Imaging lens

Abstract

The application discloses an imaging lens, comprising a lens barrel, a lens set and at least one spacer element, the lens set comprising first to eighth lenses arranged in order from the object side to the image side along the optical axis; the second and third lenses have a second spacer element therebetween, the third and fourth lenses have a third spacer element therebetween, the sixth and seventh lenses have a sixth spacer element therebetween, and the seventh and eighth lenses have a seventh spacer element therebetween. The maximum height L of the lens barrel and half of the diagonal length of the effective pixel area on the imaging surface ImgH satisfy 1.0L / ImgH<1.3; the effective focal length f3 of the third lens and the curvature radius R5 of the object side surface thereof satisfy -27.5f3 / R5<-8.5; the on-axis distance SAG31 from the intersection of the object side surface of the third lens and the optical axis to the effective radius vertex of the object side surface of the third lens, the air separation T23 of the second and third lenses on the optical axis, the distance EP23 of the second and third spacer elements on the optical axis, and the maximum thickness CP2 of the second spacer element satisfy -0.5<(SAG31+T23) / (EP23+CP2)<0.1.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical elements, and more particularly, to an imaging lens. BACKGROUND

[0002] With the continuous upgrading and development of consumer electronics such as mobile phones, people's requirements for the shooting of electronic products are constantly improving. Nowadays, more and more consumers are chasing the selfie effect of mobile phones, but the small head part of the lens itself is limited by the shape of the lens barrel, so that the mechanism part of the lens is small, which makes it the most difficult to improve stray light in various lenses. For example, the small height of the lens barrel is easy to cause the light to hit the front end of the lens barrel and directly reflect to produce stray light; for another example, the overall structure of the lens is easy to cause the appearance of the weld mark stray light and other situations; in addition, the lens group is easy to appear during the process of the lens group, which is caused by the too large gap and the risk of assembly, which also seriously affects the performance of the lens; and the transition stage of the large section difference of the lens adopts the metal spacer, which causes the reflection of the infrared filter (IR filter) in the lens to the metal spacer to produce reflection stray light, which is also a big problem in the process of improving the stray light of the lens. Therefore, how to meet the design requirements of miniaturization while avoiding or reducing the generation of stray light as much as possible to ensure that the lens has good imaging quality is one of the technical problems to be solved by the technical personnel in the field at present. SUMMARY

[0003] An imaging lens is provided, which can include a lens barrel, and a lens group and at least one spacer element accommodated in the lens barrel, wherein the lens group includes, in order from an object side to an image side along an 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 at least one spacer element includes: a second spacer element located between the second lens and the third lens and directly in contact with an image side surface of the second lens; a third spacer element located between the third lens and the fourth lens and directly in contact with an image side surface of the third lens; a sixth spacer element located between the sixth lens and the seventh lens and directly in contact with an image side surface of the sixth lens; and a seventh spacer element located between the seventh lens and the eighth lens and directly in contact with an image side surface of the seventh lens. A maximum height L of the lens barrel and a half of a diagonal length of an effective pixel area on an imaging surface of the imaging lens ImgH can satisfy 1.0 < L / ImgH < 1.3; an effective focal length f3 of the third lens and a radius of curvature R5 of an object side surface of the third lens can satisfy -27.5 < f3 / R5 < -8.5; and an on-axis distance SAG31 from an intersection of the object side surface of the third lens and the optical axis to an effective radius vertex of the object side surface of the third lens, an air separation T23 of the second lens and the third lens on the optical axis, a separation distance EP23 of the second spacer element and the third spacer element on the optical axis, and a maximum thickness CP2 of the second spacer element can satisfy -0.5 < (SAG31+T23) / (EP23+CP2) < 0.1.

[0004] In one embodiment, the first lens has positive refractive power, the object side surface thereof is convex, and the image side surface thereof is concave; the second lens has positive refractive power, the object side surface thereof is convex, and the image side surface thereof is concave; the third lens has positive refractive power, the object side surface thereof is concave, and the image side surface thereof is convex; the fourth lens has negative refractive power, the object side surface thereof is convex, and the image side surface thereof is concave; the fifth lens has positive refractive power, the object side surface thereof is convex, and the image side surface thereof is concave; the sixth lens has negative refractive power, the object side surface thereof is concave, and the image side surface thereof is concave; the seventh lens has positive refractive power, the object side surface thereof is convex, and the image side surface thereof is convex; and the eighth lens has negative refractive power, the object side surface thereof is concave.

[0005] In one embodiment, an outer diameter D0m of an image side end surface of the lens barrel closest to the image side and an outer diameter D0s of an object side end surface of the lens barrel closest to the object side can satisfy 1.0 < D0m-D0s < 4.0.

[0006] In one embodiment, an axial distance SAG22 from an intersection of an image side surface of the second lens and the optical axis to an effective radius vertex of the image side surface of the second lens can satisfy: -8.0 < SAG22 / CP2 < -3.0.

[0007] In one embodiment, the at least one spacer element further includes: a fifth spacer element located between the fifth lens and the sixth lens and directly contacting an image side surface of the fifth lens; and an axial distance SAG52 from an intersection of the image side surface of the fifth lens and the optical axis to an effective radius vertex of the image side surface of the fifth lens and a maximum thickness CP5 of the fifth spacer element can satisfy: 5.0 < SAG52 / CP5 < 9.5.

[0008] In one embodiment, the at least one spacer element further includes: a fourth spacer element located between the fourth lens and the fifth lens and directly contacting an image side surface of the fourth lens; and a spacer distance EP34 of the third spacer element and the fourth spacer element on the optical axis and an air separation T34 of the third lens and the fourth lens on the optical axis can satisfy: 12.0 < (EP23+EP34) / T34 < 14.5.

[0009] In one embodiment, an inner diameter d6s of an object side surface of the sixth spacer element and a radius of curvature R12 of an image side surface of the sixth lens can satisfy: 0 < d6s / R12 < 0.5.

[0010] In one embodiment, the at least one spacer element further includes: a first spacer element located between the first lens and the second lens and directly contacting an image side surface of the first lens; and an outer diameter D1s of an object side surface of the first spacer element and an inner diameter d1s of the object side surface of the first spacer element can satisfy: 0.0 < (D1s-d1s) / ImgH < 1.5.

[0011] In one embodiment, an inner diameter d0m of the image side end surface of the lens barrel closest to the image side, an outer diameter D7s of the object side surface of the seventh spacer element, an air separation T78 of the seventh lens and the eighth lens on the optical axis, and a central thickness CT8 of the eighth lens on the optical axis can satisfy: 0.5 < (d0m-D7s) / (T78-CT8) < 2.0.

[0012] In one embodiment, an inner diameter d0s of the object side end surface of the lens barrel closest to the object side, a maximum effective radius DT11 of the object side surface of the first lens, an inner diameter d0m of the image side end surface of the lens barrel closest to the image side, and a maximum effective radius DT82 of the image side surface of the eighth lens can satisfy: 4.5 < d0s / DT11+d0m / DT82 < 5.5.

[0013] In one embodiment, the effective focal length f4 of the fourth lens, the outer diameter D3m of the image side surface of the third spacer element, the inner diameter d3m of the image side surface of the third spacer element, the radius of curvature R7 of the object side surface of the fourth lens, and the maximum effective radius DT41 of the object side surface of the fourth lens can satisfy: -5.5 < f4 x (D3m - d3m) / (R7 x DT41) < -1.0.

[0014] In one embodiment, the outer diameter D2m of the image side surface of the second spacer element, the inner diameter d2m of the image side surface of the second spacer element, and the maximum effective radius DT22 of the image side surface of the second lens can satisfy: 1.5 < (D2m - d2m) / DT22 < 4.0.

[0015] In one embodiment, the at least one spacer element further comprises: a fifth spacer element located between the fifth lens and the sixth lens and directly contacting the image side surface of the fifth lens; the inner diameter d5s of the object side surface of the fifth spacer element and the radius of curvature R10 of the image side surface of the fifth lens can satisfy: 0.3 < d5s / R10 < 0.7.

[0016] In one embodiment, the at least one spacer element further comprises: a fourth spacer element located between the fourth lens and the fifth lens and directly contacting the image side surface of the fourth lens; the radius of curvature R6 of the image side surface of the third lens, the radius of curvature R7 of the object side surface of the fourth lens, and the interval distance EP34 of the third spacer element and the fourth spacer element on the optical axis can satisfy: 4.0 < (R6 + R7) / EP34 < 8.0.

[0017] The imaging lens according to the embodiment of the present application comprises a lens barrel, an eight-piece lens group accommodated in the lens barrel, and a plurality of spacer elements, wherein the first lens to the eighth lens are sequentially arranged along the optical axis from the object side to the image side, the second spacer element is arranged between the second lens and the third lens, the third spacer element is arranged between the third lens and the fourth lens, the sixth spacer element is arranged between the sixth lens and the seventh lens, and the seventh spacer element is arranged between the seventh lens and the eighth lens. Through the arrangement of the lens, and by controlling the maximum height L of the lens barrel and the half of the diagonal length of the effective pixel area on the imaging surface of the lens ImgH to satisfy 1.0 < L / ImgH < 1.3, the first stray light caused by the light hitting the front end surface of the lens barrel and directly reflecting out can be effectively prevented when the height of the lens barrel is too small. By controlling the effective focal length f3 of the third lens and the radius of curvature R5 of the object side surface of the third lens to satisfy -27.5 < f3 / R5 < -8.5, the curvature of the overall structure of the lens can be limited, so that the thickness-to-thickness ratio of the lens can be effectively ensured, and the welding mark stray light can be avoided. By controlling the axial distance SAG31 from the intersection of the object side surface of the third lens and the optical axis to the effective radius vertex of the object side surface of the third lens, the air interval T23 of the second lens and the third lens on the optical axis, the interval distance EP23 of the second spacer element and the third spacer element on the optical axis, and the maximum thickness CP2 of the second spacer element to satisfy -0.5 < (SAG31+T23) / (EP23+CP2) < 0.1, the risk of assembly caused by the too large gap change during the assembly of the lens group due to the too large thickness size and gap size of the lens mechanism part can be effectively prevented. BRIEF DESCRIPTION OF DRAWINGS

[0018] Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments, when read in conjunction with the accompanying drawings. In the drawings:

[0019] Figure 1 The structure and related parameter diagram of the imaging lens according to the exemplary embodiment of the present application are shown;

[0020] Figure 2 The structure diagram of the imaging lens according to the embodiment 1 of the present application is shown;

[0021] Figure 3 The structure diagram of the imaging lens according to the embodiment 2 of the present application is shown;

[0022] Figure 4 The structure diagram of the imaging lens according to the embodiment 3 of the present application is shown;

[0023] Figures 5 to 8 The on-axis chromatic aberration curve, the astigmatism curve, the distortion curve, and the magnification chromatic aberration curve of the imaging lens according to the embodiment 1, the embodiment 2, and the embodiment 3 of the present application are shown;

[0024] Figure 9A structural diagram of an imaging lens according to Embodiment 4 of the present application is shown.

[0025] Figure 10 A structural diagram of an imaging lens according to Embodiment 5 of the present application is shown.

[0026] Figure 11 A structural diagram of an imaging lens according to Embodiment 6 of the present application is shown.

[0027] Figures 12 to 15 On-axis chromatic aberration curves, astigmatism curves, distortion curves and lateral chromatic aberration curves of the imaging lenses according to Embodiments 4, 5 and 6 of the present application are shown.

[0028] Figure 16 A structural diagram of an imaging lens according to Embodiment 7 of the present application is shown.

[0029] Figure 17 A structural diagram of an imaging lens according to Embodiment 8 of the present application is shown.

[0030] Figure 18 A structural diagram of an imaging lens according to Embodiment 9 of the present application is shown.

[0031] Figures 19 to 22 On-axis chromatic aberration curves, astigmatism curves, distortion curves and lateral chromatic aberration curves of the imaging lenses according to Embodiments 7, 8 and 9 of the present application are shown.

[0032] Figure 23 A structural diagram of an imaging lens according to Embodiment 10 of the present application is shown.

[0033] Figure 24 A structural diagram of an imaging lens according to Embodiment 11 of the present application is shown.

[0034] Figure 25 A structural diagram of an imaging lens according to Embodiment 12 of the present application is shown; and

[0035] Figures 26 to 29 On-axis chromatic aberration curves, astigmatism curves, distortion curves and lateral chromatic aberration curves of the imaging lenses according to Embodiments 10, 11 and 12 of the present application are shown. DETAILED DESCRIPTION

[0036] For a better understanding of the present application, various aspects of the present application will be described in greater detail below with reference to the accompanying drawings. It is to be understood that the detailed description is merely descriptive of exemplary embodiments of the present application and is not intended to limit the scope of the present application in any way. Throughout the specification, like reference numerals refer to like elements. The expression “and / or” includes any and all combinations of one or more of the associated listed items.

[0037] It should be noted that the terms first, second, third, etc. are used herein only to distinguish one feature from another, and do not denote any limitation on the features. Thus, a first lens discussed below can also be referred to as a second lens or a third lens, without departing from the teachings of the present application.

[0038] In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for the sake of explanation. Specifically, the shape of the spherical or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0039] In this context, the paraxial region refers to a region near the optical axis. If a lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The judgment of the surface shape in the paraxial region can be made in accordance with a general method in the art, for example, judging convexity or concavity by the sign of the R value (R refers to the radius of curvature in the paraxial region). In this context, the surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the image plane is referred to as the image side surface of the lens. In terms of the object side surface, when the R value is positive, it is judged to be convex, and when the R value is negative, it is judged to be concave. In terms of the image side surface, when the R value is positive, it is judged to be concave, and when the R value is negative, it is judged to be convex.

[0040] It should also be understood that the words "comprise", "comprising", "include", "including", and / or "contain", when used in this specification, specify the presence of stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or groups thereof. Furthermore, as used herein, the term "and / or" means "and", "or", or both, for example, "A and / or B" means "A and B", "A or B", or both "A and B".

[0041] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an overly literal or overly formal sense unless expressly so defined herein.

[0042] It should be noted that the embodiments and features of the present application can be combined if there is no conflict. The following embodiments only express several embodiments of the present application, which are described in detail and specifically, but should not be construed as limiting the patent scope of the present application. It should be noted that for those skilled in the art, without departing from the concept of the present application, some modifications and improvements can be made, which are within the scope of protection of the present application. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0043] The features, principles and other aspects of the present application are described in detail below.

[0044] The imaging lens according to the exemplary embodiments of the present application can include a lens barrel, and a lens group and at least one spacer element accommodated in the lens barrel. The lens group can be an eight-piece lens group including, in order along an optical axis from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens.

[0045] In the exemplary embodiments, at least one spacer element in the lens can include a second spacer element located between the second lens and the third lens and directly contacting an image side surface of the second lens, a third spacer element located between the third lens and the fourth lens and directly contacting an image side surface of the third lens, a sixth spacer element located between the sixth lens and the seventh lens and directly contacting an image side surface of the sixth lens, and a seventh spacer element located between the seventh lens and the eighth lens and directly contacting an image side surface of the seventh lens.

[0046] In the exemplary embodiments, the imaging lens of the present application can satisfy a condition formula 1.0 < L / ImgH < 1.3, where L is a maximum height of the lens barrel, that is, a maximum distance on the optical axis from an object side end surface (a surface closest to the object side and perpendicular to the optical axis) of the lens barrel to an image side end surface (a surface closest to the image side and perpendicular to the optical axis) of the lens barrel, and ImgH is half of a diagonal length of an effective pixel area on an imaging surface of the lens. By controlling the ratio of the maximum height of the lens barrel to half of the diagonal length of the effective pixel area on the imaging surface of the lens to be within the range, it is possible to effectively prevent the primary stray light caused by the light hitting the object side end surface (the object side end surface) of the lens barrel and directly reflecting out.

[0047] In the exemplary embodiments, the imaging lens of the present application can satisfy a condition formula -27.5 < f3 / R5 < -8.5, where f3 is an effective focal length of the third lens, and R5 is a radius of curvature of an object side surface of the third lens. By controlling the ratio of the effective focal length of the third lens to the radius of curvature of the object side surface of the third lens to be within the range, it is possible to limit the curvature of the overall structure of the lens, thereby effectively ensuring the thickness ratio of the lens and avoiding the occurrence of the weld mark stray light.

[0048] In the example embodiment, the imaging lens of the present application can satisfy the condition -0.5 < (SAG31+T23) / (EP23+CP2) < 0.1, wherein SAG31 is the axial distance from the intersection of the object side of the third lens and the optical axis to the effective radius vertex of the object side of the third lens; T23 is the air gap on the optical axis between the second lens and the third lens, i.e., the distance on the optical axis from the image side of the second lens to the object side of the third lens; EP23 is the separation distance on the optical axis between the second spacer element and the third spacer element, i.e., the distance on the optical axis from the image side of the second spacer element to the object side of the third spacer element; and CP2 is the maximum thickness of the second spacer element, i.e., the maximum thickness of the second spacer element in the direction parallel to the optical axis. By controlling the ratio of the axial distance from the intersection of the object side of the third lens and the optical axis to the effective radius vertex of the object side of the third lens to the sum of the air gap on the optical axis between the second lens and the third lens and the sum of the separation distance on the optical axis between the second spacer element and the third spacer element and the maximum thickness of the second spacer element to be within the range, the risk of large gap variation during lens assembly caused by too large edge thickness and gap size of the lens mechanism part can be effectively prevented.

[0049] The imaging lens according to the embodiment of the present application comprises a lens barrel, an eight-lens group accommodated in the lens barrel, and a plurality of spacer elements, wherein the first lens to the eighth lens are sequentially arranged along the optical axis from the object side to the image side, the second spacer element is arranged between the second lens and the third lens, the third spacer element is arranged between the third lens and the fourth lens, the sixth spacer element is arranged between the sixth lens and the seventh lens, and the seventh spacer element is arranged between the seventh lens and the eighth lens. By such arrangement of the lens and by controlling the maximum height L of the lens barrel and the half of the diagonal length of the effective pixel area on the imaging surface of the lens ImgH to satisfy 1.0 < L / ImgH < 1.3, controlling the effective focal length f3 of the third lens and the radius of curvature R5 of the object side of the third lens to satisfy -27.5 < f3 / R5 < -8.5, and controlling the axial distance SAG31 from the intersection of the object side of the third lens and the optical axis to the effective radius vertex of the object side of the third lens, the air gap T23 on the optical axis between the second lens and the third lens, the separation distance EP23 on the optical axis between the second spacer element and the third spacer element, and the maximum thickness CP2 of the second spacer element to satisfy -0.5 < (SAG31+T23) / (EP23+CP2) < 0.1, the direct reflection of the light onto the front end surface of the lens barrel can be effectively prevented when the height of the lens barrel is too small; the bending degree of the overall lens structure can be limited, thereby effectively ensuring the thickness ratio of the lens and avoiding the occurrence of welding mark stray light; and the risk of large gap variation during lens assembly caused by too large edge thickness and gap size of the lens mechanism part can be effectively prevented.

[0050] In the example embodiment, the maximum height L of the lens barrel and half of the diagonal length of the effective pixel area on the lens imaging surface ImgH can satisfy 1.0 < L / ImgH < 1.3, the effective focal length f3 of the third lens and the radius of curvature R5 of the object side surface of the third lens can satisfy -27.5 < f3 / R5 < -8.5, the axial distance SAG31 from the intersection of the object side surface of the third lens and the optical axis to the effective radius vertex of the object side surface of the third lens, the air gap T23 of the second lens and the third lens on the optical axis, the interval distance EP23 of the second spacer element and the third spacer element on the optical axis, and the maximum thickness CP2 of the second spacer element can satisfy -0.5 < (SAG31+T23) / (EP23+CP2) < 0.1. When the imaging lens satisfies the condition formulae 1.0 < L / ImgH < 1.3 and -27.5 < f3 / R5 < -8.5, the miniaturization and assembly integrity of the imaging lens can be ensured, and stray light can be effectively reduced and avoided. However, the condition formula -27.5 < f3 / R5 < -8.5 of the lens is prone to cause the third lens to have a central thick and edge thin appearance, and the third lens is prone to be sensitive during assembly, and there is a large gap. Therefore, by controlling the axial distance SAG31 from the intersection of the object side surface of the third lens and the optical axis to the effective radius vertex of the object side surface of the third lens, the air gap T23 of the second lens and the third lens on the optical axis, the interval distance EP23 of the second spacer element and the third spacer element on the optical axis, and the maximum thickness CP2 of the second spacer element to satisfy -0.5 < (SAG31+T23) / (EP23+CP2) < 0.1, the assembly stability of the optical imaging lens can be improved, the second spacer element and the third spacer element are prevented from deforming, and the imaging quality of the optical imaging lens is improved.

[0051] The following table shows the sensitivity between the second lens and the third lens when the imaging lens respectively satisfies (SAG31+T23) / (EP23+CP2)=-1.5, (SAG31+T23) / (EP23+CP2)=-0.09, and (SAG31+T23) / (EP23+CP2)=0.8.

[0052]

[0053]

[0054] As shown in the table above, when the imaging lens satisfies the conditions 1.0 < L / ImgH < 1.3 and -27.5 < f3 / R5 < -8.5, the sensitivity Sp2 between the second and third lenses is -4.90 when (SAG31+T23) / (EP23+CP2) = -1.5; 2.00 when (SAG31+T23) / (EP23+CP2) = -0.09; and 4.90 when (SAG31+T23) / (EP23+CP2) = 0.8. Therefore, the sensitivity between the second and third lenses is relatively high when the value of (SAG31+T23) / (EP23+CP2) is less than or equal to -0.5 or greater than or equal to 0.1. Therefore, by placing (SAG31+T23) / (EP23+CP2) in the range of -0.5 to 0.1, this application helps to reduce the sensitivity between the second and third lenses, thereby improving the assembly stability and imaging quality of the optical imaging lens.

[0055] In an exemplary embodiment, the first lens has positive optical power, with a convex object-side surface and a concave image-side surface. The second lens has positive optical power, with a convex object-side surface and a concave image-side surface. The third lens has positive optical power, with a concave object-side surface and a convex image-side surface. The fourth lens has negative optical power, with a convex object-side surface and a concave image-side surface. The fifth lens has positive optical power, with a convex object-side surface and a concave image-side surface. The sixth lens has negative optical power, with a concave object-side surface and a concave image-side surface. The seventh lens has positive optical power, with a convex object-side surface and a convex image-side surface. The eighth lens has negative optical power and a concave object-side surface.

[0056] In an exemplary embodiment, at least one spacer element in the lens may further include: a first spacer element located between the first lens and the second lens and in direct contact with the image side of the first lens.

[0057] In an exemplary embodiment, at least one spacer element in the lens may further include a fourth spacer element located between the fourth lens and the fifth lens and in direct contact with the image side of the fourth lens.

[0058] In an exemplary embodiment, at least one spacer element in the lens may further include a fifth spacer element located between the fifth lens and the sixth lens and in direct contact with the image side of the fifth lens.

[0059] In an exemplary embodiment, the imaging lens of this application can satisfy the condition 1.0 < D0m - D0s < 4.0, where D0m is the outer diameter of the image-side end face of the lens barrel closest to the image side, and D0s is the outer diameter of the object-side end face of the lens barrel closest to the object side. By controlling the difference between the outer diameter of the image-side end face of the lens barrel closest to the image side and the outer diameter of the object-side end face of the lens barrel within this range, the step difference between lenses can be effectively limited, thus ensuring assembly stability to a certain extent.

[0060] In an exemplary embodiment, the imaging lens of this application can satisfy the condition -8.0 < SAG22 / CP2 < -3.0, where SAG22 is the axial distance 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, and CP2 is the maximum thickness of the second spacer element. By controlling the ratio of the axial distance 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 to the maximum thickness of the second spacer element to be within this range, the aperture size of the lens can be effectively limited structurally, thereby increasing the assembly stability of the lens.

[0061] In an exemplary embodiment, at least one spacer element in the lens further includes a fifth spacer element located between the fifth lens and the sixth lens and in direct contact with the image-side surface of the fifth lens. The imaging lens of this application satisfies the condition 5.0 < SAG52 / CP5 < 9.5, where SAG52 is the axial distance from the intersection of the image-side surface of the fifth lens and the optical axis to the vertex of the effective radius of the image-side surface of the fifth lens, and CP5 is the maximum thickness of the fifth spacer element. By controlling the ratio of the axial distance from the intersection of the image-side surface of the fifth lens and the optical axis to the vertex of the effective radius of the image-side surface of the fifth lens to the maximum thickness of the fifth spacer element to be within this range, the aperture size of the lens can be structurally effectively limited, thereby increasing the assembly stability of the lens.

[0062] In an exemplary embodiment, at least one spacer element in the lens further includes a fourth spacer element located between the fourth and fifth lenses and in direct contact with the image-side surface of the fourth lens. The imaging lens of this application satisfies the condition 12.0 < (EP23 + EP34) / T34 < 14.5, where EP23 is the distance between the second and third spacer elements on the optical axis, i.e., the distance from the image-side surface of the second spacer element to the object-side surface of the third spacer element on the optical axis; EP34 is the distance between the third and fourth spacer elements on the optical axis, i.e., the distance from the image-side surface of the third spacer element to the object-side surface of the fourth spacer element on the optical axis; and T34 is the air gap between the third and fourth lenses on the optical axis, i.e., the distance from the image-side surface of the third lens to the object-side surface of the fourth lens on the optical axis. By controlling the structural edge thickness of the third and fourth lenses and the air gap between them to satisfy the condition 12.0 < (EP23 + EP34) / T34 < 14.5, the structural strength of the lens can be effectively guaranteed, the change in gaps during assembly can be reduced, thereby ensuring the quality of the lens.

[0063] In an exemplary embodiment, the imaging lens of this application can satisfy the condition 0 < d6s / R12 < 0.5, where d6s is the inner diameter of the object-side surface of the sixth spacer element, and R12 is the radius of curvature of the image-side surface of the sixth lens. By controlling the ratio of the inner diameter of the object-side surface of the sixth spacer element to the radius of curvature of the image-side surface of the sixth lens within this range, stray light reflected from the image-side surface of the lens can be effectively blocked by the spacer element, thereby improving the imaging quality of the lens.

[0064] In an exemplary embodiment, at least one spacer element in the lens further includes a first spacer element located between the first lens and the second lens and in direct contact with the image-side surface of the first lens. The imaging lens of this application satisfies the condition 0.0 < (D1s - d1s) / ImgH < 1.5, where D1s is the outer diameter of the object-side surface of the first spacer element, d1s is the inner diameter of the object-side surface of the first spacer element, and ImgH is half the diagonal length of the effective pixel area on the imaging surface of the lens. By controlling the ratio of the difference between the outer diameter and the inner diameter of the object-side surface of the first spacer element to half the diagonal length of the effective pixel area on the imaging surface of the lens within this range, the length of the lens mechanism portion can be effectively guaranteed, thereby ensuring the probability of stray light reflection from the mechanism portion and further improving image quality.

[0065] In an exemplary embodiment, the imaging lens of this application can satisfy the condition 0.5 < (d0m - D7s) / (T78 - CT8) < 2.0, where d0m is the inner diameter of the image-side end face of the lens barrel closest to the image side, D7s is the outer diameter of the object-side surface of the seventh spacer element, T78 is the air gap between the seventh and eighth lenses on the optical axis, and CT8 is the center thickness of the eighth lens on the optical axis. By controlling the ratio of the difference between the inner diameter of the image-side end face of the lens barrel closest to the image side and the outer diameter of the object-side surface of the seventh spacer element, and the ratio of the difference between the air gap between the seventh and eighth lenses on the optical axis and the center thickness of the eighth lens on the optical axis, within this range, the size of the adhesive application area of ​​the lens barrel can be effectively constrained, ensuring lens reliability requirements. Simultaneously, the lens thickness can be constrained to effectively avoid weld lines, thereby mitigating stray light risks. Furthermore, the constraint on the air gap between the seventh and eighth lenses on the optical axis also ensures the assembly stability of the lens.

[0066] In an exemplary embodiment, the imaging lens of this application can satisfy the condition 4.5 < d0s / DT11 + d0m / DT82 < 5.5, where d0s is the inner diameter of the object-side end face of the lens barrel closest to the object side, DT11 is the maximum effective radius of the object-side surface of the first lens, d0m is the inner diameter of the image-side end face of the lens barrel closest to the image side, and DT82 is the maximum effective radius of the image-side surface of the eighth lens. By controlling the sum of the ratio of the inner diameter of the object-side end face of the lens barrel closest to the object side to the maximum effective radius of the object-side surface of the first lens, and the ratio of the inner diameter of the image-side end face of the lens barrel closest to the image side to the maximum effective radius of the image-side surface of the eighth lens within this range, the assembly step difference between the first lens and the eighth lens can be effectively limited structurally, ensuring that the stress points during assembly are based on a single line, thereby improving the assembly yield and ultimately enhancing the overall quality of the lens.

[0067] In an exemplary embodiment, the imaging lens of this application satisfies the condition -5.5 < f4 × (D3m - d3m) / (R7 × DT41) < -1.0, where f4 is the effective focal length of the fourth lens, D3m is the outer diameter of the image-side surface of the third spacer element, d3m is the inner diameter of the image-side surface of the third spacer element, R7 is the radius of curvature of the object-side surface of the fourth lens, and DT41 is the maximum effective radius of the object-side surface of the fourth lens. By controlling the effective focal length of the fourth lens, the outer diameter of the image-side surface of the third spacer element, the inner diameter of the image-side surface of the third spacer element, the radius of curvature of the object-side surface of the fourth lens, and the maximum effective radius of the object-side surface of the fourth lens to satisfy the condition -5.5 < f4 × (D3m - d3m) / (R7 × DT41) < -1.0, the light-blocking effect of the third spacer element on the fourth lens can be effectively limited structurally, thus avoiding light leakage from the fourth lens to a certain extent.

[0068] In an exemplary embodiment, the imaging lens of this application can satisfy the condition 1.5 < (D2m - d2m) / DT22 < 4.0, where D2m is the outer diameter of the image-side surface of the second spacer element, d2m is the inner diameter of the image-side surface of the second spacer element, and DT22 is the maximum effective radius of the image-side surface of the second lens. By controlling the ratio of the difference between the outer diameter and the inner diameter of the image-side surface of the second spacer element to the maximum effective radius of the image-side surface of the second lens within this range, the stability of the lens assembly gap can be effectively guaranteed.

[0069] In an exemplary embodiment, at least one spacer element in the lens further includes a fifth spacer element located between the fifth lens and the sixth lens and in direct contact with the image-side surface of the fifth lens. The imaging lens of this application satisfies the condition 0.3 < d5s / R10 < 0.7, where d5s is the inner diameter of the object-side surface of the fifth spacer element, and R10 is the radius of curvature of the image-side surface of the fifth lens. By controlling the ratio of the inner diameter of the object-side surface of the fifth spacer element to the radius of curvature of the image-side surface of the fifth lens within this range, the fit between the lens and the spacer element can be constrained to a certain extent, thereby ensuring assembly stability.

[0070] In an exemplary embodiment, at least one spacer element in the lens further includes a fourth spacer element located between the fourth and fifth lenses and in direct contact with the image-side surface of the fourth lens. The imaging lens of this application satisfies the condition 4.0 < (R6 + R7) / EP34 < 8.0, where R6 is the radius of curvature of the image-side surface of the third lens, R7 is the radius of curvature of the object-side surface of the fourth lens, and EP34 is the distance between the third and fourth spacer elements on the optical axis. By controlling the ratio of the sum of the radius of curvature of the image-side surface of the third lens and the radius of curvature of the object-side surface of the fourth lens to the distance between the third and fourth spacer elements on the optical axis within this range, the on-axis air gap between the third and fourth lenses can be effectively controlled, thereby constraining the edge thickness dimensions of the mechanism to ensure assembly stability.

[0071] In an exemplary embodiment, the imaging lens of this application may include at least one aperture stop. The aperture stop can constrain the optical path and control the light intensity. The aperture stop can be positioned at an appropriate location on the imaging lens; for example, the aperture stop can be positioned between the object side and the first lens.

[0072] In an exemplary embodiment, the imaging lens may optionally include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0073] In an exemplary embodiment, the first, second, third, fourth, fifth, sixth, seventh, and eighth lenses may have one or more aspherical mirror surfaces. Aspherical mirror surfaces have better radius of curvature characteristics, which has the advantages of improving distortion aberrations and astigmatism aberrations. By using aspherical mirror surfaces, aberrations that occur during imaging can be eliminated as much as possible, thereby improving image quality.

[0074] The imaging lens according to an embodiment of this application includes a lens barrel and an eight-element lens group and multiple spacer elements housed within the lens barrel. The first to eighth lenses are arranged sequentially along the optical axis from the object side to the image side. A second spacer element is provided between the second and third lenses, a third spacer element is provided between the third and fourth lenses, a sixth spacer element is provided between the sixth and seventh lenses, and a seventh spacer element is provided between the seventh and eighth lenses. By arranging the lens in this way, and controlling the maximum height L of the lens barrel to satisfy 1.0 < L / ImgH < 1.3 with half the diagonal length ImgH of the effective pixel area on the lens imaging plane, and controlling the effective focal length f3 of the third lens to satisfy -27.5 < f3 / R5 < -8.5 with the radius of curvature R5 of the object side surface of the third lens, the lens achieves this property. The axial distance SAG31 from the intersection of the object side and the optical axis of the third lens to the vertex of its effective radius on the object side, the air gap T23 between the second and third lenses on the optical axis, the spacing distance EP23 between the second and third spacers on the optical axis, and the maximum thickness CP2 of the second spacer satisfy -0.5 < (SAG31 + T23) / (EP23 + CP2) < 0.1. This can effectively prevent primary stray light from being directly reflected from the front surface of the lens barrel due to the small height of the lens barrel; it can limit the curvature of the overall lens structure, thereby effectively ensuring the thickness ratio of the lens and avoiding weld line stray light; it can also effectively prevent the assembly risk caused by excessive gap changes during lens assembly due to the excessive thickness and gap size of the lens mechanism.

[0075] On the other hand, the imaging lens according to the embodiment of this application includes a lens barrel and an eight-element lens group and a plurality of spacer elements housed in the lens barrel. The first to eighth lenses are arranged sequentially from the object side to the image side along the optical axis. A second spacer element is provided between the second and third lenses, a third spacer element is provided between the third and fourth lenses, a sixth spacer element is provided between the sixth and seventh lenses, and a seventh spacer element is provided between the seventh and eighth lenses. By arranging the lens in this way, and controlling the axial distance SAG22 from the intersection of the image side surface of the second lens and the optical axis to the effective radius vertex of the image side surface of the second lens to satisfy the condition -8.0 < SAG22 / CP2 < -3.0, the aperture size of the lens can be effectively limited structurally, thereby increasing the assembly stability of the lens.

[0076] On another aspect, the imaging lens according to the embodiments of this application includes a lens barrel and an eight-lens group and multiple spacer elements housed within the lens barrel. The first to eighth lenses are arranged sequentially along the optical axis from the object side to the image side. A second spacer element is provided between the second and third lenses, a third spacer element is provided between the third and fourth lenses, a sixth spacer element is provided between the sixth and seventh lenses, and a seventh spacer element is provided between the seventh and eighth lenses. This arrangement of the lens allows for control of the inner diameter d0 of the image-side end face of the lens barrel closest to the image side. The outer diameter D7s of the object side of the seventh spacer element, the air gap T78 between the seventh and eighth lenses on the optical axis, and the center thickness CT8 of the eighth lens on the optical axis satisfy the condition 0.5 < (d0m - D7s) / (T78 - CT8) < 2.0. This can effectively constrain the size of the adhesive application area of ​​the lens barrel, ensuring the reliability requirements of the lens. At the same time, it can also constrain the center thickness of the lens, so that the lens can effectively avoid weld lines, thereby avoiding the risk of stray light. Furthermore, the constraint of the air gap between the seventh and eighth lenses on the optical axis can also ensure the assembly stability of the lens.

[0077] On another aspect, the imaging lens according to the embodiments of this application includes a lens barrel and an eight-lens group and multiple spacer elements housed in the lens barrel. The first to eighth lenses are arranged sequentially from the object side to the image side along the optical axis. A second spacer element is provided between the second and third lenses, a third spacer element is provided between the third and fourth lenses, a sixth spacer element is provided between the sixth and seventh lenses, and a seventh spacer element is provided between the seventh and eighth lenses. By arranging the lens in this way and controlling the inner diameter d5s of the object side of the fifth spacer element and the radius of curvature R10 of the image side of the fifth lens to satisfy the condition 0.3 < d5s / R10 < 0.7, the matching state of the lens and the spacer element can be constrained to a certain extent, thereby ensuring the assembly stability.

[0078] However, those skilled in the art will understand that, without departing from the technical solutions claimed in this application, the number of lenses constituting the imaging lens and the number of spacers can be changed to obtain the various results and advantages described in this specification, and this application does not specifically limit them. For example, although eight lenses are described as an example in the embodiments, the imaging lens is not limited to including eight lenses. If necessary, the imaging lens may also include other numbers of lenses. Furthermore, as needed, the imaging lens may also include other numbers of spacers than those described in the above embodiments.

[0079] The following describes in further detail, with reference to the accompanying drawings, specific embodiments of the imaging lens applicable to the above-described embodiments.

[0080] Example 1

[0081] The following is for reference Figure 2 The imaging lens according to Embodiment 1 of this application is described.

[0082] like Figure 2 As shown, in this embodiment, the imaging lens includes a lens barrel P0 and 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 arranged sequentially along the optical axis from the object side to the image side and housed in the lens barrel P0.

[0083] In this embodiment, the imaging lens further includes a plurality of spacer elements: a first spacer element P1, located between the first lens E1 and the second lens E2 and in direct contact with the image-side surface of the first lens E1; a second spacer element P2, located between the second lens E2 and the third lens E3 and in direct contact with the image-side surface of the second lens E2; a third spacer element P3, located between the third lens E3 and the fourth lens E4 and in direct contact with the image-side surface of the third lens E3; a fourth spacer element P4, located between the fourth lens E4 and the fifth lens E5 and in direct contact with the image-side surface of the fourth lens E4; a fifth spacer element P5, located between the fifth lens E5 and the sixth lens E6 and in direct contact with the image-side surface of the fifth lens E5; a sixth spacer element P6, located between the sixth lens E6 and the seventh lens E7 and in direct contact with the image-side surface of the sixth lens E6; and a seventh spacer element P7, located between the seventh lens E7 and the eighth lens E8 and in direct contact with the image-side surface of the seventh lens E7.

[0084] In this embodiment, the first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being concave and its image-side surface S6 being convex. The fourth lens E4 has negative optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being concave. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being convex. The eighth lens E8 has negative optical power, with its object-side surface S15 being concave and its image-side surface S16 being convex.

[0085] In this embodiment, the imaging lens also includes a filter (not shown in the figure) located on the image side of the eighth lens E8, having an object side S17 and an image side S18, and an imaging surface S19 (not shown in the figure) located on the image side of the filter. Light from the object can, for example, pass through each surface S1 to S18 in sequence and finally be imaged on the imaging surface S19.

[0086] Table 1 shows the basic parameters of the imaging lens of Example 1, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0087]

[0088] Table 1

[0089] In Embodiment 1, the object-side surface and image-side surface of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces, and the surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0090]

[0091] Where x is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 below gives the higher-order coefficients A4, A6, A8, A16, A27, A18, A19 ... 10 A 12 A 14 and A 16 .

[0092]

[0093]

[0094] Table 2

[0095] Example 2

[0096] The following is for reference Figure 3 The imaging lens according to Embodiment 2 of this application is described.

[0097] like Figure 3As shown, in this embodiment, the imaging lens includes a lens barrel P0 and 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 arranged sequentially along the optical axis from the object side to the image side and housed in the lens barrel P0. The imaging lens also includes multiple spacer elements: a first spacer element P1, located between the first lens E1 and the second lens E2 and in direct contact with the image-side surface of the first lens E1; a second spacer element P2, located between the second lens E2 and the third lens E3 and in direct contact with the image-side surface of the second lens E2; a third spacer element P3, located between the third lens E3 and the fourth lens E4 and in direct contact with the image-side surface of the third lens E3; a fourth spacer element P4, located between the fourth lens E4 and the fifth lens E5 and in direct contact with the image-side surface of the fourth lens E4; a fifth spacer element P5, located between the fifth lens E5 and the sixth lens E6 and in direct contact with the image-side surface of the fifth lens E5; a sixth spacer element P6, located between the sixth lens E6 and the seventh lens E7 and in direct contact with the image-side surface of the sixth lens E6; and a seventh spacer element P7, located between the seventh lens E7 and the eighth lens E8 and in direct contact with the image-side surface of the seventh lens E7.

[0098] The structure of the imaging lens in this embodiment is the same as that of the imaging lens in Embodiment 1. That is, the basic parameter table of the imaging lens in this embodiment is the same as that in Table 1, and the table of higher-order coefficients of the aspherical mirror is the same as that in Table 2.

[0099] The difference between this embodiment and Embodiment 1 lies in the structural dimensions of some spacer elements and the spacing of some spacer elements along the optical axis. The values ​​of multiple parameters of the spacer elements included in the imaging lenses of this embodiment and Embodiment 1 are shown in Table 9 below. These multiple parameters specifically include:

[0100] The outer diameter D1s of the object side of the first spacer P1, the outer diameter D1m of the image side of the first spacer P1, the spacing EP34 between the third spacer P3 and the fourth spacer P4 on the optical axis, the inner diameter d4m of the image side of the fourth spacer P4, the outer diameter D6m of the image side of the sixth spacer P6, the inner diameter d6m of the image side of the sixth spacer P6, the maximum thickness CP3 of the third spacer P3, the maximum thickness CP7 of the seventh spacer P7, the spacing EP67 between the sixth spacer P6 and the seventh spacer P7 on the optical axis, and the seventh spacer P3... The outer diameter D7s of the object side of P7, the outer diameter D6s of the object side of the sixth spacer P6, the distance EP12 between the first spacer P1 and the second spacer P2 on the optical axis, the outer diameter D2s of the object side of the second spacer P2, the inner diameter d2s of the object side of the second spacer P2, the outer diameter D3s of the object side of the third spacer P3, the inner diameter d3s of the object side of the third spacer P3, the inner diameter d7s of the object side of the seventh spacer P7, the outer diameter D2m of the image side of the second spacer P2, and the outer diameter D3m of the image side of the third spacer P3. All parameters shown in Table 9 are in millimeters (mm), and the schematic diagrams of each parameter in the imaging lens structure are as follows: Figure 1 As shown.

[0101] Example 3

[0102] The following is for reference Figure 4 The optical lens according to Embodiment 3 of this application is described.

[0103] like Figure 4As shown, in this embodiment, the imaging lens includes a lens barrel P0 and 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 arranged sequentially along the optical axis from the object side to the image side and housed in the lens barrel P0. The imaging lens also includes multiple spacer elements: a first spacer element P1, located between the first lens E1 and the second lens E2 and in direct contact with the image-side surface of the first lens E1; a second spacer element P2, located between the second lens E2 and the third lens E3 and in direct contact with the image-side surface of the second lens E2; a third spacer element P3, located between the third lens E3 and the fourth lens E4 and in direct contact with the image-side surface of the third lens E3; a fourth spacer element P4, located between the fourth lens E4 and the fifth lens E5 and in direct contact with the image-side surface of the fourth lens E4; a fifth spacer element P5, located between the fifth lens E5 and the sixth lens E6 and in direct contact with the image-side surface of the fifth lens E5; a sixth spacer element P6, located between the sixth lens E6 and the seventh lens E7 and in direct contact with the image-side surface of the sixth lens E6; and a seventh spacer element P7, located between the seventh lens E7 and the eighth lens E8 and in direct contact with the image-side surface of the seventh lens E7.

[0104] The structure of the imaging lens in this embodiment is the same as that of the imaging lens in Embodiment 1. That is, the basic parameter table of the imaging lens in this embodiment is the same as that in Table 1, and the table of higher-order coefficients of the aspherical mirror is the same as that in Table 2.

[0105] The difference between this embodiment and Embodiment 1 lies in the structural dimensions of some spacer elements and the spacing of some spacer elements along the optical axis. The values ​​of multiple parameters of the spacer elements included in the imaging lenses of this embodiment and Embodiment 1 are also shown in Table 9 below. These multiple parameters of the spacer elements also include:

[0106] The outer diameter D1s of the object side of the first spacer P1, the outer diameter D1m of the image side of the first spacer P1, the spacing EP34 between the third spacer P3 and the fourth spacer P4 on the optical axis, the inner diameter d4m of the image side of the fourth spacer P4, the outer diameter D6m of the image side of the sixth spacer P6, the inner diameter d6m of the image side of the sixth spacer P6, the maximum thickness CP3 of the third spacer P3, the maximum thickness CP7 of the seventh spacer P7, the spacing EP67 between the sixth spacer P6 and the seventh spacer P7 on the optical axis, and the seventh spacer P3... The outer diameter D7s of the object side of P7, the outer diameter D6s of the object side of the sixth spacer P6, the distance EP12 between the first spacer P1 and the second spacer P2 on the optical axis, the outer diameter D2s of the object side of the second spacer P2, the inner diameter d2s of the object side of the second spacer P2, the outer diameter D3s of the object side of the third spacer P3, the inner diameter d3s of the object side of the third spacer P3, the inner diameter d7s of the object side of the seventh spacer P7, the outer diameter D2m of the image side of the second spacer P2, and the outer diameter D3m of the image side of the third spacer P3. All parameters shown in Table 9 are in millimeters (mm), and the schematic diagrams of each parameter in the imaging lens structure are as follows: Figure 1 As shown.

[0107] Figure 5 The on-axis chromatic aberration curves of the imaging lenses of Embodiments 1, 2 and 3 are shown, which represent the deviation of light of different wavelengths from the convergence focal point after passing through the lens. Figure 6 The astigmatism curves of the imaging lenses of Embodiments 1, 2 and 3 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 7 The distortion curves of the imaging lenses of Embodiments 1, 2 and 3 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 8 The magnification chromatic aberration curves of the imaging lenses of Embodiments 1, 2, and 3 are shown, representing the deviations in image height at different points on the imaging plane after light passes through the lens. According to... Figures 5 to 8 It can be seen that the imaging lenses given in Examples 1, 2 and 3 can achieve good imaging quality.

[0108] Example 4

[0109] The following is for reference Figure 9 The imaging lens according to Embodiment 4 of this application is described.

[0110] like Figure 9As shown, in this embodiment, the imaging lens includes a lens barrel P0 and 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 arranged sequentially along the optical axis from the object side to the image side and housed in the lens barrel P0.

[0111] In this embodiment, the imaging lens further includes a plurality of spacer elements: a first spacer element P1, located between the first lens E1 and the second lens E2 and in direct contact with the image-side surface of the first lens E1; a second spacer element P2, located between the second lens E2 and the third lens E3 and in direct contact with the image-side surface of the second lens E2; a third spacer element P3, located between the third lens E3 and the fourth lens E4 and in direct contact with the image-side surface of the third lens E3; a fourth spacer element P4, located between the fourth lens E4 and the fifth lens E5 and in direct contact with the image-side surface of the fourth lens E4; a fifth spacer element P5, located between the fifth lens E5 and the sixth lens E6 and in direct contact with the image-side surface of the fifth lens E5; a sixth spacer element P6, located between the sixth lens E6 and the seventh lens E7 and in direct contact with the image-side surface of the sixth lens E6; and a seventh spacer element P7, located between the seventh lens E7 and the eighth lens E8 and in direct contact with the image-side surface of the seventh lens E7.

[0112] In this embodiment, the first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being concave and its image-side surface S6 being convex. The fourth lens E4 has negative optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being concave. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being convex. The eighth lens E8 has negative optical power, with its object-side surface S15 being concave and its image-side surface S16 being convex.

[0113] In this embodiment, the imaging lens also includes a filter (not shown in the figure) located on the image side of the eighth lens E8, having an object side S17 and an image side S18, and an imaging surface S19 (not shown in the figure) located on the image side of the filter. Light from the object can, for example, pass through each surface S1 to S18 in sequence and finally be imaged on the imaging surface S19.

[0114] Table 3 shows the basic parameters of the imaging lens in Example 4, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0115]

[0116] Table 3

[0117] In this embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces. The shape of each aspherical surface can be defined by formula (1) given in embodiment 1 above. Table 4 shows the higher-order coefficients A4, A6, A8, and A6 that can be used for each aspherical mirror surface S1 to S16 in this embodiment. 10 A 12 A 14 and A 16 .

[0118] Face number A4 A6 A8 A10 A12 A14 A16 S1 -6.2673E-02 -4.7451E-03 -5.8277E-04 4.9556E-04 -1.0878E-04 3.6566E-05 -9.0286E-05 S2 -1.3630E-01 7.6197E-03 1.7442E-03 3.6786E-04 -1.1624E-03 -3.8283E-04 -3.8943E-04 S3 -1.6625E-01 1.2225E-02 3.0946E-03 2.9030E-04 -1.9243E-03 -6.2762E-04 -5.1224E-04 S4 -2.0388E-01 1.6167E-02 3.1092E-03 -3.1165E-03 -2.7200E-03 -6.6075E-04 -1.7276E-04 S5 9.4491E-02 1.9748E-02 -6.0286E-03 1.2588E-03 -1.9662E-03 7.2328E-04 -9.8856E-05 S6 2.7355E-01 -1.8092E-02 -5.0267E-03 2.5195E-03 -9.9446E-04 1.1252E-03 -1.1220E-04 S7 -6.9986E-02 -2.1602E-02 8.0219E-03 -1.0837E-03 -2.3193E-03 2.4081E-04 2.3283E-04 S8 -1.5112E-01 1.3232E-02 8.0842E-03 9.7499E-04 -1.2672E-03 -2.9045E-04 3.4442E-04 S9 -6.0674E-02 -3.8033E-04 8.4870E-04 -4.3618E-03 2.7460E-03 -7.2529E-04 1.5155E-04 S10 -3.3568E-02 -2.3887E-03 1.8311E-03 -4.8798E-03 1.4663E-03 5.2752E-04 -2.5908E-04 S11 -5.6593E-02 -3.6300E-02 -4.0565E-03 1.7603E-03 9.3635E-04 -3.1984E-04 5.2335E-04 S12 -5.8616E-01 9.9419E-02 -1.0103E-02 2.2967E-03 1.3597E-03 -8.0772E-04 8.7673E-04 S13 -1.0258E+00 7.7783E-02 4.6975E-03 2.1487E-03 -6.1483E-06 5.9296E-04 4.4939E-04 S14 7.6971E-01 -1.9907E-01 5.3753E-02 -7.3475E-03 -5.5078E-03 -1.6294E-03 -2.8730E-03 S15 1.1225E+00 -3.7404E-03 1.4603E-02 -1.8833E-02 -1.5751E-02 1.2310E-05 -2.2865E-03 S16 -1.1685E-01 -1.3592E-01 1.5686E-01 -6.8693E-03 -1.4445E-03 -1.0953E-02 -1.4669E-03

[0119] Table 4

[0120] Example 5

[0121] The following is for reference Figure 10 The imaging lens according to Embodiment 5 of this application is described.

[0122] like Figure 10 As shown, in this embodiment, the imaging lens includes a lens barrel P0 and 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 arranged sequentially along the optical axis from the object side to the image side and housed in the lens barrel P0. The imaging lens also includes multiple spacer elements: a first spacer element P1, located between the first lens E1 and the second lens E2 and in direct contact with the image-side surface of the first lens E1; a second spacer element P2, located between the second lens E2 and the third lens E3 and in direct contact with the image-side surface of the second lens E2; a third spacer element P3, located between the third lens E3 and the fourth lens E4 and in direct contact with the image-side surface of the third lens E3; a fourth spacer element P4, located between the fourth lens E4 and the fifth lens E5 and in direct contact with the image-side surface of the fourth lens E4; a fifth spacer element P5, located between the fifth lens E5 and the sixth lens E6 and in direct contact with the image-side surface of the fifth lens E5; a sixth spacer element P6, located between the sixth lens E6 and the seventh lens E7 and in direct contact with the image-side surface of the sixth lens E6; and a seventh spacer element P7, located between the seventh lens E7 and the eighth lens E8 and in direct contact with the image-side surface of the seventh lens E7.

[0123] The structure of the imaging lens in this embodiment is the same as that of the imaging lens in embodiment 4. That is, the basic parameter table of the imaging lens in this embodiment is the same as that in Table 3, and the table of higher-order coefficients of the aspherical mirror is the same as that in Table 4.

[0124] The difference between this embodiment and embodiment 4 lies in the structural dimensions of some spacer elements and the spacing of some spacer elements along the optical axis. The values ​​of multiple parameters of the spacer elements included in the imaging lenses of this embodiment and embodiment 4 are shown in Table 9 below. These multiple parameters specifically include:

[0125] The outer diameter D1s of the object side of the first spacer P1, the outer diameter D1m of the image side of the first spacer P1, the spacing EP34 between the third spacer P3 and the fourth spacer P4 on the optical axis, the inner diameter d4m of the image side of the fourth spacer P4, the outer diameter D6m of the image side of the sixth spacer P6, the inner diameter d6m of the image side of the sixth spacer P6, the maximum thickness CP3 of the third spacer P3, the maximum thickness CP7 of the seventh spacer P7, the spacing EP67 between the sixth spacer P6 and the seventh spacer P7 on the optical axis, and the seventh spacer P3... The outer diameter D7s of the object side of P7, the outer diameter D6s of the object side of the sixth spacer P6, the distance EP12 between the first spacer P1 and the second spacer P2 on the optical axis, the outer diameter D2s of the object side of the second spacer P2, the inner diameter d2s of the object side of the second spacer P2, the outer diameter D3s of the object side of the third spacer P3, the inner diameter d3s of the object side of the third spacer P3, the inner diameter d7s of the object side of the seventh spacer P7, the outer diameter D2m of the image side of the second spacer P2, and the outer diameter D3m of the image side of the third spacer P3. All parameters shown in Table 9 are in millimeters (mm), and the schematic diagrams of each parameter in the imaging lens structure are as follows: Figure 1 As shown.

[0126] Example 6

[0127] The following is for reference Figure 11 The optical lens according to Embodiment 6 of this application is described.

[0128] like Figure 11As shown, in this embodiment, the imaging lens includes a lens barrel P0 and 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 arranged sequentially along the optical axis from the object side to the image side and housed in the lens barrel P0. The imaging lens also includes multiple spacer elements: a first spacer element P1, located between the first lens E1 and the second lens E2 and in direct contact with the image-side surface of the first lens E1; a second spacer element P2, located between the second lens E2 and the third lens E3 and in direct contact with the image-side surface of the second lens E2; a third spacer element P3, located between the third lens E3 and the fourth lens E4 and in direct contact with the image-side surface of the third lens E3; a fourth spacer element P4, located between the fourth lens E4 and the fifth lens E5 and in direct contact with the image-side surface of the fourth lens E4; a fifth spacer element P5, located between the fifth lens E5 and the sixth lens E6 and in direct contact with the image-side surface of the fifth lens E5; a sixth spacer element P6, located between the sixth lens E6 and the seventh lens E7 and in direct contact with the image-side surface of the sixth lens E6; and a seventh spacer element P7, located between the seventh lens E7 and the eighth lens E8 and in direct contact with the image-side surface of the seventh lens E7.

[0129] The structure of the imaging lens in this embodiment is the same as that of the imaging lens in embodiment 4. That is, the basic parameter table of the imaging lens in this embodiment is the same as that in Table 3, and the table of higher-order coefficients of the aspherical mirror is the same as that in Table 4.

[0130] The difference between this embodiment and embodiment 4 lies in the structural dimensions of some spacer elements and the spacing of some spacer elements along the optical axis. The values ​​of multiple parameters of the spacer elements included in the imaging lenses of this embodiment and embodiment 4 are also shown in Table 9 below. These multiple parameters of the spacer elements also include:

[0131] The outer diameter D1s of the object side of the first spacer P1, the outer diameter D1m of the image side of the first spacer P1, the spacing EP34 between the third spacer P3 and the fourth spacer P4 on the optical axis, the inner diameter d4m of the image side of the fourth spacer P4, the outer diameter D6m of the image side of the sixth spacer P6, the inner diameter d6m of the image side of the sixth spacer P6, the maximum thickness CP3 of the third spacer P3, the maximum thickness CP7 of the seventh spacer P7, the spacing EP67 between the sixth spacer P6 and the seventh spacer P7 on the optical axis, and the seventh spacer P3... The outer diameter D7s of the object side of P7, the outer diameter D6s of the object side of the sixth spacer P6, the distance EP12 between the first spacer P1 and the second spacer P2 on the optical axis, the outer diameter D2s of the object side of the second spacer P2, the inner diameter d2s of the object side of the second spacer P2, the outer diameter D3s of the object side of the third spacer P3, the inner diameter d3s of the object side of the third spacer P3, the inner diameter d7s of the object side of the seventh spacer P7, the outer diameter D2m of the image side of the second spacer P2, and the outer diameter D3m of the image side of the third spacer P3. All parameters shown in Table 9 are in millimeters (mm), and the schematic diagrams of each parameter in the imaging lens structure are as follows: Figure 1 As shown.

[0132] Figure 12 The on-axis chromatic aberration curves of the imaging lenses of Embodiments 4, 5 and 6 are shown, which represent the deviation of light of different wavelengths from the convergence focal point after passing through the lens. Figure 13 The astigmatism curves of the imaging lenses of Examples 4, 5 and 6 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 14 The distortion curves of the imaging lenses of Examples 4, 5 and 6 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 15 The magnification chromatic aberration curves of the imaging lenses of Examples 4, 5, and 6 are shown, representing the deviations in image height at different points on the imaging plane after light passes through the lens. According to... Figures 12 to 15 It can be seen that the imaging lenses given in Examples 4, 5 and 6 can achieve good imaging quality.

[0133] Example 7

[0134] The following is for reference Figure 16 The imaging lens according to Embodiment 7 of this application is described.

[0135] like Figure 16As shown, in this embodiment, the imaging lens includes a lens barrel P0 and 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 arranged sequentially along the optical axis from the object side to the image side and housed in the lens barrel P0.

[0136] In this embodiment, the imaging lens further includes a plurality of spacer elements: a first spacer element P1, located between the first lens E1 and the second lens E2 and in direct contact with the image-side surface of the first lens E1; a second spacer element P2, located between the second lens E2 and the third lens E3 and in direct contact with the image-side surface of the second lens E2; a third spacer element P3, located between the third lens E3 and the fourth lens E4 and in direct contact with the image-side surface of the third lens E3; a fourth spacer element P4, located between the fourth lens E4 and the fifth lens E5 and in direct contact with the image-side surface of the fourth lens E4; a fifth spacer element P5, located between the fifth lens E5 and the sixth lens E6 and in direct contact with the image-side surface of the fifth lens E5; a sixth spacer element P6, located between the sixth lens E6 and the seventh lens E7 and in direct contact with the image-side surface of the sixth lens E6; and a seventh spacer element P7, located between the seventh lens E7 and the eighth lens E8 and in direct contact with the image-side surface of the seventh lens E7.

[0137] In this embodiment, the first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being concave and its image-side surface S6 being convex. The fourth lens E4 has negative optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being concave. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being convex. The eighth lens E8 has negative optical power, with its object-side surface S15 being concave and its image-side surface S16 being concave.

[0138] In this embodiment, the imaging lens also includes a filter (not shown in the figure) located on the image side of the eighth lens E8, having an object side S17 and an image side S18, and an imaging surface S19 (not shown in the figure) located on the image side of the filter. Light from the object can, for example, pass through each surface S1 to S18 in sequence and finally be imaged on the imaging surface S19.

[0139] Table 5 shows the basic parameters of the imaging lens of Example 7, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0140]

[0141]

[0142] Table 5

[0143] In this embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces. The shape of each aspherical surface can be defined by formula (1) given in embodiment 1 above. Table 6 shows the higher-order coefficients A4, A6, A8, and A6 that can be used for each aspherical mirror surface S1 to S16 in this embodiment. 10 A 12 A 14 and A 16 .

[0144] Face number A4 A6 A8 A10 A12 A14 A16 S1 -1.1546E-01 -9.2837E-03 -3.0998E-03 4.2445E-04 -5.1222E-04 1.6062E-04 8.1420E-06 S2 -2.0428E-01 1.1840E-02 1.7423E-03 -2.7999E-03 -6.3975E-04 -2.5219E-04 1.7797E-04 S3 -2.1150E-01 3.5257E-02 3.5479E-03 -2.5555E-03 -1.0739E-03 -5.2529E-05 1.1312E-04 S4 -2.4339E-01 2.3986E-02 -1.0900E-03 -1.7387E-03 -6.7661E-04 1.7729E-04 -3.6683E-06 S5 1.4659E-01 -1.7594E-02 -1.0908E-02 6.0606E-05 -1.1227E-03 5.1582E-04 5.4138E-05 S6 3.2179E-01 -6.5680E-02 -1.0109E-02 5.2696E-04 -1.1606E-03 5.6473E-04 -1.2219E-04 S7 -8.3802E-02 -9.7825E-03 5.6202E-03 -5.3253E-03 -5.2124E-04 -2.9075E-04 -3.0669E-05 S8 -1.5707E-01 2.4710E-02 9.7254E-03 -2.8484E-03 -3.7941E-04 -1.9336E-04 2.9963E-05 S9 -9.2234E-02 1.0350E-02 -1.9719E-03 -3.0758E-04 3.5558E-04 -1.7585E-04 7.7243E-05 S10 -1.0831E-01 2.3377E-02 -5.8009E-03 1.1670E-04 -2.0185E-05 4.4146E-05 -8.6271E-06 S11 -1.3975E-01 -4.4772E-02 3.0884E-03 4.9927E-04 1.5299E-03 1.0305E-04 7.9349E-05 S12 -6.4122E-01 1.0949E-01 -1.1157E-02 8.2052E-03 9.2343E-04 4.5868E-04 -3.8888E-04 S13 -1.7031E+00 2.7124E-01 -2.0913E-02 4.3311E-03 -6.6402E-03 1.4715E-03 1.0356E-04 S14 1.2681E+00 -1.9906E-01 6.9535E-02 -2.9285E-02 7.4182E-03 1.3320E-03 -9.3866E-04 S15 1.4616E+00 -1.4910E-01 1.1285E-01 -5.9988E-02 1.2633E-02 -5.3265E-03 1.9330E-03 S16 -8.1711E-01 -2.6514E-01 1.1349E-02 -4.5386E-02 1.3981E-02 -4.6167E-03 2.5343E-03

[0145] Table 6

[0146] Example 8

[0147] The following is for reference Figure 17 The imaging lens according to Embodiment 8 of this application is described.

[0148] like Figure 17 As shown, in this embodiment, the imaging lens includes a lens barrel P0 and 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 arranged sequentially along the optical axis from the object side to the image side and housed in the lens barrel P0. The imaging lens also includes multiple spacer elements: a first spacer element P1, located between the first lens E1 and the second lens E2 and in direct contact with the image-side surface of the first lens E1; a second spacer element P2, located between the second lens E2 and the third lens E3 and in direct contact with the image-side surface of the second lens E2; a third spacer element P3, located between the third lens E3 and the fourth lens E4 and in direct contact with the image-side surface of the third lens E3; a fourth spacer element P4, located between the fourth lens E4 and the fifth lens E5 and in direct contact with the image-side surface of the fourth lens E4; a fifth spacer element P5, located between the fifth lens E5 and the sixth lens E6 and in direct contact with the image-side surface of the fifth lens E5; a sixth spacer element P6, located between the sixth lens E6 and the seventh lens E7 and in direct contact with the image-side surface of the sixth lens E6; and a seventh spacer element P7, located between the seventh lens E7 and the eighth lens E8 and in direct contact with the image-side surface of the seventh lens E7.

[0149] The structure of the imaging lens in this embodiment is the same as that of the imaging lens in embodiment 7. That is, the basic parameter table of the imaging lens in this embodiment is the same as that in Table 5, and the table of higher-order coefficients of the aspherical mirror is the same as that in Table 6.

[0150] The difference between this embodiment and embodiment 7 lies in the structural dimensions of some spacer elements and the spacing of some spacer elements along the optical axis. The values ​​of multiple parameters of the spacer elements included in the imaging lenses of this embodiment and embodiment 7 are shown in Table 9 below. These multiple parameters specifically include:

[0151] The outer diameter D1s of the object side of the first spacer P1, the outer diameter D1m of the image side of the first spacer P1, the spacing EP34 between the third spacer P3 and the fourth spacer P4 on the optical axis, the inner diameter d4m of the image side of the fourth spacer P4, the outer diameter D6m of the image side of the sixth spacer P6, the inner diameter d6m of the image side of the sixth spacer P6, the maximum thickness CP3 of the third spacer P3, the maximum thickness CP7 of the seventh spacer P7, the spacing EP67 between the sixth spacer P6 and the seventh spacer P7 on the optical axis, and the seventh spacer P3... The outer diameter D7s of the object side of P7, the outer diameter D6s of the object side of the sixth spacer P6, the distance EP12 between the first spacer P1 and the second spacer P2 on the optical axis, the outer diameter D2s of the object side of the second spacer P2, the inner diameter d2s of the object side of the second spacer P2, the outer diameter D3s of the object side of the third spacer P3, the inner diameter d3s of the object side of the third spacer P3, the inner diameter d7s of the object side of the seventh spacer P7, the outer diameter D2m of the image side of the second spacer P2, and the outer diameter D3m of the image side of the third spacer P3. All parameters shown in Table 9 are in millimeters (mm), and the schematic diagrams of each parameter in the imaging lens structure are as follows: Figure 1 As shown.

[0152] Example 9

[0153] The following is for reference Figure 18 The optical lens according to Embodiment 9 of this application is described.

[0154] like Figure 18As shown, in this embodiment, the imaging lens includes a lens barrel P0 and 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 arranged sequentially along the optical axis from the object side to the image side and housed in the lens barrel P0. The imaging lens also includes multiple spacer elements: a first spacer element P1, located between the first lens E1 and the second lens E2 and in direct contact with the image-side surface of the first lens E1; a second spacer element P2, located between the second lens E2 and the third lens E3 and in direct contact with the image-side surface of the second lens E2; a third spacer element P3, located between the third lens E3 and the fourth lens E4 and in direct contact with the image-side surface of the third lens E3; a fourth spacer element P4, located between the fourth lens E4 and the fifth lens E5 and in direct contact with the image-side surface of the fourth lens E4; a fifth spacer element P5, located between the fifth lens E5 and the sixth lens E6 and in direct contact with the image-side surface of the fifth lens E5; a sixth spacer element P6, located between the sixth lens E6 and the seventh lens E7 and in direct contact with the image-side surface of the sixth lens E6; and a seventh spacer element P7, located between the seventh lens E7 and the eighth lens E8 and in direct contact with the image-side surface of the seventh lens E7.

[0155] The structure of the imaging lens in this embodiment is the same as that of the imaging lens in embodiment 7. That is, the basic parameter table of the imaging lens in this embodiment is the same as that in Table 5, and the table of higher-order coefficients of the aspherical mirror is the same as that in Table 6.

[0156] The difference between this embodiment and embodiment 7 lies in the structural dimensions of some spacer elements and the spacing of some spacer elements along the optical axis. The values ​​of multiple parameters of the spacer elements included in the imaging lenses of this embodiment and embodiment 7 are also shown in Table 9 below. These multiple parameters of the spacer elements also include:

[0157] The outer diameter D1s of the object side of the first spacer P1, the outer diameter D1m of the image side of the first spacer P1, the spacing EP34 between the third spacer P3 and the fourth spacer P4 on the optical axis, the inner diameter d4m of the image side of the fourth spacer P4, the outer diameter D6m of the image side of the sixth spacer P6, the inner diameter d6m of the image side of the sixth spacer P6, the maximum thickness CP3 of the third spacer P3, the maximum thickness CP7 of the seventh spacer P7, the spacing EP67 between the sixth spacer P6 and the seventh spacer P7 on the optical axis, and the seventh spacer P3... The outer diameter D7s of the object side of P7, the outer diameter D6s of the object side of the sixth spacer P6, the distance EP12 between the first spacer P1 and the second spacer P2 on the optical axis, the outer diameter D2s of the object side of the second spacer P2, the inner diameter d2s of the object side of the second spacer P2, the outer diameter D3s of the object side of the third spacer P3, the inner diameter d3s of the object side of the third spacer P3, the inner diameter d7s of the object side of the seventh spacer P7, the outer diameter D2m of the image side of the second spacer P2, and the outer diameter D3m of the image side of the third spacer P3. All parameters shown in Table 9 are in millimeters (mm), and the schematic diagrams of each parameter in the imaging lens structure are as follows: Figure 1 As shown.

[0158] Figure 19 The on-axis chromatic aberration curves of the imaging lenses of Embodiments 7, 8 and 9 are shown, which represent the deviation of light of different wavelengths from the convergence focal point after passing through the lens. Figure 20 The astigmatism curves of the imaging lenses of Embodiments 7, 8 and 9 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 21 The distortion curves of the imaging lenses of Embodiments 7, 8 and 9 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 22 The magnification chromatic aberration curves of the imaging lenses of Embodiments 7, 8, and 9 are shown, representing the deviations in image height at different points on the imaging plane after light passes through the lens. According to... Figures 19 to 22 It can be seen that the imaging lenses given in Examples 7, 8 and 9 can achieve good imaging quality.

[0159] Example 10

[0160] The following is for reference Figure 23 The imaging lens according to Embodiment 10 of this application is described.

[0161] like Figure 23As shown, in this embodiment, the imaging lens includes a lens barrel P0 and 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 arranged sequentially along the optical axis from the object side to the image side and housed in the lens barrel P0.

[0162] In this embodiment, the imaging lens further includes a plurality of spacer elements: a first spacer element P1, located between the first lens E1 and the second lens E2 and in direct contact with the image-side surface of the first lens E1; a second spacer element P2, located between the second lens E2 and the third lens E3 and in direct contact with the image-side surface of the second lens E2; a third spacer element P3, located between the third lens E3 and the fourth lens E4 and in direct contact with the image-side surface of the third lens E3; a fourth spacer element P4, located between the fourth lens E4 and the fifth lens E5 and in direct contact with the image-side surface of the fourth lens E4; a fifth spacer element P5, located between the fifth lens E5 and the sixth lens E6 and in direct contact with the image-side surface of the fifth lens E5; a sixth spacer element P6, located between the sixth lens E6 and the seventh lens E7 and in direct contact with the image-side surface of the sixth lens E6; and a seventh spacer element P7, located between the seventh lens E7 and the eighth lens E8 and in direct contact with the image-side surface of the seventh lens E7.

[0163] In this embodiment, the first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being concave and its image-side surface S6 being convex. The fourth lens E4 has negative optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being concave. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being convex. The eighth lens E8 has negative optical power, with its object-side surface S15 being concave and its image-side surface S16 being convex.

[0164] In this embodiment, the imaging lens also includes a filter (not shown in the figure) located on the image side of the eighth lens E8, having an object side S17 and an image side S18, and an imaging surface S19 (not shown in the figure) located on the image side of the filter. Light from the object can, for example, pass through each surface S1 to S18 in sequence and finally be imaged on the imaging surface S19.

[0165] Table 7 shows the basic parameters of the imaging lens of Example 10, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0166]

[0167]

[0168] Table 7

[0169] In this embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces. The shape of each aspherical surface can be defined by formula (1) given in embodiment 1 above. Table 8 shows the higher-order coefficients A4, A6, A8, and A6 that can be used for each aspherical mirror surface S1 to S16 in this embodiment. 10 A 12 A 14 and A 16 .

[0170] Face number A4 A6 A8 A10 A12 A14 A16 S1 -2.3922E-01 -2.4177E-02 -4.9648E-03 2.7928E-03 -2.9073E-04 1.2490E-04 -4.7048E-04 S2 -3.1412E-01 1.4154E-02 -1.2447E-02 -7.4321E-03 -2.3795E-03 2.7586E-04 -1.2327E-04 S3 -2.6447E-01 5.4099E-02 -1.2952E-02 -1.1505E-02 -1.7924E-03 1.0806E-03 5.9073E-05 S4 -3.6716E-01 3.6022E-02 -1.8532E-02 -6.3198E-03 1.2719E-03 1.1371E-03 -5.0328E-04 S5 5.8303E-02 -5.7380E-02 -2.6523E-02 -3.9197E-04 -3.4457E-04 7.9454E-04 -4.7305E-04 S6 3.0952E-01 -1.0507E-01 -1.3780E-02 -8.7513E-04 -2.5487E-04 6.8898E-04 -3.2642E-05 S7 -4.6819E-02 -1.7432E-02 4.9982E-03 -8.5192E-03 -7.6015E-04 -8.2387E-04 8.4467E-05 S8 -1.8534E-01 5.0899E-02 3.0777E-03 -5.2243E-03 -1.6599E-03 -1.3778E-04 2.3471E-04 S9 -1.6993E-01 8.7819E-02 2.1314E-02 1.2960E-02 -2.3785E-03 -1.2176E-03 6.5541E-04 S10 -1.0178E-01 6.9469E-02 1.2046E-02 1.3339E-02 -6.5622E-04 -3.7747E-03 4.9481E-04 S11 -1.4354E-01 -6.9670E-02 2.3193E-02 5.7146E-03 3.6453E-03 -7.8795E-04 -6.9764E-04 S12 -7.2237E-01 1.6133E-01 1.3130E-02 1.5665E-02 4.4462E-03 1.5695E-03 2.0238E-04 S13 -2.3948E+00 6.6416E-01 -1.8488E-01 -1.1991E-02 2.2098E-03 5.3462E-03 -5.7003E-03 S14 2.6416E+00 -3.2503E-01 1.5438E-01 -2.5272E-02 4.1473E-02 -2.2471E-02 4.4265E-03 S15 1.6494E+00 -2.0142E-01 -3.5773E-02 -1.2492E-01 4.6796E-03 -7.3332E-03 1.3210E-02 S16 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00

[0171] Table 8

[0172] Example 11

[0173] The following is for reference Figure 24 The imaging lens according to Embodiment 11 of this application is described.

[0174] like Figure 24 As shown, in this embodiment, the imaging lens includes a lens barrel P0 and 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 arranged sequentially along the optical axis from the object side to the image side and housed in the lens barrel P0. The imaging lens also includes multiple spacer elements: a first spacer element P1, located between the first lens E1 and the second lens E2 and in direct contact with the image-side surface of the first lens E1; a second spacer element P2, located between the second lens E2 and the third lens E3 and in direct contact with the image-side surface of the second lens E2; a third spacer element P3, located between the third lens E3 and the fourth lens E4 and in direct contact with the image-side surface of the third lens E3; a fourth spacer element P4, located between the fourth lens E4 and the fifth lens E5 and in direct contact with the image-side surface of the fourth lens E4; a fifth spacer element P5, located between the fifth lens E5 and the sixth lens E6 and in direct contact with the image-side surface of the fifth lens E5; a sixth spacer element P6, located between the sixth lens E6 and the seventh lens E7 and in direct contact with the image-side surface of the sixth lens E6; and a seventh spacer element P7, located between the seventh lens E7 and the eighth lens E8 and in direct contact with the image-side surface of the seventh lens E7.

[0175] The structure of the imaging lens in this embodiment is the same as that of the imaging lens in embodiment 10. That is, the basic parameter table of the imaging lens in this embodiment is the same as that in Table 7, and the table of higher-order coefficients of the aspherical mirror is the same as that in Table 8.

[0176] The difference between this embodiment and embodiment 10 lies in the structural dimensions of some spacer elements and the spacing of some spacer elements along the optical axis. The values ​​of multiple parameters of the spacer elements included in the imaging lenses of this embodiment and embodiment 10 are shown in Table 9 below. These multiple parameters specifically include:

[0177] The outer diameter D1s of the object side of the first spacer P1, the outer diameter D1m of the image side of the first spacer P1, the spacing EP34 between the third spacer P3 and the fourth spacer P4 on the optical axis, the inner diameter d4m of the image side of the fourth spacer P4, the outer diameter D6m of the image side of the sixth spacer P6, the inner diameter d6m of the image side of the sixth spacer P6, the maximum thickness CP3 of the third spacer P3, the maximum thickness CP7 of the seventh spacer P7, the spacing EP67 between the sixth spacer P6 and the seventh spacer P7 on the optical axis, and the seventh spacer P3... The outer diameter D7s of the object side of P7, the outer diameter D6s of the object side of the sixth spacer P6, the distance EP12 between the first spacer P1 and the second spacer P2 on the optical axis, the outer diameter D2s of the object side of the second spacer P2, the inner diameter d2s of the object side of the second spacer P2, the outer diameter D3s of the object side of the third spacer P3, the inner diameter d3s of the object side of the third spacer P3, the inner diameter d7s of the object side of the seventh spacer P7, the outer diameter D2m of the image side of the second spacer P2, and the outer diameter D3m of the image side of the third spacer P3. All parameters shown in Table 9 are in millimeters (mm), and the schematic diagrams of each parameter in the imaging lens structure are as follows: Figure 1 As shown.

[0178] Example 12

[0179] The following is for reference Figure 25 The optical lens according to Embodiment 12 of this application is described.

[0180] like Figure 25As shown, in this embodiment, the imaging lens includes a lens barrel P0 and 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 arranged sequentially along the optical axis from the object side to the image side and housed in the lens barrel P0. The imaging lens also includes multiple spacer elements: a first spacer element P1, located between the first lens E1 and the second lens E2 and in direct contact with the image-side surface of the first lens E1; a second spacer element P2, located between the second lens E2 and the third lens E3 and in direct contact with the image-side surface of the second lens E2; a third spacer element P3, located between the third lens E3 and the fourth lens E4 and in direct contact with the image-side surface of the third lens E3; a fourth spacer element P4, located between the fourth lens E4 and the fifth lens E5 and in direct contact with the image-side surface of the fourth lens E4; a fifth spacer element P5, located between the fifth lens E5 and the sixth lens E6 and in direct contact with the image-side surface of the fifth lens E5; a sixth spacer element P6, located between the sixth lens E6 and the seventh lens E7 and in direct contact with the image-side surface of the sixth lens E6; and a seventh spacer element P7, located between the seventh lens E7 and the eighth lens E8 and in direct contact with the image-side surface of the seventh lens E7.

[0181] The structure of the imaging lens in this embodiment is the same as that of the imaging lens in embodiment 10. That is, the basic parameter table of the imaging lens in this embodiment is the same as that in Table 7, and the table of higher-order coefficients of the aspherical mirror is the same as that in Table 8.

[0182] The difference between this embodiment and embodiment 10 lies in the structural dimensions of some spacer elements and the spacing of some spacer elements along the optical axis. The values ​​of multiple parameters of the spacer elements included in the imaging lenses of this embodiment and embodiment 10 are also shown in Table 9 below. These multiple parameters of the spacer elements also include:

[0183] The outer diameter D1s of the object side of the first spacer P1, the outer diameter D1m of the image side of the first spacer P1, the spacing EP34 between the third spacer P3 and the fourth spacer P4 on the optical axis, the inner diameter d4m of the image side of the fourth spacer P4, the outer diameter D6m of the image side of the sixth spacer P6, the inner diameter d6m of the image side of the sixth spacer P6, the maximum thickness CP3 of the third spacer P3, the maximum thickness CP7 of the seventh spacer P7, the spacing EP67 between the sixth spacer P6 and the seventh spacer P7 on the optical axis, and the seventh spacer P3... The outer diameter D7s of the object side of P7, the outer diameter D6s of the object side of the sixth spacer P6, the distance EP12 between the first spacer P1 and the second spacer P2 on the optical axis, the outer diameter D2s of the object side of the second spacer P2, the inner diameter d2s of the object side of the second spacer P2, the outer diameter D3s of the object side of the third spacer P3, the inner diameter d3s of the object side of the third spacer P3, the inner diameter d7s of the object side of the seventh spacer P7, the outer diameter D2m of the image side of the second spacer P2, and the outer diameter D3m of the image side of the third spacer P3. All parameters shown in Table 9 are in millimeters (mm), and the schematic diagrams of each parameter in the imaging lens structure are as follows: Figure 1 As shown.

[0184] Figure 26 The on-axis chromatic aberration curves of the imaging lenses of Embodiments 10, 11 and 12 are shown, which represent the deviation of light of different wavelengths from the convergence focal point after passing through the lens. Figure 27 The astigmatism curves of the imaging lenses of Examples 10, 11 and 12 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 28 The distortion curves of the imaging lenses of Examples 10, 11 and 12 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 29 The magnification chromatic aberration curves of the imaging lenses of Embodiments 10, 11, and 12 are shown, representing the deviations in image height at different points on the imaging plane after light passes through the lens. According to... Figures 26 to 29 It can be seen that the imaging lenses given in Examples 10, 11 and 12 can achieve good imaging quality.

[0185]

[0186] Table 9

[0187] Furthermore, in Examples 1 to 12, the effective focal length f of the imaging lens, the effective focal length values ​​f1 to f8 of each lens, half the diagonal length ImgH of the effective pixel area on the imaging plane, the maximum effective radius DT11 of the object side of the first lens, the maximum effective radius DT41 of the object side of the fourth lens, the maximum effective radius DT82 of the image side of the eighth lens, the axial distance SAG31 from the intersection of the object side of the third lens and the optical axis to the vertex of the effective radius of the object side of the third lens, the axial distance SAG22 from the intersection of the image side of the second lens and the optical axis to the vertex of the effective radius of the image side of the second lens, and the axial distance SAG52 from the intersection of the image side of the fifth lens and the optical axis to the vertex of the effective radius of the image side of the fifth lens are shown in Table 10 below.

[0188]

[0189]

[0190] Table 10

[0191] Examples 1 to 12 respectively satisfy the conditions shown in Table 11 below.

[0192] Conditional / Example 1 2 3 4 5 6 7 8 9 10 11 12 L / ImgH 1.28 1.28 1.28 1.05 1.05 1.05 1.10 1.10 1.10 1.08 1.08 1.08 f3 / R5 -18.78 -18.78 -18.78 -8.77 -8.77 -8.77 -27.02 -27.02 -27.02 -8.61 -8.61 -8.61 (SAG31+T23) / (EP23+CP2) -0.09 -0.09 -0.09 0.02 0.02 0.03 -0.10 -0.16 -0.16 -0.04 -0.04 -0.08 D0m-D0s 1.54 1.54 1.54 1.49 2.94 2.94 1.19 1.19 3.85 1.19 2.99 2.99 d0s / DT11+d0m / DT82 5.27 5.27 5.27 5.02 5.02 5.02 4.94 4.94 4.94 5.33 5.33 5.33 (d0m-D7s) / (T78-CT8) 0.73 0.73 0.73 1.25 1.58 1.58 1.07 1.07 1.07 1.07 1.07 1.07 SAG22 / CP2 -7.16 -7.16 -7.16 -3.23 -3.23 -3.23 -7.53 -7.53 -7.53 -5.83 -5.83 -5.83 SAG52 / CP5 5.45 5.45 5.45 5.32 5.32 5.32 9.03 9.03 9.03 8.95 8.95 8.95 (EP23+EP34) / T34 12.09 12.09 12.09 12.24 12.24 12.25 14.31 14.27 14.28 12.88 12.88 12.92 (D1s-d1s) / ImgH 0.96 0.49 0.49 0.93 0.71 0.69 0.94 0.93 0.48 1.02 0.66 0.64 f4x(D3m-d3m) / (R7xDT41) -3.22 -2.62 -1.68 -5.06 -3.79 -3.77 -4.87 -4.74 -2.37 -3.90 -2.44 -2.44 (D2m-d2m) / DT22 3.21 1.63 1.63 3.48 2.63 2.56 3.12 3.06 1.58 3.83 2.46 2.39 d5s / R10 0.39 0.39 0.39 0.47 0.47 0.47 0.63 0.63 0.63 0.54 0.54 0.54 d6s / R12 0.09 0.09 0.09 0.29 0.29 0.29 0.23 0.23 0.23 0.20 0.20 0.20 (R6+R7) / EP34 7.68 7.68 7.68 5.83 5.83 4.41 5.61 4.24 4.24 7.04 7.04 4.95

[0193] Table 11

[0194] This application also provides an imaging device equipped with an electronic photosensitive element for imaging. The electronic photosensitive element can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS) device. The imaging device can be a standalone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the imaging lens described above.

[0195] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of protection involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the concept of this application. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An imaging lens, characterized in that, The lens includes a lens barrel and a lens group housed in the lens barrel and at least one spacer element, wherein the lens group 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 arranged sequentially along the optical axis from the object side to the image side; in, The first lens has positive optical power, and its object side is convex and its image side is concave. The second lens has positive optical power, with its object side being convex and its image side being concave. The third lens has positive optical power, with its object side being concave and its image side being convex. The fourth lens has negative optical power, and its object side is convex while its image side is concave. The fifth lens has positive optical power, and its object side is convex while its image side is concave. The sixth lens has negative optical power, and its object side is concave, as is its image side; The seventh lens has positive optical power, and its object side is convex, as is its image side; The eighth lens has negative optical power and its object side is concave. The imaging lens has eight lenses with optical power. The at least one spacer element includes: a second spacer element located between the second lens and the third lens and in direct contact with the image-side surface of the second lens; a third spacer element located between the third lens and the fourth lens and in direct contact with the image-side surface of the third lens; a sixth spacer element located between the sixth lens and the seventh lens and in direct contact with the image-side surface of the sixth lens; and a seventh spacer element located between the seventh lens and the eighth lens and in direct contact with the image-side surface of the seventh lens. The imaging lens satisfies: 1.0 < L / ImgH < 1.3 -27.02≤f3 / R5≤-8.61, and -0.16≤(SAG31+T23) / (EP23+CP2)≤0.03, Wherein, L is the maximum height of the lens barrel, ImgH is half the diagonal length of the effective pixel area on the imaging surface of the imaging lens, f3 is the effective focal length of the third lens, R5 is the radius of curvature of the object side surface of the third lens, SAG31 is the axial distance from the intersection of the object side surface of the third lens and the optical axis to the vertex of the effective radius of the object side surface of the third lens, T23 is the air gap between the second lens and the third lens on the optical axis, EP23 is the spacing distance between the second spacer element and the third spacer element on the optical axis, and CP2 is the maximum thickness of the second spacer element.

2. The imaging lens according to claim 1, characterized in that, The outer diameter D0m of the image-side end face of the lens barrel closest to the image side and the outer diameter D0s of the object-side end face of the lens barrel closest to the object side satisfy the following: 1.19 mm≤D0m-D0s≤3.85 mm.

3. The imaging lens according to claim 1, characterized in that, The axial 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 satisfies: -7.53≤SAG22 / CP2≤-3.

23.

4. The imaging lens according to claim 1, characterized in that, The at least one spacer element further includes: a fifth spacer element, located between the fifth lens and the sixth lens and in direct contact with the image side of the fifth lens; The axial distance SAG52 from the intersection of the image-side surface of the fifth lens and the optical axis to the vertex of the effective radius of the image-side surface of the fifth lens satisfies the following condition: 5.32≤SAG52 / CP5≤9.

03.

5. The imaging lens according to claim 1, characterized in that, The at least one spacer element further includes: a fourth spacer element located between the fourth lens and the fifth lens and in direct contact with the image side of the fourth lens; The spacing EP34 between the third and fourth spacer elements on the optical axis and the air gap T34 between the third and fourth lenses on the optical axis satisfy the following: 12.09≤(EP23+EP34) / T34≤14.

31.

6. The imaging lens according to claim 1, characterized in that, The inner diameter d6s of the object side of the sixth spacer element and the radius of curvature R12 of the image side of the sixth lens satisfy the following: 0.09≤d6s / R12≤0.

29.

7. The imaging lens according to claim 1, characterized in that, The at least one spacer element further includes: a first spacer element located between the first lens and the second lens and in direct contact with the image side of the first lens; The outer diameter D1s of the object side of the first spacer element and the inner diameter d1s of the object side of the first spacer element satisfy the following: 0.48≤(D1s-d1s) / ImgH≤1.

02.

8. The imaging lens according to claim 1, characterized in that, The inner diameter d0m of the image-side end face of the lens barrel closest to the image side, the outer diameter D7s of the object-side surface of the seventh spacer element, the air gap T78 between the seventh lens and the eighth lens on the optical axis, and the center thickness CT8 of the eighth lens on the optical axis satisfy the following: 0.73≤(d0m-D7s) / (T78-CT8)≤1.

58.

9. The imaging lens according to any one of claims 1 to 8, characterized in that, The inner diameter d0s of the object-side end face of the lens barrel closest to the object side, the maximum effective radius DT11 of the object-side surface of the first lens, the inner diameter d0m of the image-side end face of the lens barrel closest to the image side, and the maximum effective radius DT82 of the image-side surface of the eighth lens satisfy the following: 4.94≤d0s / DT11+d0m / DT82≤5.

33.

10. The imaging lens according to any one of claims 1 to 8, characterized in that, The effective focal length f4 of the fourth lens, the outer diameter D3m of the image-side surface of the third spacer element, the inner diameter d3m of the image-side surface of the third spacer element, the radius of curvature R7 of the object-side surface of the fourth lens, and the maximum effective radius DT41 of the object-side surface of the fourth lens satisfy the following: -5.06≤f4×(D3m-d3m) / (R7×DT41)≤-1.

68.

11. The imaging lens according to any one of claims 1 to 8, characterized in that, The outer diameter D2m of the image-side surface of the second spacer element, the inner diameter d2m of the image-side surface of the second spacer element, and the maximum effective radius DT22 of the image-side surface of the second lens satisfy the following: 1.58≤(D2m-d2m) / DT22≤3.

83.

12. The imaging lens according to any one of claims 1 to 8, characterized in that, The at least one spacer element further includes: a fifth spacer element, located between the fifth lens and the sixth lens and in direct contact with the image side of the fifth lens; The inner diameter d5s of the object side of the fifth spacer element and the radius of curvature R10 of the image side of the fifth lens satisfy the following: 0.39≤d5s / R10≤0.

63.

13. The imaging lens according to any one of claims 1 to 8, characterized in that, The at least one spacer element further includes: a fourth spacer element located between the fourth lens and the fifth lens and in direct contact with the image side of the fourth lens; The radius of curvature R6 of the image side of the third lens, the radius of curvature R7 of the object side of the fourth lens, and the spacing EP34 between the third and fourth spacers on the optical axis satisfy the following: 4.24≤(R6+R7) / EP34≤7.68.

Images