Optical imaging system

Abstract

The present invention provides an optical imaging system, which includes a first lens group and a second lens group. The first lens group has a positive optical power, and the second lens group has a positive optical power. The first lens group includes: a first lens, which has a positive optical power; a second lens, which has a negative optical power; a third lens, which has a positive optical power. The second lens group includes: a fourth lens, which has a negative optical power; a fifth lens, which has a positive optical power; a sixth lens, which has a negative optical power. Wherein, when the object to be photographed moves closer to the optical imaging system, the position of the second lens group on the optical axis of the optical imaging system is moved to achieve focus adjustment. The effective focal length F1 of the first lens group and the on-axis distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging system satisfy: 0.8 < TTL / F1 < 1.0. The present invention solves the problem that it is difficult to ensure the imaging quality of the optical imaging system at different object distances in the prior art.

Description

Technical Field

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

[0002] With the rapid development of technology, users have higher and higher requirements for the diversity of mobile phone functions. In particular, the scenarios of using mobile phones to take pictures are becoming more and more diverse. For the optical imaging system installed on the mobile phone, it is required to cooperate with focusing at different shooting distances. For the existing in-focus optical imaging system, there are large aberrations at different object distances, making it difficult to ensure high imaging quality and unable to meet the needs of users.

[0003] That is to say, in the prior art, there is a problem that it is difficult to ensure the imaging quality of the optical imaging system at different object distances. Summary of the Invention

[0004] The main object of the present invention is to provide an optical imaging system to solve the problem that it is difficult to ensure the imaging quality of the optical imaging system at different object distances in the prior art.

[0005] To achieve the above object, according to one aspect of the present invention, there is provided an optical imaging system. The optical imaging system sequentially includes a first lens group and a second lens group from the object side to the image side. The first lens group has a positive optical power, and the second lens group has a positive optical power. The first lens group includes: a first lens having a positive optical power; a second lens having a negative optical power; a third lens having a positive optical power. The second lens group includes: a fourth lens having a negative optical power; a fifth lens having a positive optical power; a sixth lens having a negative optical power. Wherein, when the object to be photographed moves closer to the optical imaging system, the position of the second lens group on the optical axis of the optical imaging system is moved to achieve focusing adjustment. The effective focal length F1 of the first lens group and the on-axis distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging system satisfy: 0.8 < TTL / F1 < 1.0.

[0006] Furthermore, the difference △f between the effective focal lengths of the optical imaging system at the telephoto position and the close-up position, and the difference △T between the air gaps on the optical axis of the first lens group and the second lens group of the optical imaging system at the telephoto position and the close-up position satisfy: 0.15 < |△f| / |△T| ≤ 0.30.

[0007] Furthermore, the effective focal length F1 of the first lens group and the difference △T between the air gaps on the optical axis of the first lens group and the second lens group of the optical imaging system at the telephoto position and the close-up position satisfy: 4.5 < F1 / (|△T|*10) < 7.0.

[0008] Furthermore, the effective focal length f1 of the first lens, and the difference △T between the air spaces on the optical axis of the first lens group and the second lens group when the optical imaging system is at the telephoto position and the close-up position satisfy: 5.0 < f1 / (|△T| * 10) < 7.0.

[0009] Furthermore, the effective focal length F1 of the first lens group, and the distance Td1 on the optical axis from the object side surface of the first lens to the image side surface of the third lens satisfy: 3.0 < F1 / Td1 < 4.0.

[0010] Furthermore, the effective focal length F2 of the second lens group, and the distance Td2 on the optical axis from the object side surface of the fourth lens to the image side surface of the sixth lens satisfy: 3.0 < F2 / Td2 < 5.5.

[0011] Furthermore, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the effective focal length f3 of the third lens satisfy: -2.5 < (f1 + f3) / f2 < -1.5.

[0012] Furthermore, the central thickness CT1 of the first lens, and the air space T12 on the optical axis between the first lens and the second lens satisfy: 0.8 < CT1 / T12 < 1.5.

[0013] Furthermore, the air space T12 on the optical axis between the first lens and the second lens, and the central thickness CT2 of the second lens satisfy: 1.2 < T12 / CT2 ≤ 1.8.

[0014] Furthermore, the effective focal length F1 of the first lens group, the central thickness CT1 of the first lens, and the central thickness CT3 of the third lens satisfy: 5.5 < F1 / (CT1 + CT3) < 7.0.

[0015] Furthermore, the radius of curvature R9 of the object side surface of the fifth lens, the radius of curvature R10 of the image side surface of the fifth lens, and the central thickness CT5 of the fifth lens satisfy: 3.5 < (R9 - R10) / CT5 < 10.0.

[0016] Furthermore, the radius of curvature R9 of the object side surface of the fifth lens, the radius of curvature R10 of the image side surface of the fifth lens, and the central thickness CT5 of the fifth lens satisfy: 3.5 < (R9 - R10) / CT5 ≤ 6.0.

[0017] Furthermore, the radius of curvature R12 of the image side surface of the sixth lens, and the central thickness CT6 of the sixth lens satisfy; 1.5 < R12 / CT6 < 3.5.

[0018] Further, the following conditions are satisfied among the radius of curvature R10 of the image side of the fifth lens, the radius of curvature R11 of the object side of the sixth lens, the effective focal length f5 of the fifth lens, and the effective focal length f6 of the sixth lens: -3.0 < f5 / R10 + f6 / R11 ≤ -2.0.

[0019] Further, the following conditions are satisfied among the central thickness CT3 of the third lens, the central thickness CT4 of the fourth lens, and the sum ∑ATi of the air spaces on the optical axis between any two adjacent lenses among the first lens to the sixth lens when the optical imaging system is in the telephoto position: 0.7 ≤ (CT3 + CT4) / ∑ATi ≤ 0.9.

[0020] According to another aspect of the present invention, an optical imaging system is provided. The optical imaging system sequentially includes a first lens group and a second lens group from the object side to the image side. The first lens group has a positive optical power, and the second lens group has a positive optical power. The first lens group includes: a first lens having a positive optical power; a second lens having a negative optical power; a third lens having a positive optical power. The second lens group includes: a fourth lens having a negative optical power; a fifth lens having a positive optical power; a sixth lens having a negative optical power. Among them, when the object to be photographed moves closer to the optical imaging system, the position of the second lens group on the optical axis of the optical imaging system is moved to achieve focus adjustment. The following conditions are satisfied between the difference △f in the effective focal lengths of the optical imaging system in the telephoto position and the close-up position and the difference △T in the air spaces on the optical axis between the first lens group and the second lens group in the telephoto position and the close-up position: 0.15 < |△f| / |△T| ≤ 0.30.

[0021] Further, the following conditions are satisfied between the effective focal length F1 of the first lens group and the difference △T in the air spaces on the optical axis between the first lens group and the second lens group in the telephoto position and the close-up position of the optical imaging system: 4.5 < F1 / (|△T| * 10) < 7.0.

[0022] Further, the following conditions are satisfied between the effective focal length f1 of the first lens and the difference △T in the air spaces on the optical axis between the first lens group and the second lens group in the telephoto position and the close-up position of the optical imaging system: 5.0 < f1 / (|△T| * 10) < 7.0.

[0023] Further, the following conditions are satisfied between the effective focal length F1 of the first lens group and the distance Td1 on the optical axis from the object side of the first lens to the image side of the third lens: 3.0 < F1 / Td1 < 4.0.

[0024] Further, the following conditions are satisfied between the effective focal length F2 of the second lens group and the distance Td2 on the optical axis from the object side of the fourth lens to the image side of the sixth lens: 3.0 < F2 / Td2 < 5.5.

[0025] Furthermore, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the effective focal length f3 of the third lens satisfy: -2.5 < (f1 + f3) / f2 < -1.5.

[0026] Furthermore, the central thickness CT1 of the first lens and the air gap T12 on the optical axis between the first lens and the second lens satisfy: 0.8 < CT1 / T12 < 1.5.

[0027] Furthermore, the air gap T12 on the optical axis between the first lens and the second lens and the central thickness CT2 of the second lens satisfy: 1.2 < T12 / CT2 ≤ 1.8.

[0028] Furthermore, the effective focal length F1 of the first lens group, the central thickness CT1 of the first lens, and the central thickness CT3 of the third lens satisfy: 5.5 < F1 / (CT1 + CT3) < 7.0.

[0029] Furthermore, the radius of curvature R9 of the object side of the fifth lens, the radius of curvature R10 of the image side of the fifth lens, and the central thickness CT5 of the fifth lens satisfy: 3.5 < (R9 - R10) / CT5 < 10.0.

[0030] Furthermore, the radius of curvature R9 of the object side of the fifth lens, the radius of curvature R10 of the image side of the fifth lens, and the central thickness CT5 of the fifth lens satisfy: 3.5 < (R9 - R10) / CT5 ≤ 6.0.

[0031] Furthermore, the radius of curvature R12 of the image side of the sixth lens and the central thickness CT6 of the sixth lens satisfy; 1.5 < R12 / CT6 < 3.5.

[0032] Furthermore, the radius of curvature R10 of the image side of the fifth lens, the radius of curvature R11 of the object side of the sixth lens, the effective focal length f5 of the fifth lens, and the effective focal length f6 of the sixth lens satisfy: -3.0 < f5 / R10 + f6 / R11 ≤ -2.0.

[0033] Furthermore, the central thickness CT3 of the third lens, the central thickness CT4 of the fourth lens, and the sum ∑ATi of the air gaps on the optical axis between any two adjacent lenses among the first lens to the sixth lens satisfy: 0.7 ≤ (CT3 + CT4) / ∑ATi ≤ 0.9.

[0034] Applying the technical solution of the present invention, the optical imaging system sequentially includes a first lens group and a second lens group from the object side to the image side. The first lens group has a positive optical power, and the second lens group has a positive optical power. The first lens group includes a first lens, a second lens, and a third lens. The first lens has a positive optical power; the second lens has a negative optical power; the third lens has a positive optical power; the second lens group includes a fourth lens, a fifth lens, and a sixth lens. The fourth lens has a negative optical power; the fifth lens has a positive optical power; the sixth lens has a negative optical power; wherein, when the object to be photographed moves closer to the optical imaging system, the position of the second lens group on the optical axis of the optical imaging system is moved to achieve focus adjustment; the effective focal length F1 of the first lens group and the on-axis distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging system satisfy: 0.8 < TTL / F1 < 1.0.

[0035] The second lens group is arranged to be movable on the optical axis, which can adjust the focal length of the optical imaging system to cooperate with different object distances for clear imaging. Alternately setting the positive and negative of the optical powers of each lens is beneficial to correcting aberration and improving imaging quality. By limiting TTL / F1 within a reasonable range, the effective focal length of the first lens group can be reasonably allocated, so that the effective focal length of the optical imaging system changes reasonably when photographing at different object distances, and the imaging performance of the optical imaging system in different photographing object distance situations is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] 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:

[0037] Figure 1 shows a schematic structural diagram of the optical imaging system of Example 1 of the present invention;

[0038] Figures 2 to 4 respectively show Figure 1 the axial chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging system in the near-shot position in;

[0039] Figures 5 to 7 respectively show Figure 1 the axial chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging system in the far-shot position in;

[0040] Figure 8 shows a schematic structural diagram of the optical imaging system of Example 2 of the present invention;

[0041] Figures 9 to 11 respectively show Figure 8 the axial chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging system in the near-shot position in;

[0042] Figures 12 to 14 respectively show Figure 8 the axial chromatic aberration curve, astigmatism curve and distortion curve of the optical imaging system in

[0043] Figure 15 the structural schematic diagram of the optical imaging system of Example 3 of the present invention;

[0044] Figures 16 to 18 respectively show Figure 15 the axial chromatic aberration curve, astigmatism curve and distortion curve of the optical imaging system in

[0045] Figures 19 to 21 respectively show Figure 15 the axial chromatic aberration curve, astigmatism curve and distortion curve of the optical imaging system in

[0046] Figure 22 the structural schematic diagram of the optical imaging system of Example 4 of the present invention;

[0047] Figures 23 to 25 respectively show Figure 22 the axial chromatic aberration curve, astigmatism curve and distortion curve of the optical imaging system in

[0048] Figures 26 to 28 respectively show Figure 22 the axial chromatic aberration curve, astigmatism curve and distortion curve of the optical imaging system in

[0049] Figure 29 the structural schematic diagram of the optical imaging system of Example 5 of the present invention;

[0050] Figures 30 to 32 respectively show Figure 29 the axial chromatic aberration curve, astigmatism curve and distortion curve of the optical imaging system in

[0051] Figures 33 to 35 respectively show Figure 29 the axial chromatic aberration curve, astigmatism curve and distortion curve of the optical imaging system in

[0052] Figure 36 the structural schematic diagram of the optical imaging system of Example 6 of the present invention;

[0053] Figures 37 to 39 respectively show Figure 36 the axial chromatic aberration curve, astigmatism curve and distortion curve of the optical imaging system in

[0054] Figures 40 to 42 respectively showFigure 36 The axial chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging system in

[0055] Figure 43 Fig. 5 shows a schematic structural diagram of the optical imaging system according to Example 7 of the present invention;

[0056] Figures 44 to 46 respectively show Figure 43 the axial chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging system in

[0057] Figures 47 to 49 respectively show Figure 43 the axial chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging system in

[0058] Among them, the above-mentioned drawings include the following reference numerals:

[0059] G1, the first lens group; G2, the second lens group; STO, the aperture stop; E1, the first lens; S1, the object side surface of the first lens; S2, the image side surface of the first lens; E2, the second lens; S3, the object side surface of the second lens; S4, the image side surface of the second lens; E3, the third lens; S5, the object side surface of the third lens; S6, the image side surface of the third lens; E4, the fourth lens; S7, the object side surface of the fourth lens; S8, the image side surface of the fourth lens; E5, the fifth lens; S9, the object side surface of the fifth lens; S10, the image side surface of the fifth lens; E6, the sixth lens; S11, the object side surface of the sixth lens; S12, the image side surface of the sixth lens; E7, the filter; S13, the object side surface of the filter; S14, the image side surface of the filter; S15, the imaging surface. Detailed Embodiments

[0060] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may 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.

[0061] 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.

[0062] In the present invention, unless otherwise stated, the orientation terms such as "upper, lower, top, bottom" are usually 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.

[0063] 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.

[0064] In the drawings, for the sake of clarity, the thickness, dimensions, and shapes of the lenses 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 for illustrative purposes only and are not drawn to an exact scale.

[0065] In this context, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not 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 surface of each lens closer to the object side is the object side surface of the lens, and the surface of each lens closer to the image side is called the image side surface of the lens. 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 positive or negative 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. For the object side surface, when the R value is positive, it is judged to be convex, and when the R value is negative, it is judged to be concave; for the image side surface, when the R value is positive, it is judged to be concave, and when the R value is negative, it is judged to be convex.

[0066] To solve the problem that it is difficult to guarantee the imaging quality of an optical imaging system at different object distances in the prior art, the present invention provides an optical imaging system.

[0067] Embodiment 1

[0068] As Figures 1 to 49 shown, the optical imaging system sequentially includes a first lens group and a second lens group from the object side to the image side. The first lens group has a positive focal power, and the second lens group has a positive focal power. The first lens group includes a first lens, a second lens, and a third lens. The first lens has a positive focal power; the second lens has a negative focal power; the third lens has a positive focal power; the second lens group includes a fourth lens, a fifth lens, and a sixth lens. The fourth lens has a negative focal power; the fifth lens has a positive focal power; the sixth lens has a negative focal power; wherein, when the object to be photographed moves closer to the optical imaging system, the position of the second lens group on the optical axis of the optical imaging system is moved to achieve focus adjustment; the effective focal length F1 of the first lens group and the on-axis distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging system satisfy: 0.8 < TTL / F1 < 1.0.

[0069] The second lens group is set to be movable on the optical axis, capable of adjusting the focal length of the optical imaging system to achieve clear imaging in cooperation with different object distances. Alternating the positive and negative signs of the optical powers of the respective lenses is beneficial for correcting aberrations and improving the imaging quality. By restricting TTL / F1 within a reasonable range, the effective focal length of the first lens group can be reasonably allocated, enabling the effective focal length of the optical imaging system to vary reasonably when shooting at different object distances, and improving the imaging performance of the optical imaging system under different shooting object distances.

[0070] Preferably, the effective focal length F1 of the first lens group and the on-axis distance TTL from the object side of the first lens to the imaging surface of the optical imaging system satisfy: 0.85 ≤ TTL / F1 ≤ 0.92.

[0071] In this embodiment, the difference △f in the effective focal lengths of the optical imaging system between the telephoto position and the close-up position and the difference △T in the air gaps on the optical axis between the first lens group and the second lens group of the optical imaging system between the telephoto position and the close-up position satisfy: 0.15 < |△f| / |△T| ≤ 0.30. By restricting |△f| / |△T| within a reasonable range, the relationship between the change amount of the effective focal length and the change amount of the air gap when the object distance is switched can be constrained, the performance of the optical imaging system at different object distances can be improved, and at the same time, the sensitivity of the second lens group during movement can be reduced. Preferably, 0.18 ≤ |△f| / |△T| ≤ 0.30.

[0072] In this embodiment, the effective focal length F1 of the first lens group and the difference △T in the air gaps on the optical axis between the first lens group and the second lens group of the optical imaging system between the telephoto position and the close-up position satisfy: 4.5 < F1 / (|△T| * 10) < 7.0. By restricting F1 / (|△T| * 10) within a reasonable range, the effective focal length of the first lens group can be reasonably allocated, the sensitivity of the second lens group during movement can be reduced, and at the same time, the basic aberrations such as spherical aberration, coma, astigmatism, field curvature, and distortion generated by the movement of the second lens group can be reduced, improving the imaging quality. Preferably, 4.92 ≤ F1 / (|△T| * 10) ≤ 6.61.

[0073] In this embodiment, the effective focal length f1 of the first lens and the difference △T in the air gaps on the optical axis between the first lens group and the second lens group of the optical imaging system between the telephoto position and the close-up position satisfy: 5.0 < f1 / (|△T| * 10) < 7.0. By restricting f1 / (|△T| * 10) within a reasonable range, the effective focal length of the first lens can be reasonably allocated, the sensitivity of the first lens in the first lens group can be reduced, and the basic imaging aberrations such as spherical aberration, coma, chromatic aberration, and field curvature caused by the first lens can be reduced, improving the imaging performance of the optical imaging system. Preferably, 5.11 ≤ f1 / (|△T| * 10) ≤ 6.70.

[0074] In this embodiment, the effective focal length F1 of the first lens group and the distance Td1 on the optical axis from the object side surface of the first lens to the image side surface of the third lens satisfy: 3.0 < F1 / Td1 < 4.0. By limiting F1 / Td1 within a reasonable range, the aberration generated by the first lens can be improved, the aberration of the optical imaging system can be initially corrected, and the imaging quality can be improved.

[0075] In this embodiment, the effective focal length F2 of the second lens group and the distance Td2 on the optical axis from the object side surface of the fourth lens to the image side surface of the sixth lens satisfy: 3.0 < F2 / Td2 < 5.5. By limiting F2 / Td2 within a reasonable range, the aberration generated by the second lens group can be reduced, and at the same time, it is beneficial to balance the performance of the optical imaging system under different object distance shooting conditions. Preferably, 3.19 ≤ F2 / Td2 ≤ 5.34.

[0076] In this embodiment, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the effective focal length f3 of the third lens satisfy: -2.5 < (f1 + f3) / f2 < -1.5. By limiting (f1 + f3) / f2 within a reasonable range, the effective focal lengths of the lenses in the first lens group can be reasonably allocated, the imaging performance under different object distance shooting conditions can be improved, and at the same time, the sensitivity of the lenses in the first lens group can be reduced. Preferably, -2.20 ≤ (f1 + f3) / f2 ≤ -1.66.

[0077] In this embodiment, the central thickness CT1 of the first lens and the air gap T12 on the optical axis between the first lens and the second lens satisfy: 0.8 < CT1 / T12 < 1.5. By limiting CT1 / T12 within a reasonable range, it is beneficial to reasonably allocate the optical power of the first lens, reduce the aberration generated by the first lens, and at the same time, the sensitivity of the central thickness of the first lens and the sensitivity of the air gap between the first lens and the second lens can be reduced, thereby reducing the sensitivity after the first lens and the second lens are assembled, and improving the yield of the optical imaging system. Preferably, 0.86 ≤ CT1 / T12 ≤ 1.33.

[0078] In this embodiment, the air gap T12 on the optical axis between the first lens and the second lens and the central thickness CT2 of the second lens satisfy: 1.2 < T12 / CT2 ≤ 1.8. By limiting T12 / CT2 within a reasonable range, it is beneficial to reasonably allocate the optical power of the second lens, reduce the sensitivity of the central thickness of the second lens, and at the same time, the correction of spherical aberration and chromatic aberration of the optical imaging system can be achieved, and the optical performance of the system can be improved. Preferably, 1.26 ≤ T12 / CT2 ≤ 1.77.

[0079] In this embodiment, the effective focal length F1 of the first lens group, the central thickness CT1 of the first lens, and the central thickness CT3 of the third lens satisfy: 5.5 < F1 / (CT1 + CT3) < 7.0. By restricting F1 / (CT1 + CT3) within a reasonable range, the effective focal length of the first lens can be reasonably allocated, the imaging performance of the optical imaging system can be improved, and at the same time, the basic aberrations such as spherical aberration, coma, and astigmatism caused by the first lens and the third lens can be reduced. At the same time, it is beneficial to optimize and improve chromatic aberration and reduce the risk of purple fringing. Preferably, 5.74 ≤ F1 / (CT1 + CT3) ≤ 6.89.

[0080] In this embodiment, the curvature radius R9 of the object side surface of the fifth lens, the curvature radius R10 of the image side surface of the fifth lens, and the central thickness CT5 of the fifth lens satisfy: 3.5 < (R9 - R10) / CT5 < 10.0. By restricting (R9 - R10) / CT5 within a reasonable range, it is beneficial to reasonably allocate the optical power of the fifth lens. On the premise that the fifth lens itself cannot correct astigmatism, the aberrations generated by the fifth lens are reduced as much as possible, thereby realizing the optimization and improvement of the comprehensive aberration and improving the imaging quality. Preferably, 3.5 < (R9 - R10) / CT5 ≤ 6.0. Further preferably, 3.96 ≤ (R9 - R10) / CT5 ≤ 9.34.

[0081] In this embodiment, the curvature radius R12 of the image side surface of the sixth lens and the central thickness CT6 of the sixth lens satisfy; 1.5 < R12 / CT6 < 3.5. By restricting R12 / CT6 within a reasonable range, it is beneficial to reasonably allocate the optical power of the sixth lens. Under the condition that the sixth lens has distortion and astigmatism aberrations on one side, the positive and negative corrections of the distortion and astigmatism aberrations on both sides are realized, thereby realizing the correction of the comprehensive aberration and improving the imaging quality. Preferably, 1.81 ≤ R12 / CT6 ≤ 3.12.

[0082] In this embodiment, the curvature radius R10 of the image side surface of the fifth lens, the curvature radius R11 of the object side surface of the sixth lens, the effective focal length f5 of the fifth lens, and the effective focal length f6 of the sixth lens satisfy: -3.0 < f5 / R10 + f6 / R11 ≤ -2.0. By restricting f5 / R10 + f6 / R11 within a reasonable range, the effective focal lengths of the fifth lens and the sixth lens can be reasonably allocated, and the astigmatism, field curvature, and distortion generated by the second lens group can be corrected, thereby realizing the correction of the comprehensive aberration and improving the imaging quality. Preferably, -2.67 ≤ f5 / R10 + f6 / R11 ≤ -2.04.

[0083] In this embodiment, the center thickness CT3 of the third lens, the center thickness CT4 of the fourth lens, and the sum ∑ATi of the air spaces on the optical axis between any two adjacent lenses among the first lens to the sixth lens when the optical imaging system is in the telephoto position satisfy: 0.7 ≤ (CT3 + CT4) / ∑ATi ≤ 0.9. By restricting (CT3 + CT4) / ∑ATi within a reasonable range, the relationship between the third lens and the fourth lens and the total system length can be reasonably optimized and improved, the optical powers of the third lens and the fourth lens can be indirectly allocated, and further the optical powers of the first lens group and the second lens group can be balanced. Thus, at different object distances, the optical powers can be balanced and switched, the balanced correction of the overall aberration can be achieved, and the imaging quality can be improved. Preferably, 0.74 ≤ (CT3 + CT4) / ∑ATi ≤ 0.88.

[0084] Embodiment 2

[0085] As Figures 1 to 49 shown, the optical imaging system sequentially includes a first lens group and a second lens group from the object side to the image side. The first lens group has a positive optical power, and the second lens group has a positive optical power. The first lens group includes a first lens, a second lens, and a third lens. The first lens has a positive optical power; the second lens has a negative optical power; the third lens has a positive optical power; the second lens group includes a fourth lens, a fifth lens, and a sixth lens. The fourth lens has a negative optical power; the fifth lens has a positive optical power; the sixth lens has a negative optical power. Among them, when the object to be photographed moves closer to the optical imaging system, the position of the second lens group on the optical axis of the optical imaging system is moved to achieve focus adjustment. The difference △f between the effective focal lengths of the optical imaging system at the telephoto position and the close-up position and the difference △T between the air spaces of the first lens group and the second lens group on the optical axis of the optical imaging system at the telephoto position and the close-up position satisfy: 0.15 < |△f| / |△T| ≤ 0.30.

[0086] By setting the second lens group to be movable on the optical axis, the focal length of the optical imaging system can be adjusted to achieve clear imaging in cooperation with different object distances. By alternately setting the positive and negative of the optical powers of each lens, it is beneficial to correct the aberration and improve the imaging quality. By restricting |△f| / |△T| within a reasonable range, the relationship between the change in the effective focal length and the change in the air space when the object distance is switched can be constrained, the performance of the optical imaging system at different object distances can be improved, and at the same time, the sensitivity of the second lens group during movement can be reduced.

[0087] Preferably, the difference △f between the effective focal lengths of the optical imaging system at the telephoto position and the close-up position and the difference △T between the air spaces of the first lens group and the second lens group on the optical axis of the optical imaging system at the telephoto position and the close-up position satisfy: 0.18 ≤ |△f| / |△T| ≤ 0.30.

[0088] In this embodiment, the effective focal length F1 of the first lens group and the difference ΔT between the air gaps on the optical axis of the first lens group and the second lens group when the optical imaging system is in the telephoto position and the close-up position satisfy: 4.5 < F1 / (|ΔT| * 10) < 7.0. By restricting F1 / (|ΔT| * 10) within a reasonable range, the effective focal length of the first lens group can be reasonably allocated, the sensitivity of the second lens group during movement can be reduced, and at the same time, basic aberrations such as spherical aberration, coma, astigmatism, field curvature, and distortion generated by the movement of the second lens group can be reduced, improving the imaging quality. Preferably, 4.92 ≤ F1 / (|ΔT| * 10) ≤ 6.61.

[0089] In this embodiment, the effective focal length f1 of the first lens and the difference ΔT between the air gaps on the optical axis of the first lens group and the second lens group when the optical imaging system is in the telephoto position and the close-up position satisfy: 5.0 < f1 / (|ΔT| * 10) < 7.0. By restricting f1 / (|ΔT| * 10) within a reasonable range, the effective focal length of the first lens can be reasonably allocated, the sensitivity of the first lens in the first lens group can be reduced, and basic imaging aberrations such as spherical aberration, coma, chromatic aberration, and field curvature caused by the first lens can be reduced, improving the imaging performance of the optical imaging system. Preferably, 5.11 ≤ f1 / (|ΔT| * 10) ≤ 6.70.

[0090] In this embodiment, the effective focal length F1 of the first lens group and the distance Td1 on the optical axis from the object side surface of the first lens to the image side surface of the third lens satisfy: 3.0 < F1 / Td1 < 4.0. By restricting F1 / Td1 within a reasonable range, the aberration generated by the first lens can be improved, the aberration of the optical imaging system can be preliminarily corrected, and the imaging quality can be improved.

[0091] In this embodiment, the effective focal length F2 of the second lens group and the distance Td2 on the optical axis from the object side surface of the fourth lens to the image side surface of the sixth lens satisfy: 3.0 < F2 / Td2 < 5.5. By restricting F2 / Td2 within a reasonable range, the aberration generated by the second lens group can be reduced, and at the same time, it is beneficial to balance the performance of the optical imaging system under different object distance shooting conditions. Preferably, 3.19 ≤ F2 / Td2 ≤ 5.34.

[0092] In this embodiment, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the effective focal length f3 of the third lens satisfy: -2.5 < (f1 + f3) / f2 < -1.5. By restricting (f1 + f3) / f2 within a reasonable range, the effective focal lengths of the respective lenses of the first lens group can be reasonably allocated, the imaging performance under different object distance shooting conditions can be improved, and at the same time, the sensitivity of the lenses of the first lens group can be reduced. Preferably, -2.20 ≤ (f1 + f3) / f2 ≤ -1.66.

[0093] In this embodiment, the center thickness CT1 of the first lens and the air interval T12 between the first lens and the second lens on the optical axis satisfy: 0.8 <CT1 / T12<1.5。通过将CT1 / T12限制在合理的范围内,有利于合理分配第一透镜的光焦度,降低第一透镜产生的像差,同时可降低第一透镜的中心厚度的感度,并降低第一透镜和第二透镜之间的空气间隔的感度,进而降低第一透镜和第二透镜组立后的感度,提升光学成像系统的良率。优选地,0.86≤CT1 / T12≤1.33。

[0094] In this embodiment, the air interval T12 between the first lens and the second lens on the optical axis and the center thickness CT2 of the second lens satisfy: 1.2 <T12 / CT2≤1.8。通过将T12 / CT2限制在合理的范围内,有利于合理分配第二透镜的光焦度,降低第二透镜的中心厚度的感度,同时可实现光学成像系统的球差、色差的校正,提升系统的光学性能。优选地,1.26≤T12 / CT2≤1.77。

[0095] In this embodiment, the effective focal length F1 of the first lens group, the center thickness CT1 of the first lens, and the center thickness CT3 of the third lens satisfy the following conditions: 5.5 <F1 / (CT1+CT3)<7.0。通过将F1 / (CT1+CT3)限制在合理的范围内,能够合理分配第一透镜的有效焦距,提升光学成像系统的成像性能,同时降低第一透镜和第三透镜引起的球差、彗差、像散等基本像差,同时有利于色差的优化改善,降低紫边风险。优选地,5.74≤F1 / (CT1+CT3)≤6.89。

[0096] In this embodiment, the radius of curvature R9 of the object side surface of the fifth lens, the radius of curvature R10 of the image side surface of the fifth lens, and the center thickness CT5 of the fifth lens satisfy the following conditions: 3.5<(R9-R10) / CT5<10.0. By limiting (R9-R10) / CT5 within a reasonable range, it is beneficial to reasonably distribute the optical power of the fifth lens. Under the premise that the fifth lens itself cannot be corrected for astigmatism, the aberration generated by the fifth lens is reduced as much as possible, thereby achieving optimization and improvement of the comprehensive aberration and improving the imaging quality. Preferably, 3.5<(R9-R10) / CT5≤6.0. Further preferably, 3.96≤(R9-R10) / CT5≤9.34.

[0097] In this embodiment, the curvature radius R12 of the image side surface of the sixth lens and the central thickness CT6 of the sixth lens satisfy: 1.5 < R12 / CT6 < 3.5. By restricting R12 / CT6 within a reasonable range, it is beneficial to reasonably distribute the optical power of the sixth lens. Under the condition that there are distortion and astigmatism aberrations on one side of the sixth lens, positive and negative corrections of the distortion and astigmatism aberrations on both sides can be achieved, thereby realizing the correction of the overall aberration and improving the imaging quality. Preferably, 1.81 ≤ R12 / CT6 ≤ 3.12.

[0098] In this embodiment, the curvature radius R10 of the image side surface of the fifth lens, the curvature radius R11 of the object side surface of the sixth lens, the effective focal length f5 of the fifth lens, and the effective focal length f6 of the sixth lens satisfy: -3.0 < f5 / R10 + f6 / R11 ≤ -2.0. By restricting f5 / R10 + f6 / R11 within a reasonable range, the effective focal lengths of the fifth lens and the sixth lens can be reasonably distributed, correcting the astigmatism, field curvature, and distortion generated by the second lens group, thereby realizing the correction of the overall aberration and improving the imaging quality. Preferably, -2.67 ≤ f5 / R10 + f6 / R11 ≤ -2.04.

[0099] In this embodiment, the central thickness CT3 of the third lens, the central thickness CT4 of the fourth lens, and the sum ∑ATi of the air gaps on the optical axis between any two adjacent lenses among the first lens to the sixth lens when the optical imaging system is in the telephoto position satisfy: 0.7 ≤ (CT3 + CT4) / ∑ATi ≤ 0.9. By restricting (CT3 + CT4) / ∑ATi within a reasonable range, the relationship between the third lens and the fourth lens and the total length of the system can be reasonably optimized and improved, indirectly distributing the optical power of the third lens and the fourth lens, thereby balancing the optical power of the first lens group and the second lens group, realizing the balanced switching of the optical power at different object distances, realizing the balanced correction of the overall aberration, and improving the imaging quality. Preferably, 0.74 ≤ (CT3 + CT4) / ∑ATi ≤ 0.88.

[0100] Optionally, the above optical imaging system may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0101] The optical imaging system in this application can adopt multiple lenses, such as the six lenses described above. By reasonably distributing the optical power, surface shape, central thickness of each lens, and the axial distance between each lens, etc., the aperture of the optical imaging system can be effectively increased, the sensitivity of the lens can be reduced, and the processability of the lens can be improved, making the optical imaging system more conducive to production and processing and applicable to portable electronic devices such as smart phones.

[0102] In the present application, at least one of the lens surfaces of each lens is an aspherical surface. The characteristics of an aspherical lens are that the curvature continuously changes 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 astigmatism aberration. After using an aspherical lens, it is possible to eliminate as much as possible the aberration that appears during imaging, thereby improving the imaging quality. However, those skilled in the art should understand that without departing from the technical solution claimed in the present application, the number of lenses constituting the optical imaging system can be changed to obtain the various results and advantages described in this specification. For example, although six lenses are described as an example in the embodiment, the optical imaging system is not limited to including six lenses. If necessary, the optical imaging system may also include other numbers of lenses.

[0103] The following further describes, with reference to the accompanying drawings, examples of the specific surface types and parameters of the optical imaging system applicable to the above embodiments.

[0104] It should be noted that any one of Examples 1 to 7 below is applicable to all embodiments of the present application.

[0105] Example 1

[0106] As Figures 1 to 7 shown, the optical imaging system of Example 1 of the present application is described. Figure 1 The schematic diagram of the structure of the optical imaging system of Example 1 is shown.

[0107] As Figure 1 shown, the optical imaging system sequentially includes, from the object side to the image side, a first lens group G1, a second lens group G2, a filter E7, and an imaging surface S15. Among them, the first lens group G1 includes a stop STO, a first lens E1, a second lens E2, and a third lens E3; the second lens group G2 includes a fourth lens E4, a fifth lens E5, and a sixth lens E6.

[0108] The first lens group G1 has a positive optical power, and the second lens group G2 has a positive optical power. The first lens E1 has a positive optical power. 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 second lens E2 has a negative optical power. The object side surface S3 of the second lens is a concave surface, and the image side surface S4 of the second lens is a concave surface; the third lens E3 has a positive optical power. 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 fourth lens E4 has a negative optical power. The object side surface S7 of the fourth lens is a concave surface, and the image side surface S8 of the fourth lens is a convex surface; the fifth lens E5 has a positive optical power. 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 sixth lens E6 has a negative optical power. The object side surface S11 of the sixth lens is a convex surface, and the image side surface S12 of the sixth lens is a concave surface. The filter E7 has an object side surface S13 of the filter and an image side surface S14 of the filter. The light from the object sequentially passes through the surfaces S1 to S14 and finally forms an image on the imaging surface S15.

[0109] Table 1 shows the basic structural parameter table of the optical imaging system in Example 1. Among them, the units of the radius of curvature, thickness / distance, effective focal length, and effective radius are all millimeters (mm). The left column 370mm in the thickness column is when the optical imaging system is in the telephoto position, and the distance between the object and the optical imaging system is 370mm. The right column 100mm in the thickness column is when the optical imaging system is in the close-up position, and the distance between the object and the optical imaging system is 100mm.

[0110]

[0111]

[0112] Table 1

[0113] In Example 1, the object side surface and the image side surface of any one of the first lens E1 to the sixth lens E6 are aspherical surfaces. The surface profiles of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0114]

[0115] Among them, x is the sagitta of 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 1 above); k is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below gives the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 that can be used for the aspherical surfaces S1 - S12 in Example 1.

[0116]

[0117]

[0118] Table 2

[0119] Figure 2 shows the axial chromatic aberration curve of the optical imaging system of Example 1 at the close-up position, which represents the deviation of the focusing points of light rays with different wavelengths after passing through the lens. Figure 3 shows the astigmatism curve of the optical imaging system of Example 1 at the close-up position, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 4 shows the distortion curve of the optical imaging system of Example 1 at the close-up position, which represents the distortion magnitude values corresponding to different field angles.

[0120] Figure 5 shows the axial chromatic aberration curve of the optical imaging system of Example 1 at the telephoto position, which represents the deviation of the focusing points of light rays with different wavelengths after passing through the lens. Figure 6 shows the astigmatism curve of the optical imaging system of Example 1 at the telephoto position, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 7 shows the distortion curve of the optical imaging system of Example 1 at the telephoto position, which represents the distortion magnitude values corresponding to different field angles.

[0121] According to Figures 2 to 7 it can be seen that the optical imaging system given in Example 1 can achieve good imaging quality.

[0122] Example 2

[0123] As Figures 8 to 14 shown, the optical imaging system of Example 2 of the present application is described. Figure 8 shows a schematic diagram of the structure of the optical imaging system of Example 2. For the sake of simplicity, some descriptions similar to those of Example 1 will be omitted.

[0124] As Figure 8 shown, the optical imaging system sequentially includes a first lens group G1, a second lens group G2, a filter E7, and an imaging surface S15 from the object side to the image side. Among them, the first lens group G1 includes a stop STO, a first lens E1, a second lens E2, and a third lens E3; the second lens group G2 includes a fourth lens E4, a fifth lens E5, and a sixth lens E6.

[0125] The first lens group G1 has a positive optical power, and the second lens group G2 has a positive optical power. The first lens E1 has a positive optical power. The object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave; the second lens E2 has a negative optical power. The object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave; the third lens E3 has a positive optical power. The object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is concave; the fourth lens E4 has a negative optical power. The object side surface S7 of the fourth lens is concave, and the image side surface S8 of the fourth lens is convex; the fifth lens E5 has a positive optical power. The object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is convex; the sixth lens E6 has a negative optical power. The object side surface S11 of the sixth lens is convex, and the image side surface S12 of the sixth lens is concave. The filter E7 has an object side surface S13 of the filter and an image side surface S14 of the filter. The light from the object sequentially passes through the surfaces S1 to S14 and finally forms an image on the imaging surface S15.

[0126] Table 3 shows the basic structural parameter table of the optical imaging system in Example 2. Among them, the units of the radius of curvature, thickness / distance, effective focal length, and effective radius are all millimeters (mm). The left column 370mm in the thickness column is when the optical imaging system is in the telephoto position, and the distance between the object and the optical imaging system is 370mm. The right column 100mm in the thickness column is when the optical imaging system is in the close-up position, and the distance between the object and the optical imaging system is 100mm.

[0127]

[0128]

[0129] Table 3

[0130] Table 4 gives the higher-order term coefficients that can be used for each aspherical mirror surface in Example 2. Among them, each aspherical surface type can be defined by the formula (1) given in Example 1 above.

[0131]

[0132]

[0133] Table 4

[0134] Figure 9 Shows the axial chromatic aberration curve of the optical imaging system in Example 2 at the close-up position, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 10 Shows the astigmatism curve of the optical imaging system in Example 2 at the close-up position, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 11Shows the distortion curve of the optical imaging system in Example 2 at the close-up position, which represents the distortion magnitude values corresponding to different field angles.

[0135] Figure 12 Shows the axial chromatic aberration curve of the optical imaging system in Example 2 at the telephoto position, which represents the deviation of the focus points of light rays with different wavelengths after passing through the lens. Figure 13 Shows the astigmatism curve of the optical imaging system in Example 2 at the telephoto position, which represents the curvature of the meridional image plane and the sagittal image plane. Figure 14 Shows the distortion curve of the optical imaging system in Example 2 at the telephoto position, which represents the distortion magnitude values corresponding to different field angles.

[0136] According to Figures 9 to 14 it can be seen that the optical imaging system given in Example 2 can achieve good imaging quality.

[0137] Example 3

[0138] As Figures 15 to 21 shown, describes the optical imaging system of Example 3 of the present application. Figure 15 Shows a schematic diagram of the structure of the optical imaging system in Example 3.

[0139] As Figure 15 shown, the optical imaging system sequentially includes a first lens group G1, a second lens group G2, a filter E7, and an imaging surface S15 from the object side to the image side. Among them, the first lens group G1 includes a stop STO, a first lens E1, a second lens E2, and a third lens E3; the second lens group G2 includes a fourth lens E4, a fifth lens E5, and a sixth lens E6.

[0140] The first lens group G1 has a positive optical power, and the second lens group G2 has a positive optical power. The first lens E1 has a positive optical power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave; the second lens E2 has a negative optical power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave; the third lens E3 has a positive optical power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is concave; the fourth lens E4 has a negative optical power, the object side surface S7 of the fourth lens is concave, and the image side surface S8 of the fourth lens is concave; the fifth lens E5 has a positive optical power, the object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is convex; the sixth lens E6 has a negative optical power, the object side surface S11 of the sixth lens is convex, and the image side surface S12 of the sixth lens is concave. The filter E7 has an object side surface S13 of the filter and an image side surface S14 of the filter. Light from the object sequentially passes through the surfaces S1 to S14 and finally forms an image on the imaging surface S15.

[0141] Table 5 shows the basic structural parameter table of the optical imaging system in Example 3. Among them, the units of the radius of curvature, thickness / distance, effective focal length, and effective radius are all millimeters (mm). The left column 370mm in the thickness column indicates that the optical imaging system is in the telephoto position, and the distance between the object and the optical imaging system is 370mm. The right column 100mm in the thickness column indicates that the optical imaging system is in the close-up position, and the distance between the object and the optical imaging system is 100mm.

[0142]

[0143]

[0144] Table 5

[0145] Table 6 gives the high-order term coefficients available for each aspherical mirror surface in Example 3. Among them, each aspherical surface type can be defined by the formula (1) given in Example 1 above.

[0146]

[0147] Table 6

[0148] Figure 16 Shows the axial chromatic aberration curve of the optical imaging system in Example 3 at the close-up position, which represents the deviation of the focus points of light rays with different wavelengths after passing through the lens. Figure 17 Shows the astigmatism curve of the optical imaging system in Example 3 at the close-up position, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 18 Shows the distortion curve of the optical imaging system in Example 3 at the close-up position, which represents the distortion magnitude values corresponding to different field angles.

[0149] Figure 19 Shows the axial chromatic aberration curve of the optical imaging system in Example 3 at the telephoto position, which represents the deviation of the focus points of light rays with different wavelengths after passing through the lens. Figure 20 Shows the astigmatism curve of the optical imaging system in Example 3 at the telephoto position, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 21 Shows the distortion curve of the optical imaging system in Example 3 at the telephoto position, which represents the distortion magnitude values corresponding to different field angles.

[0150] According to Figures 16 to 21 it can be known that the optical imaging system given in Example 3 can achieve good imaging quality.

[0151] Example 4

[0152] As Figures 22 to 28 shown, it describes the optical imaging system of Example 4 of the present application. Figure 22 Shows a schematic diagram of the structure of the optical imaging system in Example 4.

[0153] As shown Figure 22 in FIG. 1, the optical imaging system sequentially includes a first lens group G1, a second lens group G2, a filter E7, and an imaging surface S15 from the object side to the image side. Among them, the first lens group G1 includes a stop STO, a first lens E1, a second lens E2, and a third lens E3; the second lens group G2 includes a fourth lens E4, a fifth lens E5, and a sixth lens E6.

[0154] The first lens group G1 has a positive optical power, and the second lens group G2 has a positive optical power. The first lens E1 has a positive optical power. The object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave; the second lens E2 has a negative optical power. The object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave; the third lens E3 has a positive optical power. The object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is convex; the fourth lens E4 has a negative optical power. The object side surface S7 of the fourth lens is concave, and the image side surface S8 of the fourth lens is concave; the fifth lens E5 has a positive optical power. The object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is convex; the sixth lens E6 has a negative optical power. The object side surface S11 of the sixth lens is convex, and the image side surface S12 of the sixth lens is concave. The filter E7 has an object side surface S13 of the filter and an image side surface S14 of the filter. The light from the object sequentially passes through the surfaces S1 to S14 and finally forms an image on the imaging surface S15.

[0155] Table 7 shows the basic structural parameter table of the optical imaging system in Example 4. Among them, the units of the radius of curvature, thickness / distance, effective focal length, and effective radius are all millimeters (mm). The left column 370mm in the thickness column is when the optical imaging system is in the telephoto position, and the distance between the object and the optical imaging system is 370mm. The right column 100mm in the thickness column is when the optical imaging system is in the close-up position, and the distance between the object and the optical imaging system is 100mm.

[0156]

[0157]

[0158] Table 7

[0159] Table 8 gives the high-order term coefficients available for each aspherical mirror surface in Example 4. Among them, each aspherical surface type can be defined by the formula (1) given in Example 1 above.

[0160] Face number A4 A6 A8 A10 A12 A14 A16 S1 6.5963E-03 -1.1916E-01 9.5822E-01 -4.7837E+00 1.4902E+01 -2.9147E+01 3.5491E+01 S2 -2.1190E-02 -1.6840E-01 1.7191E+00 -1.2571E+01 5.8642E+01 -1.7939E+02 3.6428E+02 S3 -1.4468E-01 8.0220E-02 -3.9057E-01 8.5406E-01 -1.9345E+00 4.0029E+00 -5.8683E+00 S4 -1.6112E-01 -1.2266E-01 1.9649E+00 -8.4817E+00 2.1518E+01 -3.5946E+01 4.0628E+01 S5 -1.5303E-01 -2.5646E-01 2.0077E+00 -6.0860E+00 1.1760E+01 -1.5544E+01 1.4172E+01 S6 4.3866E-02 -6.9928E-01 2.5502E+00 -6.5657E+00 1.2386E+01 -1.7098E+01 1.7118E+01 S7 2.3672E-01 -6.1250E-01 1.6757E+00 -3.8175E+00 6.4655E+00 -7.8418E+00 6.7181E+00 S8 -4.0957E-02 -4.4032E-01 1.7544E+00 -3.9131E+00 5.3962E+00 -4.8473E+00 2.8978E+00 S9 -4.7739E-02 -2.6544E-01 9.6851E-01 -1.8201E+00 2.1747E+00 -1.8108E+00 1.0882E+00 S10 5.9215E-01 -1.1182E+00 1.6907E+00 -1.5858E+00 8.5255E-01 -2.0648E-01 -3.0458E-02 S11 -5.9497E-03 -1.0621E+00 2.1156E+00 -2.2591E+00 1.3425E+00 -2.8614E-01 -1.9250E-01 S12 -8.1315E-01 7.2985E-01 -4.8810E-01 2.1818E-01 -5.6581E-02 3.1840E-03 3.4758E-03 Face number A18 A20 A22 A24 A26 A28 A30 S1 -2.5616E+01 9.8944E+00 -1.5890E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 -4.8510E+02 4.0623E+02 -1.9333E+02 3.9691E+01 0.0000E+00 0.0000E+00 0.0000E+00 S3 5.5173E+00 -2.8307E+00 5.7965E-01 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 -3.0760E+01 1.4950E+01 -4.2156E+00 5.2366E-01 0.0000E+00 0.0000E+00 0.0000E+00 S5 -8.7675E+00 3.5172E+00 -8.2507E-01 8.5758E-02 0.0000E+00 0.0000E+00 0.0000E+00 S6 -1.2231E+01 6.0573E+00 -1.9719E+00 3.7899E-01 -3.2550E-02 0.0000E+00 0.0000E+00 S7 -4.0167E+00 1.6365E+00 -4.3246E-01 6.6754E-02 -4.5662E-03 0.0000E+00 0.0000E+00 S8 -1.1435E+00 2.8448E-01 -3.9556E-02 2.0742E-03 5.6474E-05 0.0000E+00 0.0000E+00 S9 -4.7415E-01 1.4785E-01 -3.2064E-02 4.5884E-03 -3.8940E-04 1.4756E-05 1.7250E-08 S10 3.8928E-02 -1.2860E-02 2.2061E-03 -1.9593E-04 6.3963E-06 9.7181E-08 0.0000E+00 S11 1.9658E-01 -8.6819E-02 2.3418E-02 -4.0745E-03 4.4751E-04 -2.8251E-05 7.8035E-07 S12 -1.4711E-03 3.1234E-04 -4.0585E-05 3.2450E-06 -1.4503E-07 2.5613E-09 1.5090E-11

[0161] Table 8

[0162] Figure 23Shows the axial chromatic aberration curve of the optical imaging system in Example 4 at the close-up position, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 24 Shows the astigmatism curve of the optical imaging system in Example 4 at the close-up position, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 25 Shows the distortion curve of the optical imaging system in Example 4 at the close-up position, which represents the distortion magnitude values corresponding to different field angles.

[0163] Figure 26 Shows the axial chromatic aberration curve of the optical imaging system in Example 4 at the telephoto position, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 27 Shows the astigmatism curve of the optical imaging system in Example 4 at the telephoto position, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 28 Shows the distortion curve of the optical imaging system in Example 4 at the telephoto position, which represents the distortion magnitude values corresponding to different field angles.

[0164] According to Figures 23 to 28 It can be seen that the optical imaging system given in Example 4 can achieve good imaging quality.

[0165] Example 5

[0166] As Figures 29 to 35 shown, describes the optical imaging system of Example 5 of the present application. Figure 29 Shows a schematic diagram of the structure of the optical imaging system in Example 5.

[0167] As Figure 29 shown, the optical imaging system sequentially includes a first lens group G1, a second lens group G2, a filter E7, and an imaging surface S15 from the object side to the image side. Among them, the first lens group G1 includes a stop STO, a first lens E1, a second lens E2, and a third lens E3; the second lens group G2 includes a fourth lens E4, a fifth lens E5, and a sixth lens E6.

[0168] The first lens group G1 has a positive optical power, and the second lens group G2 has a positive optical power. The first lens E1 has a positive optical power. The object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave; the second lens E2 has a negative optical power. The object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave; the third lens E3 has a positive optical power. The object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is convex; the fourth lens E4 has a negative optical power. The object side surface S7 of the fourth lens is concave, and the image side surface S8 of the fourth lens is convex; the fifth lens E5 has a positive optical power. The object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is convex; the sixth lens E6 has a negative optical power. The object side surface S11 of the sixth lens is convex, and the image side surface S12 of the sixth lens is concave. The filter E7 has an object side surface S13 of the filter and an image side surface S14 of the filter. The light from the object sequentially passes through the surfaces S1 to S14 and finally forms an image on the imaging surface S15.

[0169] Table 9 shows the basic structural parameter table of the optical imaging system of Example 5. Among them, the units of the radius of curvature, thickness / distance, effective focal length, and effective radius are all millimeters (mm). The left column 370mm in the thickness column is when the optical imaging system is in the telephoto position, and the distance between the object to be photographed and the optical imaging system is 370mm. The right column 100mm in the thickness column is when the optical imaging system is in the close-up position, and the distance between the object to be photographed and the optical imaging system is 100mm.

[0170]

[0171]

[0172] Table 9

[0173] Table 10 gives the high-order term coefficients that can be used for each aspherical mirror surface in Example 5. Among them, each aspherical surface type can be defined by the formula (1) given in Example 1 above.

[0174] Face number A4 A6 A8 A10 A12 A14 A16 S1 -4.0440E-03 -1.5943E-01 1.2318E+00 -6.2496E+00 1.9543E+01 -3.8733E+01 4.8390E+01 S2 -3.5410E-02 -1.0026E-01 6.3223E-01 -3.7545E+00 1.4679E+01 -3.8850E+01 6.9558E+01 S3 -1.1752E-01 1.9154E-02 2.0465E-02 -2.5074E-01 -1.2117E-01 1.8192E+00 -3.6241E+00 S4 -1.8304E-01 4.0135E-02 7.8704E-01 -3.1300E+00 6.6310E+00 -9.1887E+00 8.6825E+00 S5 -1.7808E-01 -5.9551E-02 1.0630E+00 -3.2806E+00 6.2231E+00 -8.0178E+00 7.0600E+00 S6 4.5600E-02 -5.8381E-01 1.8872E+00 -4.0509E+00 6.1186E+00 -6.6466E+00 5.2403E+00 S7 4.3333E-01 -1.2317E+00 2.3424E+00 -2.9540E+00 2.4824E+00 -1.3678E+00 4.6013E-01 S8 3.3088E-01 -8.1418E-01 9.6711E-01 -7.6542E-01 4.0581E-01 -1.3873E-01 2.9477E-02 S9 1.8809E-02 -2.2677E-03 -7.1184E-02 1.3355E-01 -1.3628E-01 7.9421E-02 -2.0751E-02 S10 4.8257E-01 -8.0778E-01 1.4585E+00 -1.7725E+00 1.4274E+00 -7.9037E-01 3.0854E-01 S11 4.3084E-02 -5.6278E-01 1.1788E+00 -1.5397E+00 1.3173E+00 -7.6319E-01 3.0779E-01 S12 -6.9914E-01 7.5766E-01 -7.1676E-01 5.0991E-01 -2.6549E-01 1.0168E-01 -2.8832E-02 Face number A18 A20 A22 A24 A26 A28 A30 S1 -3.6631E+01 1.5284E+01 -2.6940E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 -8.2477E+01 6.1766E+01 -2.6275E+01 4.8046E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 3.4652E+00 -1.6489E+00 3.1064E-01 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 -5.5433E+00 2.2870E+00 -5.4919E-01 5.8048E-02 0.0000E+00 0.0000E+00 0.0000E+00 S5 -4.1642E+00 1.5688E+00 -3.4019E-01 3.2210E-02 0.0000E+00 0.0000E+00 0.0000E+00 S6 -2.9848E+00 1.2005E+00 -3.2391E-01 5.2589E-02 -3.8745E-03 0.0000E+00 0.0000E+00 S7 -7.0900E-02 -7.4072E-03 5.2596E-03 -8.5198E-04 4.6761E-05 0.0000E+00 0.0000E+00 S8 -4.3712E-03 7.5963E-04 -1.2077E-04 3.0863E-06 9.5098E-07 0.0000E+00 0.0000E+00 S9 -4.2199E-03 5.7254E-03 -2.2968E-03 5.1792E-04 -6.9791E-05 5.2606E-06 -1.7118E-07 S10 -8.5707E-02 1.6841E-02 -2.2866E-03 2.0395E-04 -1.0747E-05 2.5350E-07 0.0000E+00 S11 -8.7772E-02 1.7744E-02 -2.5125E-03 2.4143E-04 -1.4770E-05 5.0447E-07 -6.8784E-09 S12 6.0574E-03 -9.3682E-04 1.0498E-04 -8.2728E-06 4.3403E-07 -1.3595E-08 1.9217E-10

[0175] Table 10

[0176] Figure 30 Shows the axial chromatic aberration curve of the optical imaging system of Example 5 in the close-up position, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 31 Shows the astigmatism curve of the optical imaging system of Example 5 in the close-up position, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 32 Shows the distortion curve of the optical imaging system of Example 5 in the close-up position, which represents the distortion magnitude values corresponding to different field angles.

[0177] Figure 33 Shows the axial chromatic aberration curve of the optical imaging system in Example 5 at the telephoto position, which represents the deviation of the focusing points of light rays of different wavelengths after passing through the lens. Figure 34 Shows the astigmatism curve of the optical imaging system in Example 5 at the telephoto position, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 35 Shows the distortion curve of the optical imaging system in Example 5 at the telephoto position, which represents the distortion magnitude values corresponding to different field angles.

[0178] According to Figures 30 to 35 it can be known that the optical imaging system given in Example 5 can achieve good imaging quality.

[0179] Example 6

[0180] As Figures 36 to 42 shown, describes the optical imaging system of Example 6 of the present application. Figure 36 Shows a schematic diagram of the structure of the optical imaging system in Example 6.

[0181] As Figure 36 shown, the optical imaging system sequentially includes a first lens group G1, a second lens group G2, a filter E7, and an imaging surface S15 from the object side to the image side. Among them, the first lens group G1 includes a diaphragm STO, a first lens E1, a second lens E2, and a third lens E3; the second lens group G2 includes a fourth lens E4, a fifth lens E5, and a sixth lens E6.

[0182] The first lens group G1 has a positive focal power, and the second lens group G2 has a positive focal power. The first lens E1 has a positive focal power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave; the second lens E2 has a negative focal power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave; the third lens E3 has a positive focal power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is concave; the fourth lens E4 has a negative focal power, the object side surface S7 of the fourth lens is concave, and the image side surface S8 of the fourth lens is convex; the fifth lens E5 has a positive focal power, the object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is convex; the sixth lens E6 has a negative focal power, the object side surface S11 of the sixth lens is convex, and the image side surface S12 of the sixth lens is concave. The filter E7 has an object side surface S13 of the filter and an image side surface S14 of the filter. The light from the object sequentially passes through the surfaces S1 to S14 and finally forms an image on the imaging surface S15.

[0183] Table 11 shows the basic structural parameter table of the optical imaging system in Example 6. Among them, the units of radius of curvature, thickness / distance, effective focal length, and effective radius are all millimeters (mm). The left column of 370 mm in the thickness column indicates that the optical imaging system is in the telephoto position, and the distance between the object and the optical imaging system is 370 mm. The right column of 100 mm in the thickness column indicates that the optical imaging system is in the close-up position, and the distance between the object and the optical imaging system is 100 mm.

[0184]

[0185]

[0186] Table 11

[0187] Table 12 gives the high-order term coefficients available for each aspherical mirror surface in Example 6. Among them, each aspherical surface type can be defined by formula (1) given in Example 1 above.

[0188] Face number A4 A6 A8 A10 A12 A14 A16 S1 -1.7102E-02 -1.5786E-01 1.3228E+00 -7.4153E+00 2.4797E+01 -5.1494E+01 6.6024E+01 S2 -4.9190E-02 -2.1176E-01 1.8899E+00 -1.2040E+01 4.8642E+01 -1.3028E+02 2.3331E+02 S3 -1.6921E-01 3.5802E-01 -1.6382E+00 5.0242E+00 -1.1179E+01 1.7324E+01 -1.7998E+01 S4 -3.1990E-01 7.7231E-01 -1.8842E+00 3.3405E+00 -4.2025E+00 3.5422E+00 -1.7690E+00 S5 -2.8977E-01 4.0756E-01 -1.2241E-01 -1.4080E+00 4.3440E+00 -6.9728E+00 7.0190E+00 S6 4.4278E-02 -6.4801E-01 2.2281E+00 -4.8932E+00 7.3786E+00 -7.8522E+00 5.9541E+00 S7 5.3908E-01 -1.4903E+00 2.6443E+00 -2.9177E+00 1.7780E+00 -1.6764E-01 -6.7120E-01 S8 6.3094E-01 -1.5647E+00 2.1987E+00 -2.1636E+00 1.5360E+00 -7.9485E-01 3.0053E-01 S9 1.8747E-01 -5.0280E-01 8.8593E-01 -1.1392E+00 1.0978E+00 -8.0868E-01 4.5597E-01 S10 4.4802E-01 -7.1430E-01 1.2526E+00 -1.4696E+00 1.1350E+00 -5.9919E-01 2.2172E-01 S11 4.1872E-02 -5.5617E-01 1.1288E+00 -1.4167E+00 1.1719E+00 -6.6126E-01 2.6149E-01 S12 -7.0513E-01 7.2166E-01 -6.3683E-01 4.2747E-01 -2.1252E-01 7.8423E-02 -2.1560E-02 Face number A18 A20 A22 A24 A26 A28 A30 S1 -5.0291E+01 2.0751E+01 -3.5615E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 -2.7532E+02 2.0473E+02 -8.6515E+01 1.5766E+01 0.0000E+00 0.0000E+00 0.0000E+00 S3 1.1891E+01 -4.4684E+00 7.2012E-01 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 3.1559E-01 1.5089E-01 -9.2032E-02 1.4343E-02 0.0000E+00 0.0000E+00 0.0000E+00 S5 -4.5581E+00 1.8539E+00 -4.2896E-01 4.3008E-02 0.0000E+00 0.0000E+00 0.0000E+00 S6 -3.2019E+00 1.1956E+00 -2.9573E-01 4.3722E-02 -2.9334E-03 0.0000E+00 0.0000E+00 S7 6.0854E-01 -2.7338E-01 7.1158E-02 -1.0256E-02 6.3655E-04 0.0000E+00 0.0000E+00 S8 -8.1274E-02 1.4453E-02 -1.2785E-03 -2.4334E-05 1.0496E-05 0.0000E+00 0.0000E+00 S9 -1.9467E-01 6.1834E-02 -1.4269E-02 2.3110E-03 -2.4804E-04 1.5800E-05 -4.5131E-07 S10 -5.8042E-02 1.0686E-02 -1.3512E-03 1.1154E-04 -5.4030E-06 1.1626E-07 0.0000E+00 S11 -7.3617E-02 1.4809E-02 -2.1084E-03 2.0676E-04 -1.3218E-05 4.9197E-07 -7.9853E-09 S12 4.4103E-03 -6.6597E-04 7.2994E-05 -5.6325E-06 2.8956E-07 -8.8913E-09 1.2325E-10

[0189] Table 12

[0190] Figure 37 Shows the axial chromatic aberration curve of the optical imaging system in Example 6 at the close-up position, which represents the deviation of the convergence points of light rays with different wavelengths after passing through the lens. Figure 38 Shows the astigmatism curve of the optical imaging system in Example 6 at the close-up position, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 39 Shows the distortion curve of the optical imaging system in Example 6 at the close-up position, which represents the distortion magnitude values corresponding to different field angles.

[0191] Figure 40 Shows the axial chromatic aberration curve of the optical imaging system in Example 6 at the telephoto position, which represents the deviation of the convergence points of light rays with different wavelengths after passing through the lens. Figure 41 Shows the astigmatism curve of the optical imaging system in Example 6 at the telephoto position, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 42 Shows the distortion curve of the optical imaging system in Example 6 at the telephoto position, which represents the distortion magnitude values corresponding to different field angles.

[0192] According to Figures 37 to 42 it can be known that the optical imaging system given in Example 6 can achieve good imaging quality.

[0193] Example 7

[0194] As Figures 43 to 49 shown, it describes the optical imaging system of Example 7 of the present application. Figure 43Schematic diagram showing the structure of the optical imaging system of Example 7.

[0195] As Figure 43 shown, the optical imaging system sequentially includes a first lens group G1, a second lens group G2, a filter E7, and an imaging surface S15 from the object side to the image side. Among them, the first lens group G1 includes a stop STO, a first lens E1, a second lens E2, and a third lens E3; the second lens group G2 includes a fourth lens E4, a fifth lens E5, and a sixth lens E6.

[0196] The first lens group G1 has a positive focal power, and the second lens group G2 has a positive focal power. The first lens E1 has a positive focal power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave; the second lens E2 has a negative focal power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave; the third lens E3 has a positive focal power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is concave; the fourth lens E4 has a negative focal power, the object side surface S7 of the fourth lens is concave, and the image side surface S8 of the fourth lens is convex; the fifth lens E5 has a positive focal power, the object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is convex; the sixth lens E6 has a negative focal power, the object side surface S11 of the sixth lens is convex, and the image side surface S12 of the sixth lens is concave. The filter E7 has an object side surface S13 and an image side surface S14 of the filter. Light from the object sequentially passes through the surfaces S1 to S14 and finally forms an image on the imaging surface S15.

[0197] Table 13 shows the basic structure parameter table of the optical imaging system of Example 7. Among them, the units of the radius of curvature, thickness / distance, effective focal length, and effective radius are all millimeters (mm). The left column 370mm in the thickness column is when the optical imaging system is in the telephoto position, and the distance between the object and the optical imaging system is 370mm. The right column 83mm in the thickness column is when the optical imaging system is in the close-up position, and the distance between the object and the optical imaging system is 83mm.

[0198]

[0199]

[0200] Table 13

[0201] Table 14 gives the high-order term coefficients available for each aspherical mirror surface in Example 7. Among them, each aspherical surface type can be defined by the formula (1) given in Example 1 above.

[0202] Face number A4 A6 A8 A10 A12 A14 A16 S1 -2.7599E-02 1.0036E-01 -1.6332E+00 1.2499E+01 -5.9691E+01 1.8028E+02 -3.4435E+02 S2 -4.9869E-02 -1.5645E-01 1.0844E+00 -5.3566E+00 1.3404E+01 -9.1437E+00 -4.1525E+01 S3 -1.9181E-01 6.1052E-01 -3.3940E+00 1.2917E+01 -3.5133E+01 6.6534E+01 -8.6336E+01 S4 -3.9394E-01 1.1011E+00 -2.8345E+00 4.9870E+00 -5.1712E+00 1.1645E+00 4.6214E+00 S5 -3.7542E-01 4.9213E-01 4.2349E-01 -4.8731E+00 1.4944E+01 -2.7400E+01 3.3418E+01 S6 6.5883E-02 -8.7548E-01 3.0414E+00 -6.9016E+00 1.0926E+01 -1.2320E+01 9.9399E+00 S7 7.7050E-01 -2.1109E+00 4.1030E+00 -5.7279E+00 5.8968E+00 -4.5892E+00 2.7670E+00 S8 8.1545E-01 -1.8048E+00 2.5782E+00 -2.9094E+00 2.7810E+00 -2.2914E+00 1.5694E+00 S9 1.7643E-01 -4.4702E-01 8.3696E-01 -1.2111E+00 1.3226E+00 -1.0828E+00 6.6009E-01 S10 4.2526E-01 -6.3788E-01 1.0791E+00 -1.2180E+00 9.0085E-01 -4.5360E-01 1.5939E-01 S11 1.8812E-02 -4.8376E-01 1.0082E+00 -1.2919E+00 1.0989E+00 -6.4495E-01 2.6864E-01 S12 -7.5999E-01 7.9254E-01 -6.9824E-01 4.6572E-01 -2.2963E-01 8.3752E-02 -2.2670E-02 Face number A18 A20 A22 A24 A26 A28 A30 S1 4.0191E+02 -2.6089E+02 7.2082E+01 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 1.3228E+02 -1.7488E+02 1.1471E+02 -3.0486E+01 0.0000E+00 0.0000E+00 0.0000E+00 S3 7.4911E+01 -4.1359E+01 1.3117E+01 -1.8215E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 -6.5808E+00 3.5898E+00 -1.1641E-01 -8.4986E-01 4.0102E-01 -6.0872E-02 0.0000E+00 S5 -2.7798E+01 1.5608E+01 -5.6566E+00 1.1936E+00 -1.1130E-01 0.0000E+00 0.0000E+00 S6 -5.6858E+00 2.2472E+00 -5.8246E-01 8.8934E-02 -6.0521E-03 0.0000E+00 0.0000E+00 S7 -1.3178E+00 4.9580E-01 -1.4237E-01 2.8926E-02 -3.6376E-03 2.0991E-04 0.0000E+00 S8 -8.3854E-01 3.2832E-01 -8.8472E-02 1.4966E-02 -1.2724E-03 2.7416E-06 5.5232E-06 S9 -2.9717E-01 9.7680E-02 -2.3028E-02 3.7782E-03 -4.0860E-04 2.6141E-05 -7.4849E-07 S10 -3.9438E-02 6.8281E-03 -8.0739E-04 6.1906E-05 -2.7619E-06 5.4118E-08 0.0000E+00 S11 -8.0699E-02 1.7560E-02 -2.7451E-03 3.0076E-04 -2.1938E-05 9.5736E-07 -1.8916E-08 S12 4.5522E-03 -6.7350E-04 7.2261E-05 -5.4567E-06 2.7454E-07 -8.2516E-09 1.1197E-10

[0203] Table 14

[0204] Figure 44 Shows the axial chromatic aberration curve of the optical imaging system in Example 7 at the close-up position, which represents the deviation of the focus points of light rays of different wavelengths after passing through the lens. Figure 45 Shows the astigmatism curve of the optical imaging system in Example 7 at the close-up position, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 46 Shows the distortion curve of the optical imaging system in Example 7 at the close-up position, which represents the distortion magnitude values corresponding to different field angles of view.

[0205] Figure 47 Shows the axial chromatic aberration curve of the optical imaging system in Example 7 at the telephoto position, which represents the deviation of the focus points of light rays of different wavelengths after passing through the lens. Figure 48 Shows the astigmatism curve of the optical imaging system in Example 7 at the telephoto position, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 49 Shows the distortion curve of the optical imaging system in Example 7 at the telephoto position, which represents the distortion magnitude values corresponding to different field angles of view.

[0206] According to Figures 44 to 49 It can be known that the optical imaging system given in Example 7 can achieve good imaging quality.

[0207] In summary, Examples 1 to 7 respectively satisfy the relationships shown in Table 15.

[0208] Conditional expression / Example 1 2 3 4 5 6 7 TTL / F1 0.85 0.85 0.85 0.92 0.90 0.90 0.90 |△f| / |△T| 0.18 0.21 0.23 0.25 0.29 0.30 0.30 F1 / (|△T|*10) 6.32 6.41 6.61 5.84 5.84 6.01 4.92 f1 / (|△T|*10) 5.11 5.37 6.08 6.31 6.50 6.70 5.37 F1 / Td1 3.46 3.48 3.36 3.20 3.52 3.61 3.59 F2 / Td2 5.34 4.47 4.06 4.10 3.45 3.33 3.19 (f1+f3) / f2 -2.20 -2.12 -1.81 -1.66 -1.80 -1.88 -1.99 CT1 / T12 1.27 1.33 1.33 1.13 0.93 0.88 0.86 T12 / CT2 1.32 1.26 1.26 1.44 1.70 1.77 1.76 F1 / (CT1+CT3) 6.39 6.74 6.42 5.74 6.47 6.89 6.84 (R9 - R10) / CT5 9.34 7.87 5.22 3.96 4.80 5.95 5.75 R12 / CT6 3.12 2.32 2.18 1.94 1.92 1.87 1.81 f5 / R10 + f6 / R11 -2.04 -2.54 -2.67 -2.13 -2.06 -2.10 -2.08 (CT3 + CT4) / ∑AT 0.74 0.79 0.79 0.88 0.83 0.82 0.88

[0209] Table 15

[0210] Table 16 gives the effective focal lengths of the respective lenses of the optical imaging systems of Examples 1 to 7, where fi is the effective focal length of the optical imaging system at the telephoto position, FOVi is the maximum field angle of view of the optical imaging system at the telephoto position, and FOVm is the maximum field angle of view of the optical imaging system at the close-up position.

[0211] Parameter / Example 1 2 3 4 5 6 7 f1(mm) 4.35 4.57 5.09 5.64 6.52 6.60 6.44 f2(mm) -6.20 -7.76 -8.24 -7.32 -7.04 -6.63 -5.97 f3(mm) 9.31 11.91 9.85 6.48 6.14 5.84 5.43 f4(mm) -11.5 -6.91 -4.50 -4.09 -6.88 -15.29 -46.90 f5(mm) 2.47 2.23 1.85 1.45 1.50 1.59 1.60 f6(mm) -2.72 -2.95 -2.73 -1.78 -1.67 -1.61 -1.54 fi(mm) 3.24 3.21 3.17 3.09 3.29 3.30 3.24 FOVi(°) 43.32 43.54 43.88 44.88 46.04 45.89 46.51 FOVm(°) 44.26 44.54 44.80 46.08 47.62 47.53 48.37

[0212] Table 16

[0213] This application also provides an imaging device, the electronic photosensitive element of which can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor element (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated in a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging system described above.

[0214] Obviously, the embodiments described above are only some of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts shall fall within the protection scope of the present invention.

[0215] 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.

[0216] It should be noted that the terms "first", "second", etc. in the description and claims of the present application and the above 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 different from those illustrated or described herein.

[0217] 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 in the protection scope of the present invention.

Claims

1. An optical imaging system, characterized in that, The optical imaging system sequentially includes a first lens group and a second lens group from the object side to the image side. The optical imaging system is composed of six lenses. The first lens group has a positive optical power and is composed of three lenses. The second lens group has a positive optical power and is composed of three lenses. The first lens group includes: A first lens, which has a positive optical power. The object side surface of the first lens is convex, and the image side surface of the first lens is concave; A second lens, which has a negative optical power. The image side surface of the second lens is concave; A third lens, which has a positive optical power. The object side surface of the third lens is convex; The second lens group includes: A fourth lens, which has a negative optical power. The object side surface of the fourth lens is concave; A fifth lens, which has a positive optical power. The object side surface of the fifth lens is convex, and the image side surface of the fifth lens is convex; A sixth lens, which has a negative optical power. The object side surface of the sixth lens is convex, and the image side surface of the sixth lens is concave; Wherein, when the object to be photographed moves closer to the optical imaging system, the position of the second lens group on the optical axis of the optical imaging system is moved to achieve focus adjustment; The effective focal length F1 of the first lens group and the on-axis distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging system satisfy: 0.85 ≤ TTL / F1 ≤ 0.

92.

2. The optical imaging system according to claim 1, wherein The difference △f in the effective focal lengths of the optical imaging system at the telephoto position and the close-up position and the difference △T in the air gaps between the first lens group and the second lens group on the optical axis of the optical imaging system at the telephoto position and the close-up position satisfy: 0.15 < |△f| / |△T| ≤ 0.

30.

3. The optical imaging system according to claim 1, characterized in that, The effective focal length F1 of the first lens group and the difference △T in the air gaps between the first lens group and the second lens group on the optical axis of the optical imaging system at the telephoto position and the close-up position satisfy: 4.92 ≤ F1 / (|△T|*10) ≤ 6.

61.

4. The optical imaging system according to claim 1, wherein The effective focal length f1 of the first lens and the difference △T in the air gaps between the first lens group and the second lens group on the optical axis of the optical imaging system at the telephoto position and the close-up position satisfy: 5.11 ≤ f1 / (|△T|*10) ≤ 6.

70.

5. The optical imaging system according to claim 1, wherein The effective focal length F1 of the first lens group and the distance Td1 on the optical axis from the object side surface of the first lens to the image side surface of the third lens satisfy: 3.20 ≤ F1 / Td1 ≤ 3.

61.

6. The optical imaging system according to claim 1, characterized in that, The effective focal length F2 of the second lens group and the distance Td2 on the optical axis from the object side surface of the fourth lens to the image side surface of the sixth lens satisfy: 3.19 ≤ F2 / Td2 ≤ 5.

34.

7. The optical imaging system according to claim 1, wherein The effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the effective focal length f3 of the third lens satisfy: -2.20 ≤ (f1 + f3) / f2 ≤ -1.

66.

8. The optical imaging system according to claim 1, wherein The central thickness CT1 of the first lens and the air gap T12 between the first lens and the second lens on the optical axis satisfy: 0.86 ≤ CT1 / T12 ≤ 1.

33.

9. The optical imaging system according to any one of claims 1 to 8, characterized in that, The air gap T12 between the first lens and the second lens on the optical axis and the central thickness CT2 of the second lens satisfy: 1.26 ≤ T12 / CT2 ≤ 1.

8.

10. The optical imaging system according to any one of claims 1 to 8, characterized in that, The effective focal length F1 of the first lens group, the central thickness CT1 of the first lens, and the central thickness CT3 of the third lens satisfy: 5.74 ≤ F1 / (CT1 + CT3) ≤ 6.

89.

11. The optical imaging system according to any one of claims 1 to 8, characterized in that, The radius of curvature R9 of the object side of the fifth lens, the radius of curvature R10 of the image side of the fifth lens, and the central thickness CT5 of the fifth lens satisfy: 3.96 ≤ (R9 - R10) / CT5 ≤ 9.

34.

12. The optical imaging system according to claim 11, characterized in that, The radius of curvature R9 of the object side of the fifth lens, the radius of curvature R10 of the image side of the fifth lens, and the central thickness CT5 of the fifth lens satisfy: 3.96 ≤ (R9 - R10) / CT5 ≤ 6.

0.

13. The optical imaging system according to any one of claims 1 to 8, characterized in that The radius of curvature R12 of the image side of the sixth lens and the central thickness CT6 of the sixth lens satisfy: 1.81 ≤ R12 / CT6 ≤ 3.

12.

14. The optical imaging system according to any one of claims 1 to 8, characterized in that, The radius of curvature R10 of the image side of the fifth lens, the radius of curvature R11 of the object side of the sixth lens, the effective focal length f5 of the fifth lens, and the effective focal length f6 of the sixth lens satisfy: -2.67 ≤ f5 / R10 + f6 / R11 ≤ -2.

0.

15. The optical imaging system according to any one of claims 1 to 8, characterized in that, The central thickness CT3 of the third lens, the central thickness CT4 of the fourth lens, and the sum ∑ATi of the air gaps between any two adjacent lenses among the first lens to the sixth lens on the optical axis when the optical imaging system is in the telephoto position satisfy: 0.7 ≤ (CT3 + CT4) / ∑ATi ≤ 0.9.

Images