Optical imaging lens

Abstract

The invention relates to an optical imaging lens, which comprises a lens barrel, and an imaging lens group and a plurality of spacing elements accommodated in the lens barrel, and is characterized in that the imaging lens group sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens with focal power from an object side to an image side along an optical axis, an air gap is formed between the adjacent lenses; the plurality of spacing elements comprise a first spacing element which is positioned between the first lens and the second lens and at least partially abuts against the image side surface of the first lens; the second spacing element is located between the second lens and the third lens and at least partially abuts against the image side face of the second lens; the optical imaging lens satisfies the following conditions: 10.30 < = L / (CT2 + T12) < = 11.69, 11.34 < = f12 / EP12 < = 14.77; 0.83 < = (D1m-d1m) / R3 < = 1.56, and 2.68 < = R4 / d2s < = 3.50. According to the optical imaging lens, stray light can be effectively shielded by using the spacing elements on the premise of ensuring the compact internal structure, and the imaging quality is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of imaging lens, in particular to an optical imaging lens. BACKGROUND

[0002] In today's digital age, mobile terminal devices have become an important tool for people to record life and obtain information. Users' requirements for device shooting functions are constantly rising, and they expect to obtain clear, delicate and artistic images in various complex environments. With the development of smartphone photography technology, the internal space of smartphones is gradually developing in the direction of compactness, leaving limited space for lens modules. If the lens volume is too large, it will squeeze the space of other important components; the air gap between the lenses of the optical imaging lens is small, especially in the relatively sensitive air gap, light will interfere during transmission, which is easy to produce stray light, causing edge field dispersion and affecting the quality of imaging. SUMMARY

[0003] To solve the above problems existing in the prior art, the purpose of the present application is to provide an optical imaging lens which can effectively block stray light and improve imaging quality under the premise of ensuring compact internal structure.

[0004] To achieve the above-mentioned purpose of the application, the present application provides an optical imaging lens, comprising a lens barrel, an imaging lens group and a plurality of spacer elements contained in the lens barrel;

[0005] The imaging lens group comprises, in order from the object side to the image side along the optical axis: a first lens with optical power, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, with an air gap between adjacent lenses;

[0006] The plurality of spacer elements comprises a first spacer element located between the first lens and the second lens and at least partially abutting the image side surface of the first lens; and a second spacer element located between the second lens and the third lens and at least partially abutting the image side surface of the second lens.

[0007] The optical imaging lens satisfies: 10.30≤L / (CT2+T12)≤11.69, 11.34≤f12 / EP12≤14.77;

[0008] 0.83≤(D1m-d1m) / R3≤1.56, 2.68≤R4 / d2s≤3.50;

[0009] Wherein, L is the maximum height of the lens barrel, CT2 is the thickness of the second lens on the optical axis, T12 is the air interval of the first lens and the second lens on the optical axis, f12 is the combined focal length of the first lens and the second lens, EP12 is the distance from the image side surface of the first spacer element to the object side surface of the second spacer element along the optical axis direction, R3 is the curvature radius of the object side surface of the second lens, D1m is the outer diameter of the image side surface of the first spacer element, d1m is the inner diameter of the image side surface of the first spacer element, R4 is the curvature radius of the image side surface of the second lens, and d2s is the inner diameter of the object side surface of the second spacer element.

[0010] According to one of the technical solutions of the present application, the plurality of spacer elements further comprises a third spacer element located between the third lens and the fourth lens and at least partially abutting against the image side surface of the third lens.

[0011] The optical imaging lens satisfies: 1.60≤R7 / D3m≤2.27.

[0012] Wherein, R7 is the curvature radius of the object side surface of the fourth lens, and D3m is the outer diameter of the image side surface of the third spacer element.

[0013] According to one of the technical solutions of the present application, the plurality of spacer elements further comprises a fourth spacer element located between the fourth lens and the fifth lens and at least partially abutting against the image side surface of the fourth lens.

[0014] The optical imaging lens satisfies: 6.25≤f4 / (CP3+EP34)≤10.60.

[0015] Wherein, f4 is the effective focal length of the fourth lens, CP3 is the thickness of the third spacer element along the optical axis direction, and EP34 is the distance from the image side surface of the third spacer element to the object side surface of the fourth spacer element along the optical axis direction.

[0016] According to one of the technical solutions of the present application, the optical imaging lens satisfies: 1.50≤R9 / d4m≤3.29.

[0017] Wherein, R9 is the curvature radius of the object side surface of the fifth lens, and d4m is the inner diameter of the image side surface of the fourth spacer element.

[0018] According to one of the technical solutions of the present application, the plurality of spacer elements further comprises a fifth spacer element located between the fifth lens and the sixth lens and at least partially abutting against the image side surface of the fifth lens.

[0019] The optical imaging lens satisfies: 0.30≤(D5s-D4m) / EP45≤1.63.

[0020] wherein D5s is an outer diameter of the object side surface of the fifth spacer element, D4m is an outer diameter of the image side surface of the fourth spacer element, and EP45 is a distance from the image side surface of the fourth spacer element to the object side surface of the fifth spacer element along the optical axis direction.

[0021] According to one of the technical solutions of the present application, the optical imaging lens satisfies: 4.59≤d5s / (CT5+T56)≤5.5.

[0022] wherein d5s is an inner diameter of the object side surface of the fifth spacer element, CT5 is a thickness of the fifth lens along the optical axis, and T56 is an air gap between the fifth lens and the sixth lens along the optical axis.

[0023] According to one of the technical solutions of the present application, the plurality of spacer elements further comprises a sixth spacer element located between the sixth lens and the seventh lens and at least partially abutting against the image side surface of the sixth lens; and a seventh spacer element located between the seventh lens and the eighth lens and at least partially abutting against the image side surface of the seventh lens.

[0024] The optical imaging lens satisfies: 1.59≤EP67 / EP56≤2.85.

[0025] wherein EP56 is a distance from the image side surface of the fifth spacer element to the object side surface of the sixth spacer element along the optical axis direction, and EP67 is a distance from the image side surface of the sixth spacer element to the object side surface of the seventh spacer element along the optical axis direction.

[0026] According to one of the technical solutions of the present application, the optical imaging lens satisfies: 3.34≤f7 / EP67≤4.02.

[0027] wherein f7 is an effective focal length of the seventh lens, and EP67 is a distance from the image side surface of the sixth spacer element to the object side surface of the seventh spacer element along the optical axis direction.

[0028] According to one of the technical solutions of the present application, the optical imaging lens satisfies: -2.41≤f6 / d6s≤-1.78.

[0029] wherein f6 is an effective focal length of the sixth lens, and d6s is an inner diameter of the object side surface of the sixth spacer element.

[0030] According to one of the technical solutions of the present application, the optical imaging lens satisfies: 5.11≤d7s / CT7≤7.52.

[0031] wherein d7s is an inner diameter of the object side surface of the seventh spacer element, and CT7 is a thickness of the seventh lens along the optical axis.

[0032] According to one of the technical solutions of the present application, the plurality of spacer elements further comprises an eighth spacer element located between the eighth lens and the image plane and at least partially abutting against the image side surface of the eighth lens;

[0033] The optical imaging lens satisfies: 0.88≤(CT8+T78) / EP78≤1.56;

[0034] Wherein, CT8 is the thickness of the eighth lens on the optical axis, T78 is the air gap of the seventh lens and the eighth lens on the optical axis, EP78 is the distance from the image side surface of the seventh spacer element to the object side surface of the eighth spacer element along the optical axis direction.

[0035] According to one of the technical solutions of the present application, the optical imaging lens satisfies: -3.85≤f3 / (D2m-d2m)≤-1.66;

[0036] Wherein, f3 is the effective focal length of the third lens, D2m is the outer diameter of the image side surface of the second spacer element, and d2m is the inner diameter of the image side surface of the second spacer element.

[0037] According to one of the technical solutions of the present application, the optical imaging lens satisfies: 5.08≤d0s / EP01≤6.49;

[0038] Wherein, d0s is the inner diameter of the object side end surface of the lens barrel, and EP01 is the interval distance from the object side end surface of the lens barrel to the object side surface of the first spacer along the direction of the optical axis.

[0039] According to one of the technical solutions of the present application, the optical imaging lens satisfies: 7.39≤d1m / EP12≤9.30;

[0040] Wherein, d1m is the inner diameter of the image side surface of the first spacer element, and EP12 is the distance from the image side surface of the first spacer element to the object side surface of the second spacer along the optical axis direction.

[0041] The optical imaging lens of the present application uses eight lenses with optical power and at least one spacer element, the first lens to the eighth lens are arranged and spaced in sequence; the maximum height L of the lens barrel, the thickness CT2 of the second lens on the optical axis, the air gap T12 between the first lens and the second lens on the optical axis satisfy 10.30≤L / (CT2+T12)≤11.69; the combined focal length f12 of the first lens and the second lens, the distance EP12 between the image side of the first spacer element and the object side of the second spacer element along the optical axis direction satisfy 11.34≤f12 / EP12≤14.77, which can effectively optimize the overall height layout and light refraction convergence efficiency of the lens, and realize the compact design of the optical imaging lens. In this design, the thickness and air gap of the second lens structure area are sensitive, the combined optical power of the first two lenses will interfere with its adjacent spacer element during transmission into the second lens, the lens edge light is relatively chaotic, which will make the defocus curve present large discreteness, affecting the imaging quality of the lens. The present application can ensure that the stray light is effectively blocked by the first spacer element when the light passes through the second lens by reasonably controlling the ratio of (D1m-d1m) / R3 and R4 / d2s, and at the same time, by constraining the size matching relationship between the curvature radius of the image side of the second lens and the inner diameter of the second spacer element, the two cooperatively form an aperture constraint, which helps the light to propagate to the subsequent optical elements at a uniform and reasonable angle, reduces the scattering and interference of the light, and further improves the overall image quality of the optical imaging lens. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings described in the following are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort based on these drawings.

[0043] Figure 1 The structural arrangement diagram of an optical imaging lens according to the present application and the schematic diagram of part of the parameters are shown;

[0044] Figure 2A 、 Figure 2B 、 Figure 2C The structural schematic diagrams of three optical imaging lenses according to Embodiment One of the present application are shown;

[0045] Figure 2D 、 Figure 2E 、 Figure 2F and Figure 2G The on-axis chromatic aberration curve, the astigmatism curve, the distortion curve and the magnification chromatic aberration curve of the optical imaging lens according to Embodiment One of the present application are shown respectively;

[0046] Figure 3A 、 Figure 3B 、 Figure 3C FIG. 1 shows structural schematic diagrams of three optical imaging lenses according to Embodiment Two of the present application;

[0047] Figure 3D 、 Figure 3E 、 Figure 3F and Figure 3G FIG. 4 shows axial chromatic aberration curves, astigmatism curves, distortion curves and relative refractive power curves of the optical imaging lenses according to Embodiment Two of the present application, respectively;

[0048] Figure 4A 、 Figure 4B 、 Figure 4C FIG. 5 shows structural schematic diagrams of three optical imaging lenses according to Embodiment Three of the present application;

[0049] Figure 4D 、 Figure 4E 、 Figure 4F and Figure 4G FIG. 8 shows axial chromatic aberration curves, astigmatism curves, distortion curves and relative refractive power curves of the optical imaging lenses according to Embodiment Three of the present application, respectively;

[0050] Figure 5 FIG. 6 shows MTF defocus curves of the optical imaging lens of Example 1 when L / (CT2+T12)=11.25, f12 / EP12=13.50, (D1m-d1m) / R3=0.60, R4 / d2s=2.50;

[0051] Figure 6 FIG. 7 shows MTF defocus curves of the optical imaging lens of the present application scheme 1 when L / (CT2+T12)=11.25, f12 / EP12=13.50, (D1m-d1m) / R3=1.10, R4 / d2s=2.10;

[0052] Figure 7 FIG. 8 shows MTF defocus curves of the optical imaging lens of the present application scheme 2 when L / (CT2+T12)=11.25, f12 / EP12=13.50, (D1m-d1m) / R3=1.50, R4 / d2s=30;

[0053] Figure 8 FIG. 9 shows MTF defocus curves of the optical imaging lens of Example 2 when L / (CT2+T12)=11.25, f12 / EP12=13.50, (D1m-d1m) / R3=1.60, R4 / d2s=3.70.

[0054] Wherein, the above drawings include the following reference signs:

[0055] E1, first lens; P1, first spacer element; E2, second lens; P2, second spacer element; E3, third lens; P3, third spacer element; E4, fourth lens; P4, fourth spacer element; P4b, fourth auxiliary spacer element; E5, fifth lens; P5, fifth spacer element; E6, sixth lens; P6, sixth spacer element; E7, seventh lens; P7, seventh spacer element; E8, eighth lens; P8, eighth spacer element; S1, object side surface of the first lens; S2, image side surface of the first lens; S3, object side surface of the second lens; S4, image side surface of the second lens; S5, object side surface of the third lens; S6, image side surface of the third lens; S7, object side surface of the fourth lens; S8, image side surface of the fourth lens; S9, object side surface of the fifth lens; S10, image side surface of the fifth lens; S11, object side surface of the sixth lens; S12, image side surface of the sixth lens; S13, object side surface of the seventh lens; S14, image side surface of the seventh lens; S15, object side surface of the eighth lens; S16, image side surface of the eighth lens. DETAILED DESCRIPTION

[0056] 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 noted that these detailed descriptions are merely exemplary of the application and are not intended to limit the scope of the application in any way. 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.

[0057] It is noted that, in this specification, the expressions first, second, third, etc. are merely used to distinguish one feature from another feature, and do not indicate any limitation on the features. Thus, the first lens discussed below can also be referred to as a second lens or a third lens, or the first lens can also be referred to as a first optic, without departing from the teachings of the present application.

[0058] 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 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.

[0059] 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 convexity or concavity in the paraxial region can be determined depending on 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 image 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.

[0060] It should also be understood that the words "comprise," "comprising," "include," "including," and / or "has," "having," when used in the present 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 terms such as "at least one of" a list of items appear, the term is intended to cover the items individually as well as in the aggregate. Further, when describing the embodiments of the present application, the use of "can" means "one or more embodiments of the present application." Also, the use of the term "example" is intended to mean an example or illustration.

[0061] 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.

[0062] 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 a more specific and detailed manner, but should not be understood as limitations to 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.

[0063] As Figure 1As shown, the imaging lens set of the exemplary embodiment of the present application includes eight lenses with optical power, including, in order from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, wherein each lens is independent of each other, and each lens has an air gap on the optical axis.

[0064] The plurality of spacer elements includes a first spacer element located between the first lens and the second lens and at least partially in contact with the image side surface of the first lens, a second spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens, a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens, a fourth spacer element located between the fourth lens and the fifth lens and at least partially in contact with the image side surface of the fourth lens, a fifth spacer element located between the fifth lens and the sixth lens and at least partially in contact with the image side surface of the fifth lens, a sixth spacer element located between the sixth lens and the seventh lens and at least partially in contact with the image side surface of the sixth lens, a seventh spacer element located between the seventh lens and the eighth lens and at least partially in contact with the image side surface of the seventh lens, and an eighth spacer element located between the eighth lens and the image surface and at least partially in contact with the image side surface of the eighth lens.

[0065] The imaging lens set and the plurality of spacer elements are accommodated in a lens barrel, the lens barrel including an object side end surface, an image side end surface, an outer annular surface, and an inner annular surface, the inner annular surface of the lens barrel being stepped along the optical axis of the optical imaging lens.

[0066] In some embodiments of the present application, the optical imaging lens can further include a color filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0067] The present application provides an optical imaging lens, including an imaging lens set and a plurality of spacer elements; the imaging lens set includes, in order from the object side to the image side along the optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens; the plurality of spacer elements includes a first spacer element located between the first lens and the second lens and at least partially in contact with the image side surface of the first lens; a second spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens;

[0068] The optical imaging lens satisfies:

[0069] 10.30≤L / (CT2+T12)≤11.69, 11.34≤f12 / EP12≤14.77;

[0070] 0.83≤(D1m-d1m) / R3≤1.56, 2.68≤R4 / d2s≤3.50;

[0071] wherein, L is the maximum height of the lens barrel, CT2 is the thickness of the second lens along the optical axis, T12 is the air gap between the first lens and the second lens along the optical axis, f12 is the combined focal length of the first lens and the second lens, EP12 is the distance from the image side surface of the first spacer element to the object side surface of the second spacer element along the optical axis, R3 is the radius of curvature of the object side surface of the second lens, D1m is the outer diameter of the image side surface of the first spacer element, d1m is the inner diameter of the image side surface of the first spacer element, 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 spacer element.

[0072] The optical imaging lens can effectively optimize the overall height layout and light refraction convergence efficiency of the lens when 10.30≤L / (CT2+T12)≤11.69 and 11.34≤f12 / EP12≤14.77 are met, so as to realize compact design of the optical imaging lens. In this design, the thickness and air gap of the second lens structure region are relatively sensitive, the combined optical power of the first two lenses will interfere with the adjacent spacer elements during transmission into the second lens, the lens edge light is relatively chaotic, which will make the defocus curve present large discreteness, and affect the imaging quality of the lens. By reasonably controlling the proportional relationship of (D1m-d1m) / R3 and R4 / d2s, it can be ensured that the first spacer element effectively blocks stray light when the light passes through the second lens, and by constraining the size matching relationship between the radius of curvature of the image side surface of the second lens and the inner diameter of the second spacer element, the two cooperatively form an aperture constraint, which is helpful to make the light propagate to the subsequent optical elements at a uniform and reasonable angle, reduce the scattering and interference of the light, and further improve the overall image quality of the optical imaging lens.

[0073] from Figures 5 to 8It can be known that when the optical imaging lens satisfies L / (CT2+T12)=11.25, f12 / EP12=13.50, (D1m-d1m) / R3=0.60, R4 / d2s=2.50, the defocus curve of the optical imaging lens is dispersed, the field curvature of the outer field is biased to be negative, the local blur is partial, and the imaging distortion is generated. When the optical imaging lens satisfies L / (CT2+T12)=11.25, f12 / EP12=13.50, (D1m-d1m) / R3=1.10, R4 / d2s=2.10 or L / (CT2+T12)=11.25, f12 / EP12=13.50, (D1m-d1m) / R3=1.50, R4 / d2s=3.00, the optical path of the optical imaging lens is stable, the defocus curve of the lens is normal, and the imaging quality is better. When the optical imaging lens satisfies L / (CT2+T12)=11.25, f12 / EP12=13.50, (D1m-d1m) / R3=1.60, R4 / d2s=3.70, the defocus curve of the optical imaging lens is dispersed, the field curvature of the outer field is biased to be positive, the imaging is blurred, and the imaging quality is poor.

[0074] Therefore, when 10.30≤L / (CT2+T12)≤11.69, 11.34≤f12 / EP12≤14.77 are satisfied and 0.83≤(D1m-d1m) / R3≤1.56, 2.68≤R4 / d2s≤3.50 are controlled, the overall height layout of the lens and the light refraction convergence efficiency can be optimized, the stray light can be effectively shielded, the light can be propagated to the subsequent optical element at a uniform and reasonable angle, the scattering and interference of the light are reduced, and then the overall image quality of the optical imaging lens is improved.

[0075] Example 1 Scheme 1 of the present application Scheme 2 of the present application Example 2 L / (CT2+T12) 11.25 11.25 11.25 11.25 f12 / EP12 13.50 13.50 13.50 13.50 (D1m-d1m) / R3 0.60 1.10 1.50 1.60 R4 / d2s 2.50 2.10 30 3.70

[0076] Table 1

[0077] In some embodiments of the present application, the plurality of spacing elements further comprises a third spacing element located between the third lens and the fourth lens and at least partially abutting the image side surface of the third lens; the radius of curvature R7 of the object side surface of the fourth lens and the outer diameter D3m of the image side surface of the third spacing element satisfy: 1.60≤R7 / D3m≤2.27; which is beneficial to improve the reflection problem between the fourth lens and the outer barrel of the third lens, thereby reducing stray light and improving the imaging quality of the lens.

[0078] In some embodiments of the present application, the plurality of spacer elements further comprises a fourth spacer element located between the fourth lens and the fifth lens and at least partially abutting the image side surface of the fourth lens; the effective focal length f4 of the fourth lens, the thickness CP3 of the third spacer element along the optical axis direction, and the distance EP34 from the image side surface of the third spacer element to the object side surface of the fourth spacer element along the optical axis direction satisfy: 6.25≤f4 / (CP3+EP34)≤10.60; which positively affects the magnification and chromatic aberration correction in the middle part of the imaging system, so that the middle part of the imaging system has a larger magnification and takes into account the chromatic aberration correction, thereby ensuring high magnification and image clarity of the lens imaging.

[0079] In some embodiments of the present application, the radius of curvature R9 of the object side surface of the fifth lens and the inner diameter d4m of the image side surface of the fourth spacer element satisfy: 1.50≤R9 / d4m≤3.29; which can ensure sufficient light entering the fifth lens and reduce ghost images caused by reflection between the fourth lens and the fifth lens, thereby improving the imaging quality.

[0080] In some embodiments of the present application, the plurality of spacer elements further comprises a fifth spacer element located between the fifth lens and the sixth lens and at least partially abutting the image side surface of the fifth lens; the outer diameter D5s of the object side surface of the fifth spacer element, the outer diameter D4m of the image side surface of the fourth spacer element, and the distance EP45 from the image side surface of the fourth spacer element to the object side surface of the fifth spacer element along the optical axis direction satisfy: 0.30≤(D5s-D4m) / EP45≤1.63; by controlling the outer diameter difference between the object side surface of the fifth spacer element and the image side surface of the fourth spacer element, stray light rays can be effectively intercepted. At the same time, the distance from the fourth spacer element to the fifth spacer element parallel to the optical axis is controlled to ensure sufficient space, which helps the stability of the lens assembly.

[0081] In some embodiments of the present application, the inner diameter d5s of the object side surface of the fifth spacer element, the thickness CT5 of the fifth lens along the optical axis, and the air gap T56 between the fifth lens and the sixth lens satisfy: 4.59≤d5s / (CT5+T56)≤5.5; which ensures that the fifth lens has sufficient mechanical strength, while avoiding excessive air gap between the fifth lens and the sixth lens causing stray light, thereby ensuring the stability of the optical performance of the lens.

[0082] In some embodiments of the present application, the plurality of spacer elements further comprises a sixth spacer element located between the sixth lens and the seventh lens and at least partially abutting the image-side surface of the sixth lens; a seventh spacer element located between the seventh lens and the eighth lens and at least partially abutting the image-side surface of the seventh lens; and a distance EP56 between the image-side surface of the fifth spacer element and the object-side surface of the sixth spacer element along the optical axis direction and a distance EP67 between the image-side surface of the sixth spacer element and the object-side surface of the seventh spacer element along the optical axis direction satisfy: 1.59≤EP67 / EP56≤2.85; by controlling the ratio of EP67 to EP56, the thickness distribution of the flange mechanism of the sixth lens and the seventh lens is controlled, while the molding of the sixth lens and the seventh lens is ensured.

[0083] In some embodiments of the present application, the effective focal length f7 of the seventh lens and the distance EP67 between the image-side surface of the sixth spacer element and the object-side surface of the seventh spacer element along the optical axis direction satisfy: 3.34≤f7 / EP67≤4.02; which can effectively focus the light when passing through the seventh lens, reduce the spherical aberration and astigmatism caused by uneven refraction during light propagation; while maintaining the compactness of the optical imaging lens, the focusing effect of the light beam is optimized, the imaging quality is improved, and the dispersion of the defocus curve is reduced.

[0084] In some embodiments of the present application, the effective focal length f6 of the sixth lens and the inner diameter d6s of the object-side surface of the sixth spacer element satisfy: -2.41≤f6 / d6s≤-1.78; which can reduce the optical path difference of the upper and lower light in the outer field of view, effectively control the astigmatism amount of the optical imaging lens, improve the astigmatism and distortion problems, and thus improve the imaging quality of the lens.

[0085] In some embodiments of the present application, the inner diameter d7s of the object-side surface of the seventh spacer element and the thickness CT7 of the seventh lens on the optical axis satisfy: 5.11≤d7s / CT7≤7.52; which can reduce the radial pressure of the seventh lens, improve the stability of the seventh lens, and improve the lens deformation problem caused by assembly, thereby ensuring the reliability of the optical structure of the lens.

[0086] In some embodiments of the present application, the plurality of spacer elements further comprises an eighth spacer element located between the image side surface of the eighth lens and the image plane and at least partially abutting against the image side surface of the eighth lens; the thickness CT8 of the eighth lens on the optical axis, the air gap T78 of the seventh lens and the eighth lens on the optical axis, and the distance EP78 of the image side surface of the seventh spacer element to the object side surface of the eighth spacer element along the optical axis direction satisfy: 0.88≤(CT8+T78) / EP78≤1.56; the propagation path of the light rays in the seventh lens, the eighth lens and the spacer region therebetween can be optimized, so that the light rays can be more accurately focused on the imaging plane, thereby improving the clarity and resolution of the imaging; at the same time, it can also ensure that the seventh lens and the eighth lens are evenly distributed under pressure, so that the assembly process is stable.

[0087] In some embodiments of the present application, the effective focal length f3 of the third lens and the outer diameter D2m of the image side surface of the second spacer element and the inner diameter d2m of the image side surface of the second spacer element satisfy: -3.85≤f3 / (D2m-d2m)≤-1.66; by controlling the difference between the inner and outer diameters of the object side surface of the second spacer element, it helps to intercept excess stray light, while limiting the effective focal length of the third lens, which is conducive to ensuring the stable transmission of light rays.

[0088] In some embodiments of the present application, the inner diameter d0s of the object side end surface of the lens barrel and the spacing distance EP01 of the object side end surface of the lens barrel to the object side surface of the first spacer along the direction of the optical axis satisfy: 5.08≤d0s / EP01≤6.49; by controlling this condition, the inner diameter of the object side end surface of the lens barrel can be constrained, which is conducive to reasonably controlling the incident aperture size of the light rays, while effectively controlling the light throughput of the optical imaging lens, which helps to balance the incident angle and diameter of the light rays.

[0089] In some embodiments of the present application, the inner diameter d1m of the image side surface of the first spacer element and the distance EP12 of the image side surface of the first spacer element to the object side surface of the second spacer along the direction of the optical axis satisfy: 7.39≤d1m / EP12≤9.30; which is conducive to reducing the incident angle of the light rays between the first and second lenses, reducing the probability of total reflection between the first and second elements, thereby reducing the generation of stray light ghost images and improving the imaging quality of the lens.

[0090] The optical imaging lens according to the above embodiments of the present application can adopt multiple lenses, for example, eight lenses as described above. By reasonably allocating the refractive power, surface shape of each lens, and the arrangement of each spacer element, etc., the span of each gear of the lens and the lens barrel is relatively uniform, which enhances the ability of light convergence and improves the imaging quality of the optical imaging lens.

[0091] In some embodiments of the present application, the lens material in the optical imaging lens provided by the present application can be glass or plastic. When the lens material is plastic, the production cost can be effectively reduced. When the lens material is glass, the geometric chromatic aberration of the optical imaging lens can be effectively corrected by the low dispersion characteristics of the glass. The optical imaging lens provided by the present application can adopt a full-plastic lens structure, which not only has excellent imaging performance, but also has a compact structure, and can better achieve the balance between miniaturization and high image quality.

[0092] In some embodiments of the present application, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens can adopt a spherical lens or an aspherical lens. Compared with the spherical structure, the aspherical structure can effectively reduce the aberration of the optical imaging lens, thereby reducing the number of lenses and the size of the lenses, and better achieving the miniaturization of the lens. More specifically, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens of the present application can all adopt an aspherical lens, which can effectively reduce the aberration of the optical imaging lens, thereby reducing the number of lenses and the size of the lenses, and achieving the miniaturization of the lens.

[0093] When the lens adopts an aspherical lens, the surface shape of each aspherical lens of the optical imaging lens can be defined by the following aspherical formula, but is not limited thereto:

[0094]

[0095] In the above formula, z is the axial distance from the surface to the vertex at a position along the optical axis and perpendicular to the optical axis with a height of y; c represents the curvature at the vertex of the aspherical surface; k is the conic coefficient; A4, A6, A8, A10, A12, A14, A16, … represent the fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, fourteenth-order, sixteenth-order, … aspherical coefficients, respectively. 10 12 14 16

[0096] The present application will be further described in the following embodiments. In each embodiment, the thickness, the radius of curvature and the material selection of each lens in the optical imaging lens are different, and the specific differences can be referred to the parameter table of each embodiment. The following embodiments are only preferred embodiments of the present application, but the embodiments of the present application are not limited to the following embodiments, and any changes, substitutions, combinations or simplifications made without departing from the innovative points of the present application should be regarded as equivalent replacement methods, and are included in the protection scope of the present application.

[0097] Embodiment one

[0098] The following refers to​​​​Figures 2A to 2G An optical imaging lens of an embodiment of the present application is described. Figure 2A 、 Figure 2B and Figure 2C respectively show structural schematic diagrams of optical imaging lenses 1001, 1002 and 1003 of embodiments of the present application.

[0099] As shown in Figure 2A 、 Figure 2B and Figure 2C , the optical imaging lens comprises a lens barrel, eight lenses and a plurality of spacer elements, the lens barrel comprises, in order from the object side to the image side, a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fifth lens E5, a fifth spacer element P5, a sixth lens E6, a sixth spacer element P6, a seventh lens E7, a seventh spacer element P7, an eighth lens E8 and an eighth spacer element P8.

[0100] Figure 2A is a structural schematic diagram of the optical imaging lens 1001. In this embodiment, the object side surface S1 of the first lens partially contacts the lens barrel; the object side surface and the image side surface of the first spacer element P1 partially contact the image side surface S2 of the first lens and the object side surface S3 of the second lens respectively; the object side surface and the image side surface of the second spacer element P2 partially contact the image side surface S4 of the second lens and the object side surface S5 of the third lens respectively; the object side surface and the image side surface of the third spacer element P3 partially contact the image side surface S6 of the third lens and the object side surface S7 of the fourth lens respectively; the object side surface and the image side surface of the fourth spacer element P4 partially contact the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens respectively; the object side surface and the image side surface of the fifth spacer element P5 partially contact the image side surface S10 of the fifth lens and the object side surface S11 of the sixth lens respectively; the object side surface and the image side surface of the sixth spacer element P6 partially contact the image side surface S12 of the sixth lens and the object side surface S13 of the seventh lens respectively; the object side surface and the image side surface of the seventh spacer element P7 partially contact the image side surface S14 of the seventh lens and the object side surface S15 of the eighth lens respectively; and the object side surface of the eighth spacer element P8 partially contacts the image side surface S16 of the eighth lens.

[0101] Figure 2BFig. 10 is a structural schematic diagram of an optical imaging lens 1002. The difference between the optical imaging lens 1002 and the optical imaging lens 1001 is that a fourth auxiliary spacer element P4b is arranged on the image side of the fourth lens E4. At this time, the image side surface of the fourth spacer element P4 partially contacts the object side surface of the fourth auxiliary spacer element P4b, and the image side surface of the fourth auxiliary spacer element P4b partially contacts the object side surface S9 of the fifth lens. The abutting contact modes of the other spacer elements are the same as those of the optical imaging lens 1001, and the relevant descriptions can be referred to the optical imaging lens 1001, which will not be repeated here.

[0102] Figure 2C Fig. 11 is a structural schematic diagram of an optical imaging lens 1003. The abutting contact modes of the spacer elements are the same as those of the optical imaging lens 1002, and the relevant descriptions can be referred to the optical imaging lens 1002, which will not be repeated here.

[0103] In summary, the structural parameters of the optical imaging lens 1001, the optical imaging lens 1002 and the optical imaging lens 1003 in the embodiment one are shown in Table 9.

[0104] In the embodiment one, the structural schematic diagrams of the optical imaging lens 1001, the optical imaging lens 1002 and the optical imaging lens 1003 adopt the same imaging lens group. The first lens E1 has positive focal power, the object side surface S1 is a convex surface, and the image side surface S2 is a concave surface. The second lens E2 has positive focal power, 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 focal power, the object side surface S5 is a convex surface, and the image side surface S6 is a concave surface. The fourth lens E4 has positive focal power, the object side surface S7 is a convex surface, and the image side surface S8 is a convex surface. The fifth lens E5 has negative focal power, the object side surface S9 is a convex surface, and the image side surface S10 is a concave surface. The sixth lens E6 has negative focal power, the object side surface S11 is a convex surface, and the image side surface S12 is a concave surface. The seventh lens E7 has positive focal power, the object side surface S13 is a convex surface, and the image side surface S14 is a convex surface. The eighth lens E8 has negative focal power, the object side surface S15 is a concave surface, and the image side surface S16 is a concave surface. The light from the object sequentially passes through the surfaces S1 to S16 and is finally imaged on the imaging surface S19. S17 and S18 can be the object side surface and the image side surface of the filter or protective glass, and S19 is the imaging surface (S17, S18, S19 are shown in Fig. 12, and the remaining figures are omitted), OBJ (not shown in the figure) is the object distance, and STO (not shown in the figure) is the stop, which is arranged before the first lens E1. Figure 2A

[0105] Table 2 lists the related parameters of each lens in the optical imaging lens of the embodiment, wherein the units of the curvature radius and the thickness are millimeters (mm).

[0106] Surface No. Surface Type Radius of Curvature Thickness Refractive Index Abbe Number Conic Constant OBJ Sphere Infinity Infinity STO Sphere Infinity -0.3850 S1 Asphere 2.8543 0.4612 1.54 50.58 0.0000 S2 Asphere 2.6995 0.1082 0.0000 S3 Asphere 2.4350 0.5495 1.62 60.57 0.0000 S4 Asphere 8.2233 0.1000 0.0000 S5 Asphere 11.6961 0.3600 1.76 27.58 0.0000 S6 Asphere 3.9042 0.3555 0.0000 S7 Asphere 11.2990 0.7724 1.64 57.06 0.0000 S8 Asphere -6.8693 0.1000 0.0000 S9 Asphere 11.8062 0.3600 1.70 30.17 0.0000 S10 Asphere 4.7353 0.4526 0.0000 S11 Asphere 26.2769 0.7039 1.57 43.61 0.0000 S12 Asphere 5.1413 0.1000 0.0000 S13 Asphere 3.2964 1.1733 1.68 51.20 0.0000 S14 Asphere -13.4404 0.7545 0.0000 S15 Asphere -7.9352 0.3600 1.52 54.95 0.0000 S16 Asphere 3.1962 0.4492 -1.0000 S17 Asphere 0.2100 1.52 64.17 S18 Sphere 0.4900 S19 Sphere 0.0000 ​

[0107] Table 2

[0108] Table 3 lists the aspherical coefficients of each aspherical lens in the optical imaging lens of this embodiment, including: A4, A6, A8, A... 10 A 12 A 14 A 16 A 18 A 20 Among them, each aspherical coefficient satisfies the formula (1) given above.

[0109] Sphere [A4] [A6] [A8] A 10 ]]> A 12 ]]> A 14 ]]> A 16 ]]> S1 -6.7819E-03 -1.1223E-03 2.1250E-03 -2.2444E-03 1.0748E-03 -2.6043E-04 3.2043E-05 S2 -4.1236E-02 -1.8214E-02 5.0272E-02 -8.4173E-02 8.3593E-02 -4.9796E-02 1.7717E-02 S3 -2.9021E-02 -1.3732E-02 3.1484E-02 -5.6817E-02 5.5624E-02 -3.1996E-02 1.1127E-02 S4 -2.4630E-02 1.9718E-02 -1.1354E-02 -7.2114E-03 1.1368E-02 -5.2238E-03 9.3484E-04 S5 -3.2543E-02 3.8731E-02 -2.8812E-02 1.3830E-02 -4.2758E-03 8.2993E-04 -9.3882E-05 S6 -1.0884E-02 2.5836E-02 -2.7835E-02 3.1307E-02 -3.0941E-02 2.1794E-02 -9.7452E-03 S7 -2.2263E-02 3.9941E-03 -2.1794E-02 3.8186E-02 -4.3983E-02 3.2368E-02 -1.4447E-02 S8 -4.7377E-03 -1.1644E-02 1.4761E-04 5.6437E-03 -5.8801E-03 3.4179E-03 -1.1919E-03 S9 1.2855E-02 -7.3206E-03 2.3670E-03 2.1808E-04 -3.1274E-04 7.8967E-05 -9.2555E-06 S10 1.1608E-03 2.3434E-04 -5.6022E-04 3.0072E-04 -6.7311E-05 7.6142E-06 -4.4280E-07 S11 -1.8020E-04 2.4022E-07 3.6779E-09 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S12 -5.8001E-02 1.0042E-02 -1.3258E-03 3.8687E-04 -1.9081E-04 7.6289E-05 -1.6013E-05 S13 -3.7229E-02 1.6051E-03 3.3642E-04 -5.4029E-04 2.0923E-04 -3.6638E-05 3.3178E-06 S14 3.2698E-02 -1.1380E-02 1.9464E-03 -1.8421E-04 9.9062E-06 -2.8182E-07 2.7997E-09 S15 -3.1188E-02 -4.0813E-03 6.1079E-03 -1.9722E-03 3.6127E-04 -4.1216E-05 2.8708E-06 S16 -6.1204E-02 1.2765E-02 -1.9260E-03 1.9914E-04 -1.4144E-05 6.6638E-07 -1.9050E-08 Face No. A 18 ]]> A 20 ]]> S1 -1.6367E-06 0.0000E+00 S2 -3.4712E-03 2.8731E-04 S3 -2.1770E-03 1.8375E-04 S4 7.3628E-07 -1.3225E-05 S5 4.8537E-06 0.0000E+00 S6 2.4683E-03 -2.6859E-04 S7 3.5511E-03 -3.6588E-04 S8 2.2756E-04 -1.8184E-05 S9 5.2019E-07 -1.0874E-08 S10 1.0900E-08 0.0000E+00 S11 0.0000E+00 0.0000E+00 S12 1.5787E-06 -5.8588E-08 S13 -1.5222E-07 2.7937E-09 S14 3.9676E-11 -8.4163E-13 S15 -1.1122E-07 1.8282E-09 S16 2.8075E-10 -1.4296E-12

[0110] Table 3

[0111] Face No. The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 1 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 2D The astigmatism curve of the optical imaging lens of Embodiment 1 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 2E The distortion curve of the optical imaging lens of Embodiment 1 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 2F The magnification chromatic aberration curve of the optical imaging lens of Embodiment 1 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to... Figure 2G As can be seen, the optical imaging lens given in Example 1 can achieve good imaging quality.

[0112] Example 2

[0113] The following is for reference Figures 2D to 2G An optical imaging lens according to Embodiment 2 of this application is described. Figures 3A to 3G , Figure 3A and Figure 3B The following are schematic diagrams showing the structures of optical imaging lens 2001, optical imaging lens 2002 and optical imaging lens 2003 according to Embodiment 2 of this application.

[0114] like Figure 3C , Figure 3A and Figure 3B As shown, the optical imaging lens includes a lens barrel, eight lenses, and multiple spacer elements. The lens barrel includes, in order from the object side to the image side, a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fifth lens E5, a fifth spacer element P5, a sixth lens E6, a sixth spacer element P6, a seventh lens E7, a seventh spacer element P7, an eighth lens E8, and an eighth spacer element P8.

[0115] Figure 3C Figure 6 is a structural schematic diagram of an optical imaging lens 2001. In this embodiment, the object side S1 of the first lens is in contact with the lens barrel portion; the object side and the image side of the first spacer element P1 are in partial contact with the image side S2 of the first lens and the object side S3 of the second lens, respectively; the object side and the image side of the second spacer element P2 are in partial contact with the image side S4 of the second lens and the object side S5 of the third lens, respectively; the object side and the image side of the third spacer element P3 are in partial contact with the image side S6 of the third lens and the object side S7 of the fourth lens, respectively; the object side and the image side of the fourth spacer element P4 are in partial contact with the image side S8 of the fourth lens and the object side S9 of the fifth lens, respectively; the object side and the image side of the fifth spacer element P5 are in partial contact with the image side S10 of the fifth lens and the object side S11 of the sixth lens, respectively; the object side and the image side of the sixth spacer element P6 are in partial contact with the image side S12 of the sixth lens and the object side S13 of the seventh lens, respectively; the object side and the image side of the seventh spacer element P7 are in partial contact with the image side S14 of the seventh lens and the object side S15 of the eighth lens, respectively; and the object side of the eighth spacer element P8 is in partial contact with the image side S16 of the eighth lens.

[0116] Figure 3A Figure 7 is a structural schematic diagram of an optical imaging lens 2002. The difference between the optical imaging lens 2002 and the optical imaging lens 2001 is that the image side of the fourth lens E4 is further provided with a fourth auxiliary spacer element P4b, at this time, the image side of the fourth spacer element P4 is in partial contact with the object side of the fourth auxiliary spacer element P4b, and the image side of the fourth auxiliary spacer element P4b is in partial contact with the object side S9 of the fifth lens. The abutting contact mode of the remaining spacer elements is the same as that of the optical imaging lens 2001, and reference can be made to the related description in the optical imaging lens 2001, which will not be described herein.

[0117] Figure 3B Figure 8 is a structural schematic diagram of an optical imaging lens 2003; the abutting contact mode of the spacer elements is the same as that of the optical imaging lens 2002, and reference can be made to the related description in the optical imaging lens 2002, which will not be described herein.

[0118] In summary, the structural parameters of the optical imaging lens 2001, the optical imaging lens 2002, and the optical imaging lens 2003 in Embodiment 2 are shown in Table 9.

[0119] In the embodiment two, the structure diagram of the optical imaging lens 2001, the optical imaging lens 2002 and the optical imaging lens 2003 adopts the same imaging lens group, the first lens E1 has negative refractive power, the object side S1 is a convex surface, and the image side S2 is a concave surface. The second lens E2 has positive refractive power, the object side S3 is a convex surface, and the image side S4 is a concave surface. The third lens E3 has negative refractive power, the object side S5 is a convex surface, and the image side S6 is a concave surface. The fourth lens E4 has positive refractive power, the object side S7 is a convex surface, and the image side S8 is a convex surface. The fifth lens E5 has negative refractive power, the object side S9 is a convex surface, and the image side S10 is a concave surface. The sixth lens E6 has negative refractive power, the object side S11 is a concave surface, and the image side S12 is a concave surface. The seventh lens E7 has positive refractive power, the object side S13 is a convex surface, and the image side S14 is a convex surface. The eighth lens E8 has negative refractive power, the object side S15 is a concave surface, and the image side S16 is a concave surface. The light from the object sequentially passes through the surfaces S1 to S16 and is finally imaged on the imaging surface S19, wherein S17 and S18 (not shown in the figure) can be the object side and the image side of the filter or the protective glass, S19 (not shown in the figure) is the imaging surface, OBJ (not shown in the figure) is the object distance, and STO (not shown in the figure) is the diaphragm, which is arranged in front of the first lens E1.

[0120] Table 4 lists the related parameters of each lens in the optical imaging lens of the embodiment, wherein the units of the curvature radius and the thickness are millimeters mm.

[0121]

[0122]

[0123] Table 4

[0124] Table 5 lists the aspheric coefficients of each aspheric lens in the optical imaging lens of the embodiment, including: A4, A6, A8, A 10 , A 12 , A 14 , A 16 , A 18 , A 20 . Wherein each aspheric coefficient satisfies the formula (1) given above.

[0125]

[0126]

[0127] Table 5

[0128] Figure 3C The on-axis chromatic aberration curve of the optical imaging lens of the embodiment two is shown, which represents the convergence focus deviation of light rays of different wavelengths after passing through the lens. Figure 3DAstigmatism curves of the optical imaging lens according to Embodiment Two are shown, which represent meridional image surface curvature and sagittal image surface curvature. Figure 3E Distortion curves of the optical imaging lens according to Embodiment Two are shown, which represent distortion size values corresponding to different image heights. Figure 3F Distortion curves of the optical imaging lens according to Embodiment Two are shown, which represent distortion size values corresponding to different image heights. Figure 3G It can be known that the optical imaging lens according to Embodiment Two can achieve good imaging quality.

[0129] Embodiment Three

[0130] The following refers to Figures 3D to 3G An optical imaging lens according to Embodiment Three of the present application is described. Figures 4A to 4G 、 Figure 4A and Figure 4B respectively show structural schematic diagrams of optical imaging lenses 3001, 3002 and 3003 according to Embodiment Three of the present application.

[0131] As shown in Figure 4C 、 Figure 4A and Figure 4B , the optical imaging lens comprises a lens barrel, eight lenses and a plurality of spacer elements, the lens barrel comprising, in order from the object side to the image side, a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fourth auxiliary spacer element P4b, a fifth lens E5, a fifth spacer element P5, a fifth auxiliary spacer element P5b, a sixth lens E6, a sixth spacer element P6, a seventh lens E7, a seventh spacer element P7, an eighth lens E8 and an eighth spacer element P8.

[0132] Figure 4CFig. 3 is a structural schematic diagram of an optical imaging lens 3001. In the embodiment, the object side S1 of the first lens is in contact with the lens barrel portion; the object side and the image side of the first spacer element P1 are in partial contact with the image side S2 of the first lens and the object side S3 of the second lens, respectively; the object side and the image side of the second spacer element P2 are in partial contact with the image side S4 of the second lens and the object side S5 of the third lens, respectively; the object side and the image side of the third spacer element P3 are in partial contact with the image side S6 of the third lens and the object side S7 of the fourth lens, respectively; the object side and the image side of the fourth spacer element P4 are in partial contact with the image side S8 of the fourth lens and the object side of the fourth auxiliary spacer element P4b, respectively, and the image side of the fourth auxiliary spacer element P4b is in partial contact with the object side S9 of the fifth lens; the object side and the image side of the fifth spacer element P5 are in partial contact with the image side S10 of the fifth lens and the object side S11 of the sixth lens, respectively; the object side and the image side of the sixth spacer element P6 are in partial contact with the image side S12 of the sixth lens and the object side S13 of the seventh lens, respectively; the object side and the image side of the seventh spacer element P7 are in partial contact with the image side S14 of the seventh lens and the object side S15 of the eighth lens, respectively; and the object side of the eighth spacer element P8 is in partial contact with the image side S16 of the eighth lens.

[0133] Figure 4A Fig. 4 is a structural schematic diagram of an optical imaging lens 3002; the contact modes of the spacer elements are the same as those of the optical imaging lens 3001, and the relevant descriptions in the optical imaging lens 3001 can be referred to, and thus are not described herein.

[0134] Figure 4B Fig. 5 is a structural schematic diagram of an optical imaging lens 3003; the contact modes of the spacer elements are the same as those of the optical imaging lens 3001, and the relevant descriptions in the optical imaging lens 3001 can be referred to, and thus are not described herein.

[0135] In summary, the structural parameters of the optical imaging lens 3001, the optical imaging lens 3002, and the optical imaging lens 3003 in Embodiment Three are shown in Table 9.

[0136] In embodiment three, the structure schematic diagram of optical imaging lens 3001, optical imaging lens 3002 and optical imaging lens 3003 adopts the same imaging lens group, the first lens E1 has negative refractive power, the object side S1 is a convex surface, and the image side S2 is a concave surface. The second lens E2 has positive refractive power, the object side S3 is a convex surface, and the image side S4 is a concave surface. The third lens E3 has negative refractive power, the object side S5 is a convex surface, and the image side S6 is a concave surface. The fourth lens E4 has positive refractive power, the object side S7 is a convex surface, and the image side S8 is a convex surface. The fifth lens E5 has negative refractive power, the object side S9 is a convex surface, and the image side S10 is a concave surface. The sixth lens E6 has negative refractive power, the object side S11 is a convex surface, and the image side S12 is a concave surface. The seventh lens E7 has positive refractive power, the object side S13 is a convex surface, and the image side S14 is a convex surface. The eighth lens E8 has negative refractive power, the object side S15 is a convex surface, and the image side S16 is a concave surface. The light from the object sequentially passes through each surface S1 to S16 and is finally imaged on the imaging surface S19, wherein S17 and S18 (not shown in the figure) can be the object side and image side of the filter or protective glass, S19 (not shown in the figure) is the imaging surface, OBJ (not shown in the figure) is the object distance, and STO (not shown in the figure) is the diaphragm, which is arranged before the first lens E1.

[0137] Table 6 lists the related parameters of each lens in the optical imaging lens of the present embodiment, wherein the units of the curvature radius and the thickness are millimeters (mm).

[0138] Figure 4C Surface No. Surface Type Radius of Curvature Thickness Refractive Index Abbe Number Conic Constant OBJ Sphere Infinity Infinity STO Sphere 0.1000 S1 Infinity 2.7998 0.4636 1.55 56.72 -1.0000 S2 Asphere 2.6174 0.1383 0.0000 S3 Asphere 2.3550 0.6083 1.63 58.93 0.0000 S4 Asphere 11.2292 0.1000 0.0000 S5 Asphere 11.8691 0.2800 1.76 27.58 0.0000 S6 Asphere 3.3393 0.4400 0.0000 S7 Asphere 11.1105 1.0169 1.66 54.08 0.0000 S8 Asphere -6.1786 0.1000 0.0000 S9 Asphere 9.0576 0.2800 1.76 27.58 0.0000 S10 Asphere 4.2836 0.5254 0.0000 S11 Asphere 42.7163 0.4569 1.75 38.47 0.0000 S12 Asphere 5.6694 0.1000 0.0000 S13 Asphere 2.9183 0.7703 1.74 44.85 -1.0000 S14 Asphere -10.3156 0.4939 -1.0000 S15 Asphere 4.9686 0.4093 1.69 40.39 0.0000 S16 Asphere 1.6939 0.5491 -1.0000 S17 Asphere 0.2100 1.52 64.17 S18 Asphere 0.4900 S19 Sphere 0.0000

[0139] Table 6

[0140] Table 7 lists the aspherical coefficients of each aspherical lens in the optical imaging lens of the present embodiment, including: A4, A6, A8, 10 , A 12 , A 14 , A 16 , A 18 , A 20 . Wherein each aspherical coefficient satisfies the formula (1) given above.

[0141]

[0142]

[0143] Table 7

[0144] Sphere The axial chromatic aberration curve of the optical imaging lens of embodiment three is shown, which represents the convergence focus deviation of light of different wavelengths after passing through the lens. Sphere The astigmatism curve of the optical imaging lens of embodiment three is shown, which represents the meridional image surface curvature and sagittal image surface curvature.Figure 4D The distortion curve of the optical imaging lens of Embodiment Three is shown, which represents the distortion size values corresponding to different image heights. Figure 4E The magnification chromatic aberration curve of the optical imaging lens of Embodiment Three is shown, which represents the deviation of light rays on the imaging surface at different image heights after passing through the lens. According to the formula Figure 4F It can be seen that the optical imaging lens given in Embodiment Three can achieve good imaging quality.

[0145] In summary, the optical parameters of the optical imaging lenses 1001, 1002, 1003, 2001, 2002, 2003, 3001, 3002 and 3003 in Embodiments One to Three are shown in Table 8.

[0146]

[0147]

[0148] Table 8

[0149] The structural parameters of the optical imaging lenses 1001, 1002, 1003, 2001, 2002, 2003, 3001, 3002 and 3003 in Embodiments One to Three are shown in Table 9, with units in millimeters (mm).

[0150] Figure 4G Figures 4D to 4G Structure Parameter Lens 1001 Lens 1002 Lens 1003 Lens 2001 Lens 2002 Lens 2003 Lens 3001 Lens 3002 3.0185 3.0185 3.1185 3.3210 3.3210 3.4210 3.2177 3.2177 3.3177 Lens 3003 5.0314 5.9300 6.0300 6.1858 7.1563 7.2563 5.2338 6.2065 6.3065 d1m 2.9630 2.9630 3.0630 3.2486 3.2486 3.3486 3.2097 3.2097 3.3097 D1m 2.9630 2.9630 3.0630 3.2486 3.2486 3.3486 3.2097 3.2097 3.3097 d2s 5.0217 6.1945 6.2945 6.1661 7.4838 7.5838 5.2258 6.5339 6.6339 d2m 5.2283 6.6348 6.7348 6.3785 7.6879 7.7879 5.4208 6.8388 6.9388 D2m 3.5879 4.9982 5.0982 3.9853 6.0580 6.1580 5.4331 5.4351 5.5331 D3m 6.9462 6.7877 6.8877 6.5821 7.8475 7.9311 7.2225 7.2825 7.3225 d4m 7.1871 7.3122 7.4122 8.0324 8.1995 8.2995 7.8307 7.8357 7.9307 D4m 4.0108 4.0321 4.1321 4.3766 4.4527 4.5527 4.3277 4.3217 4.4277 D5s 4.7250 4.7355 4.8355 4.8460 4.9148 5.0148 4.8519 4.8569 4.9519 d5s 5.9940 6.0226 6.1226 6.1580 6.1161 6.2161 5.6927 5.6927 5.7927 d6s 6.1090 6.0022 6.1022 7.2629 6.8311 6.9311 6.3130 6.3130 6.4130 d7s 1.1498 1.1823 1.1323 1.1190 1.1303 1.1503 1.2025 1.1626 1.2126 d0s 0.3936 0.3880 0.3880 0.4421 0.4391 0.4391 0.3459 0.4356 0.3785 EP01 0.9234 0.6693 0.6204 1.1047 0.8890 0.7582 0.9032 0.8586 0.8086 EP12 0.7908 0.7317 0.7719 0.8887 0.7711 0.7961 0.7328 0.7775 0.7947 EP34 0.6983 0.7249 0.6847 0.3813 0.4101 0.4560 0.4697 0.4885 0.4557 EP45 1.1904 1.1491 1.2019 1.0872 1.0518 1.0059 0.8368 0.8181 0.8835 EP56 0.7686 0.7686 0.7157 0.7666 0.7666 0.7666 1.0237 1.0237 0.9538 L 7.6863 7.6899 7.6886 7.6863 7.6863 7.6863 7.6863 7.6863 7.6863 EP67 EP78 CP3 0.0220 0.0220 0.0220 0.0220 0.0220 0.0220 0.0220 0.0220 0.0220

[0151] Table 9

[0152] The optical imaging lenses 1001, 1002, 1003, 2001, 2002, 2003, 3001, 3002 and 3003 in Embodiments One to Three satisfy the relationships shown in Table 10.

[0153]

[0154]

[0155] Table 10

[0156] The above description is merely preferred embodiments of the present application and a principle of applied technologies. It is understood by those skilled in the art that the scope of the application 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 combinations of the technical features described above or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by mutually replacing the above-described features and the technical features disclosed in the present application (but not limited to) having similar functions.

Claims

1. An optical imaging lens comprising a lens barrel, and an imaging lens group and a plurality of spacer elements accommodated in the lens barrel, characterized in that, the imaging lens group comprises, in order from the object side to the image side along the optical axis, a first lens having optical power, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, with air gaps between adjacent lenses; the plurality of spacer elements comprises a first spacer element located between the first lens and the second lens and at least partially abutting against the image side surface of the first lens, and a second spacer element located between the second lens and the third lens and at least partially abutting against the image side surface of the second lens; the optical imaging lens satisfies 10.30≤L / (CT2+T12)≤11.69 and 11.34≤f12 / EP12≤14.77; 0.83≤(D1m-d1m) / R3≤1.56 and 2.68≤R4 / d2s≤3.50; wherein L is the maximum height of the lens barrel, CT2 is the thickness of the second lens on the optical axis, T12 is the air gap between the first lens and the second lens on the optical axis, f12 is the combined focal length of the first lens and the second lens, EP12 is the distance from the image side surface of the first spacer element to the object side surface of the second spacer element along the optical axis, R3 is the radius of curvature of the object side surface of the second lens, D1m is the outer diameter of the image side surface of the first spacer element, d1m is the inner diameter of the image side surface of the first spacer element, 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 spacer element. 2.The optical imaging lens according to claim 1, wherein, the plurality of spacer elements further comprises a third spacer element located between the third lens and the fourth lens and at least partially abutting against the image side surface of the third lens; the optical imaging lens satisfies 1.60≤R7 / D3m≤2.27; wherein R7 is the radius of curvature of the object side surface of the fourth lens, and D3m is the outer diameter of the image side surface of the third spacer element. 3.The optical imaging lens according to claim 2, wherein, the plurality of spacer elements further comprises a fourth spacer element located between the fourth lens and the fifth lens and at least partially abutting against the image side surface of the fourth lens; the optical imaging lens satisfies 6.25≤f4 / (CP3+EP34)≤10.60; wherein f4 is the effective focal length of the fourth lens, CP3 is the thickness of the third spacer element along the optical axis, and EP34 is the distance from the image side surface of the third spacer element to the object side surface of the fourth spacer element along the optical axis.

4. The optical imaging lens according to claim 3, characterized in that, the optical imaging lens satisfies 1.50≤R9 / d4m≤3.29; wherein R9 is the radius of curvature of the object side surface of the fifth lens, and d4m is the inner diameter of the image side surface of the fourth spacer element.

5. The optical imaging lens according to claim 3, characterized in that, the plurality of spacer elements further comprises a fifth spacer element located between the fifth lens and the sixth lens and at least partially abutting against the image side surface of the fifth lens; the optical imaging lens satisfies 0.30≤(D5s-D4m) / EP45≤1.63; Wherein, D5s is the outer diameter of the object side surface of the fifth spacer element, D4m is the outer diameter of the image side surface of the fourth spacer element, EP45 is the distance from the image side surface of the fourth spacer element to the object side surface of the fifth spacer element along the optical axis direction. 6.The optical imaging lens according to claim 5, wherein, The optical imaging lens satisfies: 4.59≤d5s / (CT5+T56)≤5.5; Wherein, d5s is the inner diameter of the object side surface of the fifth spacer element, CT5 is the thickness of the fifth lens on the optical axis, T56 is the air gap of the fifth lens and the sixth lens on the optical axis. 7.The optical imaging lens according to claim 5, wherein, The plurality of spacer elements further comprises a sixth spacer element located between the sixth lens and the seventh lens and at least partially abutting against the image side surface of the sixth lens; a seventh spacer element located between the seventh lens and the eighth lens and at least partially abutting against the image side surface of the seventh lens; The optical imaging lens satisfies: 1.59≤EP67 / EP56≤2.85; Wherein, EP56 is the distance from the image side surface of the fifth spacer element to the object side surface of the sixth spacer element along the optical axis direction, EP67 is the distance from the image side surface of the sixth spacer element to the object side surface of the seventh spacer element along the optical axis direction. 8.The optical imaging lens according to claim 7, wherein, The optical imaging lens satisfies: 3.34≤f7 / EP67≤4.02; Wherein, f7 is the effective focal length of the seventh lens, EP67 is the distance from the image side surface of the sixth spacer element to the object side surface of the seventh spacer element along the optical axis direction. 9.The optical imaging lens according to claim 7, wherein, The optical imaging lens satisfies: -2.41≤f6 / d6s≤-1.78; Wherein, f6 is the effective focal length of the sixth lens, d6s is the inner diameter of the object side surface of the sixth spacer element.

10. The optical imaging lens according to claim 7, characterized in that, The plurality of spacer elements further comprises an eighth spacer element located between the eighth lens and the image plane and at least partially abutting against the image side surface of the eighth lens; The optical imaging lens satisfies: 0.88≤(CT8+T78) / EP78≤1.56; Wherein, CT8 is the thickness of the eighth lens on the optical axis, T78 is the air gap of the seventh lens and the eighth lens on the optical axis, EP78 is the distance from the image side surface of the seventh spacer element to the object side surface of the eighth spacer element along the optical axis direction.

Images