Optical lens

Abstract

The application provides an optical lens. The optical lens comprises a lens barrel, a lens set and a spacer element set assembled in the lens barrel, and the maximum height L of the lens barrel, the sum of air intervals of any two adjacent lenses in the lens set on the optical axis ΣAT satisfy: 2.53<=L / ΣAT<=3.12; the effective focal length f2 of the second lens, the air interval T12 of the first lens and the second lens on the optical axis satisfy: -19.89<=f2 / T12<=-16.02; the inner diameter d1m of the image side surface of the first spacer element, the interval distance EP12 of the image side surface of the first spacer element and the object side surface of the second spacer element on the optical axis direction satisfy: 4.06<=d1m / EP12<=7.0. The application solves the problem that the edge field dispersion is intensified in order to meet the miniaturization requirement in the prior art.

Description

TECHNICAL FIELD

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

[0002] With the continuous development of electronic products, users' requirements for electronic products are constantly improving, and electronic products are required to be more lightweight and thin. The optical lens mounted on the electronic product is also gradually developing in the direction of lightweight and thin. The air gap between the lenses of the optical lens is small. When the light incident angle of the edge field of view is large, the light will be deflected at a large angle. The defocusing deviation and scattering of the light will cause uneven sensitivity, making the sensitivity distribution of the entire optical lens unreasonable, thereby increasing the sensitivity of the entire imaging system, causing the edge field of view to be scattered intensively, and affecting the quality of imaging.

[0003] That is, the optical lens in the prior art has the problem that the edge field of view is scattered intensively in order to meet the demand for miniaturization. SUMMARY

[0004] The main purpose of the present application is to provide an optical lens to solve the problem that the optical lens in the prior art has the problem that the edge field of view is scattered intensively in order to meet the demand for miniaturization.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present application, an optical lens is provided, comprising a lens barrel, a lens group and a spacer element group assembled in the lens barrel, the lens group is composed of eight lenses, the lens group sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens along the optical axis direction from the object side to the image side, the second lens has a negative focal length; the spacer element group at least comprises a first spacer element and a second spacer element, the first spacer element is located between the first lens and the second lens and in contact with the image side surface of the first lens, the second spacer element is located between the second lens and the third lens and in contact with the image side surface of the second lens; the maximum height L of the lens barrel, the sum ∑AT of the air gaps of any two adjacent lenses in the lens group on the optical axis satisfy: 2.53≤L / ∑AT≤3.12; the effective focal length f2 of the second lens, the air gap T12 of the first lens and the second lens on the optical axis satisfy: -19.89≤f2 / T12≤-16.02; the inner diameter d1m of the image side surface of the first spacer element, the interval distance EP12 of the image side surface of the first spacer element and the object side surface of the second spacer element in the optical axis direction satisfy: 4.06≤d1m / EP12≤7.0.

[0006] According to another aspect of the present application, there is provided an optical lens comprising a lens barrel, a lens group and a spacer group assembled in the lens barrel, the lens group consisting of eight lenses, the lens group comprising, in order from the object side to the image side along the optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens, the second lens having a negative refractive power; the spacer group comprising at least a first spacer and a second spacer, the first spacer being located between the first lens and the second lens and contacting the image side surface of the first lens, the second spacer being located between the second lens and the third lens and contacting the image side surface of the second lens; the maximum height L of the lens barrel and the sum ∑AT of the air spacings of any two adjacent lenses in the lens group on the optical axis satisfying: 2.53≤L / ∑AT≤3.12; the effective focal length f2 of the second lens and the air spacing T12 of the first lens and the second lens on the optical axis satisfying: -19.89≤f2 / T12≤-16.02; the inner diameter d1s of the object side surface of the first spacer, the outer diameter D0s of the object side end surface of the lens barrel and the inner diameter d0s of the object side end surface of the lens barrel satisfying: 1.43≤d1s / (D0s-d0s)≤3.68.

[0007] According to another aspect of the present application, there is provided an optical lens comprising a lens barrel, a lens group and a spacer group assembled in the lens barrel, the lens group consisting of eight lenses, the lens group comprising, in order from the object side to the image side along the optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens, the first lens having a positive refractive power, the second lens having a negative refractive power; the spacer group comprising at least a first spacer and a second spacer, the first spacer being located between the first lens and the second lens and contacting the image side surface of the first lens, the second spacer being located between the second lens and the third lens and contacting the image side surface of the second lens; the maximum height L of the lens barrel and the sum ∑AT of the air spacings of any two adjacent lenses in the lens group on the optical axis satisfying: 2.53≤L / ∑AT≤3.12; the effective focal length f2 of the second lens and the air spacing T12 of the first lens and the second lens on the optical axis satisfying: -19.89≤f2 / T12≤-16.02; the effective focal length f1 of the first lens, the refractive index N1 of the first lens and the inner diameter d1s of the object side surface of the first spacer satisfying: 6.59≤f1*N1 / d1s≤9.01.

[0008] Further, the inner diameter d1s of the object side surface of the first spacer, the outer diameter D1m of the image side surface of the first spacer, the inner diameter d2s of the object side surface of the second spacer and the outer diameter D2m of the image side surface of the second spacer satisfy: 0.87≤(D2m-d2s) / (D1m-d1s)≤2.31.

[0009] Further, an inner diameter d0m of the image-side end surface of the lens barrel, and an effective focal length f8 of the eighth lens satisfy -1.40 ≤ d0m / f8 ≤ 0.07.

[0010] Further, an inner diameter d1s of the object-side surface of the first spacer element, an outer diameter D0s of the object-side end surface of the lens barrel, and an inner diameter d0s of the object-side end surface of the lens barrel satisfy 1.43 ≤ d1s / (D0s-d0s) ≤ 3.68.

[0011] Further, the image-side surface of the fifth lens is a convex surface, the spacer element group further includes a fifth spacer element, the fifth spacer element is located between the fifth lens and the sixth lens and partially contacts the image-side surface of the fifth lens, an outer diameter D5s of the object-side surface of the fifth spacer element, and a curvature radius R10 of the image-side surface of the fifth lens satisfy -2.97 ≤ D5s / R10 ≤ -1.21.

[0012] Further, the third lens has positive refractive power, the spacer element group further includes a second spacer element and a third spacer element, the second spacer element is located between the second lens and the third lens and partially contacts the image-side surface of the second lens, the third spacer element is located between the third lens and the fourth lens and partially contacts the image-side surface of the third lens, a separation distance EP23 of the image-side surface of the second spacer element and the object-side surface of the third spacer element in the optical axis direction, an effective focal length f3 of the third lens, and a central thickness CT3 of the third lens in the optical axis satisfy 1.97 ≤ f3 / (EP23+CT3) ≤ 2.99.

[0013] Further, the spacer element group further includes a second spacer element and a third spacer element, the second spacer element is located between the second lens and the third lens and partially contacts the image-side surface of the second lens, the third spacer element is located between the third lens and the fourth lens and partially contacts the image-side surface of the third lens, a separation distance EP23 of the image-side surface of the second spacer element and the object-side surface of the third spacer element in the optical axis direction, an outer diameter D3s of the object-side surface of the third spacer element, and an inner diameter d3s of the object-side surface of the third spacer element satisfy 1.62 ≤ (D3s-d3s) / EP23 ≤ 4.92.

[0014] Further, the fourth lens has negative refractive power, the spacer element group further includes a third spacer element and a fourth spacer element, the third spacer element is located between the third lens and the fourth lens and partially contacts the image-side surface of the third lens, the fourth spacer element is located between the fourth lens and the fifth lens and partially contacts the image-side surface of the fourth lens, a separation distance EP34 of the image-side surface of the third spacer element and the object-side surface of the fourth spacer element in the optical axis direction, and an effective focal length f4 of the fourth lens satisfy -7.68 ≤ f4 / EP34 ≤ -4.90.

[0015] Further, the spacer element group further includes a third spacer element and a fourth spacer element, the third spacer element is located between the third lens and the fourth lens and contacts the image side surface portion of the third lens, the fourth spacer element is located between the fourth lens and the fifth lens and contacts the image side surface portion of the fourth lens, a distance EP34 between the image side surface of the third spacer element and the object side surface of the fourth spacer element in the optical axis direction, a sum ∑EP of a distance between the object side end surface of the lens barrel and any two adjacent optical elements in the spacer element group in the optical axis direction satisfy: 4.86≤∑EP / EP34≤5.66.

[0016] Further, the spacer element group further includes a fourth spacer element and a fifth spacer element, the fourth spacer element is located between the fourth lens and the fifth lens and contacts the image side surface portion of the fourth lens, the fifth spacer element is located between the fifth lens and the sixth lens and contacts the image side surface portion of the fifth lens, a distance EP45 between the image side surface of the fourth spacer element and the object side surface of the fifth spacer element in the optical axis direction, a central thickness CT5 of the fifth lens in the optical axis direction, a thickness CP5 of the fifth spacer element in the optical axis direction satisfy: 1.10≤CT5 / (EP45+CP5)≤3.37.

[0017] Further, the fifth lens has positive refractive power, the spacer element group further includes a fourth spacer element and a fifth spacer element, the fourth spacer element is located between the fourth lens and the fifth lens and contacts the image side surface portion of the fourth lens, the fifth spacer element is located between the fifth lens and the sixth lens and contacts the image side surface portion of the fifth lens, an inner diameter d4m of the image side surface of the fourth spacer element, an inner diameter d5s of the object side surface of the fifth spacer element, an effective focal length f5 of the fifth lens satisfy: 1.78≤(d4m+d5s) / f5≤3.09.

[0018] Further, the image side surface of the sixth lens is a convex surface, the spacer element group further includes a sixth spacer element, the sixth spacer element is located between the sixth lens and the seventh lens and contacts the image side surface portion of the sixth lens, an inner diameter d6s of the object side surface of the sixth spacer element, a curvature radius R12 of the image side surface of the sixth lens, a refractive index N6 of the sixth lens satisfy: -2.86≤d6s / R12≤-0.94.

[0019] Further, the image side surface of the seventh lens is a concave surface, the spacer element group further includes a seventh spacer element, the seventh spacer element is located between the seventh lens and the eighth lens and contacts the image side surface portion of the seventh lens, an inner diameter d7s of the object side surface of the seventh spacer element, a curvature radius R13 of the object side surface of the seventh lens, a curvature radius R14 of the image side surface of the seventh lens satisfy: -2.70≤d7s / (R13+R14)≤0.61.

[0020] Further, the seventh lens has negative refractive power, the group of spacer elements further comprises a seventh spacer element, the seventh spacer element is located between the seventh lens and the eighth lens and contacts an image-side portion of the seventh lens, and a combination focal length f78 of the seventh lens and the eighth lens, an outer diameter D7s of an object-side surface of the seventh spacer element, and an inner diameter d7s of the object-side surface of the seventh spacer element satisfy: -4.45 ≤ f78 / (D7s-d7s) ≤ -1.55.

[0021] Further, the group of spacer elements further comprises a seventh spacer element and an eighth spacer element, the seventh spacer element is located between the seventh lens and the eighth lens and contacts an image-side portion of the seventh lens, the eighth spacer element is located on an image-side of the eighth lens and contacts an image-side portion of the eighth lens, an interval distance EP78 between an image-side surface of the seventh spacer element and an object-side surface of the eighth spacer element, an outer diameter D8s of the object-side surface of the eighth spacer element, and an inner diameter d8s of the object-side surface of the eighth spacer element satisfy: 1.91 ≤ EP78 / (D8s-d8s) ≤ 2.53.

[0022] Further, the optical lens satisfies at least one of the following:

[0023] The first lens has positive refractive power, an object-side surface of the first lens is convex, and an image-side surface of the first lens is concave.

[0024] An object-side surface of the second lens is concave, and an image-side surface of the second lens is convex.

[0025] An object-side surface of the third lens is convex.

[0026] An object-side surface of the fourth lens is concave.

[0027] An object-side surface of the fifth lens is convex.

[0028] An object-side surface of the sixth lens is concave.

[0029] An object-side surface of the eighth lens is concave.

[0030] The optical lens comprises a lens barrel, a lens set and a spacer element set assembled in the lens barrel, the lens set is composed of eight lenses, the lens set sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens from the object side to the image side along the optical axis, the spacer element set comprises at least a first spacer element and a second spacer element, the first spacer element is located between the first lens and the second lens and is in contact with the image side surface of the first lens, the second lens has a negative focal length, and the second spacer element is located between the second lens and the third lens and is in contact with the image side surface of the second lens, the maximum height L of the lens barrel and the sum of the air gaps of any two adjacent lenses in the lens set on the optical axis satisfy 2.53<=L / sum of air gaps<=3.12, the effective focal length f2 of the second lens and the air gap T12 of the first lens and the second lens on the optical axis satisfy -19.89<=f2 / T12<=-16.02, and the inner diameter d1m of the image side surface of the first spacer element and the interval distance EP12 of the image side surface of the first spacer element and the object side surface of the second spacer element in the optical axis direction satisfy 4.06<=d1m / EP12<=7.0.

[0031] The optical lens of the present application is composed of a lens barrel, eight lenses and at least two spacer elements, by reasonably setting the optical lens, the maximum height L of the lens barrel and the sum of the air gaps of any two adjacent lenses in the lens set on the optical axis satisfy 2.53<=L / sum of air gaps<=3.12, the effective focal length f2 of the second lens and the air gap T12 of the first lens and the second lens on the optical axis satisfy -19.89<=f2 / T12<=-16.02, the overall size and air gap of the optical lens are constrained to ensure the miniaturization of the optical lens, in the design of the miniaturized optical lens, the size control of the optical lens is closely related to the dispersion degree of the defocus curve, due to the limitation of the lens size and the gap, the edge ray deflection angle of the second lens increases during assembly adjustment, which finally affects the smoothness of the defocus curve, the defocus curve may present a large dispersion, which will cause unstable system imaging performance, and the second lens will have a large impact on the optical path difference of different fields of view, resulting in edge dispersion, in order to solve the problem, the present application constrains d1m / EP12 within a reasonable range, which can ensure that the light beam has a proper beam width when passing through the first spacer element, avoid the scattering or defocusing of the edge light due to the too large refraction angle of the edge light, and avoid the too large gap between the first spacer element and the second spacer element, effectively reducing the influence of mechanical tolerance on the defocus curve and ensuring the stability of the imaging performance of the optical lens. BRIEF DESCRIPTION OF DRAWINGS

[0032] The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the application, and are incorporated in and constitute a part of this specification, the illustrative embodiments of the application, and their description, serve to explain the application. In the drawings:

[0033] Figure 1 A size annotation diagram of an optical lens of an optional embodiment of the present application is shown;

[0034] Figure 2 A structure schematic diagram of an optical lens of embodiment 1-1 of the present application is shown;

[0035] Figure 3 A structure schematic diagram of an optical lens of embodiment 1-2 of the present application is shown;

[0036] Figure 4 A structure schematic diagram of an optical lens of embodiment 1-3 of the present application is shown;

[0037] Figures 5 to 8 A magnification chromatic aberration curve, an on-axis chromatic aberration curve, a distortion curve and a stigmation curve of the optical lens of embodiment one of the present application are shown respectively;

[0038] Figure 9 A structure schematic diagram of an optical lens of embodiment 2-1 of the present application is shown;

[0039] Figure 10 A structure schematic diagram of an optical lens of embodiment 2-2 of the present application is shown;

[0040] Figure 11 A structure schematic diagram of an optical lens of embodiment 2-3 of the present application is shown;

[0041] Figures 12 to 15 A magnification chromatic aberration curve, an on-axis chromatic aberration curve, a distortion curve and a stigmation curve of the optical lens of embodiment two of the present application are shown respectively;

[0042] Figure 16 A structure schematic diagram of an optical lens of embodiment 3-1 of the present application is shown;

[0043] Figure 17 A structure schematic diagram of an optical lens of embodiment 3-2 of the present application is shown;

[0044] Figure 18 A structure schematic diagram of an optical lens of embodiment 3-3 of the present application is shown;

[0045] Figures 19 to 22 A magnification chromatic aberration curve, an on-axis chromatic aberration curve, a distortion curve and a stigmation curve of the optical lens of embodiment three of the present application are shown respectively;

[0046] Figure 23A plot of the diffraction-limited modulation curve of an optical lens of one alternative embodiment of the present application is shown;

[0047] Figure 24 A plot of the diffraction-limited modulation curve of an optical lens of another alternative embodiment of the present application is shown;

[0048] Figure 25 A plot of the diffraction-limited modulation curve of an optical lens of one example is shown;

[0049] Figure 26 A plot of the diffraction-limited modulation curve of an optical lens of another example is shown.

[0050] Wherein, the above figures include the following reference signs:

[0051] E1, first lens; P1, first spacer element; E2, second lens; P2, second spacer element; E3, third lens; P3, third spacer element; E4, fourth lens; P4, fourth spacer element; E5, fifth lens; P5, fifth spacer element; E6, sixth lens; P6, sixth spacer element; E7, seventh lens; P7, seventh spacer element; E8, eighth lens; P8, eighth spacer element; S1, object side surface of the first lens; S2, image side surface of the first lens; S3, object side surface of the second lens; S4, image side surface of the second lens; S5, object side surface of the third lens; S6, image side surface of the third lens; S7, object side surface of the fourth lens; S8, image side surface of the fourth lens; S9, object side surface of the fifth lens; S10, image side surface of the fifth lens; S11, object side surface of the sixth lens; S12, image side surface of the sixth lens; S13, object side surface of the seventh lens; S14, image side surface of the seventh lens; S15, object side surface of the eighth lens; S16, image side surface of the eighth lens. DETAILED DESCRIPTION

[0052] It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict, and the present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0053] 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 person in the technical field to which the present application belongs.

[0054] In the present application, unless otherwise specified, 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; 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.

[0055] It should be noted that the terms first, second, third, etc. in the present specification 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 technical solutions of the present application.

[0056] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. 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 drawn strictly to scale.

[0057] In the present specification, the paraxial region refers to a 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 made according to the judgment method of those skilled in the art, with the 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) being positive or negative to judge the convexity or concavity. In terms of the object side surface, 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 image side surface, 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. In the present application, the left side is the object side and the right side is the image side. The object side surface of the spacer element refers to the surface of the spacer element located at the most object side and perpendicular to the optical axis, the image side surface of the spacer element refers to the surface of the spacer element located at the most image side and perpendicular to the optical axis, the object side end surface of the lens barrel refers to the surface of the lens barrel located at the most object side and perpendicular to the optical axis, and the image side end surface of the lens barrel refers to the surface of the lens barrel located at the most image side and perpendicular to the optical axis.

[0058] In order to solve the problem that the edge field dispersion is aggravated due to the miniaturization requirement in the prior art optical lens, the present application provides an optical lens.

[0059] As Figures 1 to 22As shown, the optical lens comprises a lens barrel, a lens group and a spacer element group assembled in the lens barrel, the lens group is composed of eight lenses, the lens group sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens from the object side to the image side along the optical axis, the second lens has a negative focal length; the spacer element group at least comprises a first spacer element and a second spacer element, the first spacer element is located between the first lens and the second lens and in contact with the image side surface of the first lens, the second spacer element is located between the second lens and the third lens and in contact with the image side surface of the second lens; the maximum height L of the lens barrel, the sum ∑AT of the air gaps of any two adjacent lenses in the lens group on the optical axis satisfy: 2.53≤L / ∑AT≤3.12; the effective focal length f2 of the second lens, the air gap T12 of the first lens and the second lens on the optical axis satisfy: -19.89≤f2 / T12≤-16.02; the inner diameter d1m of the image side surface of the first spacer element, the interval distance EP12 of the image side surface of the first spacer element and the object side surface of the second spacer element in the optical axis direction satisfy: 4.06≤d1m / EP12≤7.0.

[0060] The optical lens of the present application is composed of a lens barrel, eight lenses and at least two spacer elements. By reasonably setting the optical lens, when the maximum height L of the lens barrel, the sum ∑AT of the air gaps of any two adjacent lenses in the lens group on the optical axis satisfy: 2.53≤L / ∑AT≤3.12; the effective focal length f2 of the second lens, the air gap T12 of the first lens and the second lens on the optical axis satisfy: -19.89≤f2 / T12≤-16.02, the overall size and air gap of the optical lens are constrained to ensure the miniaturization of the optical lens. In the design of the miniaturized optical lens, the size control of the optical lens is closely related to the dispersion degree of the defocus curve. Due to the limitation of lens size and gap, the edge ray deflection angle of the second lens increases during assembly adjustment, which finally affects the smoothness of the defocus curve. The defocus curve may present a large dispersion, which will cause unstable system imaging performance. At the same time, the second lens will have a large impact on the optical path difference of different fields of view, resulting in edge dispersion. In order to solve this problem, the present application constrains d1m / EP12 within a reasonable range, which can ensure that the light beam has a proper beam width when passing through the first spacer element, avoid the scattering or defocusing of the edge light due to the excessive refraction angle of the edge light, and at the same time avoid the excessive gap between the first spacer element and the second spacer element, effectively reducing the influence of mechanical tolerance on the defocus curve and ensuring the stability of the imaging performance of the optical lens.

[0061] In addition, refer to Table 1 and Figures 23 to 26 As shown, Figure 23A diffraction-limited modulation curve is shown, which satisfies L / ∑AT = 2.8, f2 / T12 = -17.2, d1m / EP12 = 4.55, wherein the abscissa is the defocus position, in mm; the ordinate is the modulation value, dimensionless. Figure 24 A diffraction-limited modulation curve is shown, which satisfies L / ∑AT = 2.8, f2 / T12 = -17.2, d1m / EP12 = 5.78. It can be seen that when d1m / EP12 is greater than 7.0, the interval distance of the first interval element and the second interval element in the optical axis direction is too small, the refraction angle of the edge light is too large, the light refraction is steep, and the edge field dispersion is intensified. Figure 23 And Figure 24 It can be seen that when 4.06 ≤ d1m / EP12 ≤ 7.0, the size of the first interval element and the size of the first interval element and the second interval element are reasonably designed, and the defocus curve is normal. Figure 25 A diffraction-limited modulation curve is shown, which satisfies L / ∑AT = 2.8, f2 / T12 = -17.2, d1m / EP12 = 1.35. It can be seen that when d1m / EP12 is less than 4.06, the interval distance of the first interval element and the second interval element in the optical axis direction is too large, the sensitivity of the optical lens is high, the edge light angle changes sharply, and the edge field appears discrete. Figure 25 It can be seen that when d1m / EP12 is less than 4.06, the interval distance of the first interval element and the second interval element in the optical axis direction is too large, the sensitivity of the optical lens is high, the edge light angle changes sharply, and the edge field appears discrete. Figure 26 A diffraction-limited modulation curve is shown, which satisfies L / ∑AT = 2.8, f2 / T12 = -17.2, d1m / EP12 = 8.58. It can be seen that when d1m / EP12 is greater than 7.0, the interval distance of the first interval element and the second interval element in the optical axis direction is too small, the refraction angle of the edge light is too large, the light refraction is steep, and the edge field dispersion is intensified. Figure 26 It can be seen that when d1m / EP12 is greater than 7.0, the interval distance of the first interval element and the second interval element in the optical axis direction is too small, the refraction angle of the edge light is too large, the light refraction is steep, and the edge field dispersion is intensified. Figures 23 to 26 It can be seen that when 4.06 ≤ d1m / EP12 ≤ 7.0, the defocus curve of the optical lens is normal, and the imaging performance is stable. Among them, Figures 23 to 26 In the formula, the theoretical limit is the curve of the diffraction limit in the theoretical state, the field 4 is the curve under the 1F field, that is, the modulation curve formed by the light of the full field, wherein F can be understood as the maximum field angle or the full field. The field 3 is the curve under the 0.55F field, that is, the modulation curve formed by the light of 0.55 times the full field. The field 2 is the curve under the 0.33F field, that is, the modulation curve formed by the light of 0.33 times the full field. The field 1 is the curve under the 0F field, that is, the modulation curve formed by the light of the center field.

[0062]

[0063]

[0064] Table 1

[0065] It should be noted that the present application limits d1m / EP126 to a reasonable range, restricts the size of the first spacing element and the spacing distance between the first spacing element and the second spacing element, to ensure the edge light deflection angle, reduce the occurrence of scattering or defocusing, ensure the stability of the imaging performance of the optical lens, solve the problem of the edge field of view dispersion intensifying when L / ∑AT is in the range of 2.53 to 3.12, f2 / T12 is in the range of -19.89 to -16.02, when d1m / EP12 meets the above range, the edge field of view dispersion of the optical lens can be improved, and it is not dependent on the optical power and surface shape of other lenses, and the optical power and surface shape of other lenses are further optimization of the optical lens on this basis. The other lenses can be positive or negative according to the actual design requirements of the optical system, and the surface shape of the other lenses can be convex or concave according to the design requirements of the optical system. The optical system meets: 2.53≤L / ∑AT≤3.12; -19.89≤f2 / T12≤-16.02; 4.06≤d1m / EP12≤7.0, which can have good relative luminance performance.

[0066] For example, in some optional embodiments, the first lens has positive focal power and can converge light rays so as to deflect large-angle light rays towards the optical axis, so as to further increase the light intensity of the edge light rays. For another example, in some optional embodiments, the second lens has negative focal power and can balance the aberration caused by the first lens, so as to further improve the imaging quality. For another example, in some optional embodiments, the third lens has positive focal power and can appropriately converge light rays, so as to smoothly transition the light rays to the rear. For another example, in some optional embodiments, the fourth lens has negative focal power and can balance the aberration caused by the front lens, so as to improve the imaging quality and appropriately diverge the light rays, so as to smoothly transition the light rays to the rear optical system. For another example, in some optional embodiments, the fifth lens has positive focal power and can appropriately converge light rays, so as to avoid serious light ray diffusion and mismatch with the chip. For another example, in some optional embodiments, the seventh lens has negative focal power and can balance the aberration caused by the front positive lens, so as to improve the imaging quality and appropriately diverge the light rays, so as to smoothly transition the light rays to the imaging surface. For another example, in some optional embodiments, the object side of the first lens is convex, the image side of the first lens is concave, the object side of the second lens is concave, the image side of the second lens is convex, the object side of the third lens is convex, the object side of the fourth lens is concave, the object side of the fifth lens is convex, the image side of the fifth lens is convex, the object side of the sixth lens is concave, the image side of the sixth lens is convex, the image side of the seventh lens is concave, and the object side of the eighth lens is concave. By reasonably constraining the surface shape of each lens, the light ray trend can be reasonably constrained, the smooth transition of the light rays can be ensured, and the aberration can be corrected. The optical lens can be simulated by, for example, ZEMAX, CODEV, and / or the like. Preferably, the optical lens can be simulated by CODEV. In the process of simulation by, for example, the above-mentioned software and / or tools, the surface shape of each lens can be simulated according to the surface shape provided by the software and / or tools used and appropriately adjusted.

[0067] wherein ∑AT=T12+T23+T34+T45+T56+T67+T78, wherein T12 is the center thickness of the first lens and the second lens on the optical axis, T23 is the center thickness of the second lens and the third lens on the optical axis, T34 is the center thickness of the third lens and the fourth lens on the optical axis, T45 is the center thickness of the fourth lens and the fifth lens on the optical axis, T56 is the center thickness of the fifth lens and the sixth lens on the optical axis, T67 is the center thickness of the sixth lens and the seventh lens on the optical axis, and T78 is the center thickness of the seventh lens and the eighth lens on the optical axis.

[0068] In some optional embodiments, the following relationship is established among the inner diameter d1s of the object-side surface of the first spacer element, the outer diameter D1m of the image-side surface of the first spacer element, the inner diameter d2s of the object-side surface of the second spacer element, and the outer diameter D2m of the image-side surface of the second spacer element: 0.87≤(D2m-d2s) / (D1m-d1s)≤2.31. By restricting (D2m-d2s) / (D1m-d1s) within a reasonable range, the light flux of the imaging system can be effectively balanced, the excessive stray light can be intercepted, and the inner and outer diameters of the first and second spacer elements can be reasonably designed, so that the effective transmission of the imaging light can be maintained while the stray light is blocked, and stable imaging quality can be ensured under various lighting conditions.

[0069] In some optional embodiments, the following relationship is established between the inner diameter d0m of the image-side end surface of the lens barrel and the effective focal length f8 of the eighth lens: -1.40≤d0m / f8≤0.07. By controlling the proportional relationship between the inner diameter of the image-side end surface of the lens barrel and the effective focal length of the eighth lens within a reasonable range, the effective focal length of the eighth lens can be matched with the inner diameter of the image-side end surface of the lens barrel, so that the light can be accurately focused, and the imaging effect of the imaging system can be optimized while the focal length accuracy is maintained.

[0070] In some optional embodiments, the following relationship is established among the inner diameter d1s of the object-side surface of the first spacer element, the outer diameter D0s of the object-side end surface of the lens barrel, and the inner diameter d0s of the object-side end surface of the lens barrel: 1.43≤d1s / (D0s-d0s)≤3.68. By restricting d1s / (D0s-d0s) within a reasonable range, the light can smoothly enter the lens group, the range of light entering the lens group can be controlled, the collimation of the light beam can be optimized, the transmission of the light beam in the imaging system can be ensured without excessive deflection or scattering, and the accurate positioning of the optical elements during assembly can be ensured, thereby reducing errors in the imaging system and improving the overall mechanical stability of the optical lens.

[0071] In some optional embodiments, the spacer element group further includes a fifth spacer element located between the fifth lens and the sixth lens and in partial contact with the image-side surface of the fifth lens, and the following relationship is established between the outer diameter D5s of the object-side surface of the fifth spacer element and the curvature radius R10 of the image-side surface of the fifth lens: -2.97≤D5s / R10≤-1.21. By restricting D5s / R10 within a reasonable range, the deflection angle of the light at the image-side surface of the fifth lens can be controlled, the light can be prevented from being deflected at a large angle at the image-side surface of the fifth lens, and unnecessary astigmatism caused by the excessively large deflection angle can be reduced, thereby facilitating the improvement of the imaging quality.

[0072] In some optional embodiments, the set of spacer elements further comprises a second spacer element and a third spacer element, the second spacer element is located between the second lens and the third lens and contacts the image-side surface portion of the second lens, the third spacer element is located between the third lens and the fourth lens and contacts the image-side surface portion of the third lens, a separation distance EP23 between the image-side surface of the second spacer element and the object-side surface of the third spacer element in the optical axis direction, an effective focal length f3 of the third lens, and a central thickness CT3 of the third lens in the optical axis direction satisfy: 1.97≤f3 / (EP23+CT3)≤2.99. By constraining f3 / (EP23+CT3) in a reasonable range, the propagation path of the marginal field light can be effectively adjusted, thereby reducing the deviation of the focal position, and further making the defocus curve smoother, while the fine design of EP23 can reduce the light scattering caused by the marginal effect, and further reasonably allocate the sensitivity of the entire imaging system. By reducing the change of the edge thickness leading to unstable propagation path, it is beneficial to improve the stability of the propagation path of the marginal light, thereby improving the overall optical performance of the imaging system and reducing the dispersion of the defocus curve.

[0073] In some optional embodiments, the set of spacer elements further comprises a second spacer element and a third spacer element, the second spacer element is located between the second lens and the third lens and contacts the image-side surface portion of the second lens, the third spacer element is located between the third lens and the fourth lens and contacts the image-side surface portion of the third lens, a separation distance EP23 between the image-side surface of the second spacer element and the object-side surface of the third spacer element in the optical axis direction, an outer diameter D3s of the object-side surface of the third spacer element, and an inner diameter d3s of the object-side surface of the third spacer element satisfy: 1.62≤(D3s-d3s) / EP23≤4.92. By constraining (D3s-d3s) / EP23 in a reasonable range, the excess light can be effectively intercepted, the excessive diffusion of the light during transmission is prevented, the increase of astigmatism is prevented, the uniform propagation of the light is maintained, and the imaging error caused by the excessively wide or narrow propagation channel of the light beam is avoided.

[0074] In some optional embodiments, the set of spacer elements further comprises a third spacer element and a fourth spacer element, the third spacer element is located between the third lens and the fourth lens and contacts the image-side surface portion of the third lens, the fourth spacer element is located between the fourth lens and the fifth lens and contacts the image-side surface portion of the fourth lens, and a separation distance EP34 between the image-side surface of the third spacer element and the object-side surface of the fourth spacer element in the optical axis direction and an effective focal length f4 of the fourth lens satisfy: -7.68≤f4 / EP34≤-4.90. By restricting f4 / EP34 within a reasonable range, the focusing ability of the fourth lens and the relative relationship between the separation distance between the image-side surface of the third spacer element and the object-side surface of the fourth spacer element in the optical axis direction are controlled, so that the light rays can be effectively focused when passing through the fourth lens, the imaging problems such as spherical aberration and astigmatism caused by uneven refraction during light propagation are reduced, the focusing effect of the light beam is optimized while the compactness of the imaging system is maintained, the optical imaging quality is improved, and the dispersion of the defocus curve is reduced.

[0075] In some optional embodiments, the set of spacer elements further comprises a third spacer element and a fourth spacer element, the third spacer element is located between the third lens and the fourth lens and contacts the image-side surface portion of the third lens, the fourth spacer element is located between the fourth lens and the fifth lens and contacts the image-side surface portion of the fourth lens, and a separation distance EP34 between the image-side surface of the third spacer element and the object-side surface of the fourth spacer element in the optical axis direction and a sum ∑EP of the separation distances between the object-side end surface of the lens barrel and any two adjacent optical elements in the set of spacer elements in the optical axis direction satisfy: 4.86≤∑EP / EP34≤5.66. By restricting ∑EP / EP34 within a reasonable range, it is beneficial to control the distribution of the separation distances between the spacer elements, reduce the relative position errors between the spacer elements, ensure the stability of the optical path, reduce the fluctuations of the optical performance caused by tolerances, and ensure the stability of the optical imaging quality.

[0076] Wherein, ∑EP=EP01+EP12+EP23+EP34+EP45+EP56+EP67+EP78, wherein, EP01 is the interval distance between the object side surface of the lens barrel and the object side surface of the first spacer element in the optical axis direction, EP12 is the interval distance between the image side surface of the first spacer element and the object side surface of the second spacer element in the optical axis direction, EP23 is the interval distance between the image side surface of the second spacer element and the object side surface of the third spacer element in the optical axis direction, EP34 is the interval distance between the image side surface of the third spacer element and the object side surface of the fourth spacer element in the optical axis direction, EP45 is the interval distance between the image side surface of the fourth spacer element and the object side surface of the fifth spacer element in the optical axis direction, EP56 is the interval distance between the image side surface of the fifth spacer element and the object side surface of the sixth spacer element in the optical axis direction, EP67 is the interval distance between the image side surface of the sixth spacer element and the object side surface of the seventh spacer element in the optical axis direction, and EP78 is the interval distance between the image side surface of the seventh spacer element and the object side surface of the eighth spacer element in the optical axis direction.

[0077] In some optional embodiments, the spacer element group further comprises a fourth spacer element and a fifth spacer element, the fourth spacer element is located between the fourth lens and the fifth lens and partially contacts the image side surface of the fourth lens, the fifth spacer element is located between the fifth lens and the sixth lens and partially contacts the image side surface of the fifth lens, and the interval distance EP45 between the image side surface of the fourth spacer element and the object side surface of the fifth spacer element in the optical axis direction, the center thickness CT5 of the fifth lens in the optical axis, and the thickness CP5 of the fifth spacer element in the optical axis direction satisfy: 1.10≤CT5 / (EP45+CP5)≤3.37. By constraining CT5 / (EP45+CP5) in a reasonable range, the position and thickness of the fifth lens in the imaging system are more adapted to facilitate the control of spherical aberration and astigmatism, while the smooth transition of light rays in the fifth lens can reduce the deviation of different light ray focusing positions and ensure better imaging quality.

[0078] In some optional embodiments, the set of spacer elements further comprises a fourth spacer element and a fifth spacer element, the fourth spacer element is located between the fourth lens and the fifth lens and in contact with the image-side surface portion of the fourth lens, the fifth spacer element is located between the fifth lens and the sixth lens and in contact with the image-side surface portion of the fifth lens, an inner diameter d4m of the image-side surface of the fourth spacer element, an inner diameter d5s of the object-side surface of the fifth spacer element, and an effective focal length f5 of the fifth lens satisfy: 1.78≤(d4m+d5s) / f5≤3.09. By constraining (d4m+d5s) / f5 within a reasonable range, the propagation path and the light range of the light rays passing through the fifth lens can be controlled, so that the light rays can be effectively focused when passing through the fifth lens, and the problems of virtual focus caused by too much divergence or excessive focusing of the light beam can be avoided, while the insufficient light quantity caused by the blocking of the fourth spacer element and the fifth spacer element to the light rays can be avoided, and the stray light can be effectively blocked, thereby ensuring the imaging quality.

[0079] In some optional embodiments, the set of spacer elements further comprises a sixth spacer element, the sixth spacer element is located between the sixth lens and the seventh lens and in contact with the image-side surface portion of the sixth lens, an inner diameter d6s of the object-side surface of the sixth spacer element, a curvature radius R12 of the image-side surface of the sixth lens, and a refractive index N6 of the sixth lens satisfy: -2.86≤d6s / R12≤-0.94. By constraining d6s / R12 within a reasonable range, the refraction angle of the light rays on the image-side surface of the sixth lens can be effectively controlled, so that the light rays are uniformly distributed on the imaging surface after passing through the sixth lens, the reasonable distribution of the light rays on the imaging surface is ensured, the sensitivity of the sixth lens is reduced, and the light range can be constrained, thereby ensuring the light flux emitted from the sixth lens to the rear system.

[0080] In some optional embodiments, the set of spacer elements further comprises a seventh spacer element, the seventh spacer element is located between the seventh lens and the eighth lens and in contact with the image-side surface portion of the seventh lens, an inner diameter d7s of the object-side surface of the seventh spacer element, a curvature radius R13 of the object-side surface of the seventh lens, and a curvature radius R14 of the image-side surface of the seventh lens satisfy: -2.70≤d7s / (R13+R14)≤0.61. By constraining d7s / (R13+R14) within a reasonable range, the degree of deflection of the light rays passing through the seventh lens and the light range passing through the seventh spacer element are controlled, which is beneficial to reduce the light rays with large deflection angle entering the rear imaging system, can reduce the focusing difference after refraction of the light rays, thereby reducing the spherical aberration, and helps to control the refraction and focusing of the light rays in different directions, so that the light rays can be focused on the same plane in the vertical and horizontal directions, the light dispersion is effectively reduced, and the imaging quality is improved.

[0081] In some optional embodiments, the set of spacer elements further comprises a seventh spacer element located between the seventh lens and the eighth lens and in contact with the image-side surface portion of the seventh lens, and a combination focal length f78 of the seventh lens and the eighth lens, an outer diameter D7s of the object-side surface of the seventh spacer element, and an inner diameter d7s of the object-side surface of the seventh spacer element satisfy: -4.45≤f78 / (D7s-d7s)≤-1.55. By restricting f78 / (D7s-d7s) within a reasonable range, the light ray propagation path can be more stable and collimated, preventing the light rays from having a small refraction angle and thus generating a larger beam divergence, generating spherical aberration, thereby improving the luminous flux and response speed of the imaging system.

[0082] In some optional embodiments, the set of spacer elements further comprises a seventh spacer element and an eighth spacer element, the seventh spacer element is located between the seventh lens and the eighth lens and in contact with the image-side surface portion of the seventh lens, the eighth spacer element is located on the image side of the eighth lens and in contact with the image-side surface portion of the eighth lens, and a separation distance EP78 between the image-side surface of the seventh spacer element and the object-side surface of the eighth spacer element, an outer diameter D8s of the object-side surface of the eighth spacer element, and an inner diameter d8s of the object-side surface of the eighth spacer element satisfy: 1.91≤EP78 / (D8s-d8s)≤2.53. By restricting EP78 / (D8s-d8s) within a reasonable range, the path of the light beam passing through this area can be accurately adjusted, preventing the light beam channel from becoming narrow, affecting the collimation of the light beam, causing the light rays to scatter when passing through the eighth spacer element, causing astigmatism; at the same time, it can also ensure that the refraction angle of the light rays remains consistent when passing through the eighth spacer element, avoiding the generation of uneven focal points due to excessive bending or diffusion of the light rays, thereby effectively reducing aberration and maintaining the clarity of the image.

[0083] In another embodiment of the present application, the optical lens comprises a lens barrel, and a lens set and a spacer set assembled in the lens barrel, the lens set is composed of eight lenses, the lens set sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens along the optical axis direction from the object side to the image side, the second lens has a negative refractive power; the spacer set comprises at least a first spacer and a second spacer, the first spacer is located between the first lens and the second lens and in contact with the image side surface portion of the first lens, and the second spacer is located between the second lens and the third lens and in contact with the image side surface portion of the second lens; the maximum height L of the lens barrel, and the sum ∑AT of the air gaps of any two adjacent lenses in the lens set on the optical axis satisfy: 2.53≤L / ∑AT≤3.12; the effective focal length f2 of the second lens, and the air gap T12 of the first lens and the second lens on the optical axis satisfy: -19.89≤f2 / T12≤-16.02; the inner diameter d1s of the object side surface of the first spacer, the outer diameter D0s of the object side end surface of the lens barrel, and the inner diameter d0s of the object side end surface of the lens barrel satisfy: 1.43≤d1s / (D0s-d0s)≤3.68.

[0084] The optical lens of the present application is composed of a lens barrel, eight lenses and at least two spacers. By reasonably setting the optical lens, when the maximum height L of the lens barrel, and the sum ∑AT of the air gaps of any two adjacent lenses in the lens set on the optical axis satisfy: 2.53≤L / ∑AT≤3.12; the effective focal length f2 of the second lens, and the air gap T12 of the first lens and the second lens on the optical axis satisfy: -19.89≤f2 / T12≤-16.02, the overall size and air gap of the optical lens are constrained to ensure the miniaturization of the optical lens. In the design of the miniaturized optical lens, the size control of the optical lens is closely related to the dispersion degree of the defocus curve. Due to the limitation of the lens size and the gap, the edge ray deflection angle of the second lens increases during assembly adjustment, which finally affects the smoothness of the defocus curve. The defocus curve may present a large dispersion, which will cause unstable system imaging performance. At the same time, the second lens will have a large impact on the optical path difference of different fields of view, resulting in edge dispersion. In order to solve this problem, the present application constrains d1s / (D0s-d0s) within a reasonable range, which is conducive to the smooth entry of light into the lens set, controls the range of light entering the lens set, optimizes the collimation of the light beam, ensures that the transmission of the light beam in the imaging system does not occur excessive deflection or scattering, and can ensure that the light beam has an appropriate beam width when passing through the first spacer, avoiding the situation that the edge ray deflection angle is too large and scattering or defocusing occurs.

[0085] Of course, the present embodiment can also include other parameter formulas in the above embodiments, which will not be described here.

[0086] In another embodiment of the present application, the optical lens comprises a lens barrel, and a lens set and a spacer set assembled in the lens barrel, the lens set is composed of eight lenses, the lens set sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens from the object side to the image side along the optical axis, the first lens has positive refractive power, and the second lens has negative refractive power; the spacer set comprises at least a first spacer and a second spacer, the first spacer is located between the first lens and the second lens and in contact with the image side surface of the first lens, and the second spacer is located between the second lens and the third lens and in contact with the image side surface of the second lens; the maximum height L of the lens barrel and the sum ∑AT of air gaps of any two adjacent lenses in the lens set on the optical axis satisfy: 2.53≤L / ∑AT≤3.12; the effective focal length f2 of the second lens and the air gap T12 of the first lens and the second lens on the optical axis satisfy: -19.89≤f2 / T12≤-16.02; the effective focal length f1 of the first lens, the refractive index N1 of the first lens and the inner diameter d1s of the object side surface of the first spacer satisfy: 6.59≤f1*N1 / d1s≤9.01.

[0087] The optical lens of the present application is composed of a lens barrel, eight lenses and at least two spacers. By reasonably setting the optical lens, when the maximum height L of the lens barrel and the sum ∑AT of air gaps of any two adjacent lenses in the lens set on the optical axis satisfy: 2.53≤L / ∑AT≤3.12; the effective focal length f2 of the second lens and the air gap T12 of the first lens and the second lens on the optical axis satisfy: -19.89≤f2 / T12≤-16.02, the overall size and air gap of the optical lens are constrained to ensure the miniaturization of the optical lens. In the design of the miniaturized optical lens, the size control of the optical lens is closely related to the dispersion degree of the defocus curve. Due to the limitation of the lens size and the gap, the deflection angle of the edge light of the second lens increases during assembly adjustment, which finally affects the smoothness of the defocus curve. The defocus curve may present a large dispersion, which will cause unstable system imaging performance. At the same time, the second lens will have a large impact on the optical path difference of different fields of view, resulting in edge dispersion. In order to solve this problem, f1*N1 / d1s is constrained in a reasonable range, which can control the deflection degree of light at the first lens, is conducive to the convergence of edge light, can ensure that the light beam has a proper beam width when passing through the first spacer, avoids the scattering or defocusing of the edge light due to the too large deflection angle of the edge light, and is conducive to improving the imaging performance of the optical lens.

[0088] Of course, the present embodiment can also include other parameter formulas in the above embodiments, which will not be described here.

[0089] Optionally, the above optical lens can further comprise a filter located between the imaging surface and the lens set.

[0090] Optionally, the optical lens described above can further comprise a protective glass for protecting the photosensitive element located on the imaging surface.

[0091] It should be noted that each lens is composed of a central optical effective diameter region and an edge optical structure region, the central optical effective diameter region and the edge structure region are composed, the optical structure region is located at the outer circumferential side of the optical effective diameter region and is arranged in the circumferential direction of the optical effective diameter region. The optical effective diameter region is used for the passing of imaging light, and the optical structure region is not used for the passing of imaging light, and is used for abutting with a lens barrel or an adjacent lens or an adjacent spacing element. The optical structure region is also called a non-effective diameter region.

[0092] The optical 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 a non-spherical mirror surface. The characteristic of the non-spherical lens is that the curvature is continuously changed 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 non-spherical lens has better curvature radius characteristics, has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting the non-spherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality.

[0093] However, those skilled in the art should understand that the number of lenses constituting the optical lens can be changed without departing from the technical solutions claimed by 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 lens is not limited to including eight lenses. If necessary, the optical lens can also include other numbers of lenses.

[0094] Figure 1 The size annotation diagram of one optical lens of the present application is shown, Figure 1 The parameters d1s, d1m, D1m, d2s, D2m, d3s, D3s, d4m, d5s, D5s, d6s, d7s, D7s, d8s, D8s, d0s, d0m, D0s, EP12, EP23, EP34, EP45, CP5, EP78, L, etc. are marked in the figure, so that the meaning of the parameters can be clearly and intuitively understood. In order to facilitate the description of the optical lens and the surface type of the specific lens, these parameters will not be embodied in the figure when the specific embodiments are described later.

[0095] The specific surface type and parameters of the optical lens applicable to the above-described embodiments will be further described below with reference to the accompanying drawings.

[0096] It should be noted that there are three examples of Example 1-1, Example 1-2, and Example 1-3 in the following Example One, three examples of Example 2-1, Example 2-2, and Example 2-3 in Example Two, and three examples of Example 3-1, Example 3-2, and Example 3-3 in Example Three. The curvature radius, center thickness, and other parameters of the first lens to the eighth lens of the optical lens in the three examples in the same example are the same, but the thickness, inner diameter, and outer diameter of the lens barrel, the first spacing element, the second spacing element, and the third spacing element, and the shape of some lenses are different. Or, the main structure for imaging is the same, and the auxiliary structure for imaging is different.

[0097] It should be noted that any of the following Examples One to Three is applicable to all embodiments of the present application.

[0098] Example One

[0099] As shown in Figures 2 to 8 , the optical lens of Example One is described. Figure 2 The structural schematic diagram of the optical lens of Example 1-1 is shown, Figure 3 The structural schematic diagram of the optical lens of Example 1-2 is shown, Figure 4 The structural schematic diagram of the optical lens of Example 1-3 is shown.

[0100] As shown in Figures 2 to 4 , the optical lens includes a lens barrel, eight lenses, and multiple spacing elements, and the lens barrel includes, in order from the object side to the image side, a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a third lens E3, a third spacing element P3, a fourth lens E4, a fourth spacing element P4, a fifth lens E5, a fifth spacing element P5, a sixth lens E6, a sixth spacing element P6, a seventh lens E7, a seventh spacing element P7, an eighth lens E8, and an eighth spacing element P8.

[0101] As shown in Figure 2As shown in FIG. 1, it is a structural schematic diagram of the optical lens of embodiment 1-1. In this example, the object side S1 of the first lens is in contact with the lens barrel part. The object side and the image side of the first spacer element are in partial contact with 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 element are in partial contact with 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 element are in partial contact with 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 element are in partial contact with 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 element are in partial contact with 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 element are in partial contact with 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 element are in partial contact with the image side S14 of the seventh lens and the object side S15 of the eighth lens, respectively. The image side S16 of the eighth lens is in partial contact with the object side of the eighth spacer element.

[0102] As shown in FIG. 2, it is a structural schematic diagram of the optical lens of embodiment 1-2. In this example, the contact and abutment modes of each spacer element are the same as those of embodiment 1-1, and the relevant descriptions in embodiment 1-1 can be referred to, which will not be repeated here. Figure 3

[0103] As shown in FIG. 3, it is a structural schematic diagram of the optical lens of embodiment 1-3. In this example, the contact and abutment modes of each spacer element are the same as those of embodiment 1-1, and the relevant descriptions in embodiment 1-1 can be referred to, which will not be repeated here. Figure 4

[0104] In summary, the structural parameters of the optical lens of embodiment one under embodiment 1-1, embodiment 1-2, and embodiment 1-3 are shown in Table 9.

[0105] ​​In the embodiment one, the first lens has positive refractive power, the object side S1 of the first lens is convex, and the image side S2 of the first lens is concave. The second lens has negative refractive power, the object side S3 of the second lens is concave, and the image side S4 of the second lens is convex. The third lens has positive refractive power, the object side S5 of the third lens is convex, and the image side S6 of the third lens is convex. The fourth lens has negative refractive power, the object side S7 of the fourth lens is concave, and the image side S8 of the fourth lens is concave. The fifth lens has positive refractive power, the object side S9 of the fifth lens is convex, and the image side S10 of the fifth lens is convex. The sixth lens has positive refractive power, the object side S11 of the sixth lens is concave, and the image side S12 of the sixth lens is convex. The seventh lens has negative refractive power, the object side S13 of the seventh lens is convex, and the image side S14 of the seventh lens is concave. The eighth lens has negative refractive power, the object side S15 of the eighth lens is concave, and the image side S16 of the eighth lens is concave. In the table 2, S17, S18 (not shown in the figure) can be the object side and the image side of the filter or the protective glass, S19 (not shown in the figure) is the imaging surface, OBJ (not shown in the figure) is the object distance, and STO (not shown in the figure) is the diaphragm, which is located on the first lens.

[0106] The table 2 shows the basic structure parameter table of the optical lens in the embodiment one, wherein the units of the radius of curvature and the thickness / distance are millimeters mm.

[0107]

[0108] Table 2

[0109] In the embodiment one, the object side and the image side of the first lens E1 to the eighth lens E8 are aspherical surfaces, and the surface type of each aspherical lens can be defined by using but not limited to the following aspherical formula:

[0110]

[0111] wherein x is the distance from the vertex of the aspherical surface when the aspherical surface is at a height of h along the optical axis direction, h is the height of the aspherical surface, c is the paraxial curvature of the aspherical surface, c = 1 / R, that is, the paraxial curvature c is the reciprocal of the radius of curvature R in the above table 1, k is the conic coefficient, and Ai is the correction coefficient of the i-th order of the aspherical surface. The higher order coefficient A4, A6, A8, A10, A12, A14, A16, A18, A20 of each aspherical surface S1-S16 in the embodiment one is shown in the following table 3.

[0112]

[0113]

[0114] Table 3

[0115] Figure 5 A lateral chromatic aberration curve of the optical lens of embodiment one is shown, which represents the deviation of different image heights of light rays passing through the lens on the imaging plane. Figure 6 An on-axis chromatic aberration curve of the optical lens of embodiment one is shown, which represents the convergence point deviation of light rays of different wavelengths passing through the optical lens. Figure 7 A distortion curve of the optical lens of embodiment one is shown, which represents the distortion size values corresponding to different image heights. Figure 8 A distortion curve of the optical lens of embodiment one is shown, which represents the distortion size values corresponding to different image heights.

[0116] Embodiment two

[0117] As shown in Figures 9 to 15 , the optical lens of embodiment two is described. Figure 9 A structural schematic diagram of the optical lens of embodiment 2-1 is shown, Figure 10 A structural schematic diagram of the optical lens of embodiment 2-2 is shown, Figure 11 A structural schematic diagram of the optical lens of embodiment 2-3 is shown.

[0118] As shown in Figures 9 to 11 , the optical lens includes a lens barrel, eight lenses, and a plurality of spacer elements, the lens barrel includes, in order from the object side to the image side, a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fifth lens E5, a fifth spacer element P5, a sixth lens E6, a sixth spacer element P6, a seventh lens E7, a seventh spacer element P7, an eighth lens E8, and an eighth spacer element P8.

[0119] As shown in Figure 9As shown in FIG. 2-1, it is a structural schematic diagram of the optical lens of Example 2-1. In this example, the object side S1 of the first lens is in contact with the lens barrel part. The object side and the image side of the first spacer element are in partial contact with 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 element are in partial contact with 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 element are in partial contact with 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 element are in partial contact with 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 element are in partial contact with 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 element are in partial contact with 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 element are in partial contact with the image side S14 of the seventh lens and the object side S15 of the eighth lens, respectively. The image side S16 of the eighth lens is in partial contact with the object side of the eighth spacer element.

[0120] As shown in FIG. 2-2, it is a structural schematic diagram of the optical lens of Example 2-2. In this example, the abutting contact mode of each spacer element is the same as that of Example 2-1, and the relevant description in Example 2-1 can be referred to, which will not be repeated here. Figure 10

[0121] As shown in FIG. 2-3, it is a structural schematic diagram of the optical lens of Example 2-3. In this example, the abutting contact mode of each spacer element is the same as that of Example 2-1, and the relevant description in Example 2-1 can be referred to, which will not be repeated here. Figure 11

[0122] In summary, the structural parameters of the optical lens of Example 2 under Example 2-1, Example 2-2, and Example 2-3 are shown in Table 9.

[0123] ​​In embodiment two, the first lens has positive refractive power, the object side S1 of the first lens is convex, and the image side S2 of the first lens is concave. The second lens has negative refractive power, the object side S3 of the second lens is concave, and the image side S4 of the second lens is convex. The third lens has positive refractive power, the object side S5 of the third lens is convex, and the image side S6 of the third lens is concave. The fourth lens has negative refractive power, the object side S7 of the fourth lens is concave, and the image side S8 of the fourth lens is concave. The fifth lens has positive refractive power, the object side S9 of the fifth lens is convex, and the image side S10 of the fifth lens is convex. The sixth lens has positive refractive power, the object side S11 of the sixth lens is concave, and the image side S12 of the sixth lens is convex. The seventh lens has negative refractive power, the object side S13 of the seventh lens is concave, and the image side S14 of the seventh lens is concave. The eighth lens has negative refractive power, the object side S15 of the eighth lens is concave, and the image side S16 of the eighth lens is concave. In Table 4, S17, S18 (not shown in the figure) can be the object side and the image side of the filter or the protective glass, S19 (not shown in the figure) is the imaging surface, OBJ (not shown in the figure) is the object distance, and STO (not shown in the figure) is the stop, which is located on the first lens.

[0124] Table 4 shows the basic structure parameter table of the optical lens of embodiment two, wherein the units of the radius of curvature, the thickness / distance are all millimeters mm.

[0125]

[0126]

[0127] Table 4

[0128] Table 5 shows the basic structure parameter table of the optical lens of embodiment two, wherein the units of the radius of curvature, the thickness / distance are all millimeters mm.

[0129] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -5.3048E-04 -5.9223E-03 6.0861E-03 -4.4147E-03 1.9471E-03 -5.3656E-04 8.8975E-05 -8.0101E-06 2.9891E-07 S2 -9.7284E-04 -4.0446E-03 2.6279E-03 -1.8742E-03 8.8521E-04 -2.8914E-04 6.0410E-05 -6.8984E-06 3.2181E-07 S3 1.2235E-01 -8.4085E-02 5.5358E-02 -2.6536E-02 8.8117E-03 -1.9656E-03 2.8330E-04 -2.4053E-05 9.1974E-07 S4 9.3785E-02 -6.2877E-02 3.9439E-02 -1.7081E-02 4.8143E-03 -8.2735E-04 7.6980E-05 -2.8059E-06 -1.9159E-08 S5 -2.5568E-02 3.7803E-03 1.1931E-03 -1.4914E-03 5.9094E-04 -1.2321E-04 1.4346E-05 -8.7484E-07 2.1490E-08 S6 -4.3429E-02 1.5141E-02 2.2665E-03 -5.0024E-03 2.2658E-03 -5.2692E-04 6.8679E-05 -4.7596E-06 1.3668E-07 S7 1.0105E-02 -8.5968E-03 1.3112E-02 -9.2470E-03 3.5085E-03 -7.7488E-04 9.9565E-05 -6.8988E-06 1.9944E-07 S8 4.0904E-02 -1.6452E-02 3.7738E-03 -2.3226E-04 -1.5892E-04 5.6050E-05 -8.6306E-06 6.6800E-07 -2.0956E-08 S9 3.1273E-03 -1.4292E-03 3.2551E-04 -3.3396E-06 -6.7427E-06 -9.5057E-07 5.2932E-07 -6.1198E-08 2.2825E-09 S10 5.1522E-03 -3.6498E-03 2.1463E-03 -1.0646E-03 3.5044E-04 -7.1374E-05 8.5455E-06 -5.4588E-07 1.4288E-08 S11 3.1364E-02 -6.9285E-03 -1.2474E-03 1.0385E-03 -3.1511E-04 5.7871E-05 -6.4647E-06 3.9788E-07 -1.0255E-08 S12 4.0170E-02 -8.7756E-03 -1.1598E-03 1.0801E-03 -2.9908E-04 4.8195E-05 -4.6107E-06 2.3764E-07 -5.0410E-09 S13 -2.4685E-02 1.8259E-02 -1.0704E-02 3.0768E-03 -4.5945E-04 3.3327E-05 -5.5343E-07 -6.1760E-08 2.6157E-09 S14 -1.0870E-01 5.9348E-02 -1.8078E-02 3.3966E-03 -4.0874E-04 3.1306E-05 -1.4643E-06 3.7880E-08 -4.1284E-10 S15 -8.5717E-02 4.8930E-02 -1.3782E-02 2.2669E-03 -2.3169E-04 1.4978E-05 -5.9778E-07 1.3438E-08 -1.2938E-10 S16 -5.5517E-03 2.1159E-03 -1.1064E-03 2.7035E-04 -3.8641E-05 3.4457E-06 -1.8655E-07 5.5604E-09 -6.9608E-11

[0130] Table 5

[0131] Figure 12 The relative aperture curve of the optical lens of embodiment two is shown, which represents the deviation of the different image heights of the light rays after passing through the lens. Figure 13 The axial chromatic aberration curve of the optical lens of embodiment two is shown, which represents the deviation of the converging points of the light rays of different wavelengths after passing through the optical lens. Figure 14 The astigmatism curve of the optical lens of embodiment two is shown, which represents the meridional image surface curvature and the sagittal image surface curvature. Figure 15 The distortion curve of the optical lens of embodiment two is shown, which represents the distortion size values corresponding to different image heights.

[0132] Embodiment Three

[0133] As shown in FIG. 3, an optical lens of embodiment three is described. Figures 16 to 22 Figure 16 A structural schematic diagram of the optical lens of embodiment 3-1 is shown in FIG. 3-1. Figure 17 A structural schematic diagram of the optical lens of embodiment 3-2 is shown in FIG. 3-2. Figure 18 A structural schematic diagram of the optical lens of embodiment 3-3 is shown in FIG. 3-3.

[0134] As shown in FIG. 3, an optical lens of embodiment three is described. Figures 16 to 18 The optical lens includes a lens barrel, eight lenses, and multiple spacer elements. The lens barrel includes, in order from the object side to the image side, a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fifth lens E5, a fifth spacer element P5, a sixth lens E6, a sixth spacer element P6, a seventh lens E7, a seventh spacer element P7, an eighth lens E8, and an eighth spacer element P8.

[0135] As shown in FIG. 3-1, a structural schematic diagram of the optical lens of embodiment 3-1 is shown. In this example, the object side surface S1 of the first lens is in partial contact with the lens barrel. The object side surface and the image side surface of the first spacer element are in partial contact with 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 element are in partial contact with 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 element are in partial contact with 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 element are in partial contact with 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 element are in partial contact with 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 element are in partial contact with 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 element are in partial contact with the image side surface S14 of the seventh lens and the object side surface S15 of the eighth lens, respectively. The image side surface S16 of the eighth lens is in partial contact with the object side surface of the eighth spacer element. Figure 16 As shown in FIG. 3-2, a structural schematic diagram of the optical lens of embodiment 3-2 is shown. In this example, the abutting contact modes of the spacer elements are the same as those of embodiment 3-1, and the relevant descriptions in embodiment 3-1 can be referred to, which will not be repeated here.

[0136] Figure 17 As shown in FIG. 3-3, a structural schematic diagram of the optical lens of embodiment 3-3 is shown. In this example, the abutting contact modes of the spacer elements are the same as those of embodiment 3-1, and the relevant descriptions in embodiment 3-1 can be referred to, which will not be repeated here.

[0137] As shown in FIG. 3-3, a structural schematic diagram of the optical lens of embodiment 3-3 is shown. In this example, the abutting contact modes of the spacer elements are the same as those of embodiment 3-1, and the relevant descriptions in embodiment 3-1 can be referred to, which will not be repeated here. Figure 18 ​​Fig. 3-3 shows a structural schematic diagram of the optical lens of Example 3-3. In this example, the abutting mode of each spacer element is the same as that of Example 3-1, and the relevant description in Example 3-1 can be referred to, which will not be repeated here.

[0138] In summary, the structural parameters of the optical lens of Example Three under Examples 3-1, 3-2 and 3-3 are shown in Table 9.

[0139] In Example Three, the first lens has positive refractive power, the object side S1 of the first lens is convex, and the image side S2 of the first lens is concave. The second lens has negative refractive power, the object side S3 of the second lens is concave, and the image side S4 of the second lens is convex. The third lens has positive refractive power, the object side S5 of the third lens is convex, and the image side S6 of the third lens is convex. The fourth lens has negative refractive power, the object side S7 of the fourth lens is concave, and the image side S8 of the fourth lens is convex. The fifth lens has positive refractive power, the object side S9 of the fifth lens is convex, and the image side S10 of the fifth lens is convex. The sixth lens has negative refractive power, the object side S11 of the sixth lens is concave, and the image side S12 of the sixth lens is convex. The seventh lens has negative refractive power, the object side S13 of the seventh lens is concave, and the image side S14 of the seventh lens is concave. The eighth lens has positive refractive power, the object side S15 of the eighth lens is concave, and the image side S16 of the eighth lens is convex. Among them, S17, S18 (not shown in the figure) in Table 6 can be the object side and image side of the filter or protective glass, S19 (not shown in the figure) is the imaging surface, OBJ (not shown in the figure) is the object distance, STO (not shown in the figure) is the stop, and the stop is located on the first lens.

[0140] Table 6 shows the basic structural parameter table of the optical lens of Example Three, wherein the units of the curvature radius, thickness / distance are all millimeters mm.

[0141]

[0142]

[0143] Table 6

[0144] Table 7 shows the basic structural parameter table of the optical lens of Example Three, wherein the units of the curvature radius, thickness / distance are all millimeters mm.

[0145] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -1.1863E-03 -2.7510E-03 2.8417E-03 -2.3552E-03 1.1322E-03 -3.3229E-04 5.7807E-05 -5.4057E-06 2.0845E-07 S2 -2.6771E-04 -3.3699E-03 3.0286E-03 -2.7226E-03 1.4589E-03 -4.8796E-04 9.8167E-05 -1.0674E-05 4.7847E-07 S3 8.2314E-02 -5.3307E-02 3.5402E-02 -1.7679E-02 6.1465E-03 -1.4366E-03 2.1667E-04 -1.9160E-05 7.5457E-07 S4 5.0658E-02 -2.8468E-02 1.6943E-02 -6.8652E-03 1.6934E-03 -2.1576E-04 6.1478E-06 1.3602E-06 -1.0322E-07 S5 -2.8281E-02 1.1030E-02 -4.4832E-03 1.3258E-03 -2.7814E-04 4.0091E-05 -3.7604E-06 2.0658E-07 -5.0451E-09 S6 -2.7162E-02 6.9514E-03 3.5643E-06 -6.9346E-04 2.4443E-04 -4.3901E-05 4.5807E-06 -2.6401E-07 6.5082E-09 S7 6.3869E-02 -3.9257E-02 1.8175E-02 -5.8855E-03 1.3030E-03 -1.9433E-04 1.8721E-05 -1.0496E-06 2.5878E-08 S8 8.6202E-02 -4.2214E-02 1.4386E-02 -3.4000E-03 5.4387E-04 -5.7187E-05 3.7181E-06 -1.3137E-07 1.8217E-09 S9 1.8911E-03 -5.7128E-04 -8.2283E-04 6.3383E-04 -2.0152E-04 3.5603E-05 -3.6191E-06 1.9710E-07 -4.4439E-09 S10 3.8727E-02 -2.1420E-02 6.6241E-03 -1.0455E-03 5.4062E-05 6.7962E-06 -1.1890E-06 6.6210E-08 -1.3002E-09 S11 1.4022E-01 -7.9981E-02 2.9964E-02 -7.2876E-03 1.1805E-03 -1.2924E-04 9.2249E-06 -3.8425E-07 7.0018E-09 S12 1.0755E-01 -4.9024E-02 1.4747E-02 -2.8920E-03 3.7553E-04 -3.2390E-05 1.7993E-06 -5.8535E-08 8.4756E-10 S13 -3.7824E-02 3.8021E-02 -1.6541E-02 3.7453E-03 -4.9966E-04 4.1150E-05 -2.0676E-06 5.8274E-08 -7.0707E-10 S14 -1.5038E-01 9.8917E-02 -3.5286E-02 7.4730E-03 -9.8959E-04 8.2886E-05 -4.2668E-06 1.2314E-07 -1.5241E-09 S15 -9.4348E-02 5.3389E-02 -1.7879E-02 3.7552E-03 -4.9981E-04 4.1943E-05 -2.1463E-06 6.1081E-08 -7.4036E-10 S16 3.3392E-02 -1.6414E-02 3.9500E-03 -5.8732E-04 5.6817E-05 -3.5825E-06 1.4195E-07 -3.2043E-09 3.1364E-11

[0146] Table 7

[0147] Figure 19 Fig. 3-4 shows the relative color aberration curve of the optical lens of Example Three, which represents the deviation of different image heights of light rays after passing through the lens on the imaging surface.Figure 20 An axial chromatic aberration curve of the optical lens according to Embodiment Three is shown, which represents the convergence point deviation of light rays of different wavelengths after passing through the optical lens. Figure 21 A distortion curve of the optical lens according to Embodiment Three is shown, which represents the distortion size values corresponding to different image heights. Figure 22 A distortion curve of the optical lens according to Embodiment Three is shown, which represents the distortion size values corresponding to different image heights.

[0148] In summary, the optical lenses according to Embodiments One to Three respectively satisfy the relationships shown in Table 8.

[0149] Conditional expression / Embodiment 1-1 1-2 1-3 2-1 2-2 2-3 3-1 3-2 3-3 L / ∑AT 2.75 2.75 2.76 2.53 2.54 2.54 3.12 3.11 3.11 f2 / T12 -19.89 -19.89 -19.89 -19.31 -19.31 -19.31 -16.02 -16.02 -16.02 d1m / EP12 4.07 4.06 4.34 5.82 7.00 6.68 4.42 4.64 4.37 (D2m-d2s) / (D1m-d1s) 2.22 2.11 2.31 1.25 1.24 1.22 0.89 0.93 0.87 CT5 / (EP45+CP5) 1.12 1.14 1.10 1.34 1.34 1.29 3.37 3.37 3.15 d7s / (R13+R14) 0.31 0.31 0.31 0.61 0.61 0.61 -2.69 -2.70 -2.69 d0m / f8 -1.28 -1.28 -1.30 -1.38 -1.39 -1.40 0.07 0.07 0.07 f4 / EP34 -4.90 -4.90 -4.90 -7.68 -7.41 -7.48 -5.93 -5.85 -6.30 (d4m+d5s) / f5 1.79 1.80 1.82 1.78 1.79 1.80 3.09 3.09 3.09 d1s / (D0s-d0s) 2.90 2.90 2.90 2.31 2.31 2.31 3.68 1.43 2.45 f3 / (EP23+CT3) 2.50 2.50 2.43 2.99 2.85 2.95 2.02 2.02 1.97 EP78 / (D8s-d8s) 2.21 2.53 1.91 2.24 2.33 2.16 2.31 2.13 2.35 ∑EP / EP34 4.95 4.95 4.95 5.66 5.47 5.52 4.90 4.86 5.26 D5s / R10 -1.21 -1.22 -1.24 -1.22 -1.23 -1.24 -2.40 -2.94 -2.97 d6s / R12 -0.94 -0.95 -0.94 -1.97 -1.97 -1.96 -2.86 -2.86 -2.84 (D3s-d3s) / EP23 1.75 4.92 4.77 2.14 2.00 2.31 1.62 1.81 1.75 f78 / (D7s-d7s) -4.45 -4.32 -3.89 -1.63 -1.61 -1.55 -2.38 -2.28 -2.21 f1*N1 / d1s 8.99 9.01 9.01 6.59 6.61 6.61 7.34 7.36 7.36

[0150] Table 8

[0151] Table 9 shows some parameters (in mm, and the unit of FOV is °) of the optical lenses according to Embodiments One to Three.

[0152]

[0153]

[0154] Table 9

[0155] 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 on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical lens described above.

[0156] Obviously, the above-described embodiments are only some, but not all, of the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts should fall within the scope of the present application.

[0157] It is apparent that the above-described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts should fall within the scope of the present application.

[0158] It should be noted that the terms "first", "second", and the like, used in the description and in the claims of the present application as well as above-mentioned figures are used to distinguish between similar objects and not necessarily for describing a specific sequential or chronological order. It is to be understood that the use of data so designated is not meant to limit a given item described by such data to the same category as other data designated by the same designations, but instead is so designated only for convenience as a means of discriminating between the two series of items that refer to a same data.

[0159] The preferred embodiments of the application described above are intended to be illustrative only and in no way limit the scope of the present application. Various modifications made to the preferred embodiments of the application in addition to those described above may be undertaken by those skilled in the art without departing from the spirit and scope of the application described and claimed herein.

Claims

1. An optical lens characterized in that, A lens barrel including a lens group and a spacer element group assembled in the lens barrel, The lens group is composed of eight lenses, and the lens group includes, in order from an object side to an image side along an optical axis direction, 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, and the second lens has a negative refractive power; The spacer element group includes at least a first spacer element and a second spacer element, the first spacer element is located between the first lens and the second lens and contacts an image side surface portion of the first lens, and the second spacer element is located between the second lens and the third lens and contacts an image side surface portion of the second lens; A maximum height L of the lens barrel, and a total sum ∑AT of air intervals of any two adjacent lenses in the lens group on the optical axis satisfy: 2.53≤L / ∑AT≤3.12; An effective focal length f2 of the second lens, and an air interval T12 of the first lens and the second lens on the optical axis satisfy: -19.89≤f2 / T12≤-16.02; An inner diameter d1m of an image side surface of the first spacer element, and a separation distance EP12 of the image side surface of the first spacer element and an object side surface of the second spacer element in the optical axis direction satisfy: 4.06≤d1m / EP12≤7.

0.

2. The optical lens of claim 1, wherein, An inner diameter d1s of an object side surface of the first spacer element, an outer diameter D1m of the image side surface of the first spacer element, an inner diameter d2s of an object side surface of the second spacer element, and an outer diameter D2m of the image side surface of the second spacer element satisfy: 0.87≤(D2m-d2s) / (D1m-d1s)≤2.

31.

3. The optical lens of claim 1, wherein, An inner diameter d0m of an image side end surface of the lens barrel, and an effective focal length f8 of the eighth lens satisfy: -1.40≤d0m / f8≤0.

07.

4. The optical lens of claim 1, wherein, An inner diameter d1s of an object side surface of the first spacer element, an outer diameter D0s of an object side end surface of the lens barrel, and an inner diameter d0s of the object side end surface of the lens barrel satisfy: 1.43≤d1s / (D0s-d0s)≤3.

68.

5. The optical lens of claim 1, wherein, An image side surface of the fifth lens is a convex surface, the spacer element group further includes a fifth spacer element, the fifth spacer element is located between the fifth lens and the sixth lens and contacts an image side surface portion of the fifth lens, and an outer diameter D5s of an object side surface of the fifth spacer element and a curvature radius R10 of the image side surface of the fifth lens satisfy: -2.97≤D5s / R10≤-1.

21.

6. The optical lens of claim 1, wherein, The third lens has positive refractive power, the spacer element group further includes a second spacer element and a third spacer element, the second spacer element is located between the second lens and the third lens and contacts an image side surface portion of the second lens, the third spacer element is located between the third lens and the fourth lens and contacts an image side surface portion of the third lens, a separation distance EP23 of an image side surface of the second spacer element and an object side surface of the third spacer element in the optical axis direction, an effective focal length f3 of the third lens, and a central thickness CT3 of the third lens on the optical axis satisfy: 1.97 ≤ f3 / (EP23+CT3) ≤ 2.

99.

7. The optical lens of claim 1, wherein, The spacer element group further includes a second spacer element and a third spacer element, the second spacer element is located between the second lens and the third lens and contacts an image side surface portion of the second lens, the third spacer element is located between the third lens and the fourth lens and contacts an image side surface portion of the third lens, a separation distance EP23 of an image side surface of the second spacer element and an object side surface of the third spacer element in the optical axis direction, an outer diameter D3s of the object side surface of the third spacer element, and an inner diameter d3s of the object side surface of the third spacer element satisfy: 1.62 ≤ (D3s-d3s) / EP23 ≤ 4.

92.

8. The optical lens of claim 1, wherein, The fourth lens has negative refractive power, the spacer element group further includes a third spacer element and a fourth spacer element, the third spacer element is located between the third lens and the fourth lens and contacts an image side surface portion of the third lens, the fourth spacer element is located between the fourth lens and the fifth lens and contacts an image side surface portion of the fourth lens, a separation distance EP34 of an image side surface of the third spacer element and an object side surface of the fourth spacer element in the optical axis direction, and an effective focal length f4 of the fourth lens satisfy: -7.68 ≤ f4 / EP34 ≤ -4.

90.

9. The optical lens of claim 1, wherein, The spacer element group further includes a third spacer element and a fourth spacer element, the third spacer element is located between the third lens and the fourth lens and contacts an image side surface portion of the third lens, the fourth spacer element is located between the fourth lens and the fifth lens and contacts an image side surface portion of the fourth lens, a separation distance EP34 of an image side surface of the third spacer element and an object side surface of the fourth spacer element in the optical axis direction, and a sum ∑EP of separation distances of the object side end surface of the lens barrel and any two adjacent optical elements in the spacer element group on the optical axis satisfy: 4.86 ≤ ∑EP / EP34 ≤ 5.

66.

10. The optical lens of any of claims 1 to 9, wherein, The spacer element group further includes a fourth spacer element and a fifth spacer element, the fourth spacer element is located between the fourth lens and the fifth lens and contacts an image side surface portion of the fourth lens, the fifth spacer element is located between the fifth lens and the sixth lens and contacts an image side surface portion of the fifth lens, a distance EP45 in the optical axis direction between an image side surface of the fourth spacer element and an object side surface of the fifth spacer element, a central thickness CT5 of the fifth lens on the optical axis, and a thickness CP5 of the fifth spacer element in the optical axis direction satisfy: 1.10 ≤ CT5 / (EP45+CP5) ≤ 3.

37.

11. The optical lens of any of claims 1 to 9, wherein, The fifth lens has positive refractive power, the spacer element group further includes a fourth spacer element and a fifth spacer element, the fourth spacer element is located between the fourth lens and the fifth lens and contacts an image side surface portion of the fourth lens, the fifth spacer element is located between the fifth lens and the sixth lens and contacts an image side surface portion of the fifth lens, an inner diameter d4m of an image side surface of the fourth spacer element, an inner diameter d5s of an object side surface of the fifth spacer element, and an effective focal length f5 of the fifth lens satisfy: 1.78 ≤ (d4m+d5s) / f5 ≤ 3.

09.

12. The optical lens of any of claims 1 to 9, wherein, An image side surface of the sixth lens is convex, the spacer element group further includes a sixth spacer element, the sixth spacer element is located between the sixth lens and the seventh lens and contacts an image side surface portion of the sixth lens, an inner diameter d6s of an object side surface of the sixth spacer element, a curvature radius R12 of an image side surface of the sixth lens, and a refractive index N6 of the sixth lens satisfy: -2.86 ≤ d6s / R12 ≤ -0.

94.

13. The optical lens of any of claims 1 to 9, wherein, An image side surface of the seventh lens is concave, the spacer element group further includes a seventh spacer element, the seventh spacer element is located between the seventh lens and the eighth lens and contacts an image side surface portion of the seventh lens, an inner diameter d7s of an object side surface of the seventh spacer element, a curvature radius R13 of an object side surface of the seventh lens, and a curvature radius R14 of an image side surface of the seventh lens satisfy: -2.70 ≤ d7s / (R13+R14) ≤ 0.

61.

14. The optical lens of any of claims 1 to 9, wherein, The seventh lens has negative refractive power, the spacer element group further includes a seventh spacer element, the seventh spacer element is located between the seventh lens and the eighth lens and contacts an image side surface portion of the seventh lens, 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 element, and an inner diameter d7s of the object side surface of the seventh spacer element satisfy: -4.45 ≤ f78 / (D7s-d7s) ≤ -1.

55.

15. The optical lens of any of claims 1 to 9, wherein, The spacer element group further includes a seventh spacer element and an eighth spacer element. The seventh spacer element is located between the seventh lens and the eighth lens and is in contact with the image-side surface of the seventh lens. The eighth spacer element is located on the image side of the eighth lens and is in contact with the image-side surface of the eighth lens. The spacing distance EP78 between the image-side surface of the seventh spacer element and the object-side surface of the eighth spacer element in the optical axis direction, the outer diameter D8s of the object-side surface of the eighth spacer element, and the inner diameter d8s of the object-side surface of the eighth spacer element satisfy the following: 1.91≤EP78 / (D8s-d8s)≤2.

53.

16. The optical lens of any of claims 1 to 9, wherein, The optical lens satisfies at least one of the following: The first lens has positive optical power, the object side of the first lens is convex, and the image side of the first lens is concave. The object-side surface of the second lens is concave, and the image-side surface of the second lens is convex. The object-side surface of the third lens is convex. The object-side surface of the fourth lens is concave. The object-side surface of the fifth lens is convex. The object-side surface of the sixth lens is concave; The object-side surface of the eighth lens is concave.

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