An optical imaging lens

Abstract

The application discloses an optical imaging system, comprising a lens barrel and a lens assembly assembled in the lens barrel, the lens assembly is sequentially provided with 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 along an optical axis from an object side to an image side; the inner diameter of the inner wall of the lens barrel increases from an object side end to an imaging end; the fifth lens and the seventh lens have opposite signs of optical power; at least two lenses among the second lens to the seventh lens have negative optical power; the object side surface of the second lens, the third lens, the fourth lens and the fifth lens are all convex surfaces; a spacing element P1 and a spacing element P2 are sequentially arranged between the first lens and the second lens. The outer diameter D1s of the spacing element P1 close to the object side end, the inner diameter d2s of the spacing element P2 close to the object side end, the distance EP01 of the object side end surface of the lens barrel to the spacing element P1 on the optical axis and the central thickness CT1 of the first lens on the optical axis satisfy: 17 < D1s / EP01 + d2s / CT1 < 23.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of optical imaging, and particularly relates to an optical imaging system comprising eight lenses. BACKGROUND

[0002] In recent years, with the progress of science and technology, smart phones have been continuously iterated and developed, and the camera technology of the smart phones is an important part of the smart phone technology, and the imaging performance of the smart phones has been continuously improved. At present, the main camera lens of the mainstream smart phones will select a multi-lens wide-angle lens with high imaging performance, and the wide-angle lens has the characteristics of high imaging quality and large field of view, which is also a difficulty in the design and manufacture of the main camera wide-angle lens.

[0003] The reasonable cooperation between the spacing element and the lens barrel structure and the lens is also a key to guarantee the optical imaging quality. Unreasonable setting of the spacing element is easy to cause unstable assembly. In addition, the wide-angle lens is more prone to stray light. In order to reduce the influence of stray light, the spacing element needs to be added between adjacent lenses, and the size and shape of the spacing element are reasonably set, which can effectively reduce or eliminate the stray light and improve the low yield problem caused by the cooperation amount, thereby improving the imaging quality of the lens. SUMMARY

[0004] The present application aims to provide an optical imaging lens with eight lenses, which has a large range of incident angles, and the span of each gear of each lens and the lens barrel is relatively uniform, which can enhance the ability of light convergence and improve the imaging quality.

[0005] The present application provides an optical imaging lens, which comprises a lens barrel and a lens group assembled in the lens barrel. The lens group is sequentially provided with a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens from a subject side end to an imaging end. The lens group is in abutment with an inner wall of the lens barrel, and the aperture of the inner wall of the lens barrel increases sequentially from the subject side end to the imaging end. The fifth lens and the seventh lens have opposite signs of optical power. The first lens and the second lens are sequentially provided with a spacing element P1 and a spacing element P2. The spacing element P1 is partially in contact with the image side end of the first lens. The spacing element P2 is partially in contact with the subject side end of the second lens. The outer diameter D1s of the spacing element P1 close to the subject side end, the inner diameter d2s of the spacing element P2 close to the subject side end, the distance EP01 of the subject side end surface of the lens barrel to the spacing element P1 on the optical axis, and the central thickness CT1 of the first lens on the optical axis satisfy: 17 < D1s / EP01 + d2s / CT1 < 23.

[0006] According to an embodiment of the present application, a spacer element P3 is arranged between the second lens and the third lens; wherein the radius of curvature R1 of the object side surface of the first lens, the inner diameter ds of the end of the lens barrel close to the object side, the distance EP23 between the spacer element P2 and the spacer element P3, and the air interval T23 of the second lens and the third lens on the optical axis satisfy: 5.5<|R1 / (ds / 2)|+EP23 / T23<9.5.

[0007] According to an embodiment of the present application, a spacer element P3 is arranged between the second lens and the third lens, and a spacer element P4 is arranged between the third lens and the fourth lens; wherein the radius of curvature R6 of the image side surface of the third lens, the air interval T34 of the third lens and the fourth lens on the optical axis, the central thickness CT4 of the fourth lens on the optical axis, and the outer diameter D4s of the end of the spacer element P4 close to the object side satisfy: 23<R6 / T34+D4s / CT4<34.

[0008] According to an embodiment of the present application, the on-axis distance TD from the object side surface of the first lens to the image side surface of the eighth lens, and the maximum thickness CPmax of all spacer elements satisfy: 4.5<TD / CPmax<10.5.

[0009] According to an embodiment of the present application, a spacer element P7 and a spacer element P8 are arranged between the fifth lens and the sixth lens in sequence; the spacer element P7 is in partial contact with the image side end of the fifth lens; the spacer element P8 is in partial contact with the object side end of the sixth lens; wherein the outer diameter D8s of the end of the spacer element P8 close to the object side, the inner diameter d8s of the end of the spacer element P8 close to the object side, the radius of curvature R11 of the object side surface of the sixth lens, and the radius of curvature R12 of the image side surface of the sixth lens satisfy: 2.0<(|D8s / R12|-|d8s / R11|)×fno<4.0.

[0010] According to an embodiment of the present application, a spacer element P10 is arranged between the seventh lens and the eighth lens, and a spacer element P11 is arranged at the image side end of the eighth lens; wherein the outer diameter D10m of the end of the spacer element P10 close to the image side, the distance EP1011 between the spacer element P10 and the spacer element P11, the outer diameter D0m of the imaging end of the lens barrel, and the maximum effective radius SD82 of the image side surface of the eighth lens satisfy: 10.0<D10m / EP1011+D0M / SD82<12.5.

[0011] According to one embodiment of the present application, a spacer element P7 and a spacer element P8 are sequentially arranged between the fifth lens and the sixth lens, and a spacer element P9 is arranged between the sixth lens and the seventh lens; the spacer element P7 is in contact with the image-side end portion of the fifth lens; the spacer element P8 is in contact with the object-side end portion of the sixth lens; wherein the maximum thickness CP8 of the spacer element P8, the distance EP89 between the spacer element P8 and the spacer element P9, the central thickness CT6 of the sixth lens on the optical axis, the air separation T56 of the fifth lens and the sixth lens on the optical axis, the curvature radius R12 of the image-side surface of the sixth lens, and the outer diameter D7s of the spacer element P7 close to the object-side end portion satisfy: 4.0 < (CP8 + EP89) / (CT6 - T56) + |D7s / R12| < 6.5.

[0012] According to one embodiment of the present application, a spacer element P4 is arranged between the third lens and the fourth lens, and a spacer element P5 is arranged at the image-side end portion of the fifth lens; wherein the central thickness CT3 of the third lens on the optical axis, the central thickness CT4 of the fourth lens on the optical axis, the air separation T34 of the third lens and the fourth lens on the optical axis, the distance EP45 between the spacer element P4 and the spacer element P5, and the outer diameter D4s of the spacer element P4 close to the object-side end portion satisfy: 8.0 < CT4 / EP45 + D4s / (CT3 + T34) < 19.0.

[0013] According to one embodiment of the present application, the object-side surface of the first lens is a concave surface, and the image-side surface is a convex surface; the object-side surface of the third lens is a convex surface, and the image-side surface is a concave surface.

[0014] The application also provides an optical imaging lens, comprising a lens barrel and a lens group assembled in the lens barrel, the lens group is sequentially provided with a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens from an object side end to an imaging end; the lens group is in contact with an inner wall of the lens barrel, and an aperture of the inner wall of the lens barrel increases sequentially from the object side end to the imaging end; wherein at least two lenses among the second lens to the seventh lens have negative focal lengths; the fifth lens and the seventh lens have opposite focal lengths; the object side surface of the first lens is a concave surface, and the image side surface is a convex surface; the object side surface of the third lens is a convex surface, and the image side surface is a concave surface; a spacing element P1 and a spacing element P2 are arranged between the first lens and the second lens; a spacing element P3 is arranged between the second lens and the third lens; a spacing element P4 is arranged between the third lens and the fourth lens; a spacing element P5 and a spacing element P6 are arranged between the fourth lens and the fifth lens; a spacing element P7 and a spacing element P8 are arranged between the fifth lens and the sixth lens; a spacing element P9 is arranged between the sixth lens and the seventh lens; a spacing element P10 is arranged between the seventh lens and the eighth lens; an image side end of the eighth lens is provided with a spacing element P11; wherein an outer diameter D10m of the spacing element P10 close to the image side end, a distance EP1011 between the spacing element P10 and the spacing element P11, an outer diameter D0m of the imaging end of the lens barrel and a maximum effective radius SD82 of the image side surface of the eighth lens satisfy: 10.0 < D10m / EP1011+D0M / SD82 < 12.5.

[0015] According to one embodiment of the application, at least two spacing elements P1 and P2 are arranged between the first lens and the second lens; wherein an outer diameter D1s of the spacing element P1 close to the object side end, an inner diameter d2s of the spacing element P2 close to the object side end, a distance EP01 from the object side end of the lens barrel to the spacing element P1 on the optical axis and a central thickness CT1 of the first lens on the optical axis satisfy: 17 < D1s / EP01+d2s / CT1 < 23.

[0016] According to one embodiment of the application, at least two spacing elements P1 and P2 are arranged between the first lens and the second lens; a curvature radius R1 of the object side surface of the first lens, an inner diameter ds of the end close to the object side of the lens barrel, a distance EP23 between the spacing element P2 and the spacing element P3 and an air spacing T23 of the second lens and the third lens on the optical axis satisfy: 5.5 < |R1 / (ds / 2)|+EP23 / T23 < 9.5.

[0017] According to an embodiment of the present application, the radius of curvature R6 of the image side surface of the third lens, the air separation T34 of the third lens and the fourth lens on the optical axis, the central thickness CT4 of the fourth lens on the optical axis, and the outer diameter D4s of the spacer element P4 near the object side end satisfy: 23 < R6 / T34 + D4s / CT4 < 34.

[0018] According to an embodiment of the present application, the on-axis distance TD of the object side surface of the first lens to the image side surface of the eighth lens, and the maximum thickness CPmax of all the spacer elements satisfy: 4.5 < TD / CPmax < 10.5.

[0019] According to an embodiment of the present application, at least two spacer elements P7 and P8 are arranged between the fifth lens and the sixth lens; the outer diameter D8s of the spacer element P8 near the object side end, the inner diameter d8s of the spacer element P8 near the object side end, the radius of curvature R11 of the object side surface of the sixth lens, and the radius of curvature R12 of the image side surface of the sixth lens satisfy: 2.0 < (|D8s / R12| - |d8s / R11|) x fno < 4.0.

[0020] According to an embodiment of the present application, at least two spacer elements P7 and P8 are arranged between the fifth lens and the sixth lens; the maximum thickness CP8 of the spacer element P8, the distance EP89 between the spacer element P8 and the spacer element P9, the central thickness CT6 of the sixth lens on the optical axis, the air separation T56 of the fifth lens and the sixth lens on the optical axis, the radius of curvature R12 of the image side surface of the sixth lens, and the outer diameter D7s of the spacer element P7 near the object side end satisfy: 4.0 < (CP8 + EP89) / (CT6 - T56) + |D7s / R12| < 6.5.

[0021] According to an embodiment of the present application, the central thickness CT3 of the third lens on the optical axis, the central thickness CT4 of the fourth lens on the optical axis, the air separation T34 of the third lens and the fourth lens on the optical axis, the distance EP45 between the spacer element P4 and the spacer element P5, and the outer diameter D4s of the spacer element P4 near the object side end satisfy: 8.0 < CT4 / EP45 + D4s / (CT3 + T34) < 19.0.

[0022] Advantages of the present application:

[0023] The optical imaging lens provided in the application comprises multiple lenses, such as a first lens to an eighth lens, by reasonably controlling the mutual relationship between the outer diameter of a spacing element P1 close to the object side, the inner diameter of a spacing element P2 close to the object side, the distance from the object side end surface of the lens barrel to the first spacing element parallel to the optical axis, and the central thickness of the first lens on the optical axis, the incident light rays can be convergent from the first lens to the second lens, the different sizes of the spacing element P1 and the spacing element P2 arranged between the first lens and the second lens are beneficial to the assembly stability of the first lens and the second lens, thereby improving the low yield problem caused by the matching amount, and meanwhile, it is helpful to reasonably distribute the optical power and improve the imaging quality of the optical system.

[0024] The technical scheme of the application is helpful to improve the assembly stability of the front end lens, improve the low yield problem caused by the matching amount, and improve the imaging quality of the optical system. The performance upper limit of the optical system is improved, the wall thickness of each spacing element is ensured, thereby improving the uniformity of the spacing element and the overall structural strength, meanwhile, it is helpful to control the size of the spacing element, block stray light, and improve the imaging quality. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0026] Figure 1 It is a lens group structure schematic diagram of the optical imaging lens embodiment 1 of the application.

[0027] Figures 2a-2b It is astigmatic curve and magnification chromatic aberration curve of the optical imaging lens embodiment 1 of the application respectively.

[0028] Figure 3 It is a lens group structure schematic diagram of the optical imaging lens embodiment 2 of the application.

[0029] Figures 4a-4b It is astigmatic curve and magnification chromatic aberration curve of the optical imaging lens embodiment 2 of the application respectively.

[0030] Figure 5 It is a lens group structure schematic diagram of the optical imaging lens embodiment 3 of the application.

[0031] Figures 6a-6b It is astigmatic curve and magnification chromatic aberration curve of the optical imaging lens embodiment 3 of the application respectively.

[0032] Figure 7Figure 6 is a lens arrangement schematic view of the optical imaging lens embodiment 4 of the present application;

[0033] Figures 8a-8b Figure 7 and Figure 8 are astigmatism curve and lateral chromatic aberration curve of the optical imaging lens embodiment 4 of the present application, respectively;

[0034] Figure 9 Figure 9 is a lens arrangement schematic view of the optical imaging lens embodiment 5 of the present application;

[0035] Figures 10a-10b Figure 10 and Figure 11 are astigmatism curve and lateral chromatic aberration curve of the optical imaging lens embodiment 5 of the present application, respectively;

[0036] Figure 11 Figure 12 is a lens arrangement schematic view of the optical imaging lens embodiment 6 of the present application;

[0037] Figures 12a-12b Figure 13 and Figure 14 are astigmatism curve and lateral chromatic aberration curve of the optical imaging lens embodiment 6 of the present application, respectively;

[0038] Figure 13 Figure 15 is a size definition schematic view of the optical imaging lens of the present application. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0040] It should be noted that in the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.

[0041] It should also be understood that the words "comprise", "comprising", "have", "having", "contain", "containing", and / or "include", when used in this specification, indicate the presence of the stated features, elements and / or components but do not preclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of" appear after a list of enumerated features, the expression is intended to mean that the list of enumerated features is modified to include at least one of the features, but not the individual elements in the list. In addition, when describing the embodiments of the present application, the word "may" means "one or more embodiments of the present application". And the word "exemplary" is intended to mean example or illustration.

[0042] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not strictly to scale.

[0043] In the description of this application, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region. If the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0044] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formalized manner unless expressly so specified herein.

[0045] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The features, principles, and other aspects of this application will now be described in detail with reference to the accompanying drawings and embodiments.

[0046] Exemplary Implementation

[0047] See attached document Figure 13 The diagram shows the dimensional definition of the optical imaging lens of this application. The optical imaging lens of an exemplary embodiment of this application includes eight lenses, which are sequentially arranged along the optical axis from the object side to the image side as follows: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, wherein each lens is independent of the others and there is an air gap between each lens on the optical axis.

[0048] In this exemplary embodiment, the optical imaging lens includes a lens barrel and a lens group assembled within the lens barrel. The lens group consists of 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 from the object-side end to the imaging end. The lens group abuts against the inner wall of the lens barrel, and the inner diameter of the inner wall of the lens barrel increases sequentially from the object-side end to the imaging end. The fifth lens and the seventh lens have optical powers with opposite signs. A spacer element P1 and a spacer element P2 are arranged sequentially between the first lens and the second lens. The spacer element P1 is in contact with the image-side end of the first lens, and the spacer element P2 is in contact with the object-side end of the second lens.

[0049] In the present exemplary embodiment, the outer diameter D1s of the spacer element P1 near the object side end, the inner diameter d2s of the spacer element P2 near the object side end, the distance EP01 of the barrel object side end surface to the spacer element P1 on the optical axis, and the central thickness CT1 of the first lens on the optical axis satisfy: 17 < D1s / EP01 + d2s / CT1 < 23. By controlling the conditional expression within a reasonable range, it helps to improve the stability of the front lens group, improve the yield problem caused by the fit-up amount, and at the same time helps to reasonably allocate the optical power and improve the imaging quality of the optical system. More specifically, the outer diameter D1s of the spacer element P1 near the object side end, the inner diameter d2s of the spacer element P2 near the object side end, the distance EP01 of the barrel object side end surface to the spacer element P1 on the optical axis, and the central thickness CT1 of the first lens on the optical axis satisfy: 17.01 < D1s / EP01 + d2s / CT1 < 22.99.

[0050] In the present exemplary embodiment, a spacer element P3 is arranged between the second lens and the third lens of the optical imaging lens. The curvature radius R1 of the object side surface of the first lens, the inner diameter ds of the barrel near the object side end, the distance EP23 between the spacer element P2 and the spacer element P3, and the air gap T23 of the second lens and the third lens on the optical axis satisfy: 5.5 < |R1 / (ds / 2)| + EP23 / T23 < 9.5. By controlling the conditional expression within a reasonable range, it can be ensured that the incident light rays show a diverging trend after passing through the first lens, the second lens and the third lens, and are uniformly incident on the fourth lens to realize convergence. The first lens and the second lens are close to each other on the optical axis and protrude towards each other, which also helps to reduce the generation of stray light and improve the imaging quality. More specifically, the curvature radius R1 of the object side surface of the first lens, the inner diameter ds of the barrel near the object side end, the distance EP23 between the spacer element P2 and the spacer element P3, and the air gap T23 of the second lens and the third lens on the optical axis satisfy: 5.51 < |R1 / (ds / 2)| + EP23 / T23 < 9.49.

[0051] In the present exemplary embodiment, a spacer element P3 is arranged between the second lens and the third lens of the optical imaging lens. A spacer element P4 is arranged between the third lens and the fourth lens. The third lens has a curvature radius R6 on the image side, the third lens and the fourth lens have an air separation T34 on the optical axis, the fourth lens has a central thickness CT4 on the optical axis, and the spacer element P4 has an outer diameter D4s close to the object side end. The following condition is satisfied: 23 < R6 / T34 + D4s / CT4 < 34. By controlling the condition within a reasonable range, the thickness of the fourth lens, the air separation between the third lens and the fourth lens can be controlled; the larger the separation, the easier the selection of the spacer element, the greater the stray light improvement space, and the improvement of the overall stray light quality of the lens is beneficial. More specifically, a spacer element P4 is arranged between the third lens and the fourth lens. The third lens has a curvature radius R6 on the image side, the third lens and the fourth lens have an air separation T34 on the optical axis, the fourth lens has a central thickness CT4 on the optical axis, and the spacer element P4 has an outer diameter D4s close to the object side end. The following condition is satisfied: 23.01 < R6 / T34 + D4s / CT4 < 33.99.

[0052] In the present exemplary embodiment, the axial distance TD from the object side surface of the first lens to the image side surface of the eighth lens and the maximum thickness CPmax of all spacer elements satisfy the following condition: 4.5 < TD / CPmax < 10.5. By controlling the condition within a reasonable range, the total length of the lens can be controlled, and at the same time, the spacing between the surfaces of the lenses can be reasonably controlled to avoid excessive deflection of light, while reducing the processing difficulty of the camera lens group. More specifically, the axial distance TD from the object side surface of the first lens to the image side surface of the eighth lens and the maximum thickness CPmax of all spacer elements satisfy the following condition: 4.51 < TD / CPmax < 10.49.

[0053] In the present exemplary embodiment, a spacer element P7 and a spacer element P8 are sequentially arranged between the fifth lens and the sixth lens of the optical imaging lens; preferably, the spacer element P7 is in contact with the image-side end portion of the fifth lens; and the spacer element P8 is in contact with the object-side end portion of the sixth lens. The outer diameter D8s of the spacer element P8 near the object-side end, the inner diameter d8s of the spacer element P8 near the object-side end, the radius of curvature R11 of the object-side surface of the sixth lens, and the radius of curvature R12 of the image-side surface of the sixth lens satisfy: 2.0<(|D8s / R12|-|d8s / R11|)×fno<4.0. By controlling the conditional expression within a reasonable range, it can be ensured that the light rays show a diverging trend when passing through the sixth lens, ensuring the rationality of the light ray trend, while controlling the inner diameter of the spacer element P8 near the object-side end, effectively blocking stray light, and improving the imaging quality. More specifically, the outer diameter D8s of the spacer element P8 near the object-side end, the inner diameter d8s of the spacer element P8 near the object-side end, the radius of curvature R11 of the object-side surface of the sixth lens, and the radius of curvature R12 of the image-side surface of the sixth lens satisfy: 2.01<(|D8s / R12|-|d8s / R11|)×fno<3.99.

[0054] In the present exemplary embodiment, a spacer element P10 is arranged between the seventh lens and the eighth lens of the optical imaging lens, and a spacer element P11 is arranged at the image-side end of the eighth lens. The outer diameter D10m of the spacer element P10 near the image-side end, the distance EP1011 between the spacer element P10 and the spacer element P11, the outer diameter D0m of the imaging end of the lens barrel, and the maximum effective radius SD82 of the image-side surface of the eighth lens satisfy: 10.0<D10m / EP1011+D0M / SD82<12.5. By controlling the conditional expression within a reasonable range, the central thickness of the eighth lens on the optical axis can be controlled, and the appropriate stop position can be selected, which can effectively ensure that the optical power of the eighth lens is positive, and can effectively correct the aberrations (such as coma, astigmatism, distortion, and axial chromatic aberration) related to the stop of the optical system. More specifically, the outer diameter D10m of the spacer element P10 near the image-side end, the distance EP1011 between the spacer element P10 and the spacer element P11, the outer diameter D0m of the imaging end of the lens barrel, and the maximum effective radius SD82 of the image-side surface of the eighth lens satisfy: 10.01<D10m / EP1011+D0M / SD82<12.49.

[0055] In the present exemplary embodiment, a spacer element P7 and a spacer element P8 are sequentially disposed between the fifth lens and the sixth lens of the optical imaging lens, and a spacer element P9 is disposed between the sixth lens and the seventh lens; preferably, the spacer element P7 is in partial contact with the image-side end portion of the fifth lens; the spacer element P8 is in partial contact with the object-side end portion of the sixth lens. The maximum thickness CP8 of the spacer element P8, the distance EP89 between the spacer element P8 and the spacer element P9, the central thickness CT6 of the sixth lens on the optical axis, the air gap T56 between the fifth lens and the sixth lens on the optical axis, the radius of curvature R12 of the image-side surface of the sixth lens, and the outer diameter D7s of the spacer element P7 near the object-side end satisfy: 4.0 < (CP8 + EP89) / (CT6 - T56) + |D7s / R12| < 6.5. By controlling this conditional expression within a reasonable range, the optical power can be constrained for reasonable distribution, the upper limit of the performance of the optical system can be improved, the wall thickness of each spacer element can be ensured, thereby improving the uniformity of the spacer element and the overall structural strength. At the same time, it helps to control the size of the spacer element, block stray light, and improve the imaging quality. More specifically, the maximum thickness CP8 of the spacer element P8, the distance EP89 between the spacer element P8 and the spacer element P9, the central thickness CT6 of the sixth lens on the optical axis, the air gap T56 between the fifth lens and the sixth lens on the optical axis, the radius of curvature R12 of the image-side surface of the sixth lens, and the outer diameter D7s of the spacer element P7 near the object-side end satisfy: 4.01 < (CP8 + EP89) / (CT6 - T56) + |D7s / R12| < 6.49.

[0056] In the present exemplary embodiment, a spacer element P4 is disposed between the third lens and the fourth lens of the optical imaging lens, and a spacer element P5 is disposed at the image-side end of the fifth lens. The central thickness CT3 of the third lens on the optical axis, the central thickness CT4 of the fourth lens on the optical axis, the air gap T34 between the third lens and the fourth lens on the optical axis, the distance EP45 between the spacer element P4 and the spacer element P5, and the outer diameter D4s of the spacer element P4 near the object-side end satisfy: 8.0 < CT4 / EP45 + D4s / (CT3 + T34) < 19.0. By controlling this conditional expression within a reasonable range, the forming feasibility of the third lens and the fourth lens can be effectively improved. The distance between the spacer elements can control the edge thickness of the fifth lens, ensure the overall thickness uniformity of the third, fourth, and fifth lenses, improve the assembly stability, and improve the imaging quality of the lens. More specifically, the central thickness CT3 of the third lens on the optical axis, the central thickness CT4 of the fourth lens on the optical axis, the air gap T34 between the third lens and the fourth lens on the optical axis, the distance EP45 between the spacer element P4 and the spacer element P5, and the outer diameter D4s of the spacer element P4 near the object-side end satisfy: 8.01 < CT4 / EP45 + D4s / (CT3 + T34) < 18.99.

[0057] In the present exemplary embodiment, the object side and the image side of the first lens and the object side and the image side of the third lens of the optical imaging lens have opposite face types.

[0058] In the present exemplary embodiment, at least two lenses among the first lens to the fifth lens of the optical imaging lens have negative refractive powers.

[0059] In the present exemplary embodiment, the optical imaging lens comprises a lens barrel and a lens group assembled in the lens barrel, the lens group is sequentially provided with a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens from an object side end to an imaging end; the lens group is in abutment with an inner wall of the lens barrel, and the aperture of the inner wall of the lens barrel increases sequentially from the object side end to the imaging end; at least two lenses among the first lens to the fifth lens have negative refractive powers; at least one spacer element P1 is arranged between the first lens and the second lens; a spacer element P3 is arranged between the second lens and the third lens; a spacer element P4 is arranged between the third lens and the fourth lens; at least one spacer element P5 is arranged between the fourth lens and the fifth lens; at least one spacer element P7 is arranged between the fifth lens and the sixth lens; a spacer element P9 is arranged between the sixth lens and the seventh lens; a spacer element P10 is arranged between the seventh lens and the eighth lens; and a spacer element P11 is arranged at the image side end of the eighth lens. By setting the gear span of each lens cooperated with the lens barrel more uniformly, the light convergence ability can be enhanced, and the imaging quality can be improved.

[0060] In the present exemplary embodiment, two spacer elements P1 and P2 are arranged between the first lens and the second lens of the optical imaging lens. The outer diameter D1s of the spacer element P1 close to the object side end, the inner diameter d2s of the spacer element P2 close to the object side end, the distance EP01 from the position where the lens barrel abuts against the object side end of the first lens to the spacer element P1 and the central thickness CT1 of the first lens on the optical axis satisfy: 17 < D1s / EP01+d2s / CT1 < 23. By controlling the condition formula within a reasonable range, the front lens group stability can be improved, the yield caused by the cooperation amount can be improved, and the refractive power can be reasonably distributed to improve the imaging quality of the optical system. More specifically, the outer diameter D1s of the spacer element P1 close to the object side end, the inner diameter d2s of the spacer element P2 close to the object side end, the distance EP01 from the position where the lens barrel abuts against the object side end of the first lens to the spacer element P1 and the central thickness CT1 of the first lens on the optical axis satisfy: 17.01 < D1s / EP01+d2s / CT1 < 22.99.

[0061] In the present exemplary embodiment, two spacer elements P1 and P2 are arranged between the first lens and the second lens of the optical imaging lens. The radius of curvature R1 of the object side surface of the first lens, the inner diameter ds of the end of the lens barrel close to the object side, the distance EP23 between the spacer element P2 and the spacer element P3, and the air interval T23 of the second lens and the third lens on the optical axis satisfy: 5.5<|R1 / (ds / 2)|+EP23 / T23<9.5. By controlling the conditional expression within a reasonable range, it can be ensured that the incident light rays show a divergent trend after passing through the first lens, the second lens and the third lens, and are uniformly incident on the fourth lens to achieve convergence. The small interval between the first lens and the second lens on the optical axis and the opposite convexity also help to reduce the generation of stray light and improve the imaging quality. More specifically, the radius of curvature R1 of the object side surface of the first lens, the inner diameter ds of the end of the lens barrel close to the object side, the distance EP23 between the spacer element P2 and the spacer element P3, and the air interval T23 of the second lens and the third lens on the optical axis satisfy: 5.51<|R1 / (ds / 2)|+EP23 / T23<9.49.

[0062] In the present exemplary embodiment, the radius of curvature R6 of the image side surface of the third lens, the air interval T34 of the third lens and the fourth lens on the optical axis, the central thickness CT4 of the fourth lens on the optical axis, and the outer diameter D4s of the end of the spacer element P4 close to the object side satisfy: 23<R6 / T34+D4s / CT4<34. By controlling the conditional expression, it is helpful to control the thickness of the fourth lens and the air interval of the third lens and the fourth lens; the larger the interval, the easier the selection of the spacer element, the greater the improvement of stray light, and it is beneficial to improve the overall stray light quality of the lens. More specifically, the radius of curvature R6 of the image side surface of the third lens, the air interval T34 of the third lens and the fourth lens on the optical axis, the central thickness CT4 of the fourth lens on the optical axis, and the outer diameter D4s of the end of the spacer element P4 close to the object side satisfy: 23.01<R6 / T34+D4s / CT4<33.99.

[0063] In the present exemplary embodiment, the axial distance TD from the object side surface of the first lens to the image side surface of the eighth lens and the maximum thickness CPmax of the spacer elements satisfy: 4.5<TD / CPmax<10.5. By controlling the conditional expression within a reasonable range, the total length of the lens can be controlled, and at the same time, the interval between the surfaces of the lenses can be reasonably controlled to avoid excessive deflection of light rays and reduce the processing difficulty of the camera lens group. More specifically, the axial distance TD from the object side surface of the first lens to the image side surface of the eighth lens and the maximum thickness CPmax of the spacer elements satisfy: 4.51<TD / CPmax<10.49.

[0064] In the present exemplary embodiment, the outer diameter D8s of the spacer element P8 near the object side, the inner diameter d8s of the spacer element P8 near the object side, the radius of curvature R11 of the object side surface of the sixth lens, and the radius of curvature R12 of the image side surface of the sixth lens satisfy: 2.0<(|D8s / R12|-|d8s / R11|) x fno<4.0. By controlling the conditional expression within a reasonable range, the light rays can be ensured to have a divergent trend when passing through the sixth lens, the rationality of the light ray trend is ensured, and the inner diameter of the eighth spacer element near the object side is controlled to effectively block stray light and improve imaging quality. More specifically, the outer diameter D8s of the spacer element P8 near the object side, the inner diameter d8s of the spacer element P8 near the object side, the radius of curvature R11 of the object side surface of the sixth lens, and the radius of curvature R12 of the image side surface of the sixth lens satisfy: 2.01<(|D8s / R12|-|d8s / R11|) x fno<3.99.

[0065] In the present exemplary embodiment, the outer diameter D10m of the spacer element P10 near the image side, the distance EP1011 between the spacer element P10 and the spacer element P11, the outer diameter D0m of the imaging end of the lens barrel, and the maximum effective radius SD82 of the image side surface of the eighth lens satisfy: 10.0<D10m / EP1011+D0M / SD82<12.5. By controlling the conditional expression within a reasonable range, the central thickness of the eighth lens on the optical axis can be controlled, the appropriate stop position can be selected, the optical power of the eighth lens can be effectively ensured to be positive, and the optical system can be effectively corrected for aberrations related to the stop (such as coma, astigmatism, distortion, and axial chromatic aberration). More specifically, the outer diameter D10m of the spacer element P10 near the image side, the distance EP1011 between the spacer element P10 and the spacer element P11, the outer diameter D0m of the imaging end of the lens barrel, and the maximum effective radius SD82 of the image side surface of the eighth lens satisfy: 10.01<D10m / EP1011+D0M / SD82<12.49.

[0066] In the present exemplary embodiment, the maximum thickness CP8 of the spacer element P8, the distance EP89 between the spacer element P8 and the spacer element P9, the central thickness CT6 of the sixth lens on the optical axis, the air separation T56 of the fifth lens and the sixth lens on the optical axis, the radius of curvature R12 of the image side surface of the sixth lens, and the outer diameter D7s of the spacer element P7 close to the object side end satisfy: 4.0 < (CP8 + EP89) / (CT6 - T56) + |D7s / R12| < 6.5. By controlling the conditional expression within a reasonable range, the power distribution can be reasonably constrained, the performance upper limit of the optical system can be improved, the wall thickness of each spacer element can be ensured, thereby improving the uniformity of the spacer element and the overall structural strength, and at the same time, the size of the spacer element can be controlled, stray light can be blocked, and the imaging quality can be improved. More specifically, the maximum thickness CP8 of the spacer element P8, the distance EP89 between the spacer element P8 and the spacer element P9, the central thickness CT6 of the sixth lens on the optical axis, the air separation T56 of the fifth lens and the sixth lens on the optical axis, the radius of curvature R12 of the image side surface of the sixth lens, and the outer diameter D7s of the spacer element P7 close to the object side end satisfy: 4.01 < (CP8 + EP89) / (CT6 - T56) + |D7s / R12| < 6.49.

[0067] In the present exemplary embodiment, the central thickness CT3 of the third lens on the optical axis, the central thickness CT4 of the fourth lens on the optical axis, the air separation T34 of the third lens and the fourth lens on the optical axis, the distance EP45 between the spacer element P4 and the spacer element P5, and the outer diameter D4s of the spacer element P4 close to the object side end satisfy: 8.0 < CT4 / EP45 + D4s / (CT3 + T34) < 19.0. By controlling the conditional expression within a reasonable range, the forming feasibility of the third lens and the fourth lens can be effectively improved, the distance between the spacer elements can control the edge thickness of the fifth lens, the thickness uniformity of the third, fourth, and fifth lenses as a whole can be ensured, the assembly stability can be improved, and the lens imaging quality can be improved. More specifically, the central thickness CT3 of the third lens on the optical axis, the central thickness CT4 of the fourth lens on the optical axis, the air separation T34 of the third lens and the fourth lens on the optical axis, the distance EP45 between the spacer element P4 and the spacer element P5, and the outer diameter D4s of the spacer element P4 close to the object side end satisfy: 8.01 < CT4 / EP45 + D4s / (CT3 + T34) < 18.99.

[0068] In the present exemplary embodiment, the object side surface and the image side surface of the first lens and the object side surface and the image side surface of the third lens have opposite face types.

[0069] In the present exemplary embodiment, the fifth lens and the seventh lens have opposite powers.

[0070] In the present exemplary embodiment, the object side surface and the image side surface of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces, and the surface type x of each aspherical surface can be defined by, but not limited to, the following aspherical surface formula:

[0071]

[0072] wherein x is the sag of the aspherical surface at a position along the optical axis at a height of h from the vertex of the aspherical surface; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the inverse of the radius of curvature R in Table 1); k is the conic constant; and Ai is the correction coefficient of the i-th order of the aspherical surface.

[0073] In the present exemplary embodiment, the optical imaging lens described above can further include a diaphragm. The diaphragm can be disposed at a suitable position as needed, for example, the diaphragm can be disposed between the object side and the first lens. Optionally, the optical imaging lens described above can further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0074] The optical imaging lens according to the above-described embodiments of the present application can employ multiple lenses, for example, the above-described eight lenses. By reasonably allocating the optical power of each lens, the surface type, the central thickness of each lens, and the on-axis distance between each lens, etc., the optical imaging lens has a large imaging image surface, has the characteristics of wide imaging range and high imaging quality, and ensures the ultra-thin nature of the mobile phone.

[0075] In the exemplary embodiments, at least one of the lens surfaces of each lens is an aspherical lens surface, i.e., at least one of the object side surface of the first lens to the image side surface of the eighth lens is an aspherical lens surface. The aspherical lens has the characteristic that the curvature continuously changes from the center of the lens to the periphery of the lens, which is different from the spherical lens having a constant curvature from the center of the lens to the periphery of the lens. The aspherical lens has better radius of curvature characteristics, has the advantages of improving the distortion aberration and improving the astigmatism aberration. After using the aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of the object side surface and the image side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens is an aspherical lens surface. Optionally, the object side surface and the image side surface of each lens of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens are aspherical lens surfaces.

[0076] However, those skilled in the art will understand that the number of lenses constituting the optical imaging lens can be changed without departing from the technical solutions claimed in the present application, to obtain the various results and advantages described in the present specification. For example, although eight lenses are described as an example in the embodiments, the optical imaging lens is not limited to including eight lenses, and the optical imaging lens can also include other numbers of lenses if necessary.

[0077] The specific embodiments of the optical imaging lens suitable for the above-described embodiments are further described below with reference to the accompanying drawings. Specific Embodiment 1

[0079] Figure 1 The lens group structure diagram of the optical imaging lens embodiment 1 of the present application is shown in FIG. 1. The optical imaging lens includes, in order from the object side to the image side along the optical axis, a stop STO, 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, an eighth lens E8, a filter E9, and an imaging surface S19.

[0080] The first lens E1 has positive refractive power, and its object side surface S1 is a concave surface and its image side surface S2 is a convex surface. The second lens E2 has negative refractive power, and its object side surface S3 is a convex surface and its image side surface S4 is a concave surface. The third lens E3 has negative refractive power, and its object side surface S5 is a convex surface and its image side surface S6 is a concave surface. The fourth lens E4 has positive refractive power, and its object side surface S7 is a convex surface and its image side surface S8 is a convex surface. The fifth lens E5 has negative refractive power, and its object side surface S9 is a convex surface and its image side surface S10 is a concave surface. The sixth lens E6 has positive refractive power, and its object side surface S11 is a concave surface and its image side surface S12 is a convex surface. The seventh lens E7 has positive refractive power, and its object side surface S13 is a convex surface and its image side surface S14 is a concave surface. The eighth lens E8 has negative refractive power, and its object side surface S15 is a concave surface and its image side surface S16 is a concave surface. The filter E9 has an object side surface S17 and an image side surface S18. Light from an object passes through each of the surfaces S1 to S18 in order and is finally imaged on the imaging surface S19.

[0081] As shown in Table 1, the basic parameter table of the optical imaging lens of embodiment 1 is shown in Table 1, wherein the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm).

[0082]

[0083] Table 1

[0084] As shown in Table 2, in the embodiment 1, the total effective focal length of the optical imaging lens f = 11.40 mm, the distance on the optical axis from the object side S1 of the first lens E1 to the imaging surface S19 of the optical imaging lens TTL = 14.06 mm, and the half of the diagonal length of the effective pixel area on the imaging surface S17 ImgH = 8.27 mm.

[0085]

[0086] Table 2

[0087] The optical imaging lens in the embodiment 1 satisfies:

[0088] D1s / EP01+d2s / CT1 = 21.95, wherein D1s is the outer diameter of the interval element P1 close to the object side end, d2s is the inner diameter of the interval element P2 close to the object side end, EP01 is the distance on the optical axis from the barrel object side end surface to the interval element P1, and CT1 is the center thickness of the first lens on the optical axis.

[0089] |R1 / (ds / 2)|+EP23 / T23 = 9.27, wherein R1 is the curvature radius of the object side surface of the first lens, ds is the inner diameter of the barrel close to the object side end, EP23 is the distance between the interval element P2 and the interval element P3, and T23 is the air interval of the second lens and the third lens on the optical axis.

[0090] R6 / T34+D4s / CT4 = 33.48, wherein R6 is the curvature radius of the image side surface of the third lens, T34 is the air interval of the third lens and the fourth lens on the optical axis, CT4 is the center thickness of the fourth lens on the optical axis, and D4s is the outer diameter of the interval element P4 close to the object side end.

[0091] TD / CPmax = 10.19, wherein TD is the distance on the axis from the object side surface of the first lens to the image side surface of the eighth lens, CPmax is the maximum thickness of all interval elements, in this embodiment, CP6 is CPmax, and CP6 is the thickness of the interval element P6.

[0092] (|D8s / R12|-|d8s / R11|) x fno = 3.58, wherein D8s is the outer diameter of the interval element P8 close to the object side end, d8s is the inner diameter of the interval element P8 close to the object side end, R11 is the curvature radius of the object side surface of the sixth lens, and R12 is the curvature radius of the image side surface of the sixth lens.

[0093] D10m / EP1011+D0m / SD82=12.26, where D10mis the outer diameter of the spacer element P10 close to the image side end, EP1011is the distance between the spacer element P10 and the spacer element P11, D0mis the outer diameter of the barrel imaging end, and SD82is the maximum effective radius of the image side surface of the eighth lens.

[0094] (CP8+EP89) / (CT6-T56)+|D7s / R12|=5.76, where CP8is the maximum thickness of the spacer element P8, EP89is the distance between the spacer element P8 and the spacer element P9, CT6is the central thickness of the sixth lens on the optical axis, T56is the air separation between the fifth lens and the sixth lens on the optical axis, R12is the radius of curvature of the image side surface of the sixth lens, and D7sis the outer diameter of the spacer element P7 close to the object side end.

[0095] CT4 / EP45+D4s / (CT3+T34)=18.38, where CT3is the central thickness of the third lens on the optical axis, CT4is the central thickness of the fourth lens on the optical axis, T34is the air separation between the third lens and the fourth lens on the optical axis, EP45is the distance between the spacer element P4 and the spacer element P5, and D4sis the outer diameter of the spacer element P4 close to the object side end.

[0096] In the embodiment 1, the object side surface and the image side surface of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces, and Table 3 shows the high order term coefficients A4, A6, A8, A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 , and A 30 , which can be used for the aspherical surfaces S1-S16 in the embodiment 1.

[0097]

[0098]

[0099] Table 3

[0100] Figure 2a The astigmatism curve of the optical imaging lens of the embodiment 1 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 2b The lateral chromatic aberration curve of the optical imaging lens of the embodiment 1 is shown, which represents the deviation of the light rays on the imaging surface at different image heights after passing through the lens. According to the embodiment 1, the lateral chromatic aberration is 0.0003 mm. Figures 2a-2bIt can be seen that the optical imaging lens given in Embodiment 1 can achieve good imaging quality. Specific Embodiment 2

[0102] Figure 3 The lens group structure schematic diagram of the optical imaging lens in Embodiment 2 is shown in FIG. 2. The optical imaging lens sequentially includes, along the optical axis from the object side to the image side: a stop STO, 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, an eighth lens E8, a filter E9, and an imaging surface S19.

[0103] The first lens E1 has positive refractive power, the object side surface S1 is a concave surface, and the image side surface S2 is a convex surface. The second lens E2 has negative refractive power, the object side surface S3 is a convex surface, and the image side surface S4 is a concave surface. The third lens E3 has negative refractive power, the object side surface S5 is a convex surface, and the image side surface S6 is a concave surface. The fourth lens E4 has positive refractive power, the object side surface S7 is a convex surface, and the image side surface S8 is a convex surface. The fifth lens E5 has negative refractive power, the object side surface S9 is a convex surface, and the image side surface S10 is a concave surface. The sixth lens E6 has positive refractive power, the object side surface S11 is a concave surface, and the image side surface S12 is a convex surface. The seventh lens E7 has positive refractive power, the object side surface S13 is a convex surface, and the image side surface S14 is a concave surface. The eighth lens E8 has negative refractive power, the object side surface S15 is a concave surface, and the image side surface S16 is a concave surface. The filter E8 has an object side surface S17 and an image side surface S18. Light from an object sequentially passes through each of the surfaces S1 to S18 and is finally imaged on the imaging surface S19.

[0104] As shown in Table 4, the basic parameter table of the optical imaging lens in Embodiment 2 is shown in Table 4, wherein the units of the curvature radius, the thickness, and the focal length are all millimeters (mm).

[0105]

[0106]

[0107] Table 4

[0108] As shown in Table 5, in Embodiment 2, the total effective focal length of the optical imaging lens f = 11.10 mm, the distance TTL of the optical imaging lens from the object side surface S1 of the first lens E1 to the imaging surface S19 on the optical axis is 13.40 mm, and the half of the diagonal line length of the effective pixel area on the imaging surface S17 ImgH is 8.27 mm.

[0109]

[0110] Table 5

[0111] The optical imaging lens in Embodiment 2 satisfies:

[0112] D1s / EP01+d2s / CT1 = 21.61, where D1s is the outer diameter of the spacer element P1 near the object side end, d2s is the inner diameter of the spacer element P2 near the object side end, EP01 is the distance from the object side end surface of the lens barrel to the spacer element P1 on the optical axis, and CT1 is the center thickness of the first lens on the optical axis.

[0113] |R1 / (ds / 2)|+EP23 / T23 = 9.27, where R1 is the curvature radius of the object side surface of the first lens, ds is the inner diameter of the end of the lens barrel near the object side, EP23 is the distance between the spacer element P2 and the spacer element P3, and T23 is the air interval of the second lens and the third lens on the optical axis.

[0114] R6 / T34+D4s / CT4 = 33.48, where R6 is the curvature radius of the image side surface of the third lens, T34 is the air interval of the third lens and the fourth lens on the optical axis, CT4 is the center thickness of the fourth lens on the optical axis, and D4s is the outer diameter of the spacer element P4 near the object side end.

[0115] TD / CPmax = 9.95, where TD is the distance on the axis from the object side surface of the first lens to the image side surface of the eighth lens, CPmax is the largest thickness among all the spacer elements, and in this embodiment, CP6 is CPmax, and CP6 is the thickness of the spacer element P6.

[0116] (|D8s / R12|-|d8s / R11|)xfno = 3.86, where D8s is the outer diameter of the spacer element P8 near the object side end, d8s is the inner diameter of the spacer element P8 near the object side end, R11 is the curvature radius of the object side surface of the sixth lens, and R12 is the curvature radius of the image side surface of the sixth lens.

[0117] D10m / EP1011+D0M / SD82 = 12.22, where D10m is the outer diameter of the spacer element P10 near the image side end, EP1011 is the distance between the spacer element P10 and the spacer element P11, D0m is the outer diameter of the imaging end of the lens barrel, and SD82 is the maximum effective radius of the image side surface of the eighth lens.

[0118] (CP8+EP89) / (CT6-T56)+|D7s / R12| = 6.02, where CP8 is the maximum thickness of the spacer element P8, EP89 is the distance between the spacer element P8 and the spacer element P9, CT6 is the center thickness of the sixth lens on the optical axis, T56 is the air interval of the fifth lens and the sixth lens on the optical axis, R12 is the curvature radius of the image side surface of the sixth lens, and D7s is the outer diameter of the spacer element P7 near the object side end.

[0119] CT4 / EP45+D4s / (CT3+T34) = 18.46, where CT3 is the center thickness of the third lens on the optical axis, CT4 is the center thickness of the fourth lens on the optical axis, T34 is the air gap of the third lens and the fourth lens on the optical axis, EP45 is the distance between the spacer element P4 and the spacer element P5, and D4s is the outer diameter of the spacer element P4 close to the object side end.

[0120] In embodiment 2, the object side surface and the image side surface of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces, and Table 6 shows the high order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30, A32, A34, and A36 of the aspherical surfaces S1-S16 which can be used in embodiment 2. 10 12 14 16 18 20 22 24 26 28 30 .

[0121]

[0122]

[0123] Table 6

[0124] Figure 4a The astigmatic curve of the optical imaging lens of embodiment 2 is shown, which represents the meridional image surface curvature and the sagittal image surface curvature. Figure 4b The magnification chromatic aberration curve of the optical imaging lens of embodiment 2 is shown, which represents the deviation of light rays at different image heights on the imaging surface after passing through the lens. According to the formula Figures 4a-4b , it can be seen that the optical imaging lens given in embodiment 2 can achieve good imaging quality. Specific embodiment 3

[0126] Figure 5 is a lens group structure schematic diagram of embodiment 3 of the optical imaging lens of the present application, and the optical imaging lens sequentially includes, along the optical axis from the object side to the image side: a stop STO, 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, an eighth lens E8, a filter E9, and an imaging surface S19.

[0127] ​​​​​​​​​​The first lens E1 has positive refractive power, the object side surface S1 is concave, and the image side surface S2 is convex. The second lens E2 has negative refractive power, the object side surface S3 is convex, and the image side surface S4 is concave. The third lens E3 has negative refractive power, the object side surface S5 is convex, and the image side surface S6 is concave. The fourth lens E4 has positive refractive power, the object side surface S7 is convex, and the image side surface S8 is convex. The fifth lens E5 has positive refractive power, the object side surface S9 is convex, and the image side surface S10 is convex. The sixth lens E6 has positive refractive power, the object side surface S11 is concave, and the image side surface S12 is convex. The seventh lens E7 has negative refractive power, the object side surface S13 is convex, and the image side surface S14 is concave. The eighth lens E8 has negative refractive power, the object side surface S15 is convex, and the image side surface S16 is concave. The filter E8 has an object side surface S17 and an image side surface S18. Light from an object sequentially passes through each of the surfaces S1 to S18 and is finally imaged on the imaging surface S19.

[0128] As shown in Table 7, the basic parameter table of the optical imaging lens in Example 3 is shown, wherein the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm).

[0129]

[0130]

[0131] Table 7

[0132] As shown in Table 8, in Example 3, the total effective focal length of the optical imaging lens is f = 9.90 mm, the distance on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S19 of the optical imaging lens is TTL = 12.61 mm, and half of the diagonal length of the effective pixel area on the imaging surface S17 is ImgH = 7.10 mm.

[0133]

[0134] Table 8

[0135] The optical imaging lens in Example 3 satisfies:

[0136] D1s / EP01+d2s / CT1 = 17.88, wherein D1s is the outer diameter of the spacing element P1 close to the object side end, d2s is the inner diameter of the spacing element P2 close to the object side end, EP01 is the distance on the optical axis from the object side end surface of the lens barrel to the spacing element P1, and CT1 is the center thickness of the first lens on the optical axis.

[0137] R1 / (ds / 2) + EP23 / T23 = 6.70, where R1 is the radius of curvature of the object side surface of the first lens, ds is the inner diameter of the barrel near the object side end, EP23 is the distance between the spacer element P2 and the spacer element P3, and T23 is the air separation of the second lens and the third lens on the optical axis.

[0138] R6 / T34 + D4s / CT4 = 27.04, where R6 is the radius of curvature of the image side surface of the third lens, T34 is the air separation of the third lens and the fourth lens on the optical axis, CT4 is the center thickness of the fourth lens on the optical axis, and D4s is the outer diameter of the spacer element P4 near the object side end.

[0139] TD / CPmax = 7.62, where TD is the on-axis distance from the object side surface of the first lens to the image side surface of the eighth lens, CPmax is the thickest one among all the spacer elements, in this embodiment, CPmax is CP6, and CP6 is the thickness of the spacer element P6.

[0140] (|D8s / R12| - |d8s / R11|) x fno = 2.23, where D8s is the outer diameter of the spacer element P8 near the object side end, d8s is the inner diameter of the spacer element P8 near the object side end, R11 is the radius of curvature of the object side surface of the sixth lens, and R12 is the radius of curvature of the image side surface of the sixth lens.

[0141] D10m / EP1011 + D0m / SD82 = 11.99, where D10m is the outer diameter of the spacer element P10 near the image side end, EP1011 is the distance between the spacer element P10 and the spacer element P11, D0m is the outer diameter of the imaging end of the barrel, and SD82 is the maximum effective radius of the image side surface of the eighth lens.

[0142] (CP8 + EP89) / (CT6 - T56) + |D7s / R12| = 5.30, where CP8 is the maximum thickness of the spacer element P8, EP89 is the distance between the spacer element P8 and the spacer element P9, CT6 is the center thickness of the sixth lens on the optical axis, T56 is the air separation of the fifth lens and the sixth lens on the optical axis, R12 is the radius of curvature of the image side surface of the sixth lens, and D7s is the outer diameter of the spacer element P7 near the object side end.

[0143] CT4 / EP45 + D4s / (CT3 + T34) = 11.78, where CT3 is the center thickness of the third lens on the optical axis, CT4 is the center thickness of the fourth lens on the optical axis, T34 is the air separation of the third lens and the fourth lens on the optical axis, EP45 is the distance between the spacer element P4 and the spacer element P5, and D4s is the outer diameter of the spacer element P4 near the object side end.

[0144] In Example 3, the object-side surface and image-side surface of any one of the lenses from the first lens E1 to the eighth lens E8 are aspherical. Table 9 shows the higher-order coefficients A4, A6, A8, and A6 that can be used for each aspherical mirror S1-S16 in Example 3. 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 and A 30 .

[0145]

[0146]

[0147] Table 9

[0148] Figure 6a The astigmatism curve of the optical imaging lens of Embodiment 3 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 6b The magnification chromatic aberration curve of the optical imaging lens of Embodiment 3 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to Figures 6a-6b As shown, the optical imaging lens given in Example 3 can achieve good imaging quality. Specific Implementation Example 4

[0150] Figure 7 This is a schematic diagram of the lens group structure of embodiment 4 of the optical imaging lens of this application. The optical imaging lens includes, in sequence from the object side to the image side along the optical axis: aperture stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, eighth lens E8, filter E9 and imaging surface S19.

[0151] The first lens E1 has positive refractive power, the object side surface S1 is concave, and the image side surface S2 is convex. The second lens E2 has negative refractive power, the object side surface S3 is convex, and the image side surface S4 is concave. The third lens E3 has negative refractive power, the object side surface S5 is convex, and the image side surface S6 is concave. The fourth lens E4 has positive refractive power, the object side surface S7 is convex, and the image side surface S8 is convex. The fifth lens E5 has positive refractive power, the object side surface S9 is convex, and the image side surface S10 is convex. The sixth lens E6 has positive refractive power, the object side surface S11 is concave, and the image side surface S12 is convex. The seventh lens E7 has negative refractive power, the object side surface S13 is convex, and the image side surface S14 is concave. The eighth lens E8 has negative refractive power, the object side surface is convex, and the image side surface is concave. The filter E9 has the object side surface S17 and the image side surface S18. Light from an object sequentially passes through each of the surfaces S1 to S18 and is finally imaged on the imaging surface S19.

[0152] As shown in Table 10, the basic parameter table of the optical imaging lens in Example 4 is shown, wherein the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm).

[0153]

[0154]

[0155] Table 10

[0156] As shown in Table 11, in Example 4, the total effective focal length of the optical imaging lens is f = 9.90 mm, the distance on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S17 of the optical imaging lens is TTL = 12.61 mm, and the half of the diagonal length of the effective pixel area on the imaging surface S17 is ImgH = 7.10 mm.

[0157]

[0158] Table 11

[0159] The optical imaging lens in Example 4 satisfies:

[0160] D1s / EP01+d2s / CT1 = 17.53, wherein D1s is the outer diameter of the spacing element P1 close to the object side end, d2s is the inner diameter of the spacing element P2 close to the object side end, EP01 is the distance on the optical axis from the object side end surface of the lens barrel to the spacing element P1, and CT1 is the center thickness of the first lens on the optical axis.

[0161] R1 / (ds / 2) + EP23 / T23 = 7.15, where R1 is the radius of curvature of the object side surface of the first lens, ds is the inner diameter of the barrel near the object side end, EP23 is the distance between the spacer element P2 and the spacer element P3, and T23 is the air separation of the second lens and the third lens on the optical axis.

[0162] R6 / T34 + D4s / CT4 = 26.37, where R6 is the radius of curvature of the image side surface of the third lens, T34 is the air separation of the third lens and the fourth lens on the optical axis, CT4 is the central thickness of the fourth lens on the optical axis, and D4s is the outer diameter of the spacer element P4 near the object side end.

[0163] TD / CPmax = 8.39, where TD is the on-axis distance from the object side surface of the first lens to the image side surface of the eighth lens, CPmax is the thickest one among all the spacer elements, in this embodiment, CPmax is CP6, which is the thickness of the spacer element P6.

[0164] (|D8s / R12| - |d8s / R11|) x fno = 2.23, where D8s is the outer diameter of the spacer element P8 near the object side end, d8s is the inner diameter of the spacer element P8 near the object side end, R11 is the radius of curvature of the object side surface of the sixth lens, and R12 is the radius of curvature of the image side surface of the sixth lens.

[0165] D10m / EP1011 + D0m / SD82 = 11.95, where D10m is the outer diameter of the spacer element P10 near the image side end, EP1011 is the distance between the spacer element P10 and the spacer element P11, D0m is the outer diameter of the imaging end of the barrel, and SD82 is the maximum effective radius of the image side surface of the eighth lens.

[0166] (CP8 + EP89) / (CT6 - T56) + |D7s / R12| = 5.58, where CP8 is the maximum thickness of the spacer element P8, EP89 is the distance between the spacer element P8 and the spacer element P9, CT6 is the central thickness of the sixth lens on the optical axis, T56 is the air separation of the fifth lens and the sixth lens on the optical axis, R12 is the radius of curvature of the image side surface of the sixth lens, and D7s is the outer diameter of the spacer element P7 near the object side end.

[0167] CT4 / EP45 + D4s / (CT3 + T34) = 10.43, where CT3 is the central thickness of the third lens on the optical axis, CT4 is the central thickness of the fourth lens on the optical axis, T34 is the air separation of the third lens and the fourth lens on the optical axis, EP45 is the distance between the spacer element P4 and the spacer element P5, and D4s is the outer diameter of the spacer element P4 near the object side end.

[0168] In Example 4, the object-side surface and image-side surface of any one of the lenses from the first lens E1 to the eighth lens E8 are aspherical. Table 12 shows the higher-order coefficients A4, A6, A8, and A6 that can be used for each aspherical mirror S1-S16 in Example 4. 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 and A 30 .

[0169]

[0170]

[0171] Table 12

[0172] Figure 8a The astigmatism curve of the optical imaging lens of Embodiment 4 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 8b The magnification chromatic aberration curve of the optical imaging lens of Embodiment 4 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to Figures 8a-8b As shown, the optical imaging lens given in Example 4 can achieve good imaging quality. Specific Implementation Example 5

[0174] Figure 9 This is a schematic diagram of the lens group structure of embodiment 5 of the optical imaging lens of this application. The optical imaging lens includes, in sequence from the object side to the image side along the optical axis: aperture stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, eighth lens E8, filter E9 and imaging surface S19.

[0175] The first lens E1 has positive refractive power, the object side surface S1 is concave, and the image side surface S2 is convex. The second lens E2 has negative refractive power, the object side surface S3 is convex, and the image side surface S4 is concave. The third lens E3 has positive refractive power, the object side surface S5 is convex, and the image side surface S6 is concave. The fourth lens E4 has positive refractive power, the object side surface S7 is convex, and the image side surface S8 is convex. The fifth lens E5 has negative refractive power, the object side surface S9 is convex, and the image side surface S10 is concave. The sixth lens E6 has positive refractive power, the object side surface S11 is concave, and the image side surface S12 is convex. The seventh lens E7 has positive refractive power, the object side surface S13 is convex, and the image side surface S14 is concave. The eighth lens has negative refractive power, the object side surface S15 is convex, and the image side surface S16 is concave. The filter E9 has an object side surface S17 and an image side surface S18. Light from an object sequentially passes through each of the surfaces S1 to S18 and is finally imaged on the imaging surface S19.

[0176] As shown in Table 13, the basic parameter table of the optical imaging lens in Example 5 is shown, wherein the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm).

[0177]

[0178] Table 13

[0179] As shown in Table 14, in Example 5, the total effective focal length of the optical imaging lens is f = 9.51 mm, the distance on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S17 of the optical imaging lens is TTL = 12.24 mm, and half of the diagonal length of the effective pixel area on the imaging surface S17 is ImgH = 7.10 mm.

[0180]

[0181]

[0182] Table 14

[0183] The optical imaging lens in Example 5 satisfies:

[0184] D1s / EP01+d2s / CT1 = 18.68, wherein D1s is the outer diameter of the spacer element P1 close to the object side end, d2s is the inner diameter of the spacer element P2 close to the object side end, EP01 is the distance on the optical axis from the object side end surface of the lens barrel to the spacer element P1, and CT1 is the central thickness of the first lens on the optical axis.

[0185] R1 / (ds / 2) + EP23 / T23 = 6.27, where R1 is the radius of curvature of the object side surface of the first lens, ds is the inner diameter of the barrel near the object side end, EP23 is the distance between the spacer element P2 and the spacer element P3, and T23 is the air separation of the second lens and the third lens on the optical axis.

[0186] R6 / T34 + D4s / CT4 = 24.71, where R6 is the radius of curvature of the image side surface of the third lens, T34 is the air separation of the third lens and the fourth lens on the optical axis, CT4 is the central thickness of the fourth lens on the optical axis, and D4s is the outer diameter of the spacer element P4 near the object side end.

[0187] TD / CPmax = 4.92, where TD is the axial distance from the object side surface of the first lens to the image side surface of the eighth lens, CPmax is the thickest one among all the spacer elements, in this embodiment, CPmax is CP6, which is the thickness of the spacer element P6.

[0188] (|D8s / R12| - |d8s / R11|) x fno = 2.67, where D8s is the outer diameter of the spacer element P8 near the object side end, d8s is the inner diameter of the spacer element P8 near the object side end, R11 is the radius of curvature of the object side surface of the sixth lens, and R12 is the radius of curvature of the image side surface of the sixth lens.

[0189] D10m / EP1011 + D0m / SD82 = 10.17, where D10m is the outer diameter of the spacer element P10 near the image side end, EP1011 is the distance between the spacer element P10 and the spacer element P11, D0m is the outer diameter of the imaging end of the barrel, and SD82 is the maximum effective radius of the image side surface of the eighth lens.

[0190] (CP8 + EP89) / (CT6 - T56) + |D7s / R12| = 4.46, where CP8 is the maximum thickness of the spacer element P8, EP89 is the distance between the spacer element P8 and the spacer element P9, CT6 is the central thickness of the sixth lens on the optical axis, T56 is the air separation of the fifth lens and the sixth lens on the optical axis, R12 is the radius of curvature of the image side surface of the sixth lens, and D7s is the outer diameter of the spacer element P7 near the object side end.

[0191] CT4 / EP45 + D4s / (CT3 + T34) = 9.56, where CT3 is the central thickness of the third lens on the optical axis, CT4 is the central thickness of the fourth lens on the optical axis, T34 is the air separation of the third lens and the fourth lens on the optical axis, EP45 is the distance between the spacer element P4 and the spacer element P5, and D4s is the outer diameter of the spacer element P4 near the object side end.

[0192] In Example 5, the object-side surface and image-side surface of any one of the lenses from the first lens E1 to the eighth lens E8 are aspherical. Table 15 shows the higher-order coefficients A4, A6, A8, and A6 that can be used for each aspherical mirror S1-S16 in Example 5. 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 and A 30 .

[0193]

[0194]

[0195] Table 15

[0196] Figure 10a The astigmatism curve of the optical imaging lens of Embodiment 5 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 10b The magnification chromatic aberration curve of the optical imaging lens of Embodiment 5 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to Figures 10a-10b As can be seen from the figure, the optical imaging lens given in Example 5 can achieve good imaging quality. Specific Implementation Example 6

[0198] Figure 11 This is a schematic diagram of the lens group structure of embodiment 6 of the optical imaging lens of this application. The optical imaging lens includes, in sequence from the object side to the image side along the optical axis: aperture stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, eighth lens E8, filter E9 and imaging surface S19.

[0199] The first lens E1 has positive refractive power, the object side surface S1 is concave, and the image side surface S2 is convex. The second lens E2 has negative refractive power, the object side surface S3 is convex, and the image side surface S4 is concave. The third lens E3 has positive refractive power, the object side surface S5 is convex, and the image side surface S6 is concave. The fourth lens E4 has positive refractive power, the object side surface S7 is convex, and the image side surface S8 is convex. The fifth lens E5 has negative refractive power, the object side surface S9 is convex, and the image side surface S10 is concave. The sixth lens E6 has positive refractive power, the object side surface S11 is concave, and the image side surface S12 is convex. The seventh lens E7 has positive refractive power, the object side surface S13 is convex, and the image side surface S14 is concave. The eighth lens E8 has negative refractive power, the object side surface S15 is convex, and the image side surface S16 is concave. The filter E9 has an object side surface S17 and an image side surface S18. Light from an object sequentially passes through each of the surfaces S1 to S18 and is finally imaged on the imaging surface S19.

[0200] As shown in Table 16, the basic parameter table of the optical imaging lens in Example 6 is shown, wherein the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm).

[0201]

[0202] Table 16

[0203] As shown in Table 17, in Example 6, the total effective focal length of the optical imaging lens is f = 10.88 mm, the distance on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S17 of the optical imaging lens is TTL = 13.33 mm, and half of the diagonal length of the effective pixel area on the imaging surface S17 is ImgH = 8.10 mm.

[0204]

[0205]

[0206] Table 17

[0207] The optical imaging lens in Example 6 satisfies:

[0208] D1s / EP01+d2s / CT1 = 18.06, wherein D1s is the outer diameter of the spacer element P1 close to the object side end, d2s is the inner diameter of the spacer element P2 close to the object side end, EP01 is the distance on the optical axis from the object side end surface of the lens barrel to the spacer element P1, and CT1 is the central thickness of the first lens on the optical axis.

[0209] R1 / (ds / 2) + EP23 / T23 = 5.96, where R1 is the radius of curvature of the object side surface of the first lens, ds is the inner diameter of the barrel near the object side end, EP23 is the distance between the spacer element P2 and the spacer element P3, and T23 is the air separation of the second lens and the third lens on the optical axis.

[0210] R6 / T34 + D4s / CT4 = 23.93, where R6 is the radius of curvature of the image side surface of the third lens, T34 is the air separation of the third lens and the fourth lens on the optical axis, CT4 is the central thickness of the fourth lens on the optical axis, and D4s is the outer diameter of the spacer element P4 near the object side end.

[0211] TD / CPmax = 5.38, where TD is the axial distance from the object side surface of the first lens to the image side surface of the eighth lens, CPmax is the thickest one among all the spacer elements, in this embodiment, CPmax is CP6, and CP6 is the thickness of the spacer element P6.

[0212] (|D8s / R12| - |d8s / R11|) x fno = 2.67, where D8s is the outer diameter of the spacer element P8 near the object side end, d8s is the inner diameter of the spacer element P8 near the object side end, R11 is the radius of curvature of the object side surface of the sixth lens, and R12 is the radius of curvature of the image side surface of the sixth lens.

[0213] D10m / EP1011 + D0m / SD82 = 10.13, where D10m is the outer diameter of the spacer element P10 near the image side end, EP1011 is the distance between the spacer element P10 and the spacer element P11, D0m is the outer diameter of the imaging end of the barrel, and SD82 is the maximum effective radius of the image side surface of the eighth lens.

[0214] (CP8 + EP89) / (CT6 - T56) + |D7s / R12| = 4.58, where CP8 is the maximum thickness of the spacer element P8, EP89 is the distance between the spacer element P8 and the spacer element P9, CT6 is the central thickness of the sixth lens on the optical axis, T56 is the air separation of the fifth lens and the sixth lens on the optical axis, R12 is the radius of curvature of the image side surface of the sixth lens, and D7s is the outer diameter of the spacer element P7 near the object side end.

[0215] CT4 / EP45 + D4s / (CT3 + T34) = 8.16, where CT3 is the central thickness of the third lens on the optical axis, CT4 is the central thickness of the fourth lens on the optical axis, T34 is the air separation of the third lens and the fourth lens on the optical axis, EP45 is the distance between the spacer element P4 and the spacer element P5, and D4s is the outer diameter of the spacer element P4 near the object side end.

[0216] In Example 6, the object-side surface and image-side surface of any one of the lenses from the first lens E1 to the eighth lens E8 are aspherical. Table 18 shows the higher-order coefficients A4, A6, A8, and A6 that can be used for each aspherical mirror S1-S16 in Example 6. 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 and A 30 .

[0217]

[0218] Table 18

[0219] Figure 12a The astigmatism curve of the optical imaging lens of Embodiment 6 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 12b The magnification chromatic aberration curve of the optical imaging lens of Embodiment 6 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to Figures 12a-12b As can be seen from the figure, the optical imaging lens given in Example 6 can achieve good imaging quality.

[0220] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, improvements, or equivalent substitutions made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An optical imaging lens, characterized in that, The system includes a lens barrel and a lens assembly housed within the lens barrel. The lens assembly comprises eight lenses with optical power, arranged sequentially from the object side to the image side along the optical axis. The first lens with positive optical power has a concave object side and a convex image side. A second lens with negative optical power has a convex object side and a concave image side. A third lens with optical power has a convex object side and a concave image side. The fourth lens with positive optical power has a convex object-side surface and a convex image-side surface. The fifth lens, which has optical power, has a convex object-side surface; The sixth lens with positive optical power has a concave object side and a convex image side. A seventh lens with optical power has a convex object-side surface and a concave image-side surface; and The eighth lens, which has negative optical power, has a concave image-side surface; The inner diameter of the inner wall of the lens tube increases sequentially from the object side end to the imaging end; The fifth lens and the seventh lens have optical powers with opposite signs; At least two of the second to seventh lenses have negative optical power; A spacer element P1 and a spacer element P2 are sequentially disposed between the first lens and the second lens; The spacer element P1 is in contact with the image-side end portion of the first lens; The spacer element P2 is in contact with the object-side end portion of the second lens; Wherein, the outer diameter D1s of the spacer P1 near the object side end, the inner diameter d2s of the spacer P2 near the object side end, the distance EP01 from the object side end face of the lens barrel to the spacer P1 on the optical axis, and the center thickness CT1 of the first lens on the optical axis satisfy: 17.53≤D1s / EP01+d2s / CT1≤21.95; A spacer element P3 is provided between the second lens and the third lens; Wherein, the radius of curvature R1 of the object side of the first lens, the inner diameter ds of the end of the lens barrel near the object side, the distance EP23 between the spacer element P2 and the spacer element P3, and the air gap T23 between the second lens and the third lens on the optical axis satisfy: 5.96≤|R1 / (ds / 2)|+EP23 / T23≤9.

27.

2. The optical imaging lens according to claim 1, characterized in that, A spacer element P4 is provided between the third lens and the fourth lens; Wherein, the radius of curvature R6 of the image side of the third lens, the air gap T34 between the third lens and the fourth lens on the optical axis, the center thickness CT4 of the fourth lens on the optical axis, and the outer diameter D4s of the spacer element P4 near the object side satisfy: 23.93≤R6 / T34+D4s / CT4≤33.

48.

3. The optical imaging lens according to claim 1 or 2, characterized in that, The axial distance TD from the object side of the first lens to the image side of the eighth lens and the thickness CPmax of all spacer elements satisfy: 4.92≤TD / CPmax≤10.

19.

4. The optical imaging lens according to claim 1 or 2, characterized in that, A spacer element P7 and a spacer element P8 are sequentially disposed between the fifth lens and the sixth lens; The spacer element P7 is in contact with the image-side end portion of the fifth lens; The spacer element P8 is in contact with the object-side end portion of the sixth lens; Wherein, the outer diameter D8s of the spacer element P8 near the object side, the inner diameter d8s of the spacer element P8 near the object side, the radius of curvature R11 of the object side of the sixth lens, and the radius of curvature R12 of the image side of the sixth lens satisfy: 2.23≤(|D8s / R12|-|d8s / R11|)×fno≤3.

86.

5. The optical imaging lens according to claim 1 or 2, characterized in that, A spacer element P10 is provided between the seventh lens and the eighth lens, and a spacer element P11 is provided at the image side end of the eighth lens; Wherein, the outer diameter D10m of the spacer element P10 near the image side end, the distance EP1011 between the spacer element P10 and the spacer element P11, the outer diameter D0m of the imaging end of the lens barrel, and the maximum effective radius SD82 of the image side surface of the eighth lens satisfy: 10.13≤D10m / EP1011+D0m / SD82≤12.

26.

6. The optical imaging lens according to claim 1 or 2, characterized in that, A spacer element P7 and a spacer element P8 are sequentially provided between the fifth lens and the sixth lens, and a spacer element P9 is provided between the sixth lens and the seventh lens; The spacer element P7 is in contact with the image-side end portion of the fifth lens; The spacer element P8 is in contact with the object-side end portion of the sixth lens; The following parameters are satisfied: the maximum thickness CP8 of the spacer element P8, the distance EP89 between the spacer element P8 and the spacer element P9, the center thickness CT6 of the sixth lens on the optical axis, the air gap T56 between the fifth and sixth lenses on the optical axis, the radius of curvature R12 of the image side of the sixth lens, and the outer diameter D7s of the spacer element P7 near the object side. 4.46≤(CP8+EP89) / (CT6-T56)+|D7s / R12|≤6.

02.

7. The optical imaging lens according to claim 1 or 2, characterized in that, A spacer element P4 is provided between the third lens and the fourth lens, and a spacer element P5 is provided at the image side end of the fifth lens; Wherein, the center thickness CT3 of the third lens on the optical axis, the center thickness CT4 of the fourth lens on the optical axis, the air gap T34 between the third lens and the fourth lens on the optical axis, the distance EP45 between the spacer element P4 and the spacer element P5, and the outer diameter D4s of the spacer element P4 near the object side satisfy: 8.16≤CT4 / EP45+D4s / (CT3+T34)≤18.

46.

8. An optical imaging lens, comprising a lens barrel and a lens group assembled within the lens barrel, characterized in that, The lens group comprises eight lenses with optical power, arranged sequentially from the object side to the imaging side: The first lens with positive optical power has a concave object side and a convex image side. A second lens with negative optical power has a convex object side and a concave image side. A third lens with optical power has a convex object side and a concave image side. The fourth lens with positive optical power has a convex object-side surface and a convex image-side surface. The fifth lens, which has optical power, has a convex object-side surface; The sixth lens with positive optical power has a concave object side and a convex image side. A seventh lens with optical power has a convex object-side surface and a concave image-side surface; and The eighth lens, which has negative optical power, has a concave image-side surface; The lens group abuts against the inner wall of the lens barrel, and the diameter of the inner wall of the lens barrel increases sequentially from the object-side end to the imaging end; wherein, At least two of the second to seventh lenses have negative optical power; The fifth lens and the seventh lens have opposite optical powers; Spacer element P1 and spacer element P2 are provided between the first lens and the second lens; A spacer element P3 is provided between the second lens and the third lens; A spacer element P4 is provided between the third lens and the fourth lens; Spacer element P5 and spacer element P6 are provided between the fourth lens and the fifth lens; Spacer element P7 and spacer element P8 are provided between the fifth lens and the sixth lens; A spacer element P9 is provided between the sixth lens and the seventh lens; A spacer element P10 is provided between the seventh lens and the eighth lens; The image-side end of the eighth lens is provided with a spacer element P11; The outer diameter D10m of the spacer element P10 near the image side end, the distance EP1011 between the spacer element P10 and the spacer element P11, the outer diameter D0m of the imaging end of the lens barrel, and the maximum effective radius SD82 of the image side surface of the eighth lens satisfy: 10.13≤D10m / EP1011+D0m / SD82≤12.26; Wherein, the radius of curvature R1 of the object side of the first lens, the inner diameter ds of the end of the lens barrel near the object side, the distance EP23 between the spacer element P2 and the spacer element P3, and the air gap T23 between the second lens and the third lens on the optical axis satisfy: 5.96≤|R1 / (ds / 2)|+EP23 / T23≤9.

27.

9. The optical imaging lens according to claim 8, characterized in that, in, The outer diameter D1s of the spacer P1 near the object side, the inner diameter d2s of the spacer P2 near the object side, the distance EP01 from the object side end of the lens barrel to the spacer P1 on the optical axis, and the center thickness CT1 of the first lens on the optical axis satisfy: 17.53≤D1s / EP01+d2s / CT1≤21.

95.

10. The optical imaging lens according to claim 9, characterized in that, The radius of curvature R6 of the image side of the third lens, the air gap T34 between the third lens and the fourth lens on the optical axis, the center thickness CT4 of the fourth lens on the optical axis, and the outer diameter D4s of the spacer element P4 near the object side satisfy: 23.93≤R6 / T34+D4s / CT4≤33.

48.

11. The optical imaging lens according to claim 9, characterized in that, The axial distance TD from the object side of the first lens to the image side of the eighth lens and the thickness CPmax of all spacer elements satisfy: 4.92≤TD / CPmax≤10.

19.

12. The optical imaging lens according to claim 10, characterized in that, The outer diameter D8s of the spacer element P8 near the object side, the inner diameter d8s of the spacer element P8 near the object side, the radius of curvature R11 of the object side of the sixth lens, and the radius of curvature R12 of the image side of the sixth lens satisfy the following: 2.23≤(|D8s / R12|-|d8s / R11|)×fno≤3.

86.

13. The optical imaging lens according to claim 10, characterized in that, The maximum thickness CP8 of the spacer element P8, the distance EP89 between the spacer element P8 and the spacer element P9, the center thickness CT6 of the sixth lens on the optical axis, the air gap T56 between the fifth and sixth lenses on the optical axis, the radius of curvature R12 of the image side of the sixth lens, and the outer diameter D7s of the spacer element P7 near the object side end satisfy the following: 4.46≤(CP8+EP89) / (CT6-T56)+|D7s / R12|≤6.

02.

14. The optical imaging lens according to any one of claims 8-13, characterized in that, The center thickness CT3 of the third lens on the optical axis, the center thickness CT4 of the fourth lens on the optical axis, the air gap T34 between the third and fourth lenses on the optical axis, the distance EP45 between the spacer element P4 and the spacer element P5, and the outer diameter D4s of the spacer element P4 near the object side satisfy: 8.16≤CT4 / EP45+D4s / (CT3+T34)≤18.46.

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