Optical imaging module

Abstract

The utility model provides an optical imaging module. The optical imaging module comprises at least one lens barrel, eight lenses and at least one spacing element, wherein the eight lenses sequentially comprise a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens from an object side to an image side; the at least one spacing element comprises a fifth spacing element; an air interval T23 between the second lens and the third lens on the optical axis, an air interval T34 between the third lens and the fourth lens on the optical axis, and an air interval T45 between the fourth lens and the fifth lens on the optical axis meet the condition that T34 / (T23 + T45) is greater than or equal to 2.11 and less than or equal to 2.94; the effective focal length f5 of the fifth lens and the inner diameter d5s of the object side surface of the fifth spacing element satisfy the following condition: 0.91 < = f5 / d5s < = 1.40. According to the utility model, the problem of serious stray light caused by the fact that an optical imaging module in the prior art meets assembly requirements is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of optical imaging equipment, and in particular to an optical imaging module. Background Art

[0002] With the continuous advancement of technology, smartphone photography capabilities are becoming a key consideration for consumers. To meet users' demand for a high-quality photography experience, mobile phone manufacturers typically equip mainstream phones with three lenses: a main camera, a telephoto lens, and a wide-angle lens. Through continuous exploration and innovation, mobile phone manufacturers require a single lens to perform multiple functions, resolving the conflict between mobile phone camera performance and the space occupied by the optical imaging module.

[0003] However, optical imaging modules with multiple functions also face challenges in design. To meet assembly requirements, it is necessary to reasonably control the arrangement of multiple lenses in the middle position of the optical imaging module. However, in this case, the edge structure areas of some lenses in the middle position are prone to stray light, which in turn affects the imaging quality.

[0004] That is to say, the optical imaging module in the prior art has the problem of serious stray light caused by not meeting the assembly requirements. Utility Model Content

[0005] The main purpose of the present utility model is to provide an optical imaging module to solve the problem in the prior art that the optical imaging module has serious stray light caused by not meeting the assembly requirements.

[0006] To achieve the above-mentioned objectives, according to one aspect of the present invention, an optical imaging module is provided, comprising at least one lens barrel, eight lenses and at least one spacer element, wherein the eight lenses and the at least one spacer element are arranged in the at least one lens barrel, and the eight lenses include, in order from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens; the at least one spacer element includes a fifth spacer element, which is located between the fifth lens and the sixth lens and contacts the image side surface of the fifth lens; wherein the air gap T23 on the optical axis between the second lens and the third lens, the air gap T34 on the optical axis between the third lens and the fourth lens, and the air gap T45 on the optical axis between the fourth lens and the fifth lens satisfy the following conditions: 2.11≤T34 / (T23+T45)≤2.94; and the effective focal length f5 of the fifth lens and the inner diameter d5s of the object side surface of the fifth spacer element satisfy the following conditions: 0.91≤f5 / d5s≤1.40.

[0007] According to another aspect of the present invention, an optical imaging module is also provided, comprising at least one lens barrel, eight lenses, and at least one spacer element, wherein the eight lenses and the at least one spacer element are arranged in the at least one lens barrel, and the eight lenses include, from the object side to the image side, a first lens having positive focal power, a second lens having optical focal power, a third lens having negative optical focal power, a fourth lens having negative optical focal power, a fifth lens having positive optical focal power, a sixth lens having optical focal power, a seventh lens having optical focal power, and an eighth lens having negative optical focal power; the at least one spacer element includes a fifth spacer element, and the fifth spacer element is located between the fifth lens and the image side. The eighth lens has an outer diameter D30s of the second lens barrel and an inner diameter d30s of the second lens barrel closest to the object side, and the eighth lens has an outer diameter D30s of the second lens barrel closest to the object side, and the eighth lens has an outer diameter D30s of the second lens barrel closest to the object side, and the eighth lens has an inner diameter d30s of the second lens barrel closest to the object side, and the eighth lens has an outer diameter D30s of the second lens barrel closest to the object side, and the eighth lens has an outer diameter d30s of the second lens barrel closest to the object side, and the eighth lens has an outer diameter d30s of the second lens barrel closest to the object side, and the eighth lens has an outer diameter d30s of the second lens barrel closest to the object side, and the eighth lens has an inner ... inner diameter d30s of the second lens barrel closest to the object side, and the eighth lens has an inner diameter d30s of the second lens barrel closest to the object side, and the eighth lens has an inner diameter d30s of the second lens barrel closest to the object side, and the eighth lens has an inner diameter d30s of the second lens barrel closest to the object side, and the eighth lens has an inner diameter d30s of the second lens barrel closest to the object side, and the eighth lens has an inner diameter d30s of the second lens barrel closest to the object

[0008] According to another aspect of the present invention, an optical imaging module is provided, comprising at least one lens barrel, eight lenses, and at least one spacer element, wherein the eight lenses include, in order from the object side to the image side, a first lens with positive focal power, a second lens with optical power, a third lens with negative optical power, a fourth lens with negative optical power, a fifth lens with positive optical power, a sixth lens with optical power, a seventh lens with optical power, and an eighth lens with negative optical power; the number of the lens barrels is three, and the three lens barrels are, in order from the object side to the image side, a first lens barrel, a second lens barrel, and a third lens barrel, wherein the first lens is disposed in the first lens barrel, the second to seventh lenses are disposed in the second lens barrel, and the eighth lens is disposed in the third lens barrel; At least one spacer element includes a fourth spacer element located between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens, and a fifth spacer element located between the fifth lens and the sixth lens and in contact with the image side surface of the fifth lens; the outer diameter D10s of the end surface of the first lens barrel closest to the object side, the inner diameter d10s of the end surface of the first lens barrel closest to the object side, and the center thickness CT1 of the first lens on the optical axis satisfy: 0.68≤(D10s-d10s) / CT1≤1.13; the axial spacing EP45 between the fourth spacer element and the fifth spacer element and the inner diameter d4s of the object side surface of the fourth spacer element satisfy: 0.07≤EP45 / d4s≤0.09.

[0009] Furthermore, there are three lens barrels, which are the first lens barrel, the second lens barrel and the third lens barrel in order from the object side to the image side. The first lens is arranged in the first lens barrel, the second lens to the seventh lens are arranged in the second lens barrel, and the eighth lens is arranged in the third lens barrel.

[0010] Furthermore, the curvature radius R1 of the object-side surface of the first lens, the outer diameter D10s of the end surface of the first lens barrel closest to the object side, and the inner diameter d10s of the end surface of the first lens barrel closest to the object side satisfy: 7.49≤R1 / (D10s-d10s)≤14.17.

[0011] Furthermore, the curvature radius R2 of the image-side surface of the first lens, the curvature radius R3 of the object-side surface of the second lens, the inner diameter d10m of the end surface of the first lens barrel closest to the image side, and the outer diameter D20s of the end surface of the second lens barrel closest to the object side satisfy the following relationship: 1.39≤R2*d10m / (R3*D20s)≤2.47.

[0012] Furthermore, the effective focal length f1 of the first lens, the center thickness CT1 of the first lens on the optical axis, and the maximum axial height L10 of the first lens barrel satisfy the following relationship: 7.06≤f1 / (CT1+L10)≤16.53.

[0013] Furthermore, the at least one spacer element also includes a third spacer element located between the third lens and the fourth lens and partially in contact with the image side surface of the third lens, and the inner diameter d3s of the object side surface of the third spacer element, the inner diameter d3m of the image side surface of the third spacer element, the curvature radius R6 of the image side surface of the third lens, and the curvature radius R7 of the object side surface of the fourth lens satisfy: 2.15≤R7*d3m / (R6*d3s)≤2.60.

[0014] Furthermore, the at least one spacer element also includes a third spacer element located between the third lens and the fourth lens and in contact with the image-side surface of the third lens, and the curvature radius R5 of the object-side surface of the third lens and the outer diameter D3s of the object-side surface of the third spacer element satisfy: 0.98≤D3s / R5≤1.52.

[0015] Furthermore, the at least one spacer element also includes a fourth spacer element located between the fourth lens and the fifth lens and partially in contact with the image-side surface of the fourth lens, and an outer diameter D4s of the object-side surface of the fourth spacer element, an inner diameter d4s of the object-side surface of the fourth spacer element, a curvature radius R8 of the image-side surface of the fourth lens and a refractive index N4 of the fourth lens satisfy the following relationship: 4.06≤R8*N4 / (D4s-d4s)≤10.09.

[0016] Furthermore, a curvature radius R10 of the image-side surface of the fifth lens, an outer diameter D5s of the object-side surface of the fifth spacer, and an inner diameter d5s of the object-side surface of the fifth spacer satisfy the following relationship: -7.04≤R10 / (D5s-d5s)≤-2.44.

[0017] Furthermore, the at least one spacer element also includes a fourth spacer element located between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens, and the axial spacing EP45 between the fourth spacer element and the fifth spacer element and the air spacing T56 on the optical axis between the fifth lens and the sixth lens satisfy: 0.67≤EP45 / T56≤2.73.

[0018] Furthermore, the at least one spacer element also includes a sixth spacer element located between the sixth lens and the seventh lens and in contact with the image side surface of the sixth lens, and the curvature radius R11 of the object side surface of the sixth lens, the curvature radius R12 of the image side surface of the sixth lens, the outer diameter D5m of the image side surface of the fifth spacer element and the inner diameter d6s of the object side surface of the sixth spacer element satisfy the following: 1.13≤R12 / d6s / (R11 / D5m)≤1.63.

[0019] Furthermore, the at least one spacer element also includes a sixth spacer element located between the sixth lens and the seventh lens and in contact with the image-side surface portion of the sixth lens, and the maximum thickness CP6 of the sixth spacer element, the center thickness CT6 of the sixth lens on the optical axis, the air gap T67 between the sixth lens and the seventh lens on the optical axis, and the center thickness CT7 of the seventh lens on the optical axis satisfy the following: 1.47≤(CP6+CT6+T67) / CT7≤3.59.

[0020] Furthermore, the at least one spacer element also includes a sixth spacer element located between the sixth lens and the seventh lens and partially in contact with the image side surface of the sixth lens, and the curvature radius R13 of the object side surface of the seventh lens, the outer diameter D6m of the image side surface of the sixth spacer element, and the inner diameter d6m of the image side surface of the sixth spacer element satisfy the following: 1.16≤R13 / (D6m-d6m)≤2.74.

[0021] Furthermore, the maximum axial height L30 of the third lens barrel and the center thickness CT8 of the eighth lens on the optical axis satisfy the following relationship: 2.95≤L30 / CT8≤4.22.

[0022] Furthermore, the curvature radius R15 of the object-side surface of the eighth lens, the outer diameter D30s of the end surface of the second lens barrel closest to the object side, and the inner diameter d30s of the end surface of the second lens barrel closest to the object side satisfy: -2.84≤R15 / (D30s-d30s)≤-1.26.

[0023] Furthermore, the first lens has positive optical power, the third lens has negative optical power, the fourth lens has negative optical power, the fifth lens has positive optical power, and the eighth lens has negative optical power.

[0024] Furthermore, the object side surface of the first lens is convex, and the image side surface is concave; the object side surface of the second lens is convex; the object side surface of the third lens is convex, and the image side surface is concave; the object side surface of the fourth lens is convex, and the image side surface is concave; the object side surface of the fifth lens is convex, and the image side surface is convex; the object side surface of the sixth lens is concave, and the image side surface is convex; the object side surface of the seventh lens is convex, and the image side surface is concave; and the object side surface of the eighth lens is concave.

[0025] Applying the technical solution of the present invention, the optical imaging module of the present application is composed of at least one lens barrel, eight lenses arranged in the at least one lens barrel, and at least one spacer element. By reasonably arranging the positions of the eight lenses and the fifth spacer element and setting the optical imaging module to meet 2.11≤T34 / (T23+T45)≤2.94, the distribution of the second lens, the third lens, the fourth lens, and the fifth lens can be effectively adjusted so that the distribution of each lens meets the assembly requirements, which is beneficial to the subsequent imaging assembly process. However, in this case, the edge structure area of ​​the fifth lens is more likely to generate stray light. Therefore, the present application reasonably constrains the ratio between the effective focal length of the fifth lens and the inner diameter of the object side of the fifth spacer element by constraining 0.91≤f5 / d5s≤1.40, which is beneficial to reducing the stray light generated by the edge structure area of ​​the fifth lens, thereby weakening the impact of stray light on imaging quality and ensuring the imaging quality of the optical imaging module. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0027] Figure 1 A dimensioned diagram showing an optical imaging module according to an optional embodiment of the present invention is shown;

[0028] Figure 2 1-1 shows a schematic structural diagram of an optical imaging module according to embodiment 1 of the present invention;

[0029] Figure 3 Shows a schematic structural diagram of the optical imaging module of Examples 1-2 of the present utility model;

[0030] Figure 4 and Figure 5 The astigmatism curve and the distortion curve of the optical imaging module of the first embodiment of the present invention are respectively shown;

[0031] Figure 6 Schematic diagram showing the structure of the optical imaging module of Example 2-1 of the present utility model;

[0032] Figure 7 FIG2 shows a schematic structural diagram of an optical imaging module according to Example 2-2 of the present utility model;

[0033] Figure 8 and Figure 9 The astigmatism curve and the distortion curve of the optical imaging module of the second embodiment of the present utility model are respectively shown;

[0034] Figure 10 1 shows a schematic structural diagram of an optical imaging module according to embodiment 3-1 of the present invention;

[0035] Figure 11 Schematic diagram showing the structure of the optical imaging module of Example 3-2 of the present utility model;

[0036] Figure 12 and Figure 13 The astigmatism curve and the distortion curve of the optical imaging module of the third embodiment of the present utility model are shown respectively;

[0037] Figure 14 Schematic diagram showing the structure of the optical imaging module of Example 4-1 of the present utility model;

[0038] Figure 15 Schematic diagram showing the structure of the optical imaging module of Example 4-2 of the present utility model;

[0039] Figure 16 and Figure 17 The astigmatism curve and the distortion curve of the optical imaging module of the fourth embodiment of the present utility model are respectively shown;

[0040] Figure 18 The figure shows a light path diagram of an optical imaging module according to an optional embodiment of the present invention;

[0041] Figure 19 A schematic diagram of stray light when the optical imaging module of an optional embodiment of the present invention satisfies T34 / (T23+T45)=2.34 and f5 / d5s=1.31 is shown;

[0042] Figure 20 A schematic diagram of stray light when the optical imaging module of an optional embodiment of the present invention satisfies T34 / (T23+T45)=2.34 and f5 / d5s=0.81 is shown;

[0043] Figure 21A schematic diagram of stray light when an optical imaging module of an optional embodiment of the present invention satisfies T34 / (T23+T45)=2.34 and f5 / d5s=1.53 is shown.

[0044] The above drawings include the following reference numerals:

[0045] P10, first lens barrel; P20, second lens barrel; P30, third lens barrel; E1, first lens; S1, object-side surface of the first lens; S2, image-side surface of the first lens; E2, second lens; S3, object-side surface of the second lens; S4, image-side surface of the second lens; E3, third lens; S5, object-side surface of the third lens; S6, image-side surface of the third lens; E4, fourth lens; S7, object-side surface of the fourth lens; S8, image-side surface of the fourth lens; E5, fifth lens; S9, fifth lens object-side surface of the fifth lens; S10, image-side surface of the fifth lens; E6, sixth lens; S11, object-side surface of the sixth lens; S12, image-side surface of the sixth lens; E7, seventh lens; S13, object-side surface of the seventh lens; S14, image-side surface of the seventh lens; E8, eighth lens; S15, object-side surface of the eighth lens; S16, image-side surface of the eighth lens; P2, second spacer; P3, third spacer; P4, fourth spacer; P5, fifth spacer; P6, sixth spacer. DETAILED DESCRIPTION

[0046] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0047] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0048] In the present invention, unless otherwise specified, directional words such as "up, down, top, bottom" are usually used with reference to the directions shown in the drawings, or with reference to the components themselves in the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit the present invention.

[0049] It should be noted that in this specification, the terms "first," "second," "third," etc., are used solely to distinguish one feature from another and do not limit the features. Thus, the first lens discussed below could also be referred to as the second lens or the third lens without departing from the teachings of this application.

[0050] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0051] In this article, the paraxial area refers to the area near the optical axis. If the lens surface is convex and the convex surface position 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 concave surface position is not defined, it means that the lens surface is concave at least in the paraxial area. The judgment of the surface shape in the paraxial area can be based on the judgment method of ordinary knowledge in this field, and the positive and negative R values ​​(R refers to the radius of curvature of the paraxial area, usually refers to the R value on the lens database (lens data) in the optical software) are used to judge the convexity and concavity. In terms of the object side, when the R value is positive, it is judged to be convex, and when the R value is negative, it is judged to be concave; in terms of the image side, when the R value is positive, it is judged to be concave, and when the R value is negative, it is judged to be convex. In this application, the left side is the object side and the right side is the image side.

[0052] In order to solve the problem in the prior art that optical imaging modules have serious stray light caused by not meeting assembly requirements, the present utility model provides an optical imaging module.

[0053] like Figures 1 to 21 As shown, in an optional embodiment of the present application, the optical imaging module includes at least one lens barrel, eight lenses and at least one spacer element, the eight lenses and the at least one spacer element are arranged in the at least one lens barrel, and the eight lenses include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens in order from the object side to the image side; at least one spacer element includes a fifth spacer element, and the fifth spacer element is located between the fifth lens and the sixth lens and contacts the image side portion of the fifth lens; wherein, the air gap T23 on the optical axis between the second lens and the third lens, the air gap T34 on the optical axis between the third lens and the fourth lens, and the air gap T45 on the optical axis between the fourth lens and the fifth lens satisfy: 2.11≤T34 / (T23+T45)≤2.94; the effective focal length f5 of the fifth lens and the inner diameter d5s of the object side of the fifth spacer element satisfy: 0.91≤f5 / d5s≤1.40.

[0054] The optical imaging module of the present application is composed of at least one lens barrel, eight lenses arranged in the at least one lens barrel, and at least one spacer element. By reasonably arranging the positions of the eight lenses and the fifth spacer element and setting the optical imaging module to meet 2.11≤T34 / (T23+T45)≤2.94, the distribution of the second lens, the third lens, the fourth lens, and the fifth lens can be effectively adjusted so that the distribution of each lens meets the assembly requirements, which is beneficial to the subsequent imaging assembly process. However, in this case, the edge structure area of ​​the fifth lens is more likely to generate stray light. Therefore, the present application reasonably constrains the ratio between the effective focal length of the fifth lens and the inner diameter of the object side of the fifth spacer element by constraining 0.91≤f5 / d5s≤1.40, which is beneficial to reducing the stray light generated by the edge structure area of ​​the fifth lens, thereby weakening the impact of stray light on the imaging quality and ensuring the imaging quality of the optical imaging module.

[0055] It should be noted that each lens consists of a central optically active area and a peripheral structured area, with the peripheral structured area located outside and surrounding the central optically active area. The central optically active area is used for the passage of imaging light, while the peripheral structured area is not used for the passage of imaging light and is used for contact with the lens barrel, adjacent lenses, or adjacent spacer elements.

[0056] In addition, refer to Table 1 and Figures 18 to 21 As shown, Figure 18 The figure shows a schematic diagram of the optical path of the optical imaging module when T34 / (T23+T45)=2.34 is satisfied. Under the premise that the optical imaging module satisfies T34 / (T23+T45)=2.34, it can be seen from the figure that the edge structure area of ​​the fifth lens is more likely to generate stray light. Figure 19 The figure shows the stray light when the optical imaging module satisfies T34 / (T23+T45)=2.34 and f5 / d5s=1.31. Figure 20 The figure shows the stray light when the optical imaging module satisfies T34 / (T23+T45)=2.34 and f5 / d5s=0.81. Figure 21 A schematic diagram of stray light when the optical imaging module satisfies T34 / (T23+T45)=2.34 and f5 / d5s=1.53 is shown.

[0057] Depend on Figures 19 to 21It can be seen that when f5 / d5s=1.31 is satisfied, the stray light energy is weakened, the stray light is improved, and the performance is better. When f5 / d5s=0.81 is satisfied, the stray light energy is relatively strong, the stray light has a greater impact on the imaging quality, and the performance is poor. When f5 / d5s=1.53 is satisfied, the stray light energy is relatively strong, the stray light has a greater impact on the imaging quality, and the performance is poor. It can be seen that when f5 / d5s is in the range of 0.91 to 1.40, the stray light improvement effect of the optical imaging module is best. Therefore, the present application reasonably constrains the ratio between the effective focal length of the fifth lens and the inner diameter of the object side of the fifth spacer element by constraining 0.91≤f5 / d5s≤1.40, which is beneficial to reducing the stray light generated in the edge structure area of ​​the fifth lens, thereby weakening the impact of stray light on imaging quality and ensuring the imaging quality of the optical imaging module.

[0058]

[0059]

[0060] Table 1

[0061] In this embodiment, there are three lens barrels, which are, from the object side to the image side, the first lens barrel, the second lens barrel, and the third lens barrel, in order. The first lens is disposed in the first lens barrel, the second to seventh lenses are disposed in the second lens barrel, and the eighth lens is disposed in the third lens barrel. By providing three lens barrels and rationally arranging the lenses in each lens barrel, the spacing between two adjacent lens barrels can be adjusted as needed, enabling the optical imaging module of the present application to achieve clear focus imaging from infinity to macro distances. High-definition imaging at a close distance of 30 cm can be achieved by moving the second lens barrel. This satisfies the requirement that the optical imaging module simultaneously has the functions of a main camera and macro, eliminating the need for a mobile phone to carry a macro optical imaging module, and significantly saving space.

[0062] In addition, the at least one spacer element further includes a second spacer element located between the second lens and the third lens and abutting the image-side surface of the second lens, a third spacer element located between the third lens and the fourth lens and abutting the image-side surface of the third lens, a fourth spacer element located between the fourth lens and the fifth lens and abutting the image-side surface of the fourth lens, and a sixth spacer element located between the sixth lens and the seventh lens and abutting the image-side surface of the sixth lens. In an optional embodiment of the present application, the second spacer element may not be provided, that is, no spacer element is provided between the second lens and the third lens, and the second lens and the third lens directly bear against each other.

[0063] In this embodiment, the radius of curvature R1 of the object side surface of the first lens, the outer diameter D10s of the end surface of the first lens barrel closest to the object side, and the inner diameter d10s of the end surface of the first lens barrel closest to the object side satisfy the following relationship: 7.49 ≤ R1 / (D10s - d10s) ≤ 14.17. By controlling the ratio of the radius of curvature of the object side surface of the first lens to the difference between the inner and outer diameters of the first lens barrel on which it rests, the first lens barrel has a certain thickness. If this value is too small, the wall thickness of the first lens barrel will be too thin, thereby affecting the assembly stability. Due to the constraint of the radius of curvature of the object side surface of the first lens, light is smoothly transmitted to the group containing the second lens as quickly as possible after entering the optical system, achieving a pre-constraint of the optical power.

[0064] In this embodiment, the radius of curvature R2 of the image-side surface of the first lens, the radius of curvature R3 of the object-side surface of the second lens, the inner diameter d10m of the end surface of the first lens barrel closest to the image side, and the outer diameter D20s of the end surface of the second lens barrel closest to the object side satisfy the following relationship: 1.39 ≤ R2 * d10m / (R3 * D20s) ≤ 2.47. By controlling the product of the radius of curvature of a lens and the diameter of the lens barrel in which it resides, the optical imaging module can be minimized. By constraining the ratio of the product of the two different lenses, light can be smoothly transmitted between the different lenses, reducing the step difference between groups in different lens barrels, and achieving a clearer image quality reaching the image plane.

[0065] In this embodiment, the effective focal length f1 of the first lens, the center thickness CT1 of the first lens on the optical axis, and the maximum axial height L10 of the first lens barrel satisfy the following equation: 7.06 ≤ f1 / (CT1 + L10) ≤ 16.53. Controlling the ratio of the effective focal length of the first lens to the sum of the center thickness of the first lens on the optical axis and the maximum axial height of the first lens barrel is intended to rationally control light distribution and effectively improve the overall system's light focusing capability. In an optical system, the first lens is often crucial, responsible for the overall system's light focusing capability. By controlling this conditional equation, the system's front-end light distribution is optimized.

[0066] In this embodiment, the inner diameter d3s of the object-side surface of the third spacer element, the inner diameter d3m of the image-side surface of the third spacer element, the radius of curvature R6 of the image-side surface of the third lens, and the radius of curvature R7 of the object-side surface of the fourth lens satisfy the following relationship: 2.15 ≤ R7 * d3m / (R6 * d3s) ≤ 2.60. By controlling the ratio of the lens curvature radius to the aperture of the spacer element, the light within the lens group in the second lens barrel can be effectively constrained, achieving system miniaturization while also elevating the light so that it smoothly strikes the imaging surface. By constraining this ratio within a reasonable range, the problem of large step differences in the lens group in the second lens barrel due to large aperture differences can be effectively reduced, which helps ensure assembly stability.

[0067] In this embodiment, the radius of curvature R5 of the object-side surface of the third lens element and the outer diameter D3s of the object-side surface of the third spacer element satisfy the following relationship: 0.98 ≤ D3s / R5 ≤ 1.52. By properly controlling the ratio of the radius of curvature of the object-side surface of the third lens element to the outer diameter of the spacer element behind it, sufficient luminous flux is ensured when light passes through the lens group in the second lens barrel, ensuring illumination of the imaging surface and maintaining excellent image quality even during nighttime photography or in low-light environments.

[0068] In this embodiment, the outer diameter D4s of the object-side surface of the fourth spacer, the inner diameter d4s of the object-side surface of the fourth spacer, the radius of curvature R8 of the image-side surface of the fourth lens, and the refractive index N4 of the fourth lens satisfy the following relationship: 4.06 ≤ R8 * N4 / (D4s - d4s) ≤ 10.09. By properly controlling the product of the radius of curvature of the image-side surface of the fourth lens and the refractive index of the fourth lens, the fourth lens plays a role in optimizing chromatic aberration. By constraining the difference between this product and the inner and outer diameters of the fourth spacer, system miniaturization is maintained while maintaining appropriate assembly strength and adjusting system chromatic aberration. This ratio constraint achieves a certain balance.

[0069] In this embodiment, the radius of curvature R10 of the image-side surface of the fifth lens element, the outer diameter D5s of the object-side surface of the fifth spacer element, and the inner diameter d5s of the object-side surface of the fifth spacer element satisfy the following relationship: -7.04 ≤ R10 / (D5s - d5s) ≤ -2.44. Controlling the ratio of the radius of curvature of the image-side surface of the fifth lens element to the difference between the inner and outer diameters of the fifth spacer element helps ensure good assembly strength for the fifth lens, strikes a balance between increasing the lens's light-gathering capability and ensuring smooth assembly, ensures required assembly tolerances, and enhances system manufacturability.

[0070] In this embodiment, the axial spacing EP45 between the fourth and fifth spacer elements and the air spacing T56 between the fifth and sixth lenses on the optical axis satisfy the following relationship: 0.67 ≤ EP45 / T56 ≤ 2.73. By controlling the spacing between the spacer elements between the fourth and fifth lenses, the bearing strength of the waist dimensions of the lens group in the second lens barrel can be effectively guaranteed, significantly enhancing the manufacturability of the second lens barrel. Furthermore, by constraining the air spacing between specific lenses on the optical axis, a uniform distribution of the fifth and sixth lenses can be achieved, facilitating a rational arrangement of the structure.

[0071] In this embodiment, the radius of curvature R11 of the object-side surface of the sixth lens, the radius of curvature R12 of the image-side surface of the sixth lens, the outer diameter D5m of the image-side surface of the fifth spacer element, and the inner diameter d6s of the object-side surface of the sixth spacer element satisfy the following relationship: 1.13 ≤ R12 / d6s / (R11 / D5m) ≤ 1.63. By controlling the ratio of the radii of curvature of the fifth and sixth lenses, the distortion and field curvature of the entire system can be better balanced. Furthermore, combined with the ratio of the apertures of the spacer elements, this ensures that deformation is not easily prevented during assembly, significantly contributing to the stability of the field curvature. Therefore, controlling this conditional expression within a reasonable range helps ensure that the optical imaging module can achieve excellent imaging results.

[0072] In this embodiment, the maximum thickness CP6 of the sixth spacer element, the center thickness CT6 of the sixth lens on the optical axis, the air spacing T67 between the sixth and seventh lenses on the optical axis, and the center thickness CT7 of the seventh lens on the optical axis satisfy the following relationship: 1.47 ≤ (CP6 + CT6 + T67) / CT7 ≤ 3.59. By rationally controlling the center thickness and air spacing of specific lenses on the optical axis, and by combining this with the maximum thickness of the spacer element, the manufacturability of each lens in the system is guaranteed while achieving improved refractive power. Furthermore, the astigmatism and spherical aberration introduced by these lens groups are compensated, thereby improving overall image quality and achieving superior resolution.

[0073] In this embodiment, the radius of curvature R13 of the object-side surface of the seventh lens, the outer diameter D6m of the image-side surface of the sixth spacer element, and the inner diameter d6m of the image-side surface of the sixth spacer element satisfy the following relationship: 1.16 ≤ R13 / (D6m - d6m) ≤ 2.74. Controlling the ratio of the radius of curvature of the object-side surface of the seventh lens to the difference between the inner and outer diameters of the sixth spacer element helps ensure that the seventh lens can achieve good assembly strength, finding a balance between increasing the focusing ability of the seventh lens and forming assembly, ensuring the necessary assembly tolerances, and achieving system manufacturability. This lens is also the last lens in the second lens barrel. The above constraints enable smooth light tracing to the eighth lens in the third lens barrel, facilitating focusing.

[0074] In this embodiment, the maximum axial height L30 of the third barrel and the center thickness CT8 of the eighth lens on the optical axis satisfy the following relationship: 2.95 ≤ L30 / CT8 ≤ 4.22. By properly controlling the ratio of the maximum height of the third barrel to the center thickness of the eighth lens on the optical axis, the molding strength of the eighth lens can be effectively improved, the commissioning tolerance of the eighth lens can be effectively reduced, and the assembly of the lens can be improved. Furthermore, the independent grouping of the lenses, constrained by this ratio, ensures the stability of the rear end of the optical system, thereby improving the reliability of the entire system.

[0075] In this embodiment, the radius of curvature R15 of the object-side surface of the eighth lens, the outer diameter D30s of the end surface of the second lens barrel closest to the object side, and the inner diameter d30s of the end surface of the second lens barrel closest to the object side satisfy the following relationship: -2.84 ≤ R15 / (D30s - d30s) ≤ -1.26. By controlling the ratio of the radius of curvature of the object-side surface of the eighth lens to the difference between the inner and outer diameters of the end surface of the second lens barrel closest to the object side, the lens group in the second lens barrel achieves better assembly strength. At the same time, the light path between the lens group in the second lens barrel and the lens in the third lens barrel is smoothed, avoiding a steep rise in the light in the intermediate section, effectively reducing the generation of unnecessary stray light. Furthermore, by constraining the radius of curvature of the eighth lens, the necessary assembly tolerances can be ensured, achieving system manufacturability.

[0076] In this embodiment, the first lens has positive focal power, the third lens has negative focal power, the fourth lens has negative focal power, the fifth lens has positive focal power, and the eighth lens has negative focal power. The object side surface of the first lens is convex, and the image side surface is concave; the object side surface of the second lens is convex; the object side surface of the third lens is convex, and the image side surface is concave; the object side surface of the fourth lens is convex, and the image side surface is concave; the object side surface of the fifth lens is convex, and the image side surface is convex; the object side surface of the sixth lens is concave, and the image side surface is convex; the object side surface of the seventh lens is convex, and the image side surface is concave; and the object side surface of the eighth lens is concave. By reasonably constraining the focal power and surface shape of each lens, it is beneficial to reasonably constrain the light trend, ensure a smooth transition of light, correct aberrations, ensure imaging quality, and at the same time, it is beneficial for the optical imaging module to realize the functions of macro and main camera, ensuring the use effect.

[0077] Optionally, the optical imaging module in the embodiments of the present application can be simulated using software and / or tools such as ZEMAX and CODEV. Alternatively, the optical imaging module can be simulated using CODEV software. During the simulation using the aforementioned software and / or tools, the surface profile of each lens can be appropriately adjusted based on the surface profile of the software and / or tool used.

[0078] In addition, in another optional embodiment of the present application, an optical imaging module is also provided, which includes at least one lens barrel, eight lenses and at least one spacer element. The eight lenses and the at least one spacer element are arranged in the at least one lens barrel, and the eight lenses include, from the object side to the image side, a first lens with positive focal power, a second lens with optical focal power, a third lens with negative optical focal power, a fourth lens with negative optical focal power, a fifth lens with positive optical focal power, a sixth lens with optical focal power, a seventh lens with optical focal power and an eighth lens with negative optical focal power; the at least one spacer element includes a fifth spacer element, the fifth spacer element It is located between the fifth lens and the sixth lens and partially contacts the image-side surface of the fifth lens; wherein, an air gap T23 on the optical axis between the second lens and the third lens, an air gap T34 on the optical axis between the third lens and the fourth lens, and an air gap T45 on the optical axis between the fourth lens and the fifth lens satisfy the following relationship: 2.11≤T34 / (T23+T45)≤2.94; and a curvature radius R15 of the object-side surface of the eighth lens, an outer diameter D30s of the end surface of the second lens barrel closest to the object side, and an inner diameter d30s of the end surface of the second lens barrel closest to the object side satisfy the following relationship: -2.84≤R15 / (D30s-d30s)≤-1.26.

[0079] The optical imaging module of the present application is composed of at least one lens barrel and eight lenses and at least one spacer element arranged in the at least one lens barrel. By reasonably arranging the eight lenses, constraining the optical power of each lens, arranging the position of the fifth spacer element, and setting the optical imaging module to meet 2.11≤T34 / (T23+T45)≤2.94 and -2.84≤R15 / (D30s-d30s)≤-1.26, the distribution of the second lens, the third lens, the fourth lens, and the fifth lens can be effectively adjusted so that the distribution of each lens meets the assembly requirements, which is beneficial to the subsequent imaging assembly process. By controlling the ratio of the curvature radius of the object side of the eighth lens to the difference between the inner and outer diameters of the end face closest to the object side of the second lens barrel, it is beneficial to achieve better assembly strength of the lens group in the second lens barrel. At the same time, the smooth trend of light between the lens group in the second lens barrel and the lens in the third lens barrel is avoided, and the steep rise of light in the middle section is avoided, effectively reducing the generation of unnecessary stray light. At the same time, by constraining the curvature radius of the eighth lens, the necessary assembly tolerance can be ensured, thereby achieving the manufacturability of the system.

[0080] Of course, this embodiment may also include other parameter formulas in the above embodiment, which will not be described one by one here.

[0081] In addition, in another optional embodiment of the present application, an optical imaging module is further provided, comprising at least one lens barrel, eight lenses and at least one spacer element, wherein the eight lenses include, in order from the object side to the image side, a first lens with positive focal power, a second lens with optical power, a third lens with negative optical power, a fourth lens with negative optical power, a fifth lens with positive focal power, a sixth lens with optical power, a seventh lens with optical power and an eighth lens with negative optical power; there are three lens barrels, and the three lens barrels are, in order from the object side to the image side, a first lens barrel, a second lens barrel and a third lens barrel, the first lens is arranged in the first lens barrel, the second lens to the seventh lens are arranged in the second lens barrel, and the eighth lens is arranged in the third lens barrel. barrel; at least one spacer element includes a fourth spacer element located between the fourth lens and the fifth lens and in contact with the image side surface portion of the fourth lens, and a fifth spacer element located between the fifth lens and the sixth lens and in contact with the image side surface portion of the fifth lens; an outer diameter D10s of the end surface closest to the object side of the first lens barrel, an inner diameter d10s of the end surface closest to the object side of the first lens barrel, and a center thickness CT1 of the first lens on the optical axis satisfy: 0.68≤(D10s-d10s) / CT1≤1.13; an axial spacing EP45 between the fourth spacer element and the fifth spacer element and an inner diameter d4s of the object side surface of the fourth spacer element satisfy: 0.07≤EP45 / d4s≤0.09.

[0082] The optical imaging module of the present application consists of three lens barrels, eight lenses arranged in the three lens barrels, and at least one spacer element. By reasonably arranging the positions of the eight lenses, constraining the optical focal length of each lens, arranging the positions of the fourth and fifth spacer elements, and setting the optical imaging module to meet 0.68≤(D10s-d10s) / CT1≤1.13 and 0.07≤EP45 / d4s≤0.09, it is beneficial to ensure that the radial thickness of the first lens barrel is within a reasonable range, avoiding the risk of the first lens barrel being too thick or too thin, thereby affecting the assembly stability. At the same time, it is beneficial to ensure the matching degree between the first lens barrel and the first lens, ensuring that the light received by the first lens is not restricted by the first lens barrel, and ensuring the light utilization rate; controlling the ratio of the axial spacing between the fourth spacer element and the fifth spacer element and the inner diameter of the object side of the fourth spacer element is beneficial to reducing the stray light generated between the fourth lens and the fifth lens, and ensuring the imaging quality of the optical imaging module.

[0083] Of course, this embodiment may also include other parameter formulas in the above embodiment, which will not be described one by one here.

[0084] Optionally, the optical imaging module may further include a protective glass for protecting the photosensitive element located on the imaging surface.

[0085] The optical imaging module in the present application may use multiple lenses, such as the eight lenses mentioned above. In the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The characteristic of an aspherical lens is that the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After using an aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality.

[0086] However, those skilled in the art will appreciate that the number of lenses comprising the optical imaging module can be varied to achieve the various results and advantages described herein without departing from the technical solutions claimed herein. For example, although eight lenses are described in the embodiments, the optical imaging module is not limited to eight lenses. If desired, the optical imaging module may also include other numbers of lenses.

[0087] Figure 1 A schematic diagram of the dimensions of an optical imaging module of the present application is shown. Figure 1 Parameters such as D10s, d10m, d10s, D4s, D20s, D3s, d4s, d5s, D5s, d6s, d6m, D5m, D6m, d30s, D30s, EP45, L10, and CP6 are indicated to provide a clear and intuitive understanding of their significance. To facilitate the description of the optical imaging module and specific lens profiles, these parameters will not be reflected in the accompanying drawings when describing specific embodiments.

[0088] The following further describes examples of specific surface shapes and parameters of the optical imaging module applicable to the above-mentioned embodiments with reference to the accompanying drawings.

[0089] It should be noted that in the following Example 1, there are two examples, Example 1-1 and Example 1-2; in Example 2, there are two examples, Example 2-1 and Example 2-2; in Example 3, there are two examples, Example 3-1 and Example 3-2; and in Example 4, there are two examples, Example 4-1 and Example 4-2. While the parameters of the optical imaging module, such as the radius of curvature and center thickness of the first through eighth lenses, as well as the spacing between lenses and the higher-order coefficients, are the same in the two examples of the same embodiment, the parameters such as the thickness, inner diameter, and outer diameter of each lens barrel, the second through sixth spacer elements, and the shapes of some lenses are different. In other words, the main structure for imaging is the same, while the auxiliary structures for imaging are different.

[0090] It should be noted that any one of the following embodiments 1 to 4 is applicable to all embodiments of the present application.

[0091] Example 1

[0092] like Figures 2 to 5 As shown, the optical imaging module of embodiment 1 is described. Figure 2 shows a schematic structural diagram of the optical imaging module of Example 1-1, Figure 3 A schematic structural diagram of the optical imaging module of Example 1-2 is shown.

[0093] like Figure 2 and Figure 3 As shown, the optical imaging module includes three lens barrels, eight lenses, and multiple spacer elements. The three lens barrels are, from the object side to the image side, the first lens barrel P10, the second lens barrel P20, and the third lens barrel P30. The first lens barrel P10 is provided with the first lens E1. The second lens barrel P20 includes, from the object side to the image side, the second lens E2, the second spacer element P2, the third lens E3, the third spacer element P3, the fourth lens E4, the fourth spacer element P4, the fifth lens E5, the fifth spacer element P5, the sixth lens E6, the sixth spacer element P6, and the seventh lens E7. The third lens barrel P30 is provided with the eighth lens E8.

[0094] like Figure 2 1-1. The structure diagram of the optical imaging module of embodiment 1-1 is shown in FIG. In this example, the object-side surface S1 of the first lens element partially abuts the first lens barrel P10. The object-side surface S3 of the second lens element partially abuts the second lens barrel P20. The object-side surface and image-side surface of the second spacer element P2 partially abut the image-side surface S4 of the second lens element and the object-side surface S5 of the third lens element, respectively. The object-side surface and image-side surface of the third spacer element P3 partially abut the image-side surface S6 of the third lens element and the object-side surface S7 of the fourth lens element, respectively. The object-side surface and image-side surface of the fourth spacer element P4 partially abut the image-side surface S8 of the fourth lens element and the object-side surface S9 of the fifth lens element, respectively. The object-side surface and image-side surface of the fifth spacer element P5 partially abut the image-side surface S10 of the fifth lens element and the object-side surface S11 of the sixth lens element, respectively. The object-side surface and image-side surface of the sixth spacer element P6 partially abut the image-side surface S12 of the sixth lens element and the object-side surface S13 of the seventh lens element, respectively. The object-side surface of the eighth lens partially abuts the third lens barrel P30.

[0095] like Figure 3 FIG2 is a schematic diagram of the structure of the optical imaging module of Example 1-2. In this example, the supporting and abutting manner of each spacer element is the same as that of Example 1-1, and the relevant description in Example 1-1 can be referred to and will not be repeated here.

[0096] In summary, the structural parameters of the optical imaging module of Example 1 in Example 1-1 and Example 1-2 are shown in Table 2.

[0097] (Unit: mm)

[0098] Parameters / Example 1-1 1-2 D3s(mm) 8.300 8.498 d4s(mm) 7.438 7.440 D4s(mm) 9.400 10.460 d5s(mm) 8.363 8.180 D5s(mm) 9.980 11.200 D5m(mm) 10.976 11.200 d6s(mm) 10.016 9.570 d6m(mm) 10.450 9.570 D6m(mm) 12.099 12.450 d10s(mm) 9.582 9.580 d10m(mm) 10.140 10.138 D10s(mm) 10.500 10.496 D20s(mm) 8.600 8.660 d30s(mm) 14.369 14.370 D30s(mm) 17.200 17.300 CP6(mm) 1.490 0.020 EP45(mm) 0.570 0.570 L10(mm) 1.800 1.800 L30(mm) 3.350 3.350 d3s(mm) 6.000 6.112 d3m(mm) 6.000 6.112

[0099] Table 2

[0100] In Example 1, the object-side surface S1 of the first lens is convex, and the image-side surface S2 of the first lens is concave. The object-side surface S3 of the second lens is convex, and the image-side surface S4 of the second lens is convex. The object-side surface S5 of the third lens is convex, and the image-side surface S6 of the third lens is concave. The object-side surface S7 of the fourth lens is convex, and the image-side surface S8 of the fourth lens is concave. The object-side surface S9 of the fifth lens is convex, and the image-side surface S10 of the fifth lens is convex. The object-side surface S11 of the sixth lens is concave, and the image-side surface S12 of the sixth lens is convex. The object-side surface S13 of the seventh lens is convex, and the image-side surface S14 of the seventh lens is concave. The object-side surface S15 of the eighth lens is concave, and the image-side surface S16 of the eighth lens is concave.

[0101] In Example 1, the effective focal length f1 of the first lens is 30.92 mm, the effective focal length f2 of the second lens is 14.58 mm, the effective focal length f3 of the third lens is -13.77 mm, the effective focal length f4 of the fourth lens is -44.48 mm, the effective focal length f5 of the fifth lens is 10.99 mm, the effective focal length f6 of the sixth lens is -227.51 mm, the effective focal length f7 of the seventh lens is 29.88 mm, and the effective focal length f8 of the eighth lens is -10.54 mm.

[0102] Table 3 shows the basic structural parameters of the optical imaging module of Example 1, wherein the units of curvature radius and thickness / distance are all millimeters.

[0103]

[0104] Table 3

[0105] In Example 1, the object-side surface and the image-side surface of the first lens E1 to the eighth lens E8 are all aspherical surfaces. The surface shape of each aspherical lens can be defined by, but not limited to, the following aspherical surface formula:

[0106]

[0107] Where x is the distance vector from the vertex of the aspheric surface 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 radius of curvature R in Table 1 above; k is the conic coefficient; and Ai is the correction coefficient for the i-th order of the aspheric surface. Table 4 below lists the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for each aspheric mirror surface S1-S16 in Example 1.

[0108] Face number A4 A6 A8 A10 A12 A14 A16 S1 -1.0926E-01 -1.8723E-02 -3.6179E-03 -4.1135E-04 -3.4051E-05 2.0989E-05 -7.2441E-06 S2 -1.2222E-01 -1.9818E-02 -3.1520E-03 7.1319E-05 5.1285E-06 3.5638E-05 -2.7832E-05 S3 -3.6241E-02 -1.0328E-02 -7.5944E-04 7.8765E-04 5.9453E-04 2.7110E-04 9.7248E-05 S4 -7.7808E-02 5.6024E-03 -4.0678E-03 3.5889E-03 -5.4910E-04 7.5704E-04 -3.0727E-04 S5 -5.5771E-01 6.3927E-02 -1.4731E-02 5.0082E-03 -1.0925E-03 5.8417E-04 -4.0821E-04 S6 -5.4392E-01 3.2884E-02 -1.1084E-02 1.7961E-03 -3.8042E-04 1.7284E-04 -1.3818E-04 S7 -4.0380E-01 -1.9375E-02 -4.5859E-03 3.4679E-04 -4.7093E-04 2.2142E-04 -4.1095E-05 S8 -7.9185E-01 3.9418E-02 -6.4144E-03 3.7145E-03 -1.6835E-03 1.2390E-03 -2.4143E-04 S9 -3.9285E-01 5.9980E-02 -9.9294E-03 5.5326E-03 -2.9968E-04 1.3885E-03 -1.8969E-04 S10 -6.7915E-01 1.8092E-02 -3.0605E-04 5.1439E-03 5.1068E-03 1.3872E-03 1.8836E-03 S11 1.7883E+00 -4.3866E-02 9.6800E-02 -3.7072E-02 7.2324E-03 -4.8572E-03 3.7181E-03 S12 7.2216E-01 -1.5741E-02 6.9697E-02 -1.6346E-02 8.6967E-05 -4.7197E-03 2.3943E-03 S13 -3.8458E+00 2.6104E-02 2.8278E-03 3.6846E-02 1.7202E-03 2.4619E-03 -2.1117E-04 S14 -3.5345E+00 3.3133E-01 3.7345E-02 -3.5748E-03 -3.9681E-03 4.3876E-03 -2.4137E-03 S15 1.3032E+00 2.8603E-01 -1.4426E-01 1.2145E-02 5.9631E-03 -5.5599E-03 4.4477E-04 S16 -1.6907E+00 1.7780E-01 -7.2923E-02 -1.2917E-02 -1.6404E-02 -5.2339E-03 -1.2075E-03 Face number A18 A20 A22 A24 A26 A28 A30 S1 -4.1206E-06 -5.5713E-07 -9.1509E-07 5.7627E-06 2.8503E-06 6.7174E-07 -2.3502E-06 S2 9.5306E-06 -3.9306E-06 7.8465E-06 3.3969E-06 2.7116E-06 -3.3391E-06 -2.1618E-07 S3 9.8341E-05 5.4929E-05 3.2718E-05 1.5339E-05 1.0703E-05 3.2274E-07 7.1505E-07 S4 4.1887E-04 -1.4756E-04 1.1758E-04 -5.2012E-05 3.9154E-05 -7.5892E-06 1.5305E-05 S5 3.4945E-04 -1.5048E-04 8.4126E-05 -4.0604E-05 1.8385E-05 -1.1106E-05 8.6501E-06 S6 7.4489E-05 -2.1762E-05 1.1340E-05 1.6471E-06 4.6448E-06 -1.0682E-06 -1.6172E-06 S7 2.5074E-05 7.5685E-06 2.0617E-05 4.1424E-06 3.4411E-06 -8.4652E-07 1.7179E-06 S8 -9.5273E-05 -2.1037E-04 -1.3595E-04 -1.1484E-04 -4.7295E-05 -1.8017E-05 2.6399E-06 S9 -3.7241E-04 -2.3122E-04 -6.2967E-05 -5.9589E-05 -1.1536E-05 6.3893E-06 1.2868E-05 S10 3.5226E-04 8.0075E-05 1.7725E-04 6.4442E-05 1.0293E-04 5.5555E-05 2.6061E-05 S11 -1.8984E-03 8.3154E-04 -4.3675E-05 -8.0882E-05 -9.4591E-06 -2.5931E-05 1.5724E-05 S12 -1.2520E-03 4.2774E-04 -7.3433E-05 6.0673E-05 -5.8448E-05 -3.2247E-05 -2.7850E-05 S13 -1.4198E-03 -8.1327E-04 -2.6525E-04 8.2233E-07 3.8067E-05 6.8866E-05 -2.2942E-05 S14 3.4143E-04 -4.3321E-04 3.3419E-04 -3.7163E-04 2.3292E-04 -1.4792E-04 6.7304E-05 S15 1.1259E-03 -9.9508E-04 4.5566E-04 -2.8766E-05 -2.1072E-04 4.8826E-06 4.3165E-05 S16 2.2220E-03 -1.2049E-03 1.0919E-03 5.2187E-04 3.7487E-04 2.2128E-04 1.1795E-04

[0109] Table 4

[0110] Figure 4 The astigmatism curve of the optical imaging module of the first embodiment is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 5 The distortion curve of the optical imaging module of the first embodiment is shown, which represents the distortion magnitude values ​​corresponding to different field angles.

[0111] according to Figure 4 and Figure 5 It can be seen that the optical imaging module provided in the first embodiment can achieve good imaging quality.

[0112] Example 2

[0113] like Figures 6 to 9 As shown, the optical imaging module of embodiment 2 is described. Figure 6 shows a schematic structural diagram of the optical imaging module of Example 2-1, Figure 7 A structural schematic diagram of the optical imaging module of Example 2-2 is shown.

[0114] like Figure 6 and Figure 7 As shown, the optical imaging module includes three lens barrels, eight lenses, and multiple spacer elements. The three lens barrels are, from the object side to the image side, the first lens barrel P10, the second lens barrel P20, and the third lens barrel P30. The first lens barrel P10 is provided with the first lens E1. The second lens barrel P20 includes, from the object side to the image side, the second lens E2, the third lens E3, the third spacer element P3, the fourth lens E4, the fourth spacer element P4, the fifth lens E5, the fifth spacer element P5, the sixth lens E6, the sixth spacer element P6, and the seventh lens E7. The third lens barrel P30 is provided with the eighth lens E8.

[0115] like Figure 62-1. The structure diagram of the optical imaging module of embodiment 2-1 is shown in FIG. In this example, the object-side surface S1 of the first lens element partially abuts the first lens barrel P10. The object-side surface S3 of the second lens element partially abuts the second lens barrel P20. The image-side surface S4 of the second lens element partially abuts the object-side surface S5 of the third lens element. The object-side surface and image-side surface of the third spacer element P3 partially abut the image-side surface S6 of the third lens element and the object-side surface S7 of the fourth lens element, respectively. The object-side surface and image-side surface of the fourth spacer element P4 partially abut the image-side surface S8 of the fourth lens element and the object-side surface S9 of the fifth lens element, respectively. The object-side surface and image-side surface of the fifth spacer element P5 partially abut the image-side surface S10 of the fifth lens element and the object-side surface S11 of the sixth lens element, respectively. The object-side surface and image-side surface of the sixth spacer element P6 partially abut the image-side surface S12 of the sixth lens element and the object-side surface S13 of the seventh lens element, respectively. The object-side surface of the eighth lens partially abuts the third lens barrel P30.

[0116] like Figure 7 FIG2 is a schematic diagram of the structure of the optical imaging module of Example 2-2. In this example, the supporting and abutting manner of each spacer element is the same as that of Example 2-1. Please refer to the relevant description of Example 2-1 and will not be repeated here.

[0117] In summary, the structural parameters of the optical imaging module of the second embodiment in embodiments 2-1 and 2-2 are shown in Table 5.

[0118] (Unit: mm)

[0119]

[0120]

[0121] Table 5

[0122] In Example 2, the object-side surface S1 of the first lens is convex, and the image-side surface S2 of the first lens is concave. The object-side surface S3 of the second lens is convex, and the image-side surface S4 of the second lens is convex. The object-side surface S5 of the third lens is convex, and the image-side surface S6 of the third lens is concave. The object-side surface S7 of the fourth lens is convex, and the image-side surface S8 of the fourth lens is concave. The object-side surface S9 of the fifth lens is convex, and the image-side surface S10 of the fifth lens is convex. The object-side surface S11 of the sixth lens is concave, and the image-side surface S12 of the sixth lens is convex. The object-side surface S13 of the seventh lens is convex, and the image-side surface S14 of the seventh lens is concave. The object-side surface S15 of the eighth lens is concave, and the image-side surface S16 of the eighth lens is concave.

[0123] In Example 2, the effective focal length f1 of the first lens is 29.83 mm, the effective focal length f2 of the second lens is 14.70 mm, the effective focal length f3 of the third lens is -13.69 mm, the effective focal length f4 of the fourth lens is -40.15 mm, the effective focal length f5 of the fifth lens is 10.99 mm, the effective focal length f6 of the sixth lens is 1800.00 mm, the effective focal length f7 of the seventh lens is 32.40 mm, and the effective focal length f8 of the eighth lens is -10.22 mm.

[0124] Table 6 shows the basic structural parameters of the optical imaging module of Example 2, wherein the units of curvature radius and thickness / distance are all millimeters.

[0125]

[0126] Table 6

[0127] Table 7 below lists the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 of the aspheric mirror surfaces S1-S16 in Example 2. The surface shape of each aspheric surface can be defined by formula (1) given in Example 1 above.

[0128] Face number A4 A6 A8 A10 A12 A14 A16 S1 -1.0948E-01 -1.9485E-02 -3.2618E-03 -5.1272E-04 2.5528E-05 -1.2355E-05 1.2892E-05 S2 -1.2352E-01 -2.1001E-02 -2.5375E-03 -1.4293E-04 1.0029E-04 -2.8602E-05 8.8198E-06 S3 -3.3324E-02 -1.1557E-02 -6.4222E-04 6.9165E-04 5.1763E-04 2.3933E-04 9.5283E-05 S4 -8.0263E-02 4.3111E-03 -2.9811E-03 3.0046E-03 -4.5871E-04 6.5181E-04 -2.3610E-04 S5 -5.6981E-01 6.5337E-02 -1.3753E-02 4.5408E-03 -1.0286E-03 5.1567E-04 -3.5069E-04 S6 -5.5728E-01 3.3059E-02 -1.1067E-02 1.7098E-03 -4.0605E-04 1.3063E-04 -1.3833E-04 S7 -4.0123E-01 -1.9659E-02 -4.0269E-03 3.8030E-04 -5.3983E-04 1.5912E-04 -1.2304E-04 S8 -7.7294E-01 3.8887E-02 -6.2389E-03 3.3466E-03 -1.1676E-03 1.2756E-03 -2.6757E-04 S9 -3.7704E-01 5.7390E-02 -1.1340E-02 5.2510E-03 7.3206E-04 1.3846E-03 -4.2230E-04 S10 -6.6841E-01 2.2241E-02 -2.2704E-03 4.2274E-03 4.7046E-03 1.2812E-03 1.7382E-03 S11 1.6905E+00 -4.5576E-02 9.0280E-02 -3.2449E-02 5.4242E-03 -4.9475E-03 3.3331E-03 S12 7.2318E-01 -2.7285E-02 7.2853E-02 -1.4324E-02 7.5110E-04 -5.6962E-03 2.4051E-03 S13 -3.6309E+00 6.7564E-03 6.9803E-03 2.8952E-02 1.8790E-03 4.6893E-04 9.4834E-04 S14 -3.3792E+00 3.2255E-01 3.0508E-02 -3.3036E-03 -5.2739E-03 4.2220E-03 -1.6344E-03 S15 1.1955E+00 2.9521E-01 -1.2141E-01 1.1253E-02 5.9303E-03 -3.3967E-03 -6.0599E-04 S16 -1.7279E+00 1.8370E-01 -9.2551E-02 5.0994E-03 -1.5338E-02 2.0580E-04 -4.3146E-03 Face number A18 A20 A22 A24 A26 A28 A30 S1 -1.7142E-05 6.7504E-06 -8.7898E-06 6.3189E-06 2.1662E-06 1.8085E-06 -2.0740E-06 S2 -1.7784E-05 1.2194E-05 -5.7435E-06 1.2587E-05 -1.9492E-06 1.1949E-06 -4.5343E-06 S3 1.0714E-04 6.4864E-05 4.6850E-05 2.7463E-05 1.8930E-05 3.3255E-06 2.1313E-06 S4 3.9486E-04 -1.1092E-04 1.1799E-04 -3.2197E-05 3.7269E-05 1.5809E-07 1.3243E-05 S5 3.2963E-04 -1.3818E-04 7.7528E-05 -3.4420E-05 1.5018E-05 -6.8203E-06 9.6221E-06 S6 7.0146E-05 -2.2608E-05 8.6612E-06 6.8037E-07 2.4686E-06 7.6132E-07 -1.3690E-06 S7 -5.6668E-06 -1.7723E-05 1.4322E-05 -3.0869E-06 5.3703E-06 -2.3114E-06 1.8863E-06 S8 3.2064E-05 -8.3691E-05 -8.1803E-05 -1.0763E-04 -4.8517E-05 -2.0565E-05 -6.6510E-07 S9 -3.3407E-04 -1.6746E-04 -9.4698E-05 -8.4273E-05 -2.9616E-06 1.9438E-05 1.2945E-05 S10 3.4334E-04 -1.3214E-04 -4.0460E-05 -1.2596E-04 -2.6808E-05 -4.3221E-06 3.6281E-06 S11 -1.8836E-03 4.7914E-04 1.9178E-04 2.1688E-05 5.5697E-05 -3.7065E-05 1.0545E-05 S12 -1.4169E-03 2.0619E-04 -1.2381E-04 1.5333E-04 6.3722E-05 4.4348E-05 -3.2657E-06 S13 -9.6022E-04 -4.4942E-04 -2.9944E-04 -4.5044E-06 -5.2738E-06 5.9668E-05 -2.3518E-05 S14 3.1979E-04 -4.2089E-04 4.4585E-04 -3.7682E-04 2.2898E-04 -1.3822E-04 5.3101E-05 S15 1.4553E-03 -1.1253E-03 3.6677E-04 -7.3006E-06 -1.1004E-04 -1.6731E-05 2.6698E-05 S16 2.6794E-03 -2.6298E-03 8.2308E-04 -3.9352E-04 4.3197E-05 -1.0977E-04 4.1788E-05

[0129] Table 7

[0130] Figure 8 The astigmatism curve of the optical imaging module of the second embodiment is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 9 The distortion curve of the optical imaging module of the second embodiment is shown, which represents the distortion magnitude values ​​corresponding to different field angles.

[0131] according to Figure 8 and Figure 9 It can be seen that the optical imaging module provided in the second embodiment can achieve good imaging quality.

[0132] Example 3

[0133] like Figures 10 to 13 As shown, the optical imaging module of embodiment three is described. Figure 10 shows a schematic structural diagram of the optical imaging module of Example 3-1, Figure 11 A schematic structural diagram of the optical imaging module of Example 3-2 is shown.

[0134] like Figure 10 and Figure 11As shown, the optical imaging module includes three lens barrels, eight lenses, and multiple spacer elements. The three lens barrels are, from the object side to the image side, the first lens barrel P10, the second lens barrel P20, and the third lens barrel P30. The first lens barrel P10 is provided with the first lens E1. The second lens barrel P20 includes, from the object side to the image side, the second lens E2, the second spacer element P2, the third lens E3, the third spacer element P3, the fourth lens E4, the fourth spacer element P4, the fifth lens E5, the fifth spacer element P5, the sixth lens E6, the sixth spacer element P6, and the seventh lens E7. The third lens barrel P30 is provided with the eighth lens E8.

[0135] like Figure 10 , is a schematic structural diagram of the optical imaging module of Example 3-1. In this example, the object-side surface S1 of the first lens partially abuts the first lens barrel P10. The object-side surface S3 of the second lens partially abuts the second lens barrel P20. The object-side surface and image-side surface of the second spacer element P2 partially abut the image-side surface S4 of the second lens and the object-side surface S5 of the third lens, respectively. The object-side surface and image-side surface of the third spacer element P3 partially abut the image-side surface S6 of the third lens and the object-side surface S7 of the fourth lens, respectively. The object-side surface and image-side surface of the fourth spacer element P4 partially abut the image-side surface S8 of the fourth lens and the object-side surface S9 of the fifth lens, respectively. The object-side surface and image-side surface of the fifth spacer element P5 partially abut the image-side surface S10 of the fifth lens and the object-side surface S11 of the sixth lens, respectively. The object-side surface and image-side surface of the sixth spacer element P6 partially abut the image-side surface S12 of the sixth lens and the object-side surface S13 of the seventh lens, respectively. The object-side surface of the eighth lens partially abuts the third lens barrel P30.

[0136] like Figure 11 FIG3 is a schematic diagram of the structure of the optical imaging module of Example 3-2. In this example, the supporting and abutting manner of each spacer element is the same as that of Example 3-1. Please refer to the relevant description of Example 3-1 and will not be repeated here.

[0137] In summary, the structural parameters of the optical imaging module of Example 3 in Example 3-1 and Example 3-2 are shown in Table 8.

[0138] (Unit: mm)

[0139]

[0140]

[0141] Table 8

[0142] In Example 3, the object-side surface S1 of the first lens is convex, and the image-side surface S2 of the first lens is concave. The object-side surface S3 of the second lens is convex, and the image-side surface S4 of the second lens is concave. The object-side surface S5 of the third lens is convex, and the image-side surface S6 of the third lens is concave. The object-side surface S7 of the fourth lens is convex, and the image-side surface S8 of the fourth lens is concave. The object-side surface S9 of the fifth lens is convex, and the image-side surface S10 of the fifth lens is convex. The object-side surface S11 of the sixth lens is concave, and the image-side surface S12 of the sixth lens is convex. The object-side surface S13 of the seventh lens is convex, and the image-side surface S14 of the seventh lens is concave. The object-side surface S15 of the eighth lens is concave, and the image-side surface S16 of the eighth lens is concave.

[0143] In Example 3, the effective focal length f1 of the first lens is 42.99 mm, the effective focal length f2 of the second lens is 16.10 mm, the effective focal length f3 of the third lens is -18.90 mm, the effective focal length f4 of the fourth lens is -86.76 mm, the effective focal length f5 of the fifth lens is 10.08 mm, the effective focal length f6 of the sixth lens is -1800.02 mm, the effective focal length f7 of the seventh lens is -1000.00 mm, and the effective focal length f8 of the eighth lens is -13.35 mm.

[0144] Table 9 shows the basic structural parameters of the optical imaging module of Example 3, wherein the units of curvature radius and thickness / distance are all millimeters.

[0145]

[0146] Table 9

[0147] Table 10 below lists the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 of the aspheric mirror surfaces S1-S16 in Example 3. The surface shape of each aspheric surface can be defined by formula (1) given in Example 1 above.

[0148] Face number A4 A6 A8 A10 A12 A14 A16 S1 -1.5430E-01 -2.6567E-02 -4.0847E-03 -6.4676E-04 9.9765E-05 -1.3876E-05 1.5279E-05 S2 -1.5959E-01 -2.7612E-02 -2.7381E-03 -4.0135E-04 2.7577E-04 -8.6546E-05 3.8693E-05 S3 -2.7088E-02 -1.9665E-02 -1.3311E-03 1.1997E-04 5.3437E-04 2.1216E-04 1.3324E-04 S4 -9.0121E-02 4.5982E-03 -4.6188E-03 3.9831E-03 -1.5572E-03 1.5278E-03 -7.1037E-04 S5 -6.2480E-01 7.0778E-02 -1.5323E-02 5.4297E-03 -2.4378E-03 1.4014E-03 -7.8641E-04 S6 -6.4332E-01 3.8998E-02 -1.0633E-02 3.2994E-03 -3.9591E-04 5.9487E-04 -8.1606E-05 S7 -4.5746E-01 -2.3832E-02 -3.5372E-03 1.8047E-03 3.8088E-04 4.0322E-04 6.6241E-05 S8 -7.1889E-01 1.9886E-02 -3.3386E-03 -3.2145E-04 -1.5751E-03 3.3697E-04 -1.3041E-04 S9 -3.1388E-01 4.6599E-02 -2.9258E-03 -4.1776E-04 2.6165E-04 1.0664E-03 -6.9171E-05 S10 -5.1851E-01 1.9603E-02 -1.6075E-03 2.0761E-03 3.7612E-03 2.3581E-04 6.6211E-04 S11 9.4015E-01 -5.6845E-02 4.9369E-02 -1.3320E-02 3.1867E-03 -3.5521E-03 9.1375E-04 S12 6.2922E-01 -1.1149E-01 5.2016E-02 -1.2255E-02 3.8671E-03 -2.8189E-03 1.2161E-03 S13 -2.8819E+00 -2.4544E-02 -8.1161E-03 1.5563E-02 4.9026E-03 1.2182E-03 9.1883E-04 S14 -3.6302E+00 4.0029E-01 -4.2609E-02 1.8269E-02 -9.0320E-03 5.4338E-03 -2.8367E-03 S15 7.1092E-01 5.0336E-01 -1.7203E-01 1.8242E-02 1.0301E-02 -1.0524E-02 4.1856E-03 S16 -2.0866E+00 3.6977E-01 -8.3669E-03 -2.7625E-02 9.8675E-03 -1.5454E-02 7.8265E-03 Face number A18 A20 A22 A24 A26 A28 A30 S1 -2.9713E-05 6.7433E-06 -6.5375E-06 1.2443E-05 3.0201E-06 -1.6384E-06 -1.4543E-06 S2 -4.8629E-05 2.5332E-05 -2.0000E-05 1.5278E-05 -5.9544E-06 7.9058E-06 -3.4762E-06 S3 8.7438E-05 1.0168E-04 5.8197E-05 4.1004E-05 1.7669E-05 1.5768E-05 2.9732E-06 S4 6.7571E-04 -1.5648E-04 2.2477E-04 -7.1972E-05 5.9396E-05 -1.8531E-05 1.9444E-05 S5 5.2524E-04 -1.5227E-04 1.4193E-04 -6.0312E-05 2.9770E-05 -1.4241E-05 1.2697E-05 S6 1.3874E-04 5.0032E-05 4.6114E-05 2.1028E-05 8.8681E-06 5.9098E-06 7.4140E-07 S7 4.6852E-05 3.6387E-05 5.6023E-05 3.2602E-05 2.4432E-05 1.2730E-05 1.1064E-05 S8 1.9964E-04 2.8558E-04 7.7503E-05 -1.3248E-04 -9.7859E-05 -8.5853E-06 1.2812E-05 S9 1.1923E-04 1.6984E-04 -6.8260E-05 -2.5217E-04 -7.9381E-05 6.2174E-05 5.1476E-05 S10 2.1434E-04 -3.5423E-04 2.8762E-05 -2.1061E-04 -2.0795E-05 -6.5464E-05 -3.6204E-06 S11 -2.0326E-04 -2.8325E-04 2.4764E-04 -7.7731E-05 1.5464E-04 -5.5075E-06 4.4448E-05 S12 -2.6482E-04 4.5808E-05 1.3110E-04 2.0848E-05 1.1493E-04 8.8781E-06 4.8294E-05 S13 -5.1482E-04 -8.2701E-05 -1.4682E-04 4.4186E-05 9.8599E-06 2.1104E-05 -3.3782E-05 S14 1.3450E-03 -7.4143E-04 4.9274E-04 -3.0281E-04 1.6470E-04 -1.0837E-04 5.8555E-05 S15 -2.6633E-03 1.3542E-03 -1.5154E-03 1.0770E-03 -6.6085E-04 1.2706E-04 -5.9904E-05 S16 -5.0668E-03 3.1320E-03 -2.7375E-03 9.5069E-04 -3.7074E-04 8.5740E-05 3.3717E-05

[0149] Table 10

[0150] Figure 12 The astigmatism curve of the optical imaging module of the third embodiment is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 13 The distortion curve of the optical imaging module of the third embodiment is shown, which represents the distortion magnitude values ​​corresponding to different field angles.

[0151] according to Figure 12 and Figure 13 It can be seen that the optical imaging module provided in the third embodiment can achieve good imaging quality.

[0152] Example 4

[0153] like Figures 14 to 17 As shown, the optical imaging module of embodiment 4 is described. Figure 14 shows a schematic structural diagram of the optical imaging module of Example 4-1, Figure 15 A schematic structural diagram of the optical imaging module of Example 4-2 is shown.

[0154] like Figure 14 and Figure 15 As shown, the optical imaging module includes three lens barrels, eight lenses, and multiple spacer elements. The three lens barrels are, from the object side to the image side, the first lens barrel P10, the second lens barrel P20, and the third lens barrel P30. The first lens barrel P10 is provided with the first lens E1. The second lens barrel P20 includes, from the object side to the image side, the second lens E2, the second spacer element P2, the third lens E3, the third spacer element P3, the fourth lens E4, the fourth spacer element P4, the fifth lens E5, the fifth spacer element P5, the sixth lens E6, the sixth spacer element P6, and the seventh lens E7. The third lens barrel P30 is provided with the eighth lens E8.

[0155] like Figure 14 4-1. The structure diagram of the optical imaging module of Example 4-1 is shown in FIG. 4-1. In this example, the object-side surface S1 of the first lens partially abuts the first lens barrel P10. The object-side surface S3 of the second lens partially abuts the second lens barrel P20. The object-side surface and image-side surface of the second spacer element P2 partially abut the image-side surface S4 of the second lens and the object-side surface S5 of the third lens, respectively. The object-side surface and image-side surface of the third spacer element P3 partially abut the image-side surface S6 of the third lens and the object-side surface S7 of the fourth lens, respectively. The object-side surface and image-side surface of the fourth spacer element P4 partially abut the image-side surface S8 of the fourth lens and the object-side surface S9 of the fifth lens, respectively. The object-side surface and image-side surface of the fifth spacer element P5 partially abut the image-side surface S10 of the fifth lens and the object-side surface S11 of the sixth lens, respectively. The object-side surface and image-side surface of the sixth spacer element P6 partially abut the image-side surface S12 of the sixth lens and the object-side surface S13 of the seventh lens, respectively. The object-side surface of the eighth lens partially abuts the third lens barrel P30.

[0156] like Figure 15 FIG4 is a schematic diagram of the structure of the optical imaging module of Example 4-2. In this example, the supporting and abutting manner of each spacer element is the same as that of Example 4-1. Please refer to the relevant description of Example 4-1 and will not be repeated here.

[0157] In summary, the structural parameters of the optical imaging module of Example 4 in Example 4-1 and Example 4-2 are shown in Table 11.

[0158] (Unit: mm)

[0159]

[0160]

[0161] Table 11

[0162] In Example 4, the object-side surface S1 of the first lens is convex, and the image-side surface S2 of the first lens is concave. The object-side surface S3 of the second lens is convex, and the image-side surface S4 of the second lens is concave. The object-side surface S5 of the third lens is convex, and the image-side surface S6 of the third lens is concave. The object-side surface S7 of the fourth lens is convex, and the image-side surface S8 of the fourth lens is concave. The object-side surface S9 of the fifth lens is convex, and the image-side surface S10 of the fifth lens is convex. The object-side surface S11 of the sixth lens is concave, and the image-side surface S12 of the sixth lens is convex. The object-side surface S13 of the seventh lens is convex, and the image-side surface S14 of the seventh lens is concave. The object-side surface S15 of the eighth lens is concave, and the image-side surface S16 of the eighth lens is convex.

[0163] In Example 4, the effective focal length f1 of the first lens is 20.54 mm, the effective focal length f2 of the second lens is -2000.00 mm, the effective focal length f3 of the third lens is -38.43 mm, the effective focal length f4 of the fourth lens is -20.91 mm, the effective focal length f5 of the fifth lens is 7.86 mm, the effective focal length f6 of the sixth lens is -35.57 mm, the effective focal length f7 of the seventh lens is 17.00 mm, and the effective focal length f8 of the eighth lens is -11.45 mm.

[0164] Table 12 shows the basic structural parameters of the optical imaging module of Example 4, wherein the units of the curvature radius and thickness / distance are all millimeters.

[0165]

[0166] Table 12

[0167] Table 13 below lists the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 of the aspheric mirror surfaces S1-S16 in Example 4. The surface shape of each aspheric surface can be defined by formula (1) given in Example 1 above.

[0168] Face number A4 A6 A8 A10 A12 A14 A16 S1 -6.4264E-02 -1.7702E-02 -5.0363E-03 -1.0901E-03 -1.4956E-04 -4.3820E-05 7.7469E-06 S2 -5.5608E-02 -2.6499E-02 -4.0837E-03 -8.2199E-04 1.8474E-05 -4.5162E-05 3.8600E-05 S3 8.8956E-03 -2.3468E-02 7.6141E-03 4.4006E-04 -7.4991E-04 -1.3036E-05 -2.4974E-04 S4 -2.0821E-01 3.9934E-02 -5.0022E-03 9.0606E-03 -3.6672E-03 3.9027E-03 -1.0224E-03 S5 -5.7395E-01 8.1110E-02 -1.7635E-02 4.0833E-03 -2.5224E-03 1.9463E-03 -9.6684E-04 S6 -5.2148E-01 2.9638E-02 -2.8757E-03 -9.3797E-04 2.3037E-03 -7.4932E-05 6.8692E-05 S7 -2.9238E-01 -8.2300E-02 1.6953E-02 -1.3882E-03 3.1476E-03 -4.1140E-04 7.2642E-04 S8 -5.5263E-01 -1.2672E-02 1.1621E-02 -2.0831E-03 2.2630E-03 -2.3879E-03 1.2210E-03 S9 -4.6940E-01 8.8753E-03 -3.2596E-03 9.4076E-03 9.4485E-04 -4.2578E-03 -3.4793E-04 S10 -4.3084E-01 -5.3118E-02 8.7542E-03 2.7155E-04 5.2226E-03 1.8491E-03 7.8198E-04 S11 1.0514E+00 -5.8878E-02 5.2997E-02 -2.4736E-02 2.9451E-03 -3.2850E-03 8.1588E-04 S12 -1.4377E-01 1.2003E-01 -3.2559E-04 3.0725E-03 -2.9330E-03 -1.5042E-03 4.1535E-04 S13 -3.9187E+00 -1.1155E-01 1.3599E-02 5.0378E-02 7.5967E-03 -1.0712E-03 -1.7233E-03 S14 -2.0528E+00 -1.7531E-02 1.6693E-01 -3.6594E-02 4.5624E-03 -4.8382E-03 3.4106E-03 S15 1.8334E+00 1.7219E-01 -1.9519E-02 -1.3699E-02 6.4955E-02 -1.7018E-02 1.2251E-02 S16 2.5398E-01 -2.2196E-01 1.2641E-01 -6.9193E-02 4.0826E-02 -2.1547E-02 1.0141E-02 Face number A18 A20 A22 A24 A26 A28 A30 S1 -1.2951E-05 2.8437E-06 -8.1433E-06 2.7426E-06 5.5966E-06 -2.3648E-06 -6.8160E-08 S2 -2.4984E-05 2.2865E-05 -1.5905E-05 1.9719E-05 -5.8502E-06 7.3030E-06 -7.7367E-06 S3 -1.2433E-04 -7.6072E-05 -6.7339E-05 -3.8397E-05 -2.4472E-05 -9.0592E-06 5.3285E-07 S4 1.0331E-03 1.2885E-04 2.2903E-04 9.5464E-05 5.8523E-05 1.9979E-05 1.8124E-06 S5 2.5823E-04 -3.8145E-07 -3.4538E-05 1.6491E-05 -2.5072E-06 7.4075E-06 -2.0880E-06 S6 4.0687E-06 1.3430E-04 -6.9316E-05 4.0208E-05 -1.2930E-05 8.9500E-06 2.8446E-06 S7 -8.2837E-05 2.6255E-04 -1.3157E-05 3.8494E-05 6.0055E-06 1.6391E-06 4.9146E-06 S8 -8.0506E-04 2.7363E-04 -2.3340E-04 1.4130E-04 -2.6257E-05 2.1854E-07 -4.0888E-06 S9 -7.0157E-04 6.5158E-04 3.4218E-04 2.7523E-04 -6.3934E-05 -5.4585E-05 -8.5652E-06 S10 -1.4824E-04 -3.1327E-04 -2.8971E-04 -1.7050E-04 -8.6599E-05 -2.5113E-05 -2.1283E-06 S11 -3.9792E-04 1.7368E-04 -2.3288E-05 4.7685E-05 2.0821E-05 2.8498E-05 1.7749E-05 S12 -5.5955E-04 2.8597E-04 -1.5276E-04 1.0995E-04 -6.1008E-05 1.6045E-05 -2.0502E-05 S13 -2.1030E-03 -5.2504E-04 -2.2294E-04 1.9420E-04 2.8890E-05 4.9188E-05 -1.8310E-05 S14 -2.0433E-03 7.8440E-04 -2.1484E-04 8.8978E-06 2.4546E-05 2.0223E-05 3.0723E-05 S15 -8.7684E-03 -2.4176E-03 -5.1336E-03 -7.6074E-04 -1.5277E-03 2.1743E-04 -2.6482E-04 S16 -4.7602E-03 2.5409E-03 -1.2595E-03 2.1819E-04 3.3654E-04 -3.1381E-04 8.0411E-05

[0169] Table 13

[0170] Figure 16The astigmatism curve of the optical imaging module of Example 4 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 17 The distortion curve of the optical imaging module of the fourth embodiment is shown, which represents the distortion magnitude values ​​corresponding to different field angles.

[0171] according to Figure 16 and Figure 17 It can be seen that the optical imaging module provided in the fourth embodiment can achieve good imaging quality.

[0172] In summary, Examples 1 to 4 respectively satisfy the relationships shown in Table 14.

[0173] Conditional formula / Example 1-1 1-2 2-1 2-2 3-1 3-2 4-1 4-2 R1 / (D10s-d10s) 10.03 10.06 13.62 13.62 13.77 14.17 7.49 7.57 R2*d10m / (R3*D20s) 2.24 2.22 2.47 2.47 2.07 2.07 1.39 1.39 f1 / (CT1+L10) 10.99 10.99 10.58 10.58 16.53 16.53 7.06 7.06 R7*d3m / (R6*d3s) 2.60 2.60 2.60 2.60 2.58 2.58 2.15 2.15 D3s / R5 1.12 1.15 1.24 0.98 1.52 1.24 1.31 1.07 T34 / (T23+T45) 2.34 2.34 2.64 2.64 2.94 2.94 2.11 2.11 R8*N4 / (D4s-d4s) 6.46 4.20 4.42 10.09 5.54 9.51 4.06 8.11 f5 / d5s 1.31 1.34 1.40 1.39 1.27 1.27 0.91 0.96 R10 / (D5s-d5s) -4.84 -2.59 -3.11 -3.32 -2.44 -2.44 -7.04 -3.85 EP45 / T56 1.52 1.52 1.64 1.59 2.65 2.73 0.67 0.70 R12 / d6s / (R11 / D5m) 1.24 1.32 1.13 1.19 1.23 1.19 1.59 1.63 (CP6+CT6+T67) / CT7 3.17 1.48 3.29 1.47 2.62 1.82 3.59 2.02 R13 / (D6m-d6m) 2.02 1.16 2.74 1.36 2.35 2.38 1.82 1.89 L30 / CT8 3.53 3.53 4.06 4.22 3.42 3.39 2.95 2.95 R15 / (D30s-d30s) -2.29 -2.21 -1.78 -2.08 -2.83 -2.84 -1.27 -1.26 (D10s-d10s) / CT1 0.91 0.90 0.68 0.68 0.88 0.86 1.13 1.12 EP45 / d4s 0.08 0.08 0.09 0.09 0.09 0.09 0.07 0.08

[0174] Table 14

[0175] Table 15 shows the effective focal lengths of the lenses of the optical imaging modules of Examples 1 to 4.

[0176] Parameters / Example one two three Four f1(mm) 30.92 29.83 42.99 20.54 f2(mm) 14.58 14.70 16.10 -2000.00 f3(mm) -13.77 -13.69 -18.90 -38.43 f4(mm) -44.48 -40.15 -86.76 -20.91 f5(mm) 10.99 10.99 10.08 7.86 f6(mm) -227.51 1800.00 -1800.02 -35.57 f7(mm) 29.88 32.40 -1000.00 17.00 f8(mm) -10.54 -10.22 -13.35 -11.45

[0177] Table 15

[0178] The present application also provides an imaging device, wherein the electronic photosensitive element thereof may be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The imaging device may be a standalone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging module described above.

[0179] Obviously, the embodiments described above are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0180] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0181] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0182] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An optical imaging module, characterized in that: The lens comprises at least one lens barrel, eight lenses and at least one spacer element, wherein the eight lenses and the at least one spacer element are arranged in the at least one lens barrel. The eight lenses include, from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens; The at least one spacer element includes a fifth spacer element, the fifth spacer element being located between the fifth lens and the sixth lens and in contact with the image-side surface portion of the fifth lens; The air interval T23 between the second lens and the third lens on the optical axis, the air interval T34 between the third lens and the fourth lens on the optical axis, and the air interval T45 between the fourth lens and the fifth lens on the optical axis satisfy the following conditions: 2.11≤T34 / (T23+T45)≤2.94; The effective focal length f5 of the fifth lens and the inner diameter d5s of the object-side surface of the fifth spacer element satisfy the following ratio: 0.91≤f5 / d5s≤1.

40.

2. The optical imaging module according to claim 1, wherein: There are three lens barrels, which are the first lens barrel, the second lens barrel and the third lens barrel in order from the object side to the image side. The first lens is arranged in the first lens barrel, the second lens to the seventh lens are arranged in the second lens barrel, and the eighth lens is arranged in the third lens barrel.

3. The optical imaging module according to claim 2, wherein: The curvature radius R1 of the object-side surface of the first lens, the outer diameter D10s of the end surface of the first lens barrel closest to the object side, and the inner diameter d10s of the end surface of the first lens barrel closest to the object side satisfy the following relationship: 7.49≤R1 / (D10s-d10s)≤14.

17.

4. The optical imaging module according to claim 2, wherein: The curvature radius R2 of the image-side surface of the first lens, the curvature radius R3 of the object-side surface of the second lens, the inner diameter d10m of the end surface closest to the image side of the first lens barrel, and the outer diameter D20s of the end surface closest to the object side of the second lens barrel satisfy the following relationship: 1.39≤R2*d10m / (R3*D20s)≤2.

47.

5. The optical imaging module according to claim 2, wherein: The effective focal length f1 of the first lens, the center thickness CT1 of the first lens on the optical axis, and the maximum axial height L10 of the first lens barrel satisfy the following: 7.06≤f1 / (CT1+L10)≤16.

53.

6. The optical imaging module according to claim 1, wherein: The at least one spacer element further includes a third spacer element located between the third lens and the fourth lens and in contact with the image-side surface of the third lens. The inner diameter d3s of the object side surface of the third spacer element, the inner diameter d3m of the image side surface of the third spacer element, the curvature radius R6 of the image side surface of the third lens and the curvature radius R7 of the object side surface of the fourth lens satisfy: 2.15≤R7*d3m / (R6*d3s)≤2.

60.

7. The optical imaging module according to claim 1, wherein: The at least one spacer element further includes a third spacer element located between the third lens and the fourth lens and in contact with the image-side surface of the third lens. A curvature radius R5 of the object-side surface of the third lens and an outer diameter D3s of the object-side surface of the third spacer element satisfy the following: 0.98≤D3s / R5≤1.

52.

8. The optical imaging module according to claim 1, wherein: The at least one spacer element further includes a fourth spacer element located between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens. An outer diameter D4s of the object-side surface of the fourth spacer element, an inner diameter d4s of the object-side surface of the fourth spacer element, a curvature radius R8 of the image-side surface of the fourth lens, and a refractive index N4 of the fourth lens satisfy the following relationship: 4.06≤R8*N4 / (D4s-d4s)≤10.

09.

9. The optical imaging module according to claim 1, wherein: A curvature radius R10 of the image-side surface of the fifth lens, an outer diameter D5s of the object-side surface of the fifth spacer element, and an inner diameter d5s of the object-side surface of the fifth spacer element satisfy the following: -7.04≤R10 / (D5s-d5s)≤-2.

44.

10. The optical imaging module according to claim 1, wherein: The at least one spacer element further includes a fourth spacer element located between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens. An axial interval EP45 between the fourth spacer element and the fifth spacer element and an air interval T56 between the fifth lens and the sixth lens on the optical axis satisfy the following: 0.67≤EP45 / T56≤2.

73.

11. The optical imaging module according to claim 1, wherein: The at least one spacer element further includes a sixth spacer element located between the sixth lens and the seventh lens and in contact with the image-side surface of the sixth lens. The curvature radius R11 of the object side surface of the sixth lens, the curvature radius R12 of the image side surface of the sixth lens, the outer diameter D5m of the image side surface of the fifth spacer element and the inner diameter d6s of the object side surface of the sixth spacer element satisfy the following relationship: 1.13≤R12 / d6s / (R11 / D5m)≤1.

63.

12. The optical imaging module according to claim 1, wherein: The at least one spacer element further includes a sixth spacer element located between the sixth lens and the seventh lens and in contact with the image-side surface of the sixth lens. The maximum thickness CP6 of the sixth spacer element, the center thickness CT6 of the sixth lens on the optical axis, the air gap T67 between the sixth lens and the seventh lens on the optical axis, and the center thickness CT7 of the seventh lens on the optical axis satisfy the following: 1.47≤(CP6+CT6+T67) / CT7≤3.

59.

13. The optical imaging module according to claim 1, wherein: The at least one spacer element further includes a sixth spacer element located between the sixth lens and the seventh lens and in contact with the image-side surface of the sixth lens. A curvature radius R13 of the object side surface of the seventh lens, an outer diameter D6m of the image side surface of the sixth spacer element, and an inner diameter d6m of the image side surface of the sixth spacer element satisfy the following relationship: 1.16≤R13 / (D6m-d6m)≤2.

74.

14. The optical imaging module according to claim 2, wherein: The maximum axial height L30 of the third lens barrel and the center thickness CT8 of the eighth lens on the optical axis satisfy the following: 2.95≤L30 / CT8≤4.

22.

15. The optical imaging module according to claim 2, wherein: The curvature radius R15 of the object-side surface of the eighth lens, the outer diameter D30s of the end surface of the second lens barrel closest to the object side, and the inner diameter d30s of the end surface of the second lens barrel closest to the object side satisfy: -2.84≤R15 / (D30s-d30s)≤-1.

26.

16. The optical imaging module according to any one of claims 1 to 15, characterized in that: The first lens has positive optical power, the third lens has negative optical power, the fourth lens has negative optical power, the fifth lens has positive optical power, and the eighth lens has negative optical power.

17. The optical imaging module according to any one of claims 1 to 15, characterized in that: The object side surface of the first lens is convex, and the image side surface is concave; The object side surface of the second lens is convex; The object side surface of the third lens is convex, and the image side surface is concave; The object-side surface of the fourth lens is convex, and the image-side surface is concave; The object-side surface of the fifth lens is convex, and the image-side surface is convex; The object-side surface of the sixth lens is concave, and the image-side surface is convex; The object-side surface of the seventh lens is convex, and the image-side surface is concave; The object-side surface of the eighth lens is concave.

Images