Zoom lens compensation group

Abstract

The invention provides a zoom lens compensation group, the number of lenses with focal power is five, the zoom lens compensation group comprises a lens group, a spacing element group and a lens barrel, and the lens group and the spacing element group are accommodated in the lens barrel; wherein the air interval T12 between the first lens and the second lens on the optical axis of the zoom lens compensation group and the air interval T23 between the second lens and the third lens on the optical axis meet the condition that T12 / T23 is greater than or equal to 12.10 and less than or equal to 14.81; the effective focal length f2 of the second lens, the interval EP12 between the first spacing element and the second spacing element along the optical axis direction, and the air interval T12 between the first lens and the second lens on the optical axis satisfy the following condition: 5.99 < = f2 / (EP12-T12) < = 6.63. The zoom lens compensation group solves the problem that the assembling stability and high image quality of the zoom lens compensation group in the prior art cannot be considered at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of optical imaging devices, and in particular to a zoom lens compensation group. Background Art

[0002] With the continuous improvement of the photography function of mobile devices, users have put forward higher requirements for the performance of mobile phone lenses, including but not limited to long focal length, large aperture and multi-zoom characteristics to achieve professional camera-level imaging effects. In a zoom lens, the compensation group is a lens combination located in the middle of the zoom lens after the fixed group. The compensation group consists of a group of lenses that can be moved forward or backward to adjust the position. Its main function is to compensate for the focal length so that the light can be correctly focused on the imaging surface. By moving the position of the compensation group, the focal length of the zoom lens can be adjusted to achieve close-up or long-distance shooting effects. However, when the light passes through the front end of the zoom lens compensation group, the path is difficult to control, and the height of the light changes greatly, which increases the difficulty of controlling field curvature and chromatic aberration, and also causes stray light and image quality to deteriorate. At the same time, the unreasonable spacing between the front lenses will also make the stability of the assembly process poor, resulting in an increased risk of reliability variation. Therefore, it is a very important issue to control the optical parameters of the front lens of the zoom lens compensation group to reduce aberrations and improve image quality while ensuring the stability of the assembly. Summary of the invention

[0003] The main purpose of the present invention is to provide a zoom lens compensation group to solve the problem in the prior art that the zoom lens compensation group cannot be both stable and high in image quality.

[0004] In order to achieve the above-mentioned object, according to one aspect of the present invention, a zoom lens compensation group is provided, wherein the number of lenses with optical power in the zoom lens compensation group is five, and the zoom lens compensation group comprises: a lens group, wherein the lens group comprises a first lens to a fifth lens arranged in sequence from the object side to the image side of the zoom lens compensation group; a spacer element group, wherein the spacer element group comprises at least a first spacer element located between the first lens and the second lens and at least partially in contact with the image side surface of the first lens, a second spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens, and a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens. A spacing element, a fourth spacing element located between the fourth lens and the fifth lens and at least partially in contact with the image side surface of the fourth lens; a lens barrel, a lens group and a spacing element group accommodated in the lens barrel; wherein, an air spacing T12 between the first lens and the second lens on the optical axis of the zoom lens compensation group, and an air spacing T23 between the second lens and the third lens on the optical axis satisfy: 12.10≤T12 / T23≤14.81; an effective focal length f2 of the second lens, an interval EP12 between the first spacing element and the second spacing element along the optical axis, and an air spacing T12 between the first lens and the second lens on the optical axis satisfy: 5.99≤f2 / (EP12-T12)≤6.63.

[0005] According to another aspect of the present invention, a zoom lens compensation group is further provided, wherein the number of lenses having optical power in the zoom lens compensation group is five, and the zoom lens compensation group comprises: a lens group, wherein the lens group comprises a first lens to a fifth lens arranged in sequence from the object side to the image side of the zoom lens compensation group; a spacer element group, wherein the spacer element group comprises at least a first spacer element located between the first lens and the second lens and at least partially in contact with the image side surface of the first lens, a second spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens, a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens, and a spacer element located between the fourth lens and the fourth lens and at least partially in contact with the image side surface of the third lens. A fourth spacing element between the fifth lens and at least partially in contact with the image side surface of the fourth lens; a lens barrel, a lens group and a spacing element group are accommodated in the lens barrel; wherein, the effective focal length f3 of the third lens, the center thickness CT3 of the third lens, the refractive index N3 of the third lens, and the interval EP23 between the second spacing element and the third spacing element along the optical axis satisfy: -4.94≤(f3*CT3*N3) / EP23≤-4.21; the interval EP34 between the third spacing element and the fourth spacing element along the optical axis, the maximum thickness CP4 of the fourth spacing element, and the center thickness CT4 of the fourth lens satisfy: 2.36≤EP34 / (CT4+CP4)≤2.71.

[0006] According to another aspect of the present invention, a zoom lens compensation group is further provided, wherein the number of lenses having optical focal length in the zoom lens compensation group is five, and the zoom lens compensation group comprises: a lens group, wherein the lens group comprises a first lens to a fifth lens arranged in sequence from the object side to the image side of the zoom lens compensation group; a spacer element group, wherein the spacer element group comprises at least a first spacer element located between the first lens and the second lens and at least partially in contact with the image side surface of the first lens, a second spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens, a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens, and a A fourth spacing element between the fourth lens and the fifth lens and at least partially in contact with the image side surface of the fourth lens; a lens barrel, a lens group and a spacing element group are accommodated in the lens barrel; wherein, the effective focal length f3 of the third lens, the interval EP23 between the second spacing element and the third spacing element along the optical axis, and the air interval T23 between the second lens and the third lens on the optical axis satisfy: -0.40≤f3 / (EP23-T23)≤-0.21; the curvature radius R4 of the image side surface of the second lens, the outer diameter D2s of the object side surface of the second spacing element, and the inner diameter d2s of the object side surface of the second spacing element satisfy: 12.52≤R4 / (D2s-d2s)≤17.05.

[0007] Furthermore, the outer diameter D0m of the image side end surface of the lens barrel, the inner diameter d0m of the image side end surface of the lens barrel, the outer diameter D0s of the object side end surface of the lens barrel, and the inner diameter d0s of the object side end surface of the lens barrel satisfy: 3.63≤(D0m-d0m) / (D0s-d0s)≤5.99.

[0008] Further, the effective focal length f1 of the first lens, the center thickness CT1 of the first lens, and the interval EP01 between the object side end surface of the lens barrel and the first spacing element along the optical axis direction satisfy: 14.22≤f1 / CT1+f1 / EP01≤22.55.

[0009] Further, an air interval T23 between the second lens and the third lens on the optical axis and a maximum thickness CP2 of the second spacing element satisfy: 8.99≤T23 / CP2≤12.11.

[0010] Further, the effective focal length f3 of the third lens, the center thickness CT3 of the third lens, the refractive index N3 of the third lens, and the interval EP23 between the second spacer element and the third spacer element along the optical axis satisfy: -4.94≤(f3*CT3*N3) / EP23≤-4.21.

[0011] Further, an effective focal length f4 of the fourth lens and an interval EP34 between the third spacing element and the fourth spacing element along the optical axis direction satisfy: 3.11≤f4 / EP34≤3.52.

[0012] Further, the interval EP34 between the third spacing element and the fourth spacing element along the optical axis direction, the maximum thickness CP4 of the fourth spacing element, and the center thickness CT4 of the fourth lens satisfy: 2.36≤EP34 / (CT4+CP4)≤2.71.

[0013] Furthermore, a curvature radius R2 of the image side surface of the first lens, an outer diameter D1s of the object side surface of the first spacing element, and an inner diameter d1s of the object side surface of the first spacing element satisfy: -47.70≤R2 / (D1s-d1s)≤-25.60.

[0014] Furthermore, a curvature radius R4 of the image side surface of the second lens, an outer diameter D2s of the object side surface of the second spacing element, and an inner diameter d2s of the object side surface of the second spacing element satisfy the following relationship: 12.52≤R4 / (D2s-d2s)≤17.05.

[0015] Furthermore, an outer diameter D2m of the image side surface of the second spacer element, an outer diameter D3s of the object side surface of the third spacer element, and a curvature radius R5 of the object side surface of the third lens satisfy: -3.84≤R5 / (D2m+D3s)≤-2.39.

[0016] Furthermore, the curvature radius R6 of the image side surface of the third lens, the refractive index N3 of the third lens, the outer diameter D3m of the image side surface of the third spacing element, and the inner diameter d3m of the image side surface of the third spacing element satisfy: 2.10≤R6*N3 / (D3m-d3m)≤3.06.

[0017] Further, the effective focal length f5 of the fifth lens, the center thickness CT5 of the fifth lens, the outer diameter D0m of the image side end surface of the lens barrel, and the inner diameter d0m of the image side end surface of the lens barrel satisfy: -13.97≤(f5 / CT5)*(D0m / d0m)≤-12.66.

[0018] Further, a curvature radius R8 of the image side surface of the fourth lens, an outer diameter D4s of the object side surface of the fourth spacing element, and an inner diameter d4s of the object side surface of the fourth spacing element satisfy: -5.79≤R8 / (D4s-d4s)≤-3.94.

[0019] Further, the first lens has positive optical power, the second lens has positive optical power, the third lens has negative optical power, the fourth lens has positive optical power, and the fifth lens has negative optical power.

[0020] Furthermore, the object side surface of the first lens is convex, the image side surface of the first lens is convex, the object side surface of the second lens is convex, the image side surface of the second lens is concave, the object side surface of the third lens is concave, the image side surface of the third lens is concave, the object side surface of the fourth lens is convex, and the image side surface of the fourth lens is convex; the object side surface of the fifth lens is convex, and the image side surface of the fifth lens is concave.

[0021] By applying the technical solution of the present invention, the zoom lens compensation group of the present application has five lenses with optical power, the zoom lens compensation group includes a lens group, a spacer element group and a lens barrel, the lens group from the object side to the image side of the zoom lens compensation group includes a first lens to a fifth lens arranged in sequence; the spacer element group includes at least a first spacer element located between the first lens and the second lens and at least partially in contact with the image side surface of the first lens, a second spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens, a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens, and a A fourth spacing element is between the fourth lens and the fifth lens and at least partially contacts the image side surface of the fourth lens; the lens group and the spacing element group are accommodated in the lens barrel; wherein, the air spacing T12 between the first lens and the second lens on the optical axis of the zoom lens compensation group, and the air spacing T23 between the second lens and the third lens on the optical axis satisfy: 12.10≤T12 / T23≤14.81; the effective focal length f2 of the second lens, the interval EP12 between the first spacing element and the second spacing element along the optical axis, and the air spacing T12 between the first lens and the second lens on the optical axis satisfy: 5.99≤f2 / (EP12-T12)≤6.63.

[0022] The zoom lens compensation group of the present application uses five lenses with optical power, and the first lens to the fifth lens are arranged in sequence and spaced apart. By controlling the focal length of the front lens and the spacing between different lenses or spacing elements, the light height in the zoom lens compensation group is reasonably controlled, and the path of the light inside the zoom lens compensation is effectively managed, ensuring that the light will not be over- or under-converged when entering the subsequent lens, thereby reducing field curvature and chromatic aberration, and improving the imaging quality of the zoom lens compensation. While ensuring the optical performance of the zoom lens compensation group, the assembly stability of the lens is also improved, greatly reducing the risk of reliability variation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0024] Figure 1 A schematic diagram showing some parameters of a zoom lens compensation group of any optional embodiment of the present invention;

[0025] Figure 2 A schematic structural diagram of a zoom lens compensation group according to the first embodiment of the present invention is shown;

[0026] Figure 3 A schematic structural diagram of a zoom lens compensation group according to a second embodiment of the present invention is shown;

[0027] Figure 4 A schematic diagram showing the structure of a zoom lens compensation group according to a third embodiment of the present invention is shown;

[0028] Figure 5 A schematic structural diagram of a zoom lens compensation group according to a fourth embodiment of the present invention is shown;

[0029] Figure 6 A schematic diagram showing the structure of a zoom lens compensation group according to a fifth embodiment of the present invention is shown;

[0030] Figure 7 A schematic diagram showing the structure of a zoom lens compensation group according to a sixth embodiment of the present invention is shown;

[0031] Figure 8 A schematic structural diagram of a zoom lens compensation group according to a seventh embodiment of the present invention is shown;

[0032] Fig. 9 A schematic structural diagram of a zoom lens compensation group according to an eighth embodiment of the present invention is shown;

[0033] Fig.10 A schematic structural diagram of a zoom lens compensation group according to Embodiment 9 of the present invention is shown;

[0034] Fig.11 A schematic structural diagram of a zoom lens compensation group according to a tenth embodiment of the present invention is shown;

[0035] Fig.12 A schematic diagram showing the structure of a zoom lens compensation group according to an eleventh embodiment of the present invention is shown;

[0036] Fig.13 A schematic structural diagram of a zoom lens compensation group according to a twelfth embodiment of the present invention is shown;

[0037] Fig.14 A displacement cloud diagram of a compensation group of a zoom lens in any optional embodiment of the present invention before being compressed is shown;

[0038] Fig.15 A displacement cloud diagram of a zoom lens compensation group after being compressed in any optional embodiment of the present invention is shown;

[0039] Fig.16 A stress cloud diagram of a zoom lens compensation group before being compressed in any optional embodiment of the present invention is shown;

[0040] Fig.17 A stress cloud diagram of the zoom lens compensation group after being compressed in any optional embodiment of the present invention is shown.

[0041] The above drawings include the following reference numerals:

[0042] P0, lens barrel; E1, first lens; P1, first spacing element; E2, second lens; P2, second spacing element; E3, third lens; P3, third spacing element; E4, fourth lens; P4, fourth spacing element; E5, fifth lens; S1, object-side surface of the first lens; S2, image-side surface of the first lens; S3, object-side surface of the second lens; S4, image-side surface of the second lens; S5, object-side surface of the third lens; S6, image-side surface of the third lens; S7, object-side surface of the fourth lens; S8, image-side surface of the fourth lens; S9, object-side surface of the fifth lens; S10, image-side surface of the fifth lens. DETAILED DESCRIPTION

[0043] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0044] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0045] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0046] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0047] In this article, the paraxial area refers to the area 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 area; 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 area. The judgment of the surface shape in the paraxial area can be based on the judgment method of ordinary knowledgeable people in this field, and the positive and negative R value (R refers to the radius of curvature of the paraxial area, usually refers to the R value on the lens database (lens data) in the optical software) is used to judge the convexity and concavity. For the eye-side surface, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; for the display-side surface, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface.

[0048] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0049] In order to solve the problem in the prior art that it is impossible to take into account both the assembly stability and high image quality of a zoom lens compensation group while maintaining high performance, the present invention provides a zoom lens compensation group.

[0050] First embodiment

[0051] like Figures 1 to 17 As shown, the number of lenses with optical power in the zoom lens compensation group is five, the zoom lens compensation group includes a lens group, a spacer element group and a lens barrel, the lens group from the object side to the image side of the zoom lens compensation group includes a first lens to a fifth lens arranged in sequence; the spacer element group includes at least a first spacer element located between the first lens and the second lens and at least partially in contact with the image side surface of the first lens, a second spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens, a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens, and a fourth spacer element located between the fourth lens and the fourth lens and at least partially in contact with the image side surface of the third lens. A fourth spacing element is provided between the five lenses and at least partially contacts the image side surface of the fourth lens; the lens group and the spacing element group are accommodated in the lens barrel; wherein, the air spacing T12 between the first lens and the second lens on the optical axis of the zoom lens compensation group, and the air spacing T23 between the second lens and the third lens on the optical axis satisfy: 12.10≤T12 / T23≤14.81; the effective focal length f2 of the second lens, the spacing EP12 between the first spacing element and the second spacing element along the optical axis, and the air spacing T12 between the first lens and the second lens on the optical axis satisfy: 5.99≤f2 / (EP12-T12)≤6.63.

[0052] The zoom lens compensation group of the present application uses five lenses with optical power, and the first lens to the fifth lens are arranged in sequence and spaced apart. By controlling the focal length of the front lens and the spacing between different lenses or spacing elements, the light height in the zoom lens compensation group is reasonably controlled, and the path of the light inside the zoom lens compensation is effectively managed, ensuring that the light will not be over- or under-converged when entering the subsequent lens, thereby reducing field curvature and chromatic aberration, and improving the imaging quality of the zoom lens compensation. While ensuring the optical performance of the zoom lens compensation group, the assembly stability of the lens is also improved, greatly reducing the risk of reliability variation.

[0053] Table 1 below shows a comparison of the resolution changes of a zoom lens compensation group after the assembly is compressed, in an optional embodiment of the present application and in the prior art.

[0054]

[0055] Table 1

[0056] It should be noted that the resolution can be intuitively evaluated through MTF analysis to examine the performance of the zoom lens compensation group at different spatial frequencies. The shape and height of the MTF curve reflect the ability of the zoom lens compensation group to transmit different details. When the absolute value of MTF in Table 1 is less than 4%, the resolution meets the judgment standard. Under the premise that the value of T12 / T23 is too large, the propagation path of the light between the first lens and the second lens is too long, and the excessive air gap affects the compactness and stability of the entire zoom lens compensation group. At this time, the value of f2 / (EP12-T12) is too large, resulting in insufficient focusing of the light by the second lens, and the zoom performance of the zoom lens compensation group is reduced; the value of f2 / (EP12-T12) is too small, and the light is over-converged after entering the second lens, which leads to an excessively large incident angle of the light at the third lens, affecting the performance of the third lens, that is, the absolute value of MTF of lens group 4 and lens group 6 does not meet the judgment standard. In addition, under the premise that the value of T12 / T23 is too small, the smaller air gap limits the movement range of the second lens, affecting the zoom performance. At this time, the MTF absolute value of lens group 7 with an excessively large value of f2 / (EP12-T12) or lens group 9 with an excessively small value of f2 / (EP12-T12) also does not meet the judgment criteria.

[0057] By limiting at least one of T12 / T23 and f2 / (EP12-T12) within a reasonable range, the resolution can be effectively improved, and while ensuring the performance of the zoom lens compensation group, the assembly stability of the zoom lens compensation group can be improved, aberrations can be reduced, and the imaging quality can be improved. In particular, the performance of the zoom lens compensation group at different focal lengths can be optimized to achieve the goals of high performance and high reliability. For example, lens group 1 and lens group 3 that meet 12.10≤T12 / T23≤14.81, or lens group 5 and lens group 8 that meet 5.99≤f2 / (EP12-T12)≤6.63, can also meet the resolution standard. Furthermore, as shown in lens group 2, the values ​​of T12 / T23 and f2 / (EP12-T12) can be limited to be within the scope of this application.

[0058] like Figures 14 to 17 As shown, Fig.14 and Fig.15 They are respectively the displacement cloud diagrams of the zoom lens compensation group of an optional embodiment of the present invention before and after being subjected to force, Fig.16 and Fig.17 The stress cloud diagrams of the zoom lens compensation group before and after the force is applied are respectively shown in an optional embodiment of the present invention. By reasonably setting the range of T12 / T23 and f2 / (EP12-T12), the zoom lens compensation group has good assembly stability, avoiding excessive concentration of stress on a certain position of the lens or the lens barrel, and the force deformation of the lens and the lens barrel can be effectively controlled, thereby enhancing the structural stability of the zoom lens compensation group and avoiding the influence on the focal length change performance.

[0059] In this embodiment, the outer diameter D0m of the image side end surface of the lens barrel, the inner diameter d0m of the image side end surface of the lens barrel, the outer diameter D0s of the object side end surface of the lens barrel, and the inner diameter d0s of the object side end surface of the lens barrel satisfy the following relationship: 3.63≤(D0m-d0m) / (D0s-d0s)≤5.99. If the value of (D0m-d0m) / (D0s-d0s) is too large, this indicates that the difference between the outer diameter and the inner diameter of the image side end surface of the lens barrel is larger than the difference between the outer diameter and the inner diameter of the object side end surface of the lens barrel, resulting in the interior of the lens barrel being too tight, and the light angle of the edge field of view cannot be effectively controlled, increasing the manufacturing difficulty of the zoom lens compensation group and the risk of optical path deviation. If the value of (D0m-d0m) / (D0s-d0s) is too small, the difference between the outer diameter and the inner diameter of the image side end face of the lens barrel is small, resulting in insufficient edge light angles, affecting the imaging quality of the zoom lens compensation group for the edge field of view, and reducing the tolerance of the zoom lens compensation group to manufacturing tolerances. By controlling (D0m-d0m) / (D0s-d0s) within a reasonable range, it is possible to ensure that the light angle of the edge field of view is reasonable, improve the tolerance of the zoom lens compensation group, and help the zoom lens compensation group maintain good assembly stability and reliability while maintaining high performance.

[0060] In this embodiment, the effective focal length f1 of the first lens, the center thickness CT1 of the first lens, and the interval EP01 between the object side end face of the lens barrel and the first spacing element along the optical axis direction satisfy: 14.22≤f1 / CT1+f1 / EP01≤22.55. If the value of f1 / CT1+f1 / EP01 is too large, the effective focal length of the first lens is too large relative to the center thickness of the first lens and the object side end face of the lens barrel, resulting in excessive reduction in the thickness of the first lens or the size of the object side end face of the lens barrel, affecting the structural strength of the zoom lens compensation group and the structural stability of the lens barrel. If the value of f1 / CT1+f1 / EP01 is too small, the effective focal length of the first lens is relatively small, which does not match the center thickness of the first lens and the object side end face of the lens barrel, resulting in insufficient convergence of light in the first lens, reducing the telephoto performance. By controlling f1 / CT1+f1 / EP01 within a reasonable range, the optical power of the first lens and the size of the object side end face of the lens barrel can be reasonably controlled, ensuring that while optimizing the small volume advantage of the zoom lens compensation group, its telephoto characteristics are maintained, thereby improving the imaging quality of the zoom lens compensation group.

[0061] In this embodiment, the air interval T23 between the second lens and the third lens on the optical axis and the maximum thickness CP2 of the second spacing element satisfy: 8.99≤T23 / CP2≤12.11. If the value of T23 / CP2 is too large, the relative position of the third lens on the optical axis is difficult to control. If the value of T23 / CP2 is too small, the normal propagation of light between the second lens and the third lens is disturbed, affecting the optimization of the optical path. By controlling T23 / CP2 within a reasonable range, the relative position of the third lens on the optical axis can be ensured, the light is optimized to enter the third lens and the fourth lens along the established optical path, and the imaging quality of the zoom lens compensation group can be ensured.

[0062] In this embodiment, the effective focal length f3 of the third lens, the center thickness CT3 of the third lens, the refractive index N3 of the third lens, and the interval EP23 between the second spacer element and the third spacer element along the optical axis direction satisfy: -4.94≤(f3*CT3*N3) / EP23≤-4.21. If the value of (f3*CT3*N3) / EP23 is too large, the structural part of the third lens is too thick, which affects the propagation efficiency of light in the zoom lens compensation group and increases the volume of the zoom lens compensation group. If the value of (f3*CT3*N3) / EP23 is too small, the structural part of the third lens is too thin, which reduces the structural strength of the third lens and may affect the normal incidence of light on the fourth lens, affecting imaging. By controlling (f3*CT3*N3) / EP23 within a reasonable range, it is ensured that the third lens has sufficient structural strength, thereby improving the assembly stability of the zoom lens compensation group, and planning the optical path through the third lens to ensure that the light is incident on the fourth lens along the predetermined optical path, thereby ensuring the imaging quality of the zoom lens compensation group.

[0063] In this embodiment, the effective focal length f4 of the fourth lens and the interval EP34 between the third spacing element and the fourth spacing element along the optical axis satisfy: 3.11≤f4 / EP34≤3.52. If the value of f4 / EP34 is too large, the relative position of the fourth lens on the optical axis is unstable, affecting the imaging quality of the zoom lens compensation group. If the value of f4 / EP34 is too small, the mismatch between f4 and EP34 leads to poor focusing effect of light on the fourth lens, and ultimately the imaging quality is reduced. By controlling f4 / EP34 within a reasonable range, the relative position of the fourth lens on the optical axis can be ensured, the length of the zoom lens compensation group can be controlled, and the imaging quality can be optimized.

[0064] In this embodiment, the interval EP34 between the third spacing element and the fourth spacing element along the optical axis, the maximum thickness CP4 of the fourth spacing element, and the center thickness CT4 of the fourth lens satisfy the following relationship: 2.36≤EP34 / (CT4+CP4)≤2.71. If the value of EP34 / (CT4+CP4) is too large, the length of the zoom lens compensation group will increase, making it difficult to achieve a small volume design. If the value of EP34 / (CT4+CP4) is too small, the assembly stability of the fourth lens is poor, resulting in inaccurate control of the axial dimension of the light from the fourth lens to the fifth lens, affecting imaging. By controlling EP34 / (CT4+CP4) within a reasonable range, the assembly stability of the fourth lens can be improved, thereby controlling the axial dimension of the fourth lens to the fifth lens and reducing the volume of the zoom lens compensation group.

[0065] In this embodiment, the radius of curvature R2 of the image side surface of the first lens, the outer diameter D1s of the object side surface of the first spacer element, and the inner diameter d1s of the object side surface of the first spacer element satisfy the following conditions: -47.70≤R2 / (D1s-d1s)≤-25.60. If the value of R2 / (D1s-d1s) is too large, the diffusion degree of light in the first lens will be insufficient, affecting the optimization of the subsequent optical path. If the value of R2 / (D1s-d1s) is too small, the radius of curvature of the image side surface of the first lens is not designed properly, resulting in excessive diffusion of light in the first lens, increasing stray light and affecting the imaging quality. By controlling R2 / (D1s-d1s) within a reasonable range, the imaging quality of the zoom lens compensation group can be improved, and the assembly stability of the zoom lens compensation group can be improved.

[0066] In this embodiment, the radius of curvature R4 of the image side surface of the second lens, the outer diameter D2s of the object side surface of the second spacer element, and the inner diameter d2s of the object side surface of the second spacer element satisfy the following relationship: 12.52≤R4 / (D2s-d2s)≤17.05. If the value of R4 / (D2s-d2s) is too large, the angle of the outgoing light will be excessively diffused, increasing the size of the zoom lens compensation group and the risk of stray light. If the value of R4 / (D2s-d2s) is too small, the light will not be sufficiently focused at the second lens, affecting the subsequent optimization of the optical path and the imaging quality. By controlling R4 / (D2s-d2s) within a reasonable range, the angle of the light path can be improved, the optical performance of the focal lens compensation group can be improved, and the size of the zoom lens compensation group can be reduced while controlling the outgoing light from the second lens.

[0067] In this embodiment, the outer diameter D2m of the image side surface of the second spacer element, the outer diameter D3s of the object side surface of the third spacer element, and the curvature radius R5 of the object side surface of the third lens satisfy: -3.84≤R5 / (D2m+D3s)≤-2.39. If the value of R5 / (D2m+D3s) is too large, the light will be insufficiently focused at the third lens, affecting the light incident on the fourth lens along the established optical path, and at the same time causing the structural strength of the third lens to decrease. If the value of R5 / (D2m+D3s) is too small, the light will be over-focused at the third lens, affecting the optimization of the subsequent optical path. By controlling R5 / (D2m+D3s) within a reasonable range, the control of the ghost image of the third lens by the zoom lens compensation group can be optimized, while ensuring the amount of light passing through the zoom lens compensation group. By controlling it, the performance of the zoom lens compensation group can be ensured while optimizing the ghost image.

[0068] In this embodiment, the radius of curvature R6 of the image side surface of the third lens, the refractive index N3 of the third lens, the outer diameter D3m of the image side surface of the third spacer element, and the inner diameter d3m of the image side surface of the third spacer element satisfy the following conditions: 2.10≤R6*N3 / (D3m-d3m)≤3.06. If the value of R6*N3 / (D3m-d3m) is too large, stray light increases, affecting the image clarity. If the value of R6*N3 / (D3m-d3m) is too small, the radius of curvature of the image side surface of the third lens is not reasonably designed, that is, it does not match the size of the third spacer element, affecting the yield and processability of the third lens, while increasing unnecessary stray light. By controlling R6*N3 / (D3m-d3m) within a reasonable range, the yield and processability of the third lens can be improved. At the same time, by optimizing the outer diameter and inner diameter of the image side surface of the third spacer element, the risk of stray light can be effectively reduced, and the imaging quality of the zoom lens compensation group can be improved.

[0069] In this embodiment, the effective focal length f5 of the fifth lens, the center thickness CT5 of the fifth lens, the outer diameter D0m of the image side end surface of the lens barrel, and the inner diameter d0m of the image side end surface of the lens barrel satisfy: -13.97≤(f5 / CT5)*(D0m / d0m)≤-12.66. If the value of (f5 / CT5)*(D0m / d0m) is too large, the light will not converge sufficiently at the fifth lens, affecting the resolution and overall focal length of the zoom lens compensation group. If the value of (f5 / CT5)*(D0m / d0m) is too small, the effective focal length of the fifth lens, the center thickness of the fifth lens, and the size of the image side end surface of the lens barrel do not match, resulting in excessive light convergence at the fifth lens, affecting the imaging quality. By controlling (f5 / CT5)*(D0m / d0m) within a reasonable range, the fifth lens can be ensured to be in an accurate position on the optical axis, while the size of the zoom lens compensation group and the number of outgoing light rays can be controlled, thereby ensuring the resolution and optical performance of the zoom lens compensation group.

[0070] In this embodiment, the curvature radius R8 of the image side surface of the fourth lens, the outer diameter D4s of the object side surface of the fourth spacer element, and the inner diameter d4s of the object side surface of the fourth spacer element satisfy: -5.79≤R8 / (D4s-d4s)≤-3.94. If the value of R8 / (D4s-d4s) is too large, the angle of the outgoing light will be excessively concentrated or diffused, increasing the size of the zoom lens compensation group and the risk of stray light. If the value of R8 / (D4s-d4s) is too small, the curvature radius of the image side surface of the fourth lens is not reasonably designed, resulting in insufficient focusing of the light on the fourth lens, affecting the optimization of the subsequent optical path and the imaging quality. By controlling R8 / (D4s-d4s) within a reasonable range, the imaging quality of the zoom lens compensation group can be improved. At the same time, adjusting the outer diameter of the object side of the fourth spacer element can control the outer diameter of the fifth lens, which is beneficial to reducing the size of the zoom lens compensation group. Adjusting the inner diameter of the object side of the fourth spacer element can intercept excess light and prevent stray light from being reflected on the inner side of the lens barrel. The size of the zoom lens compensation group can be controlled while avoiding stray light, thereby improving imaging quality.

[0071] In this embodiment, the first lens has positive focal power, the second lens has positive focal power, the third lens has negative focal power, the fourth lens has positive focal power, and the fifth lens has negative focal power. The first lens, the second lens, and the fourth lens have positive focal power, and the third lens and the fifth lens have negative focal power, which can ensure the reasonable order of light rays converging first and then diverging in the lens group, optimize the propagation path of the light beam at different focal lengths, reduce aberrations such as field curvature and chromatic aberration, improve imaging quality, and meet the requirements of miniaturization and high reliability of the zoom lens compensation group.

[0072] In this embodiment, the object side surface of the first lens is convex, the image side surface of the first lens is convex, the object side surface of the second lens is convex, the image side surface of the second lens is concave, the object side surface of the third lens is concave, the image side surface of the third lens is concave, the object side surface of the fourth lens is convex, and the image side surface of the fourth lens is convex; the object side surface of the fifth lens is convex, and the image side surface of the fifth lens is concave. The surface shape of the lens set as above can ensure that the light is reasonably refracted and reflected in the zoom lens compensation group, optimize the focusing and divergence of the light, reduce chromatic aberration and field curvature, and improve the imaging clarity. In addition, the surface shape setting of the lens also helps to control the light angle of the edge field of view, which is beneficial to the imaging of the edge field of view by the zoom lens compensation group, while improving the assembly stability of the zoom lens compensation group, reducing the risk of reliability variation, and ensuring that the zoom lens compensation group has high performance while achieving small size and high reliability.

[0073] Optionally, the zoom lens compensation group in the embodiment of the present application can be simulated by software and / or tools such as ZEMAX, CODEV, etc. Optionally, the zoom lens compensation group can be simulated by CODEV software. In the process of using the above software and / or tools for simulation, the surface shape of each lens surface can be appropriately adjusted according to the surface shape of the software and / or tool used.

[0074] In this embodiment, each lens can be selected as a trimmed lens. The outer diameter surface of the trimmed lens has a trimmed structure and a non-trimmed structure, and the outer diameter of the trimmed structure is smaller than the outer diameter of the non-trimmed structure. The outer diameter of the trimmed lens usually refers to the outer diameter of the non-trimmed structure.

[0075] In this embodiment, each spacer element can be selected as a trimming spacer element. The outer annular surface of the trimming spacer element has a trimming portion and a non-trimming portion, and the outer diameter of the trimming portion is smaller than the outer diameter of the non-trimming portion. The outer diameter of the trimming spacer element usually refers to the maximum outer diameter of the non-trimming portion.

[0076] Second embodiment

[0077] According to another aspect of the present invention, a zoom lens compensation group is further provided. The number of lenses with optical power in the zoom lens compensation group is five. The zoom lens compensation group includes a lens group, a spacer element group and a lens barrel. From the object side to the image side of the zoom lens compensation group, the lens group includes a first lens to a fifth lens arranged in sequence and spaced apart; the spacer element group includes at least a first spacer element located between the first lens and the second lens and at least partially in contact with the image side surface of the first lens, a second spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens, a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens, and a A fourth spacing element is between the lens and the fifth lens and is in at least partial contact with the image side surface of the fourth lens; the lens group and the spacing element group are accommodated in the lens barrel; wherein, the effective focal length f3 of the third lens, the center thickness CT3 of the third lens, the refractive index N3 of the third lens, and the interval EP23 between the second spacing element and the third spacing element along the optical axis satisfy: -4.94≤(f3*CT3*N3) / EP23≤-4.21; the interval EP34 between the third spacing element and the fourth spacing element along the optical axis, the maximum thickness CP4 of the fourth spacing element, and the center thickness CT4 of the fourth lens satisfy: 2.36≤EP34 / (CT4+CP4)≤2.71.

[0078] The zoom lens compensation group of the present application uses five lenses with optical focal lengths, and the first lens to the fifth lens are arranged in sequence and spaced apart. By controlling (f3*CT3*N3) / EP23 within a reasonable range, the third lens has sufficient structural strength to avoid the problem of unstable assembly. At the same time, the focusing effect of the third lens on the light beam is optimized, so as to better control the field curvature and chromatic aberration, especially in the zooming process, to ensure the imaging quality of the zoom lens compensation group at different focal lengths. Coordinating the center thickness of the third lens and the spacing between the second spacing element and the third spacing element along the optical axis helps to reduce stray light and image quality degradation caused by lens displacement during zooming, and improves the imaging clarity and contrast of the zoom lens compensation group. However, this situation easily leads to a larger volume of the third lens, which makes the zoom lens compensation group too large or increases in weight. By controlling EP34 / (CT4+CP4) within a reasonable range, the center thickness, edge thickness of the fourth lens and the distance between the fourth lens and the fifth lens can be reasonably controlled to balance with the third lens, thereby optimizing the overall size and weight of the zoom lens compensation group. At the same time, the shape of each lens is avoided from being in an extreme design, reducing the risk of shaking after assembly and improving the stability of the zoom lens compensation group.

[0079] This embodiment also includes other conditional expressions in the above embodiment, which will not be described in detail here.

[0080] Third embodiment

[0081] According to another aspect of the present invention, a zoom lens compensation group is provided. The number of lenses with optical power in the zoom lens compensation group is five. The zoom lens compensation group includes a lens group, a spacer element group and a lens barrel. From the object side to the image side of the zoom lens compensation group, the lens group includes a first lens to a fifth lens arranged in sequence; the spacer element group includes at least a first spacer element located between the first lens and the second lens and at least partially in contact with the image side surface of the first lens, a second spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens, and a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens. , a fourth spacing element located between the fourth lens and the fifth lens and at least partially in contact with the image side surface of the fourth lens; the lens group and the spacing element group are accommodated in the lens barrel; wherein, the effective focal length f3 of the third lens, the interval EP23 between the second spacing element and the third spacing element along the optical axis, and the air interval T23 between the second lens and the third lens on the optical axis satisfy: -0.40≤f3 / (EP23-T23)≤-0.21; the curvature radius R4 of the image side surface of the second lens, the outer diameter D2s of the object side surface of the second spacing element, and the inner diameter d2s of the object side surface of the second spacing element satisfy: 12.52≤R4 / (D2s-d2s)≤17.05.

[0082] The zoom lens compensation group of the present application uses five lenses with optical focal length, and the first lens to the fifth lens are arranged in sequence and spaced apart. By controlling f3 / (EP23-T23) within a certain range, the stable position of the third lens on the optical axis can be ensured, the shaking of the zoom lens compensation group during assembly and zooming can be reduced, and the reliability and service life of the zoom lens compensation group can be improved. In addition, the reasonable setting of f3 / (EP23-T23) helps to control the focusing effect of the third lens on the light. However, in this case, the internal stray light energy of the zoom lens compensation group is strong, and the imaging quality is reduced. By controlling R4 / (D2s-d2s) within a reasonable range, the light path angle can be improved, the optical performance of the focal lens compensation group can be improved, and the second spacing element can be combined to intercept the edge stray light, further reducing the aberration of the zoom lens compensation group.

[0083] It should be noted that this embodiment also includes other conditional expressions in the above embodiment, which will not be described one by one here.

[0084] The zoom lens compensation group in the present application may use multiple lenses, such as the five lenses mentioned above. In the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The characteristics of an aspherical lens are: the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After using an aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality.

[0085] 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 zoom lens compensation group can be changed to obtain the various results and advantages described in this specification. For example, although five lenses are described as an example in the embodiments, the zoom lens compensation group is not limited to including five lenses. If necessary, the zoom lens compensation group may also include other numbers of lenses.

[0086] Figure 1 A schematic diagram of the dimensions of a zoom lens compensation group of the present application is shown. Figure 1 Parameters such as d1s, D2s, CP2, and EP34 are marked in the figure to clearly and intuitively understand the meaning of the parameters. In order to facilitate the description of the zoom lens compensation group and the surface shape of the specific lens, these parameters will no longer be reflected in the drawings when describing the specific embodiments later.

[0087] The following further describes examples of specific surface shapes and parameters of the zoom lens compensation group applicable to the above-mentioned embodiment with reference to the accompanying drawings.

[0088] It should be noted that any one of the following embodiments 1 to 12 is applicable to all embodiments of the present application.

[0089] Embodiment 1

[0090] like Figure 2 As shown, the zoom lens compensation group of the first embodiment of the present application is described. Figure 2 A schematic structural diagram of a zoom lens compensation group of the first embodiment is shown.

[0091] like Figure 2 As shown, the zoom lens compensation group includes, from the object side to the image side, a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a third lens E3, a third spacing element P3, a fourth lens E4, a fourth spacing element P4, and a fifth lens E5.

[0092] In this embodiment, there are two spacer elements between the first lens E1 and the second lens E2, which are supported on the image side of the first spacer element P1; there are two spacer elements between the third lens E3 and the fourth lens E4, which are supported on the image side of the third spacer element P3; there are two spacer elements between the fourth lens E4 and the fifth lens E5, which are supported on the image side of the fourth spacer element P4. While ensuring stable support, the spacing between adjacent lenses is controlled by using thicker spacer elements to meet imaging requirements, and the smaller inner diameter of thinner spacer elements is used to intercept stray light and improve edge imaging effects. In addition, the image side end of the lens barrel P0 has a support section extending toward the optical axis for the image side of the fifth lens E5 to support. That is to say, the zoom lens compensation group of this embodiment is assembled in order from the fifth lens E5 to the first lens E1.

[0093] In this embodiment, the first lens E1 has 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 convex. The second lens E2 has positive 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 negative focal power, the object side surface S5 of the third lens is concave, and the image side surface S6 of the third lens is concave. The fourth lens E4 has positive focal power, the object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is convex. The fifth lens E5 has negative focal power, the object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is concave.

[0094] Table 2 shows the basic structural parameters of the zoom lens compensation group of the first embodiment, wherein the units of the curvature radius, thickness / distance, effective radius and focal length are all millimeters (mm).

[0095] Face number Surface type Radius of curvature thickness Refractive Index Abbe number Cone coefficient S1 Aspheric 13.8696 1.9000 1.55 56.1 1.1366 S2 Aspheric -67.4236 3.2219 99.0000 S3 Aspheric 5.1522 1.5566 1.55 56.1 -0.5427 S4 Aspheric 44.9545 0.1107 99.0000 STO Spherical endless 0.1556 S5 Aspheric -44.0358 0.5729 1.68 19.2 -11.6404 S6 Aspheric 5.6503 3.2400 0.0677 S7 Aspheric 13.9211 1.3125 1.68 19.2 0.1607 S8 Aspheric -16.1862 2.3239 7.9067 S9 Aspheric 20.7880 1.6500 1.62 25.9 52.7037 S10 Aspheric 5.7313 1.6165 0.4469

[0096] Table 2

[0097] In the first embodiment, the object side surface and the image side surface of any lens from the first lens E1 to the fifth lens E5 are both aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0098]

[0099] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 2 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 3 below gives the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspheric mirror surface S1-S10 in Example 1.

[0100] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -1.7078E-04 1.2684E-05 1.9790E-07 -1.2789E-07 4.4485E-09 8.5942E-10 -1.1623E-10 5.6920E-12 -1.0456E-13 S2 -5.1984E-04 4.1057E-05 3.0212E-06 -1.2898E-06 1.8465E-07 -1.5696E-08 8.0286E-10 -2.2571E-11 2.6254E-13 S3 -9.1806E-04 -2.8577E-04 2.4996E-04 -9.6968E-05 2.2041E-05 -3.0529E-06 2.5160E-07 -1.1300E-08 2.1269E-10 S4 8.4086E-04 -2.6453E-03 2.0496E-03 -8.7157E-04 2.1992E-04 -3.3767E-05 3.0927E-06 -1.5523E-07 3.2850E-09 S5 1.7257E-03 -1.8963E-03 1.3633E-03 -5.8396E-04 1.5174E-04 -2.4101E-05 2.2840E-06 -1.1861E-07 2.5984E-09 S6 -1.5029E-04 -5.9903E-04 5.6037E-04 -2.8802E-04 9.0106E-05 -1.7170E-05 1.9453E-06 -1.2078E-07 3.1737E-09 S7 -1.5649E-03 2.0394E-04 -3.4866E-05 4.7480E-06 -2.9838E-07 -1.7159E-08 4.9628E-09 -4.1309E-10 1.3870E-11 S8 -1.9996E-03 2.7437E-04 -3.6377E-05 2.0110E-06 5.6838E-07 -1.5575E-07 1.7588E-08 -1.0211E-09 2.5515E-11 S9 -5.8935E-03 6.2362E-04 -2.8657E-04 1.5996E-04 -6.0554E-05 1.4167E-05 -1.9909E-06 1.5396E-07 -5.0639E-09 S10 -5.0955E-03 5.0177E-04 -6.1327E-05 5.5554E-06 6.3493E-07 -3.2086E-07 4.8028E-08 -3.3812E-09 9.4892E-11

[0101] Table 3

[0102] Embodiment 2

[0103] like Figure 3 As shown, the zoom lens compensation group of the second embodiment of the present application is described, which is different from the first embodiment in that the distances and thicknesses between the spacer elements, lenses, lens barrel P0, etc. are different.

[0104] Figure 3 The structure diagram of the zoom lens compensation group of the second embodiment is shown. For the sake of brevity, some descriptions similar to those of the first embodiment are omitted. In this embodiment, the wall thickness of the lens barrel is relatively uniform, which is conducive to reducing the volume of the zoom lens compensation group.

[0105] Embodiment 3

[0106] like Figure 4 As shown, the zoom lens compensation group of the third embodiment of the present application is described, which is different from the first embodiment in that the distances and thicknesses between the spacer elements, lenses, lens barrel P0, etc. are different.

[0107] Figure 4 The structure diagram of the zoom lens compensation group of the third embodiment is shown. For the sake of brevity, some descriptions similar to those of the first embodiment are omitted. In this embodiment, the length of the structural part of each lens is small, the width of the ring belt of the matching spacer element is small, and the wall thickness of the lens barrel is relatively uniform, which is conducive to controlling the miniaturization of the zoom lens compensation group.

[0108] Embodiment 4

[0109] like Figure 5 As shown, the zoom lens compensation group of the fourth embodiment of the present application is described. Figure 5 A schematic structural diagram of a zoom lens compensation group of the fourth embodiment is shown.

[0110] like Figure 5 As shown, the zoom lens compensation group includes, from the object side to the image side, a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a third lens E3, a third spacing element P3, a fourth lens E4, a fourth spacing element P4, and a fifth lens E5.

[0111] In this embodiment, there are two spacer elements between the first lens E1 and the second lens E2, which are supported on the image side of the first spacer element P1; there are two spacer elements between the third lens E3 and the fourth lens E4, which are supported on the image side of the third spacer element P3; there are two spacer elements between the fourth lens E4 and the fifth lens E5, which are supported on the image side of the fourth spacer element P4. While ensuring stable support, the spacing between adjacent lenses is controlled by using thicker spacer elements to meet imaging requirements, and the smaller inner diameter of thinner spacer elements is used to intercept stray light and improve edge imaging effects. In addition, the image side end of the lens barrel P0 has a support section extending toward the optical axis for the image side of the fifth lens E5 to support. That is to say, the zoom lens compensation group of this embodiment is assembled in order from the fifth lens E5 to the first lens E1.

[0112] In this embodiment, the first lens E1 has 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 convex. The second lens E2 has positive 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 negative focal power, the object side surface S5 of the third lens is concave, and the image side surface S6 of the third lens is concave. The fourth lens E4 has positive focal power, the object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is convex. The fifth lens E5 has negative focal power, the object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is concave.

[0113] Table 4 shows the basic structural parameters of the zoom lens compensation group of the fourth embodiment, wherein the units of the curvature radius, thickness / distance, effective radius and focal length are all millimeters (mm).

[0114] Face number Surface type Radius of curvature thickness Refractive Index Abbe number Cone coefficient S1 Aspheric 13.7853 3.0000 1.55 56.1 0.9232 S2 Aspheric -71.4451 2.8263 99.0000 S3 Aspheric 5.0944 1.5011 1.55 56.1 -0.5124 S4 Aspheric 45.8842 0.123 99.0000 STO Spherical endless 0.0954 S5 Aspheric -66.9883 0.5682 1.68 19.2 -26.7574 S6 Aspheric 5.3185 3.2432 0.1038 S7 Aspheric 14.1139 1.2504 1.68 19.2 0.5559 S8 Aspheric -15.8121 2.2239 7.9441 S9 Aspheric 20.5593 1.8332 1.62 25.9 51.9362 S10 Aspheric 5.8460 1.9017 0.3809

[0115] Table 4

[0116] Table 5 shows the high-order coefficients that can be used for each aspherical mirror surface in the embodiment, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the above embodiment 1. In this embodiment, the object side surface and the image side surface of the first lens to the fifth lens are all aspherical surfaces.

[0117]

[0118]

[0119] Table 5

[0120] Embodiment 5

[0121] like Figure 6As shown, the zoom lens compensation group of the fifth embodiment of the present application is described, which is different from the fourth embodiment in that the distances and thicknesses between the spacer elements, lenses, lens barrel P0, etc. are different.

[0122] Figure 6 The structure diagram of the zoom lens compensation group of the fifth embodiment is shown. For the sake of brevity, some descriptions similar to those of the fourth embodiment are omitted. In this embodiment, the wall thickness of the lens barrel is relatively uniform, which is conducive to reducing the volume of the zoom lens compensation group.

[0123] Embodiment 6

[0124] like Figure 7 As shown, the zoom lens compensation group of the sixth embodiment of the present application is described, which is different from the fourth embodiment in that the distances and thicknesses between the spacer elements, lenses, lens barrel P0, etc. are different.

[0125] Figure 7 The structure diagram of the zoom lens compensation group of the sixth embodiment is shown. For the sake of brevity, some descriptions similar to those of the fourth embodiment are omitted. In this embodiment, the length of the structural part of each lens is small, the width of the ring belt of the matching spacer element is small, and the wall thickness of the lens barrel is relatively uniform, which is conducive to controlling the miniaturization of the zoom lens compensation group.

[0126] Embodiment 7

[0127] like Figure 8 As shown, the zoom lens compensation group of the seventh embodiment of the present application is described. Figure 8 A schematic structural diagram of a zoom lens compensation group of Embodiment 7 is shown.

[0128] like Figure 8 As shown, the zoom lens compensation group includes, from the object side to the image side, a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a third lens E3, a third spacing element P3, a fourth lens E4, a fourth spacing element P4, and a fifth lens E5.

[0129] In this embodiment, there are two spacer elements between the first lens E1 and the second lens E2, which are supported on the image side of the first spacer element P1; there are two spacer elements between the third lens E3 and the fourth lens E4, which are supported on the image side of the third spacer element P3; there are two spacer elements between the fourth lens E4 and the fifth lens E5, which are supported on the image side of the fourth spacer element P4. While ensuring stable support, the spacing between adjacent lenses is controlled by using thicker spacer elements to meet imaging requirements, and the smaller inner diameter of thinner spacer elements is used to intercept stray light and improve edge imaging effects. In addition, the image side end of the lens barrel P0 has a support section extending toward the optical axis for the image side of the fifth lens E5 to support. That is to say, the zoom lens compensation group of this embodiment is assembled in order from the fifth lens E5 to the first lens E1.

[0130] In this embodiment, the first lens E1 has 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 convex. The second lens E2 has positive 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 negative focal power, the object side surface S5 of the third lens is concave, and the image side surface S6 of the third lens is concave. The fourth lens E4 has positive focal power, the object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is convex. The fifth lens E5 has negative focal power, the object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is concave.

[0131] Table 6 shows the basic structural parameters of the zoom lens compensation group of the seventh embodiment, wherein the units of the curvature radius, thickness / distance, effective radius and focal length are all millimeters (mm).

[0132] Face number Surface type Radius of curvature thickness Refractive Index Abbe number Cone coefficient S1 Aspheric 13.2990 2.6000 1.55 56.1 0.9232 S2 Aspheric -81.4913 2.6983 99.0000 S3 Aspheric 5.1082 1.5440 1.55 56.1 -0.5002 S4 Aspheric 46.7919 0.1022 99.0000 STO Spherical endless 0.0960 S5 Aspheric -71.6160 0.5660 1.68 19.2 -14.199 S6 Aspheric 5.2690 3.1574 0.1296 S7 Aspheric 14.3915 1.1979 1.68 19.2 0.8661 S8 Aspheric -15.5155 2.1215 7.9372 S9 Aspheric 20.5073 1.8420 1.62 25.9 51.7821 S10 Aspheric 5.9095 2.1141 0.3752

[0133] Table 6

[0134] Table 7 shows the high-order coefficients that can be used for each aspherical mirror surface in the embodiment, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the above embodiment 1. In this embodiment, the object side surface and the image side surface of the first lens to the fifth lens are all aspherical surfaces.

[0135] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -1.6331E-04 1.1714E-05 -7.7477E-07 1.0370E-07 -2.5410E-08 3.2319E-09 -2.2511E-10 8.2283E-12 -1.2527E-13 S2 -5.6518E-04 5.4097E-05 -5.1014E-07 -6.0182E-07 9.0457E-08 -7.3874E-09 3.6469E-10 -1.0205E-11 1.2135E-13 S3 -9.1291E-04 -1.1452E-04 1.0797E-04 -3.9255E-05 8.5227E-06 -1.1384E-06 9.0386E-08 -3.8736E-09 6.8282E-11 S4 -1.1141E-04 -1.0236E-03 8.1184E-04 -3.5562E-04 9.2245E-05 -1.4469E-05 1.3449E-06 -6.8094E-08 1.4459E-09 S5 3.3957E-06 -4.8769E-05 2.9278E-04 -1.9109E-04 5.9281E-05 -1.0326E-05 1.0317E-06 -5.5263E-08 1.2316E-09 S6 -1.4432E-03 9.0990E-04 -3.3819E-04 7.7099E-05 -9.5090E-06 3.1431E-07 6.3621E-08 -7.8853E-09 2.8096E-10 S7 -1.5859E-03 2.8688E-04 -5.7341E-05 9.6097E-06 -1.3931E-06 1.6025E-07 -1.2626E-08 5.7756E-10 -1.0541E-11 S8 -2.0361E-03 3.4964E-04 -6.5110E-05 9.9002E-06 -1.1843E-06 1.0440E-07 -5.8402E-09 1.5858E-10 -6.7264E-14 S9 -5.4843E-03 5.1536E-04 -2.8730E-04 1.6608E-04 -6.3487E-05 1.4970E-05 -2.1205E-06 1.6545E-07 -5.4974E-09 S10 -4.6571E-03 3.0930E-04 -9.7107E-06 -9.4206E-06 4.2110E-06 -9.3276E-07 1.1733E-07 -7.9391E-09 2.2430E-10

[0136] Table 7

[0137] Embodiment 8

[0138] like Fig. 9 As shown, the zoom lens compensation group of the eighth embodiment of the present application is described, which differs from the seventh embodiment in that the distances and thicknesses between the spacer elements, lenses, lens barrel P0, etc. are different.

[0139] Fig. 9 The structure diagram of the zoom lens compensation group of the eighth embodiment is shown. For the sake of brevity, some descriptions similar to those of the seventh embodiment are omitted. In this embodiment, the length of the structural part of each lens is small, the width of the ring belt of the matching spacer element is small, and the wall thickness of the lens barrel is relatively uniform, which is conducive to controlling the miniaturization of the zoom lens compensation group.

[0140] Embodiment 9

[0141] like Fig.10 As shown, the zoom lens compensation group of the ninth embodiment of the present application is described, which differs from the seventh embodiment in that the distances and thicknesses between the spacer elements, lenses, lens barrel P0, etc. are different.

[0142] Fig.10 The structure diagram of the zoom lens compensation group of the ninth embodiment is shown. For the sake of brevity, some descriptions similar to those of the seventh embodiment are omitted. The wall thickness of the lens barrel is relatively uniform, which is conducive to reducing the volume of the zoom lens compensation group.

[0143] Embodiment 10

[0144] like Fig.11 As shown, the zoom lens compensation group of the tenth embodiment of the present application is described. Fig.11 A schematic structural diagram of a zoom lens compensation group of the tenth embodiment is shown.

[0145] like Fig.11 As shown, the zoom lens compensation group includes, from the object side to the image side, a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a third lens E3, a third spacing element P3, a fourth lens E4, a fourth spacing element P4, and a fifth lens E5.

[0146] In this embodiment, there are two spacer elements between the first lens E1 and the second lens E2, which are supported on the image side of the first spacer element P1; there are two spacer elements between the third lens E3 and the fourth lens E4, which are supported on the image side of the third spacer element P3; there are two spacer elements between the fourth lens E4 and the fifth lens E5, which are supported on the image side of the fourth spacer element P4. While ensuring stable support, the spacing between adjacent lenses is controlled by using thicker spacer elements to meet imaging requirements, and the smaller inner diameter of thinner spacer elements is used to intercept stray light and improve edge imaging effects. In addition, the image side end of the lens barrel P0 has a support section extending toward the optical axis for the image side of the fifth lens E5 to support. That is to say, the zoom lens compensation group of this embodiment is assembled in order from the fifth lens E5 to the first lens E1.

[0147] In this embodiment, the first lens E1 has 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 convex. The second lens E2 has positive 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 negative focal power, the object side surface S5 of the third lens is concave, and the image side surface S6 of the third lens is concave. The fourth lens E4 has positive focal power, the object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is convex. The fifth lens E5 has negative focal power, the object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is concave.

[0148] Table 8 shows the basic structural parameters of the zoom lens compensation group of Example 10, wherein the units of the curvature radius, thickness / distance, effective radius and focal length are all millimeters (mm).

[0149]

[0150]

[0151] Table 8

[0152] Table 9 shows the high-order coefficients that can be used for each aspherical mirror surface in the embodiment, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the above embodiment 1. In this embodiment, the object side surface and the image side surface of the first lens to the fifth lens are all aspherical surfaces.

[0153] Face number A4 A6 A8 A1 A12 A14 A16 A18 A20 S1 -1.5888E-04 9.5367E-06 -1.0819E-06 1.9448E-07 -3.2011E-08 3.1765E-09 -1.8747E-10 6.0803E-12 -8.4354E-14 S2 -5.1686E-04 4.5096E-05 -1.7825E-06 -2.9952E-08 1.6971E-09 5.7006E-10 -6.4144E-11 2.7199E-12 -4.5583E-14 S3 -8.4613E-04 -1.2543E-04 1.1250E-04 -4.3041E-05 9.8274E-06 -1.3679E-06 1.1272E-07 -5.0204E-09 9.2527E-11 S4 -3.2468E-04 -7.4992E-04 6.6184E-04 -3.1160E-04 8.4924E-05 -1.3805E-05 1.3188E-06 -6.8287E-08 1.4780E-09 S5 -2.4965E-04 2.6916E-04 1.0865E-04 -1.2979E-04 4.6821E-05 -8.7711E-06 9.1666E-07 -5.0690E-08 1.1578E-09 S6 -1.4876E-03 1.0162E-03 -4.2079E-04 1.1384E-04 -1.9757E-05 2.1030E-06 -1.2541E-07 3.2003E-09 3.3620E-12 S7 -1.5053E-03 2.5869E-04 -5.1026E-05 8.8917E-06 -1.3950E-06 1.7310E-07 -1.4556E-08 7.1612E-10 -1.4859E-11 S8 -2.0047E-03 3.3141E-04 -5.9254E-05 8.9112E-06 -1.0873E-06 9.9586E-08 -5.8859E-09 1.8244E-10 -1.3305E-12 S9 -5.5013E-03 6.4346E-04 -4.4395E-04 2.6669E-04 -1.0092E-04 2.3322E-05 -3.2239E-06 2.4503E-07 -7.9117E-09 S10 -4.5973E-03 2.9638E-04 -4.2769E-06 -1.1781E-05 4.7880E-06 -1.0126E-06 1.2313E-07 -8.0954E-09 2.2284E-10

[0154] Table 9

[0155] Embodiment 11

[0156] like Fig.12 As shown, the zoom lens compensation group of the eleventh embodiment of the present application is described, which is different from the tenth embodiment in that the distances and thicknesses between the spacer elements, lenses, lens barrel P0, etc. are different.

[0157] Fig.12 The structure diagram of the zoom lens compensation group of the eleventh embodiment is shown. For the sake of brevity, some descriptions similar to those of the tenth embodiment are omitted. In this embodiment, the wall thickness of the lens barrel is relatively uniform, which is conducive to reducing the volume of the zoom lens compensation group. At the same time, the spacer element can have a larger annular width to improve the stability of the bearing.

[0158] Embodiment 12

[0159] like Fig.13 As shown, the zoom lens compensation group of the twelfth embodiment of the present application is described, which is different from the tenth embodiment in that the distances and thicknesses between the spacer elements, lenses, lens barrel P0, etc. are different.

[0160] Fig.13 The structure diagram of the zoom lens compensation group of the twelfth embodiment is shown. For the sake of brevity, some descriptions similar to those of the tenth embodiment are omitted. In this embodiment, the length of the structural part of each lens is small, the width of the ring belt of the matching spacer element is small, and the wall thickness of the lens barrel is relatively uniform, which is conducive to controlling the miniaturization of the zoom lens compensation group.

[0161] In summary, the first to twelfth embodiments of the zoom lens compensation group respectively satisfy the relationships shown in Table 10.

[0162]

[0163]

[0164] Table 10

[0165] Table 11 shows the effective focal lengths f1 to f5 of the lenses of the zoom lens compensation group of Embodiments 1 to 12, in mm.

[0166] Parameters / Examples 1 2 3 4 5 6 7 8 9 10 11 12 f1 21.25 21.25 21.25 21.44 21.44 21.44 21.15 21.15 21.15 21.11 21.11 21.11 f2 10.52 10.52 10.52 10.36 10.36 10.36 10.37 10.37 10.37 10.35 10.35 10.35 f3 -7.36 -7.36 -7.36 -7.26 -7.26 -7.26 -7.23 -7.23 -7.23 -7.23 -7.23 -7.23 f4 11.25 11.25 11.25 11.21 11.21 11.21 11.21 11.21 11.21 11.30 11.30 11.30 f5 -13.34 -13.34 -13.34 -13.86 -13.86 -13.86 -14.09 -14.09 -14.09 -14.15 -14.15 -14.15

[0167] Tables 11 and 12 give some structural parameters of the zoom lens compensation group of Embodiments 1 to 12, in units of mm.

[0168]

[0169]

[0170] Table 12

[0171] The present application also provides an imaging device, whose electronic photosensitive element can be a photosensitive 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 zoom lens compensation group described above.

[0172] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0173] 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 form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

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

[0175] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A zoom lens compensation group, characterized in that: The number of lenses with optical power in the zoom lens compensation group is five, and the zoom lens compensation group includes: A lens group, wherein the lens group includes first to fifth lenses arranged in sequence from the object side to the image side of the zoom lens compensation group; a spacer element group, wherein the spacer element group includes at least a first spacer element located between the first lens and the second lens and at least partially in contact with the image side surface of the first lens, a second spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens, a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens, and a fourth spacer element located between the fourth lens and the fifth lens and at least partially in contact with the image side surface of the fourth lens; a lens barrel, wherein the lens group and the spacer element group are accommodated in the lens barrel; Wherein, the air interval T12 between the first lens and the second lens on the optical axis of the zoom lens compensation group and the air interval T23 between the second lens and the third lens on the optical axis satisfy: 12.10≤T12 / T23≤14.81; The effective focal length f2 of the second lens, the interval EP12 between the first spacing element and the second spacing element along the optical axis, and the air interval T12 between the first lens and the second lens on the optical axis satisfy: 5.99≤f2 / (EP12-T12)≤6.

63.

2. The zoom lens compensation group according to claim 1, characterized in that: The outer diameter D0m of the image side end surface of the lens barrel, the inner diameter d0m of the image side end surface of the lens barrel, the outer diameter D0s of the object side end surface of the lens barrel, and the inner diameter d0s of the object side end surface of the lens barrel satisfy the following relationship: 3.63≤(D0m-d0m) / (D0s-d0s)≤5.

99.

3. The zoom lens compensation group according to claim 1, characterized in that: The effective focal length f1 of the first lens, the center thickness CT1 of the first lens, and the interval EP01 between the object-side end surface of the lens barrel and the first spacing element along the optical axis direction satisfy: 14.22≤f1 / CT1+f1 / EP01≤22.

55.

4. The zoom lens compensation group according to claim 1, characterized in that: The air interval T23 between the second lens and the third lens on the optical axis and the maximum thickness CP2 of the second spacing element satisfy: 8.99≤T23 / CP2≤12.

11.

5. The zoom lens compensation group according to claim 1, characterized in that: The effective focal length f3 of the third lens, the center thickness CT3 of the third lens, the refractive index N3 of the third lens, and the interval EP23 between the second spacer element and the third spacer element along the optical axis satisfy: -4.94≤(f3*CT3*N3) / EP23≤-4.

21.

6. The zoom lens compensation group according to claim 1, characterized in that: The effective focal length f4 of the fourth lens and the interval EP34 between the third spacing element and the fourth spacing element along the optical axis direction satisfy: 3.11≤f4 / EP34≤3.

52.

7. The zoom lens compensation group according to claim 1, characterized in that: The interval EP34 between the third spacing element and the fourth spacing element along the optical axis direction, the maximum thickness CP4 of the fourth spacing element, and the center thickness CT4 of the fourth lens satisfy the following: 2.36≤EP34 / (CT4+CP4)≤2.

71.

8. The zoom lens compensation group according to claim 1, characterized in that: The curvature radius R2 of the image side surface of the first lens, the outer diameter D1s of the object side surface of the first spacer element, and the inner diameter d1s of the object side surface of the first spacer element satisfy the following: -47.70≤R2 / (D1s-d1s)≤-25.

60.

9. The zoom lens compensation group according to claim 1, characterized in that: The curvature radius R4 of the image side surface of the second lens, the outer diameter D2s of the object side surface of the second spacer element, and the inner diameter d2s of the object side surface of the second spacer element satisfy the following: 12.52≤R4 / (D2s-d2s)≤17.

05.

10. The zoom lens compensation group according to any one of claims 1 to 9, characterized in that: The outer diameter D2m of the image side surface of the second spacer element, the outer diameter D3s of the object side surface of the third spacer element, and the curvature radius R5 of the object side surface of the third lens satisfy: -3.84≤R5 / (D2m+D3s)≤-2.

39.

11. The zoom lens compensation group according to any one of claims 1 to 9, characterized in that: The curvature radius R6 of the image side surface of the third lens, the refractive index N3 of the third lens, the outer diameter D3m of the image side surface of the third spacing element, and the inner diameter d3m of the image side surface of the third spacing element satisfy the following: 2.10≤R6*N3 / (D3m-d3m)≤3.

06.

12. The zoom lens compensation group according to any one of claims 1 to 9, characterized in that: The effective focal length f5 of the fifth lens, the center thickness CT5 of the fifth lens, the outer diameter D0m of the image side end surface of the lens barrel, and the inner diameter d0m of the image side end surface of the lens barrel satisfy: -13.97≤(f5 / CT5)*(D0m / d0m)≤-12.

66.

13. The zoom lens compensation group according to any one of claims 1 to 9, characterized in that: The curvature radius R8 of the image side surface of the fourth lens, the outer diameter D4s of the object side surface of the fourth spacing element, and the inner diameter d4s of the object side surface of the fourth spacing element satisfy the following: -5.79≤R8 / (D4s-d4s)≤-3.

94.

14. The zoom lens compensation group according to any one of claims 1 to 9, characterized in that: The first lens has positive optical power, the second lens has positive optical power, the third lens has negative optical power, the fourth lens has positive optical power, and the fifth lens has negative optical power.

15. The zoom lens compensation group according to any one of claims 1 to 9, characterized in that: The object side surface of the first lens is convex, the image side surface of the first lens is convex, the object side surface of the second lens is convex, the image side surface of the second lens is concave, the object side surface of the third lens is concave, the image side surface of the third lens is concave, the object side surface of the fourth lens is convex, and the image side surface of the fourth lens is convex; the object side surface of the fifth lens is convex, and the image side surface of the fifth lens is concave.

Images