Optical imaging lens

Abstract

This invention relates to an optical imaging lens, comprising a lens barrel and an imaging lens group and a plurality of spacer elements housed within the lens barrel. The imaging lens group, along the optical axis from the object side to the image side, 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, each having optical power, with air gaps between adjacent lenses. The plurality of spacer elements includes a first spacer element located between the first and second lenses and at least partially abutting the image-side surface of the first lens; and a second spacer element located between the second and third lenses and at least partially abutting the image-side surface 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, 2.68≤R4 / d2s≤3.50. The optical imaging lens of this invention can effectively block stray light and improve image quality by utilizing spacer elements while maintaining a compact internal structure.

Description

Technical Field

[0001] This invention relates to the field of imaging lens technology, and more particularly to an optical imaging lens. Background Technology

[0002] In today's digital age, mobile devices have become essential tools for people to record their lives and access information. Users' demands for device shooting capabilities are constantly increasing, expecting clear, detailed, and artistic images even in complex environments. With the development of smartphone photography technology, the internal space of smartphones is gradually becoming more compact, leaving limited space for the lens module. If the lens is too large, it will squeeze the space of other important components. Furthermore, the air gaps between lenses in optical imaging lenses are small, especially in sensitive air gaps, where light interference during transmission can easily generate stray light, leading to edge field-of-view dispersion and affecting image quality. Summary of the Invention

[0003] To address the problems existing in the prior art, the present invention aims to provide an optical imaging lens that can effectively block stray light and improve imaging quality by utilizing spacer elements while ensuring a compact internal structure.

[0004] To achieve the above-mentioned objective, the present invention provides an optical imaging lens, including a lens barrel and an imaging lens group and a plurality of spacer elements housed within the lens barrel;

[0005] The imaging lens group includes, in sequence along the optical axis from the object side to the image side: 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, each having optical power, with air gaps between adjacent lenses;

[0006] The plurality of spacers include a first spacer located between the first lens and the second lens and at least partially abutting the image side of the first lens; and a second spacer located between the second lens and the third lens and at least partially abutting the image side 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 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 along the optical axis from the image side of the first spacer element to the object side of the second spacer element, R3 is the radius of curvature of the object side of the second lens, D1m is the outer diameter of the image side of the first spacer element, d1m is the inner diameter of the image side of the first spacer element, R4 is the radius of curvature of the image side of the second lens, and d2s is the inner diameter of the object side of the second spacer element.

[0010] According to one technical solution of the present invention, the plurality of spacer elements further includes a third spacer element located between the third lens and the fourth lens, and at least partially abutting the image side of the third lens;

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

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

[0013] According to one technical solution of the present invention, the plurality of spacer elements further includes a fourth spacer element located between the fourth lens and the fifth lens, and at least partially abutting the image side 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, and EP34 is the distance from the image side of the third spacer element to the object side of the fourth spacer element along the optical axis.

[0016] According to one technical solution of the present invention, the optical imaging lens satisfies: 1.50≤R9 / d4m≤3.29;

[0017] 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.

[0018] According to one technical solution of the present invention, the plurality of spacer elements further includes a fifth spacer element located between the fifth lens and the sixth lens, and at least partially abutting the image side of the fifth lens;

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

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

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

[0022] Wherein, d5s is the inner diameter of the object side of the fifth spacer element, CT5 is the thickness of the fifth lens on the optical axis, and T56 is the air gap between the fifth lens and the sixth lens on the optical axis.

[0023] According to one technical solution of the present invention, the plurality of spacer elements further includes 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; and 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;

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

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

[0026] According to one technical solution of the present invention, the optical imaging lens satisfies: 3.34≤f7 / EP67≤4.02;

[0027] Where f7 is the effective focal length of the seventh lens, and EP67 is the distance along the optical axis from the image side of the sixth spacer to the object side of the seventh spacer.

[0028] According to one technical solution of the present invention, the optical imaging lens satisfies: -2.41≤f6 / d6s≤-1.78;

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

[0030] According to one technical solution of the present invention, the optical imaging lens satisfies: 5.11≤d7s / CT7≤7.52;

[0031] Wherein, d7s is the inner diameter of the object side of the seventh spacer element, and CT7 is the thickness of the seventh lens on the optical axis.

[0032] According to one technical solution of the present invention, the plurality of spacer elements further includes an eighth spacer element located between the eighth lens and the image plane, and at least partially abutting 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 between the seventh lens and the eighth lens on the optical axis, and EP78 is the distance along the optical axis from the image side of the seventh spacer element to the object side of the eighth spacer element.

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

[0036] Where 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 technical solution of the present invention, the optical imaging lens satisfies: 5.08≤d0s / EP01≤6.49;

[0038] Wherein, d0s is the inner diameter of the object-side end face of the lens barrel, and EP01 is the distance between the object-side end face of the lens barrel and the object-side surface of the first spacer along the optical axis.

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

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

[0041] The optical imaging lens of this application uses eight lenses with optical power and at least one spacer element, arranged sequentially from the first to the eighth lens with intervals. The maximum height L of the lens barrel, the thickness CT2 of the second lens on the optical axis, and the air gap T12 between the first and second lenses on the optical axis satisfy 10.30≤L / (CT2+T12)≤11.69; the combined focal length f12 of the first and second lenses, and the distance EP12 from the image side of the first spacer element to the object side of the second spacer element along the optical axis satisfy 11.34≤f12 / EP12≤14.77. This effectively optimizes the overall height layout and light refraction and convergence efficiency of the lens, achieving a compact design of the optical imaging lens. In this design, the thickness and air gap of the second lens structure area are relatively sensitive. The combined optical power of the first two lenses will interfere with its adjacent spacer element during the transmission process into the second lens, resulting in more chaotic light rays at the lens edge, causing a large dispersion in the defocus curve and affecting the image quality of the lens. By rationally controlling the ratio of (D1m-d1m) / R3 to R4 / d2s, this application can ensure that the first spacer effectively blocks stray light when light passes through the second lens. 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, the two work together to form an aperture constraint, which helps to make the light propagate to the subsequent optical elements at a uniform and reasonable angle, reduce light scattering and interference, and thus improve the overall image quality of the optical imaging lens. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0043] Figure 1 A structural layout diagram and schematic diagram of some parameters of an optical imaging lens according to the present invention are shown;

[0044] Figure 2A , Figure 2B , Figure 2C A schematic diagram of the structure of three optical imaging lenses according to Embodiment 1 of this application is shown;

[0045] Figure 2D , Figure 2E , Figure 2F and Figure 2G The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens according to Embodiment 1 of this application are shown respectively.

[0046] Figure 3A , Figure 3B , Figure 3C A schematic diagram of the structure of three optical imaging lenses according to Embodiment 2 of this application is shown;

[0047] Figure 3D , Figure 3E , Figure 3F and Figure 3G The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens according to Embodiment 2 of this application are shown respectively.

[0048] Figure 4A , Figure 4B , Figure 4C A schematic diagram of the structure of three optical imaging lenses according to Embodiment 3 of this application is shown;

[0049] Figure 4D , Figure 4E , Figure 4F and Figure 4G The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens according to Embodiment 3 of this application are shown respectively.

[0050] Figure 5 The MTF defocus curve of the optical imaging lens of Example 1 is shown when L / (CT2+T12)=11.25, f12 / EP12=13.50, (D1m-d1m) / R3=0.60, and R4 / d2s=2.50.

[0051] Figure 6 The MTF defocus curve of the optical imaging lens of Scheme 1 of this application is shown when L / (CT2+T12)=11.25, f12 / EP12=13.50, (D1m-d1m) / R3=1.10, and R4 / d2s=2.10.

[0052] Figure 7 The MTF defocus curve of the optical imaging lens of Scheme 2 of this application is shown when L / (CT2+T12)=11.25, f12 / EP12=13.50, (D1m-d1m) / R3=1.50, and R4 / d2s=30.

[0053] Figure 8 The MTF defocus curve of the optical imaging lens in Example 2 is shown when L / (CT2+T12)=11.25, f12 / EP12=13.50, (D1m-d1m) / R3=1.60, and R4 / d2s=3.70.

[0054] The above figures include the following reference numerals:

[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 of the first lens. Side view; S3, object side of the second lens; S4, image side of the second lens; S5, object side of the third lens; S6, image side of the third lens; S7, object side of the fourth lens; S8, image side of the fourth lens; S9, object side of the fifth lens; S10, image side of the fifth lens; S11, object side of the sixth lens; S12, image side of the sixth lens; S13, object side of the seventh lens; S14, image side of the seventh lens; S15, object side of the eighth lens; S16, image side of the eighth lens. Detailed Implementation

[0056] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0057] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the third lens, or the first lens may also be referred to as the first lens element.

[0058] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not strictly to scale.

[0059] In this paper, the paraxial region refers to the area near the optical axis. If the lens surface is convex and its location is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and its location is not defined, it means that the lens surface is concave at least in the paraxial region. The surface shape in the paraxial region can be determined by the sign of the R value (R refers to the radius of curvature of the paraxial region). In this paper, the surface of each lens closest to the subject is called the object-side surface, and the surface of each lens closest to the image plane is called the image-side surface. For the object-side surface, when the R value is positive, it is considered convex, and when the R value is negative, it is considered concave; for the image-side surface, when the R value is positive, it is considered concave, and when the R value is negative, it is considered convex.

[0060] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0061] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formalized sense, unless expressly so specified herein.

[0062] It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other. The following embodiments only illustrate several implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be pointed out that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of this application, and these all fall within the protection scope of this application.

[0063] like Figure 1As shown, the imaging lens group of an exemplary embodiment of the present invention includes eight lenses with optical power, which are sequentially included from the object side to the image side along the optical axis as follows: 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 there is an air gap between each lens on the optical axis.

[0064] The plurality of spacers include a first spacer located between a first lens and a second lens and in at least partial contact with the image-side surface of the first lens; a second spacer located between a second lens and a third lens and in at least partial contact with the image-side surface of the second lens; a third spacer located between a third lens and a fourth lens and in at least partial contact with the image-side surface of the third lens; a fourth spacer located between a fourth lens and a fifth lens and in at least partial contact with the image-side surface of the fourth lens; a fifth spacer located between a fifth lens and a sixth lens and in at least partial contact with the image-side surface of the fifth lens; a sixth spacer located between a sixth lens and a seventh lens and in at least partial contact with the image-side surface of the sixth lens; a seventh spacer located between a seventh lens and an eighth lens and in at least partial contact with the image-side surface of the seventh lens; and an eighth spacer located between the eighth lens and the image plane and at least partially abutting against the image-side surface of the eighth lens.

[0065] The imaging lens group and multiple spacer elements are housed within the lens barrel, which includes an object-side end face, an image-side end face, an outer ring surface, and an inner ring surface. Along the optical axis of the optical imaging lens, the inner ring surface of the lens barrel is stepped.

[0066] In some embodiments of the present invention, the optical imaging lens may 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] This application provides an optical imaging lens, including an imaging lens group and a plurality of spacer elements; the imaging lens group includes 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 arranged sequentially along the optical axis from the object side to the image side; the plurality of spacer elements include a first spacer element located between the first lens and the second lens and at least partially abutting the image side 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 of the second lens;

[0068] Optical imaging lenses meet the following requirements:

[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] Where L is the maximum height of the lens barrel, CT2 is the distance between the object-side end face and the image-side end face of the lens barrel along the optical axis, T12 is the thickness of the second lens along the optical axis, T12 is the air gap between the first and second lenses along the optical axis, f12 is the combined focal length of the first and second lenses, EP12 is the distance between the image-side surface of the first spacer element and 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] When the optical imaging lens satisfies 10.30≤L / (CT2+T12)≤11.69 and 11.34≤f12 / EP12≤14.77, the overall height layout and light refraction and convergence efficiency of the lens can be effectively optimized, achieving a compact design. 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 the transmission process into the second lens, resulting in more chaotic light at the lens edge and causing a large dispersion in the defocus curve, affecting the image quality of the lens. This application, by reasonably controlling the ratio of (D1m-d1m) / R3 to R4 / d2s, can ensure that the first spacer element effectively blocks stray light when the light passes through the second lens. 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 work together to form an aperture constraint, which helps the light to propagate to the subsequent optical elements at a uniform and reasonable angle, reducing light scattering and interference, thereby improving the overall image quality of the optical imaging lens.

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

[0074] Therefore, when 10.30≤L / (CT2+T12)≤11.69, 11.34≤f12 / EP12≤14.77 and 0.83≤(D1m-d1m) / R3≤1.56 and 2.68≤R4 / d2s≤3.50 are satisfied, the overall height layout of the lens and the light refraction and convergence efficiency can be optimized. At the same time, stray light is effectively blocked, which helps the light to propagate to the subsequent optical elements at a uniform and reasonable angle, reduces light scattering and interference, and thus improves the overall image quality of the optical imaging lens.

[0075] 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 invention, the plurality of spacers further include a third spacer located between the third lens and the fourth lens and at least partially abutting the image side of the third lens; the radius of curvature R7 of the object side of the fourth lens and the outer diameter D3m of the image side of the third spacer satisfy: 1.60≤R7 / D3m≤2.27; this is beneficial to improve the reflection problem between the outer lens barrel of the fourth lens and the third lens, thereby reducing stray light and improving the imaging quality of the lens.

[0078] In some embodiments of the present invention, the plurality of spacers further include a fourth spacer located between the fourth lens and the fifth lens, and at least partially abutting the image side of the fourth lens; the effective focal length f4 of the fourth lens and the thickness CP3 of the third spacer along the optical axis, and the distance EP34 from the image side of the third spacer to the object side of the fourth spacer along the optical axis satisfy: 6.25≤f4 / (CP3+EP34)≤10.60; this can have a positive impact on the magnification and chromatic aberration correction of the middle of the imaging system, so that the middle of the imaging system has a large magnification and takes into account chromatic aberration correction, thereby ensuring high magnification and image clarity of the lens imaging.

[0079] In some embodiments of the present invention, the radius of curvature R9 of the object side of the fifth lens and the inner diameter d4m of the image side of the fourth spacer element satisfy the following condition: 1.50≤R9 / d4m≤3.29; this ensures that sufficient light enters the fifth lens and reduces ghost images caused by reflections between the fourth and fifth lenses, thereby improving image quality.

[0080] In some embodiments of the present invention, the plurality of spacers further includes a fifth spacer 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, the outer diameter D4m of the image-side surface of the fourth spacer, and the distance EP45 between the image-side surface of the fourth spacer and the object-side surface of the fifth spacer along the optical axis satisfy the following: 0.30≤(D5s-D4m) / EP45≤1.63; by controlling the difference in outer diameter between the object-side surface of the fifth spacer and the image-side surface of the fourth spacer, stray light rays can be effectively blocked. Simultaneously controlling the distance between the fourth and fifth spacers parallel to the optical axis ensures sufficient space, contributing to the assembly stability of the lens.

[0081] In some embodiments of the present invention, the inner diameter d5s of the side of the fifth spacer element, the thickness CT5 of the fifth lens on the optical axis, and the air gap T56 between the fifth lens and the sixth lens on the optical axis satisfy the following: 4.59≤d5s / (CT5+T56)≤5.5; this ensures that the fifth lens has sufficient mechanical strength, while avoiding stray light caused by excessive air gap between the fifth lens and the sixth lens, thus ensuring the stability of the lens's optical performance.

[0082] In some embodiments of the present invention, the plurality of spacers further include a sixth spacer located between the sixth lens and the seventh lens and at least partially abutting the image side of the sixth lens; and a seventh spacer located between the seventh lens and the eighth lens and at least partially abutting the image side of the seventh lens; the distance EP56 between the image side of the fifth spacer and the object side of the sixth spacer along the optical axis and the distance EP67 between the image side of the sixth spacer and the object side of the seventh spacer along the optical axis 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 and seventh lenses is controlled, while ensuring the forming of the sixth and seventh lenses.

[0083] In some embodiments of the present invention, the effective focal length f7 of the seventh lens and the distance EP67 from the image side of the sixth spacer element to the object side of the seventh spacer element along the optical axis satisfy: 3.34≤f7 / EP67≤4.02; this enables light to be effectively focused when passing through the seventh lens, reducing spherical aberration and astigmatism caused by inhomogeneous refraction during light propagation; while maintaining the compactness of the optical imaging lens, it optimizes the focusing effect of the beam, improves image quality, and reduces the dispersion of the defocus curve.

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

[0085] In some embodiments of the present invention, the inner diameter d7s of the side of the seventh spacer element and the thickness CT7 of the seventh lens on the optical axis satisfy the following condition: 5.11≤d7s / CT7≤7.52; this can reduce the radial pressure on the seventh lens, improve the stability of the seventh lens, improve the lens deformation problem that may be caused by assembly, and thus ensure the reliability of the lens optical structure.

[0086] In some embodiments of the present invention, the plurality of spacers further include an eighth spacer located between the image-side surface and the image plane of the eighth lens, and at least partially abutting the image-side surface of the eighth lens; the thickness CT8 of the eighth lens on the optical axis, the air gap T78 between the seventh and eighth lenses on the optical axis, and the distance EP78 from the image-side surface of the seventh spacer to the object-side surface of the eighth spacer along the optical axis satisfy: 0.88≤(CT8+T78) / EP78≤1.56; this can optimize the propagation path of light in the seventh lens, the eighth lens, and their spacer regions, so that the light can be focused more accurately on the imaging surface, thereby improving the clarity and resolution of the image; at the same time, it can also ensure that the pressure distribution of the seventh and eighth lenses is balanced, making the assembly process stable.

[0087] In some embodiments of the present invention, the effective focal length f3 of the third lens satisfies the following relationship with the outer diameter D2m of the image side of the second spacer element and the inner diameter d2m of the image side of the second spacer element: -3.85≤f3 / (D2m-d2m)≤-1.66; by controlling the difference between the inner and outer diameters of the object side of the second spacer element, it is helpful to intercept excess stray light, and at the same time limit the effective focal length of the third lens, which is beneficial to ensure the stable transmission of light.

[0088] In some embodiments of the present invention, the inner diameter d0s of the object-side end face of the lens barrel and the distance EP01 between the object-side end face of the lens barrel and the object-side surface of the first spacer in the direction along the optical axis satisfy the following condition: 5.08≤d0s / EP01≤6.49. By controlling this condition, the inner diameter of the object-side end face of the lens barrel can be constrained, which is beneficial to reasonably control the incident aperture size of the light, and at the same time can effectively control the light transmission of the optical imaging lens, which helps to balance the incident angle and diameter of the light.

[0089] In some embodiments of the present invention, the inner diameter d1m of the image side of the first spacer element and the distance EP12 from the image side of the first spacer element to the object side of the second spacer element along the optical axis satisfy the following condition: 7.39≤d1m / EP12≤9.30. This is beneficial for reducing the incident angle of light between the first and second lenses, reducing the probability of total internal 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 this application can employ multiple lenses, such as the eight lenses mentioned above. By rationally allocating the optical power, surface shape, and arrangement of the spacers of each lens, the range of each lens-lens connection is made more uniform, enhancing the light-gathering ability and improving the imaging quality of the optical imaging lens.

[0091] In some embodiments of the present invention, the lens material in the optical imaging lens provided by the present invention can be glass or plastic. When the lens material is plastic, production costs can be effectively reduced. When the lens material is glass, the low dispersion characteristic of glass itself can effectively correct the geometric chromatic aberration of the optical imaging lens. The optical imaging lens provided by the present invention can adopt an all-plastic lens structure, which not only gives the lens excellent imaging performance but also allows for a more compact lens structure, achieving a good balance between lens miniaturization and high image quality.

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

[0093] When an aspherical lens is used, the surface shape of each aspherical lens in the optical imaging lens can be defined using, but is not limited to, the following aspherical formula:

[0094]

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

[0096] The present invention will be further described below with reference to several embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical imaging lens are different; for specific differences, please refer to the parameter tables of each embodiment. The following embodiments are merely preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following embodiments. Any changes, substitutions, combinations, or simplifications made without departing from the innovative points of the present invention should be considered as equivalent substitutions and are included within the protection scope of the present invention.

[0097] Example 1

[0098] The following is for reference Figures 2A to 2G An optical imaging lens according to Embodiment 1 of this application is described. Figure 2A , Figure 2B and Figure 2C The following are schematic diagrams showing the structures of optical imaging lens 1001, optical imaging lens 1002 and optical imaging lens 1003 according to Embodiment 1 of this application.

[0099] like Figure 2A , Figure 2B and Figure 2C 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.

[0100] Figure 2A This is a schematic diagram of the optical imaging lens 1001. In this embodiment, the object-side surface S1 of the first lens is in contact with the lens barrel portion; the object-side surface and image-side surface of the first spacer element P1 are in partial contact with 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 image-side surface of the second spacer element P2 are in partial contact with 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 image-side surface of the third spacer element P3 are in partial contact with 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 image-side surface of the fourth spacer element P4 are in partial contact with the image-side surface of the fourth lens. S8 is in contact with the object side surface S9 of the fifth lens; the object side surface and image side surface of the fifth spacer element P5 are in contact with 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 image side surface of the sixth spacer element P6 are in contact with 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 image side surface of the seventh spacer element P7 are in contact with the image side surface S14 of the seventh lens and the object side surface S15 of the eighth lens, respectively; the object side surface of the eighth spacer element P8 is in contact with the image side surface S16 of the eighth lens.

[0101] Figure 2BThis is a schematic diagram of the optical imaging lens 1002. The difference from the optical imaging lens 1001 is that a fourth auxiliary spacer element P4b is also provided on the image side of the fourth lens E4. In this case, the image side of the fourth spacer element P4b is in 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 contact with the object side S9 of the fifth lens. The contact method of the remaining spacers is the same as that of the optical imaging lens 1001, and can be referred to the relevant description in the optical imaging lens 1001; it will not be repeated here.

[0102] Figure 2C This is a schematic diagram of the structure of the optical imaging lens 1003; the bearing and contact method of each spacer element is the same as that of the optical imaging lens 1002, and can be referred to the relevant description in the optical imaging lens 1002, which will not be repeated here.

[0103] In summary, the structural parameters of optical imaging lens 1001, optical imaging lens 1002, and optical imaging lens 1003 in Embodiment 1 are shown in Table 9.

[0104] In Embodiment 1, the schematic diagrams of optical imaging lenses 1001, 1002, and 1003 all employ the same imaging lens group. Specifically, the first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has negative optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being convex. The eighth lens E8 has negative optical power. Its object-side surface S15 is concave, and its image-side surface S16 is concave. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged on the imaging surface S19. S17 and S18 can be the object-side and image-side surfaces of filters or protective glass, respectively, and S19 is the imaging surface (S17, S18, S19 are as follows). Figure 2A As shown in the figure (other figures omitted), OBJ (not shown in the figure) is the object distance, and STO (not shown in the figure) is the aperture stop, which is set in front of the first lens E1.

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

[0106] OBJ spherical endless endless STO spherical endless -0.3850 S1 aspherical 2.8543 0.4612 1.54 50.58 0.0000 S2 aspherical 2.6995 0.1082 0.0000 S3 aspherical 2.4350 0.5495 1.62 60.57 0.0000 S4 aspherical 8.2233 0.1000 0.0000 S5 aspherical 11.6961 0.3600 1.76 27.58 0.0000 S6 aspherical 3.9042 0.3555 0.0000 S7 aspherical 11.2990 0.7724 1.64 57.06 0.0000 S8 aspherical -6.8693 0.1000 0.0000 S9 aspherical 11.8062 0.3600 1.70 30.17 0.0000 S10 aspherical 4.7353 0.4526 0.0000 S11 aspherical 26.2769 0.7039 1.57 43.61 0.0000 S12 aspherical 5.1413 0.1000 0.0000 S13 aspherical 3.2964 1.1733 1.68 51.20 0.0000 S14 aspherical -13.4404 0.7545 0.0000 S15 aspherical -7.9352 0.3600 1.52 54.95 0.0000 S16 aspherical 3.1962 0.4492 -1.0000 S17 spherical 0.2100 1.52 64.17 S18 spherical 0.4900 S19 spherical 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] 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 number <![CDATA[A 18 ]]> <![CDATA[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] Figure 2D 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 2E 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 2F 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 2G 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... Figures 2D to 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 3A to 3G An optical imaging lens according to Embodiment 2 of this application is described. Figure 3A , Figure 3B and Figure 3C 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 3A , Figure 3B and Figure 3C 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 3A This is a schematic diagram of the optical imaging lens 2001. In this embodiment, the object-side surface S1 of the first lens is in contact with the lens barrel portion; the object-side surface and image-side surface of the first spacer element P1 are in partial contact with 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 image-side surface of the second spacer element P2 are in partial contact with 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 image-side surface of the third spacer element P3 are in partial contact with 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 image-side surface of the fourth spacer element P4 are in partial contact with the image-side surface of the fourth lens. S8 is in contact with the object side surface S9 of the fifth lens; the object side surface and image side surface of the fifth spacer element P5 are in contact with 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 image side surface of the sixth spacer element P6 are in contact with 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 image side surface of the seventh spacer element P7 are in contact with the image side surface S14 of the seventh lens and the object side surface S15 of the eighth lens, respectively; the object side surface of the eighth spacer element P8 is in contact with the image side surface S16 of the eighth lens.

[0116] Figure 3B This is a schematic diagram of the optical imaging lens 2002. The difference from the optical imaging lens 2001 is that a fourth auxiliary spacer element P4b is also provided on the image side of the fourth lens E4. In this case, the image side of the fourth spacer element P4 is in 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 contact with the object side S9 of the fifth lens. The contact method of the remaining spacers is the same as that of the optical imaging lens 2001, and can be referred to the relevant description in the optical imaging lens 2001, which will not be repeated here.

[0117] Figure 3C This is a schematic diagram of the structure of the optical imaging lens 2003; the bearing and contact method of each spacer element is the same as that of the optical imaging lens 2002, and can be referred to the relevant description in the optical imaging lens 2002, which will not be repeated here.

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

[0119] In Embodiment 2, the schematic diagrams of optical imaging lenses 2001, 2002, and 2003 all employ the same imaging lens group. The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being concave. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being convex. The eighth lens E8 has negative optical power, with its object-side surface S15 being concave and its image-side surface S16 being concave. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged onto the imaging surface S19. Here, S17 and S18 (not shown in the figure) can be the object-side and image-side surfaces of filters 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 aperture stop, which is positioned in front of the first lens E1.

[0120] Table 4 lists the relevant parameters of each lens in the optical imaging lens of this embodiment. The units for radius of curvature and thickness are millimeters (mm).

[0121]

[0122]

[0123] Table 4

[0124] Table 5 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.

[0125]

[0126]

[0127] Table 5

[0128] Figure 3D The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 2 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 3EThe astigmatism curve of the optical imaging lens of Embodiment 2 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 3F The distortion curve of the optical imaging lens of Embodiment 2 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 3G The magnification chromatic aberration curve of the optical imaging lens of Embodiment 2 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to... Figures 3D to 3G It can be seen that the optical imaging lens given in Example 2 can achieve good imaging quality.

[0129] Example 3

[0130] The following is for reference Figures 4A to 4G An optical imaging lens according to Embodiment 3 of this application is described. Figure 4A , Figure 4B and Figure 4C Schematic diagrams of the optical imaging lens 3001, optical imaging lens 3002 and optical imaging lens 3003 according to Embodiment 3 of this application are shown respectively.

[0131] like Figure 4A , Figure 4B and Figure 4C 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 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 4AThis is a schematic diagram of the optical imaging lens 3001. In this embodiment, the object-side surface S1 of the first lens is in contact with the lens barrel portion; the object-side surface and image-side surface of the first spacer element P1 are in partial contact with 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 image-side surface of the second spacer element P2 are in partial contact with 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 image-side surface of the third spacer element P3 are in partial contact with 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 image-side surface of the fourth spacer element P4 are in partial contact with the image-side surface S8 of the fourth lens and the object-side surface of the fourth auxiliary spacer element P4b, respectively. Partial contact occurs when the image-side surface of the fourth auxiliary spacer element P4b partially contacts the object-side surface S9 of the fifth lens; the object-side surface and 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 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 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.

[0133] Figure 4B This is a schematic diagram of the structure of the optical imaging lens 3002; the bearing and contact method of each spacer element is the same as that of the optical imaging lens 3001, and can be referred to the relevant description in the optical imaging lens 3001, which will not be repeated here.

[0134] Figure 4C This is a schematic diagram of the structure of the optical imaging lens 3003; the bearing and contact method of each spacer element is the same as that of the optical imaging lens 3001, and can be referred to the relevant description in the optical imaging lens 3001, which will not be repeated here.

[0135] In summary, the structural parameters of optical imaging lenses 3001, 3002, and 3003 in Embodiment 3 are shown in Table 9.

[0136] In Embodiment 3, the schematic diagrams of optical imaging lenses 3001, 3002, and 3003 employ the same imaging lens group. The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has negative optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being convex. The eighth lens E8 has negative optical power, with its object-side surface S15 being convex and its image-side surface S16 being concave. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged onto the imaging surface S19. S17 and S18 (not shown in the figure) can be the object-side and image-side surfaces of filters 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 aperture stop, which is positioned in front of the first lens E1.

[0137] Table 6 lists the relevant parameters of each lens in the optical imaging lens of this embodiment, where the units for radius of curvature and thickness are millimeters (mm).

[0138] OBJ spherical endless endless STO spherical endless 0.1000 S1 aspherical 2.7998 0.4636 1.55 56.72 -1.0000 S2 aspherical 2.6174 0.1383 0.0000 S3 aspherical 2.3550 0.6083 1.63 58.93 0.0000 S4 aspherical 11.2292 0.1000 0.0000 S5 aspherical 11.8691 0.2800 1.76 27.58 0.0000 S6 aspherical 3.3393 0.4400 0.0000 S7 aspherical 11.1105 1.0169 1.66 54.08 0.0000 S8 aspherical -6.1786 0.1000 0.0000 S9 aspherical 9.0576 0.2800 1.76 27.58 0.0000 S10 aspherical 4.2836 0.5254 0.0000 S11 aspherical 42.7163 0.4569 1.75 38.47 0.0000 S12 aspherical 5.6694 0.1000 0.0000 S13 aspherical 2.9183 0.7703 1.74 44.85 -1.0000 S14 aspherical -10.3156 0.4939 -1.0000 S15 aspherical 4.9686 0.4093 1.69 40.39 0.0000 S16 aspherical 1.6939 0.5491 -1.0000 S17 spherical 0.2100 1.52 64.17 S18 spherical 0.4900 S19 spherical 0.0000

[0139] Table 6

[0140] Table 7 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.

[0141]

[0142]

[0143] Table 7

[0144] Figure 4D The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 3 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 4E The astigmatism curve of the optical imaging lens of Embodiment 3 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 4F The distortion curve of the optical imaging lens of Embodiment 3 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 4G The magnification chromatic aberration curve of the optical imaging lens of Embodiment 3 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to... Figures 4D to 4G It can be seen that the optical imaging lens given in Example 3 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 Examples 1 to 3 are shown in Table 8 below.

[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 Examples 1 to 3 are shown in Table 9 below, in millimeters (mm).

[0150] d1m 3.0185 3.0185 3.1185 3.3210 3.3210 3.4210 3.2177 3.2177 3.3177 D1m 5.0314 5.9300 6.0300 6.1858 7.1563 7.2563 5.2338 6.2065 6.3065 d2s 2.9630 2.9630 3.0630 3.2486 3.2486 3.3486 3.2097 3.2097 3.3097 d2m 2.9630 2.9630 3.0630 3.2486 3.2486 3.3486 3.2097 3.2097 3.3097 D2m 5.0217 6.1945 6.2945 6.1661 7.4838 7.5838 5.2258 6.5339 6.6339 D3m 5.2283 6.6348 6.7348 6.3785 7.6879 7.7879 5.4208 6.8388 6.9388 d4m 3.5879 4.9982 5.0982 3.9853 6.0580 6.1580 5.4331 5.4351 5.5331 D4m 6.9462 6.7877 6.8877 6.5821 7.8475 7.9311 7.2225 7.2825 7.3225 D5s 7.1871 7.3122 7.4122 8.0324 8.1995 8.2995 7.8307 7.8357 7.9307 d5s 4.0108 4.0321 4.1321 4.3766 4.4527 4.5527 4.3277 4.3217 4.4277 d6s 4.7250 4.7355 4.8355 4.8460 4.9148 5.0148 4.8519 4.8569 4.9519 d7s 5.9940 6.0226 6.1226 6.1580 6.1161 6.2161 5.6927 5.6927 5.7927 d0s 6.1090 6.0022 6.1022 7.2629 6.8311 6.9311 6.3130 6.3130 6.4130 EP01 1.1498 1.1823 1.1323 1.1190 1.1303 1.1503 1.2025 1.1626 1.2126 EP12 0.3936 0.3880 0.3880 0.4421 0.4391 0.4391 0.3459 0.4356 0.3785 EP34 0.9234 0.6693 0.6204 1.1047 0.8890 0.7582 0.9032 0.8586 0.8086 EP45 0.7908 0.7317 0.7719 0.8887 0.7711 0.7961 0.7328 0.7775 0.7947 EP56 0.6983 0.7249 0.6847 0.3813 0.4101 0.4560 0.4697 0.4885 0.4557 EP67 1.1904 1.1491 1.2019 1.0872 1.0518 1.0059 0.8368 0.8181 0.8835 EP78 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 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 Examples 1 to 3 satisfy the relationship shown in Table 10.

[0153]

[0154]

[0155] Table 10

[0156] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An optical imaging lens, comprising a lens barrel and an imaging lens group and a plurality of spacer elements housed within the lens barrel, characterized in that, The imaging lens group includes, in sequence along the optical axis from the object side to the image side: a first lens with optical power, a second lens with positive optical power, a third lens with negative optical power, a fourth lens with positive optical power, a fifth lens with negative optical power, a sixth lens with negative optical power, a seventh lens with positive optical power, and an eighth lens with negative optical power, for a total of eight lenses with optical power, and air gaps between adjacent lenses. The first lens has a convex object-side surface and a concave image-side surface; the second lens has a convex object-side surface and a concave image-side surface; the third lens has a convex object-side surface and a concave image-side surface; the fourth lens has a convex object-side surface and a convex image-side surface; the fifth lens has a convex object-side surface and a concave image-side surface; the sixth lens has a concave image-side surface; the seventh lens has a convex object-side surface and a convex image-side surface; and the eighth lens has a concave image-side surface. The plurality of spacers include a first spacer located between the first lens and the second lens and at least partially abutting the image side of the first lens; and a second spacer located between the second lens and the third lens and at least partially abutting the image side of the second lens. The optical imaging lens satisfies: 10.30≤L / (CT2+T12)≤11.69, 11.34≤f12 / EP12≤14.77; 0.83≤(D1m-d1m) / R3≤1.56, 2.68≤R4 / d2s≤3.50; 7.39≤d1m / EP12≤9.30; where 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 of the first spacer element to the object side of the second spacer element along the optical axis, R3 is the radius of curvature of the object side of the second lens, D1m is the outer diameter of the image side of the first spacer element, d1m is the inner diameter of the image side of the first spacer element, R4 is the radius of curvature of the image side of the second lens, and d2s is the inner diameter of the object side of the second spacer element. 2.The optical imaging lens according to claim 1, wherein, The plurality of spacers also includes a third spacer located between the third lens and the fourth lens, and at least partially abutting the image side 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 of the fourth lens, and D3m is the outer diameter of the image side of the third spacer element. 3.The optical imaging lens according to claim 2, wherein, The plurality of spacers also includes a fourth spacer located between the fourth lens and the fifth lens, and at least partially abutting the image side 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 of the third spacer element to the object side 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 the following condition: 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 spacers also includes a fifth spacer located between the fifth lens and the sixth lens, and at least partially abutting the image side 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 of the fifth spacer element, D4m is the outer diameter of the image side of the fourth spacer element, and EP45 is the distance along the optical axis from the image side of the fourth spacer element to the object side of the fifth spacer element.

6. The optical imaging lens according to claim 5, characterized in that, The optical imaging lens satisfies: 4.59≤d5s / (CT5+T56)≤5.5; Wherein, d5s is the inner diameter of the object side of the fifth spacer element, CT5 is the thickness of the fifth lens on the optical axis, and T56 is the air gap between the fifth lens and the sixth lens on the optical axis.

7. The optical imaging lens according to claim 5, characterized in that, The plurality of spacers also includes a sixth spacer located between the sixth lens and the seventh lens and at least partially abutting the image side of the sixth lens; and a seventh spacer located between the seventh lens and the eighth lens and at least partially abutting the image side of the seventh lens. The optical imaging lens satisfies: 1.59≤EP67 / EP56≤2.85; Wherein, EP56 is the distance along the optical axis from the image side of the fifth spacer element to the object side of the sixth spacer element, and EP67 is the distance along the optical axis from the image side of the sixth spacer element to the object side of the seventh spacer element.

8. The optical imaging lens according to claim 7, characterized in that, The optical imaging lens satisfies: 3.34≤f7 / EP67≤4.02; Where f7 is the effective focal length of the seventh lens, and EP67 is the distance along the optical axis from the image side of the sixth spacer to the object side of the seventh spacer.

9. The optical imaging lens according to claim 7, characterized in that, The optical imaging lens satisfies: -2.41≤f6 / d6s≤-1.78; Where f6 is the effective focal length of the sixth lens, and 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 optical imaging lens satisfies: 5.11≤d7s / CT7≤7.52; Wherein, d7s is the inner diameter of the object side of the seventh spacer element, and CT7 is the thickness of the seventh lens on the optical axis.

11. The optical imaging lens according to claim 7, characterized in that, The plurality of spacers also includes an eighth spacer located between the eighth lens and the image plane, and at least partially abutting the image side 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 between the seventh lens and the eighth lens on the optical axis, and EP78 is the distance along the optical axis from the image side of the seventh spacer element to the object side of the eighth spacer element.

12. The optical imaging lens according to any one of claims 1-11, characterized in that, The optical imaging lens satisfies: -3.85≤f3 / (D2m-d2m)≤-1.66; Where 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.

13. The optical imaging lens according to any one of claims 1-11, characterized in that, The optical imaging lens satisfies: 5.08≤d0s / EP01≤6.49; Wherein, d0s is the inner diameter of the object-side end face of the lens barrel, and EP01 is the distance between the object-side end face of the lens barrel and the object-side surface of the first spacer element along the optical axis.

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