Optical imaging device

Abstract

The invention provides an optical imaging apparatus. The optical imaging device comprises a lens barrel, a lens group and a spacing element group, and the lens group is composed of eight lenses. A first lens with positive focal power, a second lens with focal power, a third lens with focal power, a fourth lens with negative focal power, a fifth lens with focal power, a sixth lens with focal power, a seventh lens with focal power and an eighth lens with negative focal power are sequentially arranged from the object side to the image side. L / sigma CP is greater than or equal to 5.19 and less than or equal to 10.92; r11 / R12 * V6 is greater than or equal to 13.76 and less than or equal to 15.93; and (EP56 + sigma CP6) / CT6 is greater than or equal to 2.68 and less than or equal to 3.90. According to the invention, the problems of stress concentration and deformation during assembly caused by unreasonable size of the tail-end lens due to the fact that the tail-end lens is selected as a high-dispersion material in an eight-piece optical imaging device in the prior art are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of optical imaging, and more particularly, to an optical imaging device. Background Art

[0002] With the rapid development of technology, consumers have put forward higher requirements for the optical imaging devices equipped on portable intelligent electronic devices, especially those on smartphones. To meet the high-definition camera needs in users' daily life, the number of lens elements in optical imaging devices has been increasing continuously, and in particular, the application of eight-element optical imaging devices is becoming more and more widespread. However, the lightweight design of smartphones limits the volume of optical imaging devices, which poses many challenges in the design and assembly of eight-element optical imaging devices.

[0003] In the design of existing eight-element optical imaging devices, in order to optimize the chromatic aberration correction of the optical imaging device while meeting the requirement of a compact structure, the rear lens is usually made of a high-dispersion material. This limits the structural size of the rear lens and easily causes stress concentration and deformation under pressure during the assembly process, thus affecting the assembly stability of the optical imaging device.

[0004] That is to say, the existing eight-element optical imaging devices have the problem that the rear lens is made of a high-dispersion material, resulting in an unreasonable size of the rear lens, and further causing stress concentration and deformation during assembly. Summary of the Invention

[0005] The main object of the present invention is to provide an optical imaging device to solve the problem in the existing eight-element optical imaging devices that the rear lens is made of a high-dispersion material, resulting in an unreasonable size of the rear lens, and further causing stress concentration and deformation during assembly.

[0006] To achieve the above object, according to one aspect of the present invention, there is provided an optical imaging device, including a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens group is composed of eight lenses. The eight lenses are, in order from the object side to the image side, a first lens with a positive optical power, a second lens with an optical power, a third lens with an optical power, a fourth lens with a negative optical power, a fifth lens with an optical power, a sixth lens with an optical power, a seventh lens with an optical power, and an eighth lens with a negative optical power; the object side surface of the first lens is convex, the image side surface of the fifth lens is convex, the object side surface of the sixth lens is concave, the image side surface of the sixth lens is convex, and the image side surface of the eighth lens is concave; there is an air gap between adjacent two of the first lens to the eighth lens on the optical axis of the optical imaging device; the spacer element group includes a first spacer element disposed between the first lens and the second lens and partially abutting against the image side surface of the first lens, a second spacer element disposed between the second lens and the third lens and partially abutting against the image side surface of the second lens, a third spacer element disposed between the third lens and the fourth lens and partially abutting against the image side surface of the third lens, a fourth spacer element disposed between the fourth lens and the fifth lens and partially abutting against the image side surface of the fourth lens, a fifth spacer element disposed between the fifth lens and the sixth lens and partially abutting against the image side surface of the fifth lens, a sixth spacer element disposed between the sixth lens and the seventh lens and partially abutting against the image side surface of the sixth lens, a seventh spacer element disposed between the seventh lens and the eighth lens and partially abutting against the image side surface of the seventh lens, and an eighth spacer element disposed on the image side of the eighth lens and partially abutting against the image side surface of the eighth lens; the maximum axial height L of the lens barrel and the sum ∑CP of the axial thicknesses of all the spacer elements of the optical imaging device satisfy: 5.19 ≤ L / ∑CP ≤ 10.92; the radius of curvature R11 of the object side surface of the sixth lens, the radius of curvature R12 of the image side surface of the sixth lens and the Abbe number V6 of the sixth lens satisfy: 13.76 ≤ R11 / R12 × V6 ≤ 15.93; the spacer distance EP56 on the optical axis from the image side surface of the fifth spacer element to the object side surface of the sixth spacer element, the sum ∑CP6 of the axial thicknesses of all the spacer elements located between the sixth lens and the seventh lens, and the central thickness CT6 of the sixth lens on the optical axis satisfy: 2.68 ≤ (EP56 + ∑CP6) / CT6 ≤ 3.90.

[0007] According to another aspect of the present invention, there is provided an optical imaging device, including a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens group is composed of eight lenses. The eight lenses are, in order from the object side to the image side, a first lens with a positive optical power, a second lens with an optical power, a third lens with an optical power, a fourth lens with a negative optical power, a fifth lens with an optical power, a sixth lens with an optical power, a seventh lens with an optical power, and an eighth lens with a negative optical power; the object side surface of the first lens is convex, the image side surface of the fifth lens is convex, the object side surface of the sixth lens is concave, the image side surface of the sixth lens is convex, and the image side surface of the eighth lens is concave; there is an air gap on the optical axis of the optical imaging device between adjacent two of the first lens to the eighth lens; the spacer element group includes a first spacer element disposed between the first lens and the second lens and partially abutted against the image side surface of the first lens, a second spacer element disposed between the second lens and the third lens and partially abutted against the image side surface of the second lens, a third spacer element disposed between the third lens and the fourth lens and partially abutted against the image side surface of the third lens, a fourth spacer element disposed between the fourth lens and the fifth lens and partially abutted against the image side surface of the fourth lens, a fifth spacer element disposed between the fifth lens and the sixth lens and partially abutted against the image side surface of the fifth lens, a sixth spacer element disposed between the sixth lens and the seventh lens and partially abutted against the image side surface of the sixth lens, a seventh spacer element disposed between the seventh lens and the eighth lens and partially abutted against the image side surface of the seventh lens, and an eighth spacer element disposed on the image side of the eighth lens and partially abutted against the image side surface of the eighth lens; the maximum axial height L of the lens barrel and the effective focal length f of the optical imaging device satisfy: 1.40 ≤ L / f ≤ 1.53; the radius of curvature R11 of the object side surface of the sixth lens, the radius of curvature R12 of the image side surface of the sixth lens, and the Abbe number V6 of the sixth lens satisfy: 13.76 ≤ R11 / R12 × V6 ≤ 15.93; the sixth lens has a negative optical power, and the effective focal length f6 of the sixth lens, the distance EP56 on the optical axis between the image side surface of the fifth spacer element and the object side surface of the sixth spacer element, and the central thickness CT6 of the sixth lens on the optical axis satisfy: 4.89 ≤ |f6| / (EP56 + CT6) ≤ 8.06.

[0008] According to another aspect of the present invention, there is provided an optical imaging device, including a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens group is composed of eight lenses. The eight lenses are, in order from the object side to the image side, a first lens with a positive optical power, a second lens with an optical power, a third lens with an optical power, a fourth lens with a negative optical power, a fifth lens with an optical power, a sixth lens with an optical power, a seventh lens with an optical power, and an eighth lens with a negative optical power. The object side surface of the first lens is convex, the image side surface of the fifth lens is convex, the object side surface of the sixth lens is concave, the image side surface of the sixth lens is convex, and the image side surface of the eighth lens is concave. There is an air gap on the optical axis between two adjacent lenses among the first lens to the eighth lens. The spacer element group includes a first spacer element disposed between the first lens and the second lens and partially abutting against the image side surface of the first lens, a second spacer element disposed between the second lens and the third lens and partially abutting against the image side surface of the second lens, a third spacer element disposed between the third lens and the fourth lens and partially abutting against the image side surface of the third lens, a fourth spacer element disposed between the fourth lens and the fifth lens and partially abutting against the image side surface of the fourth lens, a fifth spacer element disposed between the fifth lens and the sixth lens and partially abutting against the image side surface of the fifth lens, a sixth spacer element disposed between the sixth lens and the seventh lens and partially abutting against the image side surface of the sixth lens, a seventh spacer element disposed between the seventh lens and the eighth lens and partially abutting against the image side surface of the seventh lens, and an eighth spacer element disposed on the image side of the eighth lens and partially abutting against the image side surface of the eighth lens. The maximum axial height L of the lens barrel and the effective focal length f of the optical imaging device satisfy: 1.40 ≤ L / f ≤ 1.53. The radius of curvature R11 of the object side surface of the sixth lens, the radius of curvature R12 of the image side surface of the sixth lens, and the Abbe number V6 of the sixth lens satisfy: 13.76 ≤ R11 / R12 × V6 ≤ 15.93. The interval distance EP56 on the optical axis from the image side surface of the fifth spacer element to the object side surface of the sixth spacer element, the central thickness CT6 of the sixth lens on the optical axis, and the radius of curvature R11 of the object side surface of the sixth lens satisfy: -9.58 ≤ EP56 / CT6 × R11 ≤ -5.86.

[0009] Further, the object side surface of the fourth lens is convex, and the inner diameter d3m of the image side surface of the third spacer element, the outer diameter D3m of the image side surface of the third spacer element, and the radius of curvature R7 of the object side surface of the fourth lens satisfy: 0.90 ≤ (d3m + D3m) / R7 ≤ 1.63.

[0010] Further, the inner diameter d8s of the object side surface of the eighth spacer element, the radius of curvature R15 of the object side surface of the eighth lens, and the radius of curvature R16 of the image side surface of the eighth lens satisfy: -1.90 ≤ d8s / (R15 + R16) ≤ 1.25.

[0011] Furthermore, the distance EP23 between the image side surface of the second spacer element and the object side surface of the third spacer element on the optical axis and the distance EP34 between the image side surface of the third spacer element and the object side surface of the fourth spacer element on the optical axis satisfy: 0.64 ≤ EP23 / EP34 ≤ 1.42.

[0012] Furthermore, the outer diameter D7m of the image side surface of the seventh spacer element, the inner diameter d8s of the object side surface of the eighth spacer element, and the central thickness CT8 of the eighth lens on the optical axis satisfy: 0.12 ≤ (D7m - d8s) / CT8 ≤ 1.34.

[0013] Furthermore, the maximum axial height L of the lens barrel, the sum ∑AT of the air gaps between adjacent two lenses among the first lens to the eighth lens on the optical axis, and the air interval T34 between the third lens and the fourth lens on the optical axis satisfy: 8.44 ≤ (L - ∑AT) / T34 ≤ 10.43.

[0014] Furthermore, the object side surface of the seventh lens is convex, and the outer diameter D6m of the image side surface of the sixth spacer element, the inner diameter d6m of the image side surface of the sixth spacer element, and the curvature radius R13 of the object side surface of the seventh lens satisfy: 0.17 ≤ (D6m - d6m) / R13 ≤ 1.61.

[0015] Furthermore, the outer diameter D0s of the object side end surface of the lens barrel, the inner diameter d1s of the object side surface of the first spacer element, and the central thickness CT1 of the first lens on the optical axis satisfy: 6.78 ≤ (D0s - d1s) / CT1 ≤ 7.95.

[0016] Furthermore, the sixth lens has a negative focal power, and the effective focal length f6 of the sixth lens, the distance EP56 between the image side surface of the fifth spacer element and the object side surface of the sixth spacer element on the optical axis, and the central thickness CT6 of the sixth lens on the optical axis satisfy: 4.89 ≤ |f6| / (EP56 + CT6) ≤ 8.06.

[0017] Furthermore, the second lens has a positive focal power, and the effective focal length f2 of the second lens, the refractive index N2 of the second lens, and the inner diameter d2m of the image side surface of the second spacer element satisfy: 2.88 ≤ f2×N2 / d2m ≤ 4.48.

[0018] Furthermore, the distance from the object side end surface of the lens barrel to the object side surface of the first spacer element and the sum ∑EP of the distances between adjacent two spacer elements among the first spacer element to the eighth spacer element on the optical axis and the distance EP12 between the image side surface of the first spacer element and the object side surface of the second spacer element on the optical axis satisfy: 10.49 ≤ ∑EP / EP12 ≤ 13.27.

[0019] Furthermore, the image side of the seventh lens is concave, and the following condition is satisfied between the radius of curvature R14 of the image side of the seventh lens and the inner diameter d7s of the object side of the seventh spacer element: 0.93 ≤ R14 / d7s ≤ 1.71.

[0020] Furthermore, the following condition is satisfied among the radius of curvature R10 of the image side of the fifth lens, the outer diameter D5m of the image side of the fifth spacer element, and the refractive index N5 of the fifth lens: -2.47 ≤ R10 × N5 / D5m ≤ -1.68.

[0021] Furthermore, the following condition is satisfied among the axial distance EP78 on the optical axis from the image side of the seventh spacer element to the object side of the eighth spacer element, the axial thickness CP8 of the eighth spacer element, and the central thickness CT8 of the eighth lens on the optical axis: 2.04 ≤ (EP78 + CP8) / CT8 ≤ 2.71.

[0022] Furthermore, the spacer element group further includes one or two auxiliary spacer elements disposed between the sixth spacer element and the seventh lens, and a third auxiliary spacer element disposed between the third spacer element and the fourth lens.

[0023] Furthermore, the third lens has a negative focal power, the fifth lens has a positive focal power, and the seventh lens has a positive focal power; the image side of the first lens is concave, the object side of the second lens is convex, the object side of the third lens is convex, the image side of the third lens is concave, the image side of the fourth lens is concave, and the object side of the fifth lens is convex.

[0024] Applying the technical solution of the present invention, the optical imaging device of the present application is composed of a lens barrel and eight lenses and a plurality of spacer elements arranged in the lens barrel. By reasonably setting that the first lens has a positive optical power and its object side is convex, the fourth lens has a negative optical power, the image side of the fifth lens is convex, the object side and the image side of the sixth lens are concave and convex respectively, the eighth lens has a negative optical power and its image side is concave, and restricting the positions of the first spacer element to the eighth spacer element and 5.19≤L / ∑CP≤10.92, 13.76≤R11 / R12×V6≤15.93, it can be seen that when the sixth lens uses a high-dispersion material, it is easy to cause certain restrictions on the curvatures of the two surfaces of the sixth lens, and further limit the size design of the edge structure of the sixth lens, increasing the design difficulty of the lens structure arrangement. Blind arrangement design will lead to unreasonable and unstable transitions of the spacer elements before and after the sixth lens. During the assembly process, the sixth lens is prone to assembly deformation and stress concentration, affecting the assembly stability of the optical imaging device. Therefore, in the present application, by restricting 2.68≤(EP56+∑CP6) / CT6≤3.90, by controlling the ratio of the sum of the axial distances between the fifth spacer element and the sixth spacer element on the optical axis and the sum of the axial thicknesses of all spacer elements located between the sixth lens and the seventh lens to the central thickness of the sixth lens on the optical axis within a certain range, it is beneficial to reasonably design the size of the edge structure of the sixth lens, balance the edge thickness and the central thickness of the sixth lens. Since the edge structure of the sixth lens is used to abut against the lens barrel, the fifth spacer element, and the sixth spacer element, it is beneficial to ensure the reasonable arrangement of the sixth lens and the front and rear spacer elements in the lens barrel, so as to reduce the risk of deformation and stress concentration generated by the sixth lens during assembly, and further ensure the assembly stability of the optical imaging device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0026] Figure 1 shows the dimension marking diagram of the optical imaging device according to an optional embodiment of the present invention;

[0027] Figure 2 shows the structural schematic diagram of the optical imaging device of Embodiment 1-1 of the present invention;

[0028] Figure 3 shows the structural schematic diagram of the optical imaging device of Embodiment 1-2 of the present invention;

[0029] Figure 4 shows the structural schematic diagram of the optical imaging device of Embodiment 1-3 of the present invention;

[0030] Figures 5 to 8 respectively show the longitudinal chromatic aberration curve, axial chromatic aberration curve, astigmatism curve and distortion curve of the optical imaging device according to the first embodiment of the present invention;

[0031] Figure 9 shows a schematic structural diagram of the optical imaging device according to Embodiment 2-1 of the present invention;

[0032] Figure 10 shows a schematic structural diagram of the optical imaging device according to Embodiment 2-2 of the present invention;

[0033] Figure 11 shows a schematic structural diagram of the optical imaging device according to Embodiment 2-3 of the present invention;

[0034] Figures 12 to 15 respectively show the longitudinal chromatic aberration curve, axial chromatic aberration curve, astigmatism curve and distortion curve of the optical imaging device according to the second embodiment of the present invention;

[0035] Figure 16 shows a schematic structural diagram of the optical imaging device according to Embodiment 3-1 of the present invention;

[0036] Figure 17 shows a schematic structural diagram of the optical imaging device according to Embodiment 3-2 of the present invention;

[0037] Figure 18 shows a schematic structural diagram of the optical imaging device according to Embodiment 3-3 of the present invention;

[0038] Figures 19 to 22 respectively show the longitudinal chromatic aberration curve, axial chromatic aberration curve, astigmatism curve and distortion curve of the optical imaging device according to the third embodiment of the present invention;

[0039] Figure 23 shows the assembled local stress diagram of the optical imaging device according to Solution 1 of the present application when 5.19 ≤ L / ∑CP ≤ 10.92, 13.76 ≤ R11 / R12 × V6 ≤ 15.93 and (EP56 + ∑CP6) / CT6 = 3.80;

[0040] Figure 24 shows the assembled local stress diagram of the optical imaging device according to Solution 2 of the present application when 5.19 ≤ L / ∑CP ≤ 10.92, 13.76 ≤ R11 / R12 × V6 ≤ 15.93 and (EP56 + ∑CP6) / CT6 = 2.90;

[0041] Figure 25The assembled local stress diagram is shown when the optical imaging device of Comparative Example 1 satisfies 5.19 ≤ L / ∑CP ≤ 10.92, 13.76 ≤ R11 / R12 × V6 ≤ 15.93, and (EP56 + ∑CP6) / CT6 = 4.83;

[0042] Figure 26 The assembled local stress diagram is shown when the optical imaging device of Comparative Example 2 satisfies 5.19 ≤ L / ∑CP ≤ 10.92, 13.76 ≤ R11 / R12 × V6 ≤ 15.93, and (EP56 + ∑CP6) / CT6 = 2.30.

[0043] Wherein, the above-mentioned drawings include the following reference numerals:

[0044] P0, lens barrel; E1, first lens; S1, object side of the first lens; S2, image side of the first lens; E2, second lens; S3, object side of the second lens; S4, image side of the second lens; E3, third lens; S5, object side of the third lens; S6, image side of the third lens; E4, fourth lens; S7, object side of the fourth lens; S8, image side of the fourth lens; E5, fifth lens; S9, object side of the fifth lens; S10, image side of the fifth lens; E6, sixth lens; S11, object side of the sixth lens; S12, image side of the sixth lens; E7, seventh lens; S13, object side of the seventh lens; S14, image side of the seventh lens; E8, eighth lens; S15, object side of the eighth lens; S16, image side of the eighth lens; P1, first spacer element; P2, second spacer element; P3, third spacer element; P4, fourth spacer element; P5, fifth spacer element; P6, sixth spacer element; P7, seventh spacer element; P8, eighth spacer element. Detailed Embodiments

[0045] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0046] It should be pointed out that unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0047] In the present invention, unless otherwise stated, the orientation terms such as "upper, lower, top, bottom" are generally in the direction shown in the drawings, or in the vertical, perpendicular or gravitational direction of the component itself; similarly, for the convenience of understanding and description, "inner, outer" refer to the inner and outer of the contour of each component itself, but the above orientation terms do not limit the present invention.

[0048] It should be noted that in this specification, the expressions such as first, second, third, etc. are only used to distinguish one feature from another, and do not represent any limitation on the features. Therefore, without departing from the teachings of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0049] In the drawings, for the sake of clarity, the thickness, size and shape of the lens have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are shown by way of example. That is, the spherical or aspherical shapes are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are only examples and are not drawn to an exact scale.

[0050] In this text, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The judgment of the surface shape in the paraxial region can be based on the judgment method of those with ordinary knowledge in the field, and the sign of the R value (R refers to the radius of curvature in the paraxial region, usually the R value on the lens database in optical software) is used to judge the convexity and concavity. Taking the object side surface as an example, when the R value is positive, it is judged to be convex, and when the R value is negative, it is judged to be concave; taking the image side surface as an example, when the R value is positive, it is judged to be concave, and when the R value is negative, it is judged to be convex. In the present application, the left side is the object side and the right side is the image side.

[0051] In order to solve the problem in the prior art that the eight-piece optical imaging device selects the end lens as a high-dispersion material, resulting in an unreasonable size of the end lens, and further causing stress concentration and deformation during assembly, the present invention provides an optical imaging device.

[0052] As Figures 1 to 24 shown, in an alternative embodiment of the present application, the optical imaging device includes a lens barrel and a lens group and a spacer element group disposed in the lens barrel.

[0053] The lens group is composed of eight lenses. The eight lenses are, in order from the object side to the image side, a first lens with positive optical power, a second lens with optical power, a third lens with optical power, a fourth lens with negative optical power, a fifth lens with optical power, a sixth lens with optical power, a seventh lens with optical power, and an eighth lens with negative optical power; the object side surface of the first lens is convex, the image side surface of the fifth lens is convex, the object side surface of the sixth lens is concave, the image side surface of the sixth lens is convex, and the image side surface of the eighth lens is concave; there are air gaps between adjacent two of the first lens to the eighth lens on the optical axis of the optical imaging device.

[0054] The spacer element group includes a first spacer element placed between the first lens and the second lens and abutting against the image-side surface portion of the first lens, a second spacer element placed between the second lens and the third lens and abutting against the image-side surface portion of the second lens, a third spacer element placed between the third lens and the fourth lens and abutting against the image-side surface portion of the third lens, a fourth spacer element placed between the fourth lens and the fifth lens and abutting against the image-side surface portion of the fourth lens, a fifth spacer element placed between the fifth lens and the sixth lens and abutting against the image-side surface portion of the fifth lens, a sixth spacer element placed between the sixth lens and the seventh lens and abutting against the image-side surface portion of the sixth lens, a seventh spacer element placed between the seventh lens and the eighth lens and abutting against the image-side surface portion of the seventh lens, and an eighth spacer element placed on the image side of the eighth lens and abutting against the image-side surface portion of the eighth lens.

[0055] The maximum axial height L of the lens barrel and the sum ∑CP of the axial thicknesses of all the spacer elements of the optical imaging device satisfy: 5.19 ≤ L / ∑CP ≤ 10.92; the radius of curvature R11 of the object-side surface of the sixth lens, the radius of curvature R12 of the image-side surface of the sixth lens, and the Abbe number V6 of the sixth lens satisfy: 13.76 ≤ R11 / R12 × V6 ≤ 15.93; the distance EP56 on the optical axis from the image-side surface of the fifth spacer element to the object-side surface of the sixth spacer element, the sum ∑CP6 of the axial thicknesses of all the spacer elements between the sixth lens and the seventh lens, and the central thickness CT6 of the sixth lens on the optical axis satisfy: 2.68 ≤ (EP56 + ∑CP6) / CT6 ≤ 3.90.

[0056] The optical imaging device of the present application consists of a lens barrel and eight lenses and multiple spacer elements arranged in the lens barrel. By reasonably setting that the first lens has a positive optical power and its object side is convex, the fourth lens has a negative optical power, the image side of the fifth lens is convex, the object side and the image side of the sixth lens are concave and convex respectively, the eighth lens has a negative optical power and its image side is concave, and by restricting the positions of the first spacer element to the eighth spacer element and 5.19 ≤ L / ∑CP ≤ 10.92, 13.76 ≤ R11 / R12 × V6 ≤ 15.93, it can be seen that when the sixth lens uses a high-dispersion material, it is easy to cause certain restrictions on the curvatures of the two side surfaces of the sixth lens, and further limit the size design of the edge structure of the sixth lens, increasing the design difficulty of the lens structure arrangement. Blind arrangement design will lead to unreasonable and unstable transitions of the spacer elements before and after the sixth lens. During the assembly process, the sixth lens is prone to assembly deformation and stress concentration, affecting the assembly stability of the optical imaging device. Therefore, in the present application, by restricting 2.68 ≤ (EP56 + ∑CP6) / CT6 ≤ 3.90, by controlling the ratio of the spacing distance between the fifth spacer element and the sixth spacer element on the optical axis to the sum of the axial thicknesses of all spacer elements located between the sixth lens and the seventh lens and the central thickness of the sixth lens on the optical axis within a certain range, it is beneficial to reasonably design the size of the edge structure of the sixth lens, balance the edge thickness and the central thickness of the sixth lens. Since the edge structure of the sixth lens is used to abut against the lens barrel, the fifth spacer element, and the sixth spacer element, it is beneficial to ensure the reasonable arrangement of the sixth lens and the front and rear spacer elements in the lens barrel, so as to reduce the risk of deformation and stress concentration generated by the sixth lens during assembly, and further ensure the assembly stability of the optical imaging device.

[0057] It should be noted that the maximum axial height L of the lens barrel is the spacing distance along the optical axis from the object side end face of the lens barrel to the image side end face of the lens barrel.

[0058] In addition, referring to Table 1 below, Figures 23 to 26 as shown, on the premise that the optical imaging device satisfies 5.19 ≤ L / ∑CP ≤ 10.92, 13.76 ≤ R11 / R12 × V6 ≤ 15.93, for example, L / ∑CP = 5.23, R11 / R12 × V6 = 15.93, or L / ∑CP = 5.19, R11 / R12 × V6 = 13.76. Figure 23 The assembled local stress diagram of the optical imaging device of Solution 1 of the present application when (EP56 + ∑CP6) / CT6 = 3.80 is shown, Figure 24 The assembled local stress diagram of the optical imaging device of Solution 2 of the present application when (EP56 + ∑CP6) / CT6 = 2.90 is shown, Figure 25The assembled local stress diagram is shown when the optical imaging device of Comparative Example 1 satisfies (EP56 + ∑CP6) / CT6 = 4.83. Figure 26 The assembled local stress diagram is shown when the optical imaging device of Comparative Example 2 satisfies (EP56 + ∑CP6) / CT6 = 2.30.

[0059] From 23 to Figure 26 It can be seen that when the optical imaging device satisfies (EP56 + ∑CP6) / CT6 = 3.80, during the assembly process, the maximum value of the stress generated by the sixth lens is 12.805 Mpa and the minimum value is 0.0010919 Mpa. The stress generated by the sixth lens is small, the deformation of the sixth lens during the assembly process is small, and the assembly stability is better. When the optical imaging device satisfies (EP56 + ∑CP6) / CT6 = 2.90, during the assembly process, the maximum value of the stress generated by the sixth lens is 12.566 Mpa and the minimum value is 0.0019303 Mpa. The stress generated by the sixth lens is small, the deformation of the sixth lens during the assembly process is small, and the assembly stability is better. When the optical imaging device satisfies (EP56 + ∑CP6) / CT6 = 4.83, during the assembly process, the maximum value of the stress generated by the sixth lens is 29.694 Mpa and the minimum value is 0.00052836 Mpa. The stress on the sixth lens is large, which is likely to cause deformation or even fracture of the sixth lens, affecting the normal assembly of the optical imaging device. When the optical imaging device satisfies (EP56 + ∑CP6) / CT6 = 2.30, during the assembly process, the maximum value of the stress generated by the sixth lens is 29.795 Mpa and the minimum value is 0.0037298 Mpa. The local stress of the sixth lens increases, which is likely to cause deformation of the sixth lens, affecting the normal assembly of the optical imaging device.

[0060] Thus, it can be seen that when 5.19 ≤ L / ∑CP ≤ 10.92, 13.76 ≤ R11 / R12 × V6 ≤ 15.93 and (EP56 + ∑CP6) / CT6 is controlled within the range of 2.68 to 3.90, the stress generated by the sixth lens during the assembly process is small, the deformation of the sixth lens is small, and the assembly stability is the best. Therefore, in the present application, by restricting 5.19 ≤ L / ∑CP ≤ 10.92, 13.76 ≤ R11 / R12 × V6 ≤ 15.93 and 2.68 ≤ (EP56 + ∑CP6) / CT6 ≤ 3.90. On the basis of meeting the requirements of structural compactness and imaging, it is beneficial to reasonably design the size of the edge structure of the sixth lens, balance the edge thickness and the center thickness of the sixth lens. Since the edge structure of the sixth lens is used to abut against the lens barrel, the fifth spacer element, and the sixth spacer element, it is beneficial to ensure the reasonable arrangement of the sixth lens and the front and rear spacer elements in the lens barrel, so as to reduce the risk of deformation and stress concentration generated by the sixth lens during assembly, and further ensure the assembly stability of the optical imaging device.

[0061] Table 1

[0062] Scheme 1 of this application Scheme 2 of this application Comparative Example 1 Comparative Example 2 (EP56 + ∑CP6) / CT6 3.80 2.90 4.83 2.30

[0063] In an alternative embodiment of the present application, the spacer element group consists only of the first to eighth spacer elements, and no auxiliary spacer element is provided. At this time, ∑CP is the sum of the axial thicknesses of the first to eighth spacer elements, and ∑CP6 is the axial thickness of the sixth spacer element.

[0064] In another alternative embodiment of the present application, the spacer element group further includes one or two auxiliary spacer elements disposed between the sixth spacer element and the seventh lens, and a third auxiliary spacer element disposed between the third spacer element and the fourth lens. When one auxiliary spacer element is provided between the sixth spacer element and the seventh lens and a third auxiliary spacer element is provided between the third spacer element and the fourth lens, the auxiliary spacer element between the sixth spacer element and the seventh lens is the sixth auxiliary spacer element. At this time, ∑CP is the sum of the axial thicknesses of the first to eighth spacer elements, the third auxiliary spacer element, and the sixth auxiliary spacer element, and ∑CP6 is the sum of the axial thicknesses of the sixth spacer element and the sixth auxiliary spacer element.

[0065] In another alternative embodiment of the present application, the difference between this embodiment and the previous alternative embodiment is that a seventh auxiliary spacer element is further provided between the seventh spacer element and the eighth lens. At this time, ∑CP is the sum of the axial thicknesses of the first to eighth spacer elements, the third auxiliary spacer element, the sixth auxiliary spacer element, and the seventh auxiliary spacer element.

[0066] In another alternative embodiment of the present application, the spacer element group further includes two auxiliary spacer elements disposed between the sixth spacer element and the seventh lens. The two auxiliary spacer elements are respectively the sixth auxiliary spacer element and the sixth sub-auxiliary spacer element. The sixth sub-auxiliary spacer element is located on the image side of the sixth auxiliary spacer element, and a third auxiliary spacer element disposed between the third spacer element and the fourth lens. At this time, ∑CP is the sum of the axial thicknesses of the first to eighth spacer elements, the third auxiliary spacer element, the sixth auxiliary spacer element, and the sixth sub-auxiliary spacer element, and ∑CP6 is the sum of the axial thicknesses of the sixth spacer element, the sixth auxiliary spacer element, and the sixth sub-auxiliary spacer element.

[0067] In this embodiment, the object side surface of the fourth lens is convex, and the following condition is satisfied among the inner diameter d3m of the image side surface of the third spacer element, the outer diameter D3m of the image side surface of the third spacer element, and the curvature radius R7 of the object side surface of the fourth lens: 0.90 ≤ (d3m + D3m) / R7 ≤ 1.63. Such a setting can control the ratio of the sum of the outer diameter and the inner diameter of the image side surface of the third spacer element to the curvature radius of the object side surface of the fourth lens, optimize the performance of the system, ensure that the third spacer element does not get too close to or too far away from the fourth lens, and guarantee that the third spacer element can effectively intercept unnecessary stray light, thereby avoiding aberration, light blocking, or other optical problems.

[0068] In this embodiment, the following condition is satisfied among the inner diameter d8s of the object side surface of the eighth spacer element, the curvature radius R15 of the object side surface of the eighth lens, and the curvature radius R16 of the image side surface of the eighth lens: -1.90 ≤ d8s / (R15 + R16) ≤ 1.25. By restricting the ratio of the inner diameter of the object side surface of the eighth spacer element to the sum of the curvature radii of the object side surface and the image side surface of the eighth lens, size interference between the eighth spacer element and the eighth lens can be avoided, ensuring that the imaging light does not get blocked or deflected and can pass smoothly through the eighth spacer element and the eighth lens, while improving the stability and reliability of the system.

[0069] In this embodiment, the following condition is satisfied between the axial distance EP23 from the image side surface of the second spacer element to the object side surface of the third spacer element and the axial distance EP34 from the image side surface of the third spacer element to the object side surface of the fourth spacer element: 0.64 ≤ EP23 / EP34 ≤ 1.42. By controlling the ratio of the axial distance from the image side surface of the second spacer element to the object side surface of the third spacer element to the axial distance from the image side surface of the third spacer element to the object side surface of the fourth spacer element, the thickness distribution of the edge structures of the third lens and the fourth lens is controlled, and at the same time, the forming stability of the third lens and the fourth lens is ensured.

[0070] In this embodiment, the following condition is satisfied among the outer diameter D7m of the image side surface of the seventh spacer element, the inner diameter d8s of the object side surface of the eighth spacer element, and the central thickness CT8 of the eighth lens on the optical axis: 0.12 ≤ (D7m - d8s) / CT8 ≤ 1.34. By restricting the difference between the outer diameter of the image side surface of the seventh spacer element and the inner diameter of the object side surface of the eighth spacer element, while ensuring that there is enough imaging light passing through stably, it is guaranteed that the seventh spacer element and the eighth spacer element can intercept stray light, effectively avoiding unnecessary stray light from reaching the imaging surface, which helps to reduce aberration and distortion in the system and improve the imaging quality; at the same time, by controlling the central thickness of the eighth lens relative to the size difference between the seventh spacer element and the eighth spacer element, the compactness of the optical imaging device is maintained to a certain extent, avoiding assembly difficulties or performance problems caused by an overly thick lens, and improving the overall performance.

[0071] In this embodiment, the maximum axial height L of the lens barrel, the sum ∑AT of the air gaps on the optical axis between two adjacent lenses among the first lens to the eighth lens, and the air interval T34 between the third lens and the fourth lens on the optical axis satisfy: 8.44 ≤ (L - ∑AT) / T34 ≤ 10.43. ∑AT is the sum of the air gaps on the optical axis between any two adjacent lenses among the first lens to the eighth lens. By controlling this expression, the maximum axial height of the lens barrel and the air gaps between adjacent lenses are restricted, ensuring the compactness of the spatial dimensions of the optical imaging device, which is beneficial to the reduction of the volume and the lightening of the weight of the optical imaging device; at the same time, the air interval between the third lens and the fourth lens on the optical axis is controlled, which plays a role in reducing chromatic aberration and suppressing the reflection and scattering of internal light rays in the optical imaging device, and is beneficial to improving the imaging quality and overall performance of the optical imaging device.

[0072] In this embodiment, the object side surface of the seventh lens is convex, and the outer diameter D6m of the image side surface of the sixth spacer element, the inner diameter d6m of the image side surface of the sixth spacer element, and the curvature radius R13 of the object side surface of the seventh lens satisfy: 0.17 ≤ (D6m - d6m) / R13 ≤ 1.61. By controlling the difference between the outer diameter and the inner diameter of the sixth spacer element, it is ensured that the sixth spacer element can effectively block unnecessary stray light rays, and by controlling the outer diameter of the sixth spacer element, it is beneficial to ensure the stability and uniformity of the wall thickness of the lens barrel; on this premise, the curvature radius of the object side surface of the seventh lens is further controlled to ensure that the seventh lens can effectively receive and cooperate with the front and rear lenses, reduce the aberration of the overall system, and improve the resolution.

[0073] In this embodiment, the outer diameter D0s of the object side end face of the lens barrel, the inner diameter d1s of the object side surface of the first spacer element, and the central thickness CT1 of the first lens on the optical axis satisfy: 6.78 ≤ (D0s - d1s) / CT1 ≤ 7.95. By restricting the difference between the outer diameter of the object side end face of the lens barrel and the inner diameter of the first spacer element, it can be ensured that the optical imaging device has sufficient light transmission and that the first spacer element can intercept stray light rays, avoiding the passage of excessive stray light rays and improving the imaging quality; at the same time, restricting the central thickness of the first lens is beneficial to controlling the overall shape of the central effective diameter part of the first lens and ensuring the processing and forming stability of the first lens.

[0074] In this embodiment, the sixth lens has a negative optical power, and the following condition is satisfied among the effective focal length f6 of the sixth lens, the axial distance EP56 between the image side surface of the fifth spacer element and the object side surface of the sixth spacer element, and the central thickness CT6 of the sixth lens on the optical axis: 4.89 ≤ |f6| / (EP56 + CT6) ≤ 8.06. By controlling the sixth lens to have a negative optical power and the magnitude of the effective focal length f6, it can be ensured that the sixth lens can effectively receive the imaging light passing through the fifth lens and simultaneously transfer it effectively to the seventh lens, thereby indirectly ensuring the magnification, field of view angle, and depth of field of the optical imaging device. Moreover, the control of the axial distance between the image side surface of the fifth spacer element and the object side surface of the sixth spacer element and the central thickness of the sixth lens on the optical axis ensures the reasonable size of the sixth lens, and further ensures the reasonable overall layout and compactness of the optical imaging device, thus being conducive to ensuring the stability of assembly and the stability of structural transition.

[0075] In this embodiment, the second lens has a positive optical power, and the following condition is satisfied among the effective focal length f2 of the second lens, the refractive index N2 of the second lens, and the inner diameter d2m of the image side surface of the second spacer element: 2.88 ≤ f2 × N2 / d2m ≤ 4.48. By controlling the effective focal length of the second lens and the refractive index of the second lens, it is ensured that while there is sufficient light passing through the second lens, it is transferred to the subsequent lenses more efficiently. Then, by controlling the inner diameter of the second spacer element, unnecessary stray light rays are intercepted, improving the overall imaging quality.

[0076] In this embodiment, the following condition is satisfied between the distance from the object side end surface of the lens barrel to the object side surface of the first spacer element and the sum ∑EP of the axial distances between adjacent two of the first spacer element to the eighth spacer element and the axial distance EP12 between the image side surface of the first spacer element and the object side surface of the second spacer element: 10.49 ≤ ∑EP / EP12 ≤ 13.27. By restricting the sum of the distances between all adjacent spacer elements, while ensuring the reasonable size of the optical imaging device, the internal space of the optical imaging device is optimized. Further controlling the distance between the image side surface of the first spacer element and the object side surface of the second spacer element ensures the stability of the first spacer element and the second spacer element as the basis for the arrangement of the entire system, improving the stability of the imaging quality of the overall system.

[0077] It should be explained here that ∑EP is specifically the sum of the distance from the object-side end face of the lens barrel to the object-side surface of the first spacer element, the axial distance between the image-side surface of the first spacer element and the object-side surface of the second spacer element on the optical axis, the axial distance between the image-side surface of the second spacer element and the object-side surface of the third spacer element on the optical axis, the axial distance between the image-side surface of the third spacer element and the object-side surface of the fourth spacer element on the optical axis, the axial distance between the image-side surface of the fourth spacer element and the object-side surface of the fifth spacer element on the optical axis, the axial distance between the image-side surface of the fifth spacer element and the object-side surface of the sixth spacer element on the optical axis, the axial distance between the image-side surface of the sixth spacer element and the object-side surface of the seventh spacer element on the optical axis, and the axial distance between the image-side surface of the seventh spacer element and the object-side surface of the eighth spacer element on the optical axis.

[0078] In this embodiment, the image-side surface of the seventh lens is concave, and the following condition is satisfied between the radius of curvature R14 of the image-side surface of the seventh lens and the inner diameter d7s of the object-side surface of the seventh spacer element: 0.93 ≤ R14 / d7s ≤ 1.71. By controlling this conditional expression, the radius of curvature of the seventh lens and the inner diameter of the seventh spacer element are restricted, which can adjust the propagation path of light before and after the seventh lens, and at the same time ensure that the seventh spacer element can intercept unnecessary stray light rays, thereby optimizing the imaging quality.

[0079] In this embodiment, the following condition is satisfied between the radius of curvature R10 of the image-side surface of the fifth lens, the outer diameter D5m of the image-side surface of the fifth spacer element, and the refractive index N5 of the fifth lens: -2.47 ≤ R10×N5 / D5m ≤ -1.68. Through the above expression, the refractive index of the fifth lens and the radius of curvature of the image-side surface of the fifth lens are restricted. On the premise of meeting the optical imaging requirements, the bending degree of the fifth lens is controlled to ensure that the fifth lens has good formability. At the same time, by restricting the outer diameter of the image-side surface of the fifth spacer element, the contact area between the fifth lens and the fifth spacer element can be controlled, which is beneficial to improving the assembly stability of the fifth lens.

[0080] In this embodiment, the following condition is satisfied between the axial distance EP78 between the image-side surface of the seventh spacer element and the object-side surface of the eighth spacer element on the optical axis, the axial thickness CP8 of the eighth spacer element, and the central thickness CT8 of the eighth lens on the optical axis: 2.04 ≤ (EP78 + CP8) / CT8 ≤ 2.71. By controlling EP78 and CP8, the stability of the abutment of the seventh spacer element, the eighth lens, and the eighth spacer element is ensured, and the rationality of the transition of the lens barrel size is guaranteed; at the same time, by controlling the central thickness of the eighth lens on the optical axis, the thickness ratio of the eighth lens can be controlled, ensuring the forming process ability of the eighth lens.

[0081] In this embodiment, the third lens has a negative optical power, the fifth lens has a positive optical power, and the seventh lens has a positive optical power; the image side surface of the first lens is concave, the object side surface of the second lens is convex, the object side surface of the third lens is convex, the image side surface of the third lens is concave, the image side surface of the fourth lens is concave, and the object side surface of the fifth lens is convex. By reasonably constraining the optical power and surface shape of each lens, it is beneficial to control the trend of light rays, ensure the smooth transition of light rays, and at the same time optimize aberrations and distortion to ensure imaging quality.

[0082] Optionally, the optical imaging device in the embodiment of the present application can be simulated by software and / or tools such as ZEMAX, CODEV, etc. During the simulation using the above-mentioned software and / or tools, the surface shape of each lens can be appropriately adjusted according to the surface shapes provided by the software and / or tools used.

[0083] In addition, in another optional embodiment of the present application, an optical imaging device is further provided, which includes a lens barrel and a lens group and a spacer element group disposed in the lens barrel.

[0084] The lens group is composed of eight lenses. The eight lenses are, in order from the object side to the image side, a first lens with a positive optical power, a second lens with an optical power, a third lens with an optical power, a fourth lens with a negative optical power, a fifth lens with an optical power, a sixth lens with an optical power, a seventh lens with an optical power, and an eighth lens with a negative optical power; the object side surface of the first lens is convex, the image side surface of the fifth lens is convex, the object side surface of the sixth lens is concave, the image side surface of the sixth lens is convex, and the image side surface of the eighth lens is concave; there are air gaps between adjacent two of the first lens to the eighth lens on the optical axis of the optical imaging device.

[0085] The spacer element group includes the first spacer element to the eighth spacer element in the above-mentioned embodiment.

[0086] The maximum axial height L of the lens barrel and the effective focal length f of the optical imaging device satisfy: 1.40 ≤ L / f ≤ 1.53; the radius of curvature R11 of the object side surface of the sixth lens, the radius of curvature R12 of the image side surface of the sixth lens and the Abbe number V6 of the sixth lens satisfy: 13.76 ≤ R11 / R12 × V6 ≤ 15.93; the sixth lens has a negative optical power, and the effective focal length f6 of the sixth lens, the interval distance EP56 on the optical axis from the image side surface of the fifth spacer element to the object side surface of the sixth spacer element and the central thickness CT6 of the sixth lens on the optical axis satisfy: 4.89 ≤ |f6| / (EP56 + CT6) ≤ 8.06.

[0087] The optical imaging device of the present application consists of a lens barrel and eight lenses and multiple spacer elements arranged in the lens barrel. By reasonably setting that the first lens has a positive focal power and its object side is convex, the fourth lens has a negative focal power, the image side of the fifth lens is convex, the object side and the image side of the sixth lens are concave and convex respectively, the eighth lens has a negative focal power and its image side is concave, and by restricting the positions of the first spacer element to the eighth spacer element, and 1.40 ≤ L / f ≤ 1.53 and 13.76 ≤ R11 / R12 × V6 ≤ 15.93, it can be seen that when the sixth lens uses a material with high dispersion, the compression of the overall size limits the design of the size of the sixth lens, increasing the difficulty of the structural arrangement and design of the sixth lens. Therefore, in the present application, by restricting 4.89 ≤ |f6| / (EP56 + CT6) ≤ 8.06, by controlling the sixth lens to have a negative focal power and the magnitude of the effective focal length f6, it can be ensured that the sixth lens can effectively receive the imaging light passing through the fifth lens and at the same time effectively transmit it to the seventh lens, thereby indirectly ensuring the magnification, field of view angle and depth of field of the optical imaging device; and by controlling the distance between the image side of the fifth spacer element and the object side of the sixth spacer element on the optical axis and the central thickness of the sixth lens on the optical axis, the dimensional rationality of the sixth lens at the tail end is ensured, and further the reasonable arrangement of the sixth lens in the lens barrel is ensured, ensuring the stability of the structural transition and the smoothness of the light transmission.

[0088] Of course, other parametric forms in the above embodiments may also be included in this embodiment, which will not be elaborated here one by one.

[0089] In addition, in another optional embodiment of the present application, an optical imaging device is further provided, which includes a lens barrel and a lens group and a spacer element group arranged in the lens barrel. The lens group consists of eight lenses. The eight lenses are, in order from the object side to the image side, a first lens with a positive focal power, a second lens with a focal power, a third lens with a focal power, a fourth lens with a negative focal power, a fifth lens with a focal power, a sixth lens with a focal power, a seventh lens with a focal power, and an eighth lens with a negative focal power; the object side of the first 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, and the image side of the eighth lens is concave; there are air gaps between adjacent two of the first lens to the eighth lens on the optical axis of the optical imaging device.

[0090] The spacer element group includes the first spacer element to the eighth spacer element in the above embodiment.

[0091] The maximum axial height L of the lens barrel and the effective focal length f of the optical imaging device satisfy: 1.40 ≤ L / f ≤ 1.53; the curvature radius R11 of the object side of the sixth lens, the curvature radius R12 of the image side of the sixth lens and the Abbe number V6 of the sixth lens satisfy: 13.76 ≤ R11 / R12 × V6 ≤ 15.93; the interval distance EP56 on the optical axis from the image side of the fifth spacer element to the object side of the sixth spacer element, the central thickness CT6 of the sixth lens on the optical axis and the curvature radius R11 of the object side of the sixth lens satisfy: -9.58 ≤ EP56 / CT6 × R11 ≤ -5.86.

[0092] The optical imaging device of the present application is composed of a lens barrel and eight lenses and multiple spacer elements arranged in the lens barrel. By reasonably setting that the first lens has a positive optical power and its object side is convex, the fourth lens has a negative optical power, the image side of the fifth lens is convex, the object side and the image side of the sixth lens are concave and convex respectively, the eighth lens has a negative optical power and its image side is concave, and restricting the positions of the first spacer element to the eighth spacer element and 1.40 ≤ L / f ≤ 1.53 and 13.76 ≤ R11 / R12 × V6 ≤ 15.93, it can be seen that when the sixth lens uses a material with high dispersion, the compression of the overall size limits the design of the size of the sixth lens, increasing the difficulty of the structural arrangement and design of the sixth lens. Therefore, by restricting -9.58 ≤ EP56 / CT6 × R11 ≤ -5.86 in the present application, it is beneficial to restrict the shape and size of the sixth lens, ensure the rationality of the size of the sixth lens, and then ensure that the sixth lens can effectively receive the imaging light passing through the fifth lens and effectively transmit it to the seventh lens, ensure the smoothness of light transmission, and ensure the rationality and compactness of the overall layout of the optical imaging device.

[0093] Of course, other parametric forms in the above embodiments may also be included in this embodiment, which will not be elaborated here one by one.

[0094] Optionally, the above optical imaging device may further include a protective glass for protecting the photosensitive element located on the imaging surface.

[0095] The optical imaging device in the present application may use multiple lenses, such as the eight lenses mentioned above. In the present application, at least one of the lens surfaces of each lens is an aspherical lens surface. The characteristics of an aspherical lens are that the curvature changes continuously from the center of the lens to the periphery of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and improving astigmatism aberration. After using an aspherical lens, it is possible to eliminate the aberration that appears during imaging as much as possible, thereby improving the imaging quality.

[0096] However, those skilled in the art should understand that, without departing from the technical solutions claimed in this application, the number of lenses constituting the optical imaging device can be changed to obtain the various results and advantages described in this specification. For example, although eight lenses are described as an example in the embodiments, the optical imaging device is not limited to including eight lenses. If necessary, the optical imaging device may also include other numbers of lenses.

[0097] Figure 1 A schematic diagram of the dimension markings of an optical imaging device of this application is shown. Figure 1 Parameters such as d1s, d2m, d3m, D3m, D0s, D5m, d6m, D6m, d7s, D7m, d8s, EP12, EP23, EP34, EP56, EP78, L, CP8, and ∑CP6 are marked in it to clearly and intuitively understand the meaning of the parameters. For the convenience of describing the surface shapes of the optical imaging device and specific lenses, these parameters will no longer be shown in the drawings when specific embodiments are described later.

[0098] The following further describes with reference to the drawings examples of the specific surface shapes and parameters of the optical imaging device applicable to the above embodiments.

[0099] It should be noted that in the following Example 1, there are three examples: Example 1-1, Example 1-2, and Example 1-3. In Example 2, there are three examples: Example 2-1, Example 2-2, and Example 2-3. In Example 3, there are three examples: Example 3-1, Example 3-2, and Example 3-3. The curvature radii, central thicknesses, etc. of the first lens to the eighth lens of the optical imaging device under the three examples in the same embodiment, as well as the spacing distances and high-order term coefficients between the lenses, are the same, but the parameters such as the lens barrel, the thicknesses, inner diameters, and outer diameters of the first spacer element to the eighth spacer element are different. Or rather, the main structures for imaging are the same, while the auxiliary structures for imaging are different.

[0100] It should be noted that any of the following Examples 1 to 3 is applicable to all embodiments of this application.

[0101] Example 1

[0102] As Figures 2 to 8 shown, the optical imaging device of Example 1 is described. Figure 2 A schematic structural diagram of the optical imaging device of Example 1-1 is shown. Figure 3 A schematic structural diagram of the optical imaging device of Example 1-2 is shown. Figure 4 A schematic structural diagram of the optical imaging device of Example 1-3 is shown.

[0103] AsFigures 2 to 4 As shown, the optical imaging device includes a lens barrel P0 and a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fifth lens E5, a fifth spacer P5, a sixth lens E6, a sixth spacer P6, a seventh lens E7, a seventh spacer P7, an eighth lens E8, and an eighth spacer P8, which are sequentially arranged in the lens barrel P0 from the object side to the image side along the optical axis.

[0104] As Figure 2 shown, it is a schematic structural diagram of the optical imaging device of Embodiment 1-1. In this example, the object side surface and the image side surface of the first spacer P1 are partially in 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 P2 are partially in 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 P3 are partially in 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 P4 are partially in 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 P5 are partially in 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 P6 are partially in 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 P7 are partially in contact with the image side surface S14 of the seventh lens and the object side surface S15 of the eighth lens, respectively. The object side surface of the eighth spacer P8 is partially in contact with the image side surface S16 of the eighth lens.

[0105] As Figure 3 shown, it is a schematic structural diagram of the optical imaging device of Embodiment 1-2. The difference between this example and Embodiment 1-1 is that a third auxiliary spacer P3b is further provided on the image side of the third spacer P3, a sixth auxiliary spacer P6b is further provided on the image side of the sixth spacer P6, and a seventh auxiliary spacer P7b is further provided on the image side of the seventh spacer P7. At this time, the object side surface and the image side surface of the third auxiliary spacer P3b are partially in contact with the image side surface of the third spacer P3 and the object side surface S7 of the fourth lens, respectively. The object side surface and the image side surface of the sixth auxiliary spacer P6b are partially in contact with the image side surface of the sixth spacer P6 and the object side surface S13 of the seventh lens, respectively. The object side surface and the image side surface of the seventh auxiliary spacer P7b are partially in contact with the image side surface of the seventh spacer P7 and the object side surface S15 of the eighth lens, respectively. The contact and abutment manners of the remaining spacers are the same as those in Embodiment 1-1, and reference can be made to the relevant descriptions in Embodiment 1-1, which will not be elaborated here.

[0106] As Figure 4As shown, it is a schematic structural diagram of the optical imaging device of Embodiments 1-3. The difference between this example and Embodiments 1-2 is that the seventh auxiliary spacer element P7b is not provided, and the abutting and contacting methods of the remaining spacer elements are the same as those in Embodiments 1-2. For relevant descriptions, reference can be made to Embodiments 1-2, and details will not be elaborated here.

[0107] In summary, the structural parameters of the optical imaging device of Embodiment 1 under Embodiments 1-1, 1-2, and 1-3 are shown in Table 2 (unit: mm).

[0108] Table 2

[0109]

[0110]

[0111] In Embodiment 1, the object side surface S1 of the first lens is a convex surface, and the image side surface S2 of the first lens is a concave surface. The object side surface S3 of the second lens is a convex surface, and the image side surface S4 of the second lens is a convex surface. The object side surface S5 of the third lens is a convex surface, and the image side surface S6 of the third lens is a concave surface. The object side surface S7 of the fourth lens is a convex surface, and the image side surface S8 of the fourth lens is a concave surface. The object side surface S9 of the fifth lens is a convex surface, and the image side surface S10 of the fifth lens is a convex surface. The object side surface S11 of the sixth lens is a concave surface, and the image side surface S12 of the sixth lens is a convex surface. The object side surface S13 of the seventh lens is a convex surface, and the image side surface S14 of the seventh lens is a concave surface. The object side surface S15 of the eighth lens is a convex surface, and the image side surface S16 of the eighth lens is a concave surface.

[0112] In Embodiment 1, the effective focal length f of the optical imaging device is 5.39 mm, the effective focal length f1 of the first lens is 24.10 mm, the effective focal length f2 of the second lens is 5.67 mm, the effective focal length f3 of the third lens is -8.37 mm, the effective focal length f4 of the fourth lens is -21.75 mm, the effective focal length f5 of the fifth lens is 8.01 mm, the effective focal length f6 of the sixth lens is -9.02 mm, the effective focal length f7 of the seventh lens is 4.84 mm, and the effective focal length f8 of the eighth lens is -4.77 mm.

[0113] Table 3 shows the basic structural parameter table of the optical imaging device of Embodiment 1. Among them, the unit of the radius of curvature and thickness / distance is millimeter (mm). In the following table, OBJ (not shown in the figure) is the object distance. STO (not shown in the figure) is the aperture stop, and the aperture stop is located on the object side of the first lens E1. S17 and S18 (not shown in the figure) can be the object side surface and image side surface of the filter or the object side surface and image side surface of the protective glass. S19 (not shown in the figure) is the imaging surface.

[0114] Table 3

[0115]

[0116]

[0117] In Embodiment 1, the object side and the image side of the first lens E1 to the eighth lens E8 are both aspherical surfaces. The surface profiles of the aspherical lenses can be defined by, but not limited to, the following aspherical formula:

[0118]

[0119] Where x is the sagitta, the distance from the vertex of the aspherical surface when the aspherical surface is at a position with a height of h along the optical axis direction; c is the paraxial curvature of the aspherical surface, c = 1 / R, that is, the paraxial curvature c is the reciprocal of the radius of curvature R in Table 3 above; k is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspherical surface. Table 4 below gives the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each of the aspherical mirrors S1 - S16 in Embodiment 1.

[0120] Table 4

[0121]

[0122]

[0123] Figure 5 Shows the longitudinal chromatic aberration curve of the optical imaging device of Embodiment 1, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging device. Figure 6 Shows the axial chromatic aberration curve of the optical imaging device of Embodiment 1, which represents the deviation of the convergence points of light rays with different wavelengths after passing through the imaging lens. Figure 7 Shows the astigmatism curve of the optical imaging device of Embodiment 1, which represents the curvature of the meridional image plane and the sagittal image plane. Figure 8 Shows the distortion curve of the optical imaging device of Embodiment 1, which represents the distortion values corresponding to different image heights.

[0124] According to Figures 5 to 8 It can be seen that the optical imaging device given in Embodiment 1 can achieve good imaging quality.

[0125] Embodiment 2

[0126] As Figures 9 to 15 shown, the optical imaging device of Embodiment 2 is described. Figure 9 Shows the structural schematic diagram of the optical imaging device of Embodiment 2-1, Figure 10 Shows the structural schematic diagram of the optical imaging device of Embodiment 2-2, Figure 11 Shows the structural schematic diagram of the optical imaging device of Embodiment 2-3.

[0127] As shown Figures 9 to 11 in FIG. 1, the optical imaging device includes a lens barrel P0 and a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fifth lens E5, a fifth spacer P5, a sixth lens E6, a sixth spacer P6, a seventh lens E7, a seventh spacer P7, an eighth lens E8, and an eighth spacer P8, which are sequentially arranged along the optical axis from the object side to the image side in the lens barrel P0.

[0128] As shown Figure 9 in FIG. 2, it is a schematic structural diagram of the optical imaging device of Embodiment 2-1. In this example, the object side surface and the image side surface of the first spacer P1 are partially in 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 P2 are partially in 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 P3 are partially in 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 P4 are partially in 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 P5 are partially in 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 P6 are partially in 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 P7 are partially in contact with the image side surface S14 of the seventh lens and the object side surface S15 of the eighth lens, respectively. The object side surface of the eighth spacer P8 is partially in contact with the image side surface S16 of the eighth lens.

[0129] As shown Figure 10 in FIG. 3, it is a schematic structural diagram of the optical imaging device of Embodiment 2-2. The difference between this example and Embodiment 2-1 is that a third auxiliary spacer P3b is further provided on the image side of the third spacer P3, and a sixth auxiliary spacer P6b and a sixth sub-auxiliary spacer P6c are sequentially provided on the image side of the sixth spacer P6. At this time, the object side surface and the image side surface of the third auxiliary spacer P3b are partially in contact with the image side surface of the third spacer P3 and the object side surface S7 of the fourth lens, respectively. The object side surface and the image side surface of the sixth auxiliary spacer P6b are partially in contact with the image side surface of the sixth spacer P6 and the object side surface of the sixth sub-auxiliary spacer P6c, respectively, and the image side surface of the sixth sub-auxiliary spacer P6c is partially in contact with the object side surface S13 of the seventh lens. The contact and abutment methods of the remaining spacers are the same as those in Embodiment 2-1, and reference can be made to the relevant descriptions in Embodiment 2-1, which will not be elaborated here.

[0130] As shown Figure 11As shown, it is a schematic structural diagram of the optical imaging device of Embodiment 2-3. The difference between this example and Embodiment 2-2 is that the sixth auxiliary spacer element P6c is not provided, and the abutting and contacting methods of the remaining spacer elements are the same as those in Embodiment 2-2. For relevant descriptions, reference can be made to Embodiment 2-2, and details will not be elaborated here.

[0131] In summary, the structural parameters of the optical imaging device in Embodiment 2 under Embodiments 2-1, 2-2, and 2-3 are shown in Table 5 below (unit: mm).

[0132] Table 5

[0133]

[0134]

[0135] In Embodiment 2, the object side surface S1 of the first lens is a convex surface, and the image side surface S2 of the first lens is a concave surface. The object side surface S3 of the second lens is a convex surface, and the image side surface S4 of the second lens is a concave surface. The object side surface S5 of the third lens is a convex surface, and the image side surface S6 of the third lens is a concave surface. The object side surface S7 of the fourth lens is a convex surface, and the image side surface S8 of the fourth lens is a concave surface. The object side surface S9 of the fifth lens is a convex surface, and the image side surface S10 of the fifth lens is a convex surface. The object side surface S11 of the sixth lens is a concave surface, and the image side surface S12 of the sixth lens is a convex surface. The object side surface S13 of the seventh lens is a convex surface, and the image side surface S14 of the seventh lens is a concave surface. The object side surface S15 of the eighth lens is a concave surface, and the image side surface S16 of the eighth lens is a concave surface.

[0136] In Embodiment 2, the effective focal length f of the optical imaging device is 5.37 mm, the effective focal length f1 of the first lens is 16.93 mm, the effective focal length f2 of the second lens is 7.13 mm, the effective focal length f3 of the third lens is -8.76 mm, the effective focal length f4 of the fourth lens is -41.19 mm, the effective focal length f5 of the fifth lens is 7.22 mm, the effective focal length f6 of the sixth lens is -8.88 mm, the effective focal length f7 of the seventh lens is 5.21 mm, and the effective focal length f8 of the eighth lens is -4.63 mm.

[0137] Table 6 shows the basic structural parameter table of the optical imaging device in Embodiment 2. Among them, the unit of the radius of curvature and the thickness / distance is millimeter (mm). In the following table, OBJ (not shown in the figure) is the object distance. STO (not shown in the figure) is the aperture stop, and the aperture stop is located on the object side of the first lens E1. S17 and S18 (not shown in the figure) can be the object side surface and the image side surface of the filter or the object side surface and the image side surface of the protective glass. S19 (not shown in the figure) is the imaging surface.

[0138] Table 6

[0139]

[0140] Table 7 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 of each aspherical mirror S1 - S16 in Example 2. Among them, the surface shape of each aspherical lens is defined according to formula (1) in Example 1.

[0141] Table 7

[0142]

[0143] Figure 12 The longitudinal chromatic aberration curve of the optical imaging device of Example 2 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging device. Figure 13 The axial chromatic aberration curve of the optical imaging device of Example 2 is shown, which represents the deviation of the convergence points of light rays with different wavelengths after passing through the imaging lens. Figure 14 The astigmatism curve of the optical imaging device of Example 2 is shown, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 15 The distortion curve of the optical imaging device of Example 2 is shown, which represents the distortion magnitude values corresponding to different image heights.

[0144] According to Figures 12 to 15 it can be seen that the optical imaging device given in Example 2 can achieve good imaging quality.

[0145] Example 3

[0146] As Figures 16 to 22 shown, the optical imaging device of Example 3 is described. Figure 16 The structural schematic diagram of the optical imaging device of Example 3 - 1 is shown, Figure 17 The structural schematic diagram of the optical imaging device of Example 3 - 2 is shown, Figure 18 The structural schematic diagram of the optical imaging device of Example 3 - 3 is shown.

[0147] As Figures 16 to 18 shown, the optical imaging device includes a lens barrel P0 and a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fifth lens E5, a fifth spacer P5, a sixth lens E6, a sixth spacer P6, a seventh lens E7, a seventh spacer P7, an eighth lens E8, and an eighth spacer P8, which are sequentially arranged from the object side to the image side along the optical axis in the lens barrel P0.

[0148] As Figure 16As shown in the figure, it is a schematic structural diagram of the optical imaging device of Embodiment 3-1. In this example, the object side and the image side of the first spacer element P1 are respectively in partial contact with the image side S2 of the first lens and the object side S3 of the second lens. The object side and the image side of the second spacer element P2 are respectively in partial contact with the image side S4 of the second lens and the object side S5 of the third lens. The object side and the image side of the third spacer element P3 are respectively in partial contact with the image side S6 of the third lens and the object side S7 of the fourth lens. The object side and the image side of the fourth spacer element P4 are respectively in partial contact with the image side S8 of the fourth lens and the object side S9 of the fifth lens. The object side and the image side of the fifth spacer element P5 are respectively in partial contact with the image side S10 of the fifth lens and the object side S11 of the sixth lens. The object side and the image side of the sixth spacer element P6 are respectively in partial contact with the image side S12 of the sixth lens and the object side S13 of the seventh lens. The object side and the image side of the seventh spacer element P7 are respectively in partial contact with the image side S14 of the seventh lens and the object side S15 of the eighth lens. The object side of the eighth spacer element P8 is in partial contact with the image side S16 of the eighth lens.

[0149] As Figure 17 shown, it is a schematic structural diagram of the optical imaging device of Embodiment 3-2. The difference between this example and Embodiment 3-1 is that a third auxiliary spacer element P3b is further provided on the image side of the third spacer element P3, and a sixth auxiliary spacer element P6b and a sixth secondary auxiliary spacer element P6c are sequentially provided on the image side of the sixth spacer element P6. At this time, the object side and the image side of the third auxiliary spacer element P3b are respectively in partial contact with the image side of the third spacer element P3 and the object side S7 of the fourth lens. The object side and the image side of the sixth auxiliary spacer element P6b are respectively in partial contact with the image side of the sixth spacer element P6 and the object side of the sixth secondary auxiliary spacer element P6c, and the image side of the sixth secondary auxiliary spacer element P6c is in partial contact with the object side S13 of the seventh lens. The contact and abutment manners of the remaining spacer elements are the same as those in Embodiment 3-1, and reference can be made to the relevant descriptions in Embodiment 3-1, which will not be elaborated here.

[0150] As Figure 18 shown, it is a schematic structural diagram of the optical imaging device of Embodiment 3-3. The difference between this example and Embodiment 3-2 is that the sixth secondary auxiliary spacer element P6c is not provided, and the contact and abutment manners of the remaining spacer elements are the same as those in Embodiment 3-2, and reference can be made to the relevant descriptions in Embodiment 3-2, which will not be elaborated here.

[0151] In summary, the structural parameters of the optical imaging device in Embodiment 3 under Embodiments 3-1, 3-2, and 3-3 are shown in Table 8 (unit: mm).

[0152] Table 8

[0153]

[0154]

[0155] In Embodiment 3, the object side surface S1 of the first lens is a convex surface, and the image side surface S2 of the first lens is a concave surface. The object side surface S3 of the second lens is a convex surface, and the image side surface S4 of the second lens is a convex surface. The object side surface S5 of the third lens is a convex surface, and the image side surface S6 of the third lens is a concave surface. The object side surface S7 of the fourth lens is a convex surface, and the image side surface S8 of the fourth lens is a concave surface. The object side surface S9 of the fifth lens is a convex surface, and the image side surface S10 of the fifth lens is a convex surface. The object side surface S11 of the sixth lens is a concave surface, and the image side surface S12 of the sixth lens is a convex surface. The object side surface S13 of the seventh lens is a convex surface, and the image side surface S14 of the seventh lens is a concave surface. The object side surface S15 of the eighth lens is a concave surface, and the image side surface S16 of the eighth lens is a concave surface.

[0156] In Embodiment 3, the effective focal length f of the optical imaging device is 5.61 mm, the effective focal length f1 of the first lens is 18.69 mm, the effective focal length f2 of the second lens is 5.86 mm, the effective focal length f3 of the third lens is -7.26 mm, the effective focal length f4 of the fourth lens is -28.37 mm, the effective focal length f5 of the fifth lens is 6.85 mm, the effective focal length f6 of the sixth lens is -8.51 mm, the effective focal length f7 of the seventh lens is 5.91 mm, and the effective focal length f8 of the eighth lens is -4.52 mm.

[0157] Table 9 shows the basic structural parameter table of the optical imaging device in Embodiment 3, where the units of the radius of curvature and the thickness / distance are both millimeters (mm). In the following table, OBJ (not shown in the figure) is the object distance. STO (not shown in the figure) is the aperture stop, and the aperture stop is located on the object side of the first lens E1. S17 and S18 (not shown in the figure) can be the object side surface and the image side surface of the filter or the object side surface and the image side surface of the protective glass. S19 (not shown in the figure) is the imaging surface.

[0158] Table 9

[0159]

[0160]

[0161] Table 10 below gives the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical mirror surface S1 - S16 in Embodiment 3. Among them, the surface shape of each aspherical lens is defined according to formula (1) in Embodiment 1.

[0162] Table 10

[0163]

[0164]

[0165] Figure 19 Shows the longitudinal chromatic aberration curve of the optical imaging device of Embodiment 3, which represents the deviation of different image heights on the imaging plane after light passes through the optical imaging device. Figure 20 Shows the axial chromatic aberration curve of the optical imaging device of Embodiment 3, which represents the deviation of the convergence points of light rays with different wavelengths after passing through the imaging lens. Figure 21 Shows the astigmatism curve of the optical imaging device of Embodiment 3, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 22 Shows the distortion curve of the optical imaging device of Embodiment 3, which represents the distortion magnitude values corresponding to different image heights.

[0166] According to Figures 19 to 22 it can be known that the optical imaging device given in Embodiment 3 can achieve good imaging quality.

[0167] In summary, Embodiments 1 to 3 respectively satisfy the relationships shown in Table 11.

[0168] Table 11

[0169] Conditional formula / Example 1-1 1-2 1-3 2-1 2-2 2-3 3-1 3-2 3-3 L / ∑CP 9.66 5.19 5.73 9.98 6.39 5.64 10.92 6.20 5.23 R11 / R12 × V6 13.76 13.76 13.76 14.85 14.85 14.85 15.93 15.93 15.93 (EP56 + ∑CP6) / CT6 2.68 2.90 3.05 3.38 3.80 3.88 3.45 3.90 3.80 (d3m + D3m) / R7 1.28 1.54 1.56 1.36 1.63 1.62 0.90 1.11 1.10 d8s / (R15 + R16) 0.33 0.33 0.33 1.25 1.25 1.13 -1.90 -1.87 -1.69 EP23 / EP34 1.42 0.90 1.13 1.38 0.64 1.09 1.28 0.88 1.11 (D7m - d8s) / CT8 1.34 0.12 1.07 1.28 1.08 1.10 1.08 1.22 1.22 (L - ∑AT) / T34 9.87 9.73 9.08 10.33 10.43 10.41 8.65 8.74 8.44 (D6m - d6m) / R13 1.33 0.17 0.17 1.52 1.48 0.37 1.59 1.61 0.38 (D0s - d1s) / CT1 6.78 7.77 7.45 7.95 7.67 7.95 7.78 7.52 7.75 |f6| / (EP56 + CT6) 6.22 8.06 7.64 5.19 5.84 6.25 4.89 5.56 6.04 f2 × N2 / d2m 3.08 3.04 2.88 4.43 4.41 4.48 3.48 3.46 3.49 ∑EP / EP12 12.39 10.49 11.58 12.79 13.27 11.73 12.70 12.80 10.87 R14 / d7s 1.70 1.48 1.71 1.45 1.45 1.46 0.94 0.93 0.94 R10 × N5 / D5m -2.33 -2.47 -2.43 -1.79 -1.80 -1.98 -1.68 -1.68 -1.74 (EP78 + CP8) / CT8 2.71 2.27 2.36 2.37 2.20 2.04 2.30 2.18 2.17 EP56 / CT6 × R11 -8.54 -5.86 -6.35 -9.58 -8.19 -7.46 -8.52 -7.19 -6.42

[0170] Table 12 shows parameters such as the effective focal length of the optical imaging devices of Embodiments 1 to 3 and the effective focal lengths of each lens.

[0171] Table 12

[0172] Basic data / Example One Two Three f (mm) 5.39 5.37 5.61 f1 (mm) 24.10 16.93 18.69 f2 (mm) 5.67 7.13 5.86 f3 (mm) -8.37 -8.76 -7.26 f4 (mm) -21.75 -41.19 -28.37 f5 (mm) 8.01 7.22 6.85 f6 (mm) -9.02 -8.88 -8.51 f7 (mm) 4.84 5.21 5.91 f8 (mm) -4.77 -4.63 -4.52

[0173] This application also provides an imaging device, and its electronic photosensitive element can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor element (CMOS). The imaging device can be an independent imaging device 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 imaging device described above.

[0174] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0175] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0176] It should be noted that the terms "first", "second", etc. in the description and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0177] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An optical imaging device, characterized in that: The invention comprises a lens barrel and a lens group and a spacer element group arranged in the lens barrel, The lens group is composed of eight lenses, and the eight lenses are, from the object side to the image side, a first lens with positive optical power, a second lens with optical power, a third lens with optical power, a fourth lens with negative optical power, a fifth lens with optical power, a sixth lens with optical power, a seventh lens with optical power, and an eighth lens with negative optical power; the object side surface of the first lens is a convex surface, the image side surface of the fifth lens is a convex surface, the object side surface of the sixth lens is a concave surface, the image side surface of the sixth lens is a convex surface, and the image side surface of the eighth lens is a concave surface; two adjacent lenses from the first lens to the eighth lens have an air gap on the optical axis of the optical imaging device; The spacer element group includes a first spacer element disposed between the first lens and the second lens and partially supported by the image side surface of the first lens, a second spacer element disposed between the second lens and the third lens and partially supported by the image side surface of the second lens, a third spacer element disposed between the third lens and the fourth lens and partially supported by the image side surface of the third lens, a fourth spacer element disposed between the fourth lens and the fifth lens and partially supported by the image side surface of the fourth lens, a fifth spacer element disposed between the fifth lens and the sixth lens and partially supported by the image side surface of the fifth lens, a sixth spacer element disposed between the sixth lens and the seventh lens and partially supported by the image side surface of the sixth lens, a seventh spacer element disposed between the seventh lens and the eighth lens and partially supported by the image side surface of the seventh lens, and an eighth spacer element disposed on the image side of the eighth lens and partially supported by the image side surface of the eighth lens; The maximum axial height L of the lens barrel and the sum of the axial thicknesses ∑CP of all the spacer elements of the optical imaging device satisfy the following relationship: 5.19≤L / ∑CP≤10.92; the radius of curvature R11 of the object side surface of the sixth lens, the radius of curvature R12 of the image side surface of the sixth lens and the Abbe number V6 of the sixth lens satisfy the following relationship: 13.76≤R11 / R12×V6≤15.93; the spacing distance EP56 from the image side surface of the fifth spacer element to the object side surface of the sixth spacer element on the optical axis, the sum of the axial thicknesses ∑CP6 of all the spacer elements between the sixth lens and the seventh lens and the center thickness CT6 of the sixth lens on the optical axis satisfy the following relationship: 2.68≤(EP56+∑CP6) / CT6≤3.

90.

2. The optical imaging device according to claim 1, characterized in that: The object side surface of the fourth lens is convex, and the inner diameter d3m of the image side surface of the third spacing element, the outer diameter D3m of the image side surface of the third spacing element and the curvature radius R7 of the object side surface of the fourth lens satisfy: 0.90≤(d3m+D3m) / R7≤1.

63.

3. The optical imaging device according to claim 1, characterized in that: The inner diameter d8s of the object side surface of the eighth spacer element, the curvature radius R15 of the object side surface of the eighth lens and the curvature radius R16 of the image side surface of the eighth lens satisfy: -1.90≤d8s / (R15+R16)≤1.

25.

4. The optical imaging device according to claim 1, characterized in that: A spacing distance EP23 from the image side surface of the second spacing element to the object side surface of the third spacing element on the optical axis and a spacing distance EP34 from the image side surface of the third spacing element to the object side surface of the fourth spacing element on the optical axis satisfy: 0.64≤EP23 / EP34≤1.

42.

5. The optical imaging device according to claim 1, characterized in that: An outer diameter D7m of the image side surface of the seventh spacer element, an inner diameter d8s of the object side surface of the eighth spacer element, and a center thickness CT8 of the eighth lens on the optical axis satisfy the following: 0.12≤(D7m-d8s) / CT8≤1.

34.

6. The optical imaging device according to claim 1, characterized in that: The maximum axial height L of the lens barrel, the sum ΣAT of the air gaps between two adjacent lenses of the first lens to the eighth lens on the optical axis, and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy: 8.44≤(L-ΣAT) / T34≤10.

43.

7. The optical imaging device according to claim 1, characterized in that: The object side surface of the seventh lens is a convex surface, and the outer diameter D6m of the image side surface of the sixth spacing element, the inner diameter d6m of the image side surface of the sixth spacing element and the curvature radius R13 of the object side surface of the seventh lens satisfy: 0.17≤(D6m-d6m) / R13≤1.

61.

8. The optical imaging device according to claim 1, characterized in that: The outer diameter D0s of the object side end surface of the lens barrel, the inner diameter d1s of the object side surface of the first spacer element, and the center thickness CT1 of the first lens on the optical axis satisfy the following: 6.78≤(D0s-d1s) / CT1≤7.

95.

9. The optical imaging device according to claim 1, characterized in that: The sixth lens has negative optical power, and the effective focal length f6 of the sixth lens, the spacing distance EP56 from the image side surface of the fifth spacing element to the object side surface of the sixth spacing element on the optical axis and the center thickness CT6 of the sixth lens on the optical axis satisfy: 4.89≤|f6| / (EP56+CT6)≤8.

06.

10. The optical imaging device according to claim 1, characterized in that: The second lens has positive refractive power, and an effective focal length f2 of the second lens, a refractive index N2 of the second lens, and an inner diameter d2m of the image side surface of the second spacer element satisfy the following relationship: 2.88≤f2×N2 / d2m≤4.48.

Images