Optical image capturing lens

Abstract

The utility model discloses an optical image capturing lens. The optical image capturing lens comprises a lens barrel, and a six-piece lens group and a positioning ring group which are arranged in the lens barrel, the six-piece type lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from the object side to the image side along the optical axis; the positive and negative attributes of the symbols of the focal power of the third lens and the fourth lens are opposite; the object side surfaces of the third lens and the fourth lens are convex surfaces; the positioning ring group comprises a third positioning ring which is arranged on the image side surface of the third lens and is in contact with the image side surface of the third lens; wherein the curvature radius R7 of the object side surface of the fourth lens and the effective focal length f4 of the fourth lens meet the formula:-0.9 lt; f4 / R7lt; 0.75, and f4 / R7 is not equal to 0; the effective focal length f3 of the third lens, the inner diameter d3s of the object side surface of the third positioning ring and the outer diameter D3s of the object side surface of the third positioning ring meet the following conditions: 0.85 lt; pi * (D3s2-d3s2) / f32lt; and 11.75% by weight.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical devices, in particular to an optical image pickup lens. BACKGROUND

[0002] In recent years, with the increasing changes in consumer demand, the requirements of optical image pickup lenses have gradually become complex and diversified. In different application scenarios, the performance of optical image pickup lenses is also different.

[0003] At present, six-piece optical image pickup lenses have become mainstream, which are widely used in mobile phones, security and protection, automobiles, unmanned aerial vehicles and other fields. The fourth lens in the six-piece optical image pickup lens is usually designed as a structure with a thick middle and a thin edge, which increases the difficulty of forming the fourth lens and increases the possibility of stray light at the position of the fourth lens, affecting the imaging quality of the optical image pickup lens, and in severe cases, it will also affect the user's experience. CONTENT OF THE UTILITY MODEL

[0004] An aspect of the present application provides an optical image pickup lens, which includes a lens barrel, a six-piece lens group and a positioning ring group arranged in the lens barrel; the six-piece lens group includes 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 third lens and the fourth lens have opposite positive and negative properties of the sign of the optical power; the object side surface of the third lens and the fourth lens is a convex surface; the positioning ring group includes a third positioning ring arranged on the image side surface of the third lens and in contact with the image side surface of the third lens; wherein the curvature radius R7 of the object side surface of the fourth lens and the effective focal length f4 of the fourth lens satisfy: -0.9 < f4 / R7 < 0.75, and f4 / R7 ≠ 0; the effective focal length f3 of the third lens, the inner diameter d3s of the object side surface of the third positioning ring and the outer diameter D3s of the object side surface of the third positioning ring satisfy: 0.85 < π × (D3s2-d3s2) / f3 2 < 11.75.

[0005] According to an example embodiment of the present application, the refractive index N3 of the third lens, the refractive index N4 of the fourth lens, the inner diameter d3m of the image side surface of the third positioning ring and the outer diameter D3m of the image side surface of the third positioning ring satisfy: 1.4 < N4 / N3 × (D3m / d3m) < 2.3.

[0006] According to an example embodiment of the present application, the positioning ring group further includes a first positioning ring arranged on the image side surface of the first lens and in contact with the image side surface of the first lens, wherein half of the maximum field of view angle Semi-FOV of the optical image pickup lens, the inner diameter d0s of the object side end surface of the lens barrel and the inner diameter d1s of the object side surface of the first positioning ring satisfy: 2.25 < tan(Semi-FOV) × d0s / d1s < 2.85.

[0007] According to an example embodiment of the present application, the positioning ring set further comprises a second positioning ring disposed on and in contact with the image side surface of the second lens, wherein the total effective focal length f of the optical image taking lens, the effective focal length f3 of the third lens, the inner diameter d2m of the image side surface of the second positioning ring, and the outer diameter D2m of the image side surface of the second positioning ring satisfy: 1 < D2m / d2m x |f3| / f < 7.2.

[0008] According to an example embodiment of the present application, the positioning ring set further comprises a first positioning ring disposed on and in contact with the image side surface of the first lens and a second positioning ring disposed on and in contact with the image side surface of the second lens, wherein the central thickness CT2 of the second lens along the optical axis, the refractive index N2 of the second lens, and the distance EP12 of the first positioning ring and the second positioning ring along the optical axis satisfy: 0.95 < EP12 / CT2 x N2 < 1.7.

[0009] According to an example embodiment of the present application, the positioning ring set further comprises a second positioning ring disposed on and in contact with the image side surface of the second lens, wherein the air separation T23 of the second lens and the third lens along the optical axis, the central thickness CT3 of the third lens along the optical axis, the maximum thickness CP2 of the second positioning ring along the optical axis, and the distance EP23 of the second positioning ring and the third positioning ring along the optical axis satisfy: 0.05 < CP2 / EP23 x T23 / CT3 < 0.3.

[0010] According to an example embodiment of the present application, the positioning ring set further comprises a fourth positioning ring disposed on and in contact with the image side surface of the fourth lens, wherein the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, the radius of curvature R8 of the image side surface of the fourth lens, and the inner diameter d4s of the object side surface of the fourth positioning ring satisfy: -1 < d4s / R8 x f3 / f4 < 5.15, and d4s / R8 x f3 / f4 ≠ 0.

[0011] According to an example embodiment of the present application, the positioning ring set further comprises a fourth positioning ring disposed on and in contact with the image side surface of the fourth lens, wherein the distance EP34 of the third positioning ring and the fourth positioning ring along the optical axis, and the on-axis distance SAG41 between the intersection of the object side surface of the fourth lens and the optical axis and the maximum effective radius vertex of the object side surface of the fourth lens satisfy: -10.05 < EP34 / SAG41 < 60.5, and EP34 / SAG41 ≠ 0.

[0012] According to an example embodiment of the present application, the positioning ring set further comprises a fifth positioning ring placed on and in contact with the image side surface of the fifth lens, the reflectivity of the fifth positioning ring to light in the visible light range is less than or equal to 3%, wherein the maximum thickness CP5 of the fifth positioning ring along the optical axis direction, the inner diameter d5s of the object side surface of the fifth positioning ring and the outer diameter D5s of the object side surface of the fifth positioning ring satisfy: 1<(D5s-d5s) / CP5<137.35.

[0013] According to an example embodiment of the present application, the refractive index N1 of the first lens, the refractive index N2 of the second lens, the refractive index N3 of the third lens, the refractive index N4 of the fourth lens, the refractive index N5 of the fifth lens and the refractive index N6 of the sixth lens satisfy: 0.95<(N1+N3+N5) / (N2+N4+N6)<1.1.

[0014] The optical image taking lens provided by the present application adopts six lenses, wherein the fourth lens is usually designed as a structure of middle thin edge thick, which increases the difficulty of forming the fourth lens and increases the possibility of generating stray light at the position of the fourth lens. By respectively restricting f4 / R7 and π×(D3s^2-d3s^2) / f3^2 within a reasonable range, the surface shape of the object side surface of the fourth lens can be effectively restricted, so that the surface shape curve of the object side surface of the fourth lens is gentle, the sol gel wavefront curve is relatively gentle when injection molding, there is no convergence wrapping phenomenon, the risk of weld marks of the fourth lens is reduced, and thus the stray light generated by the weld marks is reduced; meanwhile, by limiting the inner diameter and the outer diameter of the third positioning ring, the third positioning ring can effectively intercept the reflected light path, further reducing the stray light of the optical image taking lens and improving the imaging quality of the optical image taking lens. BRIEF DESCRIPTION OF DRAWINGS

[0015] Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting examples made with reference to the accompanying drawings, in which:

[0016] Figure 1 A parameter labeling diagram of the optical image taking lens according to the present application is shown;

[0017] Figure 2A The stray light simulation diagram of the optical image taking lens when f4 / R7=0.6 and π×(D3s^2-d3s^2) / f3^2=11.3 is shown;

[0018] Figure 2B The stray light simulation diagram of the optical image taking lens when f4 / R7=-0.5 and π×(D3s^2-d3s^2) / f3^2=15 is shown;

[0019] Figure 2CThe stray light simulation diagram of the optical image capturing lens satisfying f4 / R7=-0.3 and π×(D3s^2-d3s^2) / f3^2=0.4;

[0020] Figure 3 A structure diagram of an optical image capturing lens according to Embodiment 1 of the present application is shown.

[0021] Figure 4 A structure diagram of an optical image capturing lens according to Embodiment 2 of the present application is shown.

[0022] Figure 5A Figure 5B Figure 5C Axial chromatic aberration curves, astigmatism curves and distortion curves of the optical image capturing lens according to Embodiment 1 or 2 of the present application are shown respectively.

[0023] Figure 6 A structure diagram of an optical image capturing lens according to Embodiment 3 of the present application is shown.

[0024] Figure 7 A structure diagram of an optical image capturing lens according to Embodiment 4 of the present application is shown.

[0025] Figure 8A Figure 8B Figure 8C Axial chromatic aberration curves, astigmatism curves and distortion curves of the optical image capturing lens according to Embodiment 3 or 4 of the present application are shown respectively.

[0026] Figure 9 A structure diagram of an optical image capturing lens according to Embodiment 5 of the present application is shown.

[0027] Figure 10 A structure diagram of an optical image capturing lens according to Embodiment 6 of the present application is shown.

[0028] Figure 11A Figure 11B Figure 11C Axial chromatic aberration curves, astigmatism curves and distortion curves of the optical image capturing lens according to Embodiment 5 or 6 of the present application are shown respectively. DETAILED DESCRIPTION

[0029] For a better understanding of the present application, various aspects of the present application will be described in more 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 is not intended to limit the scope of the present application in any way. Throughout the specification, same reference numerals refer to same elements.

[0030] ​​​​​​It should be noted that the terms first, second, third, etc. in the present description are used only for distinguishing one feature from another, and do not denote any limitation. Thus, a first lens discussed below could also be termed a second lens or a third lens without departing from the teachings of the present application.

[0031] In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for the sake of explanation. Specifically, the shape of the spherical or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0032] In the present description, 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 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 image plane is referred to as the image side surface of the lens.

[0033] It should also be understood that the words "comprise", "have" and / or "include" 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. Furthermore, when describing the embodiments of the present application, the word "may" is used to mean "one or more embodiments of the present application". Also, the word "exemplary" is intended to mean an example or an illustration.

[0034] 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 will be further understood that terms, such as those defined in commonly used dictionaries, 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 overly literal or overly formal sense unless expressly so defined herein.

[0035] 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 present application will be described in detail below with reference to the drawings and in conjunction with embodiments.

[0036] Figure 1 The structure arrangement and part parameters of the optical image taking lens according to the exemplary embodiments of the present application are shown in the following tables. The structure arrangement and part parameters of the optical image taking lens according to the exemplary embodiments of the present application are shown in the following tables. Figure 1, d1s represents an inner diameter of an object side surface of the first positioning ring, d2m represents an inner diameter of an image side surface of the second positioning ring, D2m represents an outer diameter of the image side surface of the second positioning ring, d3s represents an inner diameter of an object side surface of the third positioning ring, d3m represents an inner diameter of an image side surface of the third positioning ring, D3s represents an outer diameter of the object side surface of the third positioning ring, D3m represents an outer diameter of the image side surface of the third positioning ring, d4s represents an inner diameter of an object side surface of the fourth positioning ring, d5s represents an inner diameter of an object side surface of the fifth positioning ring, D5s represents an outer diameter of the object side surface of the fifth positioning ring, d0s represents an inner diameter of an object side end surface of the lens barrel, EP12 represents a distance along the optical axis of the first positioning ring and the second positioning ring, CP2 represents a maximum thickness of the second positioning ring in the direction of the optical axis, EP23 represents a distance along the optical axis of the second positioning ring and the third positioning ring, EP34 represents a distance along the optical axis of the third positioning ring and the fourth positioning ring, and CP5 represents a maximum thickness of the fifth positioning ring in the direction of the optical axis.

[0037] With reference to Figure 3 , Figure 4 , Figure 6 , Figure 7 , Figure 9 and Figure 10 , a first aspect of the present application provides such an optical image capturing lens. The optical image capturing lens can include a lens barrel and a positioning ring set disposed in the lens barrel. The positioning ring set can include a third positioning ring disposed on an image side of the third lens and at least partially in contact with the image side of the third lens.

[0038] In one embodiment, the radius of curvature R7 of the object side surface of the fourth lens and the effective focal length f4 of the fourth lens may satisfy: -0.9 < f4 / R7 < 0.75, and f4 / R7 ≠ 0; the effective focal length f3 of the third lens, the inner diameter d3s and the outer diameter D3s of the object side surface of the third positioning ring may satisfy: 0.85 < π×(D3s^2 - d3s^2) / f3^2 < 11.75. The fourth lens is usually designed in a structure with a thinner middle and thicker edges, which increases the forming difficulty of the fourth lens and the possibility of stray light generation at the position of the fourth lens. By controlling the ratio of the effective focal length of the fourth lens to the radius of curvature of the object side surface of the fourth lens, the surface shape of the object side surface of the fourth lens can be effectively constrained, making the surface shape curve trend of the object side surface of the fourth lens gentle. When injection molding, the sol wavefront curve is relatively gentle, without the phenomenon of convergence and wrapping, reducing the risk of weld lines on the fourth lens, and further reducing the stray light generated by the weld lines; at the same time, by restricting the inner and outer diameters of the third positioning ring, the third positioning ring can effectively intercept the reflected light path, further reducing the stray light of the optical imaging lens and improving the imaging quality of the optical imaging lens.

[0039] Figure 2A FIG. is the stray light simulation diagram of the optical imaging lens when f4 / R7 = 0.6 and π×(D3s^2 - d3s^2) / f3^2 = 11.3, that is, when 0.5 < π×(D3s^2 - d3s^2) / f3^2 < 13. When the optical imaging lens does not satisfy 0.5 < π×(D3s^2 - d3s^2) / f3^2 < 13, for example Figure 2B FIG. is the stray light simulation diagram of the optical imaging lens under the conditions of f4 / R7 = -0.5 and π×(D3s^2 - d3s^2) / f3^2 = 15. Figure 2C FIG. is the stray light simulation diagram of the optical imaging lens under the conditions of f4 / R7 = -0.3 and π×(D3s^2 - d3s^2) / f3^2 = 0.4. Figure 2B and Figure 2C the obvious stray light phenomenon exists in the optical imaging lens shown in Figure 2A while the stray light phenomenon of the optical imaging lens shown in Figure 2A is clearly improved. It can be seen that by regulating the optical imaging lens to satisfy "-0.9 < f4 / R7 < 0.75, and f4 / R7 ≠ 0" and "0.85 < π×(D3s^2 - d3s^2) / f3^2 < 11.75", the stray light phenomenon of the optical imaging lens can be effectively improved, thereby improving the imaging quality of the optical imaging lens.

[0040] In an exemplary embodiment, the positioning ring group may include one or more of the first positioning ring, the second positioning ring, the third positioning ring, the fourth positioning ring and the fifth positioning ring. Reasonable use of the positioning ring can effectively avoid the risk of stray light, reduce the interference to the image quality, and further improve the imaging quality of the optical imaging lens.

[0041] In an example embodiment, the lens barrel can include an object-side end surface, an image-side end surface, an outer annular surface, and an inner annular surface, wherein the end surface of the lens barrel closest to the object side is the object-side end surface of the lens barrel, and the end surface of the lens barrel closest to the image side is the image-side end surface of the lens barrel; in a direction perpendicular to the optical axis, the surface of the lens barrel farthest from the optical axis is the outer annular surface, and the surface of the lens barrel closest to the optical axis is the inner annular surface.

[0042] In an example embodiment, the optical imaging lens can include a diaphragm disposed between the second lens and the third lens.

[0043] In an example embodiment, the positioning ring set can include a third positioning ring, wherein the third positioning ring can be disposed on and at least partially in contact with the image-side surface of the third lens. The refractive index N3 of the third lens, the refractive index N4 of the fourth lens, the inner diameter d3m of the image-side surface of the third positioning ring, and the outer diameter D3m of the image-side surface of the third positioning ring can satisfy: 1.4 < N4 / N3 x (D3m / d3m) < 2.3. By controlling the above condition, the third lens and the fourth lens can have a higher refractive index, ensuring that the third lens and the fourth lens can diverge the light rays from the second lens into a larger angle under the effective space of the optical imaging lens, and ensuring that the optical imaging lens can achieve a large image surface under a smaller total optical length.

[0044] In an example embodiment, the positioning ring set can include a first positioning ring, wherein the first positioning ring can be disposed on and at least partially in contact with the image-side surface of the first lens. The half of the maximum field of view angle Semi-FOV of the optical imaging lens, the inner diameter d0s of the object-side end surface of the lens barrel, and the inner diameter d1s of the object-side surface of the first positioning ring can satisfy: 2.25 < tan(Semi-FOV) x d0s / d1s < 2.85. By controlling the above condition, while ensuring that the field of view angle of the optical imaging lens meets the design requirements, the ratio of the inner diameter of the object-side end surface of the lens barrel to the inner diameter of the object-side surface of the first positioning ring can be constrained within a reasonable range, so that the object-side end surface of the lens barrel can block the light rays irradiated to the non-effective diameter portion of the first lens, and the stray light generated by the first lens is intercepted by the first positioning ring, reducing the risk of stray light of the optical imaging lens and improving the imaging quality of the optical imaging lens.

[0045] In an example embodiment, the positioning ring set can include a second positioning ring, wherein the second positioning ring can be disposed on and at least partially in contact with the image side surface of the second lens. The total effective focal length f of the optical image-taking lens, the effective focal length f3 of the third lens, the inner diameter d2m of the image side surface of the second positioning ring, and the outer diameter D2m of the image side surface of the second positioning ring can satisfy: 1 < D2m / d2m x |f3| / f < 7.2. By controlling the above condition, the inner diameter of the image side surface of the second positioning ring can be constrained within a reasonable range, ensuring that the Fno of the optical image-taking lens satisfies the design requirements; meanwhile, by limiting the outer diameter of the image side surface of the second positioning ring, the length of the non-effective diameter part of the third lens can be reduced, the fragment rate of the third lens in the die casting process can be reduced, the stress of the edge of the effective diameter part of the third lens can be reduced, and the assembly stability of the third lens can be improved.

[0046] In an example embodiment, the positioning ring set can include a first positioning ring and a second positioning ring, wherein the first positioning ring can be disposed on and at least partially in contact with the image side surface of the first lens, and the second positioning ring can be disposed on and at least partially in contact with the image side surface of the second lens. The center thickness CT2 of the second lens on the optical axis, the refractive index N2 of the second lens, and the distance EP12 of the first positioning ring and the second positioning ring along the optical axis can satisfy: 0.95 < EP12 / CT2 x N2 < 1.7. By controlling the above condition, the ratio of the edge thickness to the middle thickness of the second lens can be constrained within a reasonable range, ensuring that the second lens has good processability, and effectively ensuring the accuracy of the abutting position of the two adjacent lenses after assembly, so that the optical parameters of the optical image-taking lens satisfy the design requirements, and meanwhile, the effective diameter surfaces of the two adjacent lenses after assembly can be prevented from interfering in the direction of the optical axis, avoiding abnormal problems in appearance and performance of the lenses caused thereby, and improving the appearance and performance yield of the optical image-taking lens.

[0047] In an example embodiment, the positioning ring set can include a second positioning ring and a third positioning ring, wherein the second positioning ring can be disposed on and at least partially in contact with the image side surface of the second lens, and the third positioning ring can be disposed on and at least partially in contact with the image side surface of the third lens. The air gap T23 of the second lens and the third lens on the optical axis, the center thickness CT3 of the third lens on the optical axis, the maximum thickness CP2 of the second positioning ring in the direction of the optical axis, and the distance EP23 of the second positioning ring and the third positioning ring along the optical axis can satisfy: 0.05 < CP2 / EP23 x T23 / CT3 < 0.3. By controlling the above condition, the edge thickness and the middle thickness of the third lens can be constrained within a reasonable range, improving the forming yield of the third lens, and meanwhile, by limiting the maximum thickness of the second positioning ring, the surface profile curve trend of the object side surface of the third lens can be gentle, which is beneficial to the forming of the third lens.

[0048] In an example embodiment, the set of positioning rings can include a fourth positioning ring, wherein the fourth positioning ring can be disposed on and at least partially in contact with an image side surface of the fourth lens. An effective focal length f3 of the third lens, an effective focal length f4 of the fourth lens, a radius of curvature R8 of the image side surface of the fourth lens, and an inner diameter d4s of an object side surface of the fourth positioning ring can satisfy: -1 < d4s / R8 x f3 / f4 < 5.15, and d4s / R8 x f3 / f4 ≠ 0. By controlling the above condition, the radius of curvature of the image side surface of the fourth lens can be constrained within a certain range, so that the concave-convex degree of the image side surface of the fourth lens is reasonable, the exit angle and exit range of light rays exiting from the image side surface of the fourth lens are reasonable, and the imaging effect of the optical imaging lens is improved. At the same time, by limiting the inner diameter of the object side surface of the fourth positioning ring, the stray light generated by the fourth positioning ring can be blocked, the risk of stray light of the optical imaging lens is reduced, and the imaging quality of the optical imaging lens is improved.

[0049] In an example embodiment, the set of positioning rings can include a third positioning ring and a fourth positioning ring, wherein the third positioning ring can be disposed on and at least partially in contact with an image side surface of the third lens, and the fourth positioning ring can be disposed on and at least partially in contact with an image side surface of the fourth lens. A distance EP34 along the optical axis between the third positioning ring and the fourth positioning ring and an on-axis distance SAG41 between an intersection of the object side surface of the fourth lens and the optical axis and a maximum effective radius vertex of the object side surface of the fourth lens can satisfy: -10.05 < EP34 / SAG41 < 60.5, and EP34 / SAG41 ≠ 0. When the thickness of the third positioning ring is large, the formability of the third positioning ring is poor. When the thickness of the third positioning ring is small, the third positioning ring is prone to deformation, thereby affecting the assembly stability of the lens adjacent to the third positioning ring. The on-axis distance between the intersection of the object side surface of the fourth lens and the optical axis and the maximum effective radius vertex of the object side surface of the fourth lens indirectly determines the maximum thickness of the third positioning ring. By controlling the above condition, the maximum thickness of the third positioning ring can be constrained within a reasonable range, thereby ensuring good formability of the third positioning ring and improving the assembly stability of the lens adjacent to the third positioning ring.

[0050] In an exemplary embodiment, the positioning ring set can include a fifth positioning ring, wherein the fifth positioning ring can be disposed on and at least partially in contact with the image side surface of the fifth lens. The reflectivity of the fifth positioning ring to light in the visible light range is less than or equal to 3%. The maximum thickness CP5 of the fifth positioning ring along the optical axis direction, the inner diameter d5s of the object side surface of the fifth positioning ring, and the outer diameter D5s of the object side surface of the fifth positioning ring can satisfy: 1 < (D5s-d5s) / CP5 < 137.35. In order to achieve a large image surface of the optical image taking lens, the air gap between the fifth lens and the sixth lens is usually large, which increases the probability of light emitted from the fifth lens being incident to the inner diameter surface of the fifth positioning ring, and the probability of stray light caused by the incidence to the inner diameter surface of the fifth positioning ring. By controlling the ratio of the difference between the outer diameter and the inner diameter of the fifth positioning ring to the maximum thickness of the fifth positioning ring, the shape of the fifth positioning ring can be reasonably constrained, the generation of reflected light paths is reduced, and the reflectivity of the fifth positioning ring to light in the visible light range is less than or equal to 3% through surface treatment, further reducing the stray light problem caused by unavoidable reflected light paths.

[0051] In an exemplary embodiment, the refractive index N1 of the first lens, the refractive index N2 of the second lens, the refractive index N3 of the third lens, the refractive index N4 of the fourth lens, the refractive index N5 of the fifth lens, and the refractive index N6 of the sixth lens can satisfy: 0.95 < (N1+N3+N5) / (N2+N4+N6) < 1.1. The first lens is the first lens in the optical image taking lens that plays a role in diverging light, and the third lens or the fourth lens also plays a role in diverging light. By controlling the above condition, the first lens, the third lens, and the fourth lens can have a higher refractive index, thereby maximizing the divergence of light to achieve the characteristics of wide angle and large image surface of the optical image taking lens; and by cooperating with the limitation of the refractive index of other lenses, the volume of the optical image taking lens can be compressed to realize the miniaturization of the optical image taking lens.

[0052] In an exemplary embodiment, half of the maximum field angle of view Semi-FOV of the optical image taking lens can satisfy: 52.0° ≤ Semi-FOV ≤ 54.5°. Reasonably configuring the maximum field angle of view of the optical image taking lens can enable the optical image taking lens to achieve the characteristics of wide angle and large image surface.

[0053] The optical image taking lens according to the above embodiments of the present application can adopt six lenses and at least one positioning ring. By reasonably allocating the parameters of each lens, each positioning ring, and the lens barrel, the miniaturization, wide angle, and large image surface of the optical image taking lens can be achieved, the risk of stray light of the optical image taking lens is reduced, and the processability, formability, assembly stability, and imaging quality of the optical image taking lens are improved.

[0054] It should be understood that the present application focuses on the performance optimization of a six-piece optical image pickup lens, and in particular, the present application focuses on how to overcome the problems such as poor formability of the fourth lens, easy generation of stray light at the position of the fourth lens, or easy generation of stray light at other lens positions, or how to achieve wide angle, assembly stability, etc. The specific power distribution of the six-piece lens and the surface setting of each lens are not the focus of the present application, and these settings can be adjusted accordingly as needed. That is, although several specific power distributions and surface settings of the lens group are shown in the embodiments of the present application, it should be understood that these embodiments are only exemplary, and the lens group in the present application should not be limited to the several specific cases shown in the embodiments, but should be widely understood as a six-piece lens group with the fourth lens being a middle thin edge thick structure.

[0055] In the embodiments of the present application, at least one of the surfaces of each lens in the first lens to the sixth lens is a non-spherical surface. The characteristic of the non-spherical lens is that the curvature is continuously changed from the center of the lens to the periphery of the lens. Unlike the spherical lens which has a constant curvature from the center of the lens to the periphery of the lens, the non-spherical lens has better curvature radius characteristics, has the advantages of improving distortion aberration and improving astigmatism aberration. After using the non-spherical 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 second lens to the sixth lens are non-spherical surfaces.

[0056] Reference Figure 3 , Figure 4 , Figure 6 , Figure 7 , Figure 9 and Figure 10 , the second aspect of the present application provides an optical image pickup lens, which includes a lens barrel, a six-piece lens group and a positioning ring group arranged in the lens barrel. The six-piece lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens arranged in order from the object side to the image side along the optical axis; the signs of the optical powers of the third lens and the fourth lens are opposite in positive and negative properties; the object side surface of the third lens and the fourth lens is convex. The positioning ring group includes a third positioning ring arranged on the image side surface of the third lens and in contact with the image side surface of the third lens.

[0057] The refractive index N3 of the third lens, the refractive index N4 of the fourth lens, the inner diameter d3m of the image side surface of the third positioning ring, and the outer diameter D3m of the image side surface of the third positioning ring satisfy 1.4 < N4 / N3 x (D3m / d3m) < 2.3. By controlling the above condition, the third lens and the fourth lens can have a higher refractive index, so that the third lens and the fourth lens can diverge the light rays from the second lens into a larger angle under the effective space of the optical imaging lens, and the optical imaging lens can achieve a large image surface under a smaller total optical length.

[0058] Those skilled in the art should understand that the number of lenses and positioning rings constituting the optical imaging lens can be changed without departing from the technical solutions claimed in the present application, to obtain the various results and advantages described in the present specification.

[0059] The specific embodiments of the optical imaging lens applicable to the above embodiments are further described below with reference to the accompanying drawings.

[0060] Example 1

[0061] The following refers to Figure 3 The optical imaging lens according to Embodiment 1 of the present application is described.

[0062] As Figure 3 shown, the optical imaging lens includes a lens barrel P0 and a six-lens group and a positioning ring group disposed in the lens barrel P0. The six-lens group includes, 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. A stop STO can be disposed between the second lens E2 and the third lens E3. The positioning ring group includes a first positioning ring P1, a second positioning ring P2, a third positioning ring P3, a fourth positioning ring P4, and a fifth positioning ring P5. The positioning ring can block the excess light rays in the imaging process from entering the next lens, and at the same time make the lens better abut against the lens barrel P0, thereby enhancing the structural stability of the optical imaging lens.

[0063] The first lens E1 has negative refractive power, with a convex object side surface S1 and a concave image side surface S2. The second lens E2 has positive refractive power, with a convex object side surface S3 and a convex image side surface S4. The third lens E3 has negative refractive power, with a convex object side surface S5 and a concave image side surface S6. The fourth lens E4 has positive refractive power, with a convex object side surface S7 and a convex image side surface S8. The fifth lens E5 has negative refractive power, with a convex object side surface S9 and a concave 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. The filter has an object side surface S13 (not shown) and an image side surface S14 (not shown). Light from an object passes through the surfaces S1-S14 in sequence and is ultimately imaged on an image plane S15 (not shown).

[0064] Table 1 shows the basic parameter table of the optical image taking lens of Example 1, wherein the units of the radius of curvature, thickness / distance, focal length are all millimeters (mm).

[0065]

[0066]

[0067] Table 1

[0068] In this embodiment, the total effective focal length f of the optical image taking lens is 2.26 mm, and the half of the maximum field of view angle Semi-FOV of the optical image taking lens is 52.0°.

[0069] In this embodiment, the object side surface and the image side surface of any one of the second lens E2 to the sixth lens E6 are aspherical surfaces, and each aspherical surface can be defined by, but not limited to, the following aspherical surface formula:

[0070]

[0071] 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 radius of curvature 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 shows the high order term coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspherical surface S3-S12 in Example 1.

[0072] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S3 -1.1077E-01 1.8080E-01 -3.7677E+00 2.8511E+01 -1.3667E+02 4.0915E+02 -7.4666E+02 7.5841E+02 -3.2851E+02 S4 -1.7820E-01 9.7515E-01 -6.0553E+00 2.3975E+01 -7.2089E+01 1.5811E+02 -2.3149E+02 1.9855E+02 -7.4874E+01 S5 -3.9883E-01 2.2254E+00 -1.4430E+01 8.4494E+01 -3.7390E+02 1.1172E+03 -2.0923E+03 2.2087E+03 -1.0011E+03 S6 -5.3041E-01 1.7579E+00 -8.4540E+00 4.1767E+01 -1.6168E+02 4.2371E+02 -6.9354E+02 6.3780E+02 -2.5121E+02 S7 -9.3313E-02 1.1609E-01 -1.7593E-01 8.6522E-02 2.8139E-01 -6.8945E-01 6.6516E-01 -2.5089E-01 1.1975E-02 S8 4.7735E-02 -3.6099E-02 -4.1695E-02 1.4966E-01 -6.4723E-01 1.7100E+00 -2.2608E+00 1.4675E+00 -3.7353E-01 S9 -4.2607E-01 6.6242E-01 -1.5900E+00 3.7625E+00 -8.2759E+00 1.3397E+01 -1.3556E+01 7.5740E+00 -1.7901E+00 S10 -6.0306E-01 9.4610E-01 -1.5806E+00 2.0698E+00 -2.0706E+00 1.6054E+00 -9.1796E-01 3.2672E-01 -5.3308E-02 S11 -2.2680E-01 1.9008E-02 -1.5984E-01 4.8132E-01 -6.3597E-01 4.6482E-01 -1.9055E-01 4.0996E-02 -3.6124E-03 S12 -1.1780E-01 -1.3004E-01 2.1566E-01 -1.8190E-01 9.6370E-02 -3.3527E-02 7.4258E-03 -9.4998E-04 5.2864E-05

[0073] Table 2

[0074] Example 2

[0075] The following will be described with reference toFigure 4 An optical imaging lens according to embodiment 2 of the present application is described.

[0076] like Figure 4 As shown, the optical imaging lens includes a lens barrel P0, a six-lens assembly, and a positioning ring assembly positioned within the barrel. The six-lens assembly includes, 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. A stop STO may be positioned between the second lens E2 and the third lens E3. The positioning ring assembly includes a first positioning ring P1, a second positioning ring P2, a third positioning ring P3, a fourth positioning ring P4, and a fifth positioning ring P5.

[0077] The structure of the lens of this embodiment is the same as that of the lens of Example 1. That is, the basic parameter table of the optical imaging lens of this embodiment is the same as Table 1, and the aspheric coefficient table is the same as Table 2. This embodiment differs from Example 1 in that the structural dimensions of some components in the lens barrel P0, the first positioning ring P1, the second positioning ring P2, the third positioning ring P3, the fourth positioning ring P4, and the fifth positioning ring P5 are different.

[0078] Figure 5A The axial chromatic aberration curves of the optical imaging lenses of Examples 1 and 2 are shown, which indicate the deviation of the focal point of light of different wavelengths after passing through the optical imaging lenses. Figure 5B The astigmatism curves of the optical imaging lenses of Examples 1 and 2 are shown, which represent the meridional image curvature and sagittal image curvature corresponding to different field angles. Figure 5C The distortion curves of the optical imaging lenses of Examples 1 and 2 are shown, which represent the distortion values ​​corresponding to different field angles. Figure 5A 、 Figure 5B 、 Figure 5C It can be seen that the optical imaging lenses provided in Examples 1 and 2 can achieve good imaging quality.

[0079] Example 3

[0080] The following reference Figure 6 The optical imaging lens according to Example 3 of the present application is described.

[0081] like Figure 6As shown, the optical image capturing lens includes a lens barrel P0, and a six-piece lens group and a positioning ring group disposed in the lens barrel P0. The six-piece lens group includes, 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. A stop STO can be disposed between the second lens E2 and the third lens E3. The positioning ring group includes a first positioning ring P1, a second positioning ring P2, a third positioning ring P3, a fourth positioning ring P4, and a fifth positioning ring P5. The positioning rings can block excess light rays during imaging from entering the next lens, while allowing the lens to better abut against the lens barrel P0, thereby enhancing the structural stability of the optical image capturing lens.

[0082] The first lens E1 has a negative refractive power, with a convex object side surface S1 and a concave image side surface S2. The second lens E2 has a positive refractive power, with a convex object side surface S3 and a concave image side surface S4. The third lens E3 has a positive refractive power, with a convex object side surface S5 and a convex image side surface S6. The fourth lens E4 has a negative refractive power, with a convex object side surface S7 and a concave image side surface S8. The fifth lens E5 has a positive refractive power, with a convex object side surface S9 and a convex image side surface S10. The sixth lens E6 has a negative refractive power, with a convex object side surface S11 and a concave image side surface S12. The filter has an object side surface S13 (not shown) and an image side surface S14 (not shown). Light from an object passes through the surfaces S1-S14 in order and is ultimately imaged on an imaging surface S15 (not shown).

[0083] Table 3 shows a basic parameter table of the optical image capturing lens of embodiment 3, where the units of the radius of curvature, thickness / distance, focal length are all millimeters (mm).

[0084]

[0085]

[0086] Table 3

[0087] In this embodiment, the total effective focal length f of the optical image capturing lens is 2.34 mm, and the half of the maximum field of view angle Semi-FOV of the optical image capturing lens is 52.5°.

[0088] In this embodiment, the object side surface and the image side surface of any one of the second lens E2 to the sixth lens E6 are aspherical surfaces. Table 4 shows the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 of the aspherical surfaces S3-S12 that can be used in embodiment 3.

[0089] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S3 5.4491E-02 -6.6170E-01 -1.4960E+00 2.5851E+01 -1.2912E+02 3.4607E+02 -5.1299E+02 3.8495E+02 -1.0810E+02 S4 -1.5884E-01 -5.1310E-01 9.2431E-01 3.3204E+01 -3.6672E+02 1.8354E+03 -4.9235E+03 6.8577E+03 -3.8988E+03 S5 -8.4142E-02 1.5009E-01 -5.5668E+00 5.5142E+01 -3.1334E+02 1.0903E+03 -2.2799E+03 2.6267E+03 -1.2841E+03 S6 3.9538E-02 -1.3740E-01 2.2793E-01 -2.6376E-01 -9.3482E-03 1.4472E+00 -3.6007E+00 3.5424E+00 -1.2287E+00 S7 -1.8324E-01 3.6982E-01 -1.4639E+00 4.2100E+00 -7.5018E+00 8.5061E+00 -6.1657E+00 2.6292E+00 -4.9688E-01 S8 -4.2691E-01 1.0943E+00 -3.0857E+00 6.7251E+00 -1.0130E+01 1.0152E+01 -6.4528E+00 2.3489E+00 -3.7252E-01 S9 -1.4225E-01 5.3850E-01 -1.3950E+00 2.5779E+00 -3.3009E+00 2.8393E+00 -1.5569E+00 4.9378E-01 -6.9846E-02 S10 -1.4618E-01 3.5373E-01 -7.4163E-01 1.4511E+00 -2.1639E+00 2.2300E+00 -1.4636E+00 5.4520E-01 -8.6895E-02 S11 3.7609E-02 -8.9795E-01 1.7180E+00 -2.0667E+00 1.7261E+00 -1.0023E+00 3.8406E-01 -8.6764E-02 8.7008E-03 S12 -5.0501E-01 3.3081E-01 -1.0241E-01 -2.9135E-02 4.5806E-02 -2.1946E-02 5.6021E-03 -7.6183E-04 4.3492E-05

[0090] Table 4

[0091] Example 4

[0092] The following reference Figure 7 An optical imaging lens according to Example 4 of the present application is described.

[0093] like Figure 7 As shown, the optical imaging lens includes a lens barrel P0, a six-lens assembly, and a positioning ring assembly positioned within the barrel. The six-lens assembly includes, 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. A stop STO may be positioned between the second lens E2 and the third lens E3. The positioning ring assembly includes a first positioning ring P1, a second positioning ring P2, a third positioning ring P3, a fourth positioning ring P4, and a fifth positioning ring P5.

[0094] The structure of the lens of this embodiment is the same as that of the lens of Example 3. That is, the basic parameter table of the optical imaging lens of this embodiment is the same as Table 3, and the aspheric coefficient table is the same as Table 4. The difference between this embodiment and Example 3 is that the structural dimensions of some components in the lens barrel P0, the first positioning ring P1, the second positioning ring P2, the third positioning ring P3, the fourth positioning ring P4, and the fifth positioning ring P5 are different.

[0095] Figure 8A The axial chromatic aberration curves of the optical imaging lenses of Examples 3 and 4 are shown, which represent the deviation of the focal point of light of different wavelengths after passing through the optical imaging lenses. Figure 8B The astigmatism curves of the optical imaging lenses of Examples 3 and 4 are shown, which represent the meridional image curvature and sagittal image curvature corresponding to different field angles. Figure 8C The distortion curves of the optical imaging lenses of Examples 3 and 4 are shown, which represent the distortion values ​​corresponding to different field angles. Figure 8A to Figure 8C It can be seen that the optical imaging lenses provided in Examples 3 and 4 can achieve good imaging quality.

[0096] Example 5

[0097] The following reference Figure 9 The optical imaging lens according to Example 5 of the present application is described.

[0098] like Figure 9As shown, the optical image capturing lens includes a lens barrel P0, and a six-piece lens group and a positioning ring group disposed in the lens barrel P0. The six-piece lens group includes, 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. A stop STO can be disposed between the second lens E2 and the third lens E3. The positioning ring group includes a first positioning ring P1, a second positioning ring P2, a third positioning ring P3, a fourth positioning ring P4, and a fifth positioning ring P5. The positioning rings can block excess light rays during imaging from entering the next lens, while allowing the lens to better abut against the lens barrel P0, thereby enhancing the structural stability of the optical image capturing lens.

[0099] The first lens E1 has a negative refractive power, with a convex object side surface S1 and a concave image side surface S2. The second lens E2 has a positive refractive power, with a convex object side surface S3 and a concave image side surface S4. The third lens E3 has a positive refractive power, with a convex object side surface S5 and a convex image side surface S6. The fourth lens E4 has a negative refractive power, with a convex object side surface S7 and a concave image side surface S8. The fifth lens E5 has a positive refractive power, with a concave object side surface S9 and a convex image side surface S10. The sixth lens E6 has a negative refractive power, with a convex object side surface S11 and a concave image side surface S12. The filter has an object side surface S13 (not shown) and an image side surface S14 (not shown). Light from an object passes through the surfaces S1-S14 in order and is ultimately imaged on an imaging surface S15 (not shown).

[0100] Table 5 shows a basic parameter table of the optical image capturing lens of embodiment 5, where the units of the radius of curvature, thickness / distance, focal length are all millimeters (mm).

[0101]

[0102]

[0103] Table 5

[0104] In this embodiment, the total effective focal length f of the optical image capturing lens is 2.33 mm, and the half of the maximum field of view angle Semi-FOV of the optical image capturing lens is 54.5°.

[0105] In this embodiment, the object side surface and the image side surface of any one of the second lens E2 to the sixth lens E6 are aspherical surfaces. Table 6 shows the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 of the aspherical surfaces S3-S12 that can be used in embodiment 5.

[0106] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S3 -2.9001E-02 -5.8310E-02 -2.2115E+00 2.3886E+01 -1.3150E+02 4.2986E+02 -8.3161E+02 8.7856E+02 -3.9038E+02 S4 -1.2386E-01 -1.0927E+00 2.4272E+01 -2.9256E+02 2.1871E+03 -1.0200E+04 2.8886E+04 -4.5396E+04 3.0342E+04 S5 -8.9763E-02 1.6228E-01 -2.0529E+00 1.4785E+01 -6.1664E+01 1.5544E+02 -2.2663E+02 1.6959E+02 -4.6242E+01 S6 1.9795E-01 -1.9118E+00 1.1099E+01 -4.2606E+01 1.0788E+02 -1.7787E+02 1.8363E+02 -1.0774E+02 2.7435E+01 S7 -2.1434E-02 -1.8116E+00 1.0925E+01 -3.8021E+01 8.5907E+01 -1.2608E+02 1.1576E+02 -6.0451E+01 1.3712E+01 S8 -2.4289E-01 1.5981E-02 1.1376E+00 -3.8411E+00 7.3272E+00 -8.7981E+00 6.5412E+00 -2.7657E+00 5.1051E-01 S9 1.2532E-01 -2.3145E-01 3.4248E-01 -3.5473E-01 2.4083E-01 -9.9692E-02 2.5905E-02 -4.9281E-03 5.9487E-04 S10 2.6374E-01 -6.9251E-01 1.7638E+00 -2.9058E+00 3.1219E+00 -2.1534E+00 9.1659E-01 -2.1776E-01 2.1980E-02 S11 -3.6031E-02 -8.1353E-01 2.1393E+00 -3.1779E+00 2.9992E+00 -1.8137E+00 6.7819E-01 -1.4236E-01 1.2785E-02 S12 -4.5305E-01 4.9005E-01 -3.7651E-01 1.9772E-01 -6.8331E-02 1.4631E-02 -1.7309E-03 8.1546E-05 7.7388E-07

[0107] Table 6

[0108] Example 6

[0109] The following refers to Figure 10 An optical image capturing lens according to Embodiment 6 of the present application is described.

[0110] As Figure 10 shown, the optical image capturing lens includes a lens barrel P0, and a six-piece lens group and a positioning ring group disposed in the lens barrel P0. The six-piece lens group includes, 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. A stop STO can be disposed between the second lens E2 and the third lens E3. The positioning ring group includes a first positioning ring P1, a second positioning ring P2, a third positioning ring P3, a fourth positioning ring P4, and a fifth positioning ring P5.

[0111] The structure of the lens of the present embodiment is the same as that of the lens of Embodiment 5, i.e., the basic parameter table of the optical image capturing lens of the present embodiment is the same as Table 5, and the aspherical surface coefficient table is the same as Table 6. The difference between the present embodiment and Embodiment 5 lies in the structure size of some elements in the lens barrel P0, the first positioning ring P1, the second positioning ring P2, the third positioning ring P3, the fourth positioning ring P4, and the fifth positioning ring P5.

[0112] Figure 11A Curves of axial chromatic aberration of the optical image capturing lenses of Embodiments 5 and 6 are shown, which represent the convergence focus deviation of light rays of different wavelengths after passing through the optical image capturing lenses. Figure 11B Curves of astigmatism of the optical image capturing lenses of Embodiments 5 and 6 are shown, which represent the meridional image surface curvature and sagittal image surface curvature corresponding to different field angles. Figure 11C Curves of distortion of the optical image capturing lenses of Embodiments 5 and 6 are shown, which represent the distortion size values corresponding to different field angles. According to Figure 11A to Figure 11C It can be known that the optical image capturing lenses given in Embodiments 5 and 6 can achieve good imaging quality.

[0113] Table 7 shows the values of parameters d1s, d2m, D2m, d3s, d3m, D3s, D3m, d4s, d5s, D5s, d0s, EP12, CP2, EP23, EP34, CP5, and SAG41 of each of Embodiments 1-6. Wherein, the above parameters can be measured according to the labeling method shown in Figure 1 Table 7, and the units of the parameters listed in Table 7 are mm.

[0114] Parameter / Example 1 2 3 4 5 6 d1s 1.4917 1.4465 1.5324 1.4829 1.5107 1.4769 d2m 1.6000 1.3029 1.6025 1.6025 2.0808 1.8668 D2m 3.2173 3.4165 3.2883 3.4076 3.3226 3.7009 d3s 1.6832 1.8817 2.2324 2.1106 2.0060 2.3996 d3m 1.6832 1.8817 1.9662 1.9662 2.2680 2.4732 D3s 3.6692 3.8041 3.2575 3.5107 3.4842 3.5695 D3m 3.6692 3.8041 3.4821 3.5025 3.6001 3.7522 d4s 2.2879 2.2879 2.2436 2.1781 2.4311 3.0772 d5s 2.7429 2.7429 2.6111 2.6111 2.8637 2.8864 D5s 4.0119 4.1846 3.3756 3.7274 5.1619 5.3586 d0s 3.0666 3.1617 2.6765 2.914 2.8315 2.9229 EP12 0.5710 0.4557 0.2541 0.2374 0.3884 0.3451 CP2 0.2939 0.3556 0.2056 0.1984 0.2400 0.2695 EP23 0.4304 0.4986 0.4868 0.4654 0.4908 0.4870 EP34 0.5205 0.4624 0.6352 0.6244 0.4404 0.4210 CP5 0.2783 0.2667 0.7381 0.7135 0.0180 0.0180 SAG41 0.2312 0.2312 0.0105 0.0105 -0.0440 -0.0440

[0115] Table 7

[0116] Table 8 shows the values of conditional expressions of each of Embodiments 1-6.

[0117] Conditional expression / Example 1 2 3 4 5 6 f4 / R7 0.71 0.71 -0.87 -0.87 -0.21 -0.21 π x (D3s^2 - d3s^2) / f3^2 0.87 0.90 4.49 6.28 11.71 10.08 tan (Semi-FOV) x d0s / d1s 2.63 2.80 2.27 2.56 2.63 2.77 N4 / N3 x (D3m / d3m) 2.27 2.11 1.70 1.71 1.49 1.42 D2m / d2m x |f3| / f 5.50 7.18 1.74 1.80 1.01 1.26 d4s / R8 x f3 / f4 5.10 5.10 -0.98 -0.95 -0.64 -0.81 (D5s - d5s) / CP5 4.56 5.41 1.04 1.56 127.68 137.34 EP12 / CT2 x N2 1.23 0.98 1.53 1.43 1.69 1.50 CP2 / EP23 x T23 / CT3 0.26 0.27 0.09 0.09 0.10 0.11 EP34 / SAG41 2.25 2.00 60.49 59.47 -10.02 -9.57 (N1 + N3 + N5) / (N2 + N4 + N6) 1.06 1.06 1.04 1.04 0.99 0.99

[0118] Table 8

[0119] The present application also provides an imaging device, the electronic photosensitive element of which can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor device (CMOS). The imaging device can be a stand-alone imaging apparatus 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 optical imaging lens described above.

[0120] The above description is merely preferred embodiments of the present application and a description of the principles of the technology used. It should be understood by those skilled in the art that the scope of the utility model involved in the present application is not limited to the technical solutions formed by the specific combinations of the technical features described above, and should also cover other technical solutions formed by any combination of the technical features described above or equivalent features without departing from the inventive concept. For example, the technical solutions formed by the mutual replacement of the above-described features and the technical features disclosed in the present application (but not limited to) having similar functions.

Claims

1. An optical image capturing lens characterized in that, Comprising: a six-piece lens group including, 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; a sign of a power of the third lens and a sign of a power of the fourth lens are opposite in positive and negative properties; object side surfaces of the third lens and the fourth lens are convex; a positioning ring group including a third positioning ring disposed on and in contact with an image side surface of the third lens; and a lens barrel in which the six-piece lens group and the positioning ring group are disposed; wherein a radius of curvature R7 of an object side surface of the fourth lens and an effective focal length f4 of the fourth lens satisfy -0.9 < f4 / R7 < 0.75 and f4 / R7 ≠ 0; an effective focal length f3 of the third lens, an inner diameter d3s of an object side surface of the third positioning ring, and an outer diameter D3s of the object side surface of the third positioning ring satisfy 0.85 < π × (D3s2-d3s2) / f3 2 < 11.

75.

2. The optical image pickup lens according to claim 1, characterized by a refractive index N3 of the third lens, a refractive index N4 of the fourth lens, an inner diameter d3m of an image side surface of the third positioning ring, and an outer diameter D3m of the image side surface of the third positioning ring satisfy 1.4 < N4 / N3 × (D3m / d3m) < 2.

3.

3. The optical image pickup lens according to claim 1, characterized by the positioning ring group further includes a first positioning ring disposed on and in contact with an image side surface of the first lens, wherein a half of a maximum field angle Semi-FOV of the optical image taking lens, an inner diameter d0s of an object side end surface of the lens barrel, and an inner diameter d1s of an object side surface of the first positioning ring satisfy 2.25 < tan(Semi-FOV) × d0s / d1s < 2.

85.

4. The optical image pickup lens according to claim 1, characterized by the positioning ring group further includes a second positioning ring disposed on and in contact with an image side surface of the second lens, wherein a total effective focal length f of the optical image taking lens, an effective focal length f3 of the third lens, an inner diameter d2m of an image side surface of the second positioning ring, and an outer diameter D2m of the image side surface of the second positioning ring satisfy 1 < D2m / d2m × |f3| / f < 7.

2.

5. The optical image pickup lens according to claim 1, characterized by the positioning ring group further includes a first positioning ring disposed on and in contact with an image side surface of the first lens and a second positioning ring disposed on and in contact with an image side surface of the second lens, wherein a center thickness CT2 of the second lens along the optical axis, a refractive index N2 of the second lens, and a distance EP12 of the first positioning ring and the second positioning ring along the optical axis satisfy 0.95 < EP12 / CT2 × N2 < 1.

7.

6. The optical image pickup lens according to claim 1, characterized by the positioning ring group further includes a second positioning ring disposed on and in contact with an image side surface of the second lens, The air interval T23 of the second lens and the third lens on the optical axis, the central thickness CT3 of the third lens on the optical axis, the maximum thickness CP2 of the second positioning ring along the optical axis, and the distance EP23 of the second positioning ring and the third positioning ring along the optical axis satisfy: 0.05 < CP2 / EP23 x T23 / CT3 < 0.

3.

7. The optical image pickup lens according to any one of claims 1 to 6, characterized by The positioning ring set further comprises a fourth positioning ring arranged on the image side of the fourth lens and in contact with the image side of the fourth lens, The effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, the curvature radius R8 of the image side of the fourth lens, and the inner diameter d4s of the object side of the fourth positioning ring satisfy: -1 < d4s / R8 x f3 / f4 < 5.15, and d4s / R8 x f3 / f4 ≠ 0.

8. The optical image pickup lens according to any one of claims 1 to 6, characterized by The positioning ring set further comprises a fourth positioning ring arranged on the image side of the fourth lens and in contact with the image side of the fourth lens, The distance EP34 of the third positioning ring and the fourth positioning ring along the optical axis and the on-axis distance SAG41 between the intersection of the object side of the fourth lens and the optical axis and the maximum effective radius vertex point of the object side of the fourth lens satisfy: -10.05 < EP34 / SAG41 < 60.5, and EP34 / SAG41 ≠ 0.

9. The optical image pickup lens according to any one of claims 1 to 6, characterized by The positioning ring set further comprises a fifth positioning ring arranged on the image side of the fifth lens and in contact with the image side of the fifth lens, and the reflectivity of the fifth positioning ring to light in the visible light range is less than or equal to 3%, The maximum thickness CP5 of the fifth positioning ring along the optical axis, the inner diameter d5s of the object side of the fifth positioning ring, and the outer diameter D5s of the object side of the fifth positioning ring satisfy: 1 < (D5s-d5s) / CP5 < 137.

35.

10. The optical image pickup lens according to any one of claims 1 to 6, characterized by The refractive index N1 of the first lens, the refractive index N2 of the second lens, the refractive index N3 of the third lens, the refractive index N4 of the fourth lens, the refractive index N5 of the fifth lens, and the refractive index N6 of the sixth lens satisfy: 0.95 < (N1+N3+N5) / (N2+N4+N6) < 1.1.

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