Optical imaging lens

Abstract

The utility model discloses an optical imaging lens, the optical imaging lens comprises a lens barrel, and a lens group and a spacing element group which 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 in sequence from an object side to an image side along an optical axis, the first lens, the fourth lens and the fifth lens all have positive focal power, and the second lens, the third lens, the sixth lens, the seventh lens and the eighth lens all have negative focal power; the spacing element group comprises a fifth spacing element, a sixth spacing element and a seventh spacing element; the optical imaging lens satisfies the following conditions: 5.8 lt; f / EP56 + f / EP67lt; 6.2 and-2.8 lt, 6.2 and-2.8 lt; f78 / EP 67lt; f is the effective focal length of the optical imaging lens, EP56 is the spacing distance between the image side surface of the fifth spacing element and the object side surface of the sixth spacing element along the optical axis direction, f78 is the combined focal length of the seventh lens and the eighth lens, and EP67 is the spacing distance between the image side surface of the sixth spacing element and the object side surface of the seventh spacing element along the optical axis direction.

Description

Technical Field

[0001] This application relates to the field of optical elements, and specifically, to an optical imaging lens. Background Art

[0002] With the rapid development of science and technology, people have higher and higher requirements for the imaging quality of lenses of electronic devices such as smart phones. In order to improve the resolution of the lens, the number of lenses is also increasing. Among them, the eight-element optical lens has received more and more attention and has become one of the mainstream lenses. However, the increase in the number of lenses is not conducive to the miniaturization of the optical lens on the one hand, and on the other hand, it poses a great challenge to the assembly stability of the lens. In particular, the inner and outer diameter sizes of the spacer elements and the bearing design between the lens and the lens barrel need to be considered by designers to ensure the performance of the assembled lens and the yield rate during the production process.

[0003] In addition, the radial step difference between the sixth lens and the seventh lens of the eight-element optical lens is usually relatively large, which will cause the sixth lens to be subjected to a large force during assembly and is prone to deformation, thereby affecting the overall assembly stability and resulting in poor imaging quality of the lens. Therefore, how to make the distribution design of the lens and the spacer element more reasonable and improve the assembly stability of the lens has always been one of the research directions of current technicians in this field. Summary of the Utility Model

[0004] The first aspect of this application provides such an optical imaging lens, which includes: a lens barrel, and a lens group and a spacer element group disposed in the lens barrel. Among them, the lens group includes, in order from the object side to the image side along the optical axis: 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. Among them, the first lens, the fourth lens, and the fifth lens all have positive optical powers, and the second lens, the third lens, the sixth lens, the seventh lens, and the eighth lens all have negative optical powers; the spacer element group includes: a fifth spacer element, a sixth spacer element, and a seventh spacer element. The fifth spacer element is disposed between the fifth lens and the sixth lens and is at least partially in contact with the image side surface of the fifth lens. The sixth spacer element is disposed between the sixth lens and the seventh lens and is at least partially in contact with the image side surface of the sixth lens. The seventh spacer element is disposed between the seventh lens and the eighth lens and is at least partially in contact with the image side surface of the seventh lens; the optical imaging lens satisfies: 5.8 < f / EP56 + f / EP67 < 6.2 and -2.8 < f78 / EP67 < -2.0, where f is the effective focal length of the optical imaging lens, EP56 is the interval distance along the optical axis between the image side surface of the fifth spacer element and the object side surface of the sixth spacer element, EP67 is the interval distance along the optical axis between the image side surface of the sixth spacer element and the object side surface of the seventh spacer element, and f78 is the combined focal length of the seventh lens and the eighth lens.

[0005] In one embodiment, the spacer element group further includes: a second spacer element disposed between the second lens and the third lens and at least partially in contact with the image side surface of the second lens; the optical imaging lens satisfies: 1.4 < D2s / R3 < 1.8, where D2s is the outer diameter of the object side surface of the second spacer element in a direction perpendicular to the optical axis, and R3 is the radius of curvature of the object side surface of the second lens.

[0006] In one embodiment, the optical imaging lens satisfies: 0.3 < |SAG71| / EP67 < 0.45, where SAG71 is the axial distance between the intersection of the object side surface of the seventh lens and the optical axis and the vertex of the effective radius of the object side surface of the seventh lens, and EP67 is the spacing distance between the image side surface of the sixth spacer element and the object side surface of the seventh spacer element in the optical axis direction.

[0007] In one embodiment, the spacer element group further includes: a first spacer element disposed between the first lens and the second lens and at least partially in contact with the image side surface of the first lens; the optical imaging lens satisfies: 2.15 < EP01 / CT1 < 3.35, where EP01 is the spacing distance between the object side end surface of the lens barrel and the object side surface of the first spacer element in the optical axis direction, and CT1 is the central thickness of the first lens on the optical axis.

[0008] In one embodiment, the spacer element group further includes: a first spacer element disposed between the first lens and the second lens and at least partially in contact with the image side surface of the first lens; the optical imaging lens satisfies: 13.7 < EP01 / |SAG12| < 22.7, where EP01 is the spacing distance between the object side end surface of the lens barrel and the object side surface of the first spacer element in the optical axis direction, and SAG12 is the axial distance between the intersection of the image side surface of the first lens and the optical axis and the vertex of the effective radius of the image side surface of the first lens.

[0009] In one embodiment, the spacer element group further includes a fifth auxiliary spacer element disposed on the image side of the fifth spacer element and at least partially in contact with the image side surface of the fifth spacer element; the optical imaging lens satisfies: -1.25 < D5bs / R8 < -0.8, where D5bs is the outer diameter of the object side surface of the fifth auxiliary spacer element in a direction perpendicular to the optical axis, and R8 is the radius of curvature of the image side surface of the fourth lens.

[0010] In one embodiment, the spacer element group further includes: a third spacer element and a fourth spacer element. The third spacer element is disposed between the third lens and the fourth lens and at least partially contacts the image side surface of the third lens. The fourth spacer element is disposed between the fourth lens and the fifth lens and at least partially contacts the image side surface of the fourth lens. The optical imaging lens satisfies: 29.85 < f34 / EP34 < 53.25, where f34 is the combined focal length of the third lens and the fourth lens, and EP34 is the axial spacing distance between the image side surface of the third spacer element and the object side surface of the fourth spacer element.

[0011] In one embodiment, the spacer element group further includes: a third spacer element and a fourth spacer element. The third spacer element is disposed between the third lens and the fourth lens and at least partially contacts the image side surface of the third lens. The fourth spacer element is disposed between the fourth lens and the fifth lens and at least partially contacts the image side surface of the fourth lens. The optical imaging lens satisfies: -1.92 < d4s / d3m × (f3 / f4) < -1.74, where d4s is the inner diameter of the object side surface of the fourth spacer element in a direction perpendicular to the optical axis, d3m is the inner diameter of the image side surface of the third spacer element in a direction perpendicular to the optical axis, f3 is the effective focal length of the third lens, and f4 is the effective focal length of the fourth lens.

[0012] In one embodiment, the spacer element group further includes: a fourth spacer element disposed between the fourth lens and the fifth lens and at least partially contacting the image side surface of the fourth lens. The optical imaging lens satisfies: 1.59 < D4m / f4 + D5m / f5 < 1.96, where D4m is the outer diameter of the image side surface of the fourth spacer element in a direction perpendicular to the optical axis, D5m is the outer diameter of the image side surface of the fifth spacer element in a direction perpendicular to the optical axis, f4 is the effective focal length of the fourth lens, and f5 is the effective focal length of the fifth lens.

[0013] In one embodiment, the optical imaging lens satisfies: -0.66 < D7m / R13 + d7m / R15 < 0.12, where D7m is the outer diameter of the image side surface of the seventh spacer element in a direction perpendicular to the optical axis, d7m is the inner diameter of the image side surface of the seventh spacer element in a direction perpendicular to the optical axis, R13 is the radius of curvature of the object side surface of the seventh lens, and R15 is the radius of curvature of the object side surface of the eighth lens.

[0014] In one embodiment, the optical imaging lens satisfies: 12.9 < d5s / CT5 + d6s / CT6 < 13.7, where d5s is the inner diameter of the object side surface of the fifth spacer element in a direction perpendicular to the optical axis, d6s is the inner diameter of the object side surface of the sixth spacer element in a direction perpendicular to the optical axis, CT5 is the central thickness of the fifth lens on the optical axis, and CT6 is the central thickness of the sixth lens on the optical axis.

[0015] In one embodiment, the optical imaging lens satisfies: 0.64 < TD / f8 + d0m / d7m < 1.02, where TD is the distance on the optical axis from the object side surface of the first lens to the image side surface of the eighth lens, f8 is the effective focal length of the eighth lens, d0m is the inner diameter of the image side end face of the lens barrel in the direction perpendicular to the optical axis, and d7m is the inner diameter of the image side surface of the seventh spacer element in the direction perpendicular to the optical axis.

[0016] In one embodiment, the optical imaging lens satisfies: 5.5 < EP56 / |SAG61| < 7.3, where EP56 is the axial distance between the image side surface of the fifth spacer element and the object side surface of the sixth spacer element along the optical axis, and SAG61 is the axial distance between the intersection of the object side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object side surface of the sixth lens.

[0017] In one embodiment, the spacer element group further includes: a fourth spacer element disposed between the fourth lens and the fifth lens and at least partially in contact with the image side surface of the fourth lens; the optical imaging lens satisfies: 0.9 < EP45 / |SAG51| < 1.25, where EP45 is the axial distance between the image side surface of the fourth spacer element and the object side surface of the fifth spacer element along the optical axis, and SAG51 is the axial distance between the intersection of the object side surface of the fifth lens and the optical axis and the vertex of the effective radius of the object side surface of the fifth lens.

[0018] The second aspect of the present application provides such an optical imaging lens, which includes: a lens barrel, and a lens group and a spacer element group disposed in the lens barrel. Among them, the lens group sequentially includes, from the object side to the image side along the optical axis: 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. Among them, the first lens, the fourth lens, and the fifth lens all have positive optical power, and the second lens, the third lens, the sixth lens, the seventh lens, and the eighth lens all have negative optical power; the spacer element group includes a seventh spacer element disposed between the seventh lens and the eighth lens and at least partially in contact with the image side surface of the seventh lens; the optical imaging lens satisfies: -0.66 < D7m / R13 + d7m / R15 < 0.12, where D7m is the outer diameter of the image side surface of the seventh spacer element in the direction perpendicular to the optical axis, d7m is the inner diameter of the image side surface of the seventh spacer element in the direction perpendicular to the optical axis, R13 is the curvature radius of the object side surface of the seventh lens, and R15 is the curvature radius of the object side surface of the eighth lens.

[0019] A third aspect of the present application provides an optical imaging lens, which includes a lens barrel, a lens group and a spacer element group disposed in the lens barrel. Among them, the lens group sequentially includes, from the object side to the image side along the optical axis: 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. Among them, the first lens, the fourth lens and the fifth lens all have positive optical powers, and the second lens, the third lens, the sixth lens, the seventh lens and the eighth lens all have negative optical powers; the spacer element group includes a seventh spacer element disposed between the seventh lens and the eighth lens and at least partially in contact with the image side surface of the seventh lens; the optical imaging lens satisfies: 0.64 < TD / f8 + d0m / d7m < 1.02, where TD is the distance on the optical axis from the object side surface of the first lens to the image side surface of the eighth lens, f8 is the effective focal length of the eighth lens, d0m is the inner diameter of the image side end surface of the lens barrel in the direction perpendicular to the optical axis, and d7m is the inner diameter of the image side surface of the seventh spacer element in the direction perpendicular to the optical axis.

[0020] The present application provides an eight-piece optical imaging lens with a reasonable combination of positive and negative optical powers, and satisfies 5.8 < f / EP56 + f / EP67 < 6.2 and -2.8 < f78 / EP67 < -2.0. On the one hand, by controlling the intervals between the fifth spacer element, the sixth spacer element and the seventh spacer element, the stability of the air gaps between the fifth lens, the sixth lens and the seventh lens is controlled, preventing performance problems such as field curvature caused by changes in air gaps under external conditions such as high humidity, high temperature, and dropping. On the other hand, when -2.8 < f78 / EP67 < -2.0 is satisfied, the problem that the sixth lens is prone to deformation during assembly due to the large radial step difference between the sixth lens and the seventh lens can be avoided, minimizing the difficulty and risk of bearing and assembling the sixth lens, the sixth spacer element, the seventh lens and the seventh spacer element, and effectively improving the assembly stability of the lens; restricting the combined focal length of the seventh lens and the eighth lens helps the connection between the front and rear lenses in the optical imaging lens, making the imaging quality higher and reducing imaging distortion. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, objects and advantages of the present application will become more obvious:

[0022] Figure 1 Shows a structural layout diagram and a schematic diagram of some parameters of an optical imaging lens according to the present application;

[0023] Figure 2A Shows a structural schematic diagram of the optical imaging lens according to Embodiment 1 of the present application;

[0024] Figure 2BShows a schematic structural diagram of an optical imaging lens according to Embodiment 2 of the present application;

[0025] Figure 2C Shows a schematic structural diagram of an optical imaging lens according to Embodiment 3 of the present application;

[0026] Figures 3A to 3D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens according to Embodiments 1 to 3 of the present application;

[0027] Figure 4A Shows a schematic structural diagram of an optical imaging lens according to Embodiment 4 of the present application;

[0028] Figure 4B Shows a schematic structural diagram of an optical imaging lens according to Embodiment 5 of the present application;

[0029] Figure 4C Shows a schematic structural diagram of an optical imaging lens according to Embodiment 6 of the present application;

[0030] Figures 5A to 5D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens according to Embodiments 4 to 6 of the present application;

[0031] Figure 6A Shows a schematic structural diagram of an optical imaging lens according to Embodiment 7 of the present application;

[0032] Figure 6B Shows a schematic structural diagram of an optical imaging lens according to Embodiment 8 of the present application;

[0033] Figure 6C Shows a schematic structural diagram of an optical imaging lens according to Embodiment 9 of the present application;

[0034] Figures 7A to 7D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens according to Embodiments 7 to 9 of the present application;

[0035] Figure 8A and Figure 8B Respectively show the strain schematic diagram and the partial enlarged view of the optical imaging lens when f78 / EP67 = -2.25;

[0036] Figure 8C and Figure 8D Respectively show the strain schematic diagram and the partial enlarged view of the optical imaging lens when f78 / EP67 = -4.2; and

[0037] Figure 8E and Figure 8FThe strain schematic diagram and the partial enlarged view of the optical imaging lens when f78 / EP67 = -1.66 are respectively shown. Detailed implementation manners

[0038] To better understand the present application, more detailed descriptions of various aspects of the present application will be made with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application and do not limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0039] It should be noted that in this specification, the expressions such as 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 teachings of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0040] In the accompanying drawings, for the sake of convenience of illustration, the thickness, size and shape of the lens have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are shown by way of example. That is, the spherical or aspherical shapes are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0041] In this article, the paraxial region refers to the region 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 region; 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 region. The surface of each lens close to the object to be photographed is called the object side surface of the lens, and the surface of each lens close to the imaging surface is called the image side surface of the lens.

[0042] It should also be understood that the terms "comprises", "comprising", "has", "including" and / or "including having", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when an expression such as "at least one of..." appears after the list of listed features, it modifies the entire list of listed features rather than individual elements in the list. In addition, when describing the embodiments of the present application, the use of "may" means "one or more embodiments of the present application". And the term "exemplary" is intended to refer to an example or illustration.

[0043] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as those commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0044] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The following embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. For example, the lens groups, lens barrels, and spacer elements in the embodiments of the present application can be combined arbitrarily, and are not limited to the lens groups in one embodiment being only combined with the lens barrels, spacer elements, etc. of the embodiment.

[0045] The present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments. Figure 1 The structure arrangement diagram of an optical imaging lens according to the present application and a schematic diagram of some parameters are shown. It should be understood by those skilled in the art that some parameters of lenses commonly used in the art (such as the center thickness CT1 of the first lens on the optical axis) are not shown in the figure. Figure 1 It is shown in Figure 1 Only some parameters of the lens barrel and the spacer element of an optical imaging lens of the present application are shown as examples to facilitate a better understanding of the present invention. Figure 1As shown, EP01 is the distance along the optical axis from the object-side end face of the lens barrel to the object-side surface of the first spacer element, EP34 is the distance along the optical axis between the image-side surface of the third spacer element and the object-side surface of the fourth spacer element, EP45 is the distance along the optical axis between the image-side surface of the fourth spacer element and the object-side surface of the fifth spacer element, EP56 is the distance along the optical axis between the image-side surface of the fifth spacer element and the object-side surface of the sixth spacer element, EP67 is the distance along the optical axis between the image-side surface of the sixth spacer element and the object-side surface of the seventh spacer element, D2s is the outer diameter of the object-side surface of the second spacer element in the direction perpendicular to the optical axis, d4s is the inner diameter of the object-side surface of the fourth spacer element in the direction perpendicular to the optical axis, d3m is the inner diameter of the image-side surface of the third spacer element in the direction perpendicular to the optical axis, d5s is the inner diameter of the object-side surface of the fifth spacer element in the direction perpendicular to the optical axis, D4m is the outer diameter of the image-side surface of the fourth spacer element in the direction perpendicular to the optical axis, d6s is the inner diameter of the object-side surface of the sixth spacer element in the direction perpendicular to the optical axis, d7m is the inner diameter of the image-side surface of the seventh spacer element in the direction perpendicular to the optical axis, D5bs is the outer diameter of the object-side surface of the fifth auxiliary spacer element in the direction perpendicular to the optical axis, D5m is the outer diameter of the image-side surface of the fifth spacer element in the direction perpendicular to the optical axis, D7m is the outer diameter of the image-side surface of the seventh spacer element in the direction perpendicular to the optical axis, and d0m is the inner diameter of the image-side end face of the lens barrel in the direction perpendicular to the optical axis.

[0046] The optical imaging lens according to an exemplary embodiment of the present application includes a lens barrel, and a lens group and a spacer element group disposed in the lens barrel. The lens group includes, in order from the object side to the image side along the optical axis: 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.

[0047] In the exemplary embodiment, the first lens, the fourth lens, and the fifth lens all have positive optical powers, and the second lens, the third lens, the sixth lens, the seventh lens, and the eighth lens all have negative optical powers.

[0048] In an exemplary embodiment, the spacer element group of the optical imaging lens may include at least one of a first spacer element, a second spacer element, a third spacer element, a fourth spacer element, a fifth spacer element, a sixth spacer element, and a seventh spacer element. The first spacer element is disposed between the first lens and the second lens and at least partially contacts the image side surface of the first lens. The second spacer element is disposed between the second lens and the third lens and at least partially contacts the image side surface of the second lens. The third spacer element is disposed between the third lens and the fourth lens and at least partially contacts the image side surface of the third lens. The fourth spacer element is disposed between the fourth lens and the fifth lens and at least partially contacts the image side surface of the fourth lens. The fifth spacer element is disposed between the fifth lens and the sixth lens and at least partially contacts the image side surface of the fifth lens. The sixth spacer element is disposed between the sixth lens and the seventh lens and at least partially contacts the image side surface of the sixth lens. The seventh spacer element is disposed between the seventh lens and the eighth lens and at least partially contacts the image side surface of the seventh lens.

[0049] It should be understood that the present application does not specifically limit the number of spacer elements. Any number of spacer elements may be included between any two lenses, and the entire optical imaging lens may also include any number of spacer elements. The spacer elements help the optical imaging lens intercept redundant refractive and reflective light paths, reducing the generation of stray light and ghost images. Adding auxiliary supports between the spacer elements and the lens barrel is beneficial to improving problems such as poor assembly stability and low performance yield caused by large step differences between lenses.

[0050] In an exemplary embodiment, the spacer element group may include a fifth spacer element, a sixth spacer element, and a seventh spacer element.

[0051] In an exemplary embodiment, the spacer element group may include a fifth spacer element and a fifth auxiliary spacer element. The fifth spacer element is disposed between the fifth lens and the sixth lens and at least partially contacts the image side surface of the fifth lens. The fifth auxiliary spacer element is disposed on the image side of the fifth spacer element and at least partially contacts the image side surface of the fifth spacer element.

[0052] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 5.8 < f / EP56 + f / EP67 < 6.2, where f is the effective focal length of the optical imaging lens, EP56 is the axial spacing distance between the image side surface of the fifth spacer element and the object side surface of the sixth spacer element, and EP67 is the axial spacing distance between the image side surface of the sixth spacer element and the object side surface of the seventh spacer element. By controlling the spacing between the fifth spacer element, the sixth spacer element, and the seventh spacer element, and thus controlling the air gaps between the fifth lens, the sixth lens, and the seventh lens, it is possible to prevent performance problems such as field curvature caused by changes in the air gaps under external conditions such as high humidity, high temperature, and dropping of the lens.

[0053] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: -2.8 < f78 / EP67 < -2.0, where f78 is the combined focal length of the seventh lens and the eighth lens, and EP67 is the distance between the image side of the sixth spacer element and the object side of the seventh spacer element along the optical axis direction. Controlling the distance between the sixth spacer element and the seventh spacer element is beneficial to controlling the edge thickness of the seventh lens, and is also beneficial to minimizing the difficulty and risk of abutting and assembling the sixth lens, the sixth spacer element, the seventh lens and the seventh spacer element, and can effectively improve the assembly stability; restricting the combined focal length of the seventh lens and the eighth lens helps the connection between the front and rear lenses in the optical imaging lens, making the imaging quality higher and reducing imaging distortion.

[0054] The optical imaging lens according to an exemplary embodiment of the present application includes: a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens group sequentially includes, from the object side to the image side along the optical axis: 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, where the first lens, the fourth lens, and the fifth lens all have positive optical power, and the second lens, the third lens, the sixth lens, the seventh lens, and the eighth lens all have negative optical power. The spacer element group may include a fifth spacer element, a sixth spacer element, and a seventh spacer element. The optical imaging lens satisfies: 5.8 < f / EP56 + f / EP67 < 6.2 and -2.8 < f78 / EP67 < -2.0, where f is the effective focal length of the optical imaging lens, EP56 is the distance between the image side of the fifth spacer element and the object side of the sixth spacer element along the optical axis direction, EP67 is the distance between the image side of the sixth spacer element and the object side of the seventh spacer element along the optical axis direction, and f78 is the combined focal length of the seventh lens and the eighth lens. By reasonably matching the positive and negative optical powers of the lenses in the optical imaging lens of the present application and satisfying: 5.8 < f / EP56 + f / EP67 < 6.2 and -2.8 < f78 / EP67 < -2.0, by controlling the distances between the fifth spacer element, the sixth spacer element, and the seventh spacer element, and further controlling the air gaps between the fifth lens, the sixth lens, and the seventh lens, it is possible to prevent performance problems such as field curvature caused by changes in the air gaps under external conditions such as high humidity, high temperature, and dropping. However, at the same time, due to the large step difference between the sixth lens and the seventh lens, the sixth lens is likely to be deformed during assembly, resulting in poor overall assembly stability of the lens. When -2.8 < f78 / EP67 < -2.0 is satisfied, it is beneficial to minimize the difficulty and risk of abutting and assembling the sixth lens, the sixth spacer element, the seventh lens, and the seventh spacer element, and can effectively improve the assembly stability; restricting the combined focal length of the seventh lens and the eighth lens helps the connection between the front and rear lenses in the optical imaging lens, making the imaging quality higher and reducing imaging distortion.

[0055] The following further illustrates the effect of the technical solution of the present application on improving the overall assembly stability of the lens. Figures 8A to 8F And Figure 8A Figure 8B respectively show the strain schematic diagram and the partial enlarged view of the optical imaging lens 1 when f78 / EP67 = -2.25. Figure 8C And Figure 8D Figure 8E respectively show the strain schematic diagram and the partial enlarged view of the optical imaging lens 2 when f78 / EP67 = -4.2. Figure 8F And

[0056] respectively show the strain schematic diagram and the partial enlarged view of the optical imaging lens 3 when f78 / EP67 = -1.66. In addition, the optical imaging lens 1, the optical imaging lens 2 and the optical imaging lens 3 all satisfy 5.8 < f / EP56 + f / EP67 < 6.2. Strain refers to the local relative deformation of an object under the action of external forces and non-uniform temperature fields and other factors. When each lens in the optical imaging lens is subjected to an external force after assembly, a certain deformation will occur, and the degree of deformation can be expressed by strain. According to the strain magnitude of each lens, the stress level it bears can be judged. The smaller the strain range of a lens, the higher the assembly stability of this lens. In addition, strain is the ratio of the amount of deformation to the original length dimension and is dimensionless.

[0057] Figure 8A Figure 8B And In, the minimum strain of the optical imaging lens 1 is 1.506e-8, and the maximum strain is 1.3541. Specifically, the strain of the non-effective diameter part of the image side of the sixth lens is 0.12216.

[0058] Figure 8C Figure 8D And In, the minimum strain of the optical imaging lens 2 is 0.0052196, and the maximum strain is 52.493. Specifically, the strain of the non-effective diameter part of the image side of the sixth lens is 9.2776, which is an increase of 9.15544 compared with the optical imaging lens 1. The strain of the non-effective diameter part of the image side of the seventh lens is 5.2948.

[0059] Figure 8E Figure 8F And In, the minimum strain of the optical imaging lens 3 is 5.5131e-5, and the maximum strain is 19.802. Specifically, the strain of the non-effective diameter part of the image side of the sixth lens is 6.8315, which is an increase of 6.70934 compared with the optical imaging lens 1.

[0060] ​Based on the above analysis, it can be seen that the optical imaging lens 1 meets the range of the conditional formula of this application: -2.8 < f78 / EP67 < -2.0. The intervals between the fifth spacer element, the sixth spacer element, and the seventh spacer element are reasonably designed. Furthermore, the air gaps between the fifth lens, the sixth lens, and the seventh lens are reasonably designed. Therefore, the overall strain range of the optical imaging lens 1 and the strain of the non-effective diameter part on the image side of the sixth lens are relatively small, and the overall assembly stability of the lens is high. However, both the optical imaging lens 2 and the optical imaging lens 3 do not meet the range of the conditional formula -2.8 < f78 / EP67 < -2.0. Their strain ranges and the strain of the non-effective diameter part on the image side of the sixth lens are much larger than those of the optical imaging lens 1. That is to say, whether EP67 is too large or too small will cause changes in the structure of the non-effective diameter part of the sixth lens or the seventh lens, resulting in poor connection between the effective diameter and the non-effective diameter. At the same time, it will cause changes in the position of the bearing surface of the sixth lens or the seventh lens. This will cause a large deformation in the structure of the sixth lens during assembly and cause it to be subjected to a large stress, which is not conducive to the assembly stability of the lens. Therefore, the eight-element optical imaging lens provided in this application meets 5.8 < f / EP56 + f / EP67 < 6.2 and -2.8 < f78 / EP67 < -2.0, has good assembly stability, and can prevent performance problems such as field curvature caused by air gap changes under external conditions such as high humidity, high temperature, and dropping, and better meet the requirements of industry applications.

[0061] In an exemplary embodiment, the optical imaging lens according to the present application can meet: 1.4 < D2s / R3 < 1.8, where D2s is the outer diameter of the object side of the second spacer element in the direction perpendicular to the optical axis, and R3 is the curvature radius of the object side of the second lens. Meeting 1.4 < D2s / R3 < 1.8 can effectively control the uniformity of the structure of the second lens, which is beneficial to the molding and processing of the second lens. At the same time, by controlling the outer diameter of the object side of the second spacer element, stray light at the edge of the second lens can be effectively intercepted, which is beneficial to ensuring that the optical imaging lens has a high imaging quality.

[0062] In an exemplary embodiment, the optical imaging lens according to the present application can meet: 0.3 < |SAG71| / EP67 < 0.45, where SAG71 is the axial distance between the intersection of the object side of the seventh lens and the optical axis and the vertex of the effective radius of the object side of the seventh lens, and EP67 is the interval distance between the image side of the sixth spacer element and the object side of the seventh spacer element in the direction along the optical axis. By controlling EP67, the thickness of the non-effective diameter region of the seventh lens can be restricted. Furthermore, meeting 0.3 < |SAG71| / EP67 < 0.45 can reasonably restrict the uniformity of the thickness ratio of the edge thickness to the middle thickness of the seventh lens, and can effectively control the size of the thinnest part of the seventh lens to ensure it is within a reasonable range, so as to reduce the molding and processing difficulty of the lens.

[0063] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 2.15 < EP01 / CT1 < 3.35, where EP01 is the distance along the optical axis from the object-side end face of the lens barrel to the object-side surface of the first spacer element, and CT1 is the central thickness of the first lens on the optical axis. By controlling the distance along the optical axis from the object-side end face of the lens barrel to the object-side surface of the first spacer element and the central thickness of the first lens, the thickness ratio of the first lens can be ensured to be within a reasonable range, ensuring that the central thickness and edge thickness ratio of the first lens are relatively stable under conditions such as dropping, high temperature, and high humidity, reducing the influence of external environmental stress on the imaging effect of the lens, and further improving the assembly stability of the lens.

[0064] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 13.7 < EP01 / |SAG12| < 22.7, where EP01 is the distance along the optical axis from the object-side end face of the lens barrel to the object-side surface of the first spacer element, and SAG12 is the axial distance from the intersection of the image-side surface of the first lens and the optical axis to the vertex of the effective radius of the image-side surface of the first lens. Satisfying 13.7 < EP01 / |SAG12| < 22.7, by controlling the distance along the optical axis from the object-side end face of the lens barrel to the object-side surface of the first spacer element, the head size of the optical imaging lens can be effectively controlled, the edge thickness of the first lens can be restricted, and at the same time, by controlling SAG12, the surface shape of the image-side surface of the first lens can be effectively controlled, thereby controlling the thickness of the first lens, ensuring that the first lens has reasonable strength and thickness ratio, and further improving the reliability of the lens.

[0065] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: -1.25 < D5bs / R8 < -0.8, where D5bs is the outer diameter of the object-side surface of the fifth auxiliary spacer element in the direction perpendicular to the optical axis, and R8 is the curvature radius of the image-side surface of the fourth lens. Satisfying -1.25 < D5bs / R8 < -0.8 can effectively control the shape and structure of the fourth lens, reduce the forming and processing difficulty of the fourth lens, and by controlling the outer diameter of the object-side surface of the fifth auxiliary spacer element in the direction perpendicular to the optical axis, the bearing area between the fifth auxiliary spacer element and the lens barrel can be kept within a reasonable range, which is beneficial to ensuring the assembly stability of the optical imaging lens.

[0066] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 29.85 < f34 / EP34 < 53.25, where f34 is the combined focal length of the third lens and the fourth lens, and EP34 is the distance between the image side of the third spacer element and the object side of the fourth spacer element along the optical axis direction. Satisfying 29.85 < f34 / EP34 < 53.25 is beneficial to the layout design of the lens flange mechanism, minimizing the difficulty and risk of lens bearing and assembly. Constraining the combined focal length of the third lens and the fourth lens helps the connection between the front and rear lenses in the optical imaging lens, resulting in higher imaging quality and reduced imaging distortion.

[0067] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: -1.92 < d4s / d3m × (f3 / f4) < -1.74, where d4s is the inner diameter of the object side of the fourth spacer element in the direction perpendicular to the optical axis, d3m is the inner diameter of the image side of the third spacer element in the direction perpendicular to the optical axis, f3 is the effective focal length of the third lens, and f4 is the effective focal length of the fourth lens. Satisfying -1.92 < d4s / d3m × (f3 / f4) < -1.74 can effectively intercept non-effective light passing through the third lens and the fourth lens by controlling the inner diameters of the third spacer element and the fourth spacer element, which is beneficial to the processing and assembly of the spacer elements. Controlling the effective focal lengths of the third lens and the fourth lens helps the connection between the front and rear lenses in the optical imaging lens, reduces imaging distortion, and results in higher imaging quality.

[0068] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 1.59 < D4m / f4 + D5m / f5 < 1.96, where D4m is the outer diameter of the image side of the fourth spacer element in the direction perpendicular to the optical axis, D5m is the outer diameter of the image side of the fifth spacer element in the direction perpendicular to the optical axis, f4 is the effective focal length of the fourth lens, and f5 is the effective focal length of the fifth lens. Satisfying 1.59 < D4m / f4 + D5m / f5 < 1.96 by controlling the outer diameters of the fourth spacer element and the fifth spacer element is beneficial to the reasonable layout of the lens structure, ensuring the uniformity of the wall thickness transition of the lens barrel and reducing the forming difficulty of the lens barrel. Controlling the effective focal lengths of the fourth lens and the fifth lens helps the smooth connection of light between the fourth lens and the fifth lens, improves imaging quality, and reduces imaging distortion.

[0069] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: -0.66 < D7m / R13 + d7m / R15 < 0.12, where D7m is the outer diameter of the image side surface of the seventh spacer element in the direction perpendicular to the optical axis, d7m is the inner diameter of the image side surface of the seventh spacer element in the direction perpendicular to the optical axis, R13 is the curvature radius of the object side surface of the seventh lens, and R15 is the curvature radius of the object side surface of the eighth lens. Satisfying -0.66 < D7m / R13 + d7m / R15 < 0.12 is beneficial to the processing of the seventh spacer element. At the same time, reasonably restricting the inner diameter of the seventh spacer element can effectively intercept non-effective light rays passing through the lens, control the curvature radii of the seventh lens and the eighth lens, and is beneficial to reducing the risk of interference between adjacent lenses and between the lens and the spacer element.

[0070] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 12.9 < d5s / CT5 + d6s / CT6 < 13.7, where d5s is the inner diameter of the object side surface of the fifth spacer element in the direction perpendicular to the optical axis, d6s is the inner diameter of the object side surface of the sixth spacer element in the direction perpendicular to the optical axis, CT5 is the central thickness of the fifth lens on the optical axis, and CT6 is the central thickness of the sixth lens on the optical axis. Satisfying 12.9 < d5s / CT5 + d6s / CT6 < 13.7 is beneficial to restricting the central thicknesses of the fifth lens and the sixth lens, reducing the risk of interference between the effective diameter region of the lens and the inner diameter of the spacer element, causing abnormal relative illuminance of the image plane, and ensuring a reasonable air gap between the fifth lens and the sixth lens, improving the imaging quality of the lens; at the same time, restricting the inner diameters of the fifth spacer element and the sixth spacer element can effectively intercept non-effective light rays passing through the lens, which is beneficial to the assembly and processing of the spacer element.

[0071] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 0.64 < TD / f8 + d0m / d7m < 1.02, where TD is the distance on the optical axis from the object side surface of the first lens to the image side surface of the eighth lens, f8 is the effective focal length of the eighth lens, d0m is the inner diameter of the image side end surface of the lens barrel in the direction perpendicular to the optical axis, and d7m is the inner diameter of the image side surface of the seventh spacer element in the direction perpendicular to the optical axis. Satisfying 0.64 < TD / f8 + d0m / d7m < 1.02, by reasonably controlling the distance on the optical axis from the object side surface of the first lens to the image side surface of the eighth lens, is beneficial to ensuring the thinness and lightness of the lens. Further, by controlling the effective focal length of the eighth lens, the inner diameter of the lens barrel, and the inner diameter of the seventh spacer element, it is beneficial to ensure the imaging quality of the lens while ensuring the light transmission amount, reducing the processing difficulty of the lens barrel and the spacer element, and facilitating assembly.

[0072] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 5.5 < EP56 / |SAG61| < 7.3, where EP56 is the axial distance between the image side surface of the fifth spacer element and the object side surface of the sixth spacer element along the optical axis, and SAG61 is the axial distance between the intersection point of the object side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object side surface of the sixth lens. By controlling EP56, the edge thickness of the sixth lens can be controlled, and by controlling SAG61, the central thickness of the sixth lens along the optical axis can be controlled. Therefore, satisfying 5.5 < EP56 / |SAG61| < 7.3 can effectively control the thickness ratio of the sixth lens, which is beneficial to the forming and processing of the sixth lens.

[0073] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 0.9 < EP45 / |SAG51| < 1.25, where EP45 is the axial distance between the image side surface of the fourth spacer element and the object side surface of the fifth spacer element along the optical axis, and SAG51 is the axial distance between the intersection point of the object side surface of the fifth lens and the optical axis and the vertex of the effective radius of the object side surface of the fifth lens. By controlling EP45, the edge thickness of the fifth lens can be controlled, and by controlling SAG51, the central thickness of the fifth lens along the optical axis can be controlled. Therefore, satisfying 0.9 < EP45 / |SAG51| < 1.25 can reasonably control the thickness ratio of the middle thickness to the edge thickness of the fifth lens to reduce the difficulty of the lens forming process, and can also control the uniformity of the thickness of the structural area of the fifth lens to ensure the processability of the structural area of the fifth lens.

[0074] An optical imaging lens according to an exemplary embodiment of the present application includes: a lens barrel, and a lens group and a spacer element group disposed within the lens barrel. The lens group sequentially includes, from the object side to the image side along the optical axis: 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, wherein the first lens, the fourth lens, and the fifth lens all have positive optical powers, and the second lens, the third lens, the sixth lens, the seventh lens, and the eighth lens all have negative optical powers. The spacer element group may include a seventh spacer element disposed between the seventh lens and the eighth lens and at least partially in contact with the image side surface of the seventh lens. The optical imaging lens satisfies: -0.66 < D7m / R13 + d7m / R15 < 0.12, where D7m is the outer diameter of the image side surface of the seventh spacer element in a direction perpendicular to the optical axis, d7m is the inner diameter of the image side surface of the seventh spacer element in a direction perpendicular to the optical axis, R13 is the radius of curvature of the object side surface of the seventh lens, and R15 is the radius of curvature of the object side surface of the eighth lens. By controlling the inner diameter and the outer diameter of the seventh spacer element in the present application, it is beneficial to the processing of the seventh spacer element. At the same time, by reasonably restricting the inner diameter of the seventh spacer element, non-effective light rays passing through the lens can be effectively intercepted. By controlling the radius of curvature of the seventh lens and the eighth lens, the risk of interference between adjacent lenses and between the lens and the spacer element can be reduced.

[0075] An optical imaging lens according to an exemplary embodiment of the present application includes: a lens barrel, and a lens group and a spacer element group disposed within the lens barrel. The lens group sequentially includes, from the object side to the image side along the optical axis: 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, wherein the first lens, the fourth lens, and the fifth lens all have positive optical powers, and the second lens, the third lens, the sixth lens, the seventh lens, and the eighth lens all have negative optical powers. The spacer element group may include a seventh spacer element disposed between the seventh lens and the eighth lens and at least partially in contact with the image side surface of the seventh lens. The optical imaging lens satisfies: 0.64 < TD / f8 + d0m / d7m < 1.02, where TD is the distance on the optical axis from the object side surface of the first lens to the image side surface of the eighth lens, f8 is the effective focal length of the eighth lens, d0m is the inner diameter of the image side end surface of the lens barrel in a direction perpendicular to the optical axis, and d7m is the inner diameter of the image side surface of the seventh spacer element in a direction perpendicular to the optical axis. By reasonably controlling the distance on the optical axis from the object side surface of the first lens to the image side surface of the eighth lens in the present application, it is beneficial to ensure the thinness and lightness of the lens. Further, by controlling the effective focal length of the eighth lens, the inner diameter of the lens barrel, and the inner diameter of the seventh spacer element, it is beneficial to ensure the imaging quality of the lens while ensuring the light transmission amount, and reducing the processing difficulty of the lens barrel and the spacer element, so as to facilitate assembly.

[0076] In an embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the object side surface of the first lens to the image side surface of the eighth lens is an aspherical mirror surface. The characteristic of an aspherical lens is that the curvature continuously changes from the center of the lens to the periphery of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and astigmatism aberration. After using an aspherical lens, it is possible to eliminate the aberration that appears during imaging as much as possible, thereby improving the imaging quality. Optionally, the object side surface and the image side surface of all the lenses from the first lens to the eighth lens are aspherical mirror surfaces.

[0077] In an exemplary embodiment, the above optical imaging lens may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0078] The optical imaging lens according to the above embodiment of the present application may employ multiple lenses, such as the eight lenses mentioned above. By reasonably distributing the optical power, surface type of each lens, and the arrangement of each spacer element, etc., the span of each gear when the lens cooperates with the lens barrel is relatively uniform, enhancing the light converging ability and improving the imaging quality of the optical imaging lens. 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 embodiment, the optical imaging lens is not limited to including eight lenses. If necessary, the optical imaging lens may further include other numbers of lenses.

[0079] The following further describes specific embodiments of the optical imaging lens applicable to the above embodiments with reference to the accompanying drawings. Specifically, refer to Figures 2A to 3D Describe the optical imaging lens 1001 of Embodiment 1, the optical imaging lens 1002 of Embodiment 2, and the optical imaging lens 1003 of Embodiment 3 according to the present application; refer to Figures 4A to 5D Describe the optical imaging lens 2001 of Embodiment 4, the optical imaging lens 2002 of Embodiment 5, and the optical imaging lens 2003 of Embodiment 6 according to the present application; refer to Figures 6A to 7D Describe the optical imaging lens 3001 of Embodiment 7, the optical imaging lens 3002 of Embodiment 8, and the optical imaging lens 3003 of Embodiment 9 according to the present application.

[0080] Example 1

[0081] Figure 2A The structural schematic diagram of the optical imaging lens 1001 according to Embodiment 1 of the present application is shown.

[0082] AsFigure 2A As shown, the optical imaging lens 1001 includes a lens barrel P0, a lens group, and a spacer element group. The lens group includes, in order from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8. The first lens E1 has an object side surface S1 and an image side surface S2, the second lens E2 has an object side surface S3 and an image side surface S4, the third lens E3 has an object side surface S5 and an image side surface S6, the fourth lens E4 has an object side surface S7 and an image side surface S8, the fifth lens E5 has an object side surface S9 and an image side surface S10, the sixth lens E6 has an object side surface S11 and an image side surface S12, the seventh lens E7 has an object side surface S13 and an image side surface S14, and the eighth lens E8 has an object side surface S15 and an image side surface S16.

[0083] The optical imaging lens 1001 further includes a filter (not shown) for correcting color deviation, and the filter has an object side surface S17 and an image side surface S18. The optical imaging lens 1001 further includes a diaphragm STO (not shown) disposed on the object side of the first lens. Light from an object sequentially passes through the surfaces S1 to S18 and finally forms an image on an imaging surface S19 (not shown).

[0084] Table 1 shows the basic parameter table of the lens group of the optical imaging lens 1001 in Embodiment 1, where the units of the radius of curvature, thickness / distance, and effective focal length are all millimeters (mm).

[0085]

[0086]

[0087] Table 1

[0088] In Embodiment 1, the object side surface and the image side surface of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces, and the surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0089]

[0090] where x is the sagitta, the distance from the vertex of the aspherical surface at a position with a height of h along the optical axis direction; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 gives the higher-order term coefficients A4, A6, A8, A 10 , A 12 , A 14 , A 16 , A 18 , and A20 。

[0091] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 3.9551E-02 -2.4613E-02 4.1142E-02 -4.0187E-02 7.8725E-04 2.4888E-02 -4.9336E-03 -1.6658E-02 -6.1908E-03 S2 -1.0347E-01 3.4257E-02 1.0034E-02 1.8532E-03 -1.2931E-02 -5.3600E-03 -2.8399E-03 -8.5383E-04 -6.4510E-04 S3 -2.9955E-01 1.2404E-02 -5.9228E-03 4.1169E-03 1.8986E-04 7.7196E-04 3.1482E-05 -3.8643E-05 -9.4165E-05 S4 -3.5412E-01 -9.4321E-03 -8.3681E-03 7.5406E-04 -5.6029E-04 3.2727E-04 1.0404E-04 -2.2909E-05 -3.7991E-05 S5 -1.9029E-01 -1.6357E-02 1.5565E-03 -1.2698E-04 -2.3162E-03 -1.7448E-03 -7.3457E-04 -3.2985E-04 -1.5282E-04 S6 -2.6626E-01 -5.4764E-03 1.2599E-02 -2.2667E-03 1.6166E-03 -3.2220E-03 5.3396E-04 -1.7288E-04 1.0211E-04 S7 -1.6790E-01 1.2327E-01 -4.8635E-02 -3.6257E-02 7.9241E-03 -4.0283E-03 -4.1226E-03 -7.0825E-03 -7.9612E-04 S8 1.5970E-02 1.6940E-01 -8.5874E-02 -2.5984E-03 3.9836E-02 3.2441E-03 -1.3872E-02 -7.3273E-03 -1.9351E-03 S9 3.5433E-01 5.4738E-02 2.5050E-02 1.6099E-02 4.2658E-03 3.1131E-03 2.5116E-04 1.2036E-04 -2.3475E-04 S10 2.9267E-01 -4.6187E-02 2.0142E-02 1.0523E-02 5.6690E-03 2.7850E-03 1.5378E-03 4.7389E-04 4.1851E-04 S11 -9.1641E+00 2.2218E+00 -1.4477E+00 1.9151E-01 -1.3050E-01 5.8844E-02 2.2442E-01 -7.3245E-02 5.3280E-02 S12 -3.2481E+00 7.5813E-01 -2.1920E-01 1.0926E-02 2.2151E-01 1.1640E-02 3.5248E-03 -1.3686E-02 1.6653E-03 S13 -1.5465E-01 -2.6100E-01 2.6744E-01 -1.5019E-01 -1.9230E-02 -1.8615E-02 -4.5672E-03 -5.4125E-03 3.4056E-04 S14 1.2525E+01 -1.5313E+00 -2.2884E+00 3.3465E-01 9.4479E-01 -5.0676E-01 -5.0362E-02 3.2277E-01 2.1559E-01 S15 -3.7625E+00 4.6184E+00 1.1557E+00 1.6165E+00 -5.1812E-01 -6.2739E-01 -4.0444E-02 5.5163E-01 -1.4496E-01 S16 -6.9458E+00 1.0931E+00 -6.3380E-01 1.0724E-01 -2.0595E-01 -2.1292E-03 -5.4023E-02 -1.0496E-02 -2.1400E-02

[0092] Table 2

[0093] Table 3 shows the effective focal length f of the optical imaging lens 1001 of Embodiment 1 and the sagittal heights of some lenses. The units of all parameters in Table 3 are millimeters (mm).

[0094] Parameter f SAG12 SAG51 SAG61 SAG71 Value 5.44 0.04 -0.48 -0.27 -0.77

[0095] Table 3

[0096] As Figure 2A shown, the optical imaging lens 1001 further includes eight spacer elements, namely a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, a fifth auxiliary spacer element P5b, a sixth spacer element P6, and a seventh spacer element P7. The first spacer element P1 is disposed on the image side of the first lens and at least partially contacts the image side surface of the first lens; the second spacer element P2 is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens; the third spacer element P3 is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens; the fourth spacer element P4 is disposed on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens; the fifth spacer element P5 is disposed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; the fifth auxiliary spacer element P5b is disposed on the image side of the fifth spacer element and at least partially contacts the image side surface of the fifth spacer element; the sixth spacer element P6 is disposed on the image side of the sixth lens and at least partially contacts the image side surface of the sixth lens; the seventh spacer element P7 is disposed on the image side of the seventh lens and at least partially contacts the image side surface of the seventh lens.

[0097] Table 4 shows the basic parameter table of the spacer elements of the optical imaging lens 1001. The units of all parameters in Table 4 are millimeters (mm). The above spacer elements can block external redundant light from entering, enable the lens and the lens barrel to be better supported, and enhance the structural stability of the optical imaging lens 1001.

[0098] Parameter D2s d3m d4s D4m d5s D5m D5bs d6s Value 4.32 3.79 4.08 4.56 4.51 7.47 6.75 6.30 Parameter d7m D7m d0m EP01 EP34 EP45 EP56 EP67 Value 7.90 10.45 11.81 0.55 0.34 0.44 2.00 1.74

[0099] Table 4

[0100] Example 2

[0101] Figure 2B shows a schematic structural diagram of an optical imaging lens 1002 according to Embodiment 2 of the present application. In this embodiment and the following embodiments, for the sake of simplicity, some descriptions similar to those in Embodiment 1 will be omitted.

[0102] As Figure 2B shown, the optical imaging lens 1002 includes a lens barrel P0, a lens group, and a spacer element group. The lens group of the optical imaging lens 1002 is exactly the same as that of the optical imaging lens 1001 in Embodiment 1, and will not be described in detail. The optical imaging lens 1002 further includes a filter (not shown) for correcting color deviation, and the filter has an object side S17 and an image side S18. The optical imaging lens 1002 further includes a diaphragm STO (not shown) disposed on the object side of the first lens. Light from an object sequentially passes through each surface S1 to S18 and finally forms an image on an imaging surface S19 (not shown). The basic parameters of the optical imaging lens 1002 are shown in Tables 1 to 3 and will not be described in detail.

[0103] As Figure 2B shown, the optical imaging lens 1002 further includes eight spacer elements, namely a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, a fifth auxiliary spacer element P5b, a sixth spacer element P6, and a seventh spacer element P7. The first spacer element P1 is disposed on the image side of the first lens and at least partially contacts the image side surface of the first lens; the second spacer element P2 is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens; the third spacer element P3 is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens; the fourth spacer element P4 is disposed on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens; the fifth spacer element P5 is disposed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; the fifth auxiliary spacer element P5b is disposed on the image side of the fifth spacer element and at least partially contacts the image side surface of the fifth spacer element; the sixth spacer element P6 is disposed on the image side of the sixth lens and at least partially contacts the image side surface of the sixth lens; the seventh spacer element P7 is disposed on the image side of the seventh lens and at least partially contacts the image side surface of the seventh lens.

[0104] Table 5 shows the basic parameter table of the spacer elements of the optical imaging lens 1002. The unit of each parameter in Table 5 is millimeter (mm). The above spacer elements can block external redundant light from entering, enable the lens and the lens barrel to better bear against each other, and enhance the structural stability of the optical imaging lens 1002.

[0105] Parameter D2s d3m d4s D4m d5s D5m D5bs d6s Value 4.36 3.87 4.16 4.79 4.69 8.33 7.85 6.30 Parameter d7m D7m d0m EP01 EP34 EP45 EP56 EP67 Value 7.92 9.56 12.61 0.76 0.37 0.55 1.69 1.89

[0106] Table 5

[0107] Example 3

[0108] Figure 2C shows a schematic structural diagram of an optical imaging lens 1003 according to Embodiment 3 of the present application.

[0109] AsFigure 2C As shown, the optical imaging lens 1003 includes a lens barrel P0, a lens group, and a spacer element group. The lens group of the optical imaging lens 1003 is exactly the same as that of the optical imaging lens 1001 in Embodiment 1 and will not be elaborated here. The optical imaging lens 1003 further includes a filter (not shown) for correcting color deviation, and the filter has an object side S17 and an image side S18. The optical imaging lens 1003 further includes a diaphragm STO (not shown) disposed on the object side of the first lens. Light from the object sequentially passes through each surface S1 to S18 and finally forms an image on an imaging surface S19 (not shown). The basic parameters of the optical imaging lens 1003 are shown in Tables 1 to 3 and will not be elaborated here.

[0110] As Figure 2C As shown, the optical imaging lens 1003 further includes eight spacer elements, namely a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, a fifth auxiliary spacer element P5b, a sixth spacer element P6, and a seventh spacer element P7. The first spacer element P1 is disposed on the image side of the first lens and is at least partially in contact with the image side surface of the first lens; the second spacer element P2 is disposed on the image side of the second lens and is at least partially in contact with the image side surface of the second lens; the third spacer element P3 is disposed on the image side of the third lens and is at least partially in contact with the image side surface of the third lens; the fourth spacer element P4 is disposed on the image side of the fourth lens and is at least partially in contact with the image side surface of the fourth lens; the fifth spacer element P5 is disposed on the image side of the fifth lens and is at least partially in contact with the image side surface of the fifth lens; the fifth auxiliary spacer element P5b is disposed on the image side of the fifth spacer element and is at least partially in contact with the image side surface of the fifth spacer element; the sixth spacer element P6 is disposed on the image side of the sixth lens and is at least partially in contact with the image side surface of the sixth lens; the seventh spacer element P7 is disposed on the image side of the seventh lens and is at least partially in contact with the image side surface of the seventh lens.

[0111] Table 6 shows the basic parameter table of the spacer elements of the optical imaging lens 1003, and the unit of each parameter in Table 6 is millimeter (mm). The above spacer elements can block external redundant light from entering, enable the lens and the lens barrel to be better supported, and enhance the structural stability of the optical imaging lens 1003.

[0112] Parameter D2s d3m d4s D4m d5s D5m D5bs d6s Value 4.27 3.80 4.10 4.96 4.62 6.18 5.75 6.22 Parameter d7m D7m d0m EP01 EP34 EP45 EP56 EP67 Value 7.89 10.65 11.65 0.70 0.34 0.55 1.76 1.89

[0113] Table 6

[0114] Figure 3A shows the axial chromatic aberration curves of the optical imaging lens 1001 in Embodiment 1, the optical imaging lens 1002 in Embodiment 2, and the optical imaging lens 1003 in Embodiment 3, which represent the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 3BThe astigmatism curves of the optical imaging lens 1001 of Embodiment 1, the optical imaging lens 1002 of Embodiment 2, and the optical imaging lens 1003 of Embodiment 3 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 3C The distortion curves of the optical imaging lens 1001 of Embodiment 1, the optical imaging lens 1002 of Embodiment 2, and the optical imaging lens 1003 of Embodiment 3 are shown, which represent the distortion magnitude values corresponding to different image heights. Figure 3D The longitudinal chromatic aberration curves of the optical imaging lens 1001 of Embodiment 1, the optical imaging lens 1002 of Embodiment 2, and the optical imaging lens 1003 of Embodiment 3 are shown, which represent the deviations of different image heights on the imaging plane after light passes through the lens.

[0115] According to Figures 3A to 3D It can be known that the optical imaging lens 1001 of Embodiment 1, the optical imaging lens 1002 of Embodiment 2, and the optical imaging lens 1003 of Embodiment 3 can all achieve good imaging quality.

[0116] Example 4

[0117] Figure 4A The structural schematic diagram of the optical imaging lens 2001 according to Embodiment 4 of the present application is shown.

[0118] As Figure 4A shown, the optical imaging lens 2001 includes a lens barrel P0, a lens group, and a spacer element group. The lens group includes, in order from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8. The first lens E1 has an object side surface S1 and an image side surface S2, the second lens E2 has an object side surface S3 and an image side surface S4, the third lens E3 has an object side surface S5 and an image side surface S6, the fourth lens E4 has an object side surface S7 and an image side surface S8, the fifth lens E5 has an object side surface S9 and an image side surface S10, the sixth lens E6 has an object side surface S11 and an image side surface S12, the seventh lens E7 has an object side surface S13 and an image side surface S14, and the eighth lens E8 has an object side surface S15 and an image side surface S16.

[0119] The optical imaging lens 2001 further includes a filter (not shown) for correcting color deviation, and the filter has an object side surface S17 and an image side surface S18. The optical imaging lens 2001 further includes a diaphragm STO (not shown) disposed on the object side of the first lens. Light from an object sequentially passes through the surfaces S1 to S18 and finally forms an image on the imaging surface S19 (not shown).

[0120] Table 7 shows the basic parameter table of the lens group of the optical imaging lens 2001 in Embodiment 4. Among them, the units of the radius of curvature, thickness / distance, and effective focal length are all millimeters (mm).

[0121]

[0122] Table 7

[0123] Table 8 shows the high-order term coefficients of the aspherical mirror surfaces that can be used in Embodiment 4. Among them, each aspherical surface type can be defined by the formula (1) given in the above Embodiment 1.

[0124] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 3.6386E-02 -2.4043E-02 4.1108E-02 -4.0412E-02 1.0284E-03 2.4789E-02 -4.8463E-03 -1.6731E-02 -5.9722E-03 S2 -1.0425E-01 3.4899E-02 9.7534E-03 1.6244E-03 -1.2722E-02 -5.3440E-03 -2.8310E-03 -1.0627E-03 -6.5081E-04 S3 -2.9987E-01 1.1693E-02 -6.4010E-03 3.7887E-03 -7.9300E-05 3.9777E-04 5.4251E-06 1.0142E-05 -2.9098E-05 S4 -3.5476E-01 -8.9183E-03 -8.2880E-03 7.8761E-04 -6.7665E-04 2.9295E-04 2.9576E-04 1.1270E-04 3.0136E-05 S5 -1.9129E-01 -1.6343E-02 2.2493E-03 -4.1974E-04 -2.1834E-03 -1.6009E-03 -2.8634E-04 -1.2822E-04 1.0969E-05 S6 -2.6586E-01 -5.7206E-03 1.2229E-02 -2.4052E-03 1.4086E-03 -3.1017E-03 6.3542E-04 -1.4670E-04 1.1597E-04 S7 -1.6784E-01 1.2301E-01 -4.7909E-02 -3.6420E-02 7.5029E-03 -4.1387E-03 -3.9098E-03 -6.7554E-03 -7.6335E-04 S8 1.1314E-02 1.7329E-01 -8.6317E-02 -2.1831E-03 3.9802E-02 3.2240E-03 -1.3942E-02 -7.3222E-03 -2.1225E-03 S9 3.5937E-01 5.3897E-02 2.4869E-02 1.5504E-02 4.0134E-03 2.7860E-03 1.3021E-04 2.9008E-04 -3.1310E-05 S10 2.9193E-01 -4.5471E-02 2.0383E-02 1.0941E-02 5.7622E-03 3.2236E-03 1.4033E-03 4.5820E-04 2.3470E-04 S11 -9.8867E+00 2.3807E+00 -1.5040E+00 2.1425E-01 -1.3775E-01 5.9234E-02 2.2626E-01 -7.5382E-02 5.5086E-02 S12 -3.3977E+00 8.2838E-01 -2.4988E-01 2.0540E-02 2.1977E-01 9.9259E-03 5.1169E-03 -1.3646E-02 -2.0624E-04 S13 -1.3019E-01 -2.5861E-01 2.3631E-01 -1.5074E-01 -1.6235E-02 -1.8440E-02 -4.9418E-03 -4.6989E-03 8.3742E-04 S14 1.3141E+01 -1.6537E+00 -2.2546E+00 3.3687E-01 9.4059E-01 -5.0057E-01 -5.3134E-02 3.2219E-01 2.1988E-01 S15 -3.7621E+00 4.6491E+00 1.0641E+00 1.7017E+00 -5.7579E-01 -6.0007E-01 -5.4797E-02 5.5258E-01 -1.4433E-01 S16 -6.9490E+00 1.0065E+00 -6.4341E-01 7.0474E-02 -1.8956E-01 -4.6447E-03 -4.3516E-02 -8.6117E-03 -6.9135E-03

[0125] Table 8

[0126] Table 9 shows the effective focal length f of the optical imaging lens 2001 in Embodiment 4 and the sag heights of some lenses. The units of the parameters in Table 9 are all millimeters (mm).

[0127] Parameter f SAG12 SAG51 SAG61 SAG71 Value 5.41 0.03 -0.48 -0.28 -0.67

[0128] Table 9

[0129] As Figure 4A shown, the optical imaging lens 2001 further includes 8 spacer elements, namely the first spacer element P1, the second spacer element P2, the third spacer element P3, the fourth spacer element P4, the fifth spacer element P5, the fifth auxiliary spacer element P5b, the sixth spacer element P6, and the seventh spacer element P7. The first spacer element P1 is placed on the image side of the first lens and is at least partially in contact with the image side surface of the first lens; the second spacer element P2 is placed on the image side of the second lens and is at least partially in contact with the image side surface of the second lens; the third spacer element P3 is placed on the image side of the third lens and is at least partially in contact with the image side surface of the third lens; the fourth spacer element P4 is placed on the image side of the fourth lens and is at least partially in contact with the image side surface of the fourth lens; the fifth spacer element P5 is placed on the image side of the fifth lens and is at least partially in contact with the image side surface of the fifth lens; the fifth auxiliary spacer element P5b is placed on the image side of the fifth spacer element and is at least partially in contact with the image side surface of the fifth spacer element; the sixth spacer element P6 is placed on the image side of the sixth lens and is at least partially in contact with the image side surface of the sixth lens; the seventh spacer element P7 is placed on the image side of the seventh lens and is at least partially in contact with the image side surface of the seventh lens.

[0130] Table 10 shows the basic parameter table of the spacer elements of the optical imaging lens 2001. The units of the parameters in Table 10 are all millimeters (mm). The above spacer elements can block the entry of excess external light, enable the lens to better rest against the lens barrel, and enhance the structural stability of the optical imaging lens 2001.

[0131] Parameter D2s d3m d4s D4m d5s D5m D5bs d6s Value 3.88 3.76 4.07 5.33 4.53 5.61 5.31 6.03 Parameter d7m D7m d0m EP01 EP34 EP45 EP56 EP67 Value 7.53 10.32 10.60 0.66 0.36 0.51 1.82 1.87

[0132] Table 10

[0133] Example 5

[0134] Figure 4B shows a schematic structural diagram of the optical imaging lens 2002 according to Embodiment 5 of the present application.

[0135] As Figure 4B shown, the optical imaging lens 2002 includes a lens barrel P0, a lens group, and a spacer element group. The lens group of the optical imaging lens 2002 is exactly the same as that of the optical imaging lens 2001 in Embodiment 4 and will not be described in detail. The optical imaging lens 2002 further includes a filter (not shown) for correcting color deviation, and the filter has an object side S17 and an image side S18. The optical imaging lens 2002 further includes a diaphragm STO (not shown) disposed on the object side of the first lens. Light from an object sequentially passes through the surfaces S1 to S18 and finally forms an image on an imaging surface S19 (not shown). The basic parameters of the optical imaging lens 2002 are shown in detail in Tables 7 to 9 and will not be described in detail.

[0136] As Figure 4B shown, the optical imaging lens 2002 further includes 8 spacer elements, namely a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, a fifth auxiliary spacer element P5b, a sixth spacer element P6, and a seventh spacer element P7. The first spacer element P1 is disposed on the image side of the first lens and at least partially contacts the image side surface of the first lens; the second spacer element P2 is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens; the third spacer element P3 is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens; the fourth spacer element P4 is disposed on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens; the fifth spacer element P5 is disposed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; the fifth auxiliary spacer element P5b is disposed on the image side of the fifth spacer element and at least partially contacts the image side surface of the fifth spacer element; the sixth spacer element P6 is disposed on the image side of the sixth lens and at least partially contacts the image side surface of the sixth lens; the seventh spacer element P7 is disposed on the image side of the seventh lens and at least partially contacts the image side surface of the seventh lens.

[0137] Table 11 shows the basic parameter table of the spacer elements of the optical imaging lens 2002, and the unit of each parameter in Table 11 is millimeter (mm). The above spacer elements can block external redundant light from entering, enable the lens and the lens barrel to be better supported, and enhance the structural stability of the optical imaging lens 2002.

[0138] Parameter D2s d3m d4s D4m d5s D5m D5bs d6s Value 4.41 3.79 3.98 4.66 4.53 7.05 6.80 5.92 Parameter d7m D7m d0m EP01 EP34 EP45 EP56 EP67 Value 7.51 9.98 10.24 0.56 0.28 0.58 1.72 1.99

[0139] Table 11

[0140] Example 6

[0141] Figure 4C The structural schematic diagram of the optical imaging lens 2003 according to Embodiment 6 of the present application is shown.

[0142] As Figure 4C shown, the optical imaging lens 2003 includes a lens barrel P0, a lens group, and a spacer element group. The lens group of the optical imaging lens 2003 is exactly the same as that of the optical imaging lens 2001 in Embodiment 4, and will not be described in detail. The optical imaging lens 2003 further includes a filter (not shown) for correcting color deviation, and the filter has an object side S17 and an image side S18. The optical imaging lens 2003 further includes a diaphragm STO (not shown) disposed on the object side of the first lens. Light from the object sequentially passes through the surfaces S1 to S18 and finally forms an image on an imaging surface S19 (not shown). The basic parameters of the optical imaging lens 2003 are shown in Tables 7 to 9 in detail and will not be described in detail.

[0143] As Figure 4C shown, the optical imaging lens 2003 further includes eight spacer elements, namely a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, a fifth auxiliary spacer element P5b, a sixth spacer element P6, and a seventh spacer element P7. The first spacer element P1 is disposed on the image side of the first lens and is at least partially in contact with the image side surface of the first lens; the second spacer element P2 is disposed on the image side of the second lens and is at least partially in contact with the image side surface of the second lens; the third spacer element P3 is disposed on the image side of the third lens and is at least partially in contact with the image side surface of the third lens; the fourth spacer element P4 is disposed on the image side of the fourth lens and is at least partially in contact with the image side surface of the fourth lens; the fifth spacer element P5 is disposed on the image side of the fifth lens and is at least partially in contact with the image side surface of the fifth lens; the fifth auxiliary spacer element P5b is disposed on the image side of the fifth spacer element and is at least partially in contact with the image side surface of the fifth spacer element; the sixth spacer element P6 is disposed on the image side of the sixth lens and is at least partially in contact with the image side surface of the sixth lens; the seventh spacer element P7 is disposed on the image side of the seventh lens and is at least partially in contact with the image side surface of the seventh lens.

[0144] Table 12 shows the basic parameter table of the spacer elements of the optical imaging lens 2003, and the unit of each parameter in Table 12 is millimeter (mm). The above spacer elements can block external redundant light from entering, enable the lens and the lens barrel to be better supported, and enhance the structural stability of the optical imaging lens 2003.

[0145] Parameter D2s d3m d4s D4m d5s D5m D5bs d6s Value 4.57 3.75 4.14 6.54 4.58 6.85 6.26 5.83 Parameter d7m D7m d0m EP01 EP34 EP45 EP56 EP67 Value 7.58 8.82 11.47 0.68 0.42 0.55 1.55 2.10

[0146] Table 12

[0147] Figure 5A Shows the axial chromatic aberration curves of the optical imaging lens 2001 of Embodiment 4, the optical imaging lens 2002 of Embodiment 5, and the optical imaging lens 2003 of Embodiment 6, which represent the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 5B Shows the astigmatism curves of the optical imaging lens 2001 of Embodiment 4, the optical imaging lens 2002 of Embodiment 5, and the optical imaging lens 2003 of Embodiment 6, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 5C Shows the distortion curves of the optical imaging lens 2001 of Embodiment 4, the optical imaging lens 2002 of Embodiment 5, and the optical imaging lens 2003 of Embodiment 6, which represent the distortion magnitude values corresponding to different image heights. Figure 5D Shows the longitudinal chromatic aberration curves of the optical imaging lens 2001 of Embodiment 4, the optical imaging lens 2002 of Embodiment 5, and the optical imaging lens 2003 of Embodiment 6, which represent the deviation of different image heights of light rays on the imaging plane after passing through the lens.

[0148] According to Figures 5A to 5D It can be seen that the optical imaging lenses 2001 of Embodiment 4, the optical imaging lenses 2002 of Embodiment 5, and the optical imaging lenses 2003 of Embodiment 6 can all achieve good imaging quality.

[0149] Example 7

[0150] Figure 6A Shows a schematic structural diagram of the optical imaging lens 3001 according to Embodiment 7 of the present application.

[0151] As Figure 6A Shown, the optical imaging lens 3001 includes a lens barrel P0, a lens group, and a spacer element group. The lens group sequentially includes, from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8. The first lens E1 has an object side surface S1 and an image side surface S2, the second lens E2 has an object side surface S3 and an image side surface S4, the third lens E3 has an object side surface S5 and an image side surface S6, the fourth lens E4 has an object side surface S7 and an image side surface S8, the fifth lens E5 has an object side surface S9 and an image side surface S10, the sixth lens E6 has an object side surface S11 and an image side surface S12, the seventh lens E7 has an object side surface S13 and an image side surface S14, and the eighth lens E8 has an object side surface S15 and an image side surface S16.

[0152] The optical imaging lens 3001 further includes a filter (not shown) for correcting color deviation, and the filter has an object side S17 and an image side S18. The optical imaging lens 3001 further includes a stop STO (not shown) disposed on the object side of the first lens. Light from an object sequentially passes through each surface S1 to S18 and finally forms an image on an imaging surface S19 (not shown).

[0153] Table 13 shows the basic parameter table of the lens group of the optical imaging lens 3001 in Embodiment 7, where the units of the radius of curvature, thickness / distance, and effective focal length are all millimeters (mm).

[0154]

[0155]

[0156] Table 13

[0157] Table 14 shows the high-order term coefficients of the aspherical mirrors that can be used in Embodiment 7, where each aspherical surface type can be defined by the formula (1) given in Embodiment 1 above.

[0158] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 3.9523E-02 -2.4625E-02 4.1162E-02 -4.0213E-02 8.0974E-04 2.4879E-02 -4.9358E-03 -1.6651E-02 -6.1962E-03 S2 -1.0339E-01 3.4234E-02 1.0047E-02 1.8530E-03 -1.2931E-02 -5.3600E-03 -2.8361E-03 -8.5102E-04 -6.4510E-04 S3 -2.9953E-01 1.2404E-02 -5.9227E-03 4.1089E-03 1.8542E-04 7.7192E-04 3.5247E-05 -3.4385E-05 -8.6297E-05 S4 -3.5415E-01 -9.4318E-03 -8.3682E-03 7.6672E-04 -5.6033E-04 3.3054E-04 9.9660E-05 -2.7388E-05 -3.8025E-05 S5 -1.9029E-01 -1.6300E-02 1.5976E-03 -1.2702E-04 -2.3162E-03 -1.7447E-03 -7.3447E-04 -3.2985E-04 -1.5282E-04 S6 -2.6625E-01 -5.5187E-03 1.2627E-02 -2.2909E-03 1.6026E-03 -3.2218E-03 5.2254E-04 -1.8698E-04 8.5027E-05 S7 -1.6795E-01 1.2315E-01 -4.8642E-02 -3.6255E-02 7.9239E-03 -4.0214E-03 -4.1236E-03 -7.0824E-03 -7.9914E-04 S8 1.5929E-02 1.6941E-01 -8.5831E-02 -2.5613E-03 3.9815E-02 3.2448E-03 -1.3845E-02 -7.3277E-03 -1.9376E-03 S9 3.5403E-01 5.4646E-02 2.4985E-02 1.6061E-02 4.2663E-03 3.1078E-03 2.5116E-04 1.2036E-04 -2.3475E-04 S10 2.9260E-01 -4.6184E-02 2.0153E-02 1.0524E-02 5.6848E-03 2.7957E-03 1.5554E-03 4.9668E-04 4.4050E-04 S11 -9.1477E+00 2.2175E+00 -1.4458E+00 1.9051E-01 -1.3000E-01 5.8622E-02 2.2449E-01 -7.3236E-02 5.3226E-02 S12 -3.2395E+00 7.5550E-01 -2.1869E-01 1.0889E-02 2.2151E-01 1.1601E-02 3.5677E-03 -1.3707E-02 1.6500E-03 S13 -1.5544E-01 -2.6116E-01 2.6791E-01 -1.5019E-01 -1.9177E-02 -1.8594E-02 -4.5869E-03 -5.4460E-03 3.2046E-04 S14 1.2511E+01 -1.5272E+00 -2.2899E+00 3.3523E-01 9.4456E-01 -5.0667E-01 -5.0413E-02 3.2283E-01 2.1551E-01 S15 -3.7599E+00 4.6297E+00 1.1514E+00 1.6180E+00 -5.1857E-01 -6.2747E-01 -4.0145E-02 5.5128E-01 -1.4483E-01 S16 -6.9415E+00 1.0912E+00 -6.3463E-01 1.0628E-01 -2.0540E-01 -2.5551E-03 -5.4413E-02 -1.0492E-02 -2.0717E-02

[0159] Table 14

[0160] Table 15 shows the effective focal length f of the optical imaging lens 3001 in Embodiment 7 and the sag heights of some lenses. The units of the parameters in Table 15 are all millimeters (mm).

[0161] Parameter f SAG12 SAG51 SAG61 SAG71 Value 5.44 0.04 -0.48 -0.28 -0.79

[0162] Table 15

[0163] As Figure 6AAs shown, the optical imaging lens 3001 further includes eight spacer elements, namely a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, a fifth auxiliary spacer element P5b, a sixth spacer element P6, and a seventh spacer element P7. The first spacer element P1 is disposed on the image side of the first lens and at least partially contacts the image side surface of the first lens; the second spacer element P2 is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens; the third spacer element P3 is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens; the fourth spacer element P4 is disposed on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens; the fifth spacer element P5 is disposed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; the fifth auxiliary spacer element P5b is disposed on the image side of the fifth spacer element and at least partially contacts the image side surface of the fifth spacer element; the sixth spacer element P6 is disposed on the image side of the sixth lens and at least partially contacts the image side surface of the sixth lens; the seventh spacer element P7 is disposed on the image side of the seventh lens and at least partially contacts the image side surface of the seventh lens.

[0164] Table 16 shows the basic parameter table of the spacer elements of the optical imaging lens 3001. The unit of each parameter in Table 16 is millimeter (mm). The above spacer elements can block external redundant light from entering, enable the lens and the lens barrel to better bear against each other, and enhance the structural stability of the optical imaging lens 3001.

[0165] Parameter D2s d3m d4s D4m d5s D5m D5bs d6s Value 4.75 3.81 4.14 5.13 4.58 7.32 6.62 6.07 Parameter d7m D7m d0m EP01 EP34 EP45 EP56 EP67 Value 7.95 10.74 11.29 0.84 0.49 0.47 1.66 2.06

[0166] Table 16

[0167] Example 8

[0168] Figure 6B shows a schematic structural diagram of an optical imaging lens 3002 according to Embodiment 8 of the present application.

[0169] As Figure 6B shown, the optical imaging lens 3002 includes a lens barrel P0, a lens group, and a spacer element group. The lens group of the optical imaging lens 3002 is exactly the same as that of the optical imaging lens 3001 in Embodiment 7 and will not be described in detail. The optical imaging lens 3002 further includes a filter (not shown) for correcting color deviation. The filter has an object side surface S17 and an image side surface S18. The optical imaging lens 3002 further includes a diaphragm STO (not shown) disposed on the object side of the first lens. Light from an object sequentially passes through each surface S1 to S18 and finally forms an image on an imaging surface S19 (not shown). The basic parameters of the optical imaging lens 3002 are shown in detail in Tables 13 to 15 and will not be described in detail.

[0170] As Figure 6BAs shown in the figure, the optical imaging lens 3002 further includes eight spacer elements, namely, a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, a fifth auxiliary spacer element P5b, a sixth spacer element P6, and a seventh spacer element P7. The first spacer element P1 is disposed on the image side of the first lens and is at least partially in contact with the image side surface of the first lens; the second spacer element P2 is disposed on the image side of the second lens and is at least partially in contact with the image side surface of the second lens; the third spacer element P3 is disposed on the image side of the third lens and is at least partially in contact with the image side surface of the third lens; the fourth spacer element P4 is disposed on the image side of the fourth lens and is at least partially in contact with the image side surface of the fourth lens; the fifth spacer element P5 is disposed on the image side of the fifth lens and is at least partially in contact with the image side surface of the fifth lens; the fifth auxiliary spacer element P5b is disposed on the image side of the fifth spacer element and is at least partially in contact with the image side surface of the fifth spacer element; the sixth spacer element P6 is disposed on the image side of the sixth lens and is at least partially in contact with the image side surface of the sixth lens; the seventh spacer element P7 is disposed on the image side of the seventh lens and is at least partially in contact with the image side surface of the seventh lens.

[0171] Table 17 shows the basic parameter table of the spacer elements of the optical imaging lens 3002. The unit of each parameter in Table 17 is millimeter (mm). The above spacer elements can block the entry of excess external light, enable the lens and the lens barrel to be better supported, and enhance the structural stability of the optical imaging lens 3002.

[0172] Parameter D2s d3m d4s D4m d5s D5m D5bs d6s Value 3.77 3.75 4.07 5.07 4.53 7.55 6.88 6.09 Parameter d7m D7m d0m EP01 EP34 EP45 EP56 EP67 Value 7.95 8.92 12.02 0.73 0.32 0.49 1.68 2.09

[0173] Table 17

[0174] Example 9

[0175] Figure 6C shows a schematic structural diagram of an optical imaging lens 3003 according to Embodiment 9 of the present application.

[0176] As Figure 6C shown, the optical imaging lens 3003 includes a lens barrel P0, a lens group, and a spacer element group. The lens group of the optical imaging lens 3003 is exactly the same as the lens group of the optical imaging lens 3001 in Embodiment 7 and will not be described in detail. The optical imaging lens 3003 further includes a filter (not shown) for correcting color deviation. The filter has an object side surface S17 and an image side surface S18. The optical imaging lens 3003 further includes a diaphragm STO (not shown) disposed on the object side of the first lens. Light from an object sequentially passes through each surface S1 to S18 and finally forms an image on an imaging surface S19 (not shown). The basic parameters of the optical imaging lens 3003 are shown in detail in Tables 13 to 15 and will not be described in detail.

[0177] As Figure 6CAs shown, the optical imaging lens 3003 further includes eight spacer elements, namely a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, a fifth auxiliary spacer element P5b, a sixth spacer element P6, and a seventh spacer element P7. The first spacer element P1 is disposed on the image side of the first lens and at least partially contacts the image side surface of the first lens; the second spacer element P2 is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens; the third spacer element P3 is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens; the fourth spacer element P4 is disposed on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens; the fifth spacer element P5 is disposed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; the fifth auxiliary spacer element P5b is disposed on the image side of the fifth spacer element and at least partially contacts the image side surface of the fifth spacer element; the sixth spacer element P6 is disposed on the image side of the sixth lens and at least partially contacts the image side surface of the sixth lens; the seventh spacer element P7 is disposed on the image side of the seventh lens and at least partially contacts the image side surface of the seventh lens.

[0178] Table 18 shows the basic parameter table of the spacer elements of the optical imaging lens 3003. The unit of each parameter in Table 18 is millimeter (mm). The above spacer elements can block the entry of excessive external light, enable the lens and the lens barrel to better bear against each other, and enhance the structural stability of the optical imaging lens 3003.

[0179] Parameter D2s d3m d4s D4m d5s D5m D5bs d6s Value 3.91 3.77 4.19 5.26 4.64 7.93 7.23 6.05 Parameter d7m D7m d0m EP01 EP34 EP45 EP56 EP67 Value 7.91 11.45 11.76 0.68 0.41 0.49 1.56 2.05

[0180] Table 18

[0181] Figure 7A shows the axial chromatic aberration curves of the optical imaging lens 3001 of Example 7, the optical imaging lens 3002 of Example 8, and the optical imaging lens 3003 of Example 9, which represent the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 7B shows the astigmatism curves of the optical imaging lens 3001 of Example 7, the optical imaging lens 3002 of Example 8, and the optical imaging lens 3003 of Example 9, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 7C shows the distortion curves of the optical imaging lens 3001 of Example 7, the optical imaging lens 3002 of Example 8, and the optical imaging lens 3003 of Example 9, which represent the distortion magnitude values corresponding to different image heights. Figure 7D shows the longitudinal chromatic aberration curves of the optical imaging lens 3001 of Example 7, the optical imaging lens 3002 of Example 8, and the optical imaging lens 3003 of Example 9, which represent the deviation of different image heights of light rays on the imaging plane after passing through the lens.

[0182] According to Figures 7A to 7DIt can be seen that the optical imaging lens 3001 of Embodiment 7, the optical imaging lens 3002 of Embodiment 8, and the optical imaging lens 3003 of Embodiment 9 can all achieve good imaging quality.

[0183] In summary, the optical imaging lenses of Embodiments 1 to 9 satisfy the relationships shown in Table 19.

[0184]

[0185]

[0186] Table 19

[0187] This application also provides an imaging device, whose electronic photosensitive element can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor device (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

[0188] The above description is only the preferred embodiments of this application and the explanation of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to the technical solutions formed by the specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by mutually replacing the above features with the (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An optical imaging lens, characterized in that: Comprising: A lens barrel, a lens group, and a spacer element group disposed within the lens barrel, wherein The lens group sequentially includes, from the object side to the image side along the optical axis: 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. Among them, the first lens, the fourth lens, and the fifth lens all have positive optical powers, and the second lens, the third lens, the sixth lens, the seventh lens, and the eighth lens all have negative optical powers; The spacer element group includes: a fifth spacer element, a sixth spacer element, and a seventh spacer element. The fifth spacer element is disposed between the fifth lens and the sixth lens and at least partially contacts the image side surface of the fifth lens. The sixth spacer element is disposed between the sixth lens and the seventh lens and at least partially contacts the image side surface of the sixth lens. The seventh spacer element is disposed between the seventh lens and the eighth lens and at least partially contacts the image side surface of the seventh lens; The optical imaging lens satisfies: 5.8 < f / EP56 + f / EP67 < 6.2 and -2.8 < f78 / EP67 < -2.0, where f is the effective focal length of the optical imaging lens, EP56 is the axial distance between the image side surface of the fifth spacer element and the object side surface of the sixth spacer element along the optical axis, EP67 is the axial distance between the image side surface of the sixth spacer element and the object side surface of the seventh spacer element along the optical axis, and f78 is the combined focal length of the seventh lens and the eighth lens; The number of lenses with optical power in the optical imaging lens is eight.

2. The optical imaging lens according to claim 1, wherein: The spacer element group further includes: a second spacer element disposed between the second lens and the third lens and at least partially contacting the image side surface of the second lens; The optical imaging lens satisfies: 1.4 < D2s / R3 < 1.8, where D2s is the outer diameter of the object side surface of the second spacer element in the direction perpendicular to the optical axis, and R3 is the curvature radius of the object side surface of the second lens.

3. The optical imaging lens according to claim 1, wherein: The optical imaging lens satisfies: 0.3 < |SAG71| / EP67 < 0.45, where SAG71 is the axial distance between the intersection of the object side surface of the seventh lens and the optical axis and the vertex of the effective radius of the object side surface of the seventh lens, and EP67 is the axial distance between the image side surface of the sixth spacer element and the object side surface of the seventh spacer element along the optical axis.

4. The optical imaging lens according to claim 1, wherein: The spacer element group further includes: a first spacer element disposed between the first lens and the second lens and at least partially contacting the image side surface of the first lens; The optical imaging lens satisfies: 2.15 < EP01 / CT1 < 3.35, where EP01 is the axial distance between the object side end face of the lens barrel and the object side surface of the first spacer element along the optical axis, and CT1 is the central thickness of the first lens on the optical axis.

5. The optical imaging lens according to claim 1, wherein: The spacer element group further includes: a first spacer element disposed between the first lens and the second lens and at least partially contacting the image side surface of the first lens; The optical imaging lens satisfies: 13.7 < EP01 / |SAG12| < 22.7, where EP01 is the distance along the optical axis from the object-side end face of the lens barrel to the object-side surface of the first spacer element, and SAG12 is the axial distance between the intersection of the image-side surface of the first lens and the optical axis and the vertex of the effective radius of the image-side surface of the first lens.

6. The optical imaging lens according to claim 1, wherein: The spacer element group further includes a fifth auxiliary spacer element disposed on the image side of the fifth spacer element and at least partially in contact with the image-side surface of the fifth spacer element; The optical imaging lens satisfies: -1.25 < D5bs / R8 < -0.8, where D5bs is the outer diameter of the object-side surface of the fifth auxiliary spacer element in a direction perpendicular to the optical axis, and R8 is the radius of curvature of the image-side surface of the fourth lens.

7. The optical imaging lens according to claim 1, wherein: The spacer element group further includes: a third spacer element and a fourth spacer element. The third spacer element is disposed between the third lens and the fourth lens and at least partially in contact with the image-side surface of the third lens. The fourth spacer element is disposed between the fourth lens and the fifth lens and at least partially in contact with the image-side surface of the fourth lens; The optical imaging lens satisfies: 29.85 < f34 / EP34 < 53.25, where f34 is the combined focal length of the third lens and the fourth lens, and EP34 is the distance along the optical axis between the image-side surface of the third spacer element and the object-side surface of the fourth spacer element.

8. The optical imaging lens according to claim 1, wherein: The spacer element group further includes: a third spacer element and a fourth spacer element. The third spacer element is disposed between the third lens and the fourth lens and at least partially in contact with the image-side surface of the third lens. The fourth spacer element is disposed between the fourth lens and the fifth lens and at least partially in contact with the image-side surface of the fourth lens; The optical imaging lens satisfies: -1.92 < d4s / d3m × (f3 / f4) < -1.74, where d4s is the inner diameter of the object-side surface of the fourth spacer element in a direction perpendicular to the optical axis, d3m is the inner diameter of the image-side surface of the third spacer element in a direction perpendicular to the optical axis, f3 is the effective focal length of the third lens, and f4 is the effective focal length of the fourth lens.

9. The optical imaging lens according to claim 1, wherein: The spacer element group further includes: a fourth spacer element disposed between the fourth lens and the fifth lens and at least partially in contact with the image-side surface of the fourth lens; The optical imaging lens satisfies: 1.59 < D4m / f4 + D5m / f5 < 1.96, where D4m is the outer diameter of the image-side surface of the fourth spacer element in a direction perpendicular to the optical axis, D5m is the outer diameter of the image-side surface of the fifth spacer element in a direction perpendicular to the optical axis, f4 is the effective focal length of the fourth lens, and f5 is the effective focal length of the fifth lens.

10. The optical imaging lens according to any one of claims 1-9, characterized in that The optical imaging lens satisfies: -0.66 < D7m / R13 + d7m / R15 < 0.12, where D7m is the outer diameter of the image side surface of the seventh spacer element in the direction perpendicular to the optical axis, d7m is the inner diameter of the image side surface of the seventh spacer element in the direction perpendicular to the optical axis, R13 is the radius of curvature of the object side surface of the seventh lens, and R15 is the radius of curvature of the object side surface of the eighth lens.

11. The optical imaging lens according to any one of claims 1-9, characterized in that The optical imaging lens satisfies: 12.9 < d5s / CT5 + d6s / CT6 < 13.7, where d5s is the inner diameter of the object side surface of the fifth spacer element in the direction perpendicular to the optical axis, d6s is the inner diameter of the object side surface of the sixth spacer element in the direction perpendicular to the optical axis, CT5 is the central thickness of the fifth lens on the optical axis, and CT6 is the central thickness of the sixth lens on the optical axis.

12. The optical imaging lens according to any one of claims 1-9, characterized in that The optical imaging lens satisfies: 0.64 < TD / f8 + d0m / d7m < 1.02, where TD is the distance on the optical axis from the object side surface of the first lens to the image side surface of the eighth lens, f8 is the effective focal length of the eighth lens, d0m is the inner diameter of the image side end surface of the lens barrel in the direction perpendicular to the optical axis, and d7m is the inner diameter of the image side surface of the seventh spacer element in the direction perpendicular to the optical axis.

13. The optical imaging lens according to any one of claims 1-9, characterized in that The optical imaging lens satisfies: 5.5 < EP56 / |SAG61| < 7.3, where EP56 is the axial spacing distance between the image side surface of the fifth spacer element and the object side surface of the sixth spacer element along the optical axis, and SAG61 is the axial distance between the intersection of the object side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object side surface of the sixth lens.

14. The optical imaging lens according to any one of claims 1 to 6, characterized in that: The spacer element group further includes: a fourth spacer element disposed between the fourth lens and the fifth lens and at least partially in contact with the image side surface of the fourth lens; The optical imaging lens satisfies: 0.9 < EP45 / |SAG51| < 1.25, where EP45 is the axial spacing distance between the image side surface of the fourth spacer element and the object side surface of the fifth spacer element along the optical axis, and SAG51 is the axial distance between the intersection of the object side surface of the fifth lens and the optical axis and the vertex of the effective radius of the object side surface of the fifth lens.

Images