Optical imaging lens

Abstract

The utility model provides an optical imaging lens. The optical imaging lens comprises a lens barrel, a lens group and a plurality of spacing elements, wherein the lens group and the spacing elements are arranged in the lens barrel; the lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens; the plurality of spacing elements comprise a first spacing element, a second spacing element, a third spacing element, a fifth spacing element, a sixth spacing element and a seventh spacing element; semi-FOV is greater than or equal to 78 degrees and less than or equal to 84 degrees; 2.1 lt; dT11 / DT81lt, and DT11 / DT81lt; 3.75%, 3.75%; 0.50 < = (d0s-d0m) / (DT11-DT82) lt; and 1.3. According to the utility model, the problem that the optical imaging lens in the prior art satisfies a large field angle, so that the aperture of the lens is increased and the assembly stability is influenced 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 lens. Background Art

[0002] As the demands for optical imaging lenses installed in devices such as smartphones, drones, and security cameras continue to increase, optical imaging lenses with a wide field of view are becoming increasingly popular due to their ability to capture a wider range of scenes. However, to accommodate this wide field of view, current optical imaging lenses typically require a larger lens diameter. This increase in lens diameter increases the overall size and weight of the optical imaging lens, and also results in steeper light rays at the edge of the lens, affecting the lens's assembly stability.

[0003] That is to say, the optical imaging lens in the prior art has the problem that in order to meet the wide field angle, the lens aperture increases, thereby affecting the assembly stability. Utility Model Content

[0004] The main purpose of the utility model is to provide an optical imaging lens to solve the problem in the prior art that a large field of view causes an increase in lens aperture, thereby affecting assembly stability.

[0005] To achieve the above object, according to one aspect of the present utility model, an optical imaging lens is provided, which includes a lens barrel and a lens group and a plurality of spacer elements disposed in the lens barrel. The lens barrel has an object-side end face, an image-side end face, an outer ring face and an inner ring face, and at least a part of the inner ring face is stepped; the lens group sequentially includes 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, and there is an air gap between two adjacent lenses from the first lens to the eighth lens; the plurality of spacer elements include a first spacer element located between the first lens and the second lens and partially contacting the image-side surface of the first lens, a second spacer element located between the second lens and the third lens and partially contacting the image-side surface of the second lens, a third spacer element located between the third lens and the fourth lens and partially contacting the image-side surface of the third lens, a fifth spacer element located between the fifth lens and the sixth lens and partially contacting the image-side surface of the fifth lens, a sixth spacer element located between the sixth lens and the seventh lens and partially contacting the image-side surface of the sixth lens, and a seventh spacer element located between the seventh lens and the eighth lens and partially contacting the image-side surface of the seventh lens; the maximum semi-field angle Semi-Fov of the optical imaging lens satisfies: 78° ≤ Semi-FOV ≤ 84°; the effective diameter DT11 of the light-transmitting portion of the object-side surface of the first lens and the effective diameter DT81 of the light-transmitting portion of the object-side surface of the eighth lens satisfy: 2.1 < DT11 / DT81 < 3.75; the inner diameter d0s of the object-side surface of the lens barrel, the inner diameter d0m of the image-side surface of the lens barrel, the effective diameter DT11 of the light-transmitting portion of the object-side surface of the first lens and the effective diameter DT82 of the light-transmitting portion of the image-side surface of the eighth lens satisfy: -0.50 ≤ (d0s - d0m) / (DT11 - DT82) < 1.3.

[0006] According to another aspect of the present utility model, an optical imaging lens is further provided, which includes a lens barrel and a lens group and multiple spacer elements disposed in the lens barrel. The lens barrel has an object-side end face, an image-side end face, an outer ring face and an inner ring face, and at least part of the inner ring face is stepped; the lens group sequentially includes, 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, and there is an air gap between two adjacent lenses among the first lens to the eighth lens; the multiple spacer elements include a first spacer element located between the first lens and the second lens and partially contacting the image-side face of the first lens, a second spacer element located between the second lens and the third lens and partially contacting the image-side face of the second lens, a third spacer element located between the third lens and the fourth lens and partially contacting the image-side face of the third lens, a fifth spacer element located between the fifth lens and the sixth lens and partially contacting the image-side face of the fifth lens, a sixth spacer element located between the sixth lens and the seventh lens and partially contacting the image-side face of the sixth lens, and a seventh spacer element located between the seventh lens and the eighth lens and partially contacting the image-side face of the seventh lens; the maximum semi-field angle Semi-Fov of the optical imaging lens satisfies: 78° ≤ Semi-FOV ≤ 84°; the effective diameter DT11 of the light-transmitting portion of the object-side face of the first lens and the effective diameter DT81 of the light-transmitting portion of the object-side face of the eighth lens satisfy: 2.1 < DT11 / DT81 < 3.75; the inner diameter d1s of the object-side face of the first spacer element, the inner diameter d7m of the image-side face of the seventh spacer element, the outer diameter D0s of the object-side face of the lens barrel and the outer diameter D0m of the image-side face of the lens barrel satisfy: 4.2 < (D0s / d1s) + (D0m / d7m) < 10.

[0007] Further, when -0.6 < (d0s - d0m) / (DT11 - DT82) < 0 is satisfied, both the object-side face and the image-side face of the non-light-transmitting portion of the eighth lens have a wavy structure.

[0008] Further, when -0.6 < (d0s - d0m) / (DT11 - DT82) < 0 is satisfied, at least one of the object-side face and the image-side face of the non-light-transmitting portion of the seventh lens has a wavy structure, and the object-side face and the image-side face of the non-light-transmitting portion of the sixth lens are selectively provided with a wavy structure.

[0009] Further, the ratio of the projected area of the wavy structure on the surface of the non-light-transmitting portion where it is located to the surface area of the non-light-transmitting portion where it is located is greater than or equal to 50% and less than or equal to 100%.

[0010] Further, the inner diameter d1s of the object-side face of the first spacer element, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy: -2.9 < (f1 + f2) / d1s < -2.

[0011] Furthermore, the inner diameter d2s of the object side surface of the second spacer element, the inner diameter d2m of the image side surface of the second spacer element, the curvature radius R4 of the image side surface of the second lens and the curvature radius R5 of the object side surface of the third lens satisfy the following relationship: 1 <d2s / R4-d2m / R5<1.5。

[0012] Furthermore, the outer diameter D1s of the object side surface of the first spacer element, the outer diameter D2s of the object side surface of the second spacer element, the effective diameter DT12 of the light-transmitting portion of the image side surface of the first lens, and the effective diameter DT22 of the light-transmitting portion of the image side surface of the second lens satisfy the following relationship: 3.2 <D1s / DT12+D2s / DT22<6.8。

[0013] Furthermore, among the plurality of spacer elements, the inner diameter d3s of the object-side surface of the third spacer element is the smallest.

[0014] Furthermore, the effective diameter DT11 of the light-transmitting portion on the object side of the first lens, the effective diameter DT82 of the light-transmitting portion on the image side of the eighth lens, and the inner diameter d3s of the object side of the third spacer element satisfy the following relationship: 1.6 <DT11 / d3s-DT82 / d3s<3.9。

[0015] Furthermore, the inner diameter d1s of the object side surface of the first spacer element, the inner diameter d3s of the object side surface of the third spacer element, the effective focal length f1 of the first lens and the effective focal length f3 of the third lens satisfy: -0.3<(d1s-d3s) / (f1-f3)<-0.1.

[0016] Furthermore, the inner diameter d3m of the image side surface of the third spacer element, the outer diameter D3m of the image side surface of the third spacer element, and the effective diameter DT41 of the light transmitting portion of the object side surface of the fourth lens satisfy: 0.75<(D3m-d3m) / DT41<3.7.

[0017] Furthermore, the multiple spacer elements also include a fourth spacer element that is selectively arranged between the fourth lens and the fifth lens and contacts the image side portion of the fourth lens. When the fourth spacer element is not arranged between the fourth lens and the fifth lens, the non-light-transmitting portion of the fourth lens abuts against the non-light-transmitting portion of the fifth lens.

[0018] Furthermore, when a fourth spacer is provided between the fourth lens and the fifth lens, an inner diameter d3s of the object-side surface of the third spacer and an inner diameter d4s of the object-side surface of the fourth spacer satisfy the relationship: 1.10≤d4s / d3s<1.45.

[0019] Further, the inner diameters of the fifth spacer element, the sixth spacer element, and the seventh spacer element gradually increase, and the following relationship is satisfied among the inner diameter d5s of the object side surface of the fifth spacer element, the inner diameter d6s of the object side surface of the sixth spacer element, and the inner diameter d7s of the object side surface of the seventh spacer element: 0.3 < (d7s - d6s) / (d6s - d5s) < 2.6.

[0020] Further, the following relationship is satisfied among the inner diameter d1s of the object side surface of the first spacer element, the inner diameter d7m of the image side surface of the seventh spacer element, the outer diameter D0s of the object side surface of the lens barrel, and the outer diameter D0m of the image side surface of the lens barrel: 4.2 < (D0s / d1s) + (D / s / d7m) < 10.

[0021] Applying the technical solution of the present utility model, the optical imaging lens of the present application consists of a lens barrel and eight lenses and multiple spacer elements arranged in the lens barrel. By reasonably arranging the positions of the eight lenses and multiple spacer elements and setting the optical imaging lens to satisfy the condition of 78° ≤ Semi-FOV ≤ 84° and 2.1 < DT11 / DT81 < 3.75, it can meet the ultra-wide angle. However, in this case, the effective diameter of the first lens is more than twice that of the eighth lens, resulting in an overly large size of the first lens. An overly large size of the first lens is likely to cause a problem of steep refraction of marginal rays, affecting the bearing stability of the first lens. The present application reasonably restricts the relationship between the difference in the inner diameters of the object side surface and the image side surface of the lens barrel and the difference in the effective diameters of the first lens and the eighth lens by restricting that -0.50 ≤ (d0s - d0m) / (DT11 - DT82) < 1.3, enabling the sizes of the first lens, the eighth lens, and the inner diameter of the lens barrel to cooperate with each other. This is conducive to controlling the ratio of the aperture of the lens to the inner diameter of the lens barrel, avoiding the situation of overly large lens sizes brought about by meeting a large field angle, and at the same time, restricting the inner diameter of the lens barrel within a reasonable range to ensure a relatively small overall size of the optical imaging lens. Controlling the size of the lens is conducive to avoiding the problem of steep refraction of marginal rays, ensuring the smoothness of the refraction of marginal rays, thereby enhancing the assembly stability of the lens in the lens barrel, ensuring that the lens can be stably supported, and further ensuring the assembly sensitivity of the optical imaging lens and enhancing the assembly stability of the optical imaging lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0023] Figure 1 A dimension marking diagram of the optical imaging lens showing an optional embodiment of the present utility model is shown;

[0024] Figure 2A partial enlarged view of the wave structure on the lens of the optical imaging lens of the present invention is shown;

[0025] Figure 3 FIG2 shows a schematic structural diagram of an optical imaging lens in a first state according to a first embodiment of the present invention;

[0026] Figure 4 FIG2 shows a schematic structural diagram of an optical imaging lens in a second state according to a first embodiment of the present invention;

[0027] Figure 5 FIG2 shows a schematic structural diagram of the optical imaging lens in the third state according to the first embodiment of the present utility model;

[0028] Figures 6 to 8 axial chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging lens according to the first embodiment of the present invention are respectively shown;

[0029] Figure 9 A schematic structural diagram of an optical imaging lens in a first state according to a second embodiment of the present utility model is shown;

[0030] Figure 10 A schematic structural diagram of the optical imaging lens in the second state according to the second embodiment of the present utility model is shown;

[0031] Figure 11 A schematic structural diagram of the optical imaging lens in the third state according to the second embodiment of the present utility model is shown;

[0032] Figures 12 to 14 axial chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging lens of Example 2 of the present utility model are respectively shown;

[0033] Figure 15 FIG2 shows a schematic structural diagram of an optical imaging lens in a first state according to a third embodiment of the present invention;

[0034] Figure 16 FIG2 shows a schematic structural diagram of an optical imaging lens in a second state according to a third embodiment of the present invention;

[0035] Figure 17 FIG2 shows a schematic structural diagram of an optical imaging lens in a third state according to a third embodiment of the present invention;

[0036] Figures 18 to 20 The figure shows the axial chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging lens of the third embodiment of the present invention;

[0037] Figure 21The MTF defocus curve diagram is shown when the optical imaging lens of an optional embodiment of the present utility model satisfies 78° ≤ Semi-FOV ≤ 84°, 2.1 < DT11 / DT81 < 3.75, and (d0s - d0m) / (DT11 - DT82) = 0.68;

[0038] Figure 22 The MTF defocus curve diagram is shown when the optical imaging lens of an optional embodiment of the present utility model satisfies 8° ≤ Semi-FOV ≤ 84°, 2.1 < DT11 / DT81 < 3.75, and (d0s - d0m) / (DT11 - DT82) = -1.21;

[0039] Figure 23 The MTF defocus curve diagram is shown when the optical imaging lens of an optional embodiment of the present utility model satisfies 8° ≤ Semi-FOV ≤ 84°, 2.1 < DT11 / DT81 < 3.75, and (d0s - d0m) / (DT11 - DT82) = 1.77.

[0040] Among them, the above-mentioned drawings include the following reference numerals:

[0041] P0, 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, 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; P1, first spacer element; P2, second spacer element; P3, third spacer element; P4, fourth spacer element; P5, fifth spacer element; P6, sixth spacer element; P7, seventh spacer element; P7b, seventh auxiliary spacer element; 10, wave structure. Detailed implementation manners

[0042] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The present utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0043] It should be pointed out that unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] In this article, the paraxial area refers to the area near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial area; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial area. The judgment of the surface 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. For 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; for 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. The left side is the object side, and the right side is the image side.

[0048] In order to solve the problem in the prior art that a large field of view angle causes an increase in lens aperture, thereby affecting assembly stability, the present utility model provides an optical imaging lens.

[0049] like Figures 1 to 23As shown, in an optional embodiment of the present application, the optical imaging lens includes a lens barrel and a lens group and a plurality of spacer elements disposed in the lens barrel. The lens barrel has an object-side end face, an image-side end face, an outer ring face, and an inner ring face, and at least a part of the inner ring face is stepped; the lens group sequentially includes, 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, and there is an air gap between two adjacent lenses among the first lens to the eighth lens; the plurality of spacer elements include a first spacer element located between the first lens and the second lens and partially contacting the image-side surface of the first lens, a second spacer element located between the second lens and the third lens and partially contacting the image-side surface of the second lens, a third spacer element located between the third lens and the fourth lens and partially contacting the image-side surface of the third lens, a fifth spacer element located between the fifth lens and the sixth lens and partially contacting the image-side surface of the fifth lens, a sixth spacer element located between the sixth lens and the seventh lens and partially contacting the image-side surface of the sixth lens, and a seventh spacer element located between the seventh lens and the eighth lens and partially contacting the image-side surface of the seventh lens; the maximum semi-field angle Semi-Fov of the optical imaging lens satisfies: 78° ≤ Semi-FOV ≤ 84°; the effective diameter DT11 of the light-transmitting portion of the object-side surface of the first lens and the effective diameter DT81 of the light-transmitting portion of the object-side surface of the eighth lens satisfy: 2.1 < DT11 / DT81 < 3.75; the inner diameter d0s of the object-side surface of the lens barrel, the inner diameter d0m of the image-side surface of the lens barrel, the effective diameter DT11 of the light-transmitting portion of the object-side surface of the first lens, and the effective diameter DT82 of the light-transmitting portion of the image-side surface of the eighth lens satisfy: -0.50 ≤ (d0s - d0m) / (DT11 - DT82) < 1.3.

[0050] The optical imaging lens of the present application consists of a lens barrel and eight lenses and multiple spacer elements disposed in the lens barrel. By reasonably arranging the positions of the eight lenses and multiple spacer elements and setting the optical imaging lens to satisfy 78° ≤ Semi-FOV ≤ 84° and 2.1 < DT11 / DT81 < 3.75, it can meet the ultra-wide angle. However, in this case, the effective diameter of the first lens is more than twice the effective diameter of the eighth lens, making the size of the first lens too large. The overly large size of the first lens easily causes the problem of steep refraction of marginal rays, affecting the bearing stability of the first lens. The present application restricts -0.50 ≤ (d0s - d0m) / (DT11 - DT82) < 1.3, reasonably restricting the relationship between the difference in the inner diameters of the object side and the image side of the lens barrel and the difference in the effective diameters of the first lens and the eighth lens, enabling the sizes of the first lens, the eighth lens, and the inner diameter of the lens barrel to cooperate with each other, facilitating the control of the ratio of the lens aperture to the inner diameter of the lens barrel, avoiding the situation of overly large lens sizes brought about by meeting the large field angle, and at the same time restricting the inner diameter of the lens barrel within a reasonable range, ensuring that the overall size of the optical imaging lens is small. Controlling the size of the lens helps avoid the problem of steep refraction of marginal rays, helps ensure the smoothness of marginal ray refraction, thereby improving the assembly stability of the lens in the lens barrel, ensuring that the lens can be stably supported, and further ensuring the assembly sensitivity of the optical imaging lens and improving the assembly stability of the optical imaging lens.

[0051] In addition, on the premise that the optical imaging lens satisfies 78° ≤ Semi-FOV ≤ 84° and 2.1 < DT11 / DT81 < 3.75, referring to Table 1 below and Figures 21 to 23 as shown Figure 21 shows the MTF defocus curve graph when the optical imaging lens satisfies (d0s - d0m) / (DT11 - DT82) = 0.68, Figure 22 shows the MTF defocus curve graph when the optical imaging lens satisfies (d0s - d0m) / (DT11 - DT82) = -1.21, Figure 23 shows the MTF defocus curve graph when the optical imaging lens satisfies (d0s - d0m) / (DT11 - DT82) = 1.77. From Table 1, Figure 21 , Figure 22 and Figure 23As shown in the figure, when (d0s-d0m) / (DT11-DT82)=-1.21, the MTF through-focus curve performs poorly. At this time, d0m is too large, resulting in a decrease in the support stability of the lens and an increase in the dispersion of the external field of view. When (d0s-d0m) / (DT11-DT82)=1.77, the MTF through-focus curve performs poorly. At this time, d0m is too small, resulting in a steeper refraction of light in the external field of view, resulting in a decrease in the external field of view peak. When (d0s-d0m) / (DT11-DT82)=0.68, the MTF through-focus curve performs well, and the design of each parameter is more reasonable. It can be seen that when (d0s-d0m) / (DT11-DT82) is in the range of -0.50 to 1.3, the MTF defocus curve of the optical imaging lens performs best. Therefore, the present application, by constraining -0.50≤(d0s-d0m) / (DT11-DT82)<1.3, is conducive to controlling the ratio of the lens aperture to the inner diameter of the lens barrel, which can avoid the situation where the lens size is too large to meet the large field of view angle. At the same time, it can constrain the inner diameter of the lens barrel within a reasonable range to ensure that the overall size of the optical imaging lens is small. Controlling the size of the lens is conducive to avoiding the problem of steep refraction of edge light and ensuring the smoothness of the refraction of edge light, thereby improving the assembly stability of the lens in the lens barrel, ensuring that the lens can be stably supported, and then ensuring the assembly sensitivity of the optical imaging lens, improving the assembly stability of the optical imaging lens, and at the same time improving the performance of the MTF defocus curve, which is conducive to improving imaging quality.

[0052] Example 1 Example 2 Example 3 (d0s-d0m) / (DT11-DT82) 0.68 -1.21 1.77 performance See Figure 21 See Figure 22 See Figure 23

[0053] Table 1

[0054] It should be noted that each of the first through eighth lenses comprises a light-transmitting portion and a non-light-transmitting portion, the non-light-transmitting portion being located outside and extending along the circumference of the light-transmitting portion, and the two portions being connected. The light-transmitting portion allows imaging light to pass through, while the non-light-transmitting portion is not used for imaging light to pass through and is used for abutment with adjacent lenses, spacers, or the lens barrel.

[0055] like Figure 2As shown, when -0.6<(d0s-d0m) / (DT11-DT82)<0 is satisfied, the object side surface and the image side surface of the non-light-transmitting portion of the eighth lens both have a wavy structure 10. The wavy structure 10 refers to a continuous, regular or irregular undulating structure formed on the non-light-transmitting portions of the object side surface and the image side surface of the eighth lens. When the tail of the lens barrel is higher and the non-light-transmitting portion of the eighth lens is longer, the wavy structure 10 is provided to introduce tiny light scattering, so that when the light passes through the wavy structure 10, part of the light is scattered, thereby reducing the sharpness of the image and increasing the softness and layering of the image. In addition, the provision of the wavy structure 10 can also suppress stray light, reduce the interference of stray light by changing the propagation direction of the light or absorbing part of the light, thereby improving the imaging quality.

[0056] In this embodiment, when -0.6<(d0s-d0m) / (DT11-DT82)<0 is satisfied, and both the object side surface and the image side surface of the non-light-transmitting portion of the eighth lens have a wavy structure 10, at least one of the object side surface and the image side surface of the non-light-transmitting portion of the seventh lens has a wavy structure 10, and the object side surface and the image side surface of the non-light-transmitting portion of the sixth lens are selectively provided with a wavy structure 10. In other words, both the object side surface and the image side surface of the non-light-transmitting portion of the sixth lens can be provided with a wavy structure 10, or one of the object side surface and the image side surface of the non-light-transmitting portion of the sixth lens can be provided with a wavy structure 10, or neither the object side surface nor the image side surface of the non-light-transmitting portion of the sixth lens is provided with a wavy structure 10. The specific number and setting position of the wavy structure 10 can be set according to actual needs. By adding the wavy structure 10, the complexity of the lens surface and the contact area with the lens barrel can be increased, thereby improving the assembly stability of the lens in the lens barrel.

[0057] In this embodiment, the ratio of the projected area of ​​the wave structure 10 on the surface of the non-light-transmitting portion in which it is located to the surface area of ​​the non-light-transmitting portion in which it is located is greater than or equal to 50% and less than or equal to 100%. In other words, the area of ​​the wave structure 10 accounts for at least half of the area of ​​the object-side or image-side surface of the non-light-transmitting portion in which it is located. By restricting the ratio of the projected area of ​​the wave structure 10 to the surface area of ​​the non-light-transmitting portion, it helps to increase the area of ​​the wave structure 10 and thus increase the heat dissipation area of ​​the lens surface. The wave structure 10 can increase air flow or radiant heat dissipation, thereby reducing the temperature of the lens and ensuring the thermal stability of the optical imaging lens.

[0058] In this embodiment, the inner diameter d1s of the object side surface of the first spacer element, the effective focal length f1 of the first lens, and the effective focal length f2 of the second lens satisfy: -2.9 < (f1 + f2) / d1s < -2. By precisely controlling the relationship between the inner diameter of the first spacer element and the effective focal lengths of the first lens and the second lens, the optical path can be optimized to ensure that light can maintain an appropriate path and distribution when passing through the first lens and the second lens. At the same time, it is beneficial to reduce unnecessary reflections, scattering, and aberrations, thereby improving the imaging quality.

[0059] In this embodiment, the inner diameter d2s of the object side surface of the second spacer element, the inner diameter d2m of the image side surface of the second spacer element, the radius of curvature R4 of the image side surface of the second lens, and the radius of curvature R5 of the object side surface of the third lens satisfy: 1 < d2s / R4 - d2m / R5 < 1.5. By controlling the relationship between the inner diameter of the second spacer element and the radii of curvature of the adjacent lenses, it is beneficial to optimize the optical path to ensure that light can maintain an appropriate path and distribution when passing through the two lenses and the spacer element, and it can also reduce the deflection, scattering, and aberrations of light, thereby improving the imaging quality.

[0060] In this embodiment, the outer diameter D1s of the object side surface of the first spacer element, the outer diameter D2s of the object side surface of the second spacer element, the effective diameter DT12 of the light-transmitting portion of the image side surface of the first lens, and the effective diameter DT22 of the light-transmitting portion of the image side surface of the second lens satisfy: 3.2 < D1s / DT12 + D2s / DT22 < 6.8. By reasonably planning the outer diameters of the spacer elements, it is beneficial to achieve a more compact optical system. A smaller outer diameter of the spacer element can reduce the overall volume and weight of the entire optical imaging lens.

[0061] In this embodiment, among the multiple spacer elements, the inner diameter d3s of the object side surface of the third spacer element is the smallest. Light converges at the third spacer element. By setting a smaller inner diameter of the object side of the third spacer element, the propagation path of light at the third spacer element can be restricted, which helps to reduce unnecessary reflections, scattering, or stray light, is beneficial to maintaining the purity and directivity of light transmission, and improves the imaging quality.

[0062] In this embodiment, the effective diameter DT11 of the light-transmitting portion of the object side surface of the first lens, the effective diameter DT82 of the light-transmitting portion of the image side surface of the eighth lens, and the inner diameter d3s of the object side surface of the third spacer element satisfy: 1.6 < DT11 / d3s - DT82 / d3s < 3.9. By controlling the relationship between the effective diameter of the light-transmitting portion of the lens and the inner diameter of the spacer element, the aberration can be effectively corrected, and the clarity and resolution of the imaging can be improved.

[0063] In this embodiment, the inner diameter d1s of the object-side surface of the first spacer, the inner diameter d3s of the object-side surface of the third spacer, the effective focal length f1 of the first lens, and the effective focal length f3 of the third lens satisfy the following relationship: -0.3 < (d1s - d3s) / (f1 - f3) < -0.1. Controlling the relationship between the inner diameter of the spacer and the effective focal length of the lens facilitates optical path optimization, ensuring that light maintains an appropriate path and distribution as it passes through the lens and spacer, and reducing light deflection, scattering, and unwanted reflections, thereby improving imaging quality.

[0064] In this embodiment, the inner diameter d3m of the image-side surface of the third spacer, the outer diameter D3m of the image-side surface of the third spacer, and the effective diameter DT41 of the light-transmitting portion of the object-side surface of the fourth lens satisfy the following relationship: 0.75 < (D3m - d3m) / DT41 < 3.7. By controlling the ratio of the wall thickness of the third spacer to the effective diameter of the light-transmitting portion of the adjacent lens, a compact design of the optical imaging lens can be achieved while maintaining optical performance. A thinner third spacer helps reduce the volume and weight of the entire optical imaging lens.

[0065] In this embodiment, the plurality of spacer elements further include a fourth spacer element selectively disposed between the fourth lens and the fifth lens and contacting the image-side surface of the fourth lens. That is, the fourth spacer element may or may not be disposed between the fourth lens and the fifth lens. When the fourth spacer element is not disposed between the fourth lens and the fifth lens, the non-light-transmitting portion of the fourth lens abuts against the non-light-transmitting portion of the fifth lens. When the non-light-transmitting portions of the fourth lens and the fifth lens directly abut against each other, the relative position of the fourth lens and the fifth lens can be better fixed, thereby reducing lens position shifts caused by vibration or impact, and improving the assembly stability and reliability of the optical imaging lens.

[0066] In this embodiment, when a fourth spacer element is disposed between the fourth and fifth lenses, the inner diameter d3s of the object-side surface of the third spacer element and the inner diameter d4s of the object-side surface of the fourth spacer element satisfy the following relationship: 1.10 ≤ d4s / d3s < 1.45. By controlling the size ratio of the spacer element, the overall stability of the optical imaging lens can be enhanced. The spacer element serves as a supporting structure between adjacent lenses, and its dimensional stability directly affects the relative position stability of the lenses. Therefore, by properly controlling the size of the spacer element, lens position shifts caused by vibration or impact can be reduced, thereby improving imaging clarity and stability.

[0067] In this embodiment, the inner diameters of the fifth, sixth, and seventh spacers gradually increase from the fifth to the seventh spacers, and the inner diameter d5s of the object-side surface of the fifth spacer, the inner diameter d6s of the object-side surface of the sixth spacer, and the inner diameter d7s of the object-side surface of the seventh spacer satisfy the following relationship: 0.3 < (d7s - d6s) / (d6s - d5s) < 2.6. By gradually increasing the inner diameters of the fifth, sixth, and seventh spacers in a stepped manner, the stability of the optical imaging lens is enhanced. Spacers serve as supporting and abutting components between adjacent lenses, and their stability and reliability significantly impact the performance of the entire optical system. Therefore, by controlling the growth trend of the inner diameters of the multiple spacers, the relative positions of the multiple spacers can be ensured to be relatively stable, reducing the risk of lens position shifting due to vibration or impact.

[0068] In this embodiment, the inner diameter d1s of the object-side surface of the first spacer, the inner diameter d7m of the image-side surface of the seventh spacer, the outer diameter D0s of the object-side surface of the lens barrel, and the outer diameter D0m of the image-side surface of the lens barrel satisfy the following relationship: 4.2 < (D0s / d1s) + (D0m / d7m) < 10. Planning the proportional relationship between the outer diameter of the lens barrel and the inner diameter of the spacer helps optimize the fit between the lens barrel and the spacer, ensuring a tight and stable connection between the lens barrel and the spacer, thereby maintaining the overall structural stability of the optical imaging lens and ensuring assembly stability.

[0069] In this embodiment, the first lens has negative optical power, the second lens has negative optical power, the third lens has positive optical power, the fifth lens has positive optical power, the sixth lens has negative optical power, and the seventh lens has positive optical power. By rationally planning the optical power of each lens, it is helpful to plan the light transmission path, ensuring smooth and stable light transmission and imaging stability.

[0070] In addition, in another optional embodiment of the present application, the optical imaging lens includes a lens barrel, a lens group, and a plurality of spacer elements disposed in the lens barrel. The lens barrel has an object-side end face, an image-side end face, an outer ring face, and an inner ring face, and at least a part of the inner ring face is stepped; the lens group sequentially includes, 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, and there is an air gap between two adjacent lenses among the first lens to the eighth lens; the plurality of spacer elements include a first spacer element located between the first lens and the second lens and partially contacting the image-side face of the first lens, a second spacer element located between the second lens and the third lens and partially contacting the image-side face of the second lens, a third spacer element located between the third lens and the fourth lens and partially contacting the image-side face of the third lens, a fifth spacer element located between the fifth lens and the sixth lens and partially contacting the image-side face of the fifth lens, a sixth spacer element located between the sixth lens and the seventh lens and partially contacting the image-side face of the sixth lens, and a seventh spacer element located between the seventh lens and the eighth lens and partially contacting the image-side face of the seventh lens; the maximum semi-field angle Semi-Fov of the optical imaging lens satisfies: 78° ≤ Semi-FOV ≤ 84°; the effective diameter DT11 of the light-transmitting portion of the object-side face of the first lens and the effective diameter DT81 of the light-transmitting portion of the object-side face of the eighth lens satisfy: 2.1 < DT11 / DT81 < 3.75; the inner diameter d1s of the object-side face of the first spacer element, the inner diameter d7m of the image-side face of the seventh spacer element, the outer diameter D0s of the object-side face of the lens barrel, and the outer diameter D0m of the image-side face of the lens barrel satisfy: 4.2 < (D0s / d1s) + (D0m / d7m) < 10.

[0071] The optical imaging lens of the present application is composed of a lens barrel, eight lenses, and a plurality of spacer elements disposed in the lens barrel. By reasonably arranging the positions of the eight lenses and the plurality of spacer elements and setting the optical imaging lens to satisfy 78° ≤ Semi-FOV ≤ 84° and 2.1 < DT11 / DT81 < 3.75, it can meet the ultra-wide angle. However, in this case, there is a situation where the size of the lens or the spacer element is too large, which is likely to affect the bearing stability. By restricting 4.2 < (D0s / d1s) + (D0m / d7m) < 10 and planning the proportional relationship between the outer diameter of the lens barrel and the inner diameter of the spacer element, it helps to optimize the cooperation between the lens barrel and the spacer element, ensure the rationality and matching degree of the sizes of the lens barrel and the spacer element, and ensure that the lens barrel and the spacer element can be tightly and stably connected together, thereby maintaining the overall structural stability of the optical imaging lens and ensuring the assembly stability.

[0072] Of course, other parametric forms in the above embodiments may also be included in this embodiment, which will not be elaborated here one by one.

[0073] Optionally, the optical imaging lens may further include a protective glass for protecting the photosensitive element located on the imaging surface.

[0074] The optical imaging lens in this application may utilize multiple lenses, such as the eight lenses described above. In this application, at least one of the lens surfaces is an aspheric surface. Aspheric lenses are characterized by a continuously varying curvature from the center to the periphery. Unlike spherical lenses, which have a constant curvature from the center to the periphery, aspheric lenses have a better curvature radius characteristic, with the advantages of improving distortion and astigmatism. The use of aspheric lenses can minimize aberrations that occur during imaging, thereby improving image quality.

[0075] However, those skilled in the art will appreciate that the number of lenses comprising the optical imaging lens can be varied to achieve the various results and advantages described herein without departing from the claimed technical solutions. For example, while eight lenses are described in the embodiments, the optical imaging lens is not limited to eight lenses. If desired, the optical imaging lens may include other numbers of lenses.

[0076] Figure 1 Schematic diagram of the structure of an optical imaging lens of the present application is shown. Figure 1 Parameters such as d1s, D1s, d2s, d2m, D2s, d3s, d3m, D3m, d4s, d5s, d6s, d7s, d7m, D0s, D0m, d0s, and d0m are labeled to provide a clear and intuitive understanding of their meaning. To facilitate the description of the optical imaging lens and specific lens surface shapes, these parameters will not be reflected in the drawings when describing specific embodiments.

[0077] The following further describes examples of specific surface shapes and parameters of the optical imaging lens applicable to the above-mentioned embodiments with reference to the accompanying drawings.

[0078] It should be noted that in the following embodiments, there are first, second, and third states. While the optical imaging lenses in the first, second, and third states of the same embodiment have the same parameters such as the radius of curvature, center thickness, and spacing between lenses, as well as the higher-order coefficients, for the first through eighth lenses, in the first, second, and third states, the lens barrel, the thickness, inner diameter, and outer diameter of the first through seventh spacers, as well as the shapes of some lenses, differ. In other words, the primary imaging structures remain the same, while the auxiliary imaging structures differ.

[0079] It should be noted that any one of the following embodiments 1 to 3 is applicable to all embodiments of the present application.

[0080] Example 1

[0081] like Figures 3 to 8 As shown, the optical imaging lens of embodiment 1 is described. Figure 3 FIG2 shows a schematic structural diagram of the optical imaging lens of Example 1 in the first state. Figure 4 FIG2 shows a schematic structural diagram of the optical imaging lens in the second state according to the first embodiment. Figure 5 FIG2 shows a schematic structural diagram of the optical imaging lens of Example 1 in the third state.

[0082] like Figures 3 to 5 As shown, the optical imaging lens includes a lens barrel P0 and, arranged in order from the object side to the image side along the optical axis of the lens barrel P0, within the lens barrel P0: a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fifth lens E5, a fifth spacer P5, a sixth lens E6, a sixth spacer P6, a seventh lens E7, a seventh spacer P7, and an eighth lens E8.

[0083] like Figure 3 2 is a schematic diagram of the structure of the optical imaging lens of this embodiment in a first state. In the first state, the object-side surface S1 of the first lens element partially abuts the lens barrel P0. The object-side surface and image-side surface of the first spacer element P1 partially abut the image-side surface S2 of the first lens element and the object-side surface S3 of the second lens element, respectively. 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 and the image-side surface of the seventh spacer P7 partially abut against the image-side surface S14 of the seventh lens and the object-side surface S15 of the eighth lens, respectively.

[0084] like Figure 4 Figure 2 shows the structure of the optical imaging lens of this embodiment in the second state. This state differs from the first state in that a seventh auxiliary spacer element P7b is further disposed between the seventh lens element E7 and the eighth lens element E8. The object-side and image-side surfaces of the seventh auxiliary spacer element P7b abut against the image-side surface of the seventh spacer element P7 and the object-side surface S15 of the eighth lens element, respectively. The abutment and support of the other spacer elements are the same as in the first state. Please refer to the relevant description of the first state and will not be repeated here.

[0085] like Figure 5 FIG. 1 is a schematic structural diagram of the optical imaging lens of this embodiment in the third state. The supporting and abutting manner of each spacer element is the same as that in the second state. Please refer to the relevant description of the second state and will not be repeated here.

[0086] In summary, the structural parameters of the optical imaging lens of Example 1 in the first state 1-1, the second state 1-2, and the third state 1-3 are shown in Table 2. (Unit: mm)

[0087] Data / Status 1-1 1-2 1-3 d1s 4.293 4.435 4.665 D1s 7.868 10.720 10.720 d2s 2.309 2.208 2.334 d2m 2.265 2.164 2.290 D2s 7.849 3.745 5.590 d3s 1.660 1.650 1.650 d3m 1.606 1.609 1.609 D3m 7.849 4.486 4.486 d4s 1.864 1.810 1.863 d5s 2.061 2.066 2.066 d6s 2.309 2.312 2.312 d7s 2.429 2.937 2.425 d7m 2.385 2.717 2.381 D0s 10.156 11.920 11.920 D0m 10.956 4.686 4.686 d0s 9.503 10.871 11.087 d0m 10.576 2.867 2.967

[0088] Table 2

[0089] In Example 1, the first lens E1 has negative focal power, with its object-side surface S1 being convex, and its image-side surface S2 being concave. The second lens E2 has negative focal power, with its object-side surface S3 being concave, and its image-side surface S4 being concave. The third lens E3 has positive focal power, with its object-side surface S5 being concave, and its image-side surface S6 being convex. The fourth lens E4 has negative focal power, with its object-side surface S7 being concave, and its image-side surface S8 being convex. The fifth lens E5 has positive focal power, with its object-side surface S9 being convex, and its image-side surface S10 being convex. The sixth lens E6 has negative focal power, with its object-side surface S11 being concave, and its image-side surface S12 being concave. The seventh lens E7 has positive focal power, with its object-side surface S13 being concave, and its image-side surface S14 being convex. The eighth lens element E8 has negative refractive power. The object-side surface S15 of the eighth lens element is convex, and the image-side surface S16 of the eighth lens element is concave.

[0090] In Example 1, the effective focal length f of the optical imaging lens is 1.310 mm, the effective focal length f1 of the first lens is -5.930 mm, the effective focal length f2 of the second lens is -3.520 mm, the effective focal length f3 of the third lens is 5.770 mm, the effective focal length f4 of the fourth lens is -835.100 mm, the effective focal length f5 of the fifth lens is 1.950 mm, the effective focal length f6 of the sixth lens is -1.950 mm, the effective focal length f7 of the seventh lens is 3.040 mm, and the effective focal length f8 of the eighth lens is -96.970 mm. The maximum half field of view Semi-FOV of the optical imaging lens is 79.050°, and the aperture number Fno of the optical imaging lens is 1.990.

[0091] Table 3 shows the basic structural parameters of the optical imaging lens of Example 1, where the effective radius is the effective radius of the light-transmitting portion of one side of the lens, and the units of the curvature radius, thickness / distance, and effective radius are all in millimeters (mm).

[0092]

[0093] Table 3

[0094] In Example 1, the object-side surface and the image-side surface of the third lens element E3 to the eighth lens element 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:

[0095]

[0096] Where x is the distance vector from the vertex of the aspheric surface at a height 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, and A20 that can be used for each aspheric mirror surface S5-S16 in Example 1.

[0097]

[0098] Table 4

[0099] Figure 6 The axial chromatic aberration curve of the optical imaging lens of Example 1 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 7 The astigmatism curve of the optical imaging lens of Example 1 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 8 The distortion curve of the optical imaging lens of Example 1 is shown, which represents the distortion magnitude values ​​corresponding to different field angles.

[0100] according to Figures 6 to 8 It can be seen that the optical imaging lens provided in Example 1 can achieve good imaging quality.

[0101] Example 2

[0102] like Figures 9 to 14 As shown, the optical imaging lens of the second embodiment is described. Figure 9 FIG2 shows a schematic structural diagram of the optical imaging lens of Example 2 in the first state. Figure 10 FIG2 shows a schematic structural diagram of the optical imaging lens of Example 2 in the second state. Figure 11 FIG2 shows a schematic structural diagram of the optical imaging lens of Example 2 in the third state.

[0103] like Figures 9 to 11As shown, the optical imaging lens includes a lens barrel P0 and, arranged in order from the object side to the image side along the optical axis of the lens barrel P0, the following lenses: a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fifth lens E5, a fifth spacer P5, a sixth lens E6, a sixth spacer P6, a seventh lens E7, a seventh spacer P7, and an eighth lens E8.

[0104] like Figure 9 2 is a schematic diagram of the structure of the optical imaging lens of this embodiment in a first state. In the first state, a fourth spacer element P4 is further disposed between the fourth lens element E4 and the fifth lens element E5. The object-side surface S1 of the first lens element partially abuts the lens barrel P0. The object-side surface and image-side surface of the first spacer element P1 partially abut the image-side surface S2 of the first lens element and the object-side surface S3 of the second lens element, respectively. 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 and image-side surfaces of the sixth spacer 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 and image-side surfaces of the seventh spacer P7 partially abut the image-side surface S14 of the seventh lens and the object-side surface S15 of the eighth lens, respectively.

[0105] like Figure 10 Figure 2 shows the structure of the optical imaging lens of this embodiment in the second state. This state differs from the first state in that no fourth spacer element P4 is provided between the fourth lens element E4 and the fifth lens element E5. Instead, the non-transparent portion of the image-side surface S8 of the fourth lens element directly abuts and supports the non-transparent portion of the object-side surface S9 of the fifth lens element. The abutment and support of the other spacer elements is the same as in the first state, and the relevant description of the first state can be referred to and will not be repeated here.

[0106] like Figure 11 FIG2 is a schematic diagram of the structure of the optical imaging lens of this embodiment in the third state. The supporting and abutting manner of each spacer element in this state is the same as that in the second state. Please refer to the relevant description of the second state and will not be repeated here.

[0107] In summary, the structural parameters of the optical imaging lens of Example 2 in the first state 2-1, the second state 2-2, and the third state 2-3 are shown in Table 5. (Unit: mm)

[0108] Data / Status 2-1 2-2 2-3 d1s 2.428 2.438 2.228 D1s 8.302 6.894 6.894 d2s 1.758 1.758 1.758 d2m 1.714 1.714 1.714 D2s 6.069 6.069 7.176 d3s 1.251 1.351 1.451 d3m 1.207 1.307 1.407 D3m 6.451 6.451 6.451 d4s 1.775 / / d5s 1.998 1.798 2.170 d6s 2.443 2.443 2.443 d7s 2.694 2.694 2.694 d7m 2.649 2.649 2.649 D0s 9.449 14.477 10.194 D0m 9.963 10.745 10.745 d0s 8.704 8.804 8.504 d0m 9.429 9.629 9.529

[0109] Table 5

[0110] In Example 2, the first lens E1 has negative focal power, with its object-side surface S1 being convex, and its image-side surface S2 being concave. The second lens E2 has negative focal power, with its object-side surface S3 being convex, and its image-side surface S4 being concave. The third lens E3 has positive focal power, with its object-side surface S5 being convex, and its image-side surface S6 being convex. The fourth lens E4 has positive focal power, with its object-side surface S7 being concave, and its image-side surface S8 being convex. The fifth lens E5 has positive focal power, with its object-side surface S9 being convex, and its image-side surface S10 being convex. The sixth lens E6 has negative focal power, with its object-side surface S11 being concave, and its image-side surface S12 being concave. The seventh lens E7 has positive focal power, with its object-side surface S13 being concave, and its image-side surface S14 being convex. The eighth lens element E8 has positive refractive power. The object-side surface S15 of the eighth lens element is convex, and the image-side surface S16 of the eighth lens element is convex.

[0111] In Example 2, the effective focal length f of the optical imaging lens is 1.033 mm, the effective focal length f1 of the first lens is -2.364 mm, the effective focal length f2 of the second lens is -3.950 mm, the effective focal length f3 of the third lens is 4.554 mm, the effective focal length f4 of the fourth lens is 130.379 mm, the effective focal length f5 of the fifth lens is 1.624 mm, the effective focal length f6 of the sixth lens is -2.066 mm, the effective focal length f7 of the seventh lens is 6.924 mm, and the effective focal length f8 of the eighth lens is 3.898 mm. The maximum half field of view Semi-FOV of the optical imaging lens is 78.000°, and the aperture number Fno of the optical imaging lens is 1.800.

[0112] Table 6 shows the basic structural parameters of the optical imaging lens of Example 2, where the effective radius is the effective radius of the light-transmitting portion of one side of the lens, and the units of the curvature radius, thickness / distance, and effective radius are all in millimeters (mm).

[0113]

[0114] Table 6

[0115] Table 7 below lists the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 of the aspheric mirror surfaces S2-S16 in Example 2. The surface shape of each aspheric surface can be defined by formula (1) given in Example 1 above.

[0116]

[0117] Table 7

[0118] Figure 12 The axial chromatic aberration curve of the optical imaging lens of Example 2 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 13 The astigmatism curve of the optical imaging lens of Example 2 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 14 The distortion curve of the optical imaging lens of Example 2 is shown, which represents the distortion values ​​corresponding to different field angles.

[0119] according to Figures 12 to 14 It can be seen that the optical imaging lens provided in the second embodiment can achieve good imaging quality.

[0120] Example 3

[0121] like Figures 15 to 20 As shown, the optical imaging lens of embodiment 3 is described. Figure 15 FIG2 shows a schematic structural diagram of the optical imaging lens of Example 3 in the first state. Figure 16 FIG2 shows a schematic structural diagram of the optical imaging lens of Example 3 in the second state. Figure 17 FIG. 4 shows a schematic structural diagram of the optical imaging lens of Example 3 in a third state.

[0122] like Figures 15 to 17 As shown, the optical imaging lens includes a lens barrel P0 and, arranged in order from the object side to the image side along the optical axis of the lens barrel P0, within the lens barrel P0: a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fifth lens E5, a fifth spacer P5, a sixth lens E6, a sixth spacer P6, a seventh lens E7, a seventh spacer P7, and an eighth lens E8.

[0123] like Figure 152 is a schematic diagram of the structure of the optical imaging lens of this embodiment in a first state. In the first state, the object-side surface S1 of the first lens element partially abuts the lens barrel P0. The object-side surface and image-side surface of the first spacer element P1 partially abut the image-side surface S2 of the first lens element and the object-side surface S3 of the second lens element, respectively. 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 and the image-side surface of the seventh spacer P7 partially abut against the image-side surface S14 of the seventh lens and the object-side surface S15 of the eighth lens, respectively.

[0124] like Figure 16 FIG2 is a schematic diagram of the structure of the optical imaging lens of this embodiment in the second state. The supporting and abutting manner of each spacer element is the same as that in the first state. Please refer to the relevant description of the first state and will not be repeated here.

[0125] like Figure 17 FIG2 is a schematic diagram of the structure of the optical imaging lens of this embodiment in the third state. The supporting and abutting manner of each spacer element is the same as that in the first state. Please refer to the relevant description of the first state and will not be repeated here.

[0126] In summary, the structural parameters of the optical imaging lens of Example 3 in the first state 3-1, the second state 3-2, and the third state 3-3 are shown in Table 8. (Unit: mm)

[0127] Data / Status 3-1 3-2 3-3 d1s 3.517 3.567 3.483 D1s 6.184 5.637 6.372 d2s 2.337 2.366 2.311 d2m 2.294 2.298 2.352 D2s 3.840 3.840 5.043 d3s 1.505 1.572 1.504 d3m 2.076 1.504 1.545 D3m 3.375 7.111 4.849 d4s 1.821 1.846 1.695 d5s 1.947 1.964 1.895 d6s 2.233 2.254 2.144 d7s 2.442 2.467 2.345 d7m 2.390 2.400 2.386 D0s 7.124 7.606 7.577 D0m 5.647 8.868 5.051 d0s 6.335 6.549 6.637 d0m 4.573 7.856 3.529

[0128] Table 8

[0129] In Example 3, the first lens E1 has negative focal power, with its object-side surface S1 being convex, and its image-side surface S2 being concave. The second lens E2 has negative focal power, with its object-side surface S3 being convex, and its image-side surface S4 being concave. The third lens E3 has positive focal power, with its object-side surface S5 being convex, and its image-side surface S6 being convex. The fourth lens E4 has positive focal power, with its object-side surface S7 being convex, and its image-side surface S8 being convex. The fifth lens E5 has positive focal power, with its object-side surface S9 being convex, and its image-side surface S10 being convex. The sixth lens E6 has negative focal power, with its object-side surface S11 being concave, and its image-side surface S12 being concave. The seventh lens E7 has positive focal power, with its object-side surface S13 being concave, and its image-side surface S14 being convex. The eighth lens element E8 has positive refractive power. The object-side surface S15 of the eighth lens element is convex, and the image-side surface S16 of the eighth lens element is concave.

[0130] In Example 3, the effective focal length f of the optical imaging lens is 1.547 mm, the effective focal length f1 of the first lens is -5.321 mm, the effective focal length f2 of the second lens is -3.192 mm, the effective focal length f3 of the third lens is 5.324 mm, the effective focal length f4 of the fourth lens is 12.536 mm, the effective focal length f5 of the fifth lens is 2.195 mm, the effective focal length f6 of the sixth lens is -2.879 mm, the effective focal length f7 of the seventh lens is 4.331 mm, and the effective focal length f8 of the eighth lens is 89.428 mm. The maximum half field of view Semi-FOV of the optical imaging lens is 84.000°, and the aperture number Fno of the optical imaging lens is 1.991.

[0131] Table 9 shows the basic structural parameters of the optical imaging lens of Example 3, where the effective radius is the effective radius of the light-transmitting portion of one side of the lens, and the units of the curvature radius, thickness / distance, and effective radius are all in millimeters (mm).

[0132]

[0133] Table 9

[0134] Table 10 below lists the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for the aspheric mirror surfaces S5-S16 in Example 3. The surface shape of each aspheric surface can be defined by formula (1) given in Example 1 above.

[0135]

[0136] Table 10

[0137] Figure 18 The axial chromatic aberration curve of the optical imaging lens of Example 3 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 19 The astigmatism curve of the optical imaging lens of Example 3 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 20 The distortion curve of the optical imaging lens of Example 3 is shown, which represents the distortion magnitude values ​​corresponding to different field angles.

[0138] according to Figures 18 to 20 It can be seen that the optical imaging lens provided in Example 3 can achieve good imaging quality.

[0139] In summary, Examples 1 to 3 respectively satisfy the relationships shown in Table 11.

[0140]

[0141]

[0142] Table 11

[0143] It should be noted that in Table 11, 1-1 represents the optical imaging lens of Example 1 in the first state, 1-2 represents the optical imaging lens of Example 1 in the second state, 1-3 represents the optical imaging lens of Example 1 in the third state, 2-1 represents the optical imaging lens of Example 2 in the first state, 2-2 represents the optical imaging lens of Example 2 in the second state, 2-3 represents the optical imaging lens of Example 2 in the third state, 3-1 represents the optical imaging lens of Example 3 in the first state, 3-2 represents the optical imaging lens of Example 3 in the second state, and 3-3 represents the optical imaging lens of Example 3 in the third state.

[0144] Table 12 shows the effective focal length f of the optical imaging lenses of Examples 1 to 3, the effective focal length of each lens, etc.

[0145] Data / Example Example 1 Example 2 Example 3 Semi-FOV(°) 79.050 78.000 84.000 f(mm) 1.310 1.033 1.547 Fno 1.990 1.800 1.991 f1(mm) -5.930 -2.364 -5.321 f2(mm) -3.520 -3.950 -3.192 f3(mm) 5.770 4.554 5.324 f4(mm) -835.100 130.379 12.536 f5(mm) 1.950 1.624 2.195 f6(mm) -1.950 -2.066 -2.879 f7(mm) 3.040 6.924 4.331 f8(mm) -96.970 3.898 89.428

[0146] Table 12

[0147] 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 lens described above.

[0148] 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.

[0149] 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.

[0150] 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.

[0151] 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 lens, characterized in that: It includes a lens barrel, a lens group and a plurality of spacer elements arranged in the lens barrel. The lens barrel has an object-side end face, an image-side end face, an outer ring face and an inner ring face, and at least part of the inner ring face is stepped. The lens group sequentially includes, 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, and there is an air gap between two adjacent lenses from the first lens to the eighth lens. The plurality of spacer elements include a first spacer element located between the first lens and the second lens and partially contacting the image-side face of the first lens, a second spacer element located between the second lens and the third lens and partially contacting the image-side face of the second lens, a third spacer element located between the third lens and the fourth lens and partially contacting the image-side face of the third lens, a fifth spacer element located between the fifth lens and the sixth lens and partially contacting the image-side face of the fifth lens, a sixth spacer element located between the sixth lens and the seventh lens and partially contacting the image-side face of the sixth lens, and a seventh spacer element located between the seventh lens and the eighth lens and partially contacting the image-side face of the seventh lens. The maximum semi-field angle Semi-Fov of the optical imaging lens satisfies: 78° ≤ Semi-FOV ≤ 84°; the effective diameter DT11 of the light-transmitting part of the object-side face of the first lens and the effective diameter DT81 of the light-transmitting part of the object-side face of the eighth lens satisfy: 2.1 < DT11 / DT81 < 3.75; the inner diameter d0s of the object-side face of the lens barrel, the inner diameter d0m of the image-side face of the lens barrel, the effective diameter DT11 of the light-transmitting part of the object-side face of the first lens and the effective diameter DT82 of the light-transmitting part of the image-side face of the eighth lens satisfy: -0.50 ≤ (d0s - d0m) / (DT11 - DT82) < 1.

3.

2. The optical imaging lens according to claim 1, wherein: When -0.6 < (d0s - d0m) / (DT11 - DT82) < 0 is satisfied, both the object-side face and the image-side face of the non-light-transmitting part of the eighth lens have a wavy structure.

3. The optical imaging lens according to claim 2, wherein: When -0.6 < (d0s - d0m) / (DT11 - DT82) < 0 is satisfied, at least one of the object-side face and the image-side face of the non-light-transmitting part of the seventh lens has the wavy structure, and the wavy structure is selectively provided on the object-side face and the image-side face of the non-light-transmitting part of the sixth lens.

4. The optical imaging lens according to claim 2 or 3, wherein: The ratio of the projected area of the wavy structure on the surface of the non-light-transmitting part where it is located to the surface area of the non-light-transmitting part where it is located is greater than or equal to 50% and less than or equal to 100%.

5. The optical imaging lens according to claim 1, wherein: The inner diameter d1s of the object-side face of the first spacer element, the effective focal length f1 of the first lens and the effective focal length f of the second lens satisfy: -2.9 < (f1 + f2) / d1s < -2.

6. The optical imaging lens according to claim 1, wherein: The inner diameter d2s of the object side surface of the second spacer element, the inner diameter d2m of the image side surface of the second spacer element, the curvature radius R4 of the image side surface of the second lens and the curvature radius R5 of the object side surface of the third lens satisfy: 1 <d2s / R4-d2m / R5<1.5。 7. The optical imaging lens according to claim 1, wherein: The outer diameter D1s of the object side surface of the first spacer element, the outer diameter D2s of the object side surface of the second spacer element, the effective diameter DT12 of the light-transmitting portion of the image side surface of the first lens, and the effective diameter DT22 of the light-transmitting portion of the image side surface of the second lens satisfy the following relationship: 3.2 <D1s / DT12+D2s / DT22<6.8。 8. The optical imaging lens according to claim 1, wherein: Among the plurality of spacer elements, the inner diameter d3s of the object-side surface of the third spacer element is the smallest.

9. The optical imaging lens according to claim 1, wherein: The effective diameter DT11 of the light-transmitting portion on the object side of the first lens, the effective diameter DT82 of the light-transmitting portion on the image side of the eighth lens, and the inner diameter d3s of the object side of the third spacer element satisfy the following relationship: 1.6 <DT11 / d3s-DT82 / d3s<3.9。 10. The optical imaging lens according to claim 1, wherein: The inner diameter d1s of the object side surface of the first spacer element, the inner diameter d3s of the object side surface of the third spacer element, the effective focal length f1 of the first lens and the effective focal length f3 of the third lens satisfy: -0.3<(d1s-d3s) / (f1-f3)<-0.1.

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