surface. The sixth lens E6 has negative refractive power, the object side surface S11 thereof is a convex surface, and the image side surface S12 thereof is a concave surface.

[0086] Table 3 shows the basic parameters of the image capturing system of Embodiment 2, wherein the units of the curvature radii and the thicknesses / distances are millimeters (mm). Tables 4-1 and 4-2 show the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 and A32 that can be used for the aspheric surfaces S1 to S12 in Embodiment 2, wherein each aspheric surface can be defined by the formula (1) given in Embodiment 1 above. 10 12 14 16 18 20 22 24 26 28 30

[0087]

[0088] Table 3

[0089] Face number A4 A6 A8 A10 A12 A14 A16 S1 -1.3834E-03 1.2875E-02 -5.2642E-02 1.4908E-01 -2.8835E-01 3.8899E-01 -3.7303E-01 S2 -2.2371E-02 2.7152E-02 -8.5566E-02 2.7059E-01 -5.7687E-01 8.3383E-01 -8.4170E-01 S3 -3.1719E-02 4.0683E-02 -1.2785E-01 4.8676E-01 -1.2174E+00 2.0286E+00 -2.3377E+00 S4 -1.1630E-02 9.7501E-03 1.5894E-01 -1.1502E+00 4.4893E+00 -1.1077E+01 1.8417E+01 S5 -3.7370E-02 -1.6370E-02 3.3682E-01 -2.0156E+00 6.7769E+00 -1.4778E+01 2.2108E+01 S6 -4.4096E-02 -5.9313E-02 4.7326E-01 -1.6980E+00 3.7834E+00 -5.7179E+00 6.0840E+00 S7 -9.8499E-02 4.3013E-02 -1.4519E-02 1.0507E-02 -4.7341E-02 9.2476E-02 -1.0075E-01 S8 -1.0930E-01 5.7762E-02 -5.7318E-02 7.3210E-02 -7.8746E-02 6.1106E-02 -3.3608E-02 S9 -2.2722E-02 -2.0129E-03 3.7555E-03 -6.4013E-04 -4.3137E-04 1.5845E-04 2.8316E-05 S10 -6.1778E-03 7.5565E-03 -3.8702E-03 3.1784E-03 -1.5372E-03 4.1635E-04 -6.7480E-05 S11 -1.7103E-01 7.7608E-02 -2.0685E-02 2.3629E-03 4.9109E-04 -2.7077E-04 5.8485E-05 S12 -1.8389E-01 1.0154E-01 -4.4837E-02 1.4971E-02 -3.7245E-03 6.8733E-04 -9.4027E-05 ​​​​​​​​​​​

[0090] Table 4-1

[0091] Face number A18 A20 A22 A24 A26 A28 A30 S1 2.5711E-01 -1.2754E-01 4.5073E-02 -1.1058E-02 1.7881E-03 -1.7121E-04 7.3490E-06 S2 6.0351E-01 -3.0877E-01 1.1177E-01 -2.7920E-02 4.5713E-03 -4.4075E-04 1.8938E-05 S3 1.9024E+00 -1.1006E+00 4.4949E-01 -1.2654E-01 2.3344E-02 -2.5372E-03 1.2304E-04 S4 -2.1316E+01 1.7402E+01 -9.9906E+00 3.9485E+00 -1.0229E+00 1.5636E-01 -1.0689E-02 S5 -2.3308E+01 1.7483E+01 -9.2790E+00 3.4053E+00 -8.2188E-01 1.1734E-01 -7.5049E-03 S6 -4.6372E+00 2.5418E+00 -9.9312E-01 2.6968E-01 -4.8337E-02 5.1382E-03 -2.4518E-04 S7 7.0227E-02 -3.2919E-02 1.0511E-02 -2.2568E-03 3.1176E-04 -2.5017E-05 8.8540E-07 S8 1.3191E-02 -3.6934E-03 7.2923E-04 -9.8892E-05 8.7498E-06 -4.5438E-07 1.0498E-08 S9 -3.1315E-05 9.4773E-06 -1.5730E-06 1.5825E-07 -9.6247E-09 3.2618E-10 -4.7339E-12 S10 6.2254E-06 -1.7834E-07 -2.9851E-08 4.2933E-09 -2.6401E-10 8.3803E-12 -1.1210E-13 S11 -7.7816E-06 6.9848E-07 -4.3299E-08 1.8355E-09 -5.0955E-11 8.3658E-13 -6.1677E-15 S12 9.5158E-06 -7.0746E-07 3.8045E-08 -1.4372E-09 3.6126E-11 -5.4208E-13 3.6719E-15

[0092] Table 4-2

[0093] For example, a schematic diagram of the imaging system in Embodiment 2-1 is shown below. Figure 5A As shown in the figure, the structural schematic diagram of the imaging system in Example 2-2 is as follows. Figure 5B As shown, the structural schematic diagram of the imaging system in Examples 2-3 is as follows. Figure 5C As shown. According to embodiments 2-1, 2-2, and 2-3, the image-capturing system may further include a plurality of positioning members housed in the lens barrel P0. For example, a first positioning member P1 is positioned between the first lens E1 and the second lens E2 and in contact with the image-side surface of the first lens E1; a second positioning member P2 is positioned between the second lens E2 and the third lens E3 and in contact with the image-side surface of the second lens E2; a third positioning member P3 is positioned between the third lens E3 and the fourth lens E4 and in contact with the image-side surface of the third lens E3; a fourth positioning member P4 is positioned between the fourth lens E4 and the fifth lens E5 and in contact with the image-side surface of the fourth lens E4; a fifth positioning member P5 is positioned between the fifth lens E5 and the sixth lens E6 and in contact with the image-side surface of the fifth lens E5; and a sixth positioning member P6 is positioned on the image side of the sixth lens E6 and in contact with the image-side surface of the sixth lens.

[0094] The relevant parameter values ​​in Examples 2-1, 2-2 and 2-3 are shown in Table 7. The meaning of each parameter is as described above and will not be repeated here. The unit of each parameter in Table 7 is millimeters (mm).

[0095] Figure 6A The astigmatism curves of the imaging system of Embodiment 2 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 6B The distortion curve of the imaging system of Embodiment 2 is shown, which represents the distortion magnitude value corresponding to different field of view angles. Figure 6C The magnification chromatic aberration curve of the imaging system of Embodiment 2 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to Figures 6A to 6C It can be seen that the imaging system given in Example 2 can achieve good imaging quality.

[0096] Example 3

[0097] The following is for reference Figures 7A to 7C as well as Figures 8A to 8C An image acquisition system according to Embodiment 3 of this application is described. Figures 7A to 7C Schematic diagrams of the imaging system according to Embodiment 3 of this application are shown in three different implementations.

[0098] As shown in Figures 7A to 7C , the image capturing system includes a lens barrel P0 and, accommodated in the lens barrel P0, sequentially arranged along the optical axis from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6.

[0099] The first lens E1 has positive refractive power, with a convex object side surface S1 and a concave image side surface S2. The second lens E2 has negative refractive power, with a convex object side surface S3 and a concave image side surface S4. The third lens E3 has positive refractive power, with a convex object side surface S5 and a concave image side surface S6. The fourth lens E4 has negative refractive power, with a convex object side surface S7 and a concave image side surface S8. The fifth lens E5 has positive refractive power, with a convex object side surface S9 and a convex image side surface S10. The sixth lens E6 has negative refractive power, with a convex object side surface S11 and a concave image side surface S12.

[0100] Table 5 shows the basic parameters of the image capturing system of Example 3, where the units of the curvature radii and the thicknesses / distances are millimeters (mm). Tables 6-1 and 6-2 show the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, and A26 that can be used for each aspherical surface S1 to S12 in Example 3, where each aspherical surface profile can be defined by the formula (1) given in Example 1 above. 10 12 14 16 18 20 22 24 26 28 30

[0101]

[0102] Table 5

[0103]

[0104]

[0105] Table 6-1

[0106] Face number A18 A20 A22 A24 A26 A28 A30 S1 2.7975E-01 -1.4608E-01 5.4442E-02 -1.4118E-02 2.4199E-03 -2.4646E-04 1.1293E-05 S2 -2.5652E+00 1.5409E+00 -6.5862E-01 1.9532E-01 -3.8160E-02 4.4126E-03 -2.2853E-04 S3 -8.7054E-01 7.1356E-01 -3.9669E-01 1.4835E-01 -3.5785E-02 5.0318E-03 -3.1333E-04 S4 3.0247E-01 1.1755E+00 -1.4095E+00 8.2516E-01 -2.7895E-01 5.2099E-02 -4.1812E-03 S5 1.7904E+01 -1.3100E+01 6.8451E+00 -2.4871E+00 5.9602E-01 -8.4539E-02 5.3651E-03 S6 -8.8305E+00 5.0348E+00 -2.0498E+00 5.8082E-01 -1.0875E-01 1.2089E-02 -6.0377E-04 S7 1.0443E-01 -7.7885E-02 3.2736E-02 -8.6311E-03 1.4166E-03 -1.3265E-04 5.4194E-06 S8 -4.8382E-02 1.3734E-02 -2.7921E-03 3.9665E-04 -3.7419E-05 2.1067E-06 -5.3561E-08 S9 -7.5850E-04 9.9203E-05 -6.5436E-06 -9.4216E-08 5.2344E-08 -3.6713E-09 8.9171E-11 S10 4.0070E-05 3.9437E-06 -1.4256E-06 1.7360E-07 -1.1469E-08 4.0950E-10 -6.2196E-12 S11 -1.6518E-05 1.3555E-06 -8.0066E-08 3.3193E-09 -9.1622E-11 1.5104E-12 -1.1231E-14 S12 7.5633E-06 -5.7163E-07 3.1192E-08 -1.1921E-09 3.0203E-11 -4.5491E-13 3.0794E-15

[0107] Table 6-2

[0108] Exemplarily, a structure schematic diagram of the image capturing system in Example 3-1 is shown in Figure 7A , and a structure schematic diagram of the image capturing system in Example 3-2 is shown in Figure 7B ​​​​​​​​​​​As shown, the structural schematic diagram of the imaging system in embodiment 3-3 is as shown in FIG. 3-3. Figure 7C As shown. According to embodiments 3-1, 3-2 and 3-3, the imaging system can further include a plurality of positioning members accommodated in the lens barrel P0. For example, a first positioning member P1 disposed between the first lens E1 and the second lens E2 and in contact with the image side surface of the first lens E1; a second positioning member P2 disposed between the second lens E2 and the third lens E3 and in contact with the image side surface of the second lens E2; a third positioning member P3 disposed between the third lens E3 and the fourth lens E4 and in contact with the image side surface of the third lens E3; a fourth positioning member P4 disposed between the fourth lens E4 and the fifth lens E5 and in contact with the image side surface of the fourth lens E4; a fifth positioning member P5 disposed between the fifth lens E5 and the sixth lens E6 and in contact with the image side surface of the fifth lens E5, and a sixth positioning member P6 disposed on the image side of the sixth lens E6 and in contact with the image side surface of the sixth lens.

[0109] The values of the respective parameters in embodiments 3-1, 3-2 and 3-3 are shown in Table 7, respectively, wherein the meanings of the parameters are as described above and will not be repeated here, and the units of the parameters shown in Table 7 are millimeters (mm).

[0110] Figure 8A The astigmatism curves of the imaging system in embodiment 3 are shown, which represent the meridional image surface curvature and sagittal image surface curvature. Figure 8B The distortion curves of the imaging system in embodiment 3 are shown, which represent the distortion size values corresponding to different field angles. Figure 8C The lateral chromatic aberration curves of the imaging system in embodiment 3 are shown, which represent the deviations of light rays at different image heights after passing through the lens. According to Figures 8A to 8C It can be seen that the imaging system given in embodiment 3 can achieve good imaging quality.

[0111]

[0112]

[0113] Table 7

[0114] In addition, in Embodiments 1 to 3, the effective focal length f of the image capturing system, the half of the maximum field angle of the image capturing system semi-fov, the radius of curvature R4 of the image side surface of the second lens, the radius of curvature R5 of the object side surface of the third lens, the Abbe number V6 of the sixth lens, the radius of curvature Ra of the object side surface and the radius of curvature Rb of the image side surface of the lens adjacent to the object side surface of the positioning member with the smallest inner diameter in the positioning member group, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the edge thickness et5 of the fifth lens, the distance TD of the object side surface of the first lens to the image side surface of the sixth lens on the optical axis, the refractive index Na of the lens with the largest refractive index in the lens group, the refractive index Nb of the lens with the second largest refractive index in the lens group, the maximum effective radius DT51 of the object side surface of the fifth lens, the maximum effective radius DT52 of the image side surface of the fifth lens, and the effective focal length f4 of the fourth lens are respectively shown in Table 8.

[0115] Parameter / Example 1 2 3 f (mm) 6.10 6.11 6.10 semi-fov (°) 40.6 40.6 40.7 R4 (mm) 4.65 5.01 5.48 R5 (mm) 164.11 335.56 26.28 V6 55.65 56.05 56.05 Ra (mm) 11.78 13.13 17.73 Rb (mm) 4.65 5.01 5.48 f1 (mm) 5.1 5.13 5.23 f2 (mm) -11.57 -12.16 -11.87 et5 (mm) 0.36 0.35 0.44 TD (mm) 5.84 5.79 5.62 Na 1.67 1.67 1.67 Nb 1.62 1.62 1.62 DT51 (mm) 6 6.29 5.54 DT52 (mm) 6.66 6.83 6.19 f4 (mm) -48.87 -29.26 -39.17

[0116] Table 8

[0117] Embodiments 1 to 3 respectively satisfy the conditions shown in Table 9.

[0118]

[0119]

[0120] Table 9

[0121] The present application also provides an imaging device provided with an electronic photosensitive element to image, which can be a Charge Coupled Device (CCD) or a Complementary Metal Oxide Semiconductor (CMOS). The imaging device can be a separate imaging equipment such as a digital camera, or an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the image capturing system described above.

[0122] The above description is merely preferred embodiments of the present application and a description of the principles of the technology employed. It will be understood by those skilled in the art that the scope of protection of the present application is not limited to the technical solutions formed by the specific combinations of the above technical features, and should also cover other technical solutions formed by any combinations of the above technical features or their equivalent features without departing from the concept of the present application. For example, the above features are replaced with the technical features disclosed in the present application (but not limited to) with similar functions to form technical solutions.

Claims

1. An imaging system comprising a lens barrel and a lens group and a spacer group accommodated in the lens barrel, wherein the lens group comprises, in order from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, wherein the first lens has positive refractive power, an object-side surface thereof is convex, and an image-side surface thereof is concave; the second lens has negative refractive power, an object-side surface thereof is convex, and an image-side surface thereof is concave; the third lens has positive refractive power or negative refractive power, an object-side surface thereof is convex; the fourth lens has negative refractive power, an object-side surface thereof is convex, and an image-side surface thereof is concave; the fifth lens has positive refractive power, an object-side surface thereof is convex, and an image-side surface thereof is convex; and the sixth lens has negative refractive power, an object-side surface thereof is convex, and an image-side surface thereof is concave; the spacer group comprises a first spacer in contact with an image-side surface of the first lens, a second spacer in contact with an image-side surface of the second lens, a third spacer in contact with an image-side surface of the third lens, a fourth spacer in contact with an image-side surface of the fourth lens, a fifth spacer in contact with an image-side surface of the fifth lens, and a sixth spacer in contact with an image-side surface of the sixth lens; the number of lenses having refractive power in the imaging system is six; an outer diameter D6s of an object-side surface of the sixth spacer, an inner diameter d6s of the object-side surface of the sixth spacer, an outer diameter D5m of an image-side surface of the fifth spacer, an inner diameter d5m of the image-side surface of the fifth spacer, and a maximum thickness CP6 of the sixth spacer in a direction of the optical axis satisfy: 2.06 mm -1 ≤ (D6s + d6s) / ((D5m + d5m) x CP6) ≤ 3.58 mm -1 .

2. The image taking system of claim 1, wherein, an effective focal length f2 of the second lens and an effective focal length f1 of the first lens satisfy: -2.37≤f2 / f1≤-2.

27.

3. The image taking system of claim 1, wherein, a radius of curvature Ra of an object-side surface of a lens adjacent to an object-side surface of a spacer having a smallest inner diameter of image-side surfaces of the spacer group and a radius of curvature Rb of an image-side surface thereof satisfy: 2.53≤Ra / Rb≤3.

24.

4. The image taking system of claim 1, wherein, an outer diameter D5s of an object-side surface of the fifth spacer, an inner diameter d4m of an image-side surface of the fourth spacer, and an edge thickness et5 of the fifth lens satisfy: 2.47≤(D5s-d4m) / et5≤4.

54.

5. The image taking system of claim 1, wherein, an Abbe number V1 of the first lens, a distance EP01 on the optical axis from an object-side end surface of the lens barrel to an object-side surface of the first spacer, and a central thickness CT1 of the first lens on the optical axis satisfy: 59.15≤V1×EP01 / CT1≤69.

47.

6. The image taking system according to any one of claims 1 to 5, wherein, a maximum effective radius DT51 of an object-side surface of the fifth lens, a maximum effective radius DT52 of an image-side surface of the fifth lens, and a distance EP45 on the optical axis from an image-side surface of the fourth spacer to an object-side surface of the fifth spacer satisfy: 25.29≤(DT51+DT52) / EP45≤31.

03.

7. The image taking system according to any one of claims 1 to 5, wherein, A distance TD on the optical axis of an object side surface of the first lens to an image side surface of the sixth lens, an outer diameter D0m of an image side end surface of the lens barrel, a refractive index Na of a lens having the largest refractive index among the lens groups, and a refractive index Nb of a lens having the second largest refractive index among the lens groups satisfy: 1.75 ≤ TD / D0m x (Na+Nb) ≤ 1.

83.

8. The image taking system according to any one of claims 1 to 5, wherein, An effective focal length f4 of the fourth lens, a maximum thickness CP3 of the third positioning member in the direction of the optical axis, and a maximum thickness CP4 of the fourth positioning member in the direction of the optical axis satisfy: -147.36 ≤ f4 / (CP4+CP3) ≤ -69.

32.

9. The image taking system according to any one of claims 1 to 5, wherein, A distance T23 on the optical axis of an image side surface of the second lens to an object side surface of the third lens, an outer diameter D2m of an image side surface of the second positioning member, and a maximum thickness CP2 of the second positioning member in the direction of the optical axis satisfy: 54.97 mm ≤ T23 x D2m / CP2 ≤ 214.66 mm.

Images