Optical imaging system

Abstract

The application provides an optical imaging system, which comprises a first lens barrel and a second lens barrel in sequence along an optical axis, the first lens barrel comprises a first lens and a second lens in sequence, the second lens barrel comprises a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens in sequence, a first spacing element is arranged between the two lenses in the first lens barrel, and a spacing element is arranged between each two adjacent lenses in the second lens barrel, the optical imaging system satisfies 3.40 < Lb / La < 4.70 and 5.80 < f345 / (EP34+EP45) < 6.50.

Description

Technical Field

[0001] This application relates to the field of optical device technology, and in particular to an optical imaging system. Background Technology

[0002] With the widespread adoption and development of mobile devices (such as smartphones and tablets), users' demands for their photography functions are increasing. Among various photography scenarios, telephoto shooting capabilities have received widespread attention, especially when shooting distant objects, sporting events, and wildlife. Telephoto lenses can help users obtain clear, detailed images without having to get close to the subject.

[0003] In the field of optical imaging system design, periscope structures are gradually gaining attention. Periscope technology was originally used in areas such as submarine observation. Its core principle is to change the direction of light through mirrors or prisms, causing light to reflect multiple times within a limited space, thereby effectively extending the optical path. Introducing periscope structures into the optical imaging systems of mobile devices promises to achieve longer focal lengths without significantly increasing the thickness of the equipment. Currently, although there have been some explorations and applications of periscope imaging systems, many technical challenges remain to be solved in the optimized design of telephoto lenses. For example, how to achieve lens miniaturization while ensuring better formability and structural strength of the lenses, thereby improving lens yield. Summary of the Invention

[0004] This application provides an optical imaging system, which includes a first lens tube and a second lens tube in sequence from the object side to the image side along the optical axis.

[0005] The first lens barrel sequentially includes: a first lens with positive optical power, the object side of the first lens being convex and the image side of the first lens being convex; a second lens with negative optical power; and a first spacer element disposed between the first lens and the second lens, wherein the first spacer element abuts against the image side of the first lens.

[0006] The second lens barrel sequentially includes: a third lens with positive optical power, wherein the object-side surface of the third lens is convex and the image-side surface of the third lens is convex; a fourth lens with negative optical power, wherein the object-side surface of the fourth lens is convex and the image-side surface of the fourth lens is concave; a fifth lens with positive optical power, wherein the object-side surface of the fifth lens is convex and the image-side surface of the fifth lens is convex; a sixth lens with negative optical power, wherein the object-side surface of the sixth lens is concave and the image-side surface of the sixth lens is convex; a seventh lens with either positive or negative optical power; and an eighth lens with negative optical power, wherein the object-side surface of the eighth lens is convex and the image-side surface of the eighth lens is concave; in the third A third spacer element is provided between the lens and the fourth lens, and the third spacer element abuts against the image-side surface of the third lens; a fourth spacer element is provided between the fourth lens and the fifth lens, and the fourth spacer element abuts against the image-side surface of the fourth lens; a fifth spacer element is provided between the fifth lens and the sixth lens, and the fifth spacer element abuts against the image-side surface of the fifth lens; a sixth spacer element is provided between the sixth lens and the seventh lens, and the sixth spacer element abuts against the image-side surface of the sixth lens; a seventh spacer element is provided between the seventh lens and the eighth lens, and the seventh spacer element abuts against the image-side surface of the seventh lens.

[0007] The optical imaging system satisfies: 3.40 < Lb / La < 4.70; 5.80 < f345 / (EP34+EP45) < 6.50; where Lb is the maximum height of the second lens barrel, La is the maximum height of the first lens barrel, f345 is the combined focal length of the third lens, the fourth lens and the fifth lens, 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, and EP45 is the distance from the image side of the fourth spacer element to the object side of the fifth spacer element along the optical axis.

[0008] According to some embodiments of this application, the optical imaging system also satisfies: 16.15 < f12 / La < 20.75; where f12 is the combined focal length of the first lens and the second lens, and La is the maximum height of the first lens barrel.

[0009] According to some embodiments of this application, the optical imaging system also satisfies: -6.60≤f678 / (EP56+EP67)≤-3.97; where f678 is the combined focal length of the sixth lens, the seventh lens, and the eighth lens, 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.

[0010] According to some embodiments of this application, the optical imaging system also satisfies: 4.95 < d1s / (CT1+CT2) < 5.50; where d1s is the inner diameter of the side of the first spacer element, CT1 is the center thickness of the first lens on the optical axis, and CT2 is the center thickness of the second lens on the optical axis.

[0011] According to some embodiments of this application, the optical imaging system also satisfies: 1.43≤(Das-das) / EP01≤5.20; where Das is the outer diameter of the side surface of the first lens barrel, das is the inner diameter of the side surface of the first lens barrel, and EP01 is the distance from the side surface of the first lens barrel to the side surface of the first spacer element along the optical axis.

[0012] According to some embodiments of this application, the optical imaging system also satisfies: 0.80 < (Dam-dam) / (D1m-d1m) < 2.20; where Dam is the outer diameter of the image side of the first lens barrel, dam is the inner diameter of the image side of the first lens barrel, D1m is the outer diameter of the image side of the first spacer element, and d1m is the inner diameter of the image side of the first spacer element.

[0013] According to some embodiments of this application, the optical imaging system also satisfies: 3.54≤f3 / (D3s-d3s)≤6.10; where f3 is the effective focal length of the third lens, D3s is the outer diameter of the side surface of the third spacer element, and d3s is the inner diameter of the side surface of the third spacer element.

[0014] According to some embodiments of this application, the optical imaging system further satisfies: 1.55≤(CP5+EP56) / (T56+CT6)≤1.96; where CP5 is the maximum thickness of the fifth spacer element along the optical axis, EP56 is the distance from the image side of the fifth spacer element to the object side of the sixth spacer element along the optical axis, T56 is the air gap between the fifth lens and the sixth lens on the optical axis, and CT6 is the center thickness of the sixth lens on the optical axis.

[0015] According to some embodiments of this application, the optical imaging system also satisfies: 4.46≤(d4s+d4m) / R8≤4.95; where d4s is the inner diameter of the object side of the fourth spacer element, d4m is the inner diameter of the image side of the fourth spacer element, and R8 is the radius of curvature of the image side of the fourth lens.

[0016] According to some embodiments of this application, the optical imaging system further satisfies: 0.50≤(Dbm-dbm) / (Dbs-dbs)≤5.58; where Dbm is the outer diameter of the image side of the second lens barrel, dbm is the inner diameter of the image side of the second lens barrel, Dbs is the outer diameter of the object side of the second lens barrel, and dbs is the inner diameter of the object side of the second lens barrel.

[0017] According to some embodiments of this application, the optical imaging system also satisfies: 1.20≤(d5s+d5m) / f5≤1.71; where d5s is the inner diameter of the object side of the fifth spacer element, d5m is the inner diameter of the image side of the fifth spacer element, and f5 is the effective focal length of the fifth lens.

[0018] According to some embodiments of this application, the optical imaging system also satisfies: 7.83≤d6s / T67≤17.88; where d6s is the inner diameter of the side of the sixth spacer element, and T67 is the air gap between the sixth lens and the seventh lens on the optical axis.

[0019] According to some embodiments of this application, the optical imaging system also satisfies: 4.65≤D7m / (CT7+CT8)≤7.42; where D7m is the outer diameter of the image side of the seventh spacer element, CT7 is the center thickness of the seventh lens on the optical axis, and CT8 is the center thickness of the eighth lens on the optical axis.

[0020] According to some embodiments of this application, the optical imaging system also satisfies: 0.86≤R15 / d7m≤1.66; where R15 is the radius of curvature of the object side of the eighth lens, and d7m is the inner diameter of the image side of the seventh spacer element.

[0021] In summary, under the condition that 3.40 < Lb / La < 4.70, the total length of the second lens barrel in the optical imaging system is limited. Therefore, the edge thickness of the lenses within the second lens barrel must be limited, which leads to assembly stability issues for the lenses within the second lens barrel. Therefore, this application constrains the edge thickness of the third, fourth, and fifth lenses to 5.80 < f345 / (EP34+EP45) < 6.50, ensuring better lens formability and structural strength. This allows the lenses within the second lens barrel to maintain good structural stability during assembly and reliability verification, thereby improving lens yield. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of some structural parameters of an optical imaging system according to one embodiment of this application;

[0023] Figure 2This is a schematic diagram of another part of the structural parameters of an optical imaging system according to one embodiment of this application;

[0024] Figure 3 This is a schematic diagram of the structure of an optical imaging system according to Embodiment 1 of this application;

[0025] Figure 4 This is a schematic diagram of the structure of an optical imaging system according to Embodiment 2 of this application;

[0026] Figure 5 This is a schematic diagram of the structure of an optical imaging system according to Embodiment 3 of this application;

[0027] Figure 6A A schematic diagram of the on-axis chromatic aberration curves of the optical imaging systems of Embodiment 1, Embodiment 2 and Embodiment 3 according to this application is shown.

[0028] Figure 6B A schematic diagram of astigmatism curves of the optical imaging systems of Embodiment 1, Embodiment 2 and Embodiment 3 according to this application is shown.

[0029] Figure 6C The diagram shows the distortion curves of the optical imaging systems according to Embodiment 1, Embodiment 2 and Embodiment 3 of this application.

[0030] Figure 6D A schematic diagram of the magnification chromatic aberration curves of the optical imaging systems of Embodiment 1, Embodiment 2 and Embodiment 3 according to this application is shown.

[0031] Figure 7 This is a schematic diagram of the structure of an optical imaging system according to Embodiment 4 of this application;

[0032] Figure 8 This is a schematic diagram of the structure of an optical imaging system according to Embodiment 5 of this application;

[0033] Figure 9 This is a schematic diagram of the structure of an optical imaging system according to Embodiment Six of this application;

[0034] Figure 10A A schematic diagram of the on-axis chromatic aberration curves of the optical imaging systems of Embodiments 4, 5, and 6 according to this application is shown.

[0035] Figure 10B A schematic diagram of astigmatism curves of the optical imaging systems of Embodiments 4, 5, and 6 according to this application is shown.

[0036] Figure 10CThe diagram shows the distortion curves of the optical imaging systems of Embodiments 4, 5, and 6 according to this application.

[0037] Figure 10D A schematic diagram of the magnification chromatic aberration curves of the optical imaging systems of Embodiments 4, 5, and 6 according to this application is shown.

[0038] Figure 11 This is a schematic diagram of the structure of an optical imaging system according to Embodiment Seven of this application;

[0039] Figure 12 This is a schematic diagram of the structure of an optical imaging system according to Embodiment 8 of this application;

[0040] Figure 13 This is a schematic diagram of the structure of an optical imaging system according to Embodiment Nine of this application;

[0041] Figure 14A A schematic diagram of the on-axis chromatic aberration curves of the optical imaging systems of Embodiments 7, 8, and 9 according to this application is shown.

[0042] Figure 14B A schematic diagram of astigmatism curves of the optical imaging systems of Embodiments 7, 8, and 9 according to this application is shown.

[0043] Figure 14C A schematic diagram of the distortion curves of the optical imaging systems of Embodiments 7, 8, and 9 according to this application is shown.

[0044] Figure 14D A schematic diagram of the magnification chromatic aberration curves of the optical imaging systems of Embodiments 7, 8, and 9 according to this application is shown.

[0045] Figure 15 The stress diagram of the optical imaging system is shown when Lb / La=4.2 and f345 / (EP34+EP45)=6.2.

[0046] Figure 16 The stress diagram of the optical imaging system is shown when Lb / La=4.2 and f345 / (EP34+EP45)=5.3;

[0047] Figure 17 The stress diagram of the optical imaging system is shown when Lb / La=4.2 and f345 / (EP34+EP45)=6.8. Detailed Implementation

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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 a 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.

[0054] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other. The following embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this application. It should be pointed out that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0055] According to one aspect of this application, such as Figure 1 and Figure 2As shown, one embodiment of this application provides an optical imaging system, which includes a first lens barrel and a second lens barrel sequentially from the object side to the image side along the optical axis; wherein, the first lens barrel sequentially includes: a first lens with positive optical power, the object side of the first lens being convex, and the image side of the first lens being convex; a second lens with negative optical power; a first spacer element disposed between the first lens and the second lens, and the first spacer element abutting against the image side of the first lens; the second lens barrel sequentially includes: a third lens with positive optical power, the object side of the third lens being convex, the object side of the third lens being convex, and the image side of the second lens being convex; a second lens with negative optical power; and a first spacer element disposed between the first lens and the second lens, and the first spacer element abutting against the image side of the first lens; the second lens barrel sequentially includes: a third lens with positive optical power, the object side of the third lens being convex, and the image side of the second lens being convex. The image-side surface of the third lens is convex; the fourth lens has negative optical power, the object-side surface of the fourth lens is convex, and the image-side surface of the fourth lens is concave; the fifth lens has positive optical power, the object-side surface of the fifth lens is convex, and the image-side surface of the fifth lens is convex; the sixth lens has negative optical power, the object-side surface of the sixth lens is concave, and the image-side surface of the sixth lens is convex; the seventh lens has either positive or negative optical power; the eighth lens has negative optical power, the object-side surface of the eighth lens is convex, and the image-side surface of the eighth lens is concave; a third lens is disposed between the third lens and the fourth lens. Three spacer elements are provided, with the third spacer element abutting against the image-side surface of the third lens; a fourth spacer element is provided between the fourth and fifth lenses, abutting against the image-side surface of the fourth lens; a fifth spacer element is provided between the fifth and sixth lenses, abutting against the image-side surface of the fifth lens; a sixth spacer element is provided between the sixth and seventh lenses, abutting against the image-side surface of the sixth lens; and a seventh spacer element is provided between the seventh and eighth lenses, with the seventh spacer element... The element abuts against the image-side surface of the seventh lens; the optical imaging system satisfies: 3.40 < Lb / La < 4.70; 5.80 < f345 / (EP34+EP45) < 6.50; where Lb is the maximum height of the second lens barrel, La is the maximum height of the first lens barrel, f345 is the combined focal length of the third lens, the fourth lens and the fifth lens, EP34 is the distance along the optical axis from the image-side surface of the third spacer element to the object-side surface of the fourth spacer element, and EP45 is the distance along the optical axis from the image-side surface of the fourth spacer element to the object-side surface of the fifth spacer element.

[0056] The optical imaging system provided in the above embodiments of this application has limitations on the total length of the second lens barrel under the condition that 3.40 < Lb / La < 4.70. Therefore, the edge thickness of the lenses inside the second lens barrel must be limited, which leads to an issue with the assembly stability of the lenses inside the second lens barrel. Therefore, this application constrains 5.80 < f345 / (EP34+EP45) < 6.50, and by reasonably controlling the edge thickness of the third, fourth, and fifth lens edge structures, it ensures that the lenses have better formability and structural strength. This allows the lenses inside the second lens barrel to maintain good structural stability during the assembly process and reliability verification process, thereby improving the lens yield.

[0057] Figure 15 The stress diagram of the optical imaging system is shown when Lb / La = 4.2 and f345 / (EP34+EP45) = 6.2 is satisfied. At this time, the maximum stress in the optical imaging system is 3.79747 MPa. As can be seen from the figure, when the optical imaging system satisfies the constraints 3.40 < Lb / La < 4.70 and 5.80 < f345 / (EP34+EP45) < 6.50, the maximum stress value in the lens barrel is relatively small, the stress distribution is relatively dispersed, and the structural stability is good.

[0058] Figure 16 The diagram shows the stress of the optical imaging system when Lb / La = 4.2 and f345 / (EP34+EP45) = 5.3, at which point the maximum stress in the optical imaging system reaches 10.726 MPa. As can be seen from the figure, when the optical imaging system exceeds the lower limit of 5.80 < f345 / (EP34+EP45) < 6.50 while satisfying 3.40 < Lb / La < 4.70, the maximum stress value in the lens barrel is relatively high, which easily leads to stress concentration problems, lens deformation, and decreased assembly stability.

[0059] Figure 17 The diagram shows the stress of the optical imaging system when Lb / La = 4.2 and f345 / (EP34+EP45) = 6.8, at which point the maximum stress in the optical imaging system reaches 12.0445 MPa. As can be seen from the figure, when the optical imaging system exceeds the upper limit of 5.80 < f345 / (EP34+EP45) < 6.50 while satisfying 3.40 < Lb / La < 4.70, the maximum stress in the lens barrel is relatively large, which can easily lead to lens deformation and decreased assembly stability.

[0060] According to some embodiments of this application, the optical imaging system also satisfies: 16.15 < f12 / La < 20.75; where f12 is the combined focal length of the first lens and the second lens, and La is the maximum height of the first lens barrel. By controlling the ratio of f12 to La within a reasonable range, it indicates that a relatively large positive power lens needs to be placed within the limited lens barrel space to achieve light convergence and reduce the size of subsequent lenses.

[0061] According to some embodiments of this application, the optical imaging system further satisfies: -6.60 ≤ f678 / (EP56+EP67) ≤ -3.97; where f678 is the combined focal length of the sixth lens, the seventh lens, and the eighth lens; EP56 is the distance along the optical axis between the image-side surface of the fifth spacer element and the object-side surface of the sixth spacer element; and EP67 is the distance along the optical axis between the image-side surface of the sixth spacer element and the object-side surface of the seventh spacer element. By reasonably controlling this conditional range, the propagation path of light in the last three lenses can be optimized, aberrations can be reduced, and the sharpness and contrast of the image can be improved.

[0062] According to some embodiments of this application, the optical imaging system further satisfies: 4.95 < d1s / (CT1+CT2) < 5.50; where d1s is the inner diameter of the side surface of the first spacer element, CT1 is the center thickness of the first lens on the optical axis, and CT2 is the center thickness of the second lens on the optical axis. By reasonably controlling this conditional range, the light path can be controlled more precisely, ensuring that only light that meets the design requirements can pass through the lens, thereby improving image quality.

[0063] According to some embodiments of this application, the optical imaging system further satisfies: 1.43 ≤ (Das - das) / EP01 ≤ 5.20; where Das is the outer diameter of the side surface of the first lens barrel, das is the inner diameter of the side surface of the first lens barrel, and EP01 is the distance along the optical axis from the side surface of the first lens barrel to the side surface of the first spacer element. The difference between Das and das affects the wall thickness of the circular edge of the first lens barrel. Reasonably controlling this conditional range can ensure the uniformity of the wall thickness of the first lens barrel, resulting in better roundness data of the inner diameter of the lens barrel and better assembly stability of the lens.

[0064] According to some embodiments of this application, the optical imaging system also satisfies: 3.54 ≤ f3 / (D3s-d3s) ≤ 6.10; where f3 is the effective focal length 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. The difference between D3s and d3s affects the light-blocking range of the third spacer element; by reasonably controlling this conditional range, while ensuring the strong light-gathering ability of the third lens, the internal stray light of this lens is reduced.

[0065] According to some embodiments of this application, the optical imaging system further satisfies: 1.55 ≤ (CP5 + EP56) / (T56 + CT6) ≤ 1.96; where CP5 is the maximum thickness of the fifth spacer element along the optical axis, EP56 is the distance from the image side of the fifth spacer element to the object side of the sixth spacer element along the optical axis, T56 is the air gap between the fifth lens and the sixth lens on the optical axis, and CT6 is the center thickness of the sixth lens on the optical axis. By reasonably controlling this conditional range, the sixth lens can be ensured to have good processing feasibility, and the accuracy of the bearing position of the fifth lens and the sixth lens after assembly can be effectively guaranteed, so that the optical parameters of the second group of lenses meet the design requirements.

[0066] According to some embodiments of this application, the optical imaging system further satisfies: 4.46 ≤ (d4s + d4m) / R8 ≤ 4.95; where d4s is the inner diameter of the object-side surface of the fourth spacer element, d4m is the inner diameter of the image-side surface of the fourth spacer element, and R8 is the radius of curvature of the image-side surface of the fourth lens. By reasonably controlling the range of this conditional expression, the degree of obstruction of the optical path of the fourth lens by the fourth spacer element is determined, thereby ensuring the imaging quality of the lens.

[0067] According to some embodiments of this application, the optical imaging system further satisfies: 0.50 ≤ (Dbm - dbm) / (Dbs - dbs) ≤ 5.58; where Dbm is the outer diameter of the image-side surface of the second lens barrel, dbm is the inner diameter of the image-side surface of the second lens barrel, Dbs is the outer diameter of the object-side surface of the second lens barrel, and dbs is the inner diameter of the object-side surface of the second lens barrel. By reasonably controlling this conditional range, the rationality and strength of the lens barrel structure can be guaranteed. A suitable ratio helps the lens barrel to bear the weight of the internal optical components and reduces the possibility of lens barrel deformation.

[0068] According to some embodiments of this application, the optical imaging system also satisfies: 1.20 ≤ (d5s + d5m) / f5 ≤ 1.71; where d5s is the inner diameter of the object-side surface of the fifth spacer element, d5m is the inner diameter of the image-side surface of the fifth spacer element, and f5 is the effective focal length of the fifth lens. By reasonably controlling this conditional range, the convergence of light of different wavelengths after passing through the lens group can be better controlled, reducing color blurring and color fringing caused by chromatic aberration, and making the image colors more accurate and clearer.

[0069] According to some embodiments of this application, the optical imaging system also satisfies: 7.83 ≤ d6s / T67 ≤ 17.88; where d6s is the inner diameter of the object-side surface of the sixth spacer element, and T67 is the air gap between the sixth lens and the seventh lens on the optical axis. The inner diameter of the object-side surface of the sixth spacer element can effectively intercept reflected light paths and reflective areas, improving the lens imaging quality. Reasonably controlling this conditional range helps ensure that the thickness of the imaging system is within a reasonable processing range, and also facilitates the spatial distribution of lenses, reducing the risk of collisions between lenses.

[0070] According to some embodiments of this application, the optical imaging system also satisfies: 4.65 ≤ D7m / (CT7+CT8) ≤ 7.42; where D7m is the outer diameter of the image-side surface of the seventh spacer element, CT7 is the center thickness of the seventh lens on the optical axis, and CT8 is the center thickness of the eighth lens on the optical axis. By reasonably controlling this conditional range, the light path can be controlled more precisely, ensuring that only light that meets the design requirements can pass through the lens, thereby improving image quality.

[0071] According to some embodiments of this application, the optical imaging system also satisfies: 0.86 ≤ R15 / d7m ≤ 1.66; where R15 is the radius of curvature of the object-side surface of the eighth lens, and d7m is the inner diameter of the image-side surface of the seventh spacer element. By reasonably controlling this conditional range, the optical parameters can be effectively controlled to improve lens reliability and image quality to a greater extent while meeting design requirements.

[0072] According to another aspect of this application, another embodiment of this application provides an optical imaging system comprising, sequentially from the object side to the image side along the optical axis, a first lens barrel and a second lens barrel; wherein, the first lens barrel sequentially comprises: a first lens having positive optical power, the object side of the first lens being convex and the image side of the first lens being convex; a second lens having negative optical power; a first spacer element disposed between the first lens and the second lens, and the first spacer element abutting against the image side of the first lens; the second lens barrel sequentially comprises: a first lens having positive optical power... A third lens, the object-side surface of which is convex, and the image-side surface of which is convex; a fourth lens with negative optical power, the object-side surface of which is convex, and the image-side surface of which is concave; a fifth lens with positive optical power, the object-side surface of which is convex, and the image-side surface of which is convex; a sixth lens with negative optical power, the object-side surface of which is concave, and the image-side surface of which is convex; a seventh lens with either positive or negative optical power; and an eighth lens with negative optical power, the object-side surface of which is convex. The image-side surface of the eighth lens is concave; a third spacer element is disposed between the third lens and the fourth lens, and the third spacer element abuts against the image-side surface of the third lens; a fourth spacer element is disposed between the fourth lens and the fifth lens, and the fourth spacer element abuts against the image-side surface of the fourth lens; a fifth spacer element is disposed between the fifth lens and the sixth lens, and the fifth spacer element abuts against the image-side surface of the fifth lens; a sixth spacer element is disposed between the sixth lens and the seventh lens, and the sixth spacer element abuts against the image-side surface of the sixth lens; a seventh spacer element is disposed between the seventh lens and the eighth lens, and the seventh spacer element abuts against the image-side surface of the seventh lens; the optical imaging system satisfies: 3.40 < Lb / La < 4.70; 0.80 < (Dam - dam) / (D1m - d1m) < 2.20; where Dam is the outer diameter of the image-side surface of the first lens barrel, dam is the inner diameter of the image-side surface of the first lens barrel, D1m is the outer diameter of the image-side surface of the first spacer element, and d1m is the inner diameter of the image-side surface of the first spacer element. Under the premise of 3.40 < Lb / La < 4.70, the total length of the first lens tube of the optical imaging system is subject to certain limitations. Since the difference between Dam and dam affects the wall thickness of the first lens tube, and the difference between D1m and d1m affects the wall thickness of the first spacer element, the main consideration is the dispensing space that affects the spacer element and the lens tube. By reasonably controlling the conditional range of 0.80 < (Dam-dam) / (D1m-d1m) < 2.20, the first lens tube can be guaranteed to have stronger push-off force and better reliability performance.

[0073] It should be noted that those skilled in the art should understand that the number of spacers constituting the optical imaging system can be changed to obtain the various results and advantages described in this specification without departing from the technical solutions claimed in this application, and this application does not specifically limit this. For example, the optical imaging system may also include other numbers of spacers than those described in the above embodiments, as needed.

[0074] The following describes some specific, non-limiting embodiments of the above-described embodiments of this application in more detail with reference to the accompanying drawings. For ease of description, in the following embodiments, OBJ represents the object plane of the optical imaging system, STO represents the surface of the aperture stop, S1 represents the object-side plane of the first lens E1, S2 represents the image-side plane of the first lens E1, S3 represents the object-side plane of the second lens E2, S4 represents the image-side plane of the second lens E2, S5 represents the object-side plane of the first prism PM1, S6 represents the image-side plane of the first prism PM1; S7 represents the object-side plane of the third lens E3, S8 represents the image-side plane of the third lens E3, S9 represents the object-side plane of the fourth lens E4, S10 represents the image-side plane of the fourth lens E4, and S11 represents... The object-side plane of the fifth lens E5, S12 represents the image-side plane of the fifth lens E5, S13 represents the object-side plane of the sixth lens E6, S14 represents the image-side plane of the sixth lens E6, S15 represents the object-side plane of the seventh lens E7, S16 represents the image-side plane of the seventh lens E7, S17 represents the object-side plane of the eighth lens E8, S18 represents the image-side plane of the eighth lens E8, S19 represents the object-side plane of the second prism PM2, S20 represents the image-side plane of the second prism PM2, S21 represents the object-side plane of the filter E9, S22 represents the image-side plane of the second filter E9, and S23 represents the image plane.

[0075] Example 1

[0076] like Figure 3 As shown, in this embodiment, the optical imaging system includes a first lens barrel Pa and a second lens barrel Pb arranged sequentially along the optical axis, wherein the first lens barrel Pa includes a first lens E1 and a second lens E2; wherein the second lens barrel Pb includes a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8.

[0077] In this embodiment, the first lens E1 has positive optical power, and the object-side surface S1 of the first lens E1 is convex and the image-side surface S2 is convex; the second lens E2 has negative optical power, and the object-side surface S3 of the second lens E2 is concave and the image-side surface S4 is convex; the third lens E3 has positive optical power, and the object-side surface S7 of the third lens E3 is convex and the image-side surface S8 is convex; the fourth lens E4 has negative optical power, and the object-side surface S9 of the fourth lens E4 is convex and the image-side surface S10 is concave. The fifth lens E5 has positive optical power, and its object-side surface S11 is convex and its image-side surface S12 is convex. The sixth lens E6 has negative optical power, and its object-side surface S13 is concave and its image-side surface S14 is convex. The seventh lens E7 has negative optical power, and its object-side surface S15 is convex and its image-side surface S16 is concave. The eighth lens E8 has negative optical power, and its object-side surface S17 is convex and its image-side surface S18 is concave.

[0078] In this embodiment, the first lens barrel Pa further includes a first spacer element P1 placed on the image side of the first lens E1 and abutting against the image side of the first lens E1, and the second lens barrel Pb further includes: a third spacer element P3 placed on the image side of the third lens E3 and abutting against the image side of the third lens E3; a fourth spacer element P4 placed on the image side of the fourth lens E4 and abutting against the image side of the fourth lens E4; a fifth spacer element P5 placed on the image side of the fifth lens E5 and abutting against the image side of the fifth lens E5; a sixth spacer element P6 placed on the image side of the sixth lens E6 and abutting against the image side of the sixth lens E6; and a seventh spacer element P7 placed on the image side of the seventh lens E7 and abutting against the image side of the seventh lens E7.

[0079] In addition, Table 1 shows the basic optical parameters of the optical imaging system of Embodiment 1, where the units of radius of curvature and thickness / distance are millimeters (mm).

[0080] Table 1

[0081]

[0082] In this embodiment, the object-side and image-side surfaces of the second lens E2 are spherical, and the object-side and image-side surfaces of any one of the first lens E1, the third lens E3 to the eighth lens E8 are aspherical. The surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0083] ;

[0084] Where x is the distance vector from the vertex of the aspherical surface at a height h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Tables 2 and 3 below give the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for the aspherical mirrors S1, S2, and S7 to S18 in Example 1.

[0085] Table 2

[0086]

[0087] Table 3

[0088]

[0089] Example 2

[0090] like Figure 4 As shown, in this embodiment, the optical imaging system includes a first lens barrel Pa and a second lens barrel Pb arranged sequentially along the optical axis, wherein the first lens barrel Pa includes a first lens E1 and a second lens E2; wherein the second lens barrel Pb includes a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8.

[0091] It is worth noting that, compared with Embodiment 1 above, the optical imaging system of Embodiment 2 has the same optical parameters, that is, the basic optical parameter table of the optical imaging system of Embodiment 2 is the same as Table 1, and the aspherical coefficient table is the same as Tables 2 and 3. However, the optical imaging system of Embodiment 2 has different structural parameters from the optical imaging system of Embodiment 1 above. That is, the difference between Embodiment 2 and Embodiment 1 is that the dimensional values ​​of some structural parameters of the lens barrel P0 and the spacer element in the optical imaging system are different. Specifically, the values ​​of each relevant structural parameter in Embodiment 2 are shown in Table 11 below.

[0092] Example 3

[0093] like Figure 5 As shown, in this embodiment, the optical imaging system includes a first lens barrel Pa and a second lens barrel Pb arranged sequentially along the optical axis, wherein the first lens barrel Pa includes a first lens E1 and a second lens E2; wherein the second lens barrel Pb includes a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8.

[0094] It is worth noting that, compared with Embodiment 1 above, the optical imaging system of Embodiment 3 has the same optical parameters, that is, the basic optical parameter table of the optical imaging system of Embodiment 3 is the same as Table 1, and the aspherical coefficient table is the same as Tables 2 and 3. However, the optical imaging system of Embodiment 3 has different structural parameters than the optical imaging system of Embodiment 1 above. That is, the difference between Embodiment 3 and Embodiment 1 is that the dimensional values ​​of some structural parameters of the lens barrel P0 and the spacer element in the optical imaging system are different. Specifically, the values ​​of each relevant structural parameter in Embodiment 3 are shown in Table 11 below.

[0095] The on-axis chromatic aberration curves of the optical imaging systems in Examples 1, 2, and 3 are as follows: Figure 6A As shown, it represents the degree of deviation of the focal point after light of different wavelengths passes through the optical imaging system; the astigmatism curves of the optical imaging systems in Embodiments 1, 2, and 3 are shown below. Figure 6B As shown, it represents the curvature of the meridional image plane and the curvature of the sagittal image plane. The distortion curves of the optical imaging systems in Embodiments 1, 2, and 3 are as follows: Figure 6C As shown, it represents the degree of image distortion. The magnification chromatic aberration curves of the optical imaging systems in Embodiments 1, 2, and 3 are as follows: Figure 6D As shown, this represents the degree of deviation of light of different wavelengths on the image plane after passing through an optical imaging system. According to... Figures 6A to 6D It can be seen that the optical imaging systems in Embodiment 1, Embodiment 2 and Embodiment 3 can all achieve good imaging quality.

[0096] Example 4

[0097] like Figure 7 As shown, in this embodiment, the optical imaging system includes a first lens barrel Pa and a second lens barrel Pb arranged sequentially along the optical axis, wherein the first lens barrel Pa includes a first lens E1 and a second lens E2; wherein the second lens barrel Pb includes a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8.

[0098] In this embodiment, the first lens E1 has positive optical power, and the object-side surface S1 of the first lens E1 is convex and the image-side surface S2 is convex; the second lens E2 has negative optical power, and the object-side surface S3 of the second lens E2 is convex and the image-side surface S4 is concave; the third lens E3 has positive optical power, and the object-side surface S7 of the third lens E3 is convex and the image-side surface S8 is convex; the fourth lens E4 has negative optical power, and the object-side surface S9 of the fourth lens E4 is convex and the image-side surface S10 is concave. The fifth lens E5 has positive optical power, and its object-side surface S11 is convex and its image-side surface S12 is convex. The sixth lens E6 has negative optical power, and its object-side surface S13 is concave and its image-side surface S14 is convex. The seventh lens E7 has negative optical power, and its object-side surface S15 is concave and its image-side surface S16 is convex. The eighth lens E8 has negative optical power, and its object-side surface S17 is convex and its image-side surface S18 is concave.

[0099] In this embodiment, the first lens barrel Pa further includes a first spacer element P1 placed on the image side of the first lens E1 and abutting against the image side of the first lens E1, and the second lens barrel Pb further includes: a third spacer element P3 placed on the image side of the third lens E3 and abutting against the image side of the third lens E3; a fourth spacer element P4 placed on the image side of the fourth lens E4 and abutting against the image side of the fourth lens E4; a fifth spacer element P5 placed on the image side of the fifth lens E5 and abutting against the image side of the fifth lens E5; a sixth spacer element P6 placed on the image side of the sixth lens E6 and abutting against the image side of the sixth lens E6; and a seventh spacer element P7 placed on the image side of the seventh lens E7 and abutting against the image side of the seventh lens E7.

[0100] In addition, Table 4 shows the basic optical parameters of the optical imaging system of Embodiment 4, where the units of radius of curvature and thickness / distance are millimeters (mm).

[0101] Table 4

[0102]

[0103] In this embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the eighth lens E8 are aspherical, and the surface shape of each aspherical lens can be defined by the aspherical formula given in the above embodiment 1.

[0104] Tables 5 and 6 below show the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for each aspherical mirror S1 to S4 and S7 to S18 in Example 4.

[0105] Table 5

[0106]

[0107] Table 6

[0108]

[0109] Example 5

[0110] like Figure 8 As shown, in this embodiment, the optical imaging system includes a first lens barrel Pa and a second lens barrel Pb arranged sequentially along the optical axis, wherein the first lens barrel Pa includes a first lens E1 and a second lens E2; wherein the second lens barrel Pb includes a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8.

[0111] It is worth noting that, compared with Embodiment 4 above, the optical imaging system of Embodiment 5 has the same optical parameters, that is, the basic optical parameter table of the optical imaging system of Embodiment 5 is the same as Table 4, and the aspherical coefficient table is the same as Tables 5 and 6. However, the optical imaging system of Embodiment 5 has different structural parameters than the optical imaging system of Embodiment 4 above. That is, the difference between Embodiment 5 and Embodiment 4 is that the dimensional values ​​of some structural parameters of the lens barrel P0 and multiple spacer elements in the optical imaging system are different. Specifically, the values ​​of each relevant structural parameter in Embodiment 5 are shown in Table 11 below.

[0112] Example 6

[0113] like Figure 9 As shown, in this embodiment, the optical imaging system includes a first lens barrel Pa and a second lens barrel Pb arranged sequentially along the optical axis, wherein the first lens barrel Pa includes a first lens E1 and a second lens E2; wherein the second lens barrel Pb includes a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8.

[0114] It is worth noting that, compared with Embodiment 4 above, the optical imaging system of Embodiment 6 has the same optical parameters, that is, the basic optical parameter table of the optical imaging system of Embodiment 6 is the same as Table 4, and the aspherical coefficient table is the same as Tables 5 and 6. However, the optical imaging system of Embodiment 6 has different structural parameters than the optical imaging system of Embodiment 4 above. That is, the difference between Embodiment 6 and Embodiment 4 is that the dimensional values ​​of some structural parameters of the lens barrel P0 and multiple spacer elements in the optical imaging system are different. Specifically, the values ​​of each relevant structural parameter in Embodiment 6 are shown in Table 11 below.

[0115] The on-axis chromatic aberration curves of the optical imaging systems in Examples 4, 5, and 6 are as follows: Figure 10A As shown, it represents the degree of deviation of the focal point after light of different wavelengths passes through the optical imaging system; the astigmatism curves of the optical imaging systems in Examples 4, 5, and 6 are shown below. Figure 10B As shown, it represents the curvature of the meridional image plane and the curvature of the sagittal image plane; the distortion curves of the optical imaging systems in Examples 4, 5, and 6 are as follows. Figure 10C As shown, it represents the degree of distortion in the actual image; the magnification chromatic aberration curves of the optical imaging systems in Examples 4, 5, and 6 are shown below. Figure 10D As shown, this represents the degree of deviation of light of different wavelengths on the image plane after passing through an optical imaging system. According to... Figures 10A to 10D It can be seen that the optical imaging systems in Embodiments 4, 5 and 6 can all achieve good imaging quality.

[0116] Example 7

[0117] like Figure 11 As shown, in this embodiment, the optical imaging system includes a first lens barrel Pa and a second lens barrel Pb arranged sequentially along the optical axis, wherein the first lens barrel Pa includes a first lens E1 and a second lens E2; wherein the second lens barrel Pb includes a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8.

[0118] In this embodiment, the first lens E1 has positive optical power, and the object-side surface S1 of the first lens E1 is convex and the image-side surface S2 is convex; the second lens E2 has negative optical power, and the object-side surface S3 of the second lens E2 is convex and the image-side surface S4 is concave; the third lens E3 has positive optical power, and the object-side surface S7 of the third lens E3 is convex and the image-side surface S8 is convex; the fourth lens E4 has negative optical power, and the object-side surface S9 of the fourth lens E4 is convex and the image-side surface S10 is concave. The fifth lens E5 has positive optical power, and its object-side surface S11 is convex and its image-side surface S12 is convex. The sixth lens E6 has negative optical power, and its object-side surface S13 is concave and its image-side surface S14 is convex. The seventh lens E7 has positive optical power, and its object-side surface S15 is concave and its image-side surface S16 is convex. The eighth lens E8 has negative optical power, and its object-side surface S17 is convex and its image-side surface S18 is concave.

[0119] In this embodiment, the first lens barrel Pa further includes a first spacer element P1 placed on the image side of the first lens E1 and abutting against the image side of the first lens E1, and the second lens barrel Pb further includes: a third spacer element P3 placed on the image side of the third lens E3 and abutting against the image side of the third lens E3; a fourth spacer element P4 placed on the image side of the fourth lens E4 and abutting against the image side of the fourth lens E4; a fifth spacer element P5 placed on the image side of the fifth lens E5 and abutting against the image side of the fifth lens E5; a sixth spacer element P6 placed on the image side of the sixth lens E6 and abutting against the image side of the sixth lens E6; and a seventh spacer element P7 placed on the image side of the seventh lens E7 and abutting against the image side of the seventh lens E7.

[0120] In addition, Table 7 shows the basic optical parameters of the optical imaging system of Embodiment 7, where the units of radius of curvature and thickness / distance are millimeters (mm).

[0121] Table 7

[0122]

[0123] In this embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the eighth lens E8 are aspherical, and the surface shape of each aspherical lens can be defined by the aspherical formula given in the above embodiment 1.

[0124] Tables 8 and 9 below show the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for each aspherical mirror S1 to S4 and S7 to S18 in Example 7.

[0125] Table 8

[0126]

[0127] Table 9

[0128]

[0129] Example 8

[0130] like Figure 12 As shown, in this embodiment, the optical imaging system includes a first lens barrel Pa and a second lens barrel Pb arranged sequentially along the optical axis, wherein the first lens barrel Pa includes a first lens E1 and a second lens E2; wherein the second lens barrel Pb includes a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8.

[0131] It is worth noting that, compared with Embodiment 7 above, the optical imaging system of Embodiment 8 has the same optical parameters, that is, the basic optical parameter table of the optical imaging system of Embodiment 8 is the same as Table 7, and the aspherical coefficient table is the same as Tables 8 and 9. However, the optical imaging system of Embodiment 8 has different structural parameters than the optical imaging system of Embodiment 7 above. That is, the difference between Embodiment 8 and Embodiment 7 is that the dimensional values ​​of some structural parameters of the lens barrel and multiple spacer elements in the optical imaging system are different. Specifically, the values ​​of each relevant structural parameter in Embodiment 8 are shown in Table 11 below.

[0132] Example 9

[0133] like Figure 13 As shown, in this embodiment, the optical imaging system includes a first lens barrel Pa and a second lens barrel Pb arranged sequentially along the optical axis, wherein the first lens barrel Pa includes a first lens E1 and a second lens E2; wherein the second lens barrel Pb includes a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8.

[0134] It is worth noting that, compared with Embodiment 7 above, the optical imaging system of Embodiment 9 has the same optical parameters, that is, the basic optical parameter table of the optical imaging system of Embodiment 9 is the same as Table 7, and the aspherical coefficient table is the same as Tables 8 and 9. However, the optical imaging system of Embodiment 9 has different structural parameters than the optical imaging system of Embodiment 7 above. That is, the difference between Embodiment 9 and Embodiment 7 is that the dimensional values ​​of some structural parameters of the lens barrel and multiple spacer elements in the optical imaging system are different. Specifically, the values ​​of each relevant structural parameter in Embodiment 9 are shown in Table 11 below.

[0135] The on-axis chromatic aberration curves of the optical imaging systems in Examples 7, 8, and 9 are as follows: Figure 14A As shown, this represents the degree of deviation of the focal point after light of different wavelengths passes through the optical imaging system; the astigmatism curves of the optical imaging systems in Examples 7, 8, and 9 are shown below. Figure 14B As shown, it represents the curvature of the meridional image plane and the curvature of the sagittal image plane; the distortion curves of the optical imaging systems in Examples 7, 8, and 9 are as follows. Figure 14C As shown, it represents the degree of distortion in the actual image; the magnification chromatic aberration curves of the optical imaging systems in Examples 7, 8, and 9 are shown below. Figure 14D As shown, this represents the degree of deviation of light of different wavelengths on the image plane after passing through an optical imaging system. According to... Figures 14A to 14D It can be seen that the optical imaging systems in Embodiments 7, 8 and 9 can all achieve good imaging quality.

[0136] In summary, in Embodiments 1 to 9, the effective focal lengths f1 to f8 of the first lens E1 to the eighth lens E8 in the optical imaging system, the effective focal length f of the optical imaging system, the combined effective focal length f12 of the first lens E1 and the second lens E2, the combined effective focal length f345 of the third lens E3 to the fifth lens E5, and the combined effective focal length f678 of the sixth lens E6 to the eighth lens E8 are shown in Table 10 below.

[0137] Table 10

[0138]

[0139] Furthermore, the structural parameters of the optical imaging system in Embodiments 1 to 9 include: the inner diameter d1s of the object side of the first spacer element, the inner diameter d1m of the image side of the first spacer element, the outer diameter D1m of the image side of the first spacer element, the inner diameter d3s of the object side of the third spacer element, the outer diameter D3s of the object side of the third spacer element, the inner diameter d4s of the object side of the fourth spacer element, the inner diameter d4m of the image side of the fourth spacer element, the inner diameter d5s of the object side of the fifth spacer element, the inner diameter d5m of the image side of the fifth spacer element, the inner diameter d6s of the object side of the sixth spacer element, the inner diameter d7m of the image side of the seventh spacer element, the outer diameter D7m of the image side of the fifth spacer element, the inner diameter das of the object side of the first lens barrel, the inner diameter dam of the image side of the first lens barrel, the outer diameter Das of the object side of the first lens barrel, and the outer diameter Das of the image side of the first lens barrel. The following parameters are considered: outer diameter Dam of the first lens barrel, inner diameter dbs of the object side of the second lens barrel, inner diameter dbm of the image side of the second lens barrel, outer diameter Dbs of the object side of the second lens barrel, outer diameter Dbm of the image side of the second lens barrel, maximum height La of the first lens barrel, maximum height Lb of the second lens barrel, distance EP01 between the object side of the first lens barrel and the object side of the first spacer element along the optical axis, distance EP34 between the image side of the third spacer element and the object side of the fourth spacer element along the optical axis, distance EP45 between the image side of the fourth spacer element and the object side of the fifth spacer element along the optical axis, maximum thickness CP5 of the fifth spacer element along the optical axis, distance EP56 between the image side of the fifth spacer element and the object side of the sixth spacer element along the optical axis, and distance EP67 between the image side of the sixth spacer element and the object side of the seventh spacer element along the optical axis. Specific data are shown in Table 11 below.

[0140] Table 11

[0141]

[0142] In summary, the optical imaging systems in Examples 1 to 9 satisfy the relationships shown in Table 12, as detailed in Table 12.

[0143] Table 12

[0144]

[0145] It is worth mentioning that, according to one aspect of this application, one embodiment of this application further provides a camera module, which may include the aforementioned optical imaging system and a photosensitive element, the photosensitive element being disposed on the image side of the optical imaging system for imaging. It is understood that the photosensitive element mentioned in this application may, but is not limited to, be implemented as a charge-coupled device (CCD) or a complementary metal oxide semiconductor (CMOS) device, and this application will not elaborate further on this.

[0146] Furthermore, according to another aspect of this application, one embodiment of this application provides an electronic device that may include a camera module and a processor as described above. The camera module is communicatively connected to the processor for acquiring image data and inputting the image data into the processor for processing. It is understood that the electronic device mentioned in this application may, but is not limited to, a device such as a mobile phone equipped with the camera module, and this application will not elaborate further on this.

[0147] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0148] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An optical imaging system, characterized in that, Along the optical axis, from the object side to the image side, it sequentially includes a first lens tube and a second lens tube; wherein... The first lens barrel sequentially includes: a first lens with positive optical power, the object side of the first lens being convex and the image side of the first lens being convex; a second lens with negative optical power; and a first spacer element disposed between the first lens and the second lens, wherein the first spacer element abuts against the image side of the first lens. The second lens barrel sequentially includes: a third lens with positive optical power, wherein the object-side surface of the third lens is convex and the image-side surface of the third lens is convex; a fourth lens with negative optical power, wherein the object-side surface of the fourth lens is convex and the image-side surface of the fourth lens is concave; a fifth lens with positive optical power, wherein the object-side surface of the fifth lens is convex and the image-side surface of the fifth lens is convex; a sixth lens with negative optical power, wherein the object-side surface of the sixth lens is concave and the image-side surface of the sixth lens is convex; a seventh lens with either positive or negative optical power; and an eighth lens with negative optical power, wherein the object-side surface of the eighth lens is convex and the image-side surface of the eighth lens is concave; in the third A third spacer element is provided between the lens and the fourth lens, and the third spacer element abuts against the image-side surface of the third lens; a fourth spacer element is provided between the fourth lens and the fifth lens, and the fourth spacer element abuts against the image-side surface of the fourth lens; a fifth spacer element is provided between the fifth lens and the sixth lens, and the fifth spacer element abuts against the image-side surface of the fifth lens; a sixth spacer element is provided between the sixth lens and the seventh lens, and the sixth spacer element abuts against the image-side surface of the sixth lens; a seventh spacer element is provided between the seventh lens and the eighth lens, and the seventh spacer element abuts against the image-side surface of the seventh lens. The optical imaging system has eight lenses; The optical imaging system satisfies: 3.40 < Lb / La < 4.70; 5.80 < f345 / (EP34+EP45) < 6.50; where Lb is the maximum height of the second lens barrel, La is the maximum height of the first lens barrel, f345 is the combined focal length of the third lens, the fourth lens and the fifth lens, 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, and EP45 is the distance from the image side of the fourth spacer element to the object side of the fifth spacer element along the optical axis.

2. The optical imaging system according to claim 1, characterized in that, The optical imaging system also satisfies: 16.15 < f12 / La < 20.75; where f12 is the combined focal length of the first lens and the second lens, and La is the maximum height of the first lens barrel.

3. The optical imaging system according to claim 1, characterized in that, The optical imaging system also satisfies: -6.60≤f678 / (EP56+EP67)≤-3.97; where f678 is the combined focal length of the sixth lens, the seventh lens and the eighth lens, 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.

4. The optical imaging system according to claim 1, characterized in that, The optical imaging system also satisfies: 4.95 < d1s / (CT1+CT2) < 5.50; where d1s is the inner diameter of the side of the first spacer element, CT1 is the center thickness of the first lens on the optical axis, and CT2 is the center thickness of the second lens on the optical axis.

5. The optical imaging system according to claim 1, characterized in that, The optical imaging system also satisfies: 1.43≤(Das-das) / EP01≤5.20; where Das is the outer diameter of the side of the first lens barrel, das is the inner diameter of the side of the first lens barrel, and EP01 is the distance from the side of the first lens barrel to the side of the first spacer element along the optical axis.

6. The optical imaging system according to claim 1, characterized in that, The optical imaging system also satisfies: 0.80 < (Dam - dam) / (D1m - d1m) < 2.20; where Dam is the outer diameter of the image side of the first lens barrel, dam is the inner diameter of the image side of the first lens barrel, D1m is the outer diameter of the image side of the first spacer element, and d1m is the inner diameter of the image side of the first spacer element.

7. The optical imaging system according to claim 1, characterized in that, The optical imaging system also satisfies: 3.54≤f3 / (D3s-d3s)≤6.10; where f3 is the effective focal length 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.

8. The optical imaging system according to claim 1, characterized in that, The optical imaging system also satisfies: 1.55≤(CP5+EP56) / (T56+CT6)≤1.96; where CP5 is the maximum thickness of the fifth spacer element along the optical axis, EP56 is the distance from the image side of the fifth spacer element to the object side of the sixth spacer element along the optical axis, T56 is the air gap between the fifth lens and the sixth lens on the optical axis, and CT6 is the center thickness of the sixth lens on the optical axis.

9. The optical imaging system according to claim 1, characterized in that, The optical imaging system also satisfies: 4.46≤(d4s+d4m) / R8≤4.95; where d4s is the inner diameter of the object side of the fourth spacer element, d4m is the inner diameter of the image side of the fourth spacer element, and R8 is the radius of curvature of the image side of the fourth lens.

10. The optical imaging system according to claim 1, characterized in that, The optical imaging system also satisfies: 0.50≤(Dbm-dbm) / (Dbs-dbs)≤5.58; where Dbm is the outer diameter of the image side of the second lens tube, dbm is the inner diameter of the image side of the second lens tube, Dbs is the outer diameter of the object side of the second lens tube, and dbs is the inner diameter of the object side of the second lens tube.

11. The optical imaging system according to claim 1, characterized in that, The optical imaging system also satisfies: 1.20≤(d5s+d5m) / f5≤1.71; where d5s is the inner diameter of the object side of the fifth spacer element, d5m is the inner diameter of the image side of the fifth spacer element, and f5 is the effective focal length of the fifth lens.

12. The optical imaging system according to claim 1, characterized in that, The optical imaging system also satisfies: 7.83≤d6s / T67≤17.88; where d6s is the inner diameter of the side of the sixth spacer element, and T67 is the air gap between the sixth lens and the seventh lens on the optical axis.

13. The optical imaging system according to claim 1, characterized in that, The optical imaging system also satisfies: 4.65≤D7m / (CT7+CT8)≤7.42; where D7m is the outer diameter of the image side of the seventh spacer element, CT7 is the center thickness of the seventh lens on the optical axis, and CT8 is the center thickness of the eighth lens on the optical axis.

14. The optical imaging system according to claim 1, characterized in that, The optical imaging system also satisfies: 0.86≤R15 / d7m≤1.66; where R15 is the radius of curvature of the object side of the eighth lens, and d7m is the inner diameter of the image side of the seventh spacer element.

Images