Optical photographic lens

Abstract

The application provides an optical photographic lens. The optical photographic lens comprises a lens barrel and 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 in the lens barrel, the image side surface of the seventh lens is free of inflection points, and the image side surface of the eighth lens has inflection points; the optical photographic lens further comprises a plurality of spacers; the maximum height L of the lens barrel and half of the diagonal length of the effective pixel area on the imaging surface of the optical photographic lens ImgH satisfy the following relationship: L / ImgH<1.1; the on-axis distance SAG81 between the intersection of the object side surface of the eighth lens and the optical axis and the effective radius vertex of the object side surface of the eighth lens and the interval EP67 between the sixth spacer and the seventh spacer satisfy the following relationship: -4.0<SAG81 / EP67<-2.5. The application solves the problem that the optical photographic lens in the prior art is prone to damage during assembly due to compact structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical imaging devices, in particular to an optical photographic lens. BACKGROUND

[0002] Nowadays, optical photographic lenses have higher resolution and better imaging quality. With the popularization of digital photography technology, the design and manufacture of optical photographic lenses become more and more sophisticated, which can meet the shooting requirements of different scenes and needs.

[0003] Nowadays, consumers have increasingly stringent requirements for the pixels of optical photographic lenses, which makes lens manufacturers need to continuously break through to design lenses that meet user requirements. However, in the actual design stage, due to the different requirements of users for the structure and shape of optical photographic lenses, the internal structures of different optical photographic lenses are quite different, which easily increases the process capability risk of optical photographic lenses. For example, most users require the internal structure of the optical photographic lens to be compact and the shape of the individual lens to meet the imaging requirements and assembly process.

[0004] That is, the optical photographic lens in the prior art has the problem that the compact structure causes the lens to be easily damaged during assembly. SUMMARY

[0005] The main purpose of the present application is to provide an optical photographic lens to solve the problem that the optical photographic lens in the prior art has a compact structure which causes the lens to be easily damaged during assembly.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present application, an optical photographic lens is provided, which comprises a lens and 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 in sequence along the optical axis of the lens barrel from the object side to the image side in the lens barrel, wherein the image side surface of the seventh lens has no inflection point, and the image side surface of the eighth lens has an inflection point; the optical photographic lens further comprises a plurality of spacers, the plurality of spacers at least comprising a sixth spacer located between the sixth lens and the seventh lens and in contact with the image side surface of the sixth lens, and a seventh spacer located between the seventh lens and the eighth lens and in contact with the image side surface of the seventh lens; the maximum height of the lens barrel, i.e. the axial distance L from the object side end surface of the lens barrel to the image side end surface of the lens barrel, and half of the diagonal line length ImgH of the effective pixel area on the imaging surface of the optical photographic lens satisfy: L / ImgH<1.1; the on-axis distance SAG81 between the intersection of the object side surface of the eighth lens and the optical axis and the effective radius vertex of the object side surface of the eighth lens, and the interval EP67 between the sixth spacer and the seventh spacer satisfy: -4.0<SAG81 / EP67<-2.5.

[0007] Further, the plurality of spacers further includes a first spacer located between the first lens and the second lens and in contact with the image side surface of the first lens, and the effective focal length f1 of the first lens, the outer diameter D1s of the object side surface of the first spacer, and the outer diameter D1m of the image side surface of the first spacer satisfy -15.0 < f1 / (D1s+D1m) < -3.5.

[0008] Further, the plurality of spacers further includes a first spacer located between the first lens and the second lens and in contact with the image side surface of the first lens, and the interval EP01 between the object side end surface of the lens barrel and the first spacer and the central thickness CT1 of the first lens on the optical axis satisfy 1.5 < EP01 / CT1 < 2.5.

[0009] Further, the plurality of spacers further includes a second spacer located between the second lens and the third lens and in contact with the image side surface of the second lens, and the air interval T23 of the second lens and the third lens on the optical axis and the maximum thickness CP2 of the second spacer satisfy 1.5 < T23 / CP2 < 2.0.

[0010] Further, the plurality of spacers further includes a first spacer located between the first lens and the second lens and in contact with the image side surface of the first lens, a second spacer located between the second lens and the third lens and in contact with the image side surface of the second lens, and the interval EP12 between the first spacer and the second spacer, the on-axis distance SAG11 between the intersection of the object side surface of the first lens and the optical axis and the effective radius vertex of the object side surface of the first lens, and the on-axis distance SAG21 between the intersection of the object side surface of the second lens and the optical axis and the effective radius vertex of the object side surface of the second lens satisfy 2.5 < EP12 / (SAG11-SAG21) < 12.5.

[0011] Further, the plurality of spacers further includes a third spacer located between the third lens and the fourth lens and in contact with the image side surface of the third lens, and a fourth spacer located between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens, and the effective focal length f3 of the third lens and the inner diameter d3s of the object side surface of the third spacer satisfy -6.0 < f3 / d3s < -3.5, and the effective focal length f4 of the fourth lens and the inner diameter d4s of the object side surface of the fourth spacer satisfy 1.0 < f4 / d4s < 1.7.

[0012] Further, the edge position of the image side surface of the sixth lens has a surface shape opposite to the convex-concave of the center position of the image side surface of the sixth lens.

[0013] Further, the combined focal length f78 of the seventh lens and the eighth lens, the outer diameter D7s of the object side surface of the seventh spacer, and the outer diameter D6m of the image side surface of the sixth spacer satisfy -26.0 < f78 / (D7s-D6m) < 68.

[0014] Further, the plurality of spacers further includes a fifth spacer located between the fifth lens and the sixth lens and in contact with the image side surface of the fifth lens, and an air interval T56 of the fifth lens and the sixth lens on the optical axis satisfies: 8.5 < T56 / CP5 < 18.5 between the maximum thickness CP5 of the fifth spacer.

[0015] Further, the plurality of spacers further includes a fifth spacer located between the fifth lens and the sixth lens and in contact with the image side surface of the fifth lens, and an effective focal length f5 of the fifth lens, a refractive index N5 of the fifth lens, an outer diameter D6s of the object side surface of the sixth spacer, and an outer diameter D5m of the image side surface of the fifth spacer satisfy: -12.5 < f5*N5 / (D6s-D5m) < 20.0.

[0016] Further, the plurality of spacers further includes a fifth spacer located between the fifth lens and the sixth lens and in contact with the image side surface of the fifth lens, and an interval EP56 between the fifth spacer and the sixth spacer, and an on-axis distance SAG62 between the intersection of the image side surface of the sixth lens and the optical axis and the effective radius vertex of the image side surface of the sixth lens satisfy: -30 < EP56 / SAG62 < -1.5.

[0017] Further, an effective focal length f4 of the fourth lens and an effective focal length f5 of the fifth lens satisfy: -1.0 < f4 / f5 < -0.5.

[0018] Further, the plurality of spacers further includes a fourth spacer located between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens, a fifth spacer located between the fifth lens and the sixth lens and in contact with the image side surface of the fifth lens, and an outer diameter D4m of the image side surface of the fourth spacer, an inner diameter d4m of the image side surface of the fourth spacer, an outer diameter D5s of the object side surface of the fifth spacer, and an inner diameter d5s of the object side surface of the fifth spacer satisfy: (D4m-d4m) < (D5s-d5s).

[0019] According to another aspect of the present application, there is provided an optical photographing lens, comprising a lens barrel and 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 in the lens barrel in order from an object side to an image side along an optical axis of the lens barrel, wherein the image side surface of the seventh lens is free of inflection point, and the image side surface of the eighth lens has an inflection point; the optical photographing lens further comprises a plurality of spacers, at least comprising a sixth spacer located between the sixth lens and the seventh lens and in contact with the image side surface of the sixth lens, and a seventh spacer located between the seventh lens and the eighth lens and in contact with the image side surface of the seventh lens; the maximum height of the lens barrel, i.e. the axial distance L between the object side end surface of the lens barrel and the image side end surface of the lens barrel, and half of the diagonal length of the effective pixel area on the imaging surface of the optical photographing lens ImgH satisfy: L / ImgH<1.1; the combined focal length f78 of the seventh lens and the eighth lens, the outer diameter D7s of the object side surface of the seventh spacer and the outer diameter D6m of the image side surface of the sixth spacer satisfy: -26.0<f78 / (D7s-D6m)<68.

[0020] According to another aspect of the present application, there is provided an optical photographing lens, comprising a lens barrel and 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 in the lens barrel in order from an object side to an image side along an optical axis of the lens barrel, wherein the image side surface of the seventh lens is free of inflection point, and the image side surface of the eighth lens has an inflection point; the optical photographing lens further comprises a plurality of spacers, at least comprising a sixth spacer located between the sixth lens and the seventh lens and in contact with the image side surface of the sixth lens, and a seventh spacer located between the seventh lens and the eighth lens and in contact with the image side surface of the seventh lens; the maximum height of the lens barrel, i.e. the axial distance L between the object side end surface of the lens barrel and the image side end surface of the lens barrel, and half of the diagonal length of the effective pixel area on the imaging surface of the optical photographing lens ImgH satisfy: L / ImgH<1.1; the effective focal length f1 of the first lens, the outer diameter D1s of the object side surface of the first spacer and the outer diameter D1m of the image side surface of the first spacer satisfy: -15.0<f1 / (D1s+D1m)<-3.5.

[0021] According to another aspect of the present application, there is provided an optical photographic lens, comprising a lens barrel and 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 in the lens barrel in sequence from an object side to an image side along an optical axis of the lens barrel, wherein the image side surface of the seventh lens is free of inflection point, and the image side surface of the eighth lens has an inflection point; the optical photographic lens further comprises a plurality of spacers, at least comprising a sixth spacer located between the sixth lens and the seventh lens and in contact with the image side surface of the sixth lens, and a seventh spacer located between the seventh lens and the eighth lens and in contact with the image side surface of the seventh lens; the maximum height of the lens barrel, i.e. the axial distance L between the object side end surface of the lens barrel and the image side end surface of the lens barrel, and half of the diagonal length of the effective pixel area on the imaging surface of the optical photographic lens ImgH satisfy: L / ImgH<1.1; the effective focal length f5 of the fifth lens, the refractive index N5 of the fifth lens, the outer diameter D6s of the object side surface of the sixth spacer and the outer diameter D5m of the image side surface of the fifth spacer satisfy: -12.5<f5*N5 / (D6s-D5m)<20.0.

[0022] According to the technical solution of the present application, the optical photographic lens comprises a lens barrel and 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 in the lens barrel in sequence from an object side to an image side along an optical axis of the lens barrel, wherein the image side surface of the seventh lens is free of inflection point, and the image side surface of the eighth lens has an inflection point; the optical photographic lens further comprises a plurality of spacers, at least comprising a sixth spacer located between the sixth lens and the seventh lens and in contact with the image side surface of the sixth lens, and a seventh spacer located between the seventh lens and the eighth lens and in contact with the image side surface of the seventh lens; the maximum height of the lens barrel, i.e. the axial distance L between the object side end surface of the lens barrel and the image side end surface of the lens barrel, and half of the diagonal length of the effective pixel area on the imaging surface of the optical photographic lens ImgH satisfy: L / ImgH<1.1; the axial distance SAG81 between the intersection of the object side surface of the eighth lens and the optical axis and the effective radius vertex of the object side surface of the eighth lens and the interval EP67 between the sixth spacer and the seventh spacer satisfy: -4.0<SAG81 / EP67<-2.5.

[0023] By constraining L / ImgH<1.1 and -4.0<SAG81 / EP67<-2.5, and setting the image side surface of the seventh lens free of inflection point and the image side surface of the eighth lens having an inflection point, the compactness of the structure in the lens barrel is ensured, the edge light can be controlled to make the optical photographic lens have better imaging quality, and the assembly stability of each lens can be controlled and the bump problem caused by the close distance between the eighth lens and the seventh lens can be avoided, so that the lens performance stability is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings, which form a part of this specification, are included to provide a further understanding of the application, and are incorporated herein by reference. The embodiments of the present application, and their

[0025] Figure 1 A size annotation diagram of an optical photographing lens of an optional embodiment of the present application is shown;

[0026] Figure 2 A structure diagram of an optical photographing lens of an embodiment of the present application in a first state is shown;

[0027] Figure 3 A structure diagram of an optical photographing lens of an embodiment of the present application in a second state is shown;

[0028] Figure 4 A structure diagram of an optical photographing lens of an embodiment of the present application in a third state is shown;

[0029] Figures 5 to 8 An on-axis chromatic aberration curve, an astigmatism curve, a distortion curve and a lateral chromatic aberration curve of an embodiment of the present application are shown respectively;

[0030] Figure 9 A structure diagram of an optical photographing lens of an embodiment of the present application in a first state is shown;

[0031] Figure 10 A structure diagram of an optical photographing lens of an embodiment of the present application in a second state is shown;

[0032] Figure 11 A structure diagram of an optical photographing lens of an embodiment of the present application in a third state is shown;

[0033] Figures 12 to 15 An on-axis chromatic aberration curve, an astigmatism curve, a distortion curve and a lateral chromatic aberration curve of an embodiment of the present application are shown respectively;

[0034] Figure 16 A structure diagram of an optical photographing lens of an embodiment of the present application in a first state is shown;

[0035] Figure 17 A structure diagram of an optical photographing lens of an embodiment of the present application in a second state is shown;

[0036] Figure 18 A structure diagram of an optical photographing lens of an embodiment of the present application in a third state is shown;

[0037] Figures 19 to 22The axial chromatic aberration curve, the astigmatism curve, the distortion curve and the lateral chromatic aberration curve of the fourth embodiment of the present application are shown respectively.

[0038] Figure 23 The structural schematic diagram of the optical photographic lens of the fourth embodiment of the present application in the first state is shown.

[0039] Figure 24 The structural schematic diagram of the optical photographic lens of the fourth embodiment of the present application in the second state is shown.

[0040] Figure 25 The structural schematic diagram of the optical photographic lens of the fourth embodiment of the present application in the third state is shown.

[0041] Figures 26 to 29 The axial chromatic aberration curve, the astigmatism curve, the distortion curve and the lateral chromatic aberration curve of the fourth embodiment of the present application are shown respectively.

[0042] In the above drawings, the following reference signs are used:

[0043] P0, barrel; E1, first lens; S1, object side surface of the first lens; S2, image side surface of the first lens; E2, second lens; S3, object side surface of the second lens; S4, image side surface of the second lens; E3, third lens; S5, object side surface of the third lens; S6, image side surface of the third lens; E4, fourth lens; S7, object side surface of the fourth lens; S8, image side surface of the fourth lens; E5, fifth lens; S9, object side surface of the fifth lens; S10, image side surface of the fifth lens; E6, sixth lens; S11, object side surface of the sixth lens; S12, image side surface of the sixth lens; E7, seventh lens; S13, object side surface of the seventh lens; S14, image side surface of the seventh lens; E8, eighth lens; S15, object side surface of the eighth lens; S16, image side surface of the eighth lens; P1, first spacer; P2, second spacer; P3, third spacer; P4, fourth spacer; P5, fifth spacer; P6, sixth spacer; P7, seventh spacer. DETAILED DESCRIPTION

[0044] It should be noted that the embodiments and the features in the embodiments in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0045] It should be noted that, unless otherwise specified, all the technical and scientific terms used in the present application have the same meaning as that generally understood by the ordinary skilled in the art to which the present application belongs.

[0046] In the present application, the orientation words such as "upper", "lower", "top", "bottom" are generally directed to the directions shown in the drawings, or are directed to the vertical, perpendicular or gravity directions of the components themselves, unless otherwise specified. Similarly, for the convenience of understanding and description, "inner" and "outer" refer to the inner and outer relative to the contour of the components themselves, but the above orientation words are not used to limit the present application.

[0047] It should be noted that the terms first, second, third, etc. in the present description 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.

[0048] In the drawings, the thickness, size and shape of the lens have been slightly exaggerated for the convenience of illustration. Specifically, the shape of the spherical surface or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical surface or aspherical surface is not limited to the shape of the spherical surface or aspherical surface shown in the drawings. The drawings are merely examples and are not strictly drawn to scale.

[0049] In this context, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The judgment of the surface shape in the paraxial region can be based on the judgment method of those skilled in the art, with R value (R refers to the radius of curvature in the paraxial region, usually refers to the R value on the lens data in the optical software) to judge the convexity and concavity. In terms of the light entering side, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; in terms of the light exiting side, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex.

[0050] In order to solve the problem that the optical photographic lens in the prior art is prone to damage during assembly due to compact structure, the present application provides an optical photographic lens.

[0051] As Figures 1 to 29In an optional embodiment of the present application, the optical photographing lens includes a lens barrel and 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 in the lens barrel along the optical axis of the lens barrel in sequence from the object side to the image side, wherein the image side surface of the seventh lens has no inflection point, and the image side surface of the eighth lens has an inflection point; the optical photographing lens further includes a plurality of spacers, the plurality of spacers at least include a sixth spacer located between the sixth lens and the seventh lens and in contact with the image side surface of the sixth lens, and a seventh spacer located between the seventh lens and the eighth lens and in contact with the image side surface of the seventh lens; the maximum height of the lens barrel, i.e. the axial distance L between the object side end surface of the lens barrel and the image side end surface of the lens barrel, and half of the diagonal line length of the effective pixel area on the imaging surface of the optical photographing lens ImgH satisfy: L / ImgH<1.1; the on-axis distance SAG81 between the intersection of the object side surface of the eighth lens and the optical axis and the effective radius vertex of the object side surface of the eighth lens, and the interval EP67 between the sixth spacer and the seventh spacer satisfy: -4.0<SAG81 / EP67<-2.5.

[0052] By constraining L / ImgH<1.1 and -4.0<SAG81 / EP67<-2.5, and setting the image side surface of the seventh lens to have no inflection point and the image side surface of the eighth lens to have an inflection point, the compactness of the structure in the lens barrel is ensured, the edge rays are controlled to make the optical photographing lens have better imaging quality, and the assembly stability of each lens is controlled and the bump problem caused by the close distance between the eighth lens and the seventh lens is avoided, thereby ensuring the stability of the lens performance.

[0053] In addition, the sensitivity between the seventh lens and the eighth lens when the optical photographing lens satisfies SAG81 / EP67=-4.5 and SAG81 / EP67=-3.03 is shown in Table 1-1 below.

[0054]

[0055] Table 1-1

[0056] From Table 1-1, it can be seen that when the optical photographing lens satisfies L / ImgH < 1.1 and the image side surface of the seventh lens has no inflection point and the image side surface of the eighth lens has an inflection point, the sensitivity sp7 between the seventh lens and the eighth lens is -4.80 when SAG81 / EP67 = -4.5, the sensitivity sp7 between the seventh lens and the eighth lens is 2.30 when SAG81 / EP67 = -3.03, and the sensitivity sp7 between the seventh lens and the eighth lens is 4.80 when SAG81 / EP67 = -1.9. It can be seen that when SAG81 / EP67 is in the range of -4.0 to -2.5, the sensitivity between the seventh lens and the eighth lens is small, and when SAG81 / EP67 is less than or equal to -4.0 or greater than -2.5, the sensitivity between the seventh lens and the eighth lens is large. Therefore, by limiting SAG81 / EP67 to be in the range of -4.0 to -2.5, the present application is beneficial to reduce the sensitivity between the seventh lens and the eighth lens, thereby avoiding the problem of collision between the eighth lens and the seventh lens due to the close distance between the eighth lens and the seventh lens, and ensuring the stability of the lens performance.

[0057] It should be noted that the plurality of spacers further include a first spacer located between the first lens and the second lens and in contact with the image side surface of the first lens, a second spacer located between the second lens and the third lens and in contact with the image side surface of the second lens, a third spacer located between the third lens and the fourth lens and in contact with the image side surface of the third lens, a fourth spacer located between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens, and a fifth spacer located between the fifth lens and the sixth lens and in contact with the image side surface of the fifth lens.

[0058] In the present embodiment, the effective focal length f1 of the first lens, the outer diameter D1s of the object side surface of the first spacer, and the outer diameter D1m of the image side surface of the first spacer satisfy -15.0 < f1 / (D1s+D1m) < -3.5. By controlling this condition, it is ensured that the first spacer can have a full thickness of the light passing hole, avoiding the problem of light shining out of the hole during injection molding due to insufficient thickness of the first spacer, reducing the possibility of misalignment of the bearing position of the first lens and the lens barrel, helping to control the size of the light exit hole of the lens barrel, intercepting stray light paths, and also helping to reduce stray light caused by reflection inside the lens barrel.

[0059] In the present embodiment, the interval EP01 between the object side end surface of the lens barrel and the first spacer and the central thickness CT1 of the first lens on the optical axis satisfy 1.5 < EP01 / CT1 < 2.5. By controlling this condition, the risk of scratching caused by the convexity of the first lens being higher than the object side end surface of the lens barrel can be effectively reduced, and the uniformity of the thickness of the first lens can be ensured, thereby ensuring the stability of the molding of the first lens and improving the final imaging quality.

[0060] In the embodiment, the air interval T23 of the second lens and the third lens on the optical axis and the maximum thickness CP2 of the second spacer satisfy: 1.5 < T23 / CP2 < 2.0. By controlling the conditional expression, the risk of collision between the second lens and the third lens due to too small interval can be avoided, and the variation of the air interval of the second lens and the third lens on the optical axis can be reduced while considering the reliability of the optical photographic lens, thereby facilitating the improvement of the yield of finished products of the optical photographic lens.

[0061] In the embodiment, the interval EP12 between the first spacer and the second spacer, the on-axis distance SAG11 between the intersection of the object side surface of the first lens and the optical axis and the effective radius vertex of the object side surface of the first lens, and the on-axis distance SAG21 between the intersection of the object side surface of the second lens and the optical axis and the effective radius vertex of the object side surface of the second lens satisfy: 2.5 < EP12 / (SAG11-SAG21) < 12.5. By satisfying the conditional expression, the effective diameter of the second lens is ensured to be smaller than the effective diameter of the first lens, the stray light reflected by the lens before the second lens can be effectively avoided by the first spacer and the second spacer, and the structural strength of the edge mechanism part of the second lens can be ensured, thereby ensuring the assembly stability.

[0062] In the embodiment, the effective focal length f3 of the third lens and the inner diameter d3s of the object side surface of the third spacer satisfy: -6.0 < f3 / d3s < -3.5; such setting not only can limit the bending degree of the third lens, but also can ensure that the inner diameter of the third spacer effectively intercepts the stray light reflected by the effective diameter edge of the third lens, which is conducive to the improvement of the stray light. The effective focal length f4 of the fourth lens and the inner diameter d4s of the object side surface of the fourth spacer satisfy: 1.0 < f4 / d4s < 1.7; such setting not only can avoid the stray light reflected by the effective diameter edge of the fourth lens, but also can avoid the risk of collision between the third lens and the fourth lens due to too small interval.

[0063] In the embodiment, the edge position of the image side surface of the sixth lens has a surface type opposite to the convex-concave of the center position of the image side surface of the sixth lens. The concave surface of the effective diameter edge of the image side surface of the sixth lens can reflect the light to the most edge mechanism part of the sixth lens, and the stray light can be effectively avoided through the structural optimization of the mechanism part.

[0064] In the embodiment, the combined focal length f78 of the seventh lens and the eighth lens, the outer diameter D7s of the object side surface of the seventh spacer, and the outer diameter D6m of the image side surface of the sixth spacer satisfy: -26.0 < f78 / (D7s-D6m) < 68. Satisfying the condition formula can reduce the misalignment of the abutting positions of the sixth lens and the seventh lens; helps to control the size of the sixth spacer and the seventh spacer, intercept stray light paths, and at the same time helps to reduce stray light caused by reflection of the spacers.

[0065] In the embodiment, the air interval T56 of the fifth lens and the sixth lens on the optical axis and the maximum thickness CP5 of the fifth spacer satisfy: 8.5 < T56 / CP5 < 18.5. Satisfying the condition formula can avoid the risk of collision of the fifth lens and the sixth lens due to too small interval, and also reduce the change amount of the air interval of the fifth lens and the sixth lens on the optical axis while considering the reliability of the optical photographic lens, thereby facilitating the improvement of the yield of finished products of the optical photographic lens.

[0066] In the embodiment, the effective focal length f5 of the fifth lens, the refractive index N5 of the fifth lens, the outer diameter D6s of the object side surface of the sixth spacer, and the outer diameter D5m of the image side surface of the fifth spacer satisfy: -12.5 < f5*N5 / (D6s-D5m) < 20.0. Satisfying the condition formula can not only ensure the step difference between the fifth lens and the seventh lens to enhance the assembly stability, but also reduce the intensity of stray light directly reflected by the spacer.

[0067] In the embodiment, the interval EP56 between the fifth spacer and the sixth spacer, and the on-axis distance SAG62 between the intersection of the image side surface of the sixth lens and the optical axis and the effective radius vertex of the image side surface of the sixth lens satisfy: -30 < EP56 / SAG62 < -1.5. Restricting the condition formula can weaken the ghost image intensity generated by reflection of the two side surfaces of the sixth lens when passing through the sixth lens.

[0068] In the embodiment, the effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens satisfy: -1.0 < f4 / f5 < -0.5. Satisfying the condition formula can effectively limit the on-axis distance of the fourth lens and the fifth lens, thereby avoiding the problem of field sensitivity caused by too large interval and avoiding the decline of the final imaging quality.

[0069] In this embodiment, the outer diameter D4m of the image side of the fourth spacer, the inner diameter d4m of the image side of the fourth spacer, the outer diameter D5s of the object side of the fifth spacer, and the inner diameter d5s of the object side of the fifth spacer satisfy the condition: (D4m-d4m) < (D5s-d5s). Constraining this condition ensures that the step difference between the fourth and fifth lenses tends upwards, guaranteeing consistent contact force positions between the lenses, and thus improving the assembly stability of the optical imaging lens to increase yield.

[0070] like Figures 1 to 19 As shown, in another optional embodiment of this application, the optical imaging lens includes a lens barrel and 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 sequentially disposed in the lens barrel from the object side to the image side along the optical axis of the lens barrel. The seventh lens has no inflection point on its image-side surface, while the eighth lens has an inflection point on its image-side surface. The optical imaging lens also includes multiple spacers, at least including a sixth spacer located between the sixth and seventh lenses and in contact with the image-side surface of the sixth lens, and a spacer located between the object side and the image side of the seventh lens. The seventh spacer is between the seventh and eighth lenses and in contact with the image-side surface of the seventh lens; the maximum height of the lens barrel, i.e., the axial distance L from the object-side end face of the lens barrel to the image-side end face of the lens barrel, satisfies the following condition: L / ImgH < 1.1; the combined focal length f78 of the seventh and eighth lenses, the outer diameter D7s of the object-side surface of the seventh spacer, and the outer diameter D6m of the image-side surface of the sixth spacer satisfy the following condition: -26.0 < f78 / (D7s-D6m) < 68.

[0071] By constraining L / ImgH < 1.1 and -26.0 < f78 / (D7s-D6m) < 68, and setting the image-side surface of the seventh lens to have no inflection point and the edge position of the image-side surface of the eighth lens to have a convex surface, it is beneficial to ensure the compactness of the internal structure of the lens barrel. At the same time, it can reduce the misalignment of the support positions of the sixth and seventh lenses. It also helps to control the size of the sixth and seventh spacers, intercept stray light paths, and reduce stray light caused by reflection from the spacers.

[0072] like Figures 1 to 19As shown, in another optional embodiment of the present application, the optical photographing lens comprises a lens barrel and 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 in the lens barrel in sequence from the object side to the image side along the optical axis of the lens barrel, wherein the image side surface of the seventh lens has no inflection point, and the image side surface of the eighth lens has an inflection point; the optical photographing lens further comprises a plurality of spacers, which at least comprise a sixth spacer located between the sixth lens and the seventh lens and in contact with the image side surface of the sixth lens, and a seventh spacer located between the seventh lens and the eighth lens and in contact with the image side surface of the seventh lens; the maximum height of the lens barrel, i.e. the axial distance L between the object side end surface of the lens barrel and the image side end surface of the lens barrel, and half of the diagonal line length ImgH of the effective pixel area on the imaging surface of the optical photographing lens satisfy: L / ImgH<1.1; the effective focal length f1 of the first lens, the outer diameter D1s of the object side surface of the first spacer and the outer diameter D1m of the image side surface of the first spacer satisfy: -15.0<f1 / (D1s+D1m)<-3.5.

[0073] By constraining L / ImgH<1.1 and -15.0<f1 / (D1s+D1m)<-3.5, and setting the image side surface of the seventh lens to have no inflection point and the image side surface of the eighth lens to have an inflection point, the compactness of the structure inside the lens barrel is ensured, and at the same time, it is ensured that the first spacer can have a full thickness of the light passing hole, so as to avoid the light shining out of the hole during injection molding due to insufficient thickness of the first spacer, thereby causing feather and other stray light; at the same time, the possibility of misalignment of the abutting position of the first lens and the lens barrel is reduced; it is helpful to control the size of the light emitting hole of the lens barrel, intercept stray light paths, and at the same time, it is helpful to reduce the stray light caused by the reflection inside the lens barrel.

[0074] As Figures 1 to 19In another optional embodiment of the present application, the optical photographing lens comprises a lens barrel and 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 in the lens barrel along the optical axis of the lens barrel in sequence from the object side to the image side, wherein the image side surface of the seventh lens has no inflection point, and the image side surface of the eighth lens has an inflection point; the optical photographing lens further comprises a plurality of spacers, the plurality of spacers at least comprises a sixth spacer located between the sixth lens and the seventh lens and in contact with the image side surface of the sixth lens, and a seventh spacer located between the seventh lens and the eighth lens and in contact with the image side surface of the seventh lens; the maximum height of the lens barrel, i.e. the axial distance L between the object side end surface of the lens barrel and the image side end surface of the lens barrel, and half of the diagonal length of the effective pixel area on the imaging surface of the optical photographing lens ImgH satisfy: L / ImgH < 1.1; the effective focal length f5 of the fifth lens, the refractive index N5 of the fifth lens, the outer diameter D6s of the object side surface of the sixth spacer and the outer diameter D5m of the image side surface of the fifth spacer satisfy: -12.5 < f5*N5 / (D6s-D5m) < 20.0.

[0075] By constraining L / ImgH < 1.1 and -12.5 < f5*N5 / (D6s-D5m) < 20.0, and setting the image side surface of the seventh lens to have no inflection point and the image side surface of the eighth lens to have an inflection point, the compactness of the structure in the lens barrel is ensured, the step difference between the fifth lens and the seventh lens is ensured to enhance the assembly stability, and the intensity of stray light directly reflected by the spacers is reduced.

[0076] Of course, other parameter formulas in the above embodiments can also be included in the present embodiment, which will not be described herein.

[0077] Optionally, the above optical photographing lens can further comprise a protective glass for protecting the photosensitive element located on the imaging surface.

[0078] The optical photographing lens in the present application can adopt multiple lenses, for example, eight lenses as described above. In the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The aspherical lens has the characteristic that the curvature continuously changes from the center of the lens to the periphery of the lens. Unlike the spherical lens which has a constant curvature from the center of the lens to the periphery of the lens, the aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting the aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality.

[0079] However, those skilled in the art should understand that the number of lenses constituting the optical photographic 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 photographic lens is not limited to including eight lenses. If necessary, the optical photographic lens can also include other numbers of lenses.

[0080] Figure 1 The structural schematic diagram of one optical photographic lens of the present application is shown, wherein Figure 1 The parameters D1s, D1m, d5s, d4s, d3s, D4m, D5m, D6m, D7s, L, EP67, EP56, EP12, EP01, CP2, CP5, etc. are marked in the figure, to clearly and intuitively understand the meaning of the parameters. In order to facilitate the optical photographic lens and the specific surface shape, the parameters are no longer embodied in the figure when the specific embodiments are described below.

[0081] The specific surface shape and parameters of the optical photographic lens applicable to the above-described embodiments are further described below with reference to the accompanying drawings.

[0082] It should be noted that in the following embodiments, there are first, second and third states, and the curvature radius, center thickness, etc. of the first lens to the eighth lens of the optical photographic lens in the first state, the second state and the third state in the same embodiment are the same, but the inner diameter and outer diameter of the lens barrel, the spacer and the shape of part of the lenses are different. Or, the main structure for imaging is the same, and the auxiliary structure for imaging is different.

[0083] It should be noted that any one of the following embodiments 1 to 4 is applicable to all embodiments of the present application.

[0084] Embodiment 1

[0085] As shown in Figures 2 to 8 , the optical photographic lens of embodiment 1 is described. Figure 2 The structural schematic diagram of the optical photographic lens of embodiment 1 in the first state is shown, Figure 3 The structural schematic diagram of the optical photographic lens of embodiment 1 in the second state is shown, Figure 4 The structural schematic diagram of the optical photographic lens of embodiment 1 in the third state is shown.

[0086] As shown in Figures 2 to 4As shown, the optical camera lens includes a lens barrel P0 and the following components arranged sequentially along the optical axis of the lens barrel P0 from the object side to the image side: a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fifth lens E5, a fifth spacer P5, a sixth lens E6, a sixth spacer P6, a seventh lens E7, a seventh spacer P7, and an eighth lens E8.

[0087] like Figure 2 As shown, in the first state, the object-side surface S1 of the first lens abuts against the lens barrel P0. The object-side surface and image-side surface of the first spacer P1 abut against the image-side surface S2 of the first lens and the object-side surface S3 of the second lens, respectively. The object-side surface and image-side surface of the second spacer P2 abut against the image-side surface S4 of the second lens and the object-side surface S5 of the third lens, respectively. The object-side surface and image-side surface of the third spacer P3 abut against the image-side surface S6 of the third lens and the object-side surface S7 of the fourth lens, respectively. The object-side surface and image-side surface of the fourth spacer P4 abut against the image-side surface S8 of the fourth lens and the object-side surface S9 of the fifth lens, respectively. The object-side surface and image-side surface of the fifth spacer P5 abut against the image-side surface S10 of the fifth lens and the object-side surface S11 of the sixth lens, respectively. The object-side surface and image-side surface of the sixth spacer P6 abut against the image-side surface S12 of the sixth lens and the object-side surface S13 of the seventh lens, respectively. The object-side and image-side surfaces of the seventh spacer P7 partially abut against the image-side surface S14 of the seventh lens and the object-side surface S15 of the eighth lens, respectively. The outer periphery of each spacer abuts against the inner wall surface of the lens barrel P0.

[0088] like Figure 3 As shown, in the second state, the way the spacers of the optical camera lens abut and contact is the same as in the first state. Please refer to the relevant description in the first state. It will not be repeated here.

[0089] like Figure 4 As shown, in the third state, the way the spacers of the optical camera lens abut and contact is the same as in the first state. Please refer to the relevant description in the first state. It will not be repeated here.

[0090] In summary, the structural parameters of the optical camera lens of Embodiment 1 in the first state 1-1, the second state 1-2, and the third state 1-3 are shown in Table 1. (Unit: mm)

[0091] Parameter 1-1 1-2 1-3 D1s (mm) 3.80 3.80 3.80 D1m (mm) 3.80 3.80 3.80 d3s (mm) 2.64 2.65 2.67 d4s (mm) 3.81 3.12 3.12 d4m (mm) 3.81 3.09 3.09 D4m (mm) 4.10 4.10 4.10 d5s (mm) 3.35 3.35 3.35 D5s (mm) 5.00 5.00 5.00 D5m (mm) 5.00 5.00 5.00 D6s (mm) 6.80 6.80 4.57 D6m (mm) 6.80 6.80 5.85 D7s (mm) 8.40 7.46 6.96 EP01 (mm) 0.64 0.64 0.64 EP12 (mm) 0.35 0.35 0.35 EP56 (mm) 0.74 0.74 0.47 EP67 (mm) 0.58 0.38 0.40 CP2 (mm) 0.02 0.02 0.02 CP5 (mm) 0.02 0.02 0.02 L (mm) 5.50 5.50 5.50

[0092] Table 1

[0093] In the embodiment one, the object side S1 of the first lens is convex, the image side S2 of the first lens is concave. The object side S3 of the second lens is convex, the image side S4 of the second lens is concave. The object side S5 of the third lens is convex, the image side S6 of the third lens is concave. The object side S7 of the fourth lens is concave, the image side S8 of the fourth lens is convex. The object side S9 of the fifth lens is concave, the image side S10 of the fifth lens is concave. The object side S11 of the sixth lens is convex, the image side S12 of the sixth lens is concave. The object side S13 of the seventh lens is convex, the image side S14 of the seventh lens is convex. The object side S15 of the eighth lens is concave, the image side S16 of the eighth lens is concave.

[0094] In the embodiment one, the total effective focal length f of the optical photographic lens is 5.49mm, the effective focal length f1 of the first lens is -28.87mm, the effective focal length f2 of the second lens is 4.56mm, the effective focal length f3 of the third lens is -15.36mm, the effective focal length f4 of the fourth lens is 4.91mm, the effective focal length f5 of the fifth lens is -5.48mm, the effective focal length f6 of the sixth lens is -15.66mm, the effective focal length f7 of the seventh lens is 4.05mm, the effective focal length f8 of the eighth lens is -3.76mm, the half of the diagonal length of the effective pixel area on the imaging surface of the optical photographic lens ImgH is 5.36mm, the on-axis distance SAG11 between the intersection of the object side of the first lens and the optical axis and the effective semi-diameter vertex of the object side of the first lens is 0.48mm, the on-axis distance SAG21 between the intersection of the object side of the second lens and the optical axis and the effective semi-diameter vertex of the object side of the second lens is 0.38mm, the on-axis distance SAG81 between the intersection of the object side of the eighth lens and the optical axis and the effective semi-diameter vertex of the object side of the eighth lens is -1.63mm.

[0095] Table 2 shows the basic structure parameter table of the optical photographic lens of the embodiment one, wherein the units of the curvature radius and the thickness / distance are millimeter mm.

[0096]

[0097] Table 2

[0098] In the embodiment one, the object side and the image side of the first lens E1 to the eighth lens E8 are all aspheric surfaces, and the surface type of each aspheric lens can be defined by the following aspheric formula, but is not limited thereto:

[0099]

[0100] wherein x is the distance from the vertex of the aspherical surface to the vertex height at a position of the aspherical surface along the optical axis at a height of h; 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 above; k is the conic constant; and Ai is the correction coefficient of the i-th order of the aspherical surface. Table 3 below provides the high-order term coefficients A4, A6, A8, A10, A12, A14, and A16 that can be used for each aspherical surface S1-S16 in Example 1.

[0101]

[0102]

[0103] Table 3

[0104] Figure 5 An axial chromatic aberration curve of the optical photography lens of Example 1 is shown, which represents the convergence point deviation of light rays of different wavelengths after passing through the optical photography lens. Figure 6 An astigmatism curve of the optical photography lens of Example 1 is shown, which represents the meridional image surface curvature and sagittal image surface curvature. Figure 7 A distortion curve of the optical photography lens of Example 1 is shown, which represents the distortion size values corresponding to different field angles. Figure 8 A lateral chromatic aberration curve of the optical photography lens of Example 1 is shown, which represents the deviation of light rays on the imaging surface after passing through the optical photography lens at different image heights.

[0105] According to Figures 5 to 8 It can be known that the optical photography lens provided in Example 1 can achieve good imaging quality.

[0106] Example 2

[0107] As Figures 9 to 15 shown, the optical photography lens of Example 2 is described. Figure 9 A structural schematic diagram of the optical photography lens of Example 2 in a first state is shown, Figure 10 A structural schematic diagram of the optical photography lens of Example 2 in a second state is shown, Figure 11 A structural schematic diagram of the optical photography lens of Example 2 in a third state is shown.

[0108] As Figures 9 to 11 shown, the optical photography lens includes a lens barrel P0 and, sequentially arranged in the lens barrel P0 from an object side to an image side along an optical axis of the lens barrel P0, a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fifth lens E5, a fifth spacer P5, a sixth lens E6, a sixth spacer P6, a seventh lens E7, a seventh spacer P7, and an eighth lens E8.

[0109] like Figure 9 As shown, in the first state, the object-side surface S1 of the first lens abuts against the lens barrel P0. The object-side surface and image-side surface of the first spacer P1 abut against the image-side surface S2 of the first lens and the object-side surface S3 of the second lens, respectively. The object-side surface and image-side surface of the second spacer P2 abut against the image-side surface S4 of the second lens and the object-side surface S5 of the third lens, respectively. The object-side surface and image-side surface of the third spacer P3 abut against the image-side surface S6 of the third lens and the object-side surface S7 of the fourth lens, respectively. The object-side surface and image-side surface of the fourth spacer P4 abut against the image-side surface S8 of the fourth lens and the object-side surface S9 of the fifth lens, respectively. The object-side surface and image-side surface of the fifth spacer P5 abut against the image-side surface S10 of the fifth lens and the object-side surface S11 of the sixth lens, respectively. The object-side surface and image-side surface of the sixth spacer P6 abut against the image-side surface S12 of the sixth lens and the object-side surface S13 of the seventh lens, respectively. The object-side and image-side surfaces of the seventh spacer P7 partially abut against the image-side surface S14 of the seventh lens and the object-side surface S15 of the eighth lens, respectively. The outer periphery of each spacer abuts against the inner wall surface of the lens barrel P0.

[0110] like Figure 10 As shown, in the second state, the way the spacers of the optical camera lens abut and contact is the same as in the first state. Please refer to the relevant description in the first state. It will not be repeated here.

[0111] like Figure 11 As shown, in the third state, the way the spacers of the optical camera lens abut and contact is the same as in the first state. Please refer to the relevant description in the first state. It will not be repeated here.

[0112] In summary, the structural parameters of the optical camera lens in Embodiment 2 under the first state 2-1, the second state 2-2, and the third state 2-3 are shown in Table 4. (Unit: mm)

[0113] Parameter 2-1 2-2 2-3 D1s (mm) 4.00 3.60 3.90 D1m (mm) 4.00 3.84 3.90 d3s (mm) 2.99 2.99 2.99 d4s (mm) 3.38 3.38 3.42 d4m (mm) 3.38 3.38 3.38 D4m (mm) 4.70 4.70 5.10 d5s (mm) 3.64 3.64 3.68 D5s (mm) 6.00 6.00 6.00 D5m (mm) 6.00 6.00 6.00 D6s (mm) 6.80 6.80 6.80 D6m (mm) 6.80 6.80 6.80 D7s (mm) 9.00 9.00 9.00 EP01 (mm) 0.64 0.61 0.61 EP12 (mm) 0.46 0.38 0.49 EP56 (mm) 0.57 0.57 0.57 EP67 (mm) 0.64 0.64 0.64 CP2 (mm) 0.02 0.02 0.02 CP5 (mm) 0.02 0.02 0.02 L (mm) 5.50 5.50 5.50

[0114] Table 4

[0115] In embodiment two, the object side S1 of the first lens is convex, the image side S2 of the first lens is concave. The object side S3 of the second lens is convex, the image side S4 of the second lens is concave. The object side S5 of the third lens is convex, the image side S6 of the third lens is concave. The object side S7 of the fourth lens is concave, the image side S8 of the fourth lens is convex. The object side S9 of the fifth lens is concave, the image side S10 of the fifth lens is concave. The object side S11 of the sixth lens is convex, the image side S12 of the sixth lens is concave. The object side S13 of the seventh lens is convex, the image side S14 of the seventh lens is convex. The object side S15 of the eighth lens is concave, the image side S16 of the eighth lens is concave.

[0116] In embodiment two, the total effective focal length f of the optical photographic lens is 5.60mm, the effective focal length f1 of the first lens is -111.36mm, the effective focal length f2 of the second lens is 4.96mm, the effective focal length f3 of the third lens is -12.50mm, the effective focal length f4 of the fourth lens is 4.95mm, the effective focal length f5 of the fifth lens is -6.41mm, the effective focal length f6 of the sixth lens is -19.80mm, the effective focal length f7 of the seventh lens is 5.20mm, the effective focal length f8 of the eighth lens is -3.21mm, the half of the diagonal length of the effective pixel area on the imaging plane of the optical photographic lens ImgH is 5.63mm, the on-axis distance SAG11 between the intersection of the object side of the first lens and the optical axis and the effective semi-diameter vertex of the object side of the first lens is 0.47mm, the on-axis distance SAG21 between the intersection of the object side of the second lens and the optical axis and the effective semi-diameter vertex of the object side of the second lens is 0.38mm, the on-axis distance SAG81 between the intersection of the object side of the eighth lens and the optical axis and the effective semi-diameter vertex of the object side of the eighth lens is -1.74mm.

[0117] Table 5 shows the basic structure parameter table of the optical photographic lens of embodiment two, wherein the units of the curvature radius, thickness / distance are millimeter mm.

[0118]

[0119] Table 5

[0120] Table 6 shows the polynomial coefficients of the aspherical surfaces in embodiment two, wherein each aspherical surface can be defined by the formula (1) given in embodiment one.

[0121]

[0122]

[0123] Table 6

[0124] Figure 12 A curve of axial chromatic aberration of the optical photography lens of embodiment two is shown, which represents the convergence point deviation of light rays of different wavelengths after passing through the optical photography lens. Figure 13 A curve of astigmatism of the optical photography lens of embodiment two is shown, which represents the meridional image curvature and sagittal image curvature. Figure 14 A curve of distortion of the optical photography lens of embodiment two is shown, which represents the distortion size values corresponding to different field angles. Figure 15 A curve of lateral chromatic aberration of the optical photography lens of embodiment two is shown, which represents the deviation of light rays on the imaging surface after passing through the optical photography lens.

[0125] According to Figures 12 to 15 It can be known that the optical photography lens given by embodiment two can achieve good imaging quality.

[0126] Embodiment three

[0127] As Figures 16 to 22 shown, the optical photography lens of embodiment three is described. Figure 16 A structure schematic diagram of the optical photography lens of embodiment three in a first state is shown, Figure 17 A structure schematic diagram of the optical photography lens of embodiment three in a second state is shown, Figure 18 A structure schematic diagram of the optical photography lens of embodiment three in a third state is shown.

[0128] As Figures 16 to 18 shown, the optical photography lens comprises a lens barrel P0 and, sequentially arranged in the lens barrel P0 from the object side to the image side along the optical axis of the lens barrel P0, a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fifth lens E5, a fifth spacer P5, a sixth lens E6, a sixth spacer P6, a seventh lens E7, a seventh spacer P7 and an eighth lens E8.

[0129] As Figure 16As shown, in the first state, the object side S1 of the first lens partially abuts against the barrel P0. The object side and the image side of the first spacer P1 partially abut against the image side S2 of the first lens and the object side S3 of the second lens, respectively. The object side and the image side of the second spacer P2 partially abut against the image side S4 of the second lens and the object side S5 of the third lens, respectively. The object side and the image side of the third spacer P3 partially abut against the image side S6 of the third lens and the object side S7 of the fourth lens, respectively. The object side and the image side of the fourth spacer P4 partially abut against the image side S8 of the fourth lens and the object side S9 of the fifth lens, respectively. The object side and the image side of the fifth spacer P5 partially abut against the image side S10 of the fifth lens and the object side S11 of the sixth lens, respectively. The object side and the image side of the sixth spacer P6 partially abut against the image side S12 of the sixth lens and the object side S13 of the seventh lens, respectively. The object side and the image side of the seventh spacer P7 partially abut against the image side S14 of the seventh lens and the object side S15 of the eighth lens, respectively. The outer periphery of each spacer abuts against the inner wall of the barrel P0.

[0130] As shown, in the second state, the abutting modes of the spacers are the same as those in the first state, and the relevant descriptions in the first state can be referred to and will not be repeated here. Figure 17

[0131] As shown, in the third state, the abutting modes of the spacers are the same as those in the first state, and the relevant descriptions in the first state can be referred to and will not be repeated here. Figure 18

[0132] In summary, the structural parameters of the optical photographing lens of embodiment three in the first state 3-1, the second state 3-2 and the third state 3-3 are shown in Table 7. (unit: mm)

[0133] Parameter 3-1 3-2 3-3 D1s (mm) 4.00 3.90 3.90 D1m (mm) 4.00 3.90 3.90 d3s (mm) 2.91 2.91 2.91 d4s (mm) 3.34 3.34 3.34 d4m (mm) 3.34 3.34 3.34 D4m (mm) 4.70 4.70 5.60 d5s (mm) 3.66 3.66 3.66 D5s (mm) 5.70 5.70 5.70 D5m (mm) 5.70 5.70 5.70 D6s (mm) 8.40 8.40 8.40 D6m (mm) 8.40 8.40 8.40 D7s (mm) 9.00 9.00 9.00 EP01 (mm) 0.64 0.59 0.59 EP12 (mm) 0.46 0.51 0.51 EP56 (mm) 0.67 0.67 0.67 EP67 (mm) 0.54 0.54 0.54 CP2 (mm) 0.02 0.02 0.02 CP5 (mm) 0.02 0.02 0.02 L (mm) 5.50 5.50 5.50

[0134] Table 7

[0135] In embodiment three, the object side S1 of the first lens is a convex surface, and the image side S2 of the first lens is a concave surface. The object side S3 of the second lens is a convex surface, and the image side S4 of the second lens is a concave surface. The object side S5 of the third lens is a convex surface, and the image side S6 of the third lens is a concave surface. The object side S7 of the fourth lens is a concave surface, and the image side S8 of the fourth lens is a convex surface. The object side S9 of the fifth lens is a concave surface, and the image side S10 of the fifth lens is a concave surface. The object side S11 of the sixth lens is a convex surface, and the image side S12 of the sixth lens is a concave surface. The object side S13 of the seventh lens is a convex surface, and the image side S14 of the seventh lens is a convex surface. The object side S15 of the eighth lens is a concave surface, and the image side S16 of the eighth lens is a concave surface. ​​

[0136] In embodiment three, the total effective focal length f of the optical photographic lens is 5.45mm, the effective focal length f1 of the first lens is -88.81mm, the effective focal length f2 of the second lens is 4.74mm, the effective focal length f3 of the third lens is -11.17mm, the effective focal length f4 of the fourth lens is 4.63mm, the effective focal length f5 of the fifth lens is -5.96mm, the effective focal length f6 of the sixth lens is -15.56mm, the effective focal length f7 of the seventh lens is 4.76mm, the effective focal length f8 of the eighth lens is -3.62mm, the half diagonal length of the effective pixel area on the imaging surface of the optical photographic lens ImgH is 5.13mm, the on-axis distance SAG11 between the intersection of the object side of the first lens and the optical axis and the effective semi-radius vertex of the object side of the first lens is 0.42mm, the on-axis distance SAG21 between the intersection of the object side of the second lens and the optical axis and the effective semi-radius vertex of the object side of the second lens is 0.38mm, and the on-axis distance SAG81 between the intersection of the object side of the eighth lens and the optical axis and the effective semi-radius vertex of the object side of the eighth lens is -1.67mm.

[0137] Table 8 shows the basic structure parameter table of the optical photographic lens of embodiment three, wherein the units of the curvature radius and the thickness / distance are millimeters mm.

[0138]

[0139] Table 8

[0140] Table 9 shows the polynomial coefficients of the aspherical surfaces that can be used in the optical photographic lens of embodiment three, wherein each aspherical surface can be defined by the formula (1) given in embodiment one.

[0141]

[0142]

[0143] Table 9

[0144] Figure 19 The on-axis chromatic aberration curve of the optical photographic lens of embodiment three is shown, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the optical photographic lens. Figure 20 The astigmatism curve of the optical photographic lens of embodiment three is shown, which represents the meridional image curvature and sagittal image curvature. Figure 21 The distortion curve of the optical photographic lens of embodiment three is shown, which represents the distortion size values corresponding to different field angles. Figure 22 The lateral chromatic aberration curve of the optical photographic lens of embodiment three is shown, which represents the deviation of the light rays on the imaging surface after passing through the optical photographic lens.

[0145] According toFigures 19 to 22 It can be seen that the optical photographic lens given in Embodiment Three can achieve good imaging quality.

[0146] Embodiment Four

[0147] As shown in Figures 23 to 29 , an optical photographic lens of Embodiment Four is described. Figure 23 A structural schematic diagram of the optical photographic lens of Embodiment Four in a first state is shown, Figure 24 a structural schematic diagram of the optical photographic lens of Embodiment Four in a second state is shown, Figure 25 and a structural schematic diagram of the optical photographic lens of Embodiment Four in a third state is shown.

[0148] As shown in Figures 23 to 25 , the optical photographic lens comprises a lens barrel P0 and, arranged in the lens barrel P0 in sequence from the object side to the image side along the optical axis of the lens barrel P0, a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fifth lens E5, a fifth spacer P5, a sixth lens E6, a sixth spacer P6, a seventh lens E7, a seventh spacer P7, and an eighth lens E8.

[0149] As shown in Figure 23 , in the first state, the object side surface S1 of the first lens partially abuts against the lens barrel P0. The object side surface and the image side surface of the first spacer P1 partially abut against the image side surface S2 of the first lens and the object side surface S3 of the second lens, respectively. The object side surface and the image side surface of the second spacer P2 partially abut against the image side surface S4 of the second lens and the object side surface S5 of the third lens, respectively. The object side surface and the image side surface of the third spacer P3 partially abut against the image side surface S6 of the third lens and the object side surface S7 of the fourth lens, respectively. The object side surface and the image side surface of the fourth spacer P4 partially abut against the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens, respectively. The object side surface and the image side surface of the fifth spacer P5 partially abut against the image side surface S10 of the fifth lens and the object side surface S11 of the sixth lens, respectively. The object side surface and the image side surface of the sixth spacer P6 partially abut against the image side surface S12 of the sixth lens and the object side surface S13 of the seventh lens, respectively. The object side surface and the image side surface of the seventh spacer P7 partially abut against the image side surface S14 of the seventh lens and the object side surface S15 of the eighth lens, respectively. The outer periphery of each spacer abuts against the inner wall surface of the lens barrel P0.

[0150] As shown in Figure 24 , in the second state, the abutting abutment modes of the spacers are the same as those in the first state, and the relevant description in the first state can be referred to, which will not be repeated here.

[0151] As shown in Figure 25As shown, in the third state, the abutting manner of each spacer is the same as that in the first state, and the relevant description in the first state can be referred to, which will not be repeated here.

[0152] In summary, the structural parameters of the optical photographing lens of embodiment four in the first state 4-1, the second state 4-2 and the third state 4-3 are shown in Table 10. (unit: mm)

[0153] Parameter 4-1 4-2 4-3 D1s (mm) 3.90 3.90 3.90 D1m (mm) 3.90 3.90 3.90 d3s (mm) 2.87 2.87 2.87 d4s (mm) 3.43 3.25 3.25 d4m (mm) 3.81 3.25 3.25 D4m (mm) 4.16 4.20 5.00 d5s (mm) 3.74 3.74 3.78 D5s (mm) 6.00 6.00 6.00 D5m (mm) 6.00 6.00 6.00 D6s (mm) 8.40 8.40 8.40 D6m (mm) 8.40 8.40 8.40 D7s (mm) 9.00 9.00 9.00 EP01 (mm) 0.60 0.60 0.60 EP12 (mm) 0.37 0.37 0.37 EP56 (mm) 0.55 0.55 0.55 EP67 (mm) 0.54 0.54 0.54 CP2 (mm) 0.02 0.02 0.02 CP5 (mm) 0.02 0.02 0.02 L (mm) 5.50 5.50 5.50

[0154] Table 10

[0155] In embodiment four, the object side S1 of the first lens is a convex surface, and the image side S2 of the first lens is a concave surface. The object side S3 of the second lens is a convex surface, and the image side S4 of the second lens is a concave surface. The object side S5 of the third lens is a convex surface, and the image side S6 of the third lens is a concave surface. The object side S7 of the fourth lens is a concave surface, and the image side S8 of the fourth lens is a convex surface. The object side S9 of the fifth lens is a concave surface, and the image side S10 of the fifth lens is a concave surface. The object side S11 of the sixth lens is a convex surface, and the image side S12 of the sixth lens is a concave surface. The object side S13 of the seventh lens is a convex surface, and the image side S14 of the seventh lens is a convex surface. The object side S15 of the eighth lens is a concave surface, and the image side S16 of the eighth lens is a concave surface.

[0156] In embodiment four, the total effective focal length f of the optical photographing lens is 5.74 mm, the effective focal length f1 of the first lens is -70.72 mm, the effective focal length f2 of the second lens is 5.01 mm, the effective focal length f3 of the third lens is -13.45 mm, the effective focal length f4 of the fourth lens is 4.86 mm, the effective focal length f5 of the fifth lens is -6.68 mm, the effective focal length f6 of the sixth lens is -24.17 mm, the effective focal length f7 of the seventh lens is 5.86 mm, the effective focal length f8 of the eighth lens is -3.18 mm, the half of the diagonal line length of the effective pixel area on the imaging surface of the optical photographing lens ImgH is 5.35 mm, the on-axis distance SAG11 between the intersection of the object side of the first lens and the optical axis and the effective radius vertex of the object side of the first lens is 0.44 mm, the on-axis distance SAG21 between the intersection of the object side of the second lens and the optical axis and the effective radius vertex of the object side of the second lens is 0.30 mm, and the on-axis distance SAG81 between the intersection of the object side of the eighth lens and the optical axis and the effective radius vertex of the object side of the eighth lens is -1.66 mm.

[0157] Table 11 shows the basic structural parameter table of the optical photographing lens of embodiment four, wherein the units of the curvature radius and the thickness / distance are millimeters mm.

[0158]

[0159] Table 11

[0160] Table 12 shows polynomial coefficients of various aspherical surfaces used in the optical photographic lens of Example Four, wherein each aspherical surface type can be defined by the formula (1) given in Example One above.

[0161]

[0162]

[0163] Table 12

[0164] Figure 26 The axial chromatic aberration curve of the optical photographic lens of Example Four is shown, which represents the convergence point deviation of light rays of different wavelengths after passing through the optical photographic lens. Figure 27 The astigmatism curve of the optical photographic lens of Example Four is shown, which represents the meridional image curvature and sagittal image curvature. Figure 28 The distortion curve of the optical photographic lens of Example Four is shown, which represents the distortion size values corresponding to different field angles. Figure 29 The lateral chromatic aberration curve of the optical photographic lens of Example Four is shown, which represents the deviation of light rays on the imaging plane after passing through the optical photographic lens at different image heights.

[0165] According to Figures 26 to 29 It can be seen that the optical photographic lens given in Example Four can achieve good imaging quality.

[0166] In summary, Examples One to Four respectively satisfy the relationships shown in Table 13.

[0167]

[0168]

[0169] Table 13

[0170] It should be noted that 1-1 in Table 13 represents the optical photographic lens in Example One in the first state, 1-2 represents the optical photographic lens in Example One in the second state, 1-3 represents the optical photographic lens in Example One in the third state, 2-1 represents the optical photographic lens in Example Two in the first state, 2-2 represents the optical photographic lens in Example Two in the second state, 2-3 represents the optical photographic lens in Example Two in the third state, 3-1 represents the optical photographic lens in Example Three in the first state, 3-2 represents the optical photographic lens in Example Three in the second state, 3-3 represents the optical photographic lens in Example Three in the third state, 4-1 represents the optical photographic lens in Example Four in the first state, 4-2 represents the optical photographic lens in Example Four in the second state, and 4-3 represents the optical photographic lens in Example Four in the third state.

[0171] The present application also provides an imaging device, the electronic photosensitive element of which can be a charge coupled device (CCD) or a complementary metal-oxide semiconductor (CMOS). The imaging device can be a stand-alone imaging apparatus such as a digital camera, or an imaging module integrated in a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical camera lens described above.

[0172] However, the above-described embodiments are only some of the embodiments of the present application, but not all. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative work should fall within the protection scope of the present application.

[0173] It should be noted that the terms used herein are only used to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, work, device, component and / or combination thereof.

[0174] It should be noted that the terms "first", "second", and the like used in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0175] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An optical photographic lens characterized by, The optical photographic lens comprises a lens barrel and, sequentially arranged along an optical axis of the lens barrel from an object side to an image side in the lens barrel, a first lens with negative refractive power, a second lens with positive refractive power, a third lens with negative refractive power, a fourth lens with positive refractive power, a fifth lens with negative refractive power, a sixth lens with negative refractive power, a seventh lens with positive refractive power, and an eighth lens with negative refractive power, and the total number of lenses with refractive power in the optical photographic lens is eight; wherein the object side surface of the first lens is convex, the image side surface of the first lens is concave, the object side surface of the second lens is convex, the image side surface of the second lens is concave, the object side surface of the third lens is convex, the image side surface of the third lens is concave, the object side surface of the fourth lens is concave, the image side surface of the fourth lens is convex, the object side surface of the fifth lens is concave, the image side surface of the fifth lens is concave, the object side surface of the sixth lens is convex, the image side surface of the sixth lens is concave, the object side surface of the seventh lens is convex, the image side surface of the seventh lens is convex, the object side surface of the eighth lens is concave, and the image side surface of the eighth lens has an inflection point; The optical photographic lens further comprises a plurality of spacers, and the plurality of spacers at least comprises a sixth spacer located between the sixth lens and the seventh lens and in contact with the image side surface of the sixth lens, and a seventh spacer located between the seventh lens and the eighth lens and in contact with the image side surface of the seventh lens; The effective focal length f1 of the first lens, the outer diameter D1s of the object side surface of the first spacer, and the outer diameter D1m of the image side surface of the first spacer satisfy: -14.97≤f1 / (D1s+D1m)≤-3.80; The maximum height of the lens barrel, i.e., the axial distance L from the object side end surface of the lens barrel to the image side end surface of the lens barrel, and half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical photographic lens satisfy: 0.98≤L / ImgH<1.1; The on-axis distance SAG81 between the intersection of the object side surface of the eighth lens and the optical axis and the effective radius vertex of the object side surface of the eighth lens, and the interval EP67 between the sixth spacer and the seventh spacer satisfy: -3.95≤SAG81 / EP67≤-2.

57.

2. The photographic optical lens according to claim 1, characterized in that, The plurality of spacers further comprises a first spacer located between the first lens and the second lens and in contact with the image side surface of the first lens, The interval EP01 between the object side end surface of the lens barrel and the first spacer, and the central thickness CT1 of the first lens on the optical axis satisfy: 1.71≤EP01 / CT1≤2.

29.

3. The photographic optical lens according to claim 1, characterized in that, The plurality of spacers further comprises a second spacer located between the second lens and the third lens and in contact with the image side surface of the second lens, An air separation T23 on the optical axis of the second lens and the third lens and a maximum thickness CP2 of the second spacer satisfy: 1.67 ≤ T23 / CP2 ≤ 1.

90.

4. The photographic optical lens according to claim 1, characterized in that, The plurality of spacers further include a first spacer located between the first lens and the second lens and in contact with an image side surface of the first lens, a second spacer located between the second lens and the third lens and in contact with an image side surface of the second lens, A separation EP12 between the first spacer and the second spacer, an on-axis distance SAG11 between an intersection of an object side surface of the first lens and the optical axis and an effective radius vertex of the object side surface of the first lens, and an on-axis distance SAG21 between an intersection of an object side surface of the second lens and the optical axis and an effective radius vertex of the object side surface of the second lens satisfy: 2.80 ≤ EP12 / (SAG11-SAG21) ≤ 12.

19.

5. The photographic optical lens according to claim 1, characterized in that, The plurality of spacers further include a third spacer located between the third lens and the fourth lens and in contact with an image side surface of the third lens, a fourth spacer located between the fourth lens and the fifth lens and in contact with an image side surface of the fourth lens, An effective focal length f3 of the third lens and an inner diameter d3s of an object side surface of the third spacer satisfy: -5.81 ≤ f3 / d3s ≤ -3.84; An effective focal length f4 of the fourth lens and an inner diameter d4s of an object side surface of the fourth spacer satisfy: 1.29 ≤ f4 / d4s ≤ 1.

57.

6. The photographic optical lens according to claim 1, characterized in that, An edge position of an image side surface of the sixth lens has a surface shape opposite to that of a center position of the image side surface of the sixth lens.

7. The photographic optical lens according to claim 1, characterized in that, A combined focal length f78 of the seventh lens and the eighth lens, an outer diameter D7s of an object side surface of the seventh spacer, and an outer diameter D6m of an image side surface of the sixth spacer satisfy: -25.85 ≤ f78 / (D7s-D6m) ≤ 67.

51.

8. The photographic optical lens according to claim 1, characterized in that, The plurality of spacers further include a fifth spacer located between the fifth lens and the sixth lens and in contact with an image side surface of the fifth lens, An air separation T56 on the optical axis of the fifth lens and the sixth lens and a maximum thickness CP5 of the fifth spacer satisfy: 8.69 ≤ T56 / CP5 ≤ 18.

18.

9. The photographic optical lens according to claim 1, wherein, The plurality of spacers further include a fifth spacer located between the fifth lens and the sixth lens and in contact with an image side surface of the fifth lens, An effective focal length f5 of the fifth lens, a refractive index N5 of the fifth lens, an outer diameter D6s of an object side surface of the sixth spacer, and an outer diameter D5m of an image side surface of the fifth spacer satisfy: -12.34 ≤ f5*N5 / (D6s-D5m) ≤ 19.

59.

10. The photographic optical lens according to claim 1, characterized in that, The plurality of spacers further include a fifth spacer located between the fifth lens and the sixth lens and in contact with an image side surface of the fifth lens, An on-axis distance between an intersection of the sixth lens image-side surface and the optical axis and an effective radius vertex of the sixth lens image-side surface SAG62 satisfies: -2.99 ≤ EP56 / SAG62 ≤ -1.

88.

11. The photographic optical lens according to claim 1, characterized in that, An effective focal length of the fourth lens f4 and an effective focal length of the fifth lens f5 satisfy: -0.90 ≤ f4 / f5 ≤ -0.

73.

12. The photographic optical lens according to claim 11, characterized in that, The plurality of spacers further include a fourth spacer between the fourth lens and the fifth lens and in contact with an image-side surface of the fourth lens, a fifth spacer between the fifth lens and the sixth lens and in contact with an image-side surface of the fifth lens, An outer diameter of the fourth spacer image-side surface D4m, an inner diameter of the fourth spacer image-side surface d4m, an outer diameter of the fifth spacer object-side surface D5s, and an inner diameter of the fifth spacer object-side surface d5s satisfy: (D4m-d4m) < (D5s-d5s).

Images