Optical image capturing system

Abstract

The utility model discloses an optical imaging system. The optical imaging system comprises a lens barrel, a lens group and a spacing element group, the lens group comprises a first lens, a second lens, a third lens and a sixth lens which are sequentially arranged from the object side to the image side along the optical axis, and the air interval between the second lens and the third lens on the optical axis is larger than that between any other adjacent lenses on the optical axis; the first to fifth spacer elements are disposed on image sides of the first to fifth lenses, respectively, and are in contact with image side surfaces of the first to fifth lenses, respectively. Half Semi-FOV of the maximum field angle of the optical imaging system, the outer diameter D0s of the object-side end face of the lens barrel, the outer diameter D0m of the image-side end face of the lens barrel, the effective focal length f2 of the second lens, the air interval T23 between the second lens and the third lens on the optical axis, and the distance EP12 from the first spacing element to the second spacing element on the optical axis meet the following conditions: 75 degree lt; the method comprises the following steps: carrying out half-FOVlt; the angle is 85 degrees, 1.2 lt; d0s / D0mlt; 2.5 and-8 lt; f2 / (T23-EP12) lt; and-4.

Description

Technical Field

[0001] This application relates to the field of optical elements, and more particularly, to an optical imaging system. Background Art

[0002] Compared with ordinary lenses, wide-angle lenses have a larger field of view angle. Therefore, wide-angle lenses are not only applied to mobile phone shooting to make the picture more hierarchical and three-dimensional, but also gradually applied in scenarios such as vehicle-mounted lenses and drones to help devices such as vehicles and drones perceive the surrounding environment. In a lens such as a drone obstacle avoidance lens, the lens needs to be as small as possible. On the one hand, it can make the whole machine more beautiful, and on the other hand, it can also reduce the weight. Therefore, for example, for a six-piece optical system that is widely used, developing a more compact optical system while ensuring optical performance and manufacturability has become an important topic for designers in this field. Summary of the Utility Model

[0003] This application provides an optical imaging system, which may include a lens barrel and a lens group and a spacer element group accommodated in the lens barrel. Among them, the lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in sequence from the object side to the image side along the optical axis; among them, the air gap between the second lens and the third lens on the optical axis is greater than the air gap between any other adjacent lenses on the optical axis; the spacer element group includes: a first spacer element, located on the image side of the first lens and at least partially in contact with the image side surface of the first lens; a second spacer element, located on the image side of the second lens and at least partially in contact with the image side surface of the second lens; a third spacer element, located on the image side of the third lens and at least partially in contact with the image side surface of the third lens; a fourth spacer element, located on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens; and a fifth spacer element, located on the image side of the fifth lens and at least partially in contact with the image side surface of the fifth lens; the optical imaging system satisfies: 75° < Semi-FOV < 85°, 1.2 < D0s / D0m < 2.5, and -8 < f2 / (T23 - EP12) < -4, where Semi-FOV is half of the maximum field of view angle of the optical imaging system, D0s is the outer diameter of the object-side end face of the lens barrel, D0m is the outer diameter of the image-side end face of the lens barrel, f2 is the effective focal length of the second lens, T23 is the air gap between the second lens and the third lens on the optical axis, and EP12 is the distance on the optical axis from the first spacer element to the second spacer element.

[0004] In one embodiment, the distance EP01 on the optical axis from the object-side end face of the lens barrel to the object-side surface of the first spacer element and the central thickness CT1 of the first lens on the optical axis satisfy: 1 < EP01 / CT1 < 3.

[0005] In one embodiment, the effective focal length f1 of the first lens, the effective focal length f of the optical imaging system, and the inner diameter d1s of the object-side surface of the first spacer element satisfy: -6 < f1 / f < -2.8 and -2.5 < f1 / d1s < -0.5.

[0006] In one embodiment, the combined focal length f23 of the second lens and the third lens and the distance EP23 on the optical axis from the second spacer element to the third spacer element satisfy: 7.5 < f23 / EP23 < 12.

[0007] In one embodiment, the outer diameter D2s of the object-side surface of the second spacer element, the inner diameter d2s of the object-side surface of the second spacer element, and the curvature radius R3 of the object-side surface of the second lens satisfy: -3 < D2s / f2 < -0.3 and 0.3 < d2s / R3 < 3.5.

[0008] In one embodiment, the central thickness CT3 of the third lens on the optical axis and the thickness CP3 of the third spacer element satisfy: 1 < CT3 / CP3 < 2.2.

[0009] In one embodiment, the effective focal length f3 of the third lens, the thickness CP3 of the third spacer element, and the refractive index N3 of the third lens satisfy: 6 < f3 / CP3 × N3 < 12.

[0010] In one embodiment, the outer diameter D2m of the image-side surface of the second spacer element, the curvature radius R5 of the object-side surface of the third lens, the curvature radius R6 of the image-side surface of the third lens, and the outer diameter D3s of the object-side surface of the third spacer element satisfy: -2.5 < D2m / R5 < 1.3 and -1.5 < R6 / D3s < 0.

[0011] In one embodiment, the distance EP45 on the optical axis from the fourth spacer element to the fifth spacer element and the distance EP34 on the optical axis from the third spacer element to the fourth spacer element satisfy: 1 < EP45 / EP34 < 2.

[0012] In one embodiment, the outer diameter D3m of the image side surface of the third spacer element, the outer diameter D4m of the image side surface of the fourth spacer element, the distance EP34 between the third spacer element and the fourth spacer element on the optical axis, and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy: 0.5 < D3m / D4m < 1 and 0.5 < EP34 / T34 < 2.

[0013] In one embodiment, the air gap T45 between the fourth lens and the fifth lens on the optical axis, the thickness CP4 of the fourth spacer element, and the thickness CP5 of the fifth spacer element satisfy: 0 < T45 / (CP4 + CP5) < 2.

[0014] In one embodiment, the spacer element group further includes: a third auxiliary spacer element, located on the image side of the third spacer element and at least partially in contact with the image side surface of the third spacer element; the effective focal length f3 of the third lens, the inner diameter d3bs of the object side surface of the third auxiliary spacer element, the effective focal length f4 of the fourth lens, and the outer diameter D3bm of the image side surface of the third auxiliary spacer element satisfy: 2.2 < f3 / d3bs < 2.9 and 0.2 < f4 / D3bm < 0.6.

[0015] In one embodiment, the inner diameter d5s of the object side surface of the fifth spacer element, the outer diameter D5s of the object side surface of the fifth spacer element, and the effective focal length f5 of the fifth lens satisfy: -4 < (d5s + D5s) / f5 < -2.8.

[0016] In one embodiment, the axial distance SAG22 from the intersection of the image side surface of the second lens and the optical axis to the vertex of the effective radius of the image side surface of the second lens and the distance EP23 between the second spacer element and the third spacer element on the optical axis satisfy: 0.72 ≤ SAG22 / EP23 < 1.5.

[0017] In one embodiment, both the inner diameter value of the object side surface and the outer diameter value of the image side surface of the first spacer element to the third spacer element show a decreasing trend.

[0018] The optical imaging system according to an embodiment of the present application includes a lens barrel, a six-piece lens group, and a spacer element group accommodated in the lens barrel. The first lens to the sixth lens are arranged in sequence from the object side to the image side along the optical axis. Among them, the air gap between the second lens and the third lens on the optical axis is greater than the air gap between any other adjacent lenses on the optical axis; the spacer element group includes: a first spacer element located on the image side of the first lens and at least partially in contact with the image side surface of the first lens, a second spacer element located on the image side of the second lens and at least partially in contact with the image side surface of the second lens, a third spacer element located on the image side of the third lens and at least partially in contact with the image side surface of the third lens, a fourth spacer element located on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens, and a fifth spacer element located on the image side of the fifth lens and at least partially in contact with the image side surface of the fifth lens; and, on the premise that half of the maximum field of view angle Semi-FOV of the optical imaging system satisfies the conditional formula 75° < Semi-FOV < 85°, control the outer diameter D0s of the object-side end face of the lens barrel and the outer diameter D0m of the image-side end face of the lens barrel to satisfy the conditional formula 1.2 < D0s / D0m < 2.5. At the same time, control the effective focal length f2 of the second lens, the air gap T23 between the second lens and the third lens on the optical axis, and the distance EP12 between the first spacer element and the second spacer element on the optical axis to satisfy the conditional formula -8 < f2 / (T23 - EP12) < -4. By adjusting 1.2 < D0s / D0m < 2.5 and -8 < f2 / (T23 - EP12) < -4, the outer diameters of the object-side surface and the image-side surface of the lens barrel are controlled. On the one hand, the overall size of the lens barrel is restricted, and the wall thickness of the lens barrel is kept uniform, which is beneficial to the processing and forming of the lens barrel; on the other hand, the outer diameter of the first lens is indirectly controlled. On the premise of not blocking the effective light and ensuring sufficient processing and assembly suction positions for the first lens, the outer diameter is as small as possible to weaken the misalignment amount when the first, second, and third lenses are assembled, improve the assembly stability, and weaken the adverse effects brought by the relatively steep trend of light rays in the first, second, and third lenses when 75° < Semi-FOV < 85°. Controlling the effective focal length, edge thickness of the second lens, and the air gap between the second lens and the third lens on the optical axis helps to control the overall shape of the second lens and improve the forming processability of the second lens. Description of the Drawings

[0019] In combination with the drawings, through the following detailed description of non-limiting embodiments, other features, objectives, and advantages of the present application will become more obvious. In the drawings:

[0020] Figure 1 The structure and related parameter schematic diagram of the optical imaging system according to an exemplary embodiment of the present application are shown;

[0021] Figure 2 The structural schematic diagram of the optical imaging system according to Embodiment 1 of the present application is shown;

[0022] Figure 3 A schematic structural diagram of an optical imaging system according to Embodiment 2 of the present application is shown;

[0023] Figure 4 A schematic structural diagram of an optical imaging system according to Embodiment 3 of the present application is shown;

[0024] Figures 5 to 8 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging system according to Embodiment 1, Embodiment 2 and Embodiment 3 of the present application are shown;

[0025] Fig. 9 A schematic structural diagram of an optical imaging system according to Embodiment 4 of the present application is shown;

[0026] Fig.10 A schematic structural diagram of an optical imaging system according to Embodiment 5 of the present application is shown;

[0027] Fig.11 A schematic structural diagram of an optical imaging system according to Embodiment 6 of the present application is shown;

[0028] Figures 12 to 15 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging system according to Embodiment 4, Embodiment 5 and Embodiment 6 of the present application are shown;

[0029] Fig.16 A schematic structural diagram of an optical imaging system according to Embodiment 7 of the present application is shown;

[0030] Fig.17 A schematic structural diagram of an optical imaging system according to Embodiment 8 of the present application is shown;

[0031] Fig.18 A schematic diagram of the structure of an optical imaging system according to Embodiment 9 of the present application is shown; and

[0032] Figures 19 to 22 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging system according to Embodiment 7, Embodiment 8 and Embodiment 9 of the present application are shown;

[0033] Fig.23 The MTF diagram of the optical imaging system is shown when the optical imaging system satisfies the conditional formula Semi-FOV=80° and D0s / D0m=1.85 and the conditional formula f2 / (T23-EP12)=-6.75 at the same time;

[0034] Fig.24The MTF diagram of the optical imaging system is shown when the optical imaging system satisfies the conditional formula Semi-FOV=80° and D0s / D0m=2.1 and the conditional formula f2 / (T23-EP12)=-5.43 at the same time;

[0035] Fig.25 shows the MTF diagram of the optical imaging system when the optical imaging system satisfies the conditional formula Semi-FOV=70° and D0s / D0m=-8 and the conditional formula f2 / (T23-EP12)=-22; and

[0036] Fig.26 The MTF diagram of the optical imaging system is shown when the optical imaging system satisfies the conditional equations Semi-FOV=60° and D0s / D0m=10 and simultaneously satisfies the conditional equation f2 / (T23-EP12)=12. DETAILED DESCRIPTION

[0037] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and are not intended to limit the scope of the present 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.

[0038] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0039] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0040] In this article, the paraxial area refers to the area near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial area; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial area. The judgment of the surface type in the paraxial area can be judged according to the general method in this field, for example, the positive and negative R value (R refers to the radius of curvature of the paraxial area) is used to judge the concave and convex. In this article, the surface of each lens closest to the subject is called the object side of the lens, and the surface of each lens closest to the imaging surface is called the image side of the lens. For the object side, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; for the image side, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface.

[0041] It should also be understood that the terms "comprises", "including", "having", "includes" 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. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0042] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0043] It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The following embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can also be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0044] The features, principles and other aspects of the present application are described in detail below.

[0045] An optical imaging system according to an exemplary embodiment of the present application may include a lens barrel and a lens group and a spacer element group accommodated in the lens barrel. The lens group may be a six-piece lens group, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in sequence from the object side to the image side along the optical axis.

[0046] In an exemplary embodiment, the air gap between the second lens and the third lens on the optical axis is greater than the air gaps between any other adjacent lenses on the optical axis. That is, among the air gaps between any two adjacent lenses of the first to sixth lenses on the optical axis, the air gap between the second lens and the third lens on the optical axis is the largest.

[0047] In an exemplary embodiment, the spacer element group in the optical imaging system may include: a first spacer element located on the image side of the first lens and at least partially in contact with the image side surface of the first lens; a second spacer element located on the image side of the second lens and at least partially in contact with the image side surface of the second lens; a third spacer element located on the image side of the third lens and at least partially in contact with the image side surface of the third lens; a fourth spacer element located on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens; and a fifth spacer element located on the image side of the fifth lens and at least partially in contact with the image side surface of the fifth lens.

[0048] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 75° < Semi-FOV < 85°, where Semi-FOV is half of the maximum field of view angle of the optical imaging system.

[0049] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 1.2 < D0s / D0m < 2.5, where D0s is the outer diameter of the object-side end face of the lens barrel (i.e., the end face or surface of the lens barrel closest to the object side), and D0m is the outer diameter of the image-side end face of the lens barrel (i.e., the end face or surface of the lens barrel closest to the image side).

[0050] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula -8 < f2 / (T23 - EP12) < -4, where f2 is the effective focal length of the second lens; T23 is the air gap between the second lens and the third lens on the optical axis, that is, the distance on the optical axis from the image side surface of the second lens to the object side surface of the third lens; and EP12 is the distance on the optical axis from the first spacer element to the second spacer element, that is, the distance on the optical axis from the image side surface of the first spacer element to the object side surface of the second spacer element.

[0051] An optical imaging system according to an embodiment of the present application includes a lens barrel, a six-piece lens group and a spacer element group accommodated in the lens barrel. The first lens to the sixth lens are arranged in sequence from the object side to the image side along the optical axis. Among them, the air gap between the second lens and the third lens on the optical axis is greater than the air gap between any other adjacent lenses on the optical axis; the spacer element group includes: a first spacer element located on the image side of the first lens and at least partially in contact with the image side surface of the first lens, a second spacer element located on the image side of the second lens and at least partially in contact with the image side surface of the second lens, a third spacer element located on the image side of the third lens and at least partially in contact with the image side surface of the third lens, a fourth spacer element located on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens, and a fifth spacer element located on the image side of the fifth lens and at least partially in contact with the image side surface of the fifth lens; and, on the premise that half of the maximum field of view angle Semi-FOV of the optical imaging system satisfies the conditional formula 75° < Semi-FOV < 85°, control the outer diameter D0s of the object-side end face of the lens barrel and the outer diameter D0m of the image-side end face of the lens barrel to satisfy the conditional formula 1.2 < D0s / D0m < 2.5, and at the same time control the effective focal length f2 of the second lens, the air gap T23 between the second lens and the third lens on the optical axis, and the distance EP12 between the first spacer element and the second spacer element on the optical axis to satisfy the conditional formula -8 < f2 / (T23 - EP12) < -4. By adjusting 1.2 < D0s / D0m < 2.5 and -8 < f2 / (T23 - EP12) < -4, the outer diameters of the object-side surface and the image-side surface of the lens barrel are controlled. On the one hand, the overall size of the lens barrel is restricted, and the wall thickness of the lens barrel is kept uniform, which is beneficial to the processing and forming of the lens barrel; on the other hand, the outer diameter of the first lens is indirectly controlled. On the premise of not blocking the effective light and ensuring sufficient processing and assembly suction positions of the first lens, the outer diameter is as small as possible to weaken the misalignment amount when the first, second, and third lenses are assembled, improve the assembly stability, and weaken the adverse effects brought by the relatively steep trend of light rays in the first, second, and third lenses when 75° < Semi-FOV < 85°. Controlling the effective focal length, edge thickness of the second lens, and the air gap between the second lens and the third lens on the optical axis helps to control the overall shape of the second lens and improve the forming processability of the second lens.

[0052] See appendix Figure 23 to Figure 26 , wherein, Fig.23 shows the MTF (modulation transfer function) diagram of the optical imaging system when the conditional formula Semi-FOV = 80° and D0s / D0m = 1.85 are satisfied and at the same time the conditional formula f2 / (T23 - EP12) = -6.75 is satisfied; Fig.24 shows the MTF diagram of the optical imaging system when the conditional formula Semi-FOV = 80° and D0s / D0m = 2.1 are satisfied and at the same time the conditional formula f2 / (T23 - EP12) = -5.43 is satisfied; Fig.25 shows the MTF graph of the optical imaging system when the conditions Semi - FOV = 70° and D0s / D0m = - 8 are satisfied, and at the same time the condition f2 / (T23 - EP12) = - 22 is satisfied; Fig.26 shows the MTF graph of the optical imaging system when the conditions Semi - FOV = 60° and D0s / D0m = 10 are satisfied, and at the same time the condition f2 / (T23 - EP12) = 12 is satisfied. Comparing Figure 23-26 the several cases shown, when the value of the semi - field - of - view angle Semi - FOV of the optical imaging system is in the range greater than 75° and less than 85°, the value of the condition D0s / D0m is in the range greater than 1.2 and less than 2.5, and at the same time the value of the condition f2 / (T23 - EP12) is in the range greater than - 8 and less than - 4, as Fig.23 and Fig.24 can be seen from the MTF graphs of the system shown, the system has better optical performance; while when the value of the semi - field - of - view angle Semi - FOV is in the range less than or equal to 75° or greater than or equal to 85°, the value of the condition D0s / D0m is in the range less than or equal to 1.2 or greater than or equal to 2.5, and the value of f2 / (T23 - EP12) is in the range less than or equal to - 8 or greater than or equal to - 4, as Fig.25 and Fig.26 can be seen from the MTF graphs of the system shown, the optical performance of the system is relatively poor at this time. Therefore, for the optical imaging system according to the embodiments of the present application, on the premise that the half of the maximum field - of - view angle Semi - FOV is controlled to satisfy 75° < Semi - FOV < 85°, by controlling the outer diameter D0s of the object - side end face of the lens barrel and the outer diameter D0m of the image - side end face of the lens barrel to satisfy the condition 1.2 < D0s / D0m < 2.5, and at the same time controlling the effective focal length f2 of the second lens, the air space T23 between the second lens and the third lens on the optical axis and the distance EP12 from the first spacer element to the second spacer element on the optical axis to satisfy the condition - 8 < f2 / (T23 - EP12) < - 4, it is beneficial to improve the assembly stability and enhance the optical performance of the system.

[0053] In an exemplary embodiment, the first lens may have a negative optical power, its object side surface may be convex, and its image side surface may be concave. The second lens may have a negative optical power, its object side surface may be convex, and its image side surface may be concave. The third lens may have a positive optical power, its image side surface may be convex. The fourth lens may have a positive optical power, its object side surface may be convex, and its image side surface may be convex. The fifth lens may have a negative optical power, its object side surface may be concave, and its image side surface may be concave. The sixth lens may have a positive optical power, its object side surface may be convex.

[0054] In an exemplary embodiment, the spacer element group of the optical imaging system may further include: a third auxiliary spacer element, located on the image side of the third spacer element and at least partially in contact with the image side surface of the third spacer element.

[0055] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 1 < EP01 / CT1 < 3, where EP01 is the distance on the optical axis from the object-side end face of the lens barrel to the object-side surface of the first spacer element, and CT1 is the central thickness of the first lens on the optical axis. By controlling the ratio of the distance on the optical axis from the object-side end face of the lens barrel to the object-side surface of the first spacer element to the central thickness of the first lens within this range, on the one hand, the position of the object-side end face of the lens barrel can be controlled to ensure that the object-side end face of the lens barrel does not block the effective light for imaging; on the other hand, the edge thickness of the first lens can be restricted to ensure the processability of the first lens.

[0056] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula -6 < f1 / f < -2.8, and on this premise, simultaneously satisfy the conditional formula -2.5 < f1 / d1s < -0.5, where f1 is the effective focal length of the first lens, f is the effective focal length of the optical imaging system, and d1s is the inner diameter of the object-side surface of the first spacer element. By controlling the ratio of the effective focal length of the first lens to the effective focal length of the optical imaging system and the ratio of the effective focal length of the first lens to the inner diameter of the object-side surface of the first spacer element to satisfy the above ranges respectively, the effective focal length of the first lens can be reasonably controlled, the overall shape of the first lens can be restricted, which is helpful for the processing of the first lens; by reasonably controlling the inner diameter of the object-side surface of the first spacer element, excess light can be blocked from entering the rear lens mechanism part to generate stray light, so as to ensure the imaging quality.

[0057] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 7.5 < f23 / EP23 < 12, where f23 is the combined focal length of the second lens and the third lens, and EP23 is the distance on the optical axis from the second spacer element to the third spacer element, that is, the distance on the optical axis from the image-side surface of the second spacer element to the object-side surface of the third spacer element. By controlling the ratio of the combined focal length of the second lens and the third lens to the distance on the optical axis from the second spacer element to the third spacer element within this range, the combined focal length of the second and third lenses can be reasonably controlled, which is beneficial to controlling the light path in the second and third lenses, and can also control the contribution amount of the aberration of the two lenses, and balance with the aberration generated by the rear optical elements, so that the aberration of the optical system is at a reasonable level; by reasonably controlling the distance on the optical axis from the second spacer element to the third spacer element, the edge thickness of the third lens can be restricted to ensure a suitable thickness ratio, which is beneficial to the processing and forming of the third lens.

[0058] In an exemplary embodiment, the optical imaging system of the present application can satisfy the conditional formula -3 < D2s / f2 < -0.3. On this premise, the conditional formula 0.3 < d2s / R3 < 3.5 is satisfied at the same time, where D2s is the outer diameter of the object side of the second spacer element, f2 is the effective focal length of the second lens, d2s is the inner diameter of the object side of the second spacer element, and R3 is the radius of curvature of the object side of the second lens. By controlling the ratio of the outer diameter of the object side of the second spacer element to the effective focal length of the second lens and the ratio of the inner diameter of the object side of the second spacer element to the radius of curvature of the object side of the second lens to satisfy the above conditions respectively, the radius of curvature of the object side of the second lens can be reasonably controlled, the shape of the object side of the second lens can be ensured, which is beneficial to the processing of the lens. At the same time, the distance from the image side of the first lens can be ensured to avoid interference problems during the assembly process; by reasonably controlling the inner diameter of the object side of the second spacer element, it is beneficial to block excess light and avoid stray light affecting imaging.

[0059] In an exemplary embodiment, the optical imaging system of the present application can satisfy the conditional formula 1 < CT3 / CP3 < 2.2, where CT3 is the central thickness of the third lens on the optical axis, and CP3 is the thickness of the third spacer element, that is, the thickness or maximum thickness of the third spacer element in the direction along or parallel to the optical axis. By controlling the ratio of the central thickness of the third lens on the optical axis to the thickness of the third spacer element within this range, the edge thickness of the third lens and the thickness of the third spacer element are reasonably allocated, so that the third lens has a suitable thickness ratio for molding and the third spacer element has a suitable thickness, improving the processability of the third lens and the third spacer element.

[0060] In an exemplary embodiment, the optical imaging system of the present application can satisfy the conditional formula 6 < f3 / CP3×N3 < 12, where f3 is the effective focal length of the third lens, CP3 is the thickness of the third spacer element, and N3 is the refractive index of the third lens. By controlling the effective focal length of the third lens, the thickness of the third spacer element, and the refractive index of the third lens to satisfy 6 < f3 / CP3×N3 < 12, on the one hand, controlling the effective focal length and refractive index of the third lens helps to control the path of light in the third lens. On the other hand, by controlling the thickness of the third spacer element, while ensuring that the third spacer element is beneficial to processing, the edge thickness of the third lens is indirectly controlled, which is beneficial to the final processing and molding of the third lens and the third spacer element.

[0061] In an exemplary embodiment, the optical imaging system of the present application can satisfy the conditional formula -2.5 < D2m / R5 < 1.3. On this premise, the conditional formula -1.5 < R6 / D3s < 0 is satisfied at the same time, where D2m is the outer diameter of the image side of the second spacer element, R5 is the curvature radius of the object side of the third lens, R6 is the curvature radius of the image side of the third lens, and D3s is the outer diameter of the object side of the third spacer element. By controlling the ratio of the outer diameter of the image side of the second spacer element to the curvature radius of the object side of the third lens, and controlling the ratio of the curvature radius of the image side of the third lens to the outer diameter of the object side of the third spacer element to satisfy the above conditions respectively, the shapes of the object side and the image side of the third lens are constrained, which is beneficial to the processing of the third lens. By controlling the outer diameter of the image side of the second spacer element and the outer diameter of the object side of the third spacer element, the assembly stability of the second and third lenses is ensured.

[0062] In an exemplary embodiment, the optical imaging system of the present application can satisfy the conditional formula 1 < EP45 / EP34 < 2, where EP45 is the distance between the fourth spacer element and the fifth spacer element on the optical axis, that is, the distance between the image side of the fourth spacer element and the object side of the fifth spacer element on the optical axis; EP34 is the distance between the third spacer element and the fourth spacer element on the optical axis, that is, the distance between the image side of the third spacer element and the object side of the fourth spacer element on the optical axis. By controlling the ratio of the distance between the fourth spacer element and the fifth spacer element on the optical axis to the distance between the third spacer element and the fourth spacer element on the optical axis within this range, the edge thicknesses of the fourth lens and the fifth lens can be constrained. On the premise that all effective light rays can pass through the effective diameters of the fourth and fifth lenses for imaging, the processability of the fourth and fifth lenses is ensured.

[0063] In an exemplary embodiment, the optical imaging system of the present application can satisfy the conditional formulas 0.5 < D3m / D4m < 1 and 0.5 < EP34 / T34 < 2, where D3m is the outer diameter of the image side of the third spacer element, D4m is the outer diameter of the image side of the fourth spacer element, EP34 is the distance between the third spacer element and the fourth spacer element on the optical axis, and T34 is the air gap between the third lens and the fourth lens on the optical axis, that is, the distance between the image side of the third lens and the object side of the fourth lens on the optical axis. By controlling the ratio of the outer diameter of the image side of the third spacer element to the outer diameter of the image side of the fourth spacer element, and the ratio of the distance between the third spacer element and the fourth spacer element on the optical axis to the air gap between the third lens and the fourth lens on the optical axis to satisfy the above conditions respectively, the edge thickness of the fourth lens and the position of the auxiliary spacer element are indirectly constrained, the processability of the fourth lens is ensured, and at the same time, since the auxiliary spacer element is the aperture stop, ensuring its position is beneficial to ensuring the chief ray angle and relative illumination of the lens.

[0064] In an exemplary embodiment, the optical imaging system of the present application can satisfy the conditional expression 0 < T45 / (CP4 + CP5) < 2, where T45 is the air gap between the fourth lens and the fifth lens on the optical axis; CP4 is the thickness of the fourth spacer element, that is, the thickness or maximum thickness of the fourth spacer element in the direction along or parallel to the optical axis; CP5 is the thickness of the fifth spacer element, that is, the thickness or maximum thickness of the fifth spacer element in the direction along or parallel to the optical axis. By controlling that the air gap between the fourth lens and the fifth lens on the optical axis, the thickness of the fourth spacer element, and the thickness of the fifth spacer element satisfy 0 < T45 / (CP4 + CP5) < 2, the air gap between the fourth lens and the fifth lens on the optical axis is small. By controlling the thicknesses of the fourth and fifth spacer elements, on the one hand, it can ensure that there is no interference problem between the fourth lens and the fifth lens, and on the other hand, it indirectly restricts the edge thickness of the fifth lens to ensure an appropriate thickness ratio to meet the requirements of processability.

[0065] In an exemplary embodiment, the optical imaging system of the present application can satisfy the conditional expressions 2.2 < f3 / d3bs < 2.9 and 0.2 < f4 / D3bm < 0.6, where f3 is the effective focal length of the third lens, d3bs is the inner diameter of the object side surface of the third auxiliary spacer element, f4 is the effective focal length of the fourth lens, and D3bm is the outer diameter of the image side surface of the third auxiliary spacer element. By controlling that the ratio of the effective focal length of the third lens to the inner diameter of the object side surface of the third auxiliary spacer element, and the ratio of the effective focal length of the fourth lens to the outer diameter of the image side surface of the third auxiliary spacer element respectively satisfy the above conditions, the effective focal lengths of the third and fourth lenses are reasonably controlled, and the overall shapes of the third and fourth lenses are restricted, which is beneficial to controlling the light path between the third and fourth lenses; by controlling the outer diameter of the image side surface of the auxiliary spacer element, its supporting effect on the third spacer element is ensured, and at the same time, by restricting the inner diameter of the object side surface of the auxiliary spacer element, it helps to block the stray light generated by the excess light.

[0066] In an exemplary embodiment, the optical imaging system of the present application can satisfy the conditional expression -4 < (d5s + D5s) / f5 < -2.8, where d5s is the inner diameter of the object side surface of the fifth spacer element, D5s is the outer diameter of the object side surface of the fifth spacer element, and f5 is the effective focal length of the fifth lens. By controlling that the inner diameter of the object side surface of the fifth spacer element, the outer diameter of the object side surface of the fifth spacer element, and the effective focal length of the fifth lens satisfy the conditional expression -4 < (d5s + D5s) / f5 < -2.8, the effective focal length of the fifth lens is reasonably controlled, the deflection angle of the marginal field of view in the fifth lens can be restricted, and the sensitivity of the system can be reduced; by reasonably controlling the inner and outer diameters of the object side surface of the fifth spacer element, on the premise of ensuring the supporting property of the fifth spacer element for the lens, the generation of stray light can be effectively reduced, and the imaging quality of the lens can be improved.

[0067] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 0.72≤SAG22 / EP23<1.5, wherein SAG22 is the on-axis distance from the intersection of the image side surface of the second lens and the optical axis to the vertex of the effective radius of the image side surface of the second lens, and EP23 is the distance from the second spacer element to the third spacer element on the optical axis, that is, the distance from the image side surface of the second spacer element to the object side surface of the third spacer element on the optical axis. By controlling the ratio of the on-axis distance from the intersection of the image side surface of the second lens and the optical axis to the vertex of the effective radius of the image side surface of the second lens to the distance from the second spacer element to the third spacer element on the optical axis within this range, the thickness of the second spacer element and the edge thickness of the third lens are reasonably distributed, that is, the reasonable thickness of the second spacer element and the appropriate thickness ratio of the third lens are ensured, which is helpful for the processing of the second spacer element and the third lens.

[0068] In an exemplary embodiment, according to the optical imaging system of the present application, the inner diameter values ​​of the object side surface and the outer diameter values ​​of the image side surface of the first to third spacing elements are all in a decreasing trend. That is, the inner diameter d1s of the object side surface of the first spacing element, the inner diameter d2s of the object side surface of the second spacing element, and the inner diameter d3s of the object side surface of the third spacing element satisfy: d1s>d2s>d3s; the outer diameter D1m of the image side surface of the first spacing element, the outer diameter D2m of the image side surface of the second spacing element, and the outer diameter D3m of the image side surface of the third spacing element satisfy: D1m>D2m>D3m. The decreasing trend of the inner diameter values ​​of the object side surface of the first to third spacing elements is determined by the trend of light. The inner diameter of the object side surface of the spacing element is as close to the edge of the effective light as possible, which can avoid the generation of stray light while ensuring that the optical main value meets the specification requirements. The decreasing trend of the image side outer diameter values ​​of the first to third spacing elements is mainly for assembly considerations. In the exemplary embodiment, the assembly order of the first to third lenses is: the third lens, the second lens, the first lens, corresponding to the third spacing element, the second spacing element and the first spacing element respectively. In order to avoid the flash on the lens parting surface, the step difference is retained between adjacent lenses, so that the outer diameters of the first to third lenses meet the condition of "first lens> second lens> third lens", and the image side outer diameter values ​​of the corresponding first to third spacing elements are decreasing.

[0069] In an exemplary embodiment, the optical imaging system of the present application may include at least one aperture. The aperture may constrain the optical path and control the light intensity. The aperture may be set at an appropriate position of the optical imaging system, for example, the aperture may be set between the third lens and the fourth lens.

[0070] In an exemplary embodiment, optionally, the optical imaging system may further include a filter for correcting color deviation and / or a protective glass for protecting a photosensitive element located on the imaging surface.

[0071] In an exemplary embodiment, one or more aspherical surfaces may be provided on the surfaces of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens. The aspherical surface has better curvature radius characteristics and has the advantages of improving distortion aberration and astigmatism aberration. By using the aspherical surface, it is possible to eliminate the aberration that occurs during imaging as much as possible, thereby improving the imaging quality.

[0072] The optical imaging system according to an embodiment of the present application includes a lens barrel and a six-lens group and a spacer element group accommodated in the lens barrel. The first lens to the sixth lens are arranged in order from the object side to the image side along the optical axis. Among them, the air gap between the second lens and the third lens on the optical axis is greater than the air gap between any other adjacent lenses on the optical axis; the spacer element group includes: a first spacer element located on the image side of the first lens and at least partially in contact with the image side surface of the first lens, a second spacer element located on the image side of the second lens and at least partially in contact with the image side surface of the second lens, a third spacer element located on the image side of the third lens and at least partially in contact with the image side surface of the third lens, a fourth spacer element located on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens, and a fifth spacer element located on the image side of the fifth lens and at least partially in contact with the image side surface of the fifth lens; and, on the premise that half of the maximum field of view angle Semi-FOV of the optical imaging system satisfies the conditional formula 75° < Semi-FOV < 85°, control the outer diameter D0s of the object-side end face of the lens barrel and the outer diameter D0m of the image-side end face of the lens barrel to satisfy the conditional formula 1.2 < D0s / D0m < 2.5. At the same time, control the effective focal length f2 of the second lens, the air gap T23 between the second lens and the third lens on the optical axis, and the distance EP12 between the first spacer element and the second spacer element on the optical axis to satisfy the conditional formula -8 < f2 / (T23 - EP12) < -4. By adjusting 1.2 < D0s / D0m < 2.5 and -8 < f2 / (T23 - EP12) < -4, the outer diameters of the object-side surface and the image-side surface of the lens barrel are controlled. On the one hand, the overall size of the lens barrel is restricted, and the wall thickness of the lens barrel is kept uniform, which is beneficial to the processing and forming of the lens barrel; on the other hand, the outer diameter of the first lens is indirectly controlled. On the premise of not blocking the effective light and ensuring sufficient processing and assembly suction positions for the first lens, the outer diameter is as small as possible to weaken the misalignment amount when the first, second, and third lenses are assembled, improve the assembly stability, and weaken the adverse effects brought by the relatively steep trend of light rays in the first, second, and third lenses when 75 < Semi-FOV < 85. Controlling the effective focal length, edge thickness of the second lens, and the air gap between the second lens and the third lens on the optical axis helps to control the overall shape of the second lens and improve the forming processability of the second lens.

[0073] On the other hand, the optical imaging system according to an embodiment of the present application includes a lens barrel, a six-piece lens group and a spacer element group accommodated in the lens barrel. The first lens to the sixth lens are arranged in sequence from the object side to the image side along the optical axis. Among them, the air gap between the second lens and the third lens on the optical axis is greater than the air gaps between any other adjacent lenses on the optical axis; the spacer element group includes: a first spacer element located on the image side of the first lens and at least partially in contact with the image side surface of the first lens, a second spacer element located on the image side of the second lens and at least partially in contact with the image side surface of the second lens, a third spacer element located on the image side of the third lens and at least partially in contact with the image side surface of the third lens, a fourth spacer element located on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens, and a fifth spacer element located on the image side of the fifth lens and at least partially in contact with the image side surface of the fifth lens; and, controlling the combined focal length f23 of the second lens and the third lens and the distance EP23 between the second spacer element and the third spacer element on the optical axis to satisfy the conditional formula 7.5 < f23 / EP23 < 12 is beneficial to controlling the light path in the second and third lenses, and can also control the contribution of the aberration of the two lenses, balance the aberration generated by the rear optical elements, and make the aberration of the optical system at a reasonable level; at the same time, the edge thickness of the third lens can be restricted to ensure a suitable thickness ratio, which is beneficial to the processing and forming of the third lens.

[0074] On the other hand, the optical imaging system according to an embodiment of the present application includes a lens barrel, a six-piece lens group and a spacer element group accommodated in the lens barrel. The first lens to the sixth lens are arranged in sequence from the object side to the image side along the optical axis. Among them, the air gap between the second lens and the third lens on the optical axis is greater than the air gaps between any other adjacent lenses on the optical axis; the spacer element group includes: a first spacer element located on the image side of the first lens and at least partially in contact with the image side surface of the first lens, a second spacer element located on the image side of the second lens and at least partially in contact with the image side surface of the second lens, a third spacer element located on the image side of the third lens and at least partially in contact with the image side surface of the third lens, a fourth spacer element located on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens, and a fifth spacer element located on the image side of the fifth lens and at least partially in contact with the image side surface of the fifth lens; and, controlling the outer diameter D2m of the image side surface of the second spacer element and the curvature radius R5 of the object side surface of the third lens to satisfy the conditional formula -2.5 < D2m / R5 < 1.3. On this premise, at the same time, controlling the curvature radius R6 of the image side surface of the third lens and the outer diameter D3s of the object side surface of the third spacer element to satisfy the conditional formula -1.5 < R6 / D3s < 0 can reasonably restrict the shapes of the object side surface and the image side surface of the third lens, which is beneficial to the processing of the third lens. At the same time, controlling the outer diameter of the image side surface of the second spacer element and the outer diameter of the object side surface of the third spacer element is beneficial to ensuring the assembly stability of the second and third lenses.

[0075] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the optical imaging system may be changed, and the number of spacing elements may also be changed to obtain the various results and advantages described in this specification, and the present application does not specifically limit this. For example, although six lenses are described as an example in the embodiment, the optical imaging system is not limited to including six lenses. If necessary, the optical imaging system may also include other numbers of lenses. For another example, as needed, the optical imaging system may also include other numbers of spacing elements different from those described in the above embodiment.

[0076] Specific embodiments of the optical imaging system applicable to the above-mentioned embodiments are further described below with reference to the accompanying drawings.

[0077] Example 1

[0078] The following reference Figure 2 An optical imaging system according to Example 1 of the present application is described.

[0079] like Figure 2 As shown, in this embodiment, the optical imaging system includes a lens barrel and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6 accommodated in the lens barrel and arranged in sequence from the object side to the image side along the optical axis.

[0080] In this embodiment, the optical imaging system further comprises a plurality of spacing elements: a first spacing element P1, located on the image side of the first lens E1 and in at least partial contact with the image side surface of the first lens E1; a second spacing element P2, located on the image side of the second lens E2 and in at least partial contact with the image side surface of the second lens E2; a third spacing element P3, located on the image side of the third lens E3 and in at least partial contact with the image side surface of the third lens E3; a third auxiliary spacing element P3b, located on the image side of the third spacing element P3 and in at least partial contact with the image side surface of the third spacing element P3; a fourth spacing element P4, located on the image side of the fourth lens E4 and in at least partial contact with the image side surface of the fourth lens E4; and a fifth spacing element P5, located on the image side of the fifth lens E5 and in at least partial contact with the image side surface of the fifth lens E5.

[0081] In this embodiment, the first lens E1 has negative power, its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative power, its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive power, its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has positive power, its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has negative power, its object side surface S9 is concave, and its image side surface S10 is concave. The sixth lens E6 has positive power, its object side surface S11 is convex, and its image side surface S12 is concave.

[0082] Table 1 shows the basic parameters of the optical imaging system of Example 1, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0083]

[0084] In Example 1, the object side surface and the image side surface of any lens from the second lens E2 to the sixth lens E6 are both aspherical surfaces, and the surface shape x of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0085]

[0086] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 below gives the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0087]

[0088]

[0089] Table 2

[0090] Example 2

[0091] The following reference Figure 3 Describe the optical imaging system according to Example 2 of the present application.

[0092] like Figure 3As shown, in this embodiment, the optical imaging system includes a lens barrel and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6 which are accommodated in the lens barrel and arranged in sequence from the object side to the image side along the optical axis. The optical imaging system also includes a plurality of spacing elements: a first spacing element P1, which is located on the image side of the first lens E1 and at least partially in contact with the image side surface of the first lens E1; a second spacing element P2, which is located on the image side of the second lens E2 and at least partially in contact with the image side surface of the second lens E2; a third spacing element P3, which is located on the image side of the third lens E3 and at least partially in contact with the image side surface of the third lens E3; a third auxiliary spacing element P3b, which is located on the image side of the third spacing element P3 and at least partially in contact with the image side surface of the third spacing element P3; a fourth spacing element P4, which is located on the image side of the fourth lens E4 and at least partially in contact with the image side surface of the fourth lens E4; and a fifth spacing element P5, which is located on the image side of the fifth lens E5 and at least partially in contact with the image side surface of the fifth lens E5.

[0093] The structure of the optical imaging system of this embodiment is the same as that of the optical imaging system of Embodiment 1, that is, the basic parameter table of the optical imaging system of this embodiment is the same as Table 1, and the high-order coefficient table of the aspheric mirror surface is the same as Table 2.

[0094] The difference between this embodiment and embodiment 1 lies in the different parameters such as the structural dimensions of the lens barrel and some of the spacing elements and the spacing of some of the spacing elements along the optical axis. The values ​​of multiple parameters of the lens barrel and the spacing elements included in the optical imaging system of this embodiment and embodiment 1 are shown in Table 7 below, and the multiple parameters specifically include:

[0095] The inner diameter d1s of the object side surface of the first spacing element P1, the inner diameter d2s of the object side surface of the second spacing element P2, the outer diameter D2s of the object side surface of the second spacing element P2, the outer diameter D2m of the image side surface of the second spacing element P2, the outer diameter D3s of the object side surface of the third spacing element P3, the outer diameter D3m of the image side surface of the third spacing element P3, the outer diameter D4m of the image side surface of the fourth spacing element P4, the inner diameter d5s of the object side surface of the fifth spacing element P5, the outer diameter D5s of the object side surface of the fifth spacing element P5, the outer diameter D0s of the object side end surface of the lens barrel, the outer diameter D0m of the image side end surface of the lens barrel, the outer diameter D1s of the object side end surface of the lens barrel from the object side end surface of the lens barrel to the first spacing element The distance EP01 of the object side surface of the component P1 on the optical axis, the distance EP12 from the first spacing element to the second spacing element on the optical axis, the distance EP23 from the second spacing element to the third spacing element on the optical axis, the thickness CP3 of the third spacing element P3, the distance EP34 from the third spacing element to the fourth spacing element on the optical axis, the thickness CP4 of the fourth spacing element P4, the distance EP45 from the fourth spacing element to the fifth spacing element on the optical axis, the thickness CP5 of the fifth spacing element P5, the inner diameter d3bs of the object side surface of the third auxiliary spacing element P3b, and the outer diameter D3bm of the image side surface of the third auxiliary spacing element P3b. The units of the numerical values ​​of the parameters shown in Table 7 are all millimeters (mm), and the schematic diagram of the parameters in the structural diagram of the optical imaging system is as follows Figure 1 shown.

[0096] Example 3

[0097] The following reference Figure 4 Describe the optical lens according to Example 3 of the present application.

[0098] like Figure 4 As shown, in this embodiment, the optical imaging system includes a lens barrel and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6 which are accommodated in the lens barrel and arranged in sequence from the object side to the image side along the optical axis. The optical imaging system also includes a plurality of spacing elements: a first spacing element P1, which is located on the image side of the first lens E1 and at least partially in contact with the image side surface of the first lens E1; a second spacing element P2, which is located on the image side of the second lens E2 and at least partially in contact with the image side surface of the second lens E2; a third spacing element P3, which is located on the image side of the third lens E3 and at least partially in contact with the image side surface of the third lens E3; a third auxiliary spacing element P3b, which is located on the image side of the third spacing element P3 and at least partially in contact with the image side surface of the third spacing element P3; a fourth spacing element P4, which is located on the image side of the fourth lens E4 and at least partially in contact with the image side surface of the fourth lens E4; and a fifth spacing element P5, which is located on the image side of the fifth lens E5 and at least partially in contact with the image side surface of the fifth lens E5.

[0099] The structure of the optical imaging system of this embodiment is also the same as that of the optical imaging system of Embodiment 1, that is, the basic parameter table of the optical imaging system of this embodiment is the same as Table 1, and the high-order coefficient table of the aspheric mirror surface is the same as Table 2.

[0100] The difference between this embodiment and embodiment 1 lies in the difference in parameters such as the structural dimensions of the lens barrel and some of the spacing elements and the spacing of some of the spacing elements along the optical axis. The values ​​of multiple parameters of the lens barrel and the spacing elements included in the optical imaging system of this embodiment and embodiment 1 are also shown in Table 7 below, and the specific description of the multiple parameters is the same as the relevant description in the above embodiment 2, which will not be repeated here.

[0101] Figure 5 The axial chromatic aberration curves of the optical imaging systems of Embodiment 1, Embodiment 2 and Embodiment 3 are shown, which indicate the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Figure 6 Astigmatism curves of the optical imaging systems of Example 1, Example 2 and Example 3 are shown, which represent meridional image curvature and sagittal image curvature. Figure 7 Distortion curves of the optical imaging systems of Embodiment 1, Embodiment 2 and Embodiment 3 are shown, which represent the distortion magnitude values ​​corresponding to different field of view angles. Figure 8 The magnification chromatic aberration curves of the optical imaging systems of Example 1, Example 2 and Example 3 are shown, which represent the deviations of different image heights on the imaging surface after the light passes through the lens. Figures 5 to 8 It can be seen that the optical imaging systems provided in Embodiment 1, Embodiment 2 and Embodiment 3 can achieve good imaging quality.

[0102] Example 4

[0103] The following reference Fig. 9 Describe the optical imaging system according to Example 4 of the present application.

[0104] like Fig. 9 As shown, in this embodiment, the optical imaging system includes a lens barrel and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6 accommodated in the lens barrel and arranged in sequence from the object side to the image side along the optical axis.

[0105] In this embodiment, the optical imaging system further comprises a plurality of spacing elements: a first spacing element P1, located on the image side of the first lens E1 and in at least partial contact with the image side surface of the first lens E1; a second spacing element P2, located on the image side of the second lens E2 and in at least partial contact with the image side surface of the second lens E2; a third spacing element P3, located on the image side of the third lens E3 and in at least partial contact with the image side surface of the third lens E3; a third auxiliary spacing element P3b, located on the image side of the third spacing element P3 and in at least partial contact with the image side surface of the third spacing element P3; a fourth spacing element P4, located on the image side of the fourth lens E4 and in at least partial contact with the image side surface of the fourth lens E4; and a fifth spacing element P5, located on the image side of the fifth lens E5 and in at least partial contact with the image side surface of the fifth lens E5.

[0106] In this embodiment, the first lens E1 has negative power, its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative power, its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive power, its object side surface S5 is concave, and its image side surface S6 is convex. The fourth lens E4 has positive power, its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has negative power, its object side surface S9 is concave, and its image side surface S10 is concave. The sixth lens E6 has positive power, its object side surface S11 is convex, and its image side surface S12 is convex.

[0107] Table 3 shows the basic parameters of the optical imaging system of Example 4, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0108]

[0109]

[0110] Table 3

[0111] In this embodiment, the object side surface and the image side surface of any lens of the second lens E2 to the sixth lens E6 are both aspherical surfaces, and the surface shape of each aspherical surface can be defined by the formula (1) given in the above embodiment 1. Table 4 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A71, A72, A73, A74, A75 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0112] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S3 -3.0527E-01 1.2046E-02 1.3476E-03 -2.1050E-04 4.6380E-05 1.9053E-04 2.4679E-04 -1.3265E-04 -1.4046E-05 S4 3.1731E-01 9.5634E-03 -2.3502E-03 -3.7634E-03 -9.0711E-04 -6.5738E-04 2.4113E-04 1.5038E-04 1.4265E-04 S5 -4.9611E-02 -6.0530E-03 -1.0904E-03 7.2061E-04 4.0123E-05 1.9878E-04 1.4644E-05 3.6820E-05 -7.0318E-05 S6 6.1492E-02 -3.5808E-03 1.0191E-03 1.9880E-04 2.1164E-04 1.1361E-04 -1.9499E-06 -5.9186E-05 -1.2171E-05 S7 1.5058E-02 -9.2774E-03 -2.0451E-04 -3.7089E-04 1.5054E-05 -3.3119E-05 7.0425E-06 -8.9193E-06 -4.1624E-06 S8 1.0519E-02 -2.7875E-03 -4.6993E-04 8.3894E-04 -7.8622E-04 3.6292E-04 -2.0657E-04 8.1733E-05 -3.6824E-05 S9 -6.1020E-02 6.8037E-03 -2.1914E-03 1.0409E-03 -6.4861E-04 2.4134E-04 1.4758E-07 2.2867E-05 8.6354E-05 S10 8.9458E-02 -1.3287E-02 -1.6155E-03 3.3315E-04 -9.1632E-04 2.5840E-04 -6.6036E-05 6.8172E-06 -7.5395E-06 S11 8.6591E-02 2.2465E-03 -2.2920E-03 1.1901E-03 -9.9981E-04 -2.8000E-05 3.4637E-05 -2.0374E-05 9.2080E-05 S12 4.2921E-02 2.0819E-02 3.9295E-03 6.1335E-04 -3.4156E-04 -3.1499E-04 -2.1831E-04 -3.6857E-05 -3.0473E-05

[0113] Table 4

[0114] Example 5

[0115] The following reference Fig.10 Describe the optical imaging system according to Example 5 of the present application.

[0116] like Fig.10 As shown, in this embodiment, the optical imaging system includes a lens barrel and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6 which are accommodated in the lens barrel and arranged in sequence from the object side to the image side along the optical axis. The optical imaging system also includes a plurality of spacing elements: a first spacing element P1, which is located on the image side of the first lens E1 and at least partially in contact with the image side surface of the first lens E1; a second spacing element P2, which is located on the image side of the second lens E2 and at least partially in contact with the image side surface of the second lens E2; a third spacing element P3, which is located on the image side of the third lens E3 and at least partially in contact with the image side surface of the third lens E3; a third auxiliary spacing element P3b, which is located on the image side of the third spacing element P3 and at least partially in contact with the image side surface of the third spacing element P3; a fourth spacing element P4, which is located on the image side of the fourth lens E4 and at least partially in contact with the image side surface of the fourth lens E4; and a fifth spacing element P5, which is located on the image side of the fifth lens E5 and at least partially in contact with the image side surface of the fifth lens E5.

[0117] The structure of the optical imaging system of this embodiment is the same as that of the optical imaging system of Embodiment 4, that is, the basic parameter table of the optical imaging system of this embodiment is the same as Table 3, and the high-order coefficient table of the aspheric mirror is the same as Table 4.

[0118] The difference between this embodiment and embodiment 4 is that the structural dimensions of the lens barrel and some of the spacing elements and the spacing of some of the spacing elements along the optical axis are different. The values ​​of multiple parameters of the lens barrel and the spacing elements included in the optical imaging system of this embodiment and embodiment 4 are shown in Table 7 below, and the specific description of the multiple parameters is the same as the relevant description in the above embodiment 2, which will not be repeated here.

[0119] Example 6

[0120] The following reference Fig.11 Describe the optical lens according to Example 6 of the present application.

[0121] like Fig.11As shown, in this embodiment, the optical imaging system includes a lens barrel and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6 which are accommodated in the lens barrel and arranged in sequence from the object side to the image side along the optical axis. The optical imaging system also includes a plurality of spacing elements: a first spacing element P1, which is located on the image side of the first lens E1 and at least partially in contact with the image side surface of the first lens E1; a second spacing element P2, which is located on the image side of the second lens E2 and at least partially in contact with the image side surface of the second lens E2; a third spacing element P3, which is located on the image side of the third lens E3 and at least partially in contact with the image side surface of the third lens E3; a third auxiliary spacing element P3b, which is located on the image side of the third spacing element P3 and at least partially in contact with the image side surface of the third spacing element P3; a fourth spacing element P4, which is located on the image side of the fourth lens E4 and at least partially in contact with the image side surface of the fourth lens E4; and a fifth spacing element P5, which is located on the image side of the fifth lens E5 and at least partially in contact with the image side surface of the fifth lens E5.

[0122] The structure of the optical imaging system of this embodiment is also the same as that of the optical imaging system of Embodiment 4, that is, the basic parameter table of the optical imaging system of this embodiment is the same as Table 3, and the high-order coefficient table of the aspheric mirror surface is the same as Table 4.

[0123] The difference between this embodiment and embodiment 4 is that the structural dimensions of the lens barrel and some of the spacing elements and the spacing of some of the spacing elements along the optical axis are different. The values ​​of multiple parameters of the lens barrel and the spacing elements included in the optical imaging system of this embodiment and embodiment 4 are also shown in Table 7 below, and the specific description of the multiple parameters is also the same as the relevant description in the above embodiment 2, which will not be repeated here.

[0124] Fig.12 The axial chromatic aberration curves of the optical imaging systems of Examples 4, 5 and 6 are shown, which indicate the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig.13 Astigmatism curves of the optical imaging systems of Example 4, Example 5 and Example 6 are shown, which represent meridional image plane curvature and sagittal image plane curvature. Fig.14 Distortion curves of the optical imaging systems of Embodiment 4, Embodiment 5 and Embodiment 6 are shown, which represent the distortion magnitude values ​​corresponding to different field of view angles. Fig.15 The magnification chromatic aberration curves of the optical imaging systems of Example 4, Example 5 and Example 6 are shown, which represent the deviations of different image heights on the imaging surface after the light passes through the lens. Figures 12 to 15 It can be seen that the optical imaging systems provided in Embodiment 4, Embodiment 5 and Embodiment 6 can achieve good imaging quality.

[0125] Example 7

[0126] The following reference Fig.16 Describe the optical imaging system according to Example 7 of the present application.

[0127] like Fig.16 As shown, in this embodiment, the optical imaging system includes a lens barrel and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6 accommodated in the lens barrel and arranged in sequence from the object side to the image side along the optical axis.

[0128] In this embodiment, the optical imaging system further comprises a plurality of spacing elements: a first spacing element P1, located on the image side of the first lens E1 and in at least partial contact with the image side surface of the first lens E1; a second spacing element P2, located on the image side of the second lens E2 and in at least partial contact with the image side surface of the second lens E2; a third spacing element P3, located on the image side of the third lens E3 and in at least partial contact with the image side surface of the third lens E3; a third auxiliary spacing element P3b, located on the image side of the third spacing element P3 and in at least partial contact with the image side surface of the third spacing element P3; a fourth spacing element P4, located on the image side of the fourth lens E4 and in at least partial contact with the image side surface of the fourth lens E4; and a fifth spacing element P5, located on the image side of the fifth lens E5 and in at least partial contact with the image side surface of the fifth lens E5.

[0129] In this embodiment, the first lens E1 has negative power, its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative power, its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive power, its object side surface S5 is concave, and its image side surface S6 is convex. The fourth lens E4 has positive power, its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has negative power, its object side surface S9 is concave, and its image side surface S10 is concave. The sixth lens E6 has positive power, its object side surface S11 is convex, and its image side surface S12 is convex.

[0130] Table 5 shows the basic parameters of the optical imaging system of Example 7, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0131]

[0132] Table 5

[0133] In this embodiment, the object side surface and the image side surface of any lens of the second lens E2 to the sixth lens E6 are both aspherical surfaces, and the surface shape of each aspherical surface can be defined by the formula (1) given in the above embodiment 1. Table 6 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52 10 , A 12 , A14 , A 16 , A 18 and A 20 .

[0134] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S3 -3.0564E-01 1.3511E-02 1.9401E-03 3.2952E-04 -1.2149E-05 3.5039E-05 1.4968E-04 -1.3986E-04 4.7394E-05 S4 3.3699E-01 1.1155E-02 -8.2703E-04 -2.3446E-03 -1.0101E-03 -6.2439E-04 -9.1206E-05 9.5463E-06 5.7184E-05 S5 -5.6164E-02 -6.3065E-03 -5.6544E-04 3.8802E-04 1.9748E-04 7.3559E-05 8.2730E-06 -2.0386E-05 -2.4004E-05 S6 6.9622E-02 -2.8021E-03 1.2087E-03 1.2007E-04 4.9161E-05 4.1214E-05 -4.8992E-06 1.3114E-05 -8.4613E-06 S7 1.6877E-02 -9.1325E-03 -3.5567E-04 -3.3593E-04 -2.9046E-05 -2.3141E-05 2.6769E-06 -3.9946E-06 -8.3612E-06 S8 1.0866E-02 -2.9285E-03 7.3543E-05 6.3750E-04 -4.1920E-04 2.6162E-04 -1.1454E-04 2.4262E-05 -3.2628E-05 S9 -6.1346E-02 6.8058E-03 -2.7646E-03 1.2909E-03 -7.9084E-04 3.1718E-04 -1.1284E-04 2.2482E-05 -3.3195E-05 S10 9.2878E-02 -1.3944E-02 -1.5505E-03 1.8581E-04 -9.6261E-04 1.5016E-04 4.0538E-05 7.0817E-06 -9.0992E-08 S11 8.5713E-02 1.6632E-03 -2.6870E-03 1.4190E-03 -1.0447E-03 1.6119E-05 4.7628E-05 7.2326E-06 -3.1495E-07 S12 4.5967E-02 2.2129E-02 4.6406E-03 4.9992E-04 -3.7305E-04 -4.3560E-04 -1.7505E-04 -2.7463E-05 3.3034E-05

[0135] Table 6

[0136] Example 8

[0137] The following reference Fig.17 Describe the optical imaging system according to Example 8 of the present application.

[0138] like Fig.17 As shown, in this embodiment, the optical imaging system includes a lens barrel and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6 which are accommodated in the lens barrel and arranged in sequence from the object side to the image side along the optical axis. The optical imaging system also includes a plurality of spacing elements: a first spacing element P1, which is located on the image side of the first lens E1 and at least partially in contact with the image side surface of the first lens E1; a second spacing element P2, which is located on the image side of the second lens E2 and at least partially in contact with the image side surface of the second lens E2; a third spacing element P3, which is located on the image side of the third lens E3 and at least partially in contact with the image side surface of the third lens E3; a third auxiliary spacing element P3b, which is located on the image side of the third spacing element P3 and at least partially in contact with the image side surface of the third spacing element P3; a fourth spacing element P4, which is located on the image side of the fourth lens E4 and at least partially in contact with the image side surface of the fourth lens E4; and a fifth spacing element P5, which is located on the image side of the fifth lens E5 and at least partially in contact with the image side surface of the fifth lens E5.

[0139] The structure of the optical imaging system of this embodiment is the same as that of the optical imaging system of Example 7, that is, the basic parameter table of the optical imaging system of this embodiment is the same as Table 5, and the high-order coefficient table of the aspheric mirror is the same as Table 6.

[0140] The difference between this embodiment and embodiment 7 is that the structural dimensions of the lens barrel and some of the spacing elements and the spacing of some of the spacing elements along the optical axis are different. The values ​​of multiple parameters of the lens barrel and the spacing elements included in the optical imaging system of this embodiment and embodiment 7 are shown in Table 7 below. The specific description of the multiple parameters is the same as the relevant description in the above embodiment 2, and will not be repeated here.

[0141] Example 9

[0142] The following reference Fig.18 Describe the optical lens according to Example 9 of the present application.

[0143] like Fig.18As shown, in this embodiment, the optical imaging system includes a lens barrel and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6 which are accommodated in the lens barrel and arranged in sequence from the object side to the image side along the optical axis. The optical imaging system also includes a plurality of spacing elements: a first spacing element P1, which is located on the image side of the first lens E1 and at least partially in contact with the image side surface of the first lens E1; a second spacing element P2, which is located on the image side of the second lens E2 and at least partially in contact with the image side surface of the second lens E2; a third spacing element P3, which is located on the image side of the third lens E3 and at least partially in contact with the image side surface of the third lens E3; a third auxiliary spacing element P3b, which is located on the image side of the third spacing element P3 and at least partially in contact with the image side surface of the third spacing element P3; a fourth spacing element P4, which is located on the image side of the fourth lens E4 and at least partially in contact with the image side surface of the fourth lens E4; and a fifth spacing element P5, which is located on the image side of the fifth lens E5 and at least partially in contact with the image side surface of the fifth lens E5.

[0144] The structure of the optical imaging system of this embodiment is also the same as the structure of the optical imaging system of Example 7, that is, the basic parameter table of the optical imaging system of this embodiment is the same as Table 5, and the high-order coefficient table of the aspheric mirror surface is the same as Table 6.

[0145] The difference between this embodiment and embodiment 7 is that the structural dimensions of the lens barrel and some of the spacing elements and the spacing of some of the spacing elements along the optical axis are different. The values ​​of multiple parameters of the lens barrel and the spacing elements included in the optical imaging system of this embodiment and embodiment 7 are also shown in Table 7 below, and the specific description of the multiple parameters is also the same as the relevant description in the above embodiment 2, which will not be repeated here.

[0146] Fig.19 The axial chromatic aberration curves of the optical imaging systems of Example 7, Example 8 and Example 9 are shown, which indicate the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 20 Astigmatism curves of the optical imaging systems of Example 7, Example 8 and Example 9 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Fig.21 Distortion curves of the optical imaging systems of Embodiment 7, Embodiment 8 and Embodiment 9 are shown, which represent the distortion magnitude values ​​corresponding to different field of view angles. Fig. 22 The magnification chromatic aberration curves of the optical imaging systems of Example 7, Example 8 and Example 9 are shown, which represent the deviations of different image heights on the imaging surface after the light passes through the lens. Figures 19 to 22 It can be seen that the optical imaging systems provided in Examples 7, 8 and 9 can achieve good imaging quality.

[0147]

[0148]

[0149] Table 7

[0150] In addition, in Examples 1 to 9, half of the maximum field of view Semi-FOV of the optical imaging system, the effective focal length f of the optical imaging system, the effective focal length values ​​f1 to f6 of the first to sixth lenses, the on-axis distance SAG22 from the intersection of the image side surface of the second lens and the optical axis to the vertex of the effective radius of the image side surface of the second lens, and the combined focal length f23 of the second lens and the third lens are respectively as shown in Table 8 below.

[0151] Parameters / Examples 1 2 3 4 5 6 7 8 9 Semi-FOV(°) 80.5300 80.5300 80.5300 80.0000 80.0000 80.0000 80.0000 80.0000 80.0000 f(mm) 1.1000 1.1000 1.1000 1.7353 1.7353 1.7353 1.6988 1.6988 1.6988 f1(mm) -3.6009 -3.6009 -3.6009 -9.1984 -9.1984 -9.1984 -7.9042 -7.9042 -7.9042 f2(mm) -4.4750 -4.4750 -4.4750 -3.0583 -3.0583 -3.0583 -2.7224 -2.7224 -2.7224 f3(mm) 3.5044 3.5044 3.5044 4.2291 4.2291 4.2291 4.0679 4.0679 4.0679 f4(mm) 1.7404 1.7404 1.7404 1.6852 1.6852 1.6852 1.7204 1.7204 1.7204 f5(mm) -1.7236 -1.7236 -1.7236 -1.4365 -1.4365 -1.4365 -1.5290 -1.5290 -1.5290 f6(mm) 3.0342 3.0342 3.0342 2.3503 2.3503 2.3503 2.3804 2.3804 2.3804 SAG22(mm) 1.0417 1.0417 1.0417 0.8856 0.8856 0.8856 1.0173 1.0173 1.0173 f23(mm) 6.5262 6.5262 6.5262 13.6921 13.6921 13.6921 11.2501 11.2501 11.2501

[0152] Table 8 Examples 1 to 9 respectively satisfy the conditions shown in Table 9 below.

[0153]

[0154]

[0155] Table 9

[0156] The present application also provides an imaging device, which is provided with an electronic photosensitive element for imaging, and the electronic photosensitive element can be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated in a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging system described above.

[0157] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of protection involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the concept of the present application. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) to form a technical solution.

Claims

1. An optical imaging system, characterized in that: It includes a lens barrel and a lens group and a spacer element group accommodated in the lens barrel. Among them, the lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in sequence from the object side to the image side along the optical axis; among them, the air gap between the second lens and the third lens on the optical axis is greater than the air gaps between any other adjacent lenses on the optical axis; the spacer element group includes: a first spacer element located on the image side of the first lens and at least partially in contact with the image side surface of the first lens; a second spacer element located on the image side of the second lens and at least partially in contact with the image side surface of the second lens; a third spacer element located on the image side of the third lens and at least partially in contact with the image side surface of the third lens; a fourth spacer element located on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens; and a fifth spacer element located on the image side of the fifth lens and at least partially in contact with the image side surface of the fifth lens; the optical imaging system satisfies: 75° < Semi-FOV < 85°, 1.2 < D0s / D0m < 2.5, and -8 < f2 / (T23 - EP12) < -4, wherein, Semi-FOV is half of the maximum field of view angle of the optical imaging system, D0s is the outer diameter of the object side end face of the lens barrel, D0m is the outer diameter of the image side end face of the lens barrel, f2 is the effective focal length of the second lens, T23 is the air gap between the second lens and the third lens on the optical axis, and EP12 is the distance on the optical axis from the first spacer element to the second spacer element.

2. The optical imaging system according to claim 1, characterized in that: The distance EP01 on the optical axis from the object side end face of the lens barrel to the object side surface of the first spacer element and the central thickness CT1 of the first lens on the optical axis satisfy: 1 < EP01 / CT1 < 3.

3. The optical imaging system according to claim 1, characterized in that: The effective focal length f1 of the first lens, the effective focal length f of the optical imaging system, and the inner diameter d1s of the object side surface of the first spacer element satisfy: -6 < f1 / f < -2.8 and -2.5 < f1 / d1s < -0.

5.

4. The optical imaging system according to claim 1, characterized in that: The combined focal length f23 of the second lens and the third lens and the distance EP23 on the optical axis from the second spacer element to the third spacer element satisfy: 7.5 < f23 / EP23 < 12.

5. The optical imaging system according to claim 1, characterized in that: The outer diameter D2s of the object side surface of the second spacer element, the inner diameter d2s of the object side surface of the second spacer element, and the curvature radius R3 of the object side surface of the second lens satisfy: -3 < D2s / f2 < -0.3 and 0.3 < d2s / R3 < 3.

5.

6. The optical imaging system according to claim 1, characterized in that: The central thickness CT3 of the third lens on the optical axis and the thickness CP3 of the third spacer element satisfy: 1 < CT3 / CP3 < 2.

2.

7. The optical imaging system according to claim 1, characterized in that: The effective focal length f3 of the third lens, the thickness CP3 of the third spacer element, and the refractive index N3 of the third lens satisfy: 6 < f3 / CP3 × N3 < 12.

8. The optical imaging system according to any one of claims 1 to 7, characterized in that: The outer diameter D2m of the image side of the second spacer element, the radius of curvature R5 of the object side of the third lens, the radius of curvature R6 of the image side of the third lens, and the outer diameter D3s of the object side of the third spacer element satisfy: -2.5 < D2m / R5 < 1.3 and -1.5 < R6 / D3s < 0.

9. The optical imaging system according to any one of claims 1 to 7, characterized in that: The distance EP45 on the optical axis from the fourth spacer element to the fifth spacer element and the distance EP34 on the optical axis from the third spacer element to the fourth spacer element satisfy: 1 < EP45 / EP34 < 2.

10. The optical imaging system according to any one of claims 1 to 7, characterized in that: The outer diameter D3m of the image side of the third spacer element, the outer diameter D4m of the image side of the fourth spacer element, the distance EP34 on the optical axis from the third spacer element to the fourth spacer element, and the air gap T34 on the optical axis between the third lens and the fourth lens satisfy: 0.5 < D3m / D4m < 1 and 0.5 < EP34 / T34 < 2.

11. The optical imaging system according to any one of claims 1 to 7, characterized in that: The air gap T45 on the optical axis between the fourth lens and the fifth lens, the thickness CP4 of the fourth spacer element, and the thickness CP5 of the fifth spacer element satisfy: 0 < T45 / (CP4 + CP5) < 2.

12. The optical imaging system according to any one of claims 1 to 7, characterized in that: The spacer element group further includes: a third auxiliary spacer element, located on the image side of the third spacer element and at least partially in contact with the image side of the third spacer element; The effective focal length f3 of the third lens, the inner diameter d3bs of the object side of the third auxiliary spacer element, the effective focal length f4 of the fourth lens, and the outer diameter D3bm of the image side of the third auxiliary spacer element satisfy: 2.2 < f3 / d3bs < 2.9 and 0.2 < f4 / D3bm < 0.

6.

13. The optical imaging system according to any one of claims 1 to 7, characterized in that: The inner diameter d5s of the object side of the fifth spacer element, the outer diameter D5s of the object side of the fifth spacer element, and the effective focal length f5 of the fifth lens satisfy: -4 < (d5s + D5s) / f5 < -2.

8.

14. The optical imaging system according to any one of claims 1 to 7, characterized in that: The axial distance SAG22 from the intersection of the image side of the second lens and the optical axis to the vertex of the effective radius of the image side of the second lens and the distance EP23 on the optical axis from the second spacer element to the third spacer element satisfy: 0.72 ≤ SAG22 / EP23 < 1.

5.

15. The optical imaging system according to any one of claims 1 to 7, characterized in that: The inner diameter values and the outer diameter values of the object sides of the first spacer element to the third spacer element show a decreasing trend.

Images