Optical imaging lens

Abstract

The present application relates to a kind of optical imaging lens, including lens barrel and the imaging lens group and multiple spacer elements placed in lens barrel, the imaging lens group is sequentially included from object side to image side along optical axis: the first lens with optical power, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens;Multiple spacer elements include second spacer element between the second lens and the third lens, and directly contact with the image side surface of the second lens;The optical imaging lens satisfies: 3.22≤D2s / R3≤5.31 and 2.59≤d2s / R4≤3.83;Wherein, R3 is the curvature radius of the object side surface of the second lens, R4 is the curvature radius of the image side surface of the second lens, D2s is the outer diameter of the object side surface of the second spacer element, and d2s is the inner diameter of the object side surface of the second spacer element.The optical imaging lens of the present application has at least one of the technical advantages of high resolution, large field of view, etc., and has strong market competitiveness.

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 recent years, drones have been widely used in agricultural plant protection, topographic mapping, and security inspection due to their flexibility and efficiency. In agriculture, drones need to fly precisely in complex field environments, avoiding obstacles such as crops and trees; in topographic mapping, data collection is required in complex terrains such as mountains and valleys, placing extremely high demands on flight safety; during security inspections, drones must navigate through urban buildings and power facilities, promptly avoiding sudden obstacles. Therefore, reliable autonomous obstacle avoidance capabilities have become a key technological requirement for drones to achieve intelligent operations.

[0003] Currently, drone obstacle avoidance technology mainly relies on LiDAR, infrared sensors, ultrasonic sensors, and traditional cameras. While LiDAR can provide high-precision 3D environmental information, it is expensive, with a single unit costing anywhere from several thousand to tens of thousands of yuan. Furthermore, it is bulky, heavy, and consumes a lot of power, making it unsuitable for small and medium-sized drones. Infrared and ultrasonic sensors have short effective detection ranges, typically less than 10 meters, and are easily affected by factors such as ambient light and obstacle materials. For example, they are prone to missing detections when encountering transparent objects, making them only suitable for short-range obstacle avoidance. Traditional cameras have limited field of view, generally less than 120°. To achieve omnidirectional environmental perception, multiple cameras need to be stitched together, which not only increases hardware complexity but also significantly increases data processing costs and system power consumption.

[0004] To address the aforementioned issues, existing lenses typically require a larger field of view. However, in the pursuit of a larger field of view, there are still shortcomings in the imaging quality and resolution of optical imaging lenses. Summary of the Invention

[0005] To address the problems existing in the prior art, the present invention aims to provide an optical imaging lens that has at least one of the technical advantages of high resolution and wide field of view.

[0006] 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 disposed within the lens barrel;

[0007] 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.

[0008] The plurality of spacer elements includes a second spacer element located between the second lens and the third lens and in direct contact with the image side of the second lens;

[0009] The optical imaging lens satisfies: 3.22≤D²s / R³≤5.31 and 2.59≤d²s / R₄≤3.83;

[0010] Wherein, R3 is the radius of curvature of the object side of the second lens, R4 is the radius of curvature of the image side of the second lens, D2s is the outer diameter of the object side of the second spacer element, and d2s is the inner diameter of the object side of the second spacer element.

[0011] According to one technical solution of the present invention, the spacer element further includes a third spacer element located between the third lens and the fourth lens and in direct contact with the image side surface of the third lens;

[0012] The optical imaging lens satisfies: 1.99≤(EP23+CT3) / SAG31≤3.04;

[0013] Wherein, the interval between the second spacer element and the third spacer element, SAG31 is the axial displacement between the intersection of the object side surface of the third lens and the optical axis and the effective radius vertex of the optical region of the object side surface of the third lens, and CT3 is the center thickness of the third lens on the optical axis.

[0014] According to one technical solution of the present invention, the optical imaging lens satisfies: 1.17≤R6 / (D3s-d3s)≤2.03;

[0015] Wherein, R6 is the radius of curvature of the image side of the third lens, D3s is the outer diameter of the object side of the third spacer element, and d3s is the inner diameter of the object side of the third spacer element.

[0016] According to one technical solution of the present invention, the optical imaging lens satisfies: -7.39≤R7 / d3m≤-2.8;

[0017] Wherein, R7 is the radius of curvature of the object side of the fourth lens, and d3m is the inner diameter of the image side of the third spacer element.

[0018] According to one technical solution of the present invention, the spacer element further includes a fifth spacer element located between the fifth lens and the sixth lens and in direct contact with the image side surface of the fifth lens;

[0019] The optical imaging lens satisfies: 1.53≤R9 / d5s≤2.11;

[0020] Wherein, R9 is the radius of curvature of the object-side surface of the fifth lens, and d5s is the inner diameter of the object-side surface of the fifth spacer element.

[0021] According to one technical solution of the present invention, the optical imaging lens satisfies: -1.67≤(D5m-d5m) / R11≤-0.32;

[0022] Wherein, R11 is the radius of curvature of the object side of the sixth lens, D5m is the outer diameter of the image side of the fifth spacer element, and d5m is the inner diameter of the image side of the fifth spacer element.

[0023] According to one technical solution of the present invention, the spacer element further includes a sixth spacer element located between the sixth lens and the seventh lens and in direct contact with the image side surface of the sixth lens;

[0024] The optical imaging lens satisfies: 1.3≤d6m / R13≤2.06;

[0025] Wherein, d6m is the inner diameter of the image side of the sixth spacer element, and R13 is the radius of curvature of the object side of the seventh lens.

[0026] According to one technical solution of the present invention, the optical imaging lens satisfies: 2.3≤EP56 / CT6≤3.1;

[0027] Wherein, EP56 is the spacing between the fifth spacer element and the sixth spacer element, and CT6 is the center thickness of the sixth lens on the optical axis.

[0028] According to one embodiment of the present invention, the spacer element further includes a fourth spacer element located between the fourth lens and the fifth lens and in direct contact with the image-side surface of the fourth lens; or

[0029] The inner ring surface of the lens barrel is provided with a first protrusion located between the fourth lens and the fifth lens, and in direct contact with the image side surface of the fourth lens.

[0030] According to one embodiment of the present invention, the spacer element further includes a seventh spacer element located between the seventh lens and the eighth lens and in direct contact with the image-side surface of the seventh lens; or

[0031] The inner ring surface of the lens barrel is provided with a second protrusion located between the seventh lens and the eighth lens, and in direct contact with the image side surface of the seventh lens.

[0032] According to one technical solution of the present invention, the optical imaging lens satisfies: 5.11≤TAN(Semi-FOV)*d0s / f1≤5.89;

[0033] Wherein, Semi-FOV is half of the maximum field of view of the camera lens, f1 is the effective focal length of the first lens, and d0s is the inner diameter of the front end face of the lens barrel closest to the object side.

[0034] According to one technical solution of the present invention, it further includes a locking ring, wherein the object-side end of the locking ring abuts against the edge of the object-side surface of the first lens;

[0035] The optical imaging lens satisfies: 1.8≤CT1 / (SAG12-SAG11)≤2.89;

[0036] Wherein, CT1 is the center thickness of the first lens on the optical axis, SAG11 is the axial displacement between the intersection of the object side surface of the first lens and the optical axis and the vertex of the effective radius of the optical region of the object side surface of the first lens, and SAG12 is the axial displacement between the intersection of the image side surface of the first lens and the optical axis and the vertex of the effective radius of the optical region of the image side surface of the first lens.

[0037] According to one technical solution of the present invention, the optical imaging lens satisfies: 1.33≤CT2 / (SAG22-SAG21)≤2.04;

[0038] Wherein, CT2 is the center thickness of the second lens on the optical axis, SAG21 is the axial displacement between the intersection of the object side surface of the second lens and the optical axis and the vertex of the effective radius of the optical region of the object side surface of the second lens, and SAG22 is the axial displacement between the intersection of the image side surface of the second lens and the optical axis and the vertex of the effective radius of the optical region of the image side surface of the second lens.

[0039] According to one technical solution of the present invention, the optical imaging lens satisfies: -4.27≤f2 / EP02≤-2.55;

[0040] Where f2 is the effective focal length of the second lens, and EP02 is the spacing between the front end face of the lens barrel and the second spacer element.

[0041] According to one technical solution of the present invention, the optical imaging lens satisfies: 1.03≤R5 / d2m≤1.69;

[0042] Wherein, R5 is the radius of curvature of the object side of the third lens, and d2m is the inner diameter of the image side of the second spacer element.

[0043] According to one technical solution of the present invention, the optical imaging lens satisfies: 20.28≤(CT4+CT5) / (T45+T56)≤31.22;

[0044] Wherein, CT4 is the center thickness of the fourth lens on the optical axis, CT5 is the center thickness of the fifth lens on the optical axis, T45 is the air gap between the fourth lens and 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.

[0045] The beneficial effects of this invention are:

[0046] The optical imaging lens of this application uses eight lenses with optical power and at least one spacer element. The first to eighth lenses are arranged in sequence with intervals. In order to achieve a larger field of view, the aperture of the first lens located on the object side needs to be increased. This results in a height difference between the outer diameter of the first lens and the outer diameter of the second lens in the direction perpendicular to the optical axis, which makes the structural area of ​​the second lens more prone to internal reflection stray light. When the relationship "3.22≤D2s / R3≤5.312.59≤d2s / R4≤3.83" is satisfied, by controlling the ratio of the radius of curvature of the object side of the second lens to the outer diameter of the object side of the second spacer element, and the radius of curvature of the image side of the second lens to the inner diameter of the object side of the second spacer element, it is possible to achieve a larger field of view and obstacle avoidance performance of the optical imaging lens while reducing stray light intensity and ensuring image quality. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the 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 creative effort.

[0048] Figure 1A A structural layout diagram and schematic diagram of some parameters of an optical imaging lens according to the present invention are shown;

[0049] Figure 1B , Figure 1C and Figure 1D Schematic diagrams showing partial parameters of a first lens, a second lens, and a third lens of an optical imaging lens according to the present invention are shown respectively;

[0050] Figure 2A , Figure 2B A schematic diagram of the structure of two optical imaging lenses according to Embodiment 1 of this application is shown;

[0051] Figure 2C , Figure 2D and Figure 2E The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging lens according to Embodiment 1 of this application are shown respectively.

[0052] Figure 3A , Figure 3B The diagram shows two optical imaging lenses according to Embodiment 2 of this application;

[0053] Figure 3C , Figure 3D and Figure 3E The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging lens according to Embodiment 2 of this application are shown respectively.

[0054] Figure 4A , Figure 4B The diagram shows two optical imaging lenses according to Embodiment 3 of this application;

[0055] Figure 4C , Figure 4D and Figure 4E The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging lens according to Embodiment 3 of this application are shown respectively.

[0056] Figure 5A , Figure 5B The diagram shows two optical imaging lenses according to Embodiment 4 of this application;

[0057] Figure 5C , Figure 5D and Figure 5E The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging lens according to Embodiment 4 of this application are shown respectively.

[0058] Figure 6A Two preferred configurations of the fourth and fifth lenses of this application are shown;

[0059] Figure 6B Two preferred configurations of the seventh and eighth lenses of this application are shown;

[0060] Figure 7 A typical light spot simulation diagram of an optical lens is shown;

[0061] Figure 8 A typical light spot simulation diagram of an optical imaging lens according to one embodiment of the present invention is shown;

[0062] Figure 9 A simulation diagram of a typical light spot of another optical lens is shown. Detailed Implementation

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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 imaging 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.

[0067] In the text, each lens has an optical region and a structural region on its object side or image side. The optical region refers to the area through which light passes, and the structural region refers to the area used for assembly.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] like Figures 1A to 1D As shown, the optical 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 the others and there is an air gap between each lens on the optical axis.

[0072] The plurality of spacer elements includes a second spacer element, a third spacer element, a fifth spacer element, and a sixth spacer element. The second spacer element is located between the second lens and the third lens and is in direct contact with the image-side surface of the second lens. The third spacer element is located between the third lens and the fourth lens and is in direct contact with the image-side surface of the third lens. The fifth spacer element is located between the fifth lens and the sixth lens and is in direct contact with the image-side surface of the fifth lens. The sixth spacer element is located between the sixth lens and the seventh lens and is in direct contact with the image-side surface of the sixth lens. Direct contact means at least partial contact.

[0073] 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.

[0074] 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.

[0075] The first aspect of this application provides an optical imaging lens, including an optical lens group. The optical lens group may include 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. A second spacer element is disposed between the second lens and the third lens. The optical imaging lens satisfies: 3.22≤D2s / R3≤5.31 and 2.59≤d2s / R4≤3.83; where R3 is the radius of curvature of the object side surface of the second lens, R4 is the radius of curvature of the image side surface of the second lens, D2s is the outer diameter of the object side surface of the second spacer element, and d2s is the inner diameter of the object side surface of the second spacer element.

[0076] To achieve wider environmental perception and obstacle avoidance performance, optical imaging lenses typically feature a lens with the largest aperture near the object side, gradually decreasing in outer diameter thereafter. Simultaneously, due to optical system design requirements, the second lens has a larger curvature on both the object and image sides, and a larger aperture on the object side. This creates a significant height difference between the outer diameters of the first and second lenses perpendicular to the optical axis, making the second lens's structural area more prone to internal reflection stray light. Therefore, it is necessary to rationally set the curvature of the object and image sides of the second lens, as well as the inner diameter of the second spacer element, to minimize stray light risk during the design phase. When 3.22≤D²s / R³≤5.31 and 2.59≤d²s / R₄≤3.83 are satisfied, the optical imaging lens of this application can meet the requirements of an obstacle avoidance fisheye lens, while reducing stray light intensity and achieving high imaging quality.

[0077] When D2s / R3 = 3.1 and d2s / R4 = 2.4, the simulation graph is as follows. Figure 7 As shown; when D2s / R3 = 4.1 and d2s / R4 = 2.8, the simulation graph is as follows. Figure 8 As shown; when D2s / R3 = 5.5 and d2s / R4 = 4.0, the simulation graph is as follows. Figure 9 As shown, when the above range is met, the stray light intensity is low; when the above range is not met, the stray light intensity is high and the risk is greater.

[0078] In some embodiments of the present invention, the optical imaging lens satisfies: 1.99≤(EP23+CT3) / SAG31≤3.04; where EP23 is the spacing between the second and third spacers, SAG31 is the axial displacement between the intersection of the object-side surface of the third lens and the optical axis and the effective radius vertex of the optical region of the object-side surface of the third lens, and CT3 is the center thickness of the third lens on the optical axis.

[0079] When the above conditions are met, the thickness, edge thickness, and object-side sagitta of the third lens can be effectively and reasonably controlled to ensure that the thickness ratio and object-side sagitta of the third lens are in balance, which is beneficial to the molding of the third lens. The reasonable setting of the thickness ratio helps to avoid the risk of weld lines, and the reasonable setting of the object-side sagitta reduces the demolding force, ensuring the stability of demolding, which is beneficial to the stability of the lens demolding surface data and indirectly improves the lens yield.

[0080] In some embodiments of the present invention, the optical imaging lens satisfies: 1.17≤R6 / (D3s-d3s)≤2.03; where R6 is the radius of curvature of the image side of the third lens, D3s is the outer diameter of the object side of the third spacer element, and d3s is the inner diameter of the object side of the third spacer element.

[0081] When the above conditions are met, the inner diameter of the third spacer element can be directly controlled. At the same time, by matching the appropriate radius of curvature of the image side of the third lens, stray light rays reflected from inside the third lens and emitted towards the image surface can be effectively blocked, which helps to improve the overall stray light performance of the lens.

[0082] In some embodiments of the present invention, the optical imaging lens satisfies: -7.39≤R7 / d3m≤-2.8; where R7 is the radius of curvature of the object side of the fourth lens, and d3m is the inner diameter of the image side of the third spacer element.

[0083] When the above conditions are met, the inner diameter of the third spacer element is effectively guaranteed, which helps to block light entering the fourth lens at a large angle and improves the overall imaging level of the lens.

[0084] In some embodiments of the present invention, the optical imaging lens satisfies: 1.53≤R9 / d5s≤2.11; where R9 is the radius of curvature of the object-side surface of the fifth lens, and d5s is the inner diameter of the object-side surface of the fifth spacer element.

[0085] When the above conditions are met, the inner diameter of the fifth spacer element can be effectively guaranteed, which helps to block stray light rays that are reflected inside the fifth lens and emitted towards the image plane, thus improving the overall stray light performance of the lens.

[0086] In some embodiments of the present invention, the optical imaging lens satisfies: 1.3≤d6m / R13≤2.06; where d6m is the inner diameter of the image side of the sixth spacer element and R13 is the radius of curvature of the object side of the seventh lens.

[0087] When the above conditions are met, the inner diameter of the third spacer element is effectively guaranteed, which helps to intercept and reduce the formation of stray light from invalid light rays entering the seventh lens, and helps to improve the overall stray light performance of the lens.

[0088] In some embodiments of the present invention, the optical imaging lens satisfies: 2.3≤EP56 / CT6≤3.1; where EP56 is the spacing between the fifth spacer element and the sixth spacer element, and CT6 is the center thickness of the sixth lens on the optical axis.

[0089] When the above conditions are met, the dimensions of the edge thickness and the middle thickness of the sixth lens can be reasonably controlled directly. Since the sixth lens is a biconcave high-refractive-index lens, the risk of weld lines after molding is relatively high. However, when 2.3≤EP56 / CT6≤3.1 is met, the thickness ratio of the lens can be directly controlled to minimize the risk of weld lines in the sixth lens.

[0090] In some embodiments of the present invention, such as Figure 6A and Figure 6B As shown, the spacer element also includes a fourth spacer element P4 located between the fourth lens and the fifth lens and in direct contact with the image-side surface of the fourth lens; or

[0091] A first protrusion P01 is provided on the inner ring surface of the lens barrel, located between the fourth lens and the fifth lens, and in direct contact with the image side of the fourth lens.

[0092] By setting a fourth spacer element P4 or a first protrusion P01 between the fourth lens and the fifth lens, the outer diameter settings of the two lenses (the fourth lens and the fifth lens) will be more reasonable. Depending on the assembly requirements, the spacer element or the protrusion between the fourth lens and the fifth lens can be adjusted. Using the protrusion can solve the problem of assembly eccentricity at this position, while using the spacer element design is more flexible and can achieve the goal of minimizing the lens shape and saving materials.

[0093] In some embodiments of the present invention, the spacer element further includes a seventh spacer element P7 located between the seventh lens and the eighth lens and in direct contact with the image-side surface of the seventh lens; or

[0094] A second protrusion P02 is provided on the inner ring surface of the lens barrel, located between the seventh lens and the eighth lens, and in direct contact with the image side of the seventh lens.

[0095] A seventh spacer element P7 or a second protrusion P02 is set between the seventh lens and the eighth lens. The protrusion can solve the problem of assembly eccentricity at this position, while the spacer element design is more flexible and can achieve the goal of minimizing the lens shape and saving materials.

[0096] The preferred implementation method is determined based on the assembly requirements and specific optical simulation results.

[0097] In some embodiments of the present invention, the optical imaging lens satisfies: 5.11≤TAN(Semi-FOV)*d0s / f1≤5.89; where Semi-FOV is half of the maximum field of view of the camera lens, f1 is the effective focal length of the first lens, and d0s is the inner diameter of the front end face of the lens barrel closest to the object side.

[0098] When the above conditions are met, the field of view (FOV) of the optical imaging lens can be guaranteed to be between 216° and 220°. At the same time, the effective focal length of the first lens is effectively controlled, which indirectly guarantees the curvature of the S1 spherical surface (object side) and the S2 spherical surface (image side) of the first lens. This effectively improves its processing feasibility and stability, and increases the processing yield of the glass lens of the first lens.

[0099] In some embodiments of the present invention, the optical imaging lens further includes a locking ring, the object-side end of which abuts against the edge of the object-side surface of the first lens; the optical imaging lens satisfies: 1.8≤CT1 / (SAG12-SAG11)≤2.89; wherein, CT1 is the center thickness of the first lens on the optical axis, SAG11 is the axial displacement between the intersection of the object-side surface of the first lens and the optical axis and the vertex of the effective radius of the optical region of the object-side surface of the first lens, and SAG12 is the axial displacement between the intersection of the image-side surface of the first lens and the optical axis and the vertex of the effective radius of the optical region of the image-side surface of the first lens.

[0100] This application is preferably applicable to fisheye lenses used for obstacle avoidance. To achieve obstacle avoidance performance, the first lens is a spherical glass lens (G lens) with a large curvature S1 surface (object side) that is convex. In this case, the condition 1.8≤CT1 / (SAG12-SAG11)≤2.89. Due to the large curvature of the initial S1 surface of the G lens and the limitations of the processing technology, the G lens cannot be made into a flange part with a suitable shape and sufficient size like a plastic lens (P lens). Therefore, it is impossible to achieve a stable adhesive structure with the lens barrel. Moreover, the appearance of the lens after adhesive application is generally quite different, and the overflow of adhesive is difficult to control. However, the appearance of the lens is more uniform after setting the locking ring. At the same time, the locking ring can apply a stable locking pressure to the inside of the lens, making the inside of the lens tighter and contributing to mechanical reliability.

[0101] In some embodiments of the present invention, the optical imaging lens satisfies: 1.33≤CT2 / (SAG22-SAG21)≤2.04; where CT2 is the center thickness of the second lens on the optical axis, SAG21 is the axial displacement between the intersection of the object-side surface of the second lens and the optical axis and the vertex of the effective radius of the optical region of the object-side surface of the second lens, and SAG22 is the axial displacement between the intersection of the image-side surface of the second lens and the optical axis and the vertex of the effective radius of the optical region of the image-side surface of the second lens.

[0102] In order to successfully receive the wide range of light rays from each field of view after passing through the first lens and convert them into outgoing light rays with appropriate angles through internal refraction of the second lens, the shape of the two surfaces of the second lens must meet the above conditions to achieve a balance between the formability and functionality of the second lens. That is, the curvature of the two surfaces can not only meet the needs of the optical system, but also ensure the stability of the actual lens forming, which helps to improve the forming yield of the lens and the performance yield of the lens.

[0103] In some embodiments of the present invention, the optical imaging lens satisfies: -4.27≤f2 / EP02≤-2.55; where f2 is the effective focal length of the second lens, and EP02 is the spacing between the front end face of the lens barrel and the second spacer element.

[0104] When the above conditions are met, the effective focal length of the second lens can be guaranteed to be within the required range, and the edge thickness level of the second lens can be indirectly affected, thus ensuring its thickness-to-thickness ratio, reducing the probability of weld lines during molding, and improving product yield.

[0105] In some embodiments of the present invention, the optical imaging lens satisfies: 1.03≤R5 / d2m≤1.69; where R5 is the radius of curvature of the object side of the third lens, and d2m is the inner diameter of the image side of the second spacer element.

[0106] When the above conditions are met, the inner diameter of the second spacer element is effectively guaranteed, which is beneficial for blocking light entering at large angles. The third lens improves the overall stray light level of the lens.

[0107] In some embodiments of the present invention, the optical imaging lens satisfies: 20.28≤(CT4+CT5) / (T45+T56)≤31.22; where CT4 is the center thickness of the fourth lens on the optical axis, CT5 is the center thickness of the fifth lens on the optical axis, T45 is the air gap between the fourth and fifth lenses on the optical axis, and T56 is the air gap between the fifth and sixth lenses on the optical axis.

[0108] When the above conditions are met, the center thickness of the fourth and fifth lenses, as well as the size of the fourth and fifth air gaps, can be effectively controlled, indirectly ensuring the uniformity of the wall thickness of the fourth and fifth lenses, which helps to improve the forming stability of the fourth and fifth lenses. At the same time, the reasonable setting of CT4, CT5, T45 and T56 helps to ensure a smooth refraction transition of imaging light in the middle of the optical system.

[0109] A second aspect of this application provides an optical imaging lens, including an optical lens group. The optical lens group may include 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. A fifth spacer element is disposed between the fifth lens and the sixth lens.

[0110] The optical imaging lens satisfies: -1.67≤(D5m-d5m) / R11≤-0.32;

[0111] Where R11 is the radius of curvature of the object side of the sixth lens, D5m is the outer diameter of the image side of the fifth spacer element, and d5m is the inner diameter of the image side of the fifth spacer element.

[0112] When the above conditions are met, the radius of curvature of the object side of the sixth lens and the inner and outer diameters of the fifth spacer element can be reasonably set, which helps to control and reduce the invalid light path entering the structure of the sixth lens and to intercept the internal reflection stray light path exiting the sixth lens, thereby improving the overall imaging level of the lens and improving the image purity.

[0113] A third aspect of this application provides an optical imaging lens, including an optical lens group. The optical lens group may include 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. A second spacer element is disposed between the second lens and the third lens, and a third spacer element is disposed between the third lens and the fourth lens. The optical imaging lens satisfies: 0.12≤(EP23-d2m) / T23≤0.28, where EP23 is the spacing between the second spacer element and the third spacer element, d2m is the inner diameter of the image side surface of the second spacer element, and T23 is the air gap between the second lens and the third lens.

[0114] When the above conditions are met, the problem of assembly misalignment can be avoided. At the same time, it is beneficial for the inner diameter surface of the second spacer element to intercept stray light reflected from the lens barrel, achieving a dual optimization of mechanical stability and stray light suppression. When the ratio (EP23-d2m) / T23 < 0.12, the ring band is too narrow, which easily leads to assembly misalignment and causes coma asymmetry; when (EP23-d2m) / T23 > 0.28, the ring band is too wide, which blocks effective light and reduces the consistency of aperture number Fno.

[0115] 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.

[0116] 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 system. The optical 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.

[0117] 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 the optical system, 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 the optical lens, thereby reducing the number of lenses and the size of the lenses, and achieving lens miniaturization.

[0118] When an aspherical lens is used, the shapes of each aspherical surface of the optical lens satisfy the following equation:

[0119]

[0120] 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.

[0121] 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 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 equivalent substitutions and are included within the protection scope of the present invention.

[0122] Example 1

[0123] The following is for reference Figures 2A to 2E The optical imaging lens 1001 and optical imaging lens 1002 according to Embodiment 1 of this application are described. Figure 2A and Figure 2B Schematic diagrams of the optical imaging lens 1001 and optical imaging lens 1002 according to Embodiment 1 of this application are shown respectively.

[0124] like Figure 2A and Figure 2B As shown, the structural schematic diagrams of optical imaging lenses 1001 and 1002 both include a lens barrel structure P0, an imaging lens group, and multiple spacer elements. The lens barrel structure P0 is provided with a second protrusion P02. The imaging lens group includes a first lens E1 to an eighth lens E8 and a protective glass E9, and is equipped with a locking ring P10. The multiple spacer elements include a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, and a sixth spacer element P6. The fourth spacer element is located between the fourth lens and the fifth lens and is in direct contact with the image side of the fourth lens.

[0125] In Embodiment 1, the schematic diagrams of optical imaging lenses 1001 and 1002 show the same imaging lens group, which, from the object side to the image side, sequentially includes: a first lens E1, a second lens E2, a third lens E3, an aperture stop S10, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8. Specifically, the first lens E1 has negative optical power, with its object side S1 being convex and its image side S2 being concave. The second lens E2 has negative optical power, with its object side S3 being convex and its image side S4 being concave. The third lens E3 has positive optical power, with its object side S5 being convex and its image side S6 being concave. The fourth lens E4 has positive optical power, with its object side S7 being concave and its image side S8 being convex. The fifth lens E5 has positive optical power, with its object side S9 being convex and its image side S10 being convex. The sixth lens E6 has negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being convex. 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 positive 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 on the imaging surface S19. S17 and S18 are two surfaces of the protective glass E9, or two surfaces of the filter.

[0126] Table 1 lists the relevant parameters of each lens in the optical imaging lens of this embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, Abbe number and conic coefficient, wherein the units of radius of curvature and thickness are millimeters (mm).

[0127]

[0128]

[0129] Table 1

[0130] Table 2 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 A 22 A 24 A 26 A 28 and A 30 .

[0131] Face number <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> <![CDATA[A 10 ]]> <![CDATA[A 12 ]]> <![CDATA[A 14 ]]> <![CDATA[A 16 ]]> S3 1.4173E-03 -3.0000E-02 2.2981E-02 -1.2318E-02 2.0154E-03 1.3546E-03 -8.3090E-04 S4 -2.2212E-01 1.8339E+00 -1.2526E+01 5.2510E+01 -1.4698E+02 2.8732E+02 -4.0220E+02 S5 4.2425E-02 1.7984E-01 -8.5814E-01 3.8665E+00 -1.3331E+01 3.3977E+01 -6.2416E+01 S6 2.4061E-01 -3.0752E+00 3.6324E+01 -2.6586E+02 1.3031E+03 -4.4437E+03 1.0797E+04 S7 3.5104E-02 -4.8600E-01 3.0942E+00 -1.0651E+01 1.8800E+01 -7.2706E+00 -3.8336E+01 S8 -9.3485E-03 5.4617E-02 -2.1799E-01 3.6824E-02 2.6701E+00 -1.1436E+01 2.5958E+01 S11 2.5765E-01 -2.7126E-01 2.4077E-01 -1.2715E-01 -3.2547E-02 1.2950E-01 -1.2301E-01 S12 2.0595E-01 -3.8744E-01 6.5922E-01 -8.1267E-01 7.1721E-01 -4.6183E-01 2.2021E-01 S13 1.7900E-02 -3.2641E-01 6.9529E-01 -8.9108E-01 7.8660E-01 -5.0136E-01 2.3580E-01 S14 2.0021E-02 -1.1225E-01 2.0663E-01 -2.5158E-01 2.1598E-01 -1.3352E-01 6.0210E-02 S15 2.6560E-05 7.8315E-03 -7.4996E-03 3.3668E-03 -9.3681E-04 1.8780E-04 -2.9163E-05 S16 1.1256E-03 2.2849E-02 -1.5010E-02 4.1827E-03 -4.9814E-04 -1.1293E-05 1.0421E-05 Face number <![CDATA[A 18 ]]> <![CDATA[A 20 ]]> <![CDATA[A 22 ]]> <![CDATA[A 24 ]]> <![CDATA[A 26 ]]> <![CDATA[A 28 ]]> <![CDATA[A 30 ]]> S3 1.8145E-04 -8.4523E-06 -4.4036E-06 1.0992E-06 -1.2032E-07 6.7105E-09 -1.5523E-10 S4 4.0791E+02 -2.9989E+02 1.5804E+02 -5.8104E+01 1.4135E+01 -2.0420E+00 1.3248E-01 S5 8.1812E+01 -7.6098E+01 4.9684E+01 -2.2217E+01 6.4724E+00 -1.1058E+00 8.4024E-02 S6 -1.8924E+04 2.3976E+04 -2.1738E+04 1.3746E+04 -5.7549E+03 1.4330E+03 -1.6060E+02 S7 8.8348E+01 -9.3790E+01 5.5595E+01 -1.7693E+01 2.3522E+00 0.0000E+00 0.0000E+00 S8 -3.7809E+01 3.7381E+01 -2.5429E+01 1.1742E+01 -3.5192E+00 6.1774E-01 -4.8215E-02 S11 6.8186E-02 -2.4622E-02 5.8828E-03 -9.0286E-04 8.1968E-05 -3.6105E-06 3.7992E-08 S12 -7.8236E-02 2.0648E-02 -3.9923E-03 5.4937E-04 -5.0932E-05 2.8507E-06 -7.2730E-08 S13 -8.2517E-02 2.1434E-02 -4.0749E-03 5.5046E-04 -4.9982E-05 2.7320E-06 -6.7847E-08 S14 -1.9919E-02 4.8196E-03 -8.4143E-04 1.0302E-04 -8.3815E-06 4.0656E-07 -8.8914E-09 S15 3.2572E-06 -2.1799E-07 6.3016E-09 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S16 -1.2116E-06 5.9327E-08 -1.0381E-09 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00

[0132] Table 2

[0133] like Figure 2Aand Figure 2B As shown, both optical imaging lenses 1001 and 1002 include five spacer elements: a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, and a sixth spacer element P6. They also include a second protrusion P02 between a seventh lens and an eighth lens. In this embodiment, the five spacer elements are spacers that, together with the second protrusion P02, block excess external light from entering, allowing the lenses to better contact the lens barrel and enhancing the structural stability of optical imaging lenses 1001 and 1002.

[0134] The differences between optical imaging lenses 1001 and 1002 may lie in the size of the spacer element, the non-effective diameter area of ​​the lens, and the lens barrel structural parameters. Table 3 shows the basic parameters of the spacer element and lens barrel of optical imaging lenses 1001 and 1002 in Embodiment 1.

[0135] As an example, both optical imaging lens 1001 and optical imaging lens 1002 have a lens barrel P0.

[0136] Example 1 Parameters Optical Imaging Lens 1001 Optical imaging lens 1002 d0s(mm) 11.6170 11.6170 d2s(mm) 2.7880 2.9280 d2m(mm) 2.7880 2.9280 D2s(mm) 7.6000 7.7400 d3s(mm) 2.0700 2.2100 d3m(mm) 2.0700 2.2100 D3s(mm) 7.2350 7.3750 d5s(mm) 4.3040 4.3040 d5m (mm) 4.3040 4.3040 D5m (mm) 6.2400 6.3800 d6m (mm) 4.5220 4.6620 EP02(mm) 1.1100 1.1100 EP23(mm) 0.5780 0.5780 EP56(mm) 1.5570 1.4840

[0137] Table 3

[0138] Figure 2C 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, representing the distortion magnitude values ​​corresponding to different image heights. According to... Figures 2C to 2E As can be seen, the optical imaging lens given in Example 1 can achieve good imaging quality.

[0139] Example 2

[0140] The following is for reference Figures 3A to 3E The optical imaging lens 2001 and optical imaging lens 2002 according to Embodiment 2 of this application are described. Figure 3A and Figure 3B Schematic diagrams of the optical imaging lens 2001 and optical imaging lens 2002 according to Embodiment 2 of this application are shown respectively.

[0141] like Figure 3A and Figure 3BAs shown, the structural schematic diagrams of optical imaging lenses 2001 and 2002 both include a lens barrel structure P0, an imaging lens group, and multiple spacer elements. The lens barrel structure P0 is provided with a first protrusion P01. The imaging lens group includes a first lens E1 to an eighth lens E8 and a protective glass E9, and is equipped with a locking ring P10. The multiple spacer elements include a second spacer element P2, a third spacer element P3, a fifth spacer element P5, a sixth spacer element P6, and a seventh spacer element P7. Among them, the seventh spacer element is located between the seventh lens and the eighth lens and is in direct contact with the image side of the seventh lens.

[0142] In Embodiment 2, the schematic diagrams of optical imaging lenses 2001 and 2002 show the same imaging lens group, which, from the object side to the image side, includes: a first lens E1, a second lens E2, a third lens E3, an aperture stop S10, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8. Specifically, the first lens E1 has negative optical power, with its object side S1 being convex and its image side S2 being concave. The second lens E2 has negative optical power, with its object side S3 being convex and its image side S4 being concave. The third lens E3 has positive optical power, with its object side S5 being convex and its image side S6 being concave. The fourth lens E4 has positive optical power, with its object side S7 being concave and its image side S8 being convex. The fifth lens E5 has positive optical power, with its object side S9 being convex and its image side S10 being convex. The sixth lens E6 has negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being convex. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has positive 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 on the imaging surface S19. S17 and S18 are two surfaces of the protective glass E9, or two surfaces of the filter.

[0143] Table 4 lists the relevant parameters of each lens in the optical imaging lens of this embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, Abbe number and conic coefficient, wherein the units of radius of curvature and thickness are millimeters (mm).

[0144]

[0145]

[0146] Table 4

[0147] 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 14A 16 A 18 A 20 A 22 A 24 A 26 A 28 and A 30 .

[0148]

[0149]

[0150] Table 5

[0151] like Figure 3A and Figure 3B As shown, both optical imaging lenses 2001 and 2002 include five spacer elements: a second spacer element P2, a third spacer element P3, a fifth spacer element P5, a sixth spacer element P6, and a seventh spacer element P7. They also include a first protrusion P01 between the fourth and fifth lenses. In this embodiment, the five spacer elements are spacers that, together with the first protrusion P01, block excess external light from entering, allowing the lenses to better contact the lens barrel and enhancing the structural stability of optical imaging lenses 2001 and 2002.

[0152] The differences between optical imaging lens 2001 and optical imaging lens 2002 may lie in the size of the spacer element, the non-effective diameter area of ​​the lens, and the lens barrel structural parameters. Table 6 shows the basic parameters of the spacer element and lens barrel of optical imaging lens 2001 and optical imaging lens 2002 in Embodiment 2.

[0153] As an example, both optical imaging lens 2001 and optical imaging lens 2002 have a lens barrel P0.

[0154] Example 2 Parameters Optical Imaging Lens 2001 Optical Imaging Lens 2002 d0s(mm) 11.4930 11.4930 d2s(mm) 2.7600 2.8600 d2m(mm) 2.7600 2.8600 D2s(mm) 7.6000 7.7000 d3s(mm) 2.0540 2.1540 d3m(mm) 2.0540 2.1540 D3s(mm) 6.4000 6.5000 d5s(mm) 4.3050 4.4050 d5m (mm) 4.3100 4.4130 D5m (mm) 4.8590 4.8590 d6m (mm) 4.4470 4.5470 EP02(mm) 1.0300 1.0300 EP23(mm) 0.6120 0.6120 EP56(mm) 1.3430 1.2930

[0155] Table 6

[0156] Figure 3C 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 3D The 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 3E The distortion curve of the optical imaging lens in Embodiment 2 is shown, representing the distortion magnitude corresponding to different image heights. According to... Figures 3C to 3E It can be seen that the optical imaging lens given in Example 2 can achieve good imaging quality.

[0157] Example 3

[0158] The following is for reference Figures 4A to 4E The optical imaging lens 3001 and optical imaging lens 3002 according to Embodiment 3 of this application are described. Figure 4A and Figure 4B Schematic diagrams of the optical imaging lens 3001 and optical imaging lens 3002 according to Embodiment 3 of this application are shown respectively.

[0159] like Figure 4A and Figure 4B As shown, the structural schematic diagrams of optical imaging lenses 3001 and 3002 both include a lens barrel structure P0, an imaging lens group, and multiple spacer elements. The lens barrel structure P0 is provided with a first protrusion P01. The imaging lens group includes a first lens E1 to an eighth lens E8 and a protective glass E9, and is equipped with a locking ring P10. The multiple spacer elements include a second spacer element P2, a third spacer element P3, a fifth spacer element P5, a sixth spacer element P6, and a seventh spacer element P7.

[0160] In Embodiment 3, the schematic diagrams of optical imaging lenses 3001 and 3002 show the same imaging lens group, which, from the object side to the image side, sequentially includes: a first lens E1, a second lens E2, a third lens E3, an aperture stop S10, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8. Specifically, the first lens E1 has negative optical power, with its object side S1 being convex and its image side S2 being concave. The second lens E2 has negative optical power, with its object side S3 being convex and its image side S4 being concave. The third lens E3 has positive optical power, with its object side S5 being convex and its image side S6 being concave. The fourth lens E4 has positive optical power, with its object side S7 being concave and its image side S8 being convex. The fifth lens E5 has positive optical power, with its object side S9 being convex and its image side S10 being convex. The sixth lens, E6, has negative optical power; its object-side surface, S11, is concave, and its image-side surface, S12, is convex. The seventh lens, E7, has positive optical power; its object-side surface, S13, is convex, and its image-side surface, S14, is convex. The eighth lens, E8, has positive optical power; its object-side surface, S15, is concave, and its image-side surface, S16, is convex. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged on the imaging surface S19. S17 and S18 are two surfaces of the protective glass E9, or two surfaces of the filter.

[0161] Table 7 lists the relevant parameters of each lens in the optical imaging lens of this embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, Abbe number and conic coefficient, wherein the units of radius of curvature and thickness are millimeters (mm).

[0162] Surface serial number Surface type radius of curvature thickness Refractive index Abbe number Conic coefficient OBJ spherical endless endless S1 spherical 8.3719 0.5600 1.76 52.34 S2 spherical 2.8395 1.2709 S3 aspherical 1.8922 0.6678 1.54 55.71 -1.9728 S4 aspherical 0.8934 1.1203 -0.8164 S5 aspherical 3.5430 0.6155 1.68 19.25 2.2928 S6 aspherical 8.9756 0.3708 34.8910 STO spherical endless 0.0799 S7 aspherical -8.5231 1.2633 1.55 56.11 14.1437 S8 aspherical -1.7998 0.0364 -0.6113 S9 aspherical 7.4896 1.3910 1.68 54.90 -1.2220 S10 aspherical -2.5923 0.0945 0.0411 S11 aspherical -1.2860 0.5307 1.68 19.25 -0.9755 S12 aspherical -5.7063 0.0862 3.6818 S13 aspherical 2.9341 1.2853 1.54 55.71 -1.9475 S14 aspherical -5.1574 0.4096 -16.0367 S15 aspherical -20.0000 0.7920 1.54 55.71 50.0000 S16 aspherical -10.7206 0.6981 -99.9000 S17 spherical endless 0.2100 1.52 64.20 S18 spherical endless 0.1900 S19 spherical endless

[0163] Table 7

[0164] Table 8 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 A 22 A 24 A 26 A 28 and A 30 .

[0165]

[0166]

[0167] Table 8

[0168] like Figure 4A and Figure 4B As shown, both optical imaging lenses 3001 and 3002 include five spacer elements: a second spacer element P2, a third spacer element P3, a fifth spacer element P5, a sixth spacer element P6, and a seventh spacer element P7. They also include a first protrusion P01 between the seventh lens and the eighth lens. In this embodiment, the five spacer elements are spacers that, together with the first protrusion P01, block excess external light from entering, allowing the lenses to better contact the lens barrel and enhancing the structural stability of optical imaging lenses 3001 and 3002.

[0169] The differences between optical imaging lenses 3001 and 3002 may lie in the size of the spacer element, the non-effective diameter area of ​​the lens, and the lens barrel structural parameters. Table 9 shows the basic parameters of the spacer element and lens barrel of optical imaging lenses 3001 and 3002 in Embodiment 3.

[0170] As an example, both optical imaging lens 3001 and optical imaging lens 3002 have a lens barrel P0.

[0171]

[0172]

[0173] Table 9

[0174] Figure 4C 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 4DThe 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 4E The distortion curve of the optical imaging lens in Embodiment 3 is shown, representing the distortion magnitude corresponding to different image heights. According to... Figures 4C to 4E It can be seen that the optical imaging lens given in Example 3 can achieve good imaging quality.

[0175] Example 4

[0176] The following is for reference Figures 5A to 5E The optical imaging lens 4001 and optical imaging lens 4002 according to Embodiment 4 of this application are described. Figure 5A and Figure 5B Schematic diagrams of the optical imaging lens 4001 and optical imaging lens 4002 according to Embodiment 4 of this application are shown respectively.

[0177] like Figure 5A and Figure 5B As shown, the structural schematic diagrams of optical imaging lenses 4001 and 4002 both include a lens barrel structure P0, an imaging lens group, and multiple spacer elements. The lens barrel structure P0 is provided with a second protrusion P02. The imaging lens group includes a first lens E1 to an eighth lens E8 and a protective glass E9, and is equipped with a locking ring P10. The multiple spacer elements include a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, and a sixth spacer element P6.

[0178] In Embodiment 4, the schematic diagrams of optical imaging lenses 4001 and 4002 show the same imaging lens group, which, from the object side to the image side, sequentially includes: a first lens E1, a second lens E2, a third lens E3, an aperture stop S10, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8. Specifically, the first lens E1 has negative optical power, with its object side S1 being convex and its image side S2 being concave. The second lens E2 has negative optical power, with its object side S3 being convex and its image side S4 being concave. The third lens E3 has positive optical power, with its object side S5 being convex and its image side S6 being concave. The fourth lens E4 has positive optical power, with its object side S7 being concave and its image side S8 being convex. The fifth lens E5 has positive optical power, with its object side S9 being convex and its image side S10 being convex. The sixth lens E6 has negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being convex. 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 positive 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 on the imaging surface S19. S17 and S18 are two surfaces of the protective glass E9, or two surfaces of the filter.

[0179] Table 10 lists the relevant parameters of each lens in the optical imaging lens of this embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, Abbe number and conic coefficient, wherein the units of radius of curvature and thickness are millimeters (mm).

[0180] Surface serial number Surface type radius of curvature thickness Refractive index Abbe number Conic coefficient OBJ spherical endless endless S1 spherical 8.3671 0.5900 1.76 52.34 S2 spherical 2.9138 1.3673 S3 aspherical 2.3950 0.6575 1.54 55.71 -2.6802 S4 aspherical 1.0886 1.2502 -0.8843 S5 aspherical 2.9974 0.6152 1.68 19.25 1.9905 S6 aspherical 6.3717 0.2510 16.6232 STO spherical endless 0.1137 S7 aspherical -5.6147 1.0913 1.55 56.11 -44.6121 S8 aspherical -1.9516 0.0042 -1.6990 S9 aspherical 6.5765 1.4610 1.68 54.90 -10.2000 S10 aspherical -2.6156 0.0776 -0.1817 S11 aspherical -1.5356 0.5571 1.68 19.25 -0.9838 S12 aspherical -22.7987 0.1204 10.1352 S13 aspherical 2.7556 1.4270 1.54 55.71 -0.9635 S14 aspherical -38.4904 0.3032 88.8193 S15 aspherical 1.5988 0.6101 1.54 55.71 -6.6316 S16 aspherical 2.1677 0.8276 -16.5362 S17 spherical endless 0.2100 1.52 64.20 S18 spherical endless 0.2000 S19 spherical endless

[0181] Table 10

[0182] Table 11 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 A 22 A 24 A 26 A 28 and A 30 .

[0183]

[0184]

[0185] Table 11

[0186] like Figure 5A and Figure 5B As shown, both optical imaging lenses 4001 and 4002 include five spacer elements: a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, and a sixth spacer element P6. They also include a second protrusion P02 between a seventh lens and an eighth lens. In this embodiment, the five spacer elements are spacers that, together with the second protrusion P02, block excess external light from entering, allowing the lenses to better contact the lens barrel and enhancing the structural stability of optical imaging lenses 4001 and 4002.

[0187] The differences between optical imaging lenses 4001 and 4002 may lie in the size of the spacer element, the non-effective diameter area of ​​the lens, and the lens barrel structural parameters. Table 12 shows the basic parameters of the spacer element and lens barrel of optical imaging lenses 4001 and 4002 in Embodiment 4.

[0188] As an example, both optical imaging lens 4001 and optical imaging lens 4002 have a lens barrel P0.

[0189]

[0190]

[0191] Table 12

[0192] Figure 5C The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 4 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 5D The astigmatism curve of the optical imaging lens of Embodiment 4 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 5E The distortion curve of the optical imaging lens in Embodiment 4 is shown, representing the distortion magnitude values ​​corresponding to different image heights. According to... Figures 5C to 5E It can be seen that the optical imaging lens given in Example 4 can achieve good imaging quality.

[0193] In summary, the optical parameters of the optical imaging lenses 1001, 1002, 2001, 2002, 3001, 3002, 4001 and 4002 in Examples 1 to 4 are shown in Table 13 below.

[0194]

[0195]

[0196] Table 13

[0197] The optical imaging lenses 1001, 1002, 2001, 2002, 3001, 3002, 4001 and 4002 of Embodiments 1 to 4 satisfy the relationship shown in Table 14.

[0198]

[0199] Table 14

[0200] 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 disposed 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, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, all having optical power, for a total of eight lenses with optical power. The first lens has negative optical power, with a convex object-side surface and a concave image-side surface; the second lens has negative optical power, with a convex object-side surface and a concave image-side surface; the third lens has positive optical power, with a convex object-side surface and a concave image-side surface; the fourth lens has positive optical power, with a concave object-side surface and a convex image-side surface; the fifth lens has positive optical power, with a convex object-side surface and a convex image-side surface; the sixth lens has negative optical power, with a concave object-side surface and a convex image-side surface; the seventh lens has positive optical power, with a convex object-side surface; and the eighth lens has positive optical power. The plurality of spacer elements includes a second spacer element located between the second lens and the third lens and in direct contact with the image side of the second lens; The optical imaging lens satisfies: 3.22≤D²s / R³≤5.31 and 2.59≤d²s / R₄≤3.83; Wherein, R3 is the radius of curvature of the object side surface of the second lens, R4 is the radius of curvature of the image side surface of the second lens, D2s is the outer diameter of the object side surface of the second spacer element, and d2s is the inner diameter of the object side surface of the second spacer element. The optical imaging lens further includes a locking ring, the object-side end of which abuts against the edge of the object-side surface of the first lens; The optical imaging lens satisfies: 1.8≤CT1 / (SAG12-SAG11)≤2.9; Wherein, CT1 is the center thickness of the first lens on the optical axis, SAG11 is the axial displacement between the intersection of the object side surface of the first lens and the optical axis and the vertex of the effective radius of the optical region of the object side surface of the first lens, and SAG12 is the axial displacement between the intersection of the image side surface of the first lens and the optical axis and the vertex of the effective radius of the optical region of the image side surface of the first lens. The optical imaging lens satisfies: 1.33≤CT2 / (SAG22-SAG21)≤2.04; Wherein, CT2 is the center thickness of the second lens on the optical axis, SAG21 is the axial displacement between the intersection of the object side surface of the second lens and the optical axis and the vertex of the effective radius of the optical region of the object side surface of the second lens, and SAG22 is the axial displacement between the intersection of the image side surface of the second lens and the optical axis and the vertex of the effective radius of the optical region of the image side surface of the second lens.

2. The optical imaging lens according to claim 1, characterized in that, The plurality of spacers also includes a third spacer located between the third lens and the fourth lens and in direct contact with the image side of the third lens; The optical imaging lens satisfies: 1.99≤(EP23+CT3) / SAG31≤3.04; Wherein, EP23 is the spacing between the second spacer element and the third spacer element, SAG31 is the axial displacement between the intersection of the object side surface of the third lens and the optical axis and the vertex of the effective radius of the optical region of the object side surface of the third lens, and CT3 is the center thickness of the third lens on the optical axis.

3. The optical imaging lens according to claim 2, characterized in that, The optical imaging lens satisfies: 1.17≤R6 / (D3s-d3s)≤2.03; Wherein, R6 is the radius of curvature of the image side of the third lens, D3s is the outer diameter of the object side of the third spacer element, and d3s is the inner diameter of the object side of the third spacer element.

4. The optical imaging lens according to claim 2, characterized in that, The optical imaging lens satisfies: -7.39≤R7 / d3m≤-2.8; Wherein, R7 is the radius of curvature of the object side of the fourth lens, and d3m is the inner diameter of the image side of the third spacer element.

5. The optical imaging lens according to claim 1, characterized in that, The plurality of spacers also includes a fifth spacer located between the fifth lens and the sixth lens and in direct contact with the image side of the fifth lens; The optical imaging lens satisfies: 1.53≤R9 / d5s≤2.11; Wherein, R9 is the radius of curvature of the object-side surface of the fifth lens, and d5s is the inner diameter of the object-side surface of the fifth spacer element.

6. The optical imaging lens according to claim 5, characterized in that, The optical imaging lens satisfies: -1.67≤(D5m-d5m) / R11≤-0.32; Wherein, R11 is the radius of curvature of the object side of the sixth lens, D5m is the outer diameter of the image side of the fifth spacer element, and d5m is the inner diameter of the image side of the fifth spacer element.

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 in direct contact with the image side of the sixth lens; The optical imaging lens satisfies: 1.3≤d6m / R13≤2.06; Wherein, d6m is the inner diameter of the image side of the sixth spacer element, and R13 is the radius of curvature of the object side of the seventh lens.

8. The optical imaging lens according to claim 7, characterized in that, The optical imaging lens satisfies: 2.3≤EP56 / CT6≤3.1; Wherein, EP56 is the spacing between the fifth spacer element and the sixth spacer element, and CT6 is the center thickness of the sixth lens on the optical axis.

9. The optical imaging lens according to any one of claims 1-8, characterized in that, The plurality of spacers further includes a fourth spacer located between the fourth lens and the fifth lens and in direct contact with the image-side surface of the fourth lens; or The inner ring surface of the lens barrel is provided with a first protrusion located between the fourth lens and the fifth lens, and in direct contact with the image side surface of the fourth lens.

10. The optical imaging lens according to any one of claims 1-8, characterized in that, The plurality of spacers also includes a seventh spacer located between the seventh lens and the eighth lens and in direct contact with the image-side surface of the seventh lens; or The inner ring surface of the lens barrel is provided with a second protrusion located between the seventh lens and the eighth lens, and in direct contact with the image side surface of the seventh lens.

11. The optical imaging lens according to any one of claims 1-8, characterized in that, The optical imaging lens satisfies: 5.11≤TAN(Semi-FOV)*d0s / f1≤5.89; Wherein, Semi-FOV is half of the maximum field of view of the camera lens, f1 is the effective focal length of the first lens, and d0s is the inner diameter of the front end face of the lens barrel closest to the object side.

12. The optical imaging lens according to any one of claims 1-8, characterized in that, The optical imaging lens satisfies: -4.27≤f2 / EP02≤-2.55; Where f2 is the effective focal length of the second lens, and EP02 is the spacing between the front end face of the lens barrel and the second spacer element.

13. The optical imaging lens according to any one of claims 1-8, characterized in that, The optical imaging lens satisfies the following condition: 1.03 ≤ R5 / d2m ≤ 1.69; Wherein, R5 is the radius of curvature of the object side of the third lens, and d2m is the inner diameter of the image side of the second spacer element.

14. The optical imaging lens according to any one of claims 1-8, characterized in that, The optical imaging lens satisfies: 20.28≤(CT4+CT5) / (T45+T56)≤31.22; Wherein, CT4 is the center thickness of the fourth lens on the optical axis, CT5 is the center thickness of the fifth lens on the optical axis, T45 is the air gap between the fourth lens and 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.

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