Optical imaging lens

Abstract

The invention 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. The optical imaging lens solves the problem that the optical imaging lens in the prior art meets a large field angle, so that the aperture of the lens is increased, and the assembly stability is affected.

Description

Technical Field

[0001] The present invention relates to the technical field of optical imaging equipment, and in particular to an optical imaging lens. Background Art

[0002] As the requirements for optical imaging lenses installed in devices such as smartphones, drones, and security cameras continue to increase, optical imaging lenses with a large field of view are widely used because they can capture a wider scene. However, in order to match the large field of view, the current optical imaging lenses usually increase the lens diameter, but the increase in lens diameter will lead to an increase in the overall volume and weight of the optical imaging lens, and at the same time make the edge light of the lens steeper, affecting the assembly stability of the lens, and thus affecting the assembly stability of the optical imaging lens.

[0003] That is to say, the optical imaging lens in the prior art has the problem that in order to meet the large field of view angle, the lens aperture increases, thereby affecting the assembly stability. Summary of the invention

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

[0005] To achieve the above object, according to one aspect of the present invention, there is provided an optical imaging lens, comprising 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 in partial contact with the image-side surface of the first lens, a second spacer element located between the second lens and the third lens and in partial contact with the image-side surface of the second lens, a third spacer element located between the third lens and the fourth lens and in partial contact with the image-side surface of the third lens, a fifth spacer element located between the fifth lens and the sixth lens and in partial contact with the image-side surface of the fifth lens, a sixth spacer element located between the sixth lens and the seventh lens and in partial contact with the image-side surface of the sixth lens, and a seventh spacer element located between the seventh lens and the eighth lens and in partial contact with 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 invention, an optical imaging lens is further provided, which 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 in partial contact with the image-side face of the first lens, a second spacer element located between the second lens and the third lens and in partial contact with the image-side face of the second lens, a third spacer element located between the third lens and the fourth lens and in partial contact with the image-side face of the third lens, a fifth spacer element located between the fifth lens and the sixth lens and in partial contact with the image-side face of the fifth lens, a sixth spacer element located between the sixth lens and the seventh lens and in partial contact with the image-side face of the sixth lens, and a seventh spacer element located between the seventh lens and the eighth lens and in partial contact with 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 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 part 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 part of the seventh lens has a wavy structure, and the object-side face and the image-side face of the non-light-transmitting part 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 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%.

[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 spacing element, the inner diameter d2m of the image side surface of the second spacing 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。

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

[0016] Furthermore, an inner diameter d3m of the image side surface of the third spacer element, an outer diameter D3m of the image side surface of the third spacer element and an 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] Further, when a fourth spacing element is disposed between the fourth lens and the fifth lens, an inner diameter d3s of the object-side surface of the third spacing element and an inner diameter d4s of the object-side surface of the fourth spacing element satisfy: 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) + (D0m / d7m) < 10.

[0021] Applying the technical solution of the present invention, the optical imaging lens of the present application is composed 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 78° ≤ Semi - FOV ≤ 84° and 2.1 < DT11 / DT81 < 3.75, it can meet the ultra - wide - angle requirement. However, in this case, the effective diameter of the first lens is more than twice the effective diameter 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 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 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, 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 caused by meeting the large field - of - view angle, and at the same time, the inner diameter of the lens barrel can be restricted within a reasonable range, ensuring a relatively small overall size of the optical imaging lens. Controlling the lens size is beneficial to avoiding the problem of steep refraction of marginal rays, beneficial to ensuring the smoothness of marginal ray refraction, 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 specification drawings forming a part of the present application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0023] Figure 1 Shows the dimension marking diagram of the optical imaging lens of an alternative embodiment of the present invention;

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

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

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

[0027] Figure 5 A schematic structural diagram of an optical imaging lens in a third state according to a first embodiment of the present invention is shown;

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

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

[0030] Fig.10 A schematic structural diagram of an optical imaging lens in a second state according to a second embodiment of the present invention is shown;

[0031] Fig.11 A schematic structural diagram of an optical imaging lens in a third state according to a second embodiment of the present invention is shown;

[0032] Figure 12 to Figure 14 The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the optical imaging lens of the second embodiment of the present invention are respectively shown;

[0033] Fig.15 A schematic structural diagram of an optical imaging lens in a first state according to a third embodiment of the present invention is shown;

[0034] Fig.16 A schematic structural diagram of an optical imaging lens in a second state according to a third embodiment of the present invention is shown;

[0035] Fig.17 A schematic diagram showing the structure of an optical imaging lens in a third state according to a third embodiment of the present invention is shown;

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

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

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

[0039] Fig.23 The MTF defocus curve diagram is shown when the optical imaging lens according to an alternative embodiment of the present invention 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 of the first lens; S2, image side of the first lens; E2, second lens; S3, object side of the second lens; S4, image side of the second lens; E3, third lens; S5, object side of the third lens; S6, image side of the third lens; E4, fourth lens; S7, object side of the fourth lens; S8, image side of the fourth lens; E5, fifth lens; S9, object side of the fifth lens; S10, image side of the fifth lens; E6, sixth lens; S11, object side of the sixth lens; S12, image side of the sixth lens; E7, seventh lens; S13, object side of the seventh lens; S14, image side of the seventh lens; E8, eighth lens; S15, object side of the eighth lens; S16, image side 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, wavy structure. Detailed implementation manners

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

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

[0044] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; 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-mentioned directional words are not used to limit the present invention.

[0045] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0046] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are 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 the general knowledge in this field, and the positive and negative R value (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) is used to judge the concave and convex. For the object side, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; for the image side, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface. 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 causes an increase in lens aperture, thereby affecting assembly stability, the present invention provides an optical imaging lens.

[0049] like Figures 1 to 23As shown, in an alternative 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 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 portion of the object-side face of the first lens, and the effective diameter DT82 of the light-transmitting portion of the image-side face of the eighth lens satisfy: -0.50 ≤ (d0s - d0m) / (DT11 - DT82) < 1.3.

[0050] The optical imaging lens of the present application is composed 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 78° ≤ Semi-FOV ≤ 84° and 2.1 < DT11 / DT81 < 3.75, an ultra-wide angle can be achieved. 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 constrains -0.50 ≤ (d0s - d0m) / (DT11 - DT82) < 1.3, reasonably constraining 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 caused by meeting a large field of view angle, and at the same time being able to constrain the inner diameter of the lens barrel within a reasonable range, ensuring a relatively small overall size of the optical imaging lens. Controlling the lens size is beneficial to avoiding the problem of steep refraction of marginal rays, beneficial to ensuring the smoothness of marginal ray refraction, thereby enhancing the assembly stability of the lens in the lens barrel, ensuring that the lens can be stably borne, and further ensuring the assembly sensitivity of the optical imaging lens and enhancing 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 Figure 21 to Figure 23 as shown, Fig.21 shows the MTF defocus curve graph when the optical imaging lens satisfies (d0s - d0m) / (DT11 - DT82) = 0.68, Fig. 22 shows the MTF defocus curve graph when the optical imaging lens satisfies (d0s - d0m) / (DT11 - DT82) = -1.21, Fig.23 shows the MTF defocus curve graph when the optical imaging lens satisfies (d0s - d0m) / (DT11 - DT82) = 1.77. From Table 1, Fig.21 , Fig. 22 and Fig.23As shown, when (d0s-d0m) / (DT11-DT82)=-1.21, the MTF defocus curve performs poorly. At this time, d0m is too large, resulting in a decrease in the bearing stability of the lens and an increase in the external field of view dispersion. When (d0s-d0m) / (DT11-DT82)=1.77, the MTF defocus 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 defocus curve performs better, 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, and 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 is conducive to 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 the imaging quality.

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

[0053] Table 1

[0054] It should be noted that any of the above-mentioned first to eighth lenses is composed of a light-transmitting portion and a non-light-transmitting portion, the non-light-transmitting portion is located on the outer peripheral side of the light-transmitting portion and is arranged along the circumference of the light-transmitting portion, and the two are connected. The light-transmitting portion is used for the imaging light to pass through; the non-light-transmitting portion is not used for the imaging light to pass through, and is used to abut against an adjacent lens, a spacer element or a lens barrel.

[0055] like Figure 2As shown, when -0.6<(d0s-d0m) / (DT11-DT82)<0 is satisfied, both the object side and the image side of the non-light-transmitting portion of the eighth lens have a wave structure 10. The wave structure 10 refers to a continuous, regular or irregular undulating structure formed on the non-light-transmitting portions of the object side and the image side 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 wave structure 10 is provided to introduce tiny light scattering, so that when the light passes through the wave 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 wave 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 image 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 wave 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 wave 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 wave structure 10. In other words, the object side surface and the image side surface of the non-light-transmitting portion of the sixth lens can both be provided with a wave structure 10, or the wave structure 10 can be provided on one of the object side surface and the image side surface of the non-light-transmitting portion of the sixth lens, or the wave structure 10 is not provided on the object side surface and the image side surface of the non-light-transmitting portion of the sixth lens. The specific number and setting position of the wave structure 10 can be set according to actual needs. By adding the wave 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 projection area of ​​the wave structure 10 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%. In other words, the area of ​​the wave structure 10 occupies at least half of the area of ​​the object side or image side of the non-light-transmitting portion where it is located. By constraining the ratio of the projection area of ​​the wave structure 10 to the surface 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 to reduce the temperature of the lens and ensure the thermal stability of the optical imaging lens.

[0058] In this embodiment, the following relationship is satisfied among 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: -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. Meanwhile, it is beneficial to reduce unnecessary reflections, scattering, and aberrations, thereby improving the imaging quality.

[0059] In this embodiment, the following relationship is satisfied among 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: 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 following relationship is satisfied among 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: 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 following relationship is satisfied among 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: 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 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. By controlling the relationship between the inner diameter of the spacer element and the effective focal length of the lens, it is beneficial to optimize the optical path, ensure that the light maintains an appropriate path and distribution when passing through the lens and the spacer element, and can reduce the deflection, scattering and unnecessary reflection of the light, thereby improving the imaging quality.

[0064] In this embodiment, 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. By controlling the ratio of the wall thickness of the third spacer element to the effective diameter of the light-transmitting portion of the adjacent lens, the compact design of the optical imaging lens can be achieved while ensuring the optical performance, and the thinner third spacer element is conducive to reducing the volume and weight of the entire optical imaging lens.

[0065] In this embodiment, the plurality of spacer elements also include a fourth spacer element selectively disposed between the fourth lens and the fifth lens and in contact with the image side surface portion of the fourth lens, that is, the fourth spacer element is disposed or not 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, which is beneficial to reducing the situation of lens position deviation caused by vibration or impact, and is beneficial to improving the assembly stability and reliability of the optical imaging lens.

[0066] In this embodiment, when a fourth spacer element is provided between the fourth lens and the fifth lens, 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: 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 the dimensional stability thereof directly affects the stability of the relative position of the lenses. Therefore, by reasonably controlling the size of the spacer element, the position deviation of the lens caused by vibration or impact can be reduced, thereby improving the clarity and stability of the imaging.

[0067] In this embodiment, the inner diameters of the fifth spacer element, the sixth spacer element and the seventh spacer element gradually increase from the fifth spacer element to the seventh spacer element, and 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 satisfy: 0.3<(d7s-d6s) / (d6s-d5s)<2.6. By setting the inner diameters of the fifth spacer element, the sixth spacer element and the seventh spacer element to gradually increase in a step-like manner, it is beneficial to enhance the stability of the optical imaging lens. As a supporting and abutting component between adjacent lenses, the stability and reliability of the spacer element have an important influence on the performance of the entire optical system. Therefore, by controlling the growth trend of the inner diameters of multiple spacer elements, it is possible to ensure that the relative positions between the multiple spacer elements are relatively stable, reducing the risk of lens position displacement due to vibration or impact.

[0068] In this embodiment, the inner diameter d1s of the object side surface of the first spacing element, the inner diameter d7m of the image side surface of the seventh spacing 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 satisfy: 4.2<(D0s / d1s)+(D0m / d7m)<10. By planning the proportional relationship between the outer diameter of the lens barrel and the inner diameter of the spacing element, it is helpful to optimize the coordination between the lens barrel and the spacing element, ensure that the lens barrel and the spacing element can be tightly and stably connected together, thereby maintaining the overall structural stability of the optical imaging lens and ensuring assembly stability.

[0069] In this embodiment, the first lens has negative focal power, the second lens has negative focal power, the third lens has positive focal power, the fifth lens has positive focal power, the sixth lens has negative focal power, and the seventh lens has positive focal power. Reasonable planning of the focal power of each lens is conducive to planning the transmission path of light, which can ensure the smooth and stable transmission of light and the stability of imaging.

[0070] In addition, in another alternative 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 easily affects 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 formulas 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 a photosensitive element located on the imaging surface.

[0074] The optical imaging lens 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 characteristics of an aspherical lens are: 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.

[0075] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the optical imaging lens can be changed to obtain the various results and advantages described in this specification. For example, although eight lenses are described as an example in the embodiments, the optical imaging lens is not limited to including eight lenses. If necessary, the optical imaging lens may also include other numbers of lenses.

[0076] Figure 1 FIG. 1 shows a schematic diagram of the structure of an optical imaging lens of the present application. Figure 1 Parameters such as d1s, D1s, d2s, d2m, D2s, d3s, d3m, D3m, d4s, d5s, d6s, d7s, d7m, D0s, D0m, d0s, and d0m are indicated in the figure to clearly and intuitively understand the meaning of the parameters. In order to facilitate the description of the optical imaging lens and the surface shape of the specific lens, these parameters will no longer be reflected in the drawings when describing the specific embodiments later.

[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 a first state, a second state and a third state, and in the first state, the second state and the third state of the same embodiment, the parameters such as the curvature radius, the center thickness of the first lens to the eighth lens, the spacing distance between the lenses and the coefficient of the higher order terms are the same, but the parameters such as the thickness, the inner diameter and the outer diameter of the lens barrel, the first spacer element to the seventh spacer element and the shape of some lenses are different. In other words, the main structure for imaging is the same, but the auxiliary structure for imaging is different.

[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] Embodiment 1

[0081] like Figures 3 to 8 As shown, the optical imaging lens of the first embodiment is described. Figure 3 FIG. 1 is a schematic diagram showing the structure of the optical imaging lens of Embodiment 1 in a first state. Figure 4 FIG. 4 is a schematic diagram showing the structure of the optical imaging lens in the first embodiment in the second state. Figure 5 A schematic structural diagram of the optical imaging lens of Embodiment 1 in a third state is shown.

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

[0083] like Figure 3 As shown, it is a structural schematic diagram of the optical imaging lens of this embodiment in the first state. In the first state, the object side surface S1 of the first lens partially abuts against the lens barrel P0. The object side surface and image side surface of the first spacer element P1 partially abut against the image side surface S2 of the first lens and the object side surface S3 of the second lens respectively. The object side surface and image side surface of the second spacer element P2 partially abut against 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 against 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 against 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 against 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 against the image side surface S12 of the sixth lens and the object side surface S13 of the seventh lens respectively. The object-side surface and the image-side surface of the seventh spacer element P7 are in partial contact with the image-side surface S14 of the seventh lens and the object-side surface S15 of the eighth lens, respectively.

[0084] like Figure 4 , which is a schematic diagram of the structure of the optical imaging lens of this embodiment in the second state. The difference between this state and the first state is that a seventh auxiliary spacer element P7b is further provided between the seventh lens E7 and the eighth lens E8. The object side surface and the image side surface of the seventh auxiliary spacer element P7b are respectively abutted against the image side surface of the seventh spacer element P7 and the object side surface S15 of the eighth lens. The abutment manner of other spacer elements is the same as that of the first state, and the relevant description in the first state may be referred to, which will not be repeated here.

[0085] like Figure 5 , which is a schematic structural diagram of the optical imaging lens of this embodiment in the third state. The supporting and abutting manner of each spacing element is the same as that in the second state. Please refer to the relevant description in the second state, which 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 Embodiment 1, the first lens E1 has negative power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has negative power, the object side surface S3 of the second lens is concave, and the image side surface S4 of the second lens is concave. The third lens E3 has positive power, the object side surface S5 of the third lens is concave, and the image side surface S6 of the third lens is convex. The fourth lens E4 has negative power, the object side surface S7 of the fourth lens is concave, and the image side surface S8 of the fourth lens is convex. The fifth lens E5 has positive power, the object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is convex. The sixth lens E6 has negative power, the object side surface S11 of the sixth lens is concave, and the image side surface S12 of the sixth lens is concave. The seventh lens E7 has positive power, the object side surface S13 of the seventh lens is concave, and the image side surface S14 of the seventh lens is convex. The eighth lens E8 has negative refractive power, the object-side surface S15 of the eighth lens is a convex surface, and the image-side surface S16 of the eighth lens is a concave surface.

[0090] In Embodiment 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, 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 a basic structural parameter table of the optical imaging lens of Example 1, wherein 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 millimeters.

[0092]

[0093] Table 3

[0094] In the first embodiment, the object-side surface and the image-side surface of the third lens E3 to the eighth lens E8 are all aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0095]

[0096] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R, that is, the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above; k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 4 below gives the high-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 the first embodiment 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 the first embodiment is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 8 The distortion curve of the optical imaging lens of the first embodiment is shown, which indicates 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 the first embodiment can achieve good imaging quality.

[0101] Embodiment 2

[0102] like Figures 9 to 14 As shown, the optical imaging lens of the second embodiment is described. Fig. 9 FIG. 1 shows a schematic structural diagram of the optical imaging lens of Embodiment 2 in a first state. Fig.10 FIG. 2 shows a schematic structural diagram of the optical imaging lens of Embodiment 2 in a second state. Fig.11 A schematic structural diagram of the optical imaging lens of the second embodiment in a third state is shown.

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

[0104] like Fig. 9 , which is a schematic diagram of the structure of the optical imaging lens of the present embodiment in the first state. In the first state, a fourth spacer element P4 is further provided between the fourth lens E4 and the fifth lens E5. The object side surface S1 of the first lens partially abuts against the lens barrel P0. The object side surface and the image side surface of the first spacer element P1 partially abut against the image side surface S2 of the first lens and the object side surface S3 of the second lens, respectively. The object side surface and the image side surface of the second spacer element P2 partially abut against 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 the image side surface of the third spacer element P3 partially abut against 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 the image side surface of the fourth spacer element P4 partially abut against 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 the image side surface of the fifth spacer element P5 partially abut against 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 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 and image side surface 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 Fig.10 , which is a schematic diagram of the structure of the optical imaging lens of this embodiment in the second state. The difference between this state and the first state is that the fourth spacer element P4 is not provided between the fourth lens E4 and the fifth lens E5, and the non-light-transmitting portion of the image side surface S8 of the fourth lens directly abuts against the non-light-transmitting portion of the object side surface S9 of the fifth lens. The abutting manner of other spacer elements is the same as that of the first state, and the relevant description in the first state may be referred to, and no further description is given here.

[0106] like Fig.11 FIG. 1 is a schematic diagram of the structure of the optical imaging lens of this embodiment in the third state. The abutment manner of each spacing element in this state is the same as that in the second state, and the relevant description in the second state can be referred to, which will not be repeated here.

[0107] In summary, the structural parameters of the optical imaging lens of the second embodiment 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 the second embodiment, the first lens E1 has negative power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has negative power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens E3 has positive power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is convex. The fourth lens E4 has positive power, the object side surface S7 of the fourth lens is concave, and the image side surface S8 of the fourth lens is convex. The fifth lens E5 has positive power, the object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is convex. The sixth lens E6 has negative power, the object side surface S11 of the sixth lens is concave, and the image side surface S12 of the sixth lens is concave. The seventh lens E7 has positive power, the object side surface S13 of the seventh lens is concave, and the image side surface S14 of the seventh lens is convex. The eighth lens E8 has positive refractive power, the object-side surface S15 of the eighth lens is a convex surface, and the image-side surface S16 of the eighth lens is a convex surface.

[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, 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 a basic structural parameter table of the optical imaging lens of Example 2, wherein 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 millimeters (mm).

[0113]

[0114] Table 6

[0115] Table 7 below gives the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspherical mirror surface S2-S16 in Example 2. Among them, the surface shape of each aspherical surface can be defined by the formula (1) given in the above-mentioned Example 1.

[0116]

[0117] Table 7

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

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

[0120] Embodiment 3

[0121] like Figures 15 to 20 As shown, the optical imaging lens of embodiment 3 is described. Fig.15 FIG. 1 shows a schematic structural diagram of the optical imaging lens of Embodiment 3 in a first state. Fig.16 FIG. 4 is a schematic diagram showing the structure of the optical imaging lens of Embodiment 3 in the second state. Fig.17 A schematic structural diagram of the optical imaging lens of Embodiment 3 in a third state is shown.

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

[0123] like Fig.15As shown, it is a structural schematic diagram of the optical imaging lens of this embodiment in the first state. In the first state, the object side surface S1 of the first lens partially abuts against the lens barrel P0. The object side surface and image side surface of the first spacer element P1 partially abut against the image side surface S2 of the first lens and the object side surface S3 of the second lens respectively. The object side surface and image side surface of the second spacer element P2 partially abut against 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 against 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 against 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 against 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 against the image side surface S12 of the sixth lens and the object side surface S13 of the seventh lens respectively. The object-side surface and the image-side surface of the seventh spacer element P7 are in partial contact with the image-side surface S14 of the seventh lens and the object-side surface S15 of the eighth lens, respectively.

[0124] like Fig.16 FIG. 1 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 spacing element is the same as that in the first state, and the relevant description in the first state can be referred to, which will not be repeated here.

[0125] like Fig.17 FIG. 1 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 spacing element is the same as that in the first state, and the relevant description in the first state can be referred to, which will not be repeated here.

[0126] In summary, the structural parameters of the optical imaging lens of the third embodiment 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 the third embodiment, the first lens E1 has negative power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has negative power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens E3 has positive power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is convex. The fourth lens E4 has positive power, the object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is convex. The fifth lens E5 has positive power, the object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is convex. The sixth lens E6 has negative power, the object side surface S11 of the sixth lens is concave, and the image side surface S12 of the sixth lens is concave. The seventh lens E7 has positive power, the object side surface S13 of the seventh lens is concave, and the image side surface S14 of the seventh lens is convex. The eighth lens E8 has positive refractive power, the object-side surface S15 of the eighth lens is a convex surface, and the image-side surface S16 of the eighth lens is a concave surface.

[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, 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 a basic structural parameter table of the optical imaging lens of Example 3, wherein 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 millimeters (mm).

[0132]

[0133] Table 9

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

[0135]

[0136] Table 10

[0137] Fig.18 The axial chromatic aberration curve of the optical imaging lens of the third embodiment is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Fig.19 The astigmatism curve of the optical imaging lens of the third embodiment is shown, which represents the meridional image curvature and the sagittal image curvature. Fig. 20 The distortion curve of the optical imaging lens of the third embodiment is shown, which indicates 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 the third embodiment can achieve good imaging quality.

[0139] In summary, Embodiment 1 to Embodiment 3 respectively satisfy the relationship 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 in Example 1 in the first state, 1-2 represents the optical imaging lens in Example 1 in the second state, 1-3 represents the optical imaging lens in Example 1 in the third state, 2-1 represents the optical imaging lens in Example 2 in the first state, 2-2 represents the optical imaging lens in Example 2 in the second state, 2-3 represents the optical imaging lens in Example 2 in the third state, 3-1 represents the optical imaging lens in Example 3 in the first state, 3-2 represents the optical imaging lens in Example 3 in the second state, and 3-3 represents the optical imaging lens in 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 Embodiment 1 Embodiment 2 Embodiment 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, whose electronic photosensitive element can be a photosensitive coupled device (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated in a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

[0148] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. 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, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0150] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0151] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An optical imaging lens, characterized in that: Comprising 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 in partial contact with the image-side surface of the first lens, a second spacer element located between the second lens and the third lens and in partial contact with the image-side surface of the second lens, a third spacer element located between the third lens and the fourth lens and in partial contact with the image-side surface of the third lens, a fifth spacer element located between the fifth lens and the sixth lens and in partial contact with the image-side surface of the fifth lens, a sixth spacer element located between the sixth lens and the seventh lens and in partial contact with the image-side surface of the sixth lens, and a seventh spacer element located between the seventh lens and the eighth lens and in partial contact with 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.

2. The optical imaging lens according to claim 1, wherein: When -0.6 < (d0s - d0m) / (DT11 - DT82) < 0 is satisfied, both the object-side surface and the image-side surface of the light-blocking portion 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 surface and the image-side surface of the light-blocking portion of the seventh lens has the wavy structure, and the object-side surface and the image-side surface of the light-blocking portion of the sixth lens are selectively provided with the wavy structure.

4. The optical imaging lens according to claim 2 or 3, characterized in that: The ratio of the projected area of the wavy structure on the surface of the light-blocking portion where it is located to the surface area of the light-blocking portion 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 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.

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: 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 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 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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