Camera lens

Abstract

The embodiment of the utility model discloses a pick-up lens, the pick-up lens comprises a lens barrel, and a lens group and a spacing element group which are accommodated in the lens barrel, the lens group comprises eight lenses with focal power, and the eight lenses sequentially comprise a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens from an object side to an image side along an optical axis; the spacing element group at least comprises a third spacing element and a fourth spacing element; wherein the curvature radius R5 of the object side surface of the third lens, the curvature radius R6 of the image side surface of the third lens, the effective focal length f3 of the third lens and the inner diameter d3s of the object side surface of the third spacing element can meet the following conditions: (R5 / R6) * f3 / d3s is greater than-19.55 and less than-14.85; the effective focal length f4 of the fourth lens and the interval EP34 between the third spacing element and the fourth spacing element can meet the condition that f4 / EP34 is larger than 66.75 and smaller than 157.2.

Description

Technical Field

[0001] This application relates to the field of optical elements, and specifically, to a camera lens including eight lenses. Background Art

[0002] With the rapid development of portable electronic products such as smart phones, in order to meet people's shooting needs, the imaging requirements for the optical imaging systems in portable electronic products are becoming increasingly strict. Through the optical design of the optical imaging system, making the optical imaging system meet the requirements of a large image plane has become an industry development trend.

[0003] In order to meet the requirements of a large image plane, the optical imaging system is usually configured in a structure of multiple lenses. However, such an optical imaging system including multiple lenses, while better meeting the photography requirements, also causes some lenses to be more sensitive during the assembly process, and stray light is likely to be generated inside the lens, thereby affecting the imaging quality and thus the product competitiveness of the optical imaging system. Summary of the Utility Model

[0004] An embodiment of this application provides a camera lens, which includes a lens barrel and a lens group and a spacer element group accommodated in the lens barrel. The lens group includes eight lenses with optical power, and in sequence from the object side to the image side along the optical axis, it includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens; the spacer element group includes at least a third spacer element and a fourth spacer element. The third spacer element is placed between the third lens and the fourth lens and at least partially contacts the image side surface of the third lens, and the fourth spacer element is placed between the fourth lens and the fifth lens and at least partially contacts the image side surface of the fourth lens; wherein, the radius of curvature R5 of the object side surface of the third lens, the radius of curvature R6 of the image side surface of the third lens, the effective focal length f3 of the third lens, and the inner diameter d3s of the object side surface of the third spacer element satisfy: -19.55 < (R5 / R6) * f3 / d3s < -14.85; the effective focal length f4 of the fourth lens and the interval EP34 between the third spacer element and the fourth spacer element satisfy: 66.75 < f4 / EP34 < 157.2.

[0005] In one embodiment, the spacer element group further includes a second spacer element placed between the second lens and the third lens and at least partially contacting the image side surface of the second lens. The air interval T23 between the second lens and the third lens on the optical axis, the air interval T34 between the third lens and the fourth lens on the optical axis, and the interval EP23 between the second spacer element and the third spacer element satisfy: 1.1 < T23 / (EP23 + T34) < 1.3.

[0006] In one embodiment, the spacer element group further includes a fifth spacer element disposed between the fifth lens and the sixth lens and at least partially contacting the image side surface of the fifth lens. The air gap T45 between the fourth lens and the fifth lens on the optical axis, the air gap T56 between the fifth lens and the sixth lens on the optical axis, and the gap EP45 between the fourth spacer element and the fifth spacer element satisfy: 1.18 ≤ T56 / (T45 + EP45) ≤ 1.72.

[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 contacting the image side surface of the first lens, and 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 radius of curvature R2 of the image side surface of the first lens, the radius of curvature R4 of the image side surface of the second lens, the outer diameter D1s of the object side surface of the first spacer element, and the outer diameter D2s of the object side surface of the second spacer element satisfy: 0.8 < R4*D2s / (D1s*R2) ≤ 0.92.

[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 contacting the image side surface of the first lens. The radius of curvature R1 of the object side surface of the first lens, the outer diameter D1m of the image side surface of the first spacer element, and the inner diameter d1m of the image side surface of the first spacer element satisfy: 1.56 ≤ R1 / (D1m - d1m) < 1.8.

[0009] 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 contacting the image side surface of the first lens, and 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 gap EP12 between the first spacer element and the second spacer element and the axial distance SAG22 between the intersection of the image side surface of the second lens and the optical axis and the vertex of the effective radius of the image side surface of the second lens satisfy: 2.1 < EP12 / SAG22 ≤ 2.53.

[0010] In one embodiment, the air gap T34 between the third lens and the fourth lens on the optical axis, the air gap T45 between the fourth lens and the fifth lens on the optical axis, the maximum thickness CP3 of the third spacer element, and the maximum thickness CP4 of the fourth spacer element satisfy: 3.9 < (T34 + T45) / (CP3 + CP4) ≤ 5.92.

[0011] In one embodiment, the spacer element group further includes a sixth spacer element disposed between the sixth lens and the seventh lens and at least partially in contact with the image side surface of the sixth lens. The maximum thickness CP6 of the sixth spacer element and the axial distance SAG71 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 satisfy: 1.35 < CP6 / |SAG71| < 2.6.

[0012] In one embodiment, the spacer element group further includes a fifth spacer element disposed between the fifth lens and the sixth lens and at least partially in contact with the image side surface of the fifth lens, a sixth spacer element disposed between the sixth lens and the seventh lens and at least partially in contact with the image side surface of the sixth lens, and 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 outer diameter D5m of the image side surface of the fifth spacer element, the outer diameter D6m of the image side surface of the sixth spacer element, and the outer diameter D7m of the image side surface of the seventh spacer element satisfy: 0.75 < (D6m - D5m) / (D7m - D6m) < 2.0.

[0013] In one embodiment, the spacer element group further includes a sixth spacer element disposed between the sixth lens and the seventh lens and at least partially in contact with the image side surface of the sixth lens, and 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 combined focal length f78 of the seventh lens and the eighth lens and the interval EP67 between the sixth spacer element and the seventh spacer element satisfy: 13.2 < f78 / EP67 < 50.1.

[0014] In one embodiment, the effective focal length f8 of the eighth lens, the refractive index N8 of the eighth lens, the outer diameter D0m of the rearmost end surface of the lens barrel closest to the image side, and the inner diameter d0m of the rearmost end surface of the lens barrel closest to the image side satisfy: -15.35 < f8 * N8 / (D0m - d0m) < -7.7.

[0015] In one embodiment, the inner diameter d0s of the frontmost end surface of the lens barrel closest to the object side, the inner diameter d0m of the rearmost end surface of the lens barrel closest to the image side, and the effective focal length f of the imaging lens satisfy: 1.2 < (d0m - d0s) / f ≤ 1.34.

[0016] 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 curvature radius R1 of the object side surface of the first lens, the refractive index N1 of the first lens, the outer diameter D1s of the object side surface of the first spacer element, and the inner diameter d1s of the object side surface of the first spacer element satisfy: 2.4 < R1 * N1 / (D1s - d1s) ≤ 2.72.

[0017] 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 contacting the image side surface of the first lens, and 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 radius of curvature R3 of the object side surface of the second lens, the radius of curvature R4 of the image side surface of the second lens, the inner diameter d1m of the image side surface of the first spacer element, and the inner diameter d2s of the object side surface of the second spacer element satisfy: 1.95 < (R3 * d1m) / (R4 * d2s) < 2.4.

[0018] In one embodiment, the spacer element group further includes a fifth spacer element disposed between the fifth lens and the sixth lens and at least partially contacting the image side surface of the fifth lens, and a sixth spacer element disposed between the sixth lens and the seventh lens and at least partially contacting the image side surface of the sixth lens. The combined focal length f56 of the fifth lens and the sixth lens, the interval EP56 between the fifth spacer element and the sixth spacer element, and the maximum thickness CP5 of the fifth spacer element satisfy: -60.9 < f56 / (EP56 + CP5) < -18.6.

[0019] In one embodiment, the first lens has a positive optical power, its object side surface is convex, and its image side surface is concave; the second lens has a negative optical power, its object side surface is convex, and its image side surface is concave; the third lens has a negative optical power, its object side surface is convex, and its image side surface is concave; the fourth lens has a positive optical power, and both its object side surface and image side surface are convex; the fifth lens has a positive or negative optical power, and its image side surface is convex; the sixth lens has a negative optical power, its object side surface is convex, and its image side surface is concave; the seventh lens has a positive optical power, its object side surface is convex, and its image side surface is concave; the eighth lens has a negative optical power, its object side surface is convex, and its image side surface is concave.

[0020] The camera lens provided by the embodiment of the present application adopts an eight-piece lens group. By controlling the bending direction of the third lens, the system field curvature can be effectively controlled, and the imaging quality of the camera lens can be improved. However, this also makes the third lens more sensitive during the assembly process, and internal stray light is likely to be generated in the structural areas of the third lens and the fourth lens. By controlling the camera lens to satisfy the conditional formula -19.55 < (R5 / R6)*f3 / d3s < -14.85 and 66.75 < f4 / EP34 < 157.2, on the one hand, satisfying -19.55 < (R5 / R6)*f3 / d3s can reduce the sensitivity of the third lens during assembly and improve the assembly stability of the camera lens; on the other hand, by controlling 66.75 < f4 / EP34 < 157.2 within a certain range, it is beneficial to ensure the normal imaging of the camera lens. The fourth lens has a positive optical power and has a converging effect on the outgoing light of the third lens, which can make the incident light enter the lens interior more completely, ensure that the light transmission amounts of the third lens and the fourth lens are within a reasonable range, reduce energy loss, and effectively avoid the risk of internal stray light in the fourth lens, thereby improving the imaging quality of the camera lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments read with reference to the accompanying drawings:

[0022] Figure 1 It shows the structural arrangement and partial parameter schematic diagram of the camera lens provided by the embodiment of the present application;

[0023] Figure 2 It shows the structural schematic diagram of the camera lens according to Embodiment 1 of the present application;

[0024] Figure 3 It shows the structural schematic diagram of the camera lens according to Embodiment 2 of the present application;

[0025] Figures 4A to 4C It respectively shows the axial chromatic aberration curve, astigmatism curve, and distortion curve of the camera lens according to Embodiment 1 or 2 of the present application;

[0026] Figure 5 It shows the structural schematic diagram of the camera lens according to Embodiment 3 of the present application;

[0027] Figure 6 It shows the structural schematic diagram of the camera lens according to Embodiment 4 of the present application;

[0028] Figures 7A to 7C It respectively shows the axial chromatic aberration curve, astigmatism curve, and distortion curve of the camera lens according to Embodiment 3 or 4 of the present application;

[0029] Figure 8Shows a schematic structural diagram of a camera lens according to Embodiment 5 of the present application;

[0030] Figure 9 Shows a schematic structural diagram of a camera lens according to Embodiment 6 of the present application;

[0031] Figures 10A to 10C Respectively show the axial chromatic aberration curve, astigmatism curve, and distortion curve of the camera lens according to Embodiment 5 or 6 of the present application;

[0032] Figure 11 Shows a schematic structural diagram of a camera lens according to Embodiment 7 of the present application;

[0033] Figure 12 Shows a schematic structural diagram of a camera lens according to Embodiment 8 of the present application;

[0034] Figures 13A to 13C Respectively show the axial chromatic aberration curve, astigmatism curve, and distortion curve of the camera lens according to Embodiment 7 or 8 of the present application;

[0035] Figure 14 Shows an energy schematic diagram of stray light of Sample 1 of the camera lens;

[0036] Figure 15 Shows an energy schematic diagram of stray light of Sample 2 of the camera lens; and

[0037] Figure 16 Shows an energy schematic diagram of stray light of Sample 3 of the camera lens. 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, and third are only used to distinguish one feature from another feature and do not represent any limitation on the feature. 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 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 document, 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 closest to the object to be photographed is called the object side surface of the lens, and the surface of each lens closest 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, denote the presence of the stated features, elements and / or components, but do not preclude 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 a list of listed features, it modifies the entire list of listed features, rather than an individual element in the list. In addition, when describing 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 used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms (such as those defined in a common dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0044] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The following embodiments only represent several implementation manners of the present application, and their descriptions are relatively specific and detailed, but should not be construed as a limitation on the patent scope of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can be made, and these all belong to the protection scope of the present application. For example, the lens groups (i.e., the first lens to the sixth lens), the lens barrel structure and the spacer elements in the embodiments of the present application can be combined arbitrarily, and it is not limited that the lens group in one embodiment can only be combined with the lens barrel structure, spacer elements, etc. in that embodiment.

[0045] The features, principles and other aspects of the present application will be described in detail below with reference to the drawings.

[0046] Reference Figure 1As shown, a first aspect of the present application provides such a camera lens, which may include a lens barrel, a lens group, and a spacer element group, where the spacer element group may include at least one spacer element. Both the lens group and the spacer element group are accommodated in the lens barrel.

[0047] In an exemplary embodiment, the lens barrel may include a front end face, a rear end face, an outer ring face, and an inner ring face. Among them, the front end face may be, for example, the end face closest to the object side and perpendicular to the optical axis, and the rear end face may be, for example, the end face closest to the image side and perpendicular to the optical axis; in a direction perpendicular to the optical axis, the surface of the lens barrel farthest from the optical axis is the outer ring face, and the surface of the lens barrel closest to the optical axis is the inner ring face. In an exemplary embodiment, the inner ring face of the lens barrel may be stepped.

[0048] In an exemplary embodiment, the lens group may include eight lenses with optical power, which are, in order from the object side to the image side along the optical axis: a first lens with optical power, a second lens with optical power, a third lens with negative optical power, a fourth lens with positive optical power, a fifth lens with optical power, a sixth lens with optical power, a seventh lens with optical power, and an eighth lens with optical power. The first lens to the eighth lens in the lens group are arranged in sequence from the object side of the subject to the image side along the optical axis, and each lens has at least one object side facing the object side and one image side facing the image side. Among them, there may be a spacing distance between any two adjacent lenses of the first lens to the eighth lens.

[0049] In an exemplary embodiment, the first lens may have positive optical power, its object side may be convex, and its image side may be concave. The second lens may have negative optical power, its object side may be convex, and its image side may be concave. The third lens may have negative optical power, its object side may be convex, and its image side may be concave. The fourth lens may have positive optical power, and both its object side and image side may be convex. The fifth lens may have positive or negative optical power, its object side may be concave or convex, and its image side may be convex. The sixth lens may have negative optical power, its object side may be convex, and its image side may be concave. The seventh lens may have positive optical power, its object side may be convex, and its image side may be concave. The eighth lens may have negative optical power, its object side may be convex, and its image side may be concave.

[0050] In an exemplary embodiment, the set of spacer elements may include at least one of the following: 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, 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, a third spacer element disposed between the third lens and the fourth lens and at least partially contacting the image side surface of the third lens, 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, a fifth spacer element disposed between the fifth lens and the sixth lens and at least partially contacting the image side surface of the fifth lens, a sixth spacer element disposed between the sixth lens and the seventh lens and at least partially contacting the image side surface of the sixth lens, and a seventh spacer element disposed between the seventh lens and the eighth lens and at least partially contacting the image side surface of the seventh lens. Reasonable use of the spacer elements can improve the assembly stability of the camera lens, thereby ensuring better structural performance of the system; it can also effectively avoid the risk of stray light, reduce the interference to the image quality, and thus improve the imaging quality of the camera lens.

[0051] In an exemplary embodiment, at least one trimmed lens may be provided in the lens group. The outer peripheral surface of the trimmed lens may have a trimmed portion and an untrimmed portion, and the outer diameter of the trimmed portion of the lens is smaller than the outer diameter of the untrimmed portion of the lens. When the outer peripheral surface of the lens has a trimmed portion, the outer diameter of the lens generally refers to the outer diameter of the untrimmed portion of the lens, and the outer diameter of the spacer element generally refers to the maximum outer diameter of the untrimmed portion.

[0052] Figure 1 Some parameters of the lens barrel of a camera lens and some of the spacer elements in the set of spacer elements according to the present application are also exemplarily shown for better understanding of the present application. As Figure 1As shown, EP12 represents the interval between the first spacer element and the second spacer element (the distance along the optical axis direction from the image side surface of the first spacer element to the object side surface of the second spacer element); EP23 represents the interval between the second spacer element and the third spacer element (the distance along the optical axis direction from the image side surface of the second spacer element to the object side surface of the third spacer element); EP34 represents the interval between the third spacer element and the fourth spacer element; EP45 represents the interval between the fourth spacer element and the fifth spacer element; EP56 represents the interval between the fifth spacer element and the sixth spacer element; EP67 represents the interval between the sixth spacer element and the seventh spacer element; CP3 represents the maximum thickness of the third spacer element, CP4 represents the maximum thickness of the fourth spacer element, CP6 represents the maximum thickness of the sixth spacer element, d0s represents the inner diameter of the front end face of the lens barrel (the end face closest to the object side in the plane perpendicular to the optical axis); d0m represents the inner diameter of the rear end face of the lens barrel (the end face closest to the image side in the plane perpendicular to the optical axis); D1s represents the outer diameter of the object side surface of the first spacer element; d1s represents the inner diameter of the object side surface of the first spacer element; D1m represents the outer diameter of the image side surface of the first spacer element; d1m represents the inner diameter of the image side surface of the first spacer element; D2s is the outer diameter of the object side surface of the second spacer element; d2s represents the inner diameter of the object side surface of the second spacer element, and so on. Those skilled in the art should understand that some parameters frequently used in the art, such as the central thickness CT1 of the first lens on the optical axis, are not shown in Figure 1 the figure.

[0053] The camera lens according to the exemplary embodiment of the present application can satisfy: -19.55 < (R5 / R6)*f3 / d3s < -14.85; 66.75 < f4 / EP34 < 157.2, where R5 is the curvature radius of the object side surface of the third lens, R6 is the curvature radius of the image side surface of the third lens, f3 is the effective focal length of the third lens, d3s is the inner diameter of the object side surface of the third spacer element, f4 is the effective focal length of the fourth lens, and EP34 is the distance between the third spacer element and the fourth spacer element. Satisfying the conditional formula -19.55 < (R5 / R6)*f3 / d3s < -14.85 within a certain range can effectively control the field curvature of the system by controlling the bending direction of the third lens and improve the image quality of the system; at the same time, satisfying the conditional formula 66.75 < f4 / EP34 < 157.2 within a certain range is beneficial to ensuring the imaging requirements of the camera lens. The fourth lens has a positive optical power and converges the outgoing light of the third lens, which can make the incident light enter the camera lens more completely, effectively avoiding the risk of internal stray light in the fourth lens while reducing energy loss. By controlling the size of the distance EP34 between the third spacer element and the fourth spacer element, the optical path length of the light passing through the third lens and the fourth lens can be controlled, improving the assembly stability of the third lens and the fourth lens; furthermore, by reasonably setting the inner diameter d3s of the third spacer element, the light transmission amount of the third lens and the fourth lens can be guaranteed within a reasonable range, and the third spacer element is used to intercept the marginal stray light, reducing the generation of stray light, thereby improving the imaging quality of the camera lens.

[0054] In the exemplary embodiment, the camera lens can satisfy: 1.1 < T23 / (EP23 + T34) < 1.3, where T23 is the air gap between the second lens and the third lens on the optical axis, T34 is the air gap between the third lens and the fourth lens on the optical axis, and EP23 is the distance between the second spacer element and the third spacer element. Satisfying this conditional formula can better control the step difference between the second spacer element, the third lens and the fourth lens by controlling the ratio of the air gap T23 between the second lens and the third lens on the optical axis to the sum of the distance EP23 between the second spacer element and the third spacer element and the air gap T34 between the third lens and the fourth lens on the optical axis, optimize the lens structure, and ensure the overall assembly stability of the system.

[0055] In an exemplary embodiment, the camera lens may satisfy: 1.18 ≤ T56 / (T45 + EP45) ≤ 1.72, where EP45 is the distance between the fourth spacer element and the fifth spacer element, T45 is the air space between the fourth lens and the fifth lens on the optical axis, and T56 is the air space between the fifth lens and the sixth lens on the optical axis. Satisfying this conditional formula and controlling the distance EP45 between the fourth spacer element and the fifth spacer element along the optical axis helps to control the edge thickness of the fifth lens and reduce the difficulty of forming the fifth lens; controlling the ratio of the air space T56 between the fifth lens and the sixth lens on the optical axis to the sum of the air space T45 between the fourth lens and the fifth lens on the optical axis and the distance EP45 between the fourth spacer element and the fifth spacer element along the optical axis within a certain range is beneficial to improving the assembly stability of the fifth lens and the fifth spacer element and improving the problem of low assembly yield caused by the matching amount between the fourth lens, the fifth lens, the fourth spacer element, and the fifth spacer element.

[0056] In an exemplary embodiment, the camera lens may satisfy: 0.8 < R4*D2s / (D1s*R2) ≤ 0.92, where R2 is the radius of curvature of the image side of the first lens, R4 is the radius of curvature of the image side of the second lens, D1s is the outer diameter of the object side of the first spacer element, and D2s is the outer diameter of the object side of the second spacer element. Satisfying this conditional formula within a certain range is beneficial to meeting the requirements of lens performance and imaging quality. Specifically, the radius of curvature R4 of the image side of the second lens and the radius of curvature R2 of the image side of the first lens determine the concavity and convexity of the image sides of the first lens and the second lens, affect the outgoing state of light from the first lens and the second lens, and thus can affect the imaging effect of the lens; at the same time, constraining the ratio of the outer diameter of the object side of the second spacer element to that of the first spacer element within a reasonable range is beneficial to ensuring the stability of the lens assembly gap.

[0057] In an exemplary embodiment, the camera lens may satisfy: 1.56 ≤ R1 / (D1m - d1m) < 1.8, where D1m is the outer diameter of the image side of the first spacer element, d1m is the inner diameter of the image side of the first spacer element, and R1 is the radius of curvature of the object side of the first lens. Satisfying this conditional formula can control the interception of the outgoing light of the first lens by the first spacer element. Under the condition of ensuring the lens illuminance, the more light is blocked, the better the stray light is improved, and the higher the imaging quality of the lens is.

[0058] In an exemplary embodiment, the camera lens may satisfy: 2.1 < EP12 / SAG22 ≤ 2.53, where SAG22 is the axial distance between the intersection of the image side surface of the second lens and the optical axis and the vertex of the effective radius of the image side surface of the second lens, and EP12 is the distance between the first spacer element and the second spacer element. Satisfying this conditional expression, by controlling the ratio of the distance EP12 between the first spacer element and the second spacer element to the axial distance SAG22 between the intersection of the image side surface of the second lens and the optical axis and the vertex of the effective radius of the image side surface of the second lens, it is beneficial to adjust the chief ray angle of the system, effectively improve the relative brightness of the system, and enable the system to form a clear image; by restricting the distance between the first spacer element and the second spacer element along the optical axis, the risk of deformation of the second lens during the assembly process can be effectively reduced.

[0059] In an exemplary embodiment, the camera lens may satisfy: 3.9 < (T34 + T45) / (CP3 + CP4) ≤ 5.92, where T34 is the air gap between the third lens and the fourth lens on the optical axis, T45 is the air gap between the fourth lens and the fifth lens on the optical axis, CP3 is the maximum thickness of the third spacer element, and CP4 is the maximum thickness of the fourth spacer element. Satisfying this conditional expression, where the air gap T34 between the third lens and the fourth lens on the optical axis and the maximum thickness CP3 of the third spacer element determine the profiles of the image side surface of the third lens and the object side surface of the fourth lens, and the air gap T45 between the fourth lens and the fifth lens on the optical axis and the maximum thickness CP4 of the fourth spacer element determine the profiles of the image side surface of the fourth lens and the object side surface of the fifth lens, controlling this conditional expression within a certain range directly affects the optimization and improvement degree of the internal stray light of the third lens, the fourth lens, and the fifth lens, helps to improve the internal stray light of the third lens, the fourth lens, and the fifth lens, and thus improves the imaging quality of the system.

[0060] In an exemplary embodiment, the camera lens may satisfy: 1.35 < CP6 / |SAG71| < 2.6, where CP6 is the maximum thickness of the sixth spacer element, and 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. Satisfying this conditional expression, by controlling the ratio of the maximum thickness CP6 of the sixth spacer element to the absolute value of the axial distance SAG71 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 within a certain range, it can ensure a large refractive power for off-axis fields, thus ensuring the stray light stability of the camera lens. At the same time, it is also beneficial to shorten the overall length of the lens and improve the resolution of the system.

[0061] In an exemplary embodiment, the camera lens may satisfy: 0.75 < (D6m - D5m) / (D7m - D6m) < 2.0, where D6m is the outer diameter of the image side of the sixth spacer element, D5m is the outer diameter of the image side of the fifth spacer element, and D7m is the outer diameter of the image side of the seventh spacer element. Satisfying this conditional expression and reasonably controlling the relationship between the outer diameter of the image side of the sixth spacer element, the outer diameter of the image side of the fifth spacer element, and the outer diameter of the image side of the seventh spacer element P7 is conducive to the system having a larger imaging surface, optimizing the overall structure of the camera lens, reducing the assembly difficulty, and making the spatial distribution of the system more reasonable.

[0062] In an exemplary embodiment, the camera lens may satisfy: 13.2 < f78 / EP67 < 50.1, where f78 is the combined focal length of the seventh lens and the eighth lens, and EP67 is the distance between the sixth spacer element and the seventh spacer element. Satisfying this conditional expression and constraining the range of the ratio of the combined focal length of the seventh lens and the eighth lens to the distance between the sixth spacer element and the seventh spacer element can make the combination of the seventh lens and the eighth lens act as an optical element group with a reasonable negative optical power, balancing the aberration generated by the optical element group with a positive optical power at the front end, so that the camera lens can obtain good imaging quality; further controlling the distance between the sixth spacer element and the seventh spacer element is conducive to improving the assembly stability and imaging quality of the camera lens.

[0063] In an exemplary embodiment, the camera lens may satisfy: -15.35 < f8*N8 / (D0m - d0m) < -7.7, where f8 is the effective focal length of the eighth lens, N8 is the refractive index of the eighth lens, D0m is the outer diameter of the rear end face of the lens barrel closest to the imaging surface, and d0m is the inner diameter of the rear end face of the lens barrel closest to the imaging surface. By satisfying this conditional expression, the amount of light passing through the eighth lens can be effectively controlled, which is conducive to achieving the imaging effect of a large image surface and ensuring the imaging quality of the system; constraining the difference between the outer diameter and the inner diameter of the rear end face of the lens barrel within a reasonable range can avoid the problem of easy deformation during the assembly process and improve the overall assembly stability.

[0064] In an exemplary embodiment, the camera lens may satisfy: 1.2 < (d0m - d0s) / f ≤ 1.34, where d0s is the inner diameter of the front end face of the lens barrel closest to the object side, d0m is the inner diameter of the rear end face of the lens barrel closest to the imaging surface, and f is the effective focal length of the optical imaging system. The inner diameter d0s of the object side end face and the inner diameter d0m of the image side end face of the lens barrel determine the degree of light path occlusion by the lens barrel. By controlling this conditional expression within a certain range, the amount of light entering the system can be effectively controlled, ensuring the angular range in which the light beam in the object space can be imaged on the chip image surface after passing through the optical system; controlling the difference between the inner diameters of the object side end face and the image side end face of the lens barrel within a reasonable range is conducive to improving the overall assembly stability.

[0065] In an exemplary embodiment, the camera lens may satisfy: 2.4 < R1*N1 / (D1s - d1s) ≤ 2.72, where R1 is the radius of curvature of the object side surface of the first lens, N1 is the refractive index of the first lens, D1s is the outer diameter of the object side surface of the first spacer element, and d1s is the inner diameter of the object side surface of the first spacer element. By satisfying this conditional expression, since the inner diameter d1s and the outer diameter D1s of the object side surface of the first spacer element determine the contact area between the first lens and the object side surface of the first spacer element, the entry of light can be controlled by controlling the product of the radius of curvature and the refractive index of the first lens. By reasonably controlling the product of the ratio of the refractive index N1 of the first lens, the difference between the outer diameter D1s and the inner diameter d1s of the object side surface of the first spacer element, and the radius of curvature R1 of the object side surface of the first lens within a certain range, the annular width of the first spacer element can be made reasonable, which is beneficial to reducing the sensitivity of the first lens and improving the overall assembly stability.

[0066] In an exemplary embodiment, the camera lens may satisfy: 1.95 < (R3*d1m) / (R4*d2s) < 2.4, where R3 is the radius of curvature of the object side surface of the second lens, R4 is the radius of curvature of the image side surface of the second lens, d1m is the inner diameter of the image side surface of the first spacer element, and d2s is the inner diameter of the object side surface of the second spacer element. By satisfying this conditional expression, it is beneficial to ensure the lens assembly stability. Since the radius of curvature R3 of the object side surface of the second lens and the radius of curvature R4 of the image side surface of the second lens determine the overall contour of the second lens, the inner diameter d1m of the image side surface of the first spacer element determines the contact area between the first spacer element and the object side surface of the second lens, and the outer diameter d2s of the object side surface of the second spacer element determines the contact area between the second spacer element and the image side surface of the second lens. Controlling this conditional expression within a reasonable range is beneficial to reducing the internal stray light in the structural area of the second lens and improving the assembly stability of the lens.

[0067] In an exemplary embodiment, the camera lens may satisfy: -60.9 < f56 / (EP56 + CP5) < -18.6, where f56 is the combined focal length of the fifth lens and the sixth lens, EP56 is the distance between the fifth spacer element and the sixth spacer element, and CP5 is the maximum thickness of the fifth spacer element. Meeting this conditional formula is beneficial to ensuring lens molding. Among them, the distance EP56 between the fifth spacer element and the sixth spacer element along the optical axis helps to control the edge thickness of the sixth lens, reduces the difficulty of molding the sixth lens, and is beneficial for the lens to meet the requirements of structural control and assembly stability. The greater the maximum thickness CP5 of the fifth spacer element, the better the assembly stability. By controlling the ratio of the combined focal length f56 of the fifth lens and the sixth lens to the sum of EP56 and CP5 within a certain range, it helps to improve stray light and reduce the transmission of some non-imaging light caused by penetrating light between lenses, thereby improving the imaging quality of the lens.

[0068] The second aspect of the present application also provides such a camera lens, which in combination with Figure 1 as shown, may include a lens barrel and a lens group and a spacer element group accommodated in the lens barrel.

[0069] In an exemplary embodiment, the lens group may include eight lenses with optical power, which are, in order from the object side to the image side along the optical axis: a first lens with positive optical power, whose object side is convex and image side is concave; a second lens with negative optical power, whose object side is convex and image side is concave; a third lens with negative optical power, whose object side is convex and image side is concave; a fourth lens with positive optical power, whose object side is convex and image side is convex; a fifth lens with positive or negative optical power, whose object side is concave or convex and image side is convex; a sixth lens with negative optical power, whose object side is convex and image side is concave; a seventh lens with positive optical power, whose object side is convex and image side is concave; and an eighth lens with negative optical power, whose object side is convex and image side is concave. Among them, there may be a spacing distance between any two adjacent lenses among the first lens to the eighth lens.

[0070] In an exemplary embodiment, the spacer element group may at least include a sixth spacer element placed between the sixth lens and the seventh lens and at least partially in contact with the image side of the sixth lens, and a seventh spacer element placed between the seventh lens and the eighth lens and at least partially in contact with the image side of the seventh lens.

[0071] The camera lens according to an exemplary embodiment of the present application satisfies: 13.2 < f78 / EP67 < 50.1, where f78 is the combined focal length of the seventh lens and the eighth lens, and EP67 is the distance between the sixth spacer element and the seventh spacer element. By satisfying this conditional expression and restricting the range of the ratio of the combined focal length of the seventh lens and the eighth lens to the distance between the sixth spacer element and the seventh spacer element, the seventh lens and the eighth lens can be combined to form an optical component group with a reasonable negative optical power, which can balance the aberration generated by the optical component group with a positive optical power at the front end, so that the camera lens can obtain good imaging quality; further controlling the distance between the sixth spacer element and the seventh spacer element is beneficial to improving the assembly stability and imaging quality of the camera lens.

[0072] A third aspect of the present application also provides such a camera lens, as shown in combination with Figure 1 It may include a lens barrel and a lens group and a spacer element group accommodated in the lens barrel.

[0073] In an exemplary embodiment, the lens group may include eight lenses with optical power, which are, in order from the object side to the image side along the optical axis: a first lens with positive optical power, whose object side is convex and image side is concave; a second lens with negative optical power, whose object side is convex and image side is concave; a third lens with negative optical power, whose object side is convex and image side is concave; a fourth lens with positive optical power, whose object side is convex and image side is convex; a fifth lens with positive or negative optical power, whose object side is concave or convex and image side is convex; a sixth lens with negative optical power, whose object side is convex and image side is concave; a seventh lens with positive optical power, whose object side is convex and image side is concave; and an eighth lens with negative optical power, whose object side is convex and image side is concave. Among them, there may be a distance between any two adjacent lenses among the first lens to the eighth lens.

[0074] In an exemplary embodiment, the spacer element group may at least include a fifth spacer element disposed between the fifth lens and the sixth lens and at least partially contacting the image side of the fifth lens, and a sixth spacer element disposed between the sixth lens and the seventh lens and at least partially contacting the image side of the sixth lens.

[0075] The camera lens provided according to an exemplary embodiment of the present application can satisfy: -60.9 < f56 / (EP56 + CP5) < -18.6, where f56 is the combined focal length of the fifth lens and the sixth lens, EP56 is the distance between the fifth spacer element and the sixth spacer element, and CP5 is the maximum thickness of the fifth spacer element. Meeting this conditional formula is beneficial to ensuring lens molding. Among them, the distance EP56 between the fifth spacer element and the sixth spacer element along the optical axis helps to control the edge thickness of the sixth lens, reduce the difficulty of molding the sixth lens, and is beneficial for the lens to meet the requirements of structural control and assembly stability. The larger the maximum thickness CP5 of the fifth spacer element, the better the assembly stability. By controlling the ratio of the combined focal length f56 of the fifth lens and the sixth lens to the sum of EP56 and CP5 within a certain range, it helps to improve stray light, reduce the transmission of some non-imaging light caused by penetrating light between lenses, and thus improve the imaging quality of the lens.

[0076] It should be understood that the present application does not specifically limit the number of spacer elements. Any number of spacer elements can be included between any two lenses, and the entire camera lens can also include any number of spacer elements. The spacer element helps the camera lens intercept redundant refractive and reflective optical paths, reducing the generation of stray light and ghost images. Adding auxiliary supports between the spacer element 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.

[0077] In some embodiments, the camera lens according to the present application may further include a filter and / or a protective glass disposed between the eighth lens and the imaging surface, for filtering light with different wavelengths, correcting color deviation, and protecting the photosensitive element located on the imaging surface.

[0078] In some embodiments, the camera lens according to the present application may further include a diaphragm disposed between the object side and the first lens. The setting of the diaphragm is beneficial to effectively converging the light entering the optical lens and is beneficial to reducing the aperture of the lens.

[0079] For the camera lens according to the above embodiment of the present application, the lens group can adopt multiple lenses, such as the eight lenses described above. By reasonably distributing the focal lengths, surface shapes, central thicknesses of the respective lenses, and the on-axis distances between the respective lenses, etc., the incident light can be effectively converged, the overall optical length can be reduced, and the processability can be improved, making the camera lens more conducive to production and processing.

[0080] In an embodiment of the present application, at least one of the lens surfaces of each of the first lens to the eighth lens is an aspherical lens 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 improving 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. In an exemplary embodiment, the object side and the image side of each of the first lens to the eighth lens are aspherical lens surfaces.

[0081] Embodiments 1 to 8 of a camera lens applicable to the above exemplary embodiments will be further described below with reference to the accompanying drawings.

[0082] Example 1

[0083] The following will be described with reference to Figure 2 a schematic structural diagram of a camera lens according to Embodiment 1 of the present application. As Figure 2 shown, the camera lens may include a lens barrel and a lens group and a spacer element group accommodated in the lens barrel.

[0084] Among them, 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 camera lens further includes a diaphragm STO located on the object side of the first lens E1.

[0085] The spacer element group sequentially includes, from the object side to the image side: 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 sixth spacer element P6, and a seventh spacer element P7. The spacer element can block stray light during the imaging process from entering the next lens, and at the same time enables the lens to better bear against the lens barrel, enhancing the structural stability of the camera lens.

[0086] In this embodiment, the first lens E1 has a positive optical power, its object side S1 is convex, and its image side S2 is concave. The second lens E2 has a negative optical power, its object side S3 is convex, and its image side S4 is concave. The third lens E3 has a negative optical power, its object side S5 is convex, and its image side S6 is concave. The fourth lens E4 has a positive optical power, its object side S7 is convex, and its image side S8 is convex. The fifth lens E5 has a positive optical power, its object side S9 is concave, and its image side S10 is convex. The sixth lens E6 has a negative optical power, its object side S11 is convex, and its image side S12 is concave. The seventh lens E7 has a positive optical power, its object side S13 is convex, and its image side S14 is concave. The eighth lens E8 has a negative optical power, its object side S15 is convex, and its image side S16 is concave. An optical element may also be provided between the eighth lens E8 and the imaging surface. The optical element may be a filter or a protective glass, etc., and it has an object side S17 and an image side S18. Light from the object sequentially passes through the surfaces S1 to S18 and finally forms an image on the imaging surface.

[0087] Table 1 shows the basic parameter table of the camera lens of Embodiment 1, where the unit of the radius of curvature and the thickness / distance is millimeter (mm).

[0088]

[0089]

[0090] Table 1

[0091] In Embodiment 1, the object side and the image side of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces. The surface shape x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0092]

[0093] Where x is the sagitta of the distance from the vertex of the aspherical surface when the aspherical surface is 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 (that is, 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. Tables 2 and 3 below give the higher-order term coefficients A4, A6, A8, A 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 and A30 。

[0094] Face number A4 A6 A8 A10 A12 A14 A16 S1 4.3134E-03 -4.6154E-03 -2.8500E-03 -8.6631E-04 -2.9498E-04 -7.0472E-05 -4.1173E-05 S2 -6.9944E-02 5.8995E-03 -2.6492E-03 -2.4862E-04 -1.9524E-04 -1.1435E-04 -2.9721E-05 S3 2.8331E-02 2.6674E-02 -1.0422E-03 9.2372E-04 -1.0004E-04 -8.4630E-05 -2.1816E-05 S4 8.8642E-02 2.0724E-02 6.4202E-04 1.1142E-03 1.7393E-04 3.4644E-05 1.4166E-05 S5 -3.1069E-01 -9.5773E-03 -1.2467E-04 1.6028E-03 4.2437E-04 1.8617E-04 6.6767E-06 S6 -4.2997E-01 2.7082E-02 7.8095E-03 4.9335E-03 9.8124E-04 4.8633E-04 -1.8567E-04 S7 -2.8083E-01 4.2940E-02 -6.2663E-03 2.1950E-03 4.0988E-04 3.7909E-04 -5.8271E-04 S8 -2.9379E-01 4.2087E-02 -6.4582E-03 2.2855E-03 7.8955E-04 -1.4834E-06 -2.6730E-04 S9 -2.1150E-01 2.3019E-02 1.6187E-03 -9.1979E-04 1.5010E-03 -3.4592E-04 9.6271E-05 S10 -3.8783E-01 -3.6903E-02 -2.5934E-03 -1.4629E-03 2.8495E-03 6.3552E-04 5.3331E-05 S11 -9.9334E-01 -6.0556E-02 1.6566E-02 1.9360E-02 3.0269E-03 1.0184E-03 -2.0251E-03 S12 -1.9019E+00 5.1453E-01 -4.8678E-02 -3.1686E-03 -2.2769E-02 9.1332E-03 2.1811E-03 S13 -6.3618E+00 1.3788E+00 -1.8457E-02 -1.7070E-01 3.4962E-02 3.6049E-02 -1.5193E-02 S14 -3.2724E+00 1.0235E-01 2.6666E-01 -1.7122E-01 7.0878E-02 -2.2355E-02 1.1092E-02 S15 -6.7949E+00 2.6655E+00 -1.1933E+00 4.9094E-01 -1.9940E-01 6.0588E-02 -1.9711E-02 S16 -1.3451E+01 3.5672E+00 -1.1009E+00 4.0208E-01 -2.0410E-01 7.9020E-02 -4.2851E-02

[0095] Table 2

[0096]

[0097]

[0098] Table 3

[0099] Figure 4A shows the axial chromatic aberration curve of the camera lens of Embodiment 1, which represents the deviation of the convergence points of light rays with different wavelengths after passing through the lens. Figure 4B shows the astigmatism curve of the camera lens of Embodiment 1, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 4C shows the distortion curve of the camera lens of Embodiment 1, which represents the distortion magnitude values corresponding to different image heights. According to Figures 4A to 4C it can be seen that the camera lens given in Embodiment 1 can achieve good imaging quality.

[0100] Example 2

[0101] Figure 3 shows a schematic structural diagram of the camera lens 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 3 shown, the camera lens of this embodiment includes a lens barrel and a lens group and a spacer element group accommodated in the lens barrel. 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 spacer element group includes, in order from the object side to the image side: 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 sixth spacer element P6, and a seventh spacer element P7.

[0103] The parameters such as the curvature radii and central thicknesses of the first lens to the eighth lens of the camera lens in this embodiment are the same as those in Embodiment 1, as well as the spacing distances between the lenses and the high-order term coefficients, as shown in Tables 1, 2, and 3. Additionally, the spacer elements included in the spacer element group of the camera lens in this embodiment are the same as those in Embodiment 1, with the difference being that at least one of the parameters such as the barrel, the thickness of the spacer element, the inner diameter of the spacer element, the outer diameter of the spacer element, and the spacing distance between the spacer elements is different. Or rather, the main structures for imaging are the same, while the auxiliary structures for imaging are different. Therefore, the imaging quality of the camera lens in this embodiment is as Figures 4A to 4C shown.

[0104] Example 3

[0105] Refer to the following Figure 5 for a schematic structural diagram of the camera lens according to Embodiment 3 of the present application. As Figure 5 shown, the camera lens may include a barrel and a lens group and a spacer element group accommodated in the barrel.

[0106] Among them, 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 camera lens further includes a diaphragm STO located on the object side of the first lens E1.

[0107] The spacer element group sequentially includes, from the object side to the image side: 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 sixth spacer element P6, and a seventh spacer element P7. The spacer element can block stray light during the imaging process from entering the next lens, and at the same time enables the lens to better bear against the barrel, enhancing the structural stability of the camera lens.

[0108] In this embodiment, the first lens E1 has a positive optical power. Its object side S1 is convex, and its image side S2 is concave. The second lens E2 has a negative optical power. Its object side S3 is convex, and its image side S4 is concave. The third lens E3 has a negative optical power. Its object side S5 is convex, and its image side S6 is concave. The fourth lens E4 has a positive optical power. Its object side S7 is convex, and its image side S8 is convex. The fifth lens E5 has a positive optical power. Its object side S9 is concave, and its image side S10 is convex. The sixth lens E6 has a negative optical power. Its object side S11 is convex, and its image side S12 is concave. The seventh lens E7 has a positive optical power. Its object side S13 is convex, and its image side S14 is concave. The eighth lens E8 has a negative optical power. Its object side S15 is convex, and its image side S16 is concave. An optical element may also be provided between the eighth lens E8 and the imaging surface. The optical element may be a filter or a protective glass, etc., which has an object side S17 and an image side S18. Light from the object sequentially passes through the surfaces S1 to S18 and finally forms an image on the imaging surface.

[0109] Table 4 shows the basic parameter table of the camera lens in Embodiment 3, where the unit of the radius of curvature and the thickness / distance is millimeter (mm).

[0110]

[0111] Table 4

[0112] In Embodiment 3, the object side and the image side of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces. The surface shape x of each aspherical lens can be defined by, but not limited to, the aspherical formula (1) in Embodiment 1.

[0113] The following Tables 5 and 6 give the higher-order term coefficients A4, A6, A8, A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 for the aspherical mirror surfaces S1 - S16 in Embodiment 3.

[0114] Face number A4 A6 A8 A10 A12 A14 A16 S1 7.4407E-03 -3.5322E-03 -2.6850E-03 -7.6199E-04 -2.9213E-04 -4.9673E-05 -4.2142E-05 S2 -7.4148E-02 6.5575E-03 -2.4467E-03 -2.6376E-04 -1.7214E-04 -1.0342E-04 -2.0758E-05 S3 2.5974E-02 2.8757E-02 -9.5189E-04 9.6758E-04 -5.5449E-05 -7.3242E-05 -1.0046E-05 S4 8.9927E-02 2.1727E-02 4.1798E-04 1.1167E-03 1.9169E-04 4.2103E-05 2.6921E-05 S5 -3.3862E-01 -1.2149E-02 2.3118E-04 1.7795E-03 4.5726E-04 1.6300E-04 -8.6581E-06 S6 -4.6209E-01 2.8248E-02 8.9234E-03 5.2260E-03 1.0082E-03 3.4837E-04 -3.0184E-04 S7 -2.9376E-01 4.3749E-02 -7.2895E-03 2.1223E-03 9.7249E-04 4.2104E-04 -5.8222E-04 S8 -3.0470E-01 4.1769E-02 -6.5682E-03 2.4212E-03 2.5429E-03 8.8534E-04 1.1948E-04 S9 -2.1620E-01 2.5640E-02 2.7780E-03 -1.9301E-03 2.4323E-03 2.2083E-04 3.3510E-04 S10 -3.9899E-01 -3.9544E-02 -9.8207E-04 -2.9481E-03 1.9820E-03 4.5717E-04 1.0178E-04 S11 -1.0982E+00 -4.7538E-02 2.5259E-03 2.1779E-02 1.0073E-03 3.4688E-03 -1.2430E-03 S12 -2.3525E+00 5.8109E-01 -6.3903E-02 1.6476E-02 -2.8760E-02 8.9167E-03 8.0410E-04 S13 -6.2550E+00 1.1185E+00 9.5175E-02 -1.3311E-01 -1.0393E-02 3.1907E-02 -1.6639E-03 S14 -2.4664E+00 -6.0365E-02 3.4159E-01 -2.0247E-01 8.1894E-02 -2.4544E-02 1.2421E-02 S15 -7.6464E+00 2.8603E+00 -1.2228E+00 4.9151E-01 -1.8108E-01 5.3768E-02 -1.4135E-02 S16 -1.4449E+01 3.6092E+00 -1.0892E+00 4.3346E-01 -1.9848E-01 7.8148E-02 -4.5132E-02

[0115] Table 5

[0116] Face number A18 A20 A22 A24 A26 A28 A30 S1 1.3573E-06 -8.8649E-06 3.8981E-06 -5.0139E-06 2.0349E-06 -2.9319E-06 1.8619E-06 S2 -8.3315E-06 4.5450E-06 2.4227E-06 3.8634E-06 4.6407E-07 0.0000E+00 0.0000E+00 S3 -1.5211E-05 -2.4678E-06 -9.3131E-07 2.5056E-06 2.2351E-06 2.4769E-06 1.1822E-06 S4 6.7706E-06 5.1681E-06 2.3112E-06 4.7813E-07 -9.8395E-07 -9.3704E-07 -1.1930E-06 S5 6.4593E-06 1.0039E-06 4.2685E-06 3.2134E-06 3.1486E-06 -2.2630E-07 -1.4036E-06 S6 2.6800E-06 8.0648E-05 4.2910E-05 9.3547E-06 -3.3370E-06 -3.3374E-06 -6.6927E-06 S7 4.1857E-06 8.2037E-05 -5.2257E-06 -1.2642E-05 -4.3507E-06 -2.0209E-06 -6.4697E-06 S8 -1.1340E-04 -2.9585E-04 -2.1262E-05 9.8414E-06 -1.0602E-05 -5.5526E-07 -9.1943E-06 S9 -1.5543E-04 -3.7145E-04 9.1151E-05 5.2300E-05 1.7244E-06 -4.3885E-06 -1.4580E-05 S10 8.0285E-05 -1.9229E-04 -7.0152E-05 -1.0628E-05 2.1221E-05 2.1877E-05 9.5889E-06 S11 -7.4904E-04 -8.9142E-04 -2.4634E-04 -3.2212E-05 7.7519E-05 4.9692E-05 3.6191E-05 S12 5.6385E-04 -1.0133E-03 6.6795E-05 4.7096E-05 5.6551E-05 -2.9113E-05 1.9570E-05 S13 -6.2780E-03 1.1429E-05 2.1500E-03 -6.9174E-04 -3.7116E-05 4.1739E-05 -1.0091E-05 S14 -1.0341E-02 2.8429E-03 5.9920E-04 1.1998E-05 7.8349E-05 -2.4216E-04 1.4664E-04 S15 2.6537E-03 -1.7565E-03 2.8318E-03 -2.8427E-03 1.6910E-03 -5.1547E-04 4.6983E-05 S16 2.6537E-02 -9.6438E-03 3.7502E-03 -4.2361E-03 3.1956E-03 -1.1020E-03 1.3307E-04

[0117] Table 6

[0118] Figure 7A The axial chromatic aberration curve of the camera lens of Embodiment 3 is shown, which represents the deviation of the focusing points of light rays with different wavelengths after passing through the lens. Figure 7B The astigmatism curve of the camera lens of Embodiment 3 is shown, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 7C The distortion curve of the camera lens of Embodiment 3 is shown, which represents the distortion magnitude values corresponding to different image heights. According to Figures 7A to 7C it can be known that the camera lens given in Embodiment 3 can achieve good imaging quality.

[0119] Example 4

[0120] Figure 6 The structural schematic diagram of the camera lens according to Embodiment 4 of the present application is shown.

[0121] As Figure 6 shown, the camera lens of this embodiment includes a lens barrel and a lens group and a spacer element group accommodated in the lens barrel. 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 spacer element group includes, in order from the object side to the image side: 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 sixth spacer element P6, and a seventh spacer element P7.

[0122] The parameters such as the radius of curvature and the central thickness of the first lens to the seventh lens of the camera lens of this embodiment and the camera lens of Embodiment 3, as well as the spacing distance and the high-order term coefficients between the lenses are the same, as shown in Tables 4, 5, and 6. In addition, the spacer elements included in the spacer element group of the camera lens of this embodiment and the camera lens of Embodiment 3 are also the same. The difference is only that at least one of the parameters such as the lens barrel, the thickness of the spacer element, the inner diameter of the spacer element, the outer diameter of the spacer element, and the distance between the spacer elements is different. Or rather, the main structures for imaging are the same, while the auxiliary structures for imaging are different. Therefore, the imaging quality of the camera lens of this embodiment is as Figures 7A to 7C shown.

[0123] Example 5

[0124] The following refers to Figure 8 to describe the structural schematic diagram of the camera lens according to Embodiment 5 of the present application. As Figure 8 shown, the camera lens may include a lens barrel and a lens group and a spacer element group accommodated in the lens barrel.

[0125] Among them, 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 imaging lens further includes a diaphragm STO located on the object side of the first lens E1.

[0126] The spacer element group sequentially includes, from the object side to the image side: 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 sixth spacer element P6, and a seventh spacer element P7. The spacer elements can block stray light during the imaging process from entering the next lens, and at the same time enable the lens to better rest against the lens barrel, enhancing the structural stability of the imaging lens.

[0127] In this embodiment, the first lens E1 has a positive focal power, its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has a negative focal power, its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has a negative focal power, its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has a positive focal power, its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has a negative focal power, its object side surface S9 is concave, and its image side surface S10 is convex. The sixth lens E6 has a negative focal power, its object side surface S11 is convex, and its image side surface S12 is concave. The seventh lens E7 has a positive focal power, its object side surface S13 is convex, and its image side surface S14 is concave. The eighth lens E8 has a negative focal power, its object side surface S15 is convex, and its image side surface S16 is concave. An optical element may also be provided between the eighth lens E8 and the imaging surface, and the optical element may be a filter or a protective glass, etc., which has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through the surfaces S1 to S18 and finally forms an image on the imaging surface.

[0128] Table 7 shows the basic parameter table of the imaging lens of Embodiment 5, where the units of the radius of curvature and the thickness / distance are both millimeters (mm).

[0129]

[0130] Table 7

[0131] In Embodiment 5, the object side surface and the image side surface of any one of the first lens E1 to the eighth lens E8 are both aspherical surfaces, and the surface profile x of each aspherical lens can be defined by, but not limited to, the aspherical formula (1) in Embodiment 1.

[0132] The following Table 8 and Table 9 give the high-order term coefficients A4, A6, A8, A 10 , A 12 , A 14 , A16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0133]

[0134]

[0135] Table 8

[0136] Face number A18 A20 A22 A24 A26 A28 A30 S1 -3.8288E-06 -6.3976E-07 6.4226E-06 1.8261E-06 8.8243E-06 4.6616E-06 5.4377E-06 S2 3.5400E-07 1.4863E-06 1.8029E-06 -1.8260E-06 -2.1099E-06 0.0000E+00 0.0000E+00 S3 -9.1751E-06 2.7591E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 -7.7108E-08 3.3172E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 9.0016E-06 5.9772E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 5.1791E-05 7.9869E-05 8.3704E-06 -1.3438E-06 -1.0562E-06 -5.1388E-06 -5.9279E-06 S7 -3.8780E-04 -3.0462E-04 -3.0119E-04 -1.7345E-04 -8.5369E-05 -5.2805E-05 -1.9476E-05 S8 -5.6383E-05 -3.2065E-04 1.1521E-05 -1.4739E-04 -8.8940E-06 -3.3118E-05 -1.0716E-05 S9 -2.8616E-05 -3.3559E-04 1.7208E-04 -1.2353E-04 5.3711E-05 -2.9640E-05 6.9364E-06 S10 4.5761E-04 -8.3884E-05 7.9755E-05 -3.2381E-05 1.4702E-05 -3.6809E-06 4.4569E-06 S11 -8.0239E-04 -1.0439E-03 -2.2248E-04 1.3027E-05 1.3676E-04 8.3508E-05 4.3826E-05 S12 1.2677E-04 -8.5489E-04 2.0466E-04 7.1671E-05 -1.1116E-06 -4.2854E-05 2.2812E-05 S13 -7.5958E-03 2.5075E-03 2.2012E-03 -1.3581E-03 -3.6352E-05 2.6252E-04 1.1175E-05 S14 -9.7790E-03 3.4152E-03 1.2997E-03 -7.9187E-04 -3.2542E-04 -3.5808E-04 2.0859E-04 S15 4.7287E-03 -8.4536E-04 1.4402E-03 -1.9075E-03 1.2768E-03 -7.4469E-04 -2.5670E-05 S16 3.0313E-02 -1.2886E-02 5.4343E-03 -2.1006E-03 2.7674E-03 -1.8096E-03 1.5787E-04

[0137] Table 9

[0138] Figure 10A shows the axial chromatic aberration curve of the camera lens of Example 5, which represents the deviation of the focusing points of light rays with different wavelengths after passing through the lens. Figure 10B shows the astigmatism curve of the camera lens of Example 5, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 10C shows the distortion curve of the camera lens of Example 5, which represents the distortion magnitude values corresponding to different image heights. According to Figures 10A to 10C , it can be known that the camera lens given in Example 5 can achieve good imaging quality.

[0139] Example 6

[0140] Figure 9 shows a schematic structural diagram of the camera lens according to Embodiment 6 of the present application.

[0141] As Figure 9 shown, the camera lens of this embodiment includes a lens barrel and a lens group and a spacer element group accommodated in the lens barrel. 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 spacer element group includes, in order from the object side to the image side: 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 sixth spacer element P6, and a seventh spacer element P7.

[0142] The parameters such as the radius of curvature and the central thickness of the first lens to the seventh lens of the camera lens in this embodiment are the same as those in Embodiment 5, as well as the spacing distance between the lenses and the high-order term coefficients, as shown in Tables 7, 8, and 9. In addition, the spacer elements included in the spacer element group of the camera lens in this embodiment are the same as those in Embodiment 5, and the difference is only that at least one of the parameters such as the barrel, the thickness of the spacer element, the inner diameter of the spacer element, the outer diameter of the spacer element, and the distance between the spacer elements is different. Or rather, the main structure for imaging is the same, while the auxiliary structure for imaging is different. Therefore, the imaging quality of the camera lens in this embodiment is as Figures 10A to 10C shown.

[0143] Example 7

[0144] The following refers to Figure 11 the structural schematic diagram of the camera lens according to Embodiment 7 of the present application. As Figure 11 shown, the camera lens may include a barrel and a lens group and a spacer element group accommodated in the barrel.

[0145] Among them, 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 camera lens further includes a diaphragm STO located on the object side of the first lens E1.

[0146] The spacer element group sequentially includes, from the object side to the image side: 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 sixth spacer element P6, and a seventh spacer element P7. The spacer element can block stray light during the imaging process from entering the next lens, and at the same time enables the lens to better bear against the barrel, enhancing the structural stability of the camera lens.

[0147] In this embodiment, the first lens E1 has a positive optical power. Its object side S1 is convex, and its image side S2 is concave. The second lens E2 has a negative optical power. Its object side S3 is convex, and its image side S4 is concave. The third lens E3 has a negative optical power. Its object side S5 is convex, and its image side S6 is concave. The fourth lens E4 has a positive optical power. Its object side S7 is convex, and its image side S8 is convex. The fifth lens E5 has a positive optical power. Its object side S9 is convex, and its image side S10 is convex. The sixth lens E6 has a negative optical power. Its object side S11 is convex, and its image side S12 is concave. The seventh lens E7 has a positive optical power. Its object side S13 is convex, and its image side S14 is concave. The eighth lens E8 has a negative optical power. Its object side S15 is convex, and its image side S16 is concave. An optical element may also be provided between the eighth lens E8 and the imaging surface. The optical element may be a filter or a protective glass, etc., and it has an object side S17 and an image side S18. Light from the object sequentially passes through the surfaces S1 to S18 and finally forms an image on the imaging surface.

[0148] Table 10 shows the basic parameter table of the camera lens in Embodiment 7, where the units of the radius of curvature and the thickness / distance are both millimeters (mm).

[0149]

[0150]

[0151] Table 10

[0152] In Embodiment 7, the object side and the image side of any one of the first lens E1 to the eighth lens E8 are both aspherical surfaces. The surface shape x of each aspherical lens can be defined by, but not limited to, the aspherical formula (1) in Embodiment 1.

[0153] The following Tables 11 and 12 give the higher-order term coefficients A4, A6, A8, A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 that can be used for the aspherical surfaces S1 - S16 in Embodiment 7.

[0154] Face number A4 A6 A8 A10 A12 A14 A16 S1 6.7463E-03 -3.8035E-03 -2.4834E-03 -7.9786E-04 -2.3607E-04 -5.7068E-05 -2.0110E-05 S2 -7.9967E-02 7.4265E-03 -2.6203E-03 -4.8565E-05 -1.5750E-04 -1.0107E-04 -3.8012E-05 S3 -3.6370E-04 2.9937E-02 -5.0199E-04 1.3476E-03 5.4688E-05 -4.8018E-05 -1.3279E-05 S4 4.5895E-02 1.6356E-02 -1.8060E-04 8.8667E-04 1.8643E-04 4.2244E-05 2.3198E-05 S5 -2.5189E-01 -1.2046E-02 3.6723E-05 9.9543E-04 1.3590E-04 5.3324E-05 -1.3043E-05 S6 -3.6350E-01 1.7686E-02 4.8060E-03 4.0461E-03 3.7797E-04 -2.1200E-04 -2.6421E-04 S7 -2.2262E-01 4.3461E-02 -8.0496E-03 4.4912E-03 1.3805E-03 -1.6020E-04 -1.7930E-04 S8 -2.5727E-01 3.3982E-02 -5.1789E-03 3.6924E-03 5.7313E-03 1.1378E-03 8.8277E-04 S9 -1.6456E-01 3.9695E-02 1.2235E-02 -3.6426E-03 5.1215E-03 -1.3052E-03 5.0594E-04 S10 -2.6310E-01 -1.3797E-02 2.1391E-02 -2.6776E-03 2.3698E-03 -1.4758E-04 4.0187E-04 S11 -9.3982E-01 -4.2027E-02 -7.1754E-04 1.8026E-02 3.5801E-03 2.1103E-03 -6.0402E-04 S12 -1.8708E+00 4.8158E-01 -5.3233E-02 6.7928E-03 -1.7281E-02 5.1575E-03 2.0183E-03 S13 -5.7489E+00 1.0918E+00 6.4854E-02 -1.4120E-01 1.0300E-02 2.7035E-02 -3.8455E-03 S14 -2.5033E+00 -1.3411E-02 3.1336E-01 -1.7827E-01 7.6637E-02 -2.2288E-02 9.4878E-03 S15 -7.4167E+00 2.7474E+00 -1.1869E+00 4.7313E-01 -1.7768E-01 5.0751E-02 -1.5768E-02 S16 -1.3844E+01 3.5481E+00 -1.0977E+00 4.2041E-01 -2.0217E-01 7.8327E-02 -4.6664E-02

[0155] Table 11

[0156]

[0157]

[0158] Table 12

[0159] Figure 13A shows the axial chromatic aberration curve of the camera lens of Embodiment 7, which represents the deviation of the focus points of light rays with different wavelengths after passing through the lens. Figure 13B shows the astigmatism curve of the camera lens of Embodiment 7, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 13C shows the distortion curve of the camera lens of Embodiment 7, which represents the distortion magnitude values corresponding to different image heights. According to Figures 13A to 13C it can be known that the camera lens given in Embodiment 7 can achieve good imaging quality.

[0160] Example 8

[0161] Figure 12 shows a schematic structural diagram of the camera lens according to Embodiment 8 of the present application.

[0162] As Figure 12 shown, the camera lens of this embodiment includes a lens barrel and a lens group and a spacer element group accommodated in the lens barrel. 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 spacer element group includes, in order from the object side to the image side: 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 sixth spacer element P6, and a seventh spacer element P7.

[0163] The parameters such as the radius of curvature and the central thickness of the first lens to the seventh lens of the camera lens of this embodiment and the camera lens of Embodiment 7, as well as the spacing distance and the high-order term coefficients between the lenses are the same, as shown in Table 10, Table 11, and Table 12. In addition, the spacer elements included in the spacer element group of the camera lens of this embodiment and the camera lens of Embodiment 7 are also the same. The difference is only that at least one of the parameters such as the lens barrel, the thickness of the spacer element, the inner diameter of the spacer element, the outer diameter of the spacer element, and the distance between the spacer elements is different. Or rather, the main structures for imaging are the same, while the auxiliary structures for imaging are different. Therefore, the imaging quality of the camera lens of this embodiment is as Figures 13A to 13C shown.

[0164] The following Table 13 shows the effective focal lengths of the camera lenses of Embodiments 1 to 8, the focal length values of each lens, and parameter values such as SAG22 and SAG71. The unit of each parameter value is millimeter (mm).

[0165]

[0166]

[0167] Table 13

[0168] Table 14 below shows some basic parameters of the lens barrel and spacer elements of the camera lens according to Embodiments 1 to 8 of the present application, such as d1s, d1m, D1s, D1m, d2s, D2s, ……, d0s, D0m, CP3, CP4, CP6, EP12, EP23, EP34, EP45, EP56, EP67, etc. Some of the basic parameters listed in Table 14 are measured according to the Figure 1 annotation method shown, and the units of the basic parameters listed in Table 14 are all millimeters (mm).

[0169] Parameter value / Example 1 2 3 4 5 6 7 8 d1s (mm) 4.425 4.425 4.891 4.920 4.296 4.351 4.489 4.489 d1m (mm) 4.425 4.425 4.891 4.920 4.296 4.351 4.489 4.489 D1s (mm) 6.614 6.652 7.080 7.355 6.486 6.390 6.678 6.759 D1m (mm) 6.614 6.652 7.080 7.355 6.486 6.390 6.678 6.759 d2s (mm) 4.114 4.114 4.367 4.367 4.025 4.025 3.986 3.986 D2s (mm) 8.400 8.362 8.866 8.827 8.272 8.195 8.464 8.501 d3s (mm) 4.743 4.743 5.007 5.007 4.594 4.594 4.586 4.586 D5m (mm) 9.600 10.189 10.058 10.361 9.463 9.261 9.656 10.036 D6m (mm) 13.034 12.946 13.870 14.186 13.291 13.247 12.214 12.781 D7m (mm) 15.100 14.589 15.918 16.119 15.324 15.324 15.525 15.051 d0s (mm) 6.708 6.708 7.174 7.174 6.500 6.500 6.710 6.710 d0m (mm) 17.105 17.105 18.878 18.878 17.469 17.469 17.679 17.679 D0m (mm) 18.031 18.031 19.804 19.804 19.130 19.130 19.340 19.340 CP3 (mm) 0.019 0.020 0.019 0.022 0.019 0.020 0.019 0.022 CP4 (mm) 0.019 0.022 0.019 0.022 0.019 0.022 0.020 0.020 CP5 (mm) 0.022 0.022 0.022 0.022 0.022 0.022 0.022 0.022 CP6 (mm) 0.687 0.691 0.687 0.687 0.680 0.701 0.777 0.777 EP12 (mm) 0.777 0.774 0.902 0.902 0.709 0.709 0.709 0.709 EP23 (mm) 0.482 0.481 0.482 0.482 0.482 0.482 0.482 0.482 EP34 (mm) 0.310 0.329 0.392 0.388 0.392 0.390 0.391 0.389 EP45 (mm) 0.461 0.458 0.461 0.460 0.461 0.459 0.538 0.538 EP56 (mm) 0.874 0.874 1.075 1.080 1.075 1.075 0.773 0.773 EP67 (mm) 1.060 0.678 1.254 1.280 1.261 1.261 1.075 0.599

[0170] Table 14 In summary, the camera lenses in Embodiments 1 to 8 respectively satisfy the conditional expressions in Table 15 below.

[0171] Condition / Example 1 2 3 4 5 6 7 8 T23 / (EP23 + T34) 1.13 1.13 1.25 1.25 1.22 1.22 1.23 1.23 T56 / (T45 + EP45) 1.67 1.68 1.72 1.72 1.41 1.41 1.18 1.18 R4 * D2s / (D1s * R2) 0.88 0.87 0.92 0.89 0.85 0.86 0.87 0.87 R1 / (D1m - d1m) 1.59 1.57 1.76 1.58 1.61 1.73 1.62 1.56 EP12 / SAG22 2.13 2.13 2.53 2.53 2.23 2.23 2.27 2.27 (T34 + T45) / (CP3 + CP4) 4.96 4.48 5.92 5.92 3.94 3.94 4.65 4.65 CP6 / |SAG71| 1.38 1.39 1.48 1.48 2.48 2.56 2.35 2.35 (D6m - D5m) / (D7m - D6m) 1.66 1.68 1.86 1.98 1.88 1.92 0.77 1.21 f78 / EP67 32.06 50.08 16.58 16.23 13.22 13.22 21.94 39.36 f8 * N8 / (D0m - d0m) -13.97 -13.97 -15.31 -15.31 -7.72 -7.72 -7.94 -7.94 (d0m - d0s) / f 1.21 1.21 1.24 1.24 1.34 1.34 1.28 1.28 R1 * N1 / (D1s - d1s) 2.46 2.42 2.72 2.45 2.49 2.67 2.50 2.41 (R3 * d1m) / (R4 * d2s) 2.33 2.33 2.35 2.37 1.99 2.02 2.18 2.18 (R5 / R6) * f3 / d3s -15.76 -15.76 -16.76 -16.76 -14.87 -14.87 -19.53 -19.53 f4 / EP34 157.15 148.07 104.33 104.33 66.76 66.76 116.81 116.81 f56 / (EP56 + CP5) -60.89 -60.89 -25.91 -25.80 -18.62 -18.62 -48.26 -48.26

[0172] Table 15

[0173] Table 16 below shows the comparison of the solutions of Sample 1, Sample 2, and Sample 3 of the camera lens. Among them, the camera lens of Sample 1 (comparative example) satisfies (R5 / R6)*f3 / d3s = -21.3, (f4 / EP34) = 64.6; the camera lens of Sample 2 (comparative example) satisfies (R5 / R6)*f3 / d3s = -13.8, (f4 / EP34) = 158.1; the camera lens of Sample 3 (the present application) satisfies (R5 / R6)*f3 / d3s = -15.76, (f4 / EP34) = 157.15.

[0174] Combined with Figure 14 、 Figure 15 and Figure 16 the above-mentioned spot diagrams of stray light of Sample 1, Sample 2, and Sample 3 shown, it can be seen that Figure 14 and Figure 15 for Sample 1 and Sample 2 of the camera lens according to the prior art shown, the stray light energy is strong and the optical performance of the camera lens is unqualified; while Figure 16The stray light energy of the shown sample 3 is significantly weakened. Therefore, the camera lens according to the present application can achieve a good effect of eliminating stray light, and the optical performance of the camera lens is qualified. Through the experimental comparison of different samples of the camera lens, it can be found that by optimizing the design of the optical system structure, the camera lens meets the numerical ranges of the conditional expressions -19.55 < (R5 / R6)*f3 / d3s < -14.85 and 66.75 < f4 / EP34 < 157.2. Compared with sample 2 and sample 3 outside the numerical ranges of the conditional expressions, the light spot is significantly weakened and the stray light improvement effect is better.

[0175]

[0176]

[0177] Table 16

[0178] The above description is only the preferred embodiment of the present application and the explanation of the applied technical principles. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, and 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 the mutual replacement of the above features and the technical features (but not limited to) with similar functions disclosed in the present application.

Claims

1. A camera lens, characterized in that: The lens barrel comprises a lens group and a spacer element group contained in the lens barrel. The lens group includes eight lenses with optical power, which include, 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; The spacer element group includes at least a third spacer element and a fourth spacer element, the third spacer element is disposed between the third lens and the fourth lens and is in at least partial contact with the image side surface of the third lens, and the fourth spacer element is disposed between the fourth lens and the fifth lens and is in at least partial contact with the image side surface of the fourth lens; The curvature radius R5 of the object side surface of the third lens, the curvature radius R6 of the image side surface of the third lens, the effective focal length f3 of the third lens, and the inner diameter d3s of the object side surface of the third spacing element satisfy: -19.55<(R5 / R6)*f3 / d3s<-14.85; The effective focal length f4 of the fourth lens and the interval EP34 between the third spacing element and the fourth spacing element satisfy: 66.75<f4 / EP34<157.

2.

2. The 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 in contact with the image side surface of the second lens, The air gap T23 between the second lens and the third lens on the optical axis, the air gap T34 between the third lens and the fourth lens on the optical axis, and the gap EP23 between the second spacing element and the third spacing element satisfy: 1.1<T23 / (EP23+T34)<1.

3.

3. The imaging lens according to claim 1, wherein: The spacer element group further includes a fifth spacer element disposed between the fifth lens and the sixth lens and at least partially in contact with the image side surface of the fifth lens. An air interval T45 between the fourth lens and the fifth lens on the optical axis, an air interval T56 between the fifth lens and the sixth lens on the optical axis, and an interval EP45 between the fourth spacing element and the fifth spacing element satisfy: 1.18≤T56 / (T45+EP45)≤1.

72.

4. The 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 in contact with the image side surface of the first lens, and 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 curvature radius R2 of the image side surface of the first lens, the curvature radius R4 of the image side surface of the second lens, the outer diameter D1s of the object side surface of the first spacer element, and the outer diameter D2s of the object side surface of the second spacer element satisfy: 0.8<R4*D2s / (D1s*R2)≤0.

92.

5. The 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 in contact with the image side surface of the first lens, The curvature radius R1 of the object side surface of the first lens, the outer diameter D1m of the image side surface of the first spacer element, and the inner diameter d1m of the image side surface of the first spacer element satisfy: 1.56≤R1 / (D1m-d1m)<1.

8.

6. The 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 in contact with the image side surface of the first lens, and 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 interval EP12 between the first spacing element and the second spacing element and the on-axis distance SAG22 from the intersection of the image side surface of the second lens and the optical axis to the vertex of the effective radius of the image side surface of the second lens satisfy: 2.1<EP12 / SAG22≤2.

53.

7. The imaging lens according to claim 1, wherein: The air gap T34 between the third lens and the fourth lens on the optical axis, the air gap T45 between the fourth lens and the fifth lens on the optical axis, the maximum thickness CP3 of the third spacing element and the maximum thickness CP4 of the fourth spacing element satisfy: 3.9<(T34+T45) / (CP3+CP4)≤5.

92.

8. The imaging lens according to claim 1, wherein: The spacer element group further includes a sixth spacer element disposed between the sixth lens and the seventh lens and at least partially in contact with the image side surface of the sixth lens. The maximum thickness CP6 of the sixth spacer element and the on-axis distance SAG71 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 satisfy: 1.35<CP6 / |SAG71|<2.

6.

9. The imaging lens according to claim 1, wherein: The spacer element group further includes a fifth spacer element disposed between the fifth lens and the sixth lens and at least partially in contact with the image side surface of the fifth lens, a sixth spacer element disposed between the sixth lens and the seventh lens and at least partially in contact with the image side surface of the sixth lens, and 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 outer diameter D5m of the image side surface of the fifth spacer element, the outer diameter D6m of the image side surface of the sixth spacer element, and the outer diameter D7m of the image side surface of the seventh spacer element satisfy: 0.75<(D6m-D5m) / (D7m-D6m)<2.

0.

10. The imaging lens according to claim 1, wherein: The spacer element group further includes a sixth spacer element disposed between the sixth lens and the seventh lens and at least partially in contact with the image side surface of the sixth lens, and 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 combined focal length f78 of the seventh lens and the eighth lens and the interval EP67 between the sixth spacing element and the seventh spacing element satisfy: 13.2<f78 / EP67<50.

1.

11. The imaging lens according to claim 1, wherein: The effective focal length f8 of the eighth lens, the refractive index N8 of the eighth lens, the outer diameter D0m of the rear end surface of the lens barrel closest to the image side, and the inner diameter d0m of the rear end surface of the lens barrel closest to the image side satisfy: -15.35<f8*N8 / (D0m-d0m)<-7.

7.

12. The imaging lens according to claim 1, wherein: The inner diameter d0s of the front end surface of the lens barrel closest to the object side, the inner diameter d0m of the rear end surface of the lens barrel closest to the image side, and the effective focal length f of the camera lens satisfy: 1.2<(d0m-d0s) / f≤1.

34.

13. The 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 in contact with the image side surface of the first lens, The curvature radius R1 of the object side surface of the first lens, the refractive index N1 of the first lens, the outer diameter D1s of the object side surface of the first spacer element, and the inner diameter d1s of the object side surface of the first spacer element satisfy: 2.4<R1*N1 / (D1s-d1s)≤2.

72.

14. The 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 in contact with the image side surface of the first lens, and 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 curvature radius R3 of the object side surface of the second lens, the curvature radius R4 of the image side surface of the second lens, the inner diameter d1m of the image side surface of the first spacer element, and the inner diameter d2s of the object side surface of the second spacer element satisfy: 1.95<(R3*d1m) / (R4*d2s)<2.

4.

15. The imaging lens according to claim 1, wherein: The spacer element group further includes a fifth spacer element disposed between the fifth lens and the sixth lens and at least partially in contact with the image side surface of the fifth lens, and a sixth spacer element disposed between the sixth lens and the seventh lens and at least partially in contact with the image side surface of the sixth lens. The combined focal length f56 of the fifth lens and the sixth lens, the interval EP56 between the fifth spacer element and the sixth spacer element, and the maximum thickness CP5 of the fifth spacer element satisfy: -60.9<f56 / (EP56+CP5)<-18.

6.

16. The imaging lens according to claim 1, wherein: The first lens has positive refractive power, its object side surface is convex, and its image side surface is concave; The second lens has negative optical power, and its object side surface is convex and its image side surface is concave; The third lens has negative optical power, its object side surface is convex, and its image side surface is concave; The fourth lens has positive refractive power, and both the object side surface and the image side surface thereof are convex; The fifth lens has positive or negative optical power, and its image side surface is convex; The sixth lens has negative optical power, its object side surface is convex, and its image side surface is concave; The seventh lens has positive refractive power, its object side surface is convex, and its image side surface is concave; The eighth lens has negative optical power, an object-side surface is convex, and an image-side surface is concave.

Images