Imaging system

Abstract

The utility model discloses an imaging system, and the system comprises a lens group. The zoom lens sequentially comprises a first lens with positive focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with positive focal power, a fifth lens with negative focal power, a sixth lens with positive focal power and a seventh lens with negative focal power from an object side to an image side along an optical axis, the spacing element group comprises a second spacing element and a third spacing element; the central thickness CT4 of the fourth lens on the optical axis and the air interval T45 of the fourth lens and the fifth lens on the optical axis meet the following conditions: 1lt; cT4 / T45lt; 2; the center thickness CT2 of the second lens on the optical axis, the center thickness CT3 of the third lens on the optical axis and the thickness CP2 of the second spacing element in the optical axis direction meet the following conditions: 0.5 lt; (CT2-CT3) / CP2lt, (CT2-CT3) / 14; the center thickness CT4 of the fourth lens on the optical axis and the thickness CP3 of the third spacing element in the optical axis direction satisfy: 50lt; cT4 / CP3lt; 54).

Description

Technical Field

[0001] This application relates to the field of optical elements, and specifically, to an imaging system. Background Art

[0002] With the progress of technology and the improvement of living standards, portable intelligent devices have developed vigorously, and consumers have higher requirements for the camera function of smartphones. In daily shooting, a large aperture is often used because it can obtain a picture with a good background blur effect. In particular, a large aperture lens can increase the light input, making the picture brighter and clearer, especially in low-light environments. However, large aperture lenses also face some problems. For example, the larger the light throughput, the more prone to stray light interference, and a large amount of unwanted stray light is easily generated in the non-effective diameter part of the lens, which will seriously affect the imaging quality of the lens. Therefore, reasonably setting the spatial arrangement and related parameters of the lens and the spacer element, optimizing the stray light on the premise of meeting mechanical alignment, and at the same time improving the processability of the lens to ensure that the lens has good reliability is of great significance for improving the performance of large aperture lenses. Summary of the Utility Model

[0003] The first aspect of this application provides such an imaging system, which includes: a lens group and a spacer element group. Among them, the lens group includes, in order from the object side to the image side along the optical axis: a first lens with a positive optical power, a second lens with a negative optical power, a third lens with a negative optical power, a fourth lens with a positive optical power, a fifth lens with a negative optical power, a sixth lens with a positive optical power, and a seventh lens with a negative optical power. The spacer element group includes: a second spacer element and a third spacer element. Among them, the second spacer element is placed on the image side of the second lens and at least partially contacts the image side surface of the second lens, and the third spacer element is placed on the image side of the third lens and at least partially contacts the image side surface of the third lens. The central thickness CT4 of the fourth lens on the optical axis and the air gap T_{45} between the fourth lens and the fifth lens on the optical axis satisfy: 1 < CT4 / T_{45} < 2; the central thickness CT2 of the second lens on the optical axis, the central thickness CT3 of the third lens on the optical axis, and the thickness CP2 of the second spacer element along the optical axis direction satisfy: 0.5 < (CT2 - CT3) / CP2 < 14; the central thickness CT4 of the fourth lens on the optical axis and the thickness CP3 of the third spacer element along the optical axis direction satisfy: 50 < CT4 / CP3 < 54.

[0004] In one embodiment, the spacer element group further includes: a fourth spacer element, a fifth spacer element, and a sixth spacer element. The fourth spacer element is disposed on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens. The fifth spacer element is disposed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens. The sixth spacer element is disposed on the image side of the sixth lens and at least partially contacts the image side surface of the sixth lens. The air gap T45 between the fourth lens and the fifth lens on the optical axis, the central thickness CT4 of the fourth lens on the optical axis, and the central thickness CT5 of the fifth lens on the optical axis satisfy: 2 < T45 / (CT4 - CT5) < 3. The axial distance EP45 from the image side surface of the fourth spacer element to the object side surface of the fifth spacer element, the axial distance EP56 from the image side surface of the fifth spacer element to the object side surface of the sixth spacer element, and the thickness CP5 of the fifth spacer element along the optical axis direction satisfy: 0.8 < EP56 / (EP45 - CP5) < 4.

[0005] In one embodiment, the spacer element group further includes: a sixth spacer element disposed on the image side of the sixth lens and at least partially contacting the image side surface of the sixth lens. The central thickness CT6 of the sixth lens on the optical axis, the central thickness CT7 of the seventh lens on the optical axis, and the thickness CP6 of the sixth spacer element along the optical axis direction satisfy: 2.5 < (CT6 + CT7) / CP6 < 4.5.

[0006] In one embodiment, the spacer element group further includes: a fifth spacer element and a sixth spacer element. The fifth spacer element is disposed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens. The sixth spacer element is disposed on the image side of the sixth lens and at least partially contacts the image side surface of the sixth lens. The inner diameter d5s of the object side surface of the fifth spacer element, the inner diameter d6s of the object side surface of the sixth spacer element, and the central thickness CT6 of the sixth lens on the optical axis satisfy: 3 < (d6s - d5s) / CT6 < 4.5.

[0007] In one embodiment, the spacer element group further includes: a fourth spacer element and a fifth spacer element. The fourth spacer element is disposed on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens. The fifth spacer element is disposed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens. The axial distance EP45 from the image side surface of the fourth spacer element to the object side surface of the fifth spacer element and the central thickness CT5 of the fifth lens on the optical axis satisfy: 0.8 < EP45 / CT5 < 1.8. [[ID=,10]]

[0008] In one embodiment, the imaging system satisfies: 1 < f1 / R1 < 3 and -18 < f2 / D2s < -8, where f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, R1 is the curvature radius of the object side surface of the first lens, and D2s is the outer diameter of the object side surface of the second spacer element.

[0009] In one embodiment, the imaging system satisfies: 3 < CT2 / (T12 + CP2) < 6, where CT2 is the central thickness of the second lens on the optical axis, T12 is the air gap between the first lens and the second lens on the optical axis, and CP2 is the thickness of the second spacer element along the optical axis direction.

[0010] In one embodiment, the spacer element group further includes: a fourth spacer element disposed on the image side of the fourth lens and at least partially contacting the image side surface of the fourth lens; the imaging system satisfies: 3 < f4 / (D4s - d3m) < 7, where f4 is the effective focal length of the fourth lens, D4s is the outer diameter of the object side surface of the fourth spacer element, and d3m is the inner diameter of the image side surface of the third spacer element.

[0011] In one embodiment, the imaging system satisfies: 3 < R5 / R4 < 4 and -22 < f3 / (T23 + EP23) < -18, where R4 is the radius of curvature of the image side surface of the second lens, R5 is the radius of curvature of the object side surface of the third lens, f3 is the effective focal length of the third lens, T23 is the air gap between the second lens and the third lens on the optical axis, and EP23 is the axial distance from the image side surface of the second spacer element to the object side surface of the third spacer element.

[0012] In one embodiment, the spacer element group further includes: a fifth spacer element disposed on the image side of the fifth lens and at least partially contacting the image side surface of the fifth lens; the imaging system satisfies: 0.9 < (CT5 + CP5) / T45 < 2.5, where CT5 is the central thickness of the fifth lens on the optical axis, CP5 is the thickness of the fifth spacer element along the optical axis direction, and T45 is the air gap between the fourth lens and the fifth lens on the optical axis.

[0013] In one embodiment, the spacer element group further includes: a fifth spacer element and a sixth spacer element, where the fifth spacer element is disposed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens, and the sixth spacer element is disposed on the image side of the sixth lens and at least partially contacts the image side surface of the sixth lens; the imaging system satisfies: 1.5 < f56 / (d^6m - d^5m) < 5.5, where f56 is the combined focal length of the fifth lens and the sixth lens, d^5m is the inner diameter of the image side surface of the fifth spacer element, and d^6m is the inner diameter of the image side surface of the sixth spacer element.

[0014] In one embodiment, the spacer element group further includes: a sixth spacer element disposed on the image side of the sixth lens and at least partially contacting the image side surface of the sixth lens; the imaging system satisfies: 4 < R13 / R14 < 6 and 1 < CT7 / CP6 < 2, where R13 is the radius of curvature of the object side surface of the seventh lens, R14 is the radius of curvature of the image side surface of the seventh lens, CT7 is the central thickness of the seventh lens on the optical axis, and CP6 is the thickness of the sixth spacer element along the optical axis direction.

[0015] In one embodiment, the spacer element group further includes: a sixth spacer element and a seventh spacer element, where the sixth spacer element is disposed on the image side of the sixth lens and at least partially contacts the image side surface of the sixth lens, and the seventh spacer element is disposed on the image side of the seventh lens and at least partially contacts the image side surface of the seventh lens; the imaging system satisfies: 0.8 < EP67 / CT7 < 1.8, where EP67 is the on-axis distance from the image side surface of the sixth spacer element to the object side surface of the seventh spacer element, and CT7 is the central thickness of the seventh lens on the optical axis.

[0016] In one embodiment, the spacer element group further includes: a seventh spacer element disposed on the image side of the seventh lens and at least partially contacting the image side surface of the seventh lens; the imaging system satisfies: -7.5 < f7 / (D7m - d7s) < -5, where f7 is the effective focal length of the seventh lens, D7m is the outer diameter of the image side surface of the seventh spacer element, and d7s is the inner diameter of the object side surface of the seventh spacer element.

[0017] In one embodiment, the spacer element group further includes: a sixth spacer element and a sixth auxiliary spacer element, where the sixth spacer element is disposed on the image side of the sixth lens and at least partially contacts the image side surface of the sixth lens, and the sixth auxiliary spacer element is disposed on the image side of the sixth spacer element and at least partially contacts the image side surface of the sixth spacer element; the imaging system satisfies: 1 < (D6bs - d6bm) / T67 <​​​​​​

[0020] In one embodiment, the spacer element group further includes: a fifth spacer element and a fifth auxiliary spacer element, wherein the fifth spacer element is disposed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens, and the fifth auxiliary spacer element is disposed on the image side of the fifth spacer element and at least partially contacts the image side surface of the fifth spacer element; the imaging system satisfies: 0.8 < (d5m - d5bs) / T56 < 5, where d5m is the inner diameter of the image side surface of the fifth spacer element, d5bs is the inner diameter of the object side surface of the fifth auxiliary spacer element, and T56 is the air gap between the fifth lens and the sixth lens on the optical axis.

[0021] In a second aspect of the present application, there is provided such an imaging system, which includes: a lens group and a spacer element group. The lens group may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The first lens may have a positive optical power, the second lens may have a negative optical power, the third lens may have a negative optical power, the fourth lens may have a positive optical power, the fifth lens may have a negative optical power, the sixth lens may have a positive optical power, and the seventh lens may have a negative optical power. The spacer element group may include a second spacer element and a third spacer element. The second spacer element is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens. The third spacer element is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens. The imaging system may satisfy: 3 < R5 / R4 < 4 and -22 < f3 / (T23 + EP23) < -18, where R4 is the radius of curvature of the image side surface of the second lens, R5 is the radius of curvature of the object side surface of the third lens, f3 is the effective focal length of the third lens, T23 is the air gap between the second lens and the third lens on the optical axis, and EP23 is the axial distance from the image side surface of the second spacer element to the object side surface of the third spacer element. Satisfying 3 < R5 / R4 < 4 and -22 < f3 / (T23 + EP23) < -18 limits the radii of curvature of the adjacent surfaces of the second lens and the third lens, and on the premise of ensuring the effective focal length of the third lens, restricts the air gap between the second lens and the third lens and the edge thickness of the third lens, ensuring the molding processability of the lens.

[0022] The present application provides a seven-piece imaging system. Due to the large aperture, a large amount of light enters the lens. The refractive power of the third lens and the refractive power of the fourth lens have opposite positive and negative attributes. The light undergoes large-angle refraction and reflection at the edges of these two lenses, resulting in a large amount of stray light. To solve the problem of reflected stray light at the non-effective diameter parts of the third lens and the fourth lens, it is necessary to reasonably design the arrangement of the refractive powers of each lens so that the positive and negative attributes of the refractive powers of any two adjacent lenses from the third lens to the seventh lens are opposite to correct the aberration of the imaging system. At the same time, the imaging system also satisfies 1 < CT4 / T45 < 2, 0.5 < (CT2 - CT3) / CP2 < 14, and 50 < CT4 / CP3 < 54. By restricting the central thicknesses of the second lens, the third lens and the fourth lens, the air gap between the fourth lens and the fifth lens, and the thicknesses of the second spacer element and the third spacer element, the thicknesses of the relevant lenses and the overall lens can be reduced. The second spacer element and the third spacer element can block the adverse stray light caused by the non-effective diameter parts of the lenses, ensuring that the imaging is not interfered by stray light. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Other features, objects, and advantages of the present application will become more apparent by reading the detailed description of the non-limiting embodiments made with reference to the following drawings: <000​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​

[0032] Figures 5A to 5C The axial chromatic aberration curve, astigmatism curve, and distortion curve of the imaging systems according to Embodiment 4, Embodiment 5, and Embodiment 6 of the present application are respectively shown;

[0033] Figure 6A 1 shows a schematic structural diagram of an imaging system according to Example 7 of the present application;

[0034] Figure 6B 1 shows a schematic structural diagram of an imaging system according to Example 8 of the present application;

[0035] Figure 6C shows a schematic structural diagram of an imaging system according to embodiment 9 of the present application; and

[0036] 7A to 7C The axial chromatic aberration curve, astigmatism curve, and distortion curve of the imaging systems according to Embodiment 7, Embodiment 8, and Embodiment 9 of the present application are respectively shown;

[0037] Figure 8 shows a stray light spot diagram on the imaging surface of an imaging system according to the present application when CT4 / T45=0.01 and CT4 / CP3=0.5;

[0038] Figure 9 shows a stray light spot diagram on the imaging surface of an imaging system according to the present application when CT4 / T45=1.455 and CT4 / CP3=51.8;

[0039] Figure 10 shows a stray light spot diagram on the imaging surface of an imaging system according to the present application when CT4 / T45=1.59 and CT4 / CP3=53.4;

[0040] Figure 11 shows a stray light spot diagram on the imaging surface of an imaging system according to the present application when CT4 / T45=15 and CT4 / CP3=80;

[0041] Figure 12 Schematic diagram showing the inner diameter slope and inner diameter surface of the spacer element. DETAILED DESCRIPTION

[0042] For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely descriptions of exemplary embodiments of the present application and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0043] It should be noted that in this specification, the terms "first," "second," "third," etc., are used solely to distinguish one feature from another and do not limit the features. Thus, the first lens discussed below could also be referred to as the second lens or the third lens without departing from the teachings of this application.

[0044] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0045] In this article, the paraxial region refers to the area near the optical axis. If a lens surface is convex and the location of the convex surface is undefined, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the location of the concave surface is undefined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0046] It should also be understood that the terms "comprises," "including," "having," "includes," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application." And, the term "exemplary" is intended to refer to an example or illustration.

[0047] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art to which this application belongs. It should also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and will not be interpreted in an idealized or overly formal sense unless expressly defined as such herein.

[0048] It should be noted that, in the absence of any conflict, the embodiments and features of the embodiments in this application can be combined with each other. The following embodiments only express several implementation methods of the present application, and their descriptions are relatively specific and detailed, but they should not be understood as limiting the scope of the patent of this application. It should be pointed out that for those skilled in the art, several variations and improvements can be made without departing from the concept of the present application, and these all fall within the scope of protection of this application. For example, the lens groups, lens barrels, and spacer elements in the various embodiments of the present application can be combined arbitrarily, and are not limited to the lens group in one embodiment being combined only with the lens barrel, spacer element, etc. of that embodiment.

[0049] The present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0050] An imaging system according to an exemplary embodiment of the present application includes a lens assembly and a spacer assembly. The lens assembly may include seven lenses having optical power, namely a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. These seven lenses are arranged in sequence along the optical axis from the object side to the image side. Any two adjacent lenses among the first to seventh lenses may be spaced apart by a distance.

[0051] In an exemplary embodiment, the first lens may have positive optical power, the second lens may have negative optical power, the third lens may have negative optical power, the fourth lens may have positive optical power, the fifth lens may have negative optical power, the sixth lens may have positive optical power, and the seventh lens may have negative optical power.

[0052] In an exemplary embodiment, the spacer element group of the imaging system may include at least one of a first spacer element, a second spacer element, a third spacer element, a fourth spacer element, a fifth spacer element, a sixth spacer element, and a seventh spacer element. The first spacer element is positioned on the image side of the first lens and is in at least partial contact with the image side surface of the first lens. The second spacer element is positioned on the image side of the second lens and is in at least partial contact with the image side surface of the second lens. The third spacer element is positioned on the image side of the third lens and is in at least partial contact with the image side surface of the third lens. The fourth spacer element is positioned on the image side of the fourth lens and is in at least partial contact with the image side surface of the fourth lens. The fifth spacer element is positioned on the image side of the fifth lens and is in at least partial contact with the image side surface of the fifth lens. The sixth spacer element is positioned on the image side of the sixth lens and is in at least partial contact with the image side surface of the sixth lens. The seventh spacer element is positioned on the image side of the seventh lens and is in at least partial contact with the image side surface of the seventh lens.

[0053] It should be understood that this application does not specifically limit the number of spacer elements; any number of spacer elements may be included between any two lenses, and the entire imaging system may also include any number of spacer elements. Spacer elements help the imaging system intercept excess refractive and reflective light paths, reducing stray light and ghosting. Spacer elements also help provide additional support between the lenses and the lens barrel, helping to alleviate issues such as poor assembly stability and low performance yield caused by large step differences between lenses.

[0054] In an exemplary embodiment, the spacer element group may include: a fifth spacer element and a fifth auxiliary spacer element, wherein the fifth spacer element is placed on the image side of the fifth lens and is in at least partial contact with the image side surface of the fifth lens, and the fifth auxiliary spacer element is placed on the image side of the fifth spacer element and is in at least partial contact with the image side surface of the fifth spacer element.

[0055] In an exemplary embodiment, the spacer element group may include: the spacer element group also includes: a sixth spacer element and a sixth auxiliary spacer element, wherein the sixth spacer element is placed on the image side of the sixth lens and is in at least partial contact with the image side surface of the sixth lens, and the sixth auxiliary spacer element is placed on the image side of the sixth spacer element and is in at least partial contact with the image side surface of the sixth spacer element.

[0056] The imaging system according to an exemplary embodiment of the present application further includes a lens barrel, which can be used to accommodate the lens and the spacer element. Exemplarily, the lens barrel can be integral or split. The split lens barrel can, for example, include a first lens barrel and a second lens barrel, the second lens barrel being disposed on the image side of the first lens barrel and connected to the first lens barrel.

[0057] Figure 1 A schematic diagram of the structure of an imaging system according to Example 1 of the present application and a schematic diagram of some parameters are shown. Figure 2A FIG1 shows a schematic structural diagram of an imaging system according to Example 1 of the present application. For the sake of clarity, Figure 1 Only some of the reference numerals of the parameters are shown in the figure. For the reference numerals of the lens barrel, lens and spacer elements, please refer to Figure 2A .like Figure 1 and Figure 2A As shown, an imaging system of the present application may include a lens barrel, a lens group, and a spacer group. The lens barrel includes a first lens barrel P01 and a second lens barrel P02. The lens group includes, from the object side to the image side along the optical axis, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. The spacer group includes a second spacer P2, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a fifth auxiliary spacer P5b, a sixth spacer P6, a sixth auxiliary spacer P6b, and a seventh spacer P7.

[0058] like Figure 1 As shown, CP2 is the thickness of the second spacer element along the optical axis direction, CP3 is the thickness of the third spacer element along the optical axis direction, CP5 is the thickness of the fifth spacer element along the optical axis direction, CP6 is the thickness of the sixth spacer element along the optical axis direction, EP23 is the on-axis distance from the image side surface of the second spacer element to the object side surface of the third spacer element, EP45 is the on-axis distance from the image side surface of the fourth spacer element to the object side surface of the fifth spacer element, EP56 is the on-axis distance from the image side surface of the fifth spacer element to the object side surface of the sixth spacer element, EP67 is the on-axis distance from the image side surface of the sixth spacer element to the object side surface of the seventh spacer element, D2s is the outer diameter of the object side surface of the second spacer element, d5s is the inner diameter of the object side surface of the fifth spacer element, d5bs is the inner diameter of the object side surface of the fifth auxiliary spacer element, D4s is the outer diameter of the object side surface of the fourth spacer element, d6s is the inner diameter of the object side surface of the sixth spacer element, d7s is the inner diameter of the object side surface of the seventh spacer element, D6bs is the outer diameter of the object side surface of the sixth auxiliary spacer element, d3m is the inner diameter of the image side surface of the third spacer element, d5m is the inner diameter of the image side surface of the fifth spacer element, d6bm is the inner diameter of the image side surface of the sixth auxiliary spacer element, d6m is the inner diameter of the image side surface of the sixth spacer element, and D7m is the outer diameter of the image side surface of the seventh spacer element.

[0059] As Figure 1 shown, d0s is the inner diameter of the object side end face of the lens barrel. More specifically, the lens barrel includes a first lens barrel P01 and a second lens barrel P02, d0s is the inner diameter of the object side end face of the first lens barrel, d0m is the inner diameter of the image side end face of the first lens barrel, and d0bs is the inner diameter of the object side end face of the second lens barrel.

[0060] Those skilled in the art should understand that some parameters of the lenses that are often used in the art (such as the central thickness CT2 of the second lens on the optical axis) are not shown in Figure 1 the Figure 1 figure, and only some parameters of the lens barrel and spacer elements of an imaging system according to the present application are示例性 shown for better understanding of the present invention.

[0061] In an exemplary embodiment, the imaging system according to the present application can satisfy: 1 < CT4 / T45 < 2, where CT4 is the central thickness of the fourth lens on the optical axis, and T45 is the air gap between the fourth lens and the fifth lens on the optical axis.

[0062] In an exemplary embodiment, the imaging system according to the present application can satisfy: 0.5 < (CT2 - CT3) / CP2 < 14, where CT2 is the central thickness of the second lens on the optical axis, CT3 is the central thickness of the third lens on the optical axis, and CP2 is the thickness of the second spacer element along the optical axis direction.

[0063] In an exemplary embodiment, the imaging system according to the present application may satisfy: 50 < CT4 / CP3 < 54, where CT4 is the central thickness of the fourth lens on the optical axis, and CP3 is the thickness of the third spacer element along the optical axis direction.

[0064] The imaging system according to an exemplary embodiment of the present application may include a lens group and a spacer element group. The lens group may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The first lens may have a positive optical power, the second lens may have a negative optical power, the third lens may have a negative optical power, the fourth lens may have a positive optical power, the fifth lens may have a negative optical power, the sixth lens may have a positive optical power, and the seventh lens may have a negative optical power. The spacer element group may include a second spacer element and a third spacer element. The second spacer element is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens. The third spacer element is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens. The imaging system may satisfy: 1 < CT4 / T45 < 2, 0.5 < (CT2 - CT3) / CP2 < 14, and 50 < CT4 / CP3 < 54, where CT4 is the central thickness of the fourth lens on the optical axis, T45 is the air gap between the fourth lens and the fifth lens on the optical axis, CT2 is the central thickness of the second lens on the optical axis, CT3 is the central thickness of the third lens on the optical axis, CP2 is the thickness of the second spacer element along the optical axis direction, CT4 is the central thickness of the fourth lens on the optical axis, and CP3 is the thickness of the third spacer element along the optical axis direction. In the seven-piece imaging system provided by the present application, due to the large aperture, a large amount of light enters the lens. The signs of the optical powers of the third lens and the fourth lens are opposite. The light rays are refracted and reflected at large angles at the edges of these two lenses, resulting in a large amount of stray light. To solve the reflected stray light at the non-effective diameter parts of the third lens and the fourth lens, it is necessary to reasonably design the arrangement of the optical powers of each lens so that the signs of the optical powers of any two adjacent lenses from the third lens to the seventh lens are opposite to correct the aberration of the imaging system. At the same time, the imaging system also satisfies 1 < CT4 / T45 < 2, 0.5 < (CT2 - CT3) / CP2 < 14, and 50 < CT4 / CP3 < 54. By restricting the central thicknesses of the second lens, the third lens, and the fourth lens, the air gap between the fourth lens and the fifth lens, and the thicknesses of the second spacer element and the third spacer element, the thicknesses of the relevant lenses and the overall lens can be reduced. The second spacer element and the third spacer element can block the adverse stray light caused by the non-effective diameter parts of the lenses and ensure that the imaging is not interfered by stray light. In addition, by restricting the central thicknesses of the second lens, the third lens, and the fourth lens, the air gap between the fourth lens and the fifth lens, and the thicknesses of the second spacer element and the third spacer element, it is beneficial to the processing and shaping of the lenses and also beneficial to the miniaturization of the module.

[0065] The imaging system provided by this application satisfies 1 < CT4 / T45 < 2, 0.5 < (CT2 - CT3) / CP2 < 14, and 50 < CT4 / CP3 < 54. The second spacer element and the third spacer element can block the unwanted stray light caused by the non-effective diameter part of the lens, ensuring that the imaging is not interfered by stray light. The following will further illustrate the role of the technical solution of this application in reducing the risk of stray light and improving the imaging quality in combination with Figures 8 to 11 The role of the technical solution of this application in reducing the risk of stray light and improving the imaging quality will be further described.

[0066] Figure 8 Fig. shows the stray light spot pattern on the imaging surface of an imaging system according to this application when CT4 / T45 = 0.01 and CT4 / CP3 = 0.5. Figure 9 Fig. shows the stray light spot pattern on the imaging surface of an imaging system according to this application when CT4 / T45 = 1.455 and CT4 / CP3 = 51.8. Figure 10 Fig. shows the stray light spot pattern on the imaging surface of an imaging system according to this application when CT4 / T45 = 1.59 and CT4 / CP3 = 53.4. Figure 11 Fig. shows the stray light spot pattern on the imaging surface of an imaging system according to this application when CT4 / T45 = 15 and CT4 / CP3 = 80. In addition, Figures 8 to 11 The shown imaging systems all satisfy 0.5 < (CT2 - CT3) / CP2 < 14. <00^00183>By comparison Figures 8 to 11 It can be seen that Figure 8 and Figure 11 For the shown imaging systems, neither CT4 / T45 nor CT4 / CP3 satisfies the ranges of 1 < CT4 / T45 < 2 and 50 < CT4 / CP3 < 54 of this application. Figure 8 and Figure 11 In, the distribution range of the stray light spots on the imaging surface is wide and the energy is strong. While Figure 9 ​​​​​​​​​In an exemplary embodiment, the imaging system according to the present application may satisfy: 2 < T45 / (CT4 - CT5) < 3 and 0.8 < EP56 / (EP45 - CP5) < 4, where T45 is the air gap between the fourth lens and the fifth lens on the optical axis, CT4 is the central thickness of the fourth lens on the optical axis, CT5 is the central thickness of the fifth lens on the optical axis, EP45 is the on-axis distance from the image side of the fourth spacer element to the object side of the fifth spacer element, EP56 is the on-axis distance from the image side of the fifth spacer element to the object side of the sixth spacer element, and CP5 is the thickness of the fifth spacer element along the optical axis direction. Constraining EP45 and EP56 is beneficial to constraining the edge thicknesses of the fifth lens and the sixth lens. At the same time, by combining the constraints on the central thicknesses of the fourth lens and the fifth lens and the air gap between the fourth lens and the fifth lens, the surface type trends of the fourth lens and the fifth lens can be ensured to be consistent, the optical powers of the fourth lens and the fifth lens can be controlled, the path of the light beam in the imaging system can be restricted, and the resolution of the lens can be improved. In addition, it is also beneficial to constrain the thickness uniformity of the fifth lens and the sixth lens and increase the manufacturability of lens molding.

[0069] In an exemplary embodiment, the imaging system according to the present application may satisfy: 2.5 < (CT6 + CT7) / CP6 < 4.5, where CT6 is the central thickness of the sixth lens on the optical axis, CT7 is the central thickness of the seventh lens on the optical axis, and CP6 is the thickness of the sixth spacer element along the optical axis direction. By restricting the ratio of the sum of the central thicknesses of the sixth lens and the seventh lens to the thickness of the sixth spacer element, the size of the gap between the edges of the sixth lens and the seventh lens is constrained, avoiding the problem that the thickness of the sixth spacer element becomes too large due to an excessive gap between the edges of the lens, which may cause primary reflection stray light on the inner diameter inclined surface of the sixth spacer element.

[0070] In the present application, the inner diameter inclined surface and the inner diameter surface of the spacer element are different concepts. The inner diameter surface of the spacer element refers to the inner wall surface of the spacer element parallel to the optical axis direction, and the inner diameter inclined surface of the spacer element refers to the inner wall surface of the spacer element that has a certain angle with the optical axis direction. Exemplarily, as Figure 12 shown, n1 is the inner diameter inclined surface of the fifth spacer element P5, and n2 is the inner diameter surface of the fifth auxiliary spacer element P5b.

[0071] In an exemplary embodiment, the imaging system according to the present application may satisfy: 3 < (d6s - d5s) / CT6 < 4.5, where d5s is the inner diameter of the object side of the fifth spacer element, d6s is the inner diameter of the object side of the sixth spacer element, and CT6 is the central thickness of the sixth lens on the optical axis. Satisfying 3 < (d6s - d5s) / CT6 < 4.5, by restricting the ratio of the difference in the inner diameters of the object sides of the fifth and sixth spacer elements to the central thickness of the sixth lens, the step difference between the fifth and sixth spacer elements is constrained, avoiding performance degradation problems caused by excessive step difference and resulting in unstable assembly.

[0072] In an exemplary embodiment, the imaging system according to the present application may satisfy: 0.8 < EP45 / CT5 < 1.8, where EP45 is the on-axis distance from the image side of the fourth spacer element to the object side of the fifth spacer element, and CT5 is the central thickness of the fifth lens on the optical axis. Satisfying 0.8 < EP45 / CT5 < 1.8, by restricting the ratio of the on-axis distance between the fourth and fifth spacer elements to the central thickness of the fifth lens, the ratio of the edge thickness to the central thickness of the fifth lens is constrained, ensuring the thickness uniformity of the fifth lens, improving the lens forming processability, and preventing the risk of welding marks and welding mark stray light caused by uneven lens thickness.

[0073] In an exemplary embodiment, the imaging system according to the present application may satisfy: 1 < f1 / R1 < 3 and -18 < f2 / D2s < -8, where f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, R1 is the radius of curvature of the object side of the first lens, and D2s is the outer diameter of the object side of the second spacer element. More specifically, the imaging system may further satisfy: 2.5 < f1 / R1 < 3 and -18 < f2 / D2s < -8.Satisfying 1 < f1 / R1 < 3 and -18 < f2 / D2s < -8, on the premise of ensuring the effective focal lengths of the first and second lenses, the radius of curvature of the first lens and the outer diameter of the object side of the second spacer element are constrained, ensuring the forming processability of the lens and spacer element, and at the same time preventing poor coating caused by excessive lens bending.

[0074] In an exemplary embodiment, the imaging system according to the present application may satisfy: 3 < CT2 / (T12 + CP2) < 6, where CT2 is the central thickness of the second lens on the optical axis, T12 is the air gap between the first lens and the second lens on the optical axis, and CP2 is the thickness of the second spacer element along the optical axis direction. Satisfying 3 < CT2 / (T12 + CP2) < 6 restricts the distance between the first lens and the second lens and the thickness of the second spacer element, avoiding performance sensitivity caused by the air gap between the first lens and the second lens, and large assembly deviation caused by too large designed gap, resulting in large performance variation; at the same time, preventing the problem of primary reflection stray light caused by the inner diameter surface of the spacer element due to too large thickness of the spacer element.

[0075] In an exemplary embodiment, the imaging system according to the present application may satisfy: 3 < f4 / (D4s - d3m) < 7, where f4 is the effective focal length of the fourth lens, D4s is the outer diameter of the object side of the fourth spacer element, and d3m is the inner diameter of the image side of the third spacer element. Satisfying 3 < f4 / (D4s - d3m) < 7 restricts the edge trend of the effective diameter of the fourth lens and the inner and outer diameter gradients of the third and fourth spacer elements, controls the light fall, intercepts the excess light in the outer field of view, improves the imaging quality, and at the same time optimizes the internal reflection stray light of the fourth lens.

[0076] In an exemplary embodiment, the imaging system according to the present application may satisfy: 3 < R5 / R4 < 4 and -22 < f3 / (T23 + EP23) < -18, where R4 is the radius of curvature of the image side of the second lens, R5 is the radius of curvature of the object side of the third lens, f3 is the effective focal length of the third lens, T23 is the air gap between the second lens and the third lens on the optical axis, and EP23 is the axial distance from the image side of the second spacer element to the object side of the third spacer element. Satisfying 3 < R5 / R4 < 4 and -22 < f3 / (T23 + EP23) < -18 restricts the radius of curvature of the adjacent surfaces of the second lens and the third lens, and under the premise of ensuring the effective focal length of the third lens, restricts the air gap between the second lens and the third lens and the edge thickness of the third lens, ensuring the molding processability of the lens.

[0077] In an exemplary embodiment, the imaging system according to the present application may satisfy: 0.9 < (CT5 + CP5) / T45 < 2.5, where CT5 is the central thickness of the fifth lens on the optical axis, CP5 is the thickness of the fifth spacer element along the optical axis direction, and T45 is the air gap between the fourth lens and the fifth lens on the optical axis. Satisfying 0.9 < (CT5 + CP5) / T45 < 2.5 restricts the central thickness of the fifth lens, the thickness of the fifth spacer element along the optical axis direction, and the air gap between the fourth lens and the fifth lens on the optical axis, indirectly restricting the position of the fifth lens in the optical system and the sagittal height of the image side, which is beneficial to optimizing the light path and improving the imaging quality.

[0078] In an exemplary embodiment, the imaging system according to the present application may satisfy: 1.5 < f56 / (d6m - d5m) < 5.5, where f56 is the combined focal length of the fifth lens and the sixth lens, d5m is the inner diameter of the image side of the fifth spacer element, and d6m is the inner diameter of the image side of the sixth spacer element. Satisfying 1.5 < f56 / (d6m - d5m) < 5.5 restricts the inner diameter difference between the fifth spacer element and the sixth spacer element on the premise of ensuring the combined focal length of the fifth lens and the sixth lens, preventing the assembly from being unstable due to excessive difference and affecting the performance yield.

[0079] In an exemplary embodiment, the imaging system according to the present application may satisfy: 4 < R13 / R14 < 6 and 1 < CT7 / CP6 < 2, where R13 is the curvature radius of the object side of the seventh lens, R14 is the curvature radius of the image side of the seventh lens, CT7 is the central thickness of the seventh lens on the optical axis, and CP6 is the thickness of the sixth spacer element along the optical axis direction. Satisfying 4 < R13 / R14 < 6 and 1 < CT7 / CP6 < 2 restricts the curvature radius and central thickness of the object side and image side of the seventh lens, as well as the thickness of the sixth spacer element, preventing the risk of poor coating due to excessive curvature radius of the sixth lens and the seventh lens and the risk of molding due to uneven lens thickness.

[0080] In an exemplary embodiment, the imaging system according to the present application may satisfy: 0.8 < EP67 / CT7 < 1.8, where EP67 is the on-axis distance from the image side of the sixth spacer element to the object side of the seventh spacer element, and CT7 is the central thickness of the seventh lens on the optical axis. The seventh spacer element improves the reliability and pushing force of the entire lens, and at the same time blocks part of the stray light reflected between the seventh lens and the filter; satisfying 0.8 < EP67 / CT7 < , also restricts the central thickness and edge thickness of the seventh lens, preventing the risk of lens edge breakage caused by too thin edge thickness and stress concentration at the edge of the effective diameter of the seventh lens.

[0081] In an exemplary embodiment, the imaging system according to the present application may satisfy: -7.5 < f7 / (D7m - d7s) < -5, where f7 is the effective focal length of the seventh lens, D7m is the outer diameter of the image side of the seventh spacer element, and d7s is the inner diameter of the object side of the seventh spacer element. Satisfying -7.5 < f7 / (D7m - d7s) < -5 ensures the inner and outer diameter difference of the seventh spacer element on the premise of ensuring the effective focal length of the seventh lens, preventing the reliability risk caused by the seventh spacer element being too thin radially, and optimizing the stray light generated by the inner diameter inclined surface of the seventh spacer element. At the same time, ensure that the image side of the seventh spacer element has sufficient assembly adsorption size to ensure the processability.

[0082] In an exemplary embodiment, the imaging system according to the present application may satisfy: 1 < (D6bs - d6bm) / T67 < 3, where D6bs is the outer diameter of the object side surface of the sixth auxiliary spacer element, d6bm is the inner diameter of the image side surface of the sixth auxiliary spacer element, and T67 is the air gap between the sixth lens and the seventh lens on the optical axis. Satisfying 1 < (D6bs - d6bm) / T67 < 3, the sixth auxiliary spacer element blocks the primary reflection stray light of the sixth spacer element and part of the internal reflection stray light of the seventh lens. This conditional expression also restricts the difference between the outer and inner diameters of the sixth auxiliary spacer element and the air gap between the sixth lens and the seventh lens, preventing the annular zones where the sixth auxiliary spacer element abuts against the sixth spacer element and the seventh lens from being too wide, which may cause baking deformation and light leakage, while ensuring that the illuminance of the optical system meets the requirements.

[0083] [[ID=I3]]In an exemplary embodiment, the imaging system according to the present application may satisfy: 3.5 < d0s / DT11 < 4.2, where d0s is the inner diameter of the object side end face of the lens barrel, and DT11 is the diameter of the light-transmitting part of the object side surface of the first lens. Satisfying 3.5 < d0s / DT11 < 4.2, on the premise of ensuring the diameter of the light-transmitting part of the object side surface of the first lens, it restricts the inner diameter of the object side surface of the lens barrel, ensures the light input amount of the imaging system and the opening size of the lens barrel, and ensures the aperture number of the optical system.

[0084] In an exemplary embodiment, the lens barrel of the imaging system according to the present application includes a first lens barrel and a second lens barrel, and satisfies: 0 < d0m / d0bs < 1.8, where d0m is the inner diameter of the image side end face of the first lens barrel, and d0bs is the inner diameter of the object side end face of the second lens barrel. More specifically, d0m and d0bs may further satisfy: 1.0 < d0m / d0bs < 1.8. Satisfying 0 < d0m / d0bs < 1.8, on the premise of ensuring the inner diameter of the image side end face of the first lens barrel, it restricts the inner diameter of the object side end face of the second lens barrel, ensures that the lens barrel has sufficient thickness support, and prevents reliability risks caused by being too thin; at the same time, the first lens barrel and the second lens barrel can be connected by dispensing glue. Satisfying 0 < d0m / d0bs < 1.8 also helps to ensure that the dispensing width between the image side surface of the first lens and the object side surface of the second lens barrel is within a reasonable range, ensuring that the first lens can be firmly bonded to the second lens barrel and preventing the glue from overflowing into the effective diameter of the optics, resulting in the risk of light deformation.

[0085] In an exemplary embodiment, the imaging system according to the present application may satisfy: 0.8 < (d5m - d5bs) / T56 < 5, where d5m is the inner diameter of the image side of the fifth spacer element, d5bs is the inner diameter of the object side of the fifth auxiliary spacer element, and T56 is the air gap between the fifth lens and the sixth lens on the optical axis. Satisfying 0.8 < (d5m - d5bs) / T56 < 5, the fifth auxiliary spacer element blocks the primary reflected stray light of the fifth spacer element and part of the internal reflected stray light of the sixth lens. This conditional expression also restricts the cantilever length of the fifth auxiliary spacer element, avoiding the baking deformation stray light that may be caused by an overly long cantilever.

[0086] The imaging system according to an exemplary embodiment of the present application may include a lens group and a spacer element group. The lens group may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The first lens may have a positive optical power, the second lens may have a negative optical power, the third lens may have a negative optical power, the fourth lens may have a positive optical power, the fifth lens may have a negative optical power, the sixth lens may have a positive optical power, and the seventh lens may have a negative optical power. The spacer element group may include a second spacer element and a third spacer element. The second spacer element is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens. The third spacer element is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens. The imaging system may satisfy: 3 < R5 / R4 < 4 and -22 < f3 / (T23 + EP23) < -18, where R4 is the radius of curvature of the image side surface of the second lens, R5 is the radius of curvature of the object side surface of the third lens, f3 is the effective focal length of the third lens, T23 is the air gap between the second lens and the third lens on the optical axis, and EP23 is the axial distance from the image side surface of the second spacer element to the object side surface of the third spacer element. Satisfying 3 < R5 / R4 < 4 and -22 < f3 / (T23 + EP23) < -18 restricts the radii of curvature of the adjacent surfaces of the second lens and the third lens. On the premise of ensuring the effective focal length of the third lens, it restricts the air gap between the second lens and the third lens and the edge thickness of the third lens, ensuring the molding processability of the lens.

[0087] In an embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the mirror surfaces from the object side surface of the first lens to the image side surface of the seventh lens is an aspherical mirror surface. The characteristics of an aspherical lens are that the curvature changes continuously from the center of the lens to the periphery of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better radius of curvature characteristics and has the advantages of improving distortion aberration and improving astigmatism aberration. After using an aspherical lens, it is possible to eliminate the aberration that appears during imaging as much as possible, thereby improving the imaging quality. Optionally, the object side surfaces and image side surfaces of all the lenses from the first lens to the seventh lens are aspherical mirror surfaces.

[0088] In an exemplary embodiment, the imaging system may further include a filter for correcting color deviation and / or a protective glass for protecting a photosensitive element located on the imaging surface.

[0089] The imaging system according to the above-described embodiments of the present application can utilize multiple lenses, such as seven lenses as described above. By rationally allocating the optical power, surface shape, and arrangement of the spacer elements of each lens, the span of each gear of the lens and lens barrel is made more uniform, enhancing the light convergence capability and improving the imaging quality of the imaging system. The imaging system provided by this application has at least one of the following imaging advantages: a wide viewing angle, a large image area, high relative illumination, low chromatic aberration, and low ghosting, while also exhibiting good processability of each structural element. However, those skilled in the art will appreciate that the number of lenses comprising the imaging system can be varied to achieve the various results and advantages described herein without departing from the claimed technical solution. For example, while the embodiments describe seven lenses as an example, the imaging system is not limited to including seven lenses. If desired, the imaging system may also include other numbers of lenses.

[0090] The following further describes a specific embodiment of the imaging system applicable to the above-mentioned embodiment with reference to the accompanying drawings. Figures 2A to 3C Describe the imaging system 1001 according to embodiment 1, the imaging system 1002 according to embodiment 2, and the imaging system 1003 according to embodiment 3 of the present application; Figures 4A to 5C Describe the imaging system 2001 according to embodiment 4 of the present application, the imaging system 2002 according to embodiment 5, and the imaging system 2003 according to embodiment 6; Figures 6A to 7C An imaging system 3001 according to Example 7, an imaging system 3002 according to Example 8, and an imaging system 3003 according to Example 9 of the present application are described.

[0091] Example 1

[0092] Figure 2A FIG. 1 shows a schematic structural diagram of an imaging system 1001 according to Embodiment 1 of the present application. Figure 2A As shown, the imaging system 1001 includes a lens barrel, a lens group, and a spacer element group.

[0093] like Figure 2AAs shown, the lens barrel includes a first lens barrel P01 and a second lens barrel P02. The lens group includes, from object side to image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. The first lens E1 has an object-side surface S1 and an image-side surface S2. The second lens E2 has an object-side surface S3 and an image-side surface S4. The third lens E3 has an object-side surface S5 and an image-side surface S6. The fourth lens E4 has an object-side surface S7 and an image-side surface S8. The fifth lens E5 has an object-side surface S9 and an image-side surface S10. The sixth lens E6 has an object-side surface S11 and an image-side surface S12. The seventh lens E7 has an object-side surface S13 and an image-side surface S14.

[0094] Imaging system 1001 also includes a filter (not shown) for correcting chromatic aberration. The filter has an object-side surface S15 and an image-side surface S16. Imaging system 1001 also includes a stop STO (not shown) disposed on the object side of the first lens. Light from the object sequentially passes through surfaces S1 to S16 and is ultimately imaged on an imaging surface (not shown).

[0095] Table 1 shows basic parameters of the lens group of the imaging system 1001 of Example 1, wherein the units of curvature radius, thickness / distance and effective focal length are all millimeters (mm).

[0096]

[0097] Table 1

[0098] In Example 1, the object-side surface and the image-side surface of any lens among the first lens E1 to the seventh lens E7 are both aspherical surfaces. The surface shape x of each aspherical lens can be defined by, but is not limited to, the following aspherical surface formula:

[0099]

[0100] Wherein, x is the distance vector height of the aspheric surface from the vertex of the aspheric surface 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 1 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Tables 2-1 and 2-2 give the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 and A 30 .

[0101] Face number A4 A6 A8 A10 A12 A14 A16 S1 8.0964E-03 -1.4264E-03 -2.4115E-03 -1.0122E-03 -3.6559E-04 -3.7659E-05 7.0406E-06 S2 -3.5431E-02 1.6397E-02 -5.6682E-03 1.3947E-03 -1.4275E-05 -1.0341E-05 -1.9365E-05 S3 -6.7416E-02 3.3675E-02 -3.6666E-03 2.2898E-03 2.0287E-04 1.0966E-04 -4.7713E-06 S4 -7.0332E-03 1.1658E-02 -4.2277E-04 1.0667E-03 4.8575E-04 1.3761E-04 1.0797E-04 S5 -2.1625E-01 -6.3165E-03 -6.2402E-04 1.2215E-03 5.5142E-04 2.0591E-04 5.7433E-05 S6 -1.7468E-01 1.3268E-02 1.0579E-02 2.9351E-03 1.2506E-03 -7.9306E-05 -2.3094E-04 S7 -1.5927E-01 1.6975E-02 5.5488E-03 2.0852E-03 1.5466E-03 2.4632E-04 -2.5226E-04 S8 -3.5321E-01 -2.1184E-02 5.8881E-03 5.2504E-03 6.1518E-03 3.7960E-03 2.2587E-03 S9 -7.3608E-01 -1.1260E-02 9.0066E-04 -5.8755E-04 -1.6512E-03 2.7814E-03 1.0894E-03 S10 -1.3526E+00 4.4571E-01 -7.2650E-02 -1.7485E-02 -2.1675E-03 8.8320E-03 -3.3044E-03 S11 -2.1225E+00 2.2287E-01 1.5685E-01 -1.3038E-02 -2.7541E-02 -4.0809E-03 3.5376E-03 S12 -1.0787E+00 -1.6467E-01 1.9823E-01 -8.8676E-02 2.4047E-02 -7.5042E-03 6.3628E-03 S13 -2.5158E+00 1.3576E+00 -6.4208E-01 2.6320E-01 -1.0368E-01 3.2236E-02 -8.0723E-03 S14 -5.5314E+00 1.5106E+00 -4.7743E-01 2.1263E-01 -9.9021E-02 3.9252E-02 -3.1686E-02

[0102] Table 2-1

[0103] Face number A18 A20 A22 A24 A26 A28 A30 S1 3.2567E-05 8.4206E-06 2.3729E-05 1.5405E-05 1.4927E-05 -5.3340E-06 -2.3212E-06 S2 -2.2719E-05 7.8762E-06 -7.0922E-06 -5.1399E-06 -2.1850E-05 -1.9705E-05 -1.4945E-05 S3 1.7356E-05 -8.6059E-06 1.5356E-05 -9.4352E-06 9.7774E-07 -1.2749E-05 5.1315E-06 S4 1.0702E-05 2.5710E-05 -1.3865E-06 1.4482E-05 -2.0697E-06 6.2097E-06 -5.0052E-06 S5 2.0963E-05 9.1158E-06 6.7047E-06 -9.9856E-08 1.5882E-06 -3.0909E-06 1.7640E-06 S6 -1.1462E-04 1.7982E-05 2.6583E-06 1.5657E-05 3.8051E-06 3.9588E-06 0.0000E+00 S7 -1.3893E-04 8.6348E-06 -1.0676E-05 8.6967E-06 4.8703E-06 0.0000E+00 0.0000E+00 S8 8.6492E-04 5.0543E-04 9.4630E-05 7.6488E-05 -3.8371E-05 1.0610E-05 -2.5862E-05 S9 2.0413E-04 -1.1414E-04 9.5516E-05 5.5730E-05 7.4303E-05 1.8470E-05 3.8273E-05 S10 -1.0671E-03 7.9444E-04 8.2163E-04 5.2435E-05 3.6930E-04 3.0102E-04 1.4019E-04 S11 2.8933E-03 -1.4449E-03 -1.8690E-04 3.8828E-04 4.8971E-04 -3.5384E-05 1.0527E-05 S12 7.1142E-04 -1.8752E-03 -3.2968E-04 -4.5467E-04 2.1156E-04 -6.9018E-05 3.3513E-05 S13 5.4040E-04 -2.4623E-03 3.4929E-03 -2.4890E-03 8.2466E-04 2.5995E-05 -1.1425E-04 S14 1.5256E-02 -5.1724E-03 4.1928E-03 -2.6243E-03 4.4229E-04 -7.6252E-04 4.0557E-04

[0104] Table 2-2

[0105] Table 3 shows the effective focal length f of the imaging system 1001 and the combined focal length f56 of the fifth lens and the sixth lens in Example 1, where both f and f56 are expressed in millimeters (mm).

[0106] parameter f f56 Numerical 6.3613 10.1901

[0107] Table 3

[0108] like Figure 2A As shown, the imaging system 1001 further includes eight spacing elements, namely, a second spacing element P2, a third spacing element P3, a fourth spacing element P4, a fifth spacing element P5, a fifth auxiliary spacing element P5b, a sixth spacing element P6, a sixth auxiliary spacing element P6b and a seventh spacing element P7. The second spacer element P2 is positioned on the image side of the second lens and at least partially contacts the image side surface of the second lens; the third spacer element P3 is positioned on the image side of the third lens and at least partially contacts the image side surface of the third lens; the fourth spacer element P4 is positioned on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens; the fifth spacer element P5 is positioned on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; the fifth auxiliary spacer element P5b is positioned on the image side of the fifth spacer element and at least partially contacts the image side surface of the fifth spacer element; the sixth spacer element P6 is positioned on the image side of the sixth lens and at least partially contacts the image side surface of the sixth lens; the sixth auxiliary spacer element P6b is positioned on the image side of the sixth spacer element and at least partially contacts the image side surface of the sixth spacer element; and the seventh spacer element P7 is positioned on the image side of the seventh lens and at least partially contacts the image side surface of the seventh lens. Table 4 shows the basic parameters of the spacers of imaging system 1001. The units of each parameter in Table 4 are millimeters (mm). The above spacers can block the entry of excess external light, better support the lenses and the lens barrel, and enhance the structural stability of imaging system 1001.

[0109] parameter D2s d3m D4s d5s d5m d6s d6m d7s D7m d0s Numerical 5.4400 3.9350 7.5000 6.1318 7.1900 8.4518 9.9306 10.7432 11.5228 7.8000 parameter d0m d0bs CP2 EP23 CP3 EP45 CP5 EP56 CP6 EP67 Numerical 7.1386 4.7191 0.0160 0.6040 0.0160 0.7300 0.3400 0.8690 0.4700 0.8753 parameter d5bs d6bm D6bs / / / / / / / Numerical 6.3225 9.2903 11.5000 / / / / / / /

[0110] Table 4

[0111] Example 2

[0112] Figure 2BFIG2 is a schematic structural diagram of an imaging system 1002 according to Embodiment 2 of the present application. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to those in Embodiment 1 will be omitted.

[0113] like Figure 2B As shown, imaging system 1002 includes a lens barrel, a lens group, and a spacer element group. The lens barrel includes a first lens barrel P01 and a second lens barrel P02. The lens group of imaging system 1002 is exactly the same as the lens group of imaging system 1001 in Example 1 and will not be described in detail. Imaging system 1002 also includes a filter (not shown) for correcting color deviation, the filter having an object side surface S15 and an image side surface S16. Imaging system 1002 also includes a stop STO (not shown) arranged on the object side of the first lens. Light from the object passes through each surface S1 to S16 in sequence and is ultimately imaged on an imaging surface (not shown). The basic parameters of imaging system 1002 are detailed in Tables 1 to 3 and will not be described in detail.

[0114] like Figure 2B As shown, the imaging system 1002 further includes eight spacing elements, namely, a second spacing element P2, a third spacing element P3, a fourth spacing element P4, a fifth spacing element P5, a fifth auxiliary spacing element P5b, a sixth spacing element P6, a sixth auxiliary spacing element P6b and a seventh spacing element P7. The second spacer element P2 is positioned on the image side of the second lens and at least partially contacts the image side surface of the second lens; the third spacer element P3 is positioned on the image side of the third lens and at least partially contacts the image side surface of the third lens; the fourth spacer element P4 is positioned on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens; the fifth spacer element P5 is positioned on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; the fifth auxiliary spacer element P5b is positioned on the image side of the fifth spacer element and at least partially contacts the image side surface of the fifth spacer element; the sixth spacer element P6 is positioned on the image side of the sixth lens and at least partially contacts the image side surface of the sixth lens; the sixth auxiliary spacer element P6b is positioned on the image side of the sixth spacer element and at least partially contacts the image side surface of the sixth spacer element; and the seventh spacer element P7 is positioned on the image side of the seventh lens and at least partially contacts the image side surface of the seventh lens. Table 5 shows the basic parameters of the spacers of imaging system 1002. The units of each parameter in Table 5 are millimeters (mm). The above spacers can block the entry of excess external light, better support the lenses and the lens barrel, and enhance the structural stability of imaging system 1002.

[0115] parameter D2s d3m D4s d5s d5m d6s d6m d7s D7m d0s Numerical 5.4400 3.8950 6.8800 6.2318 7.2900 8.5518 10.0306 10.6432 11.4228 7.8002 parameter d0m d0bs CP2 EP23 CP3 EP45 CP5 EP56 CP6 EP67 Numerical 7.0386 4.7191 0.0160 0.6040 0.0160 0.6490 0.3400 0.8690 0.4700 0.8753 parameter d5bs d6bm D6bs / / / / / / / Numerical 6.3225 9.2903 11.4000 / / / / / / /

[0116] Table 5

[0117] Example 3

[0118] Figure 2CA schematic structural diagram of an imaging system 1003 according to embodiment 3 of the present application is shown.

[0119] like Figure 2C As shown, imaging system 1003 includes a lens barrel, a lens group and a spacer element group. The lens barrel includes a first lens barrel P01 and a second lens barrel P02. The lens group of imaging system 1003 is exactly the same as the lens group of imaging system 1001 in Example 1 and will not be described in detail. Imaging system 1003 also includes a filter (not shown) for correcting color deviation, the filter having an object side surface S15 and an image side surface S16. Imaging system 1003 also includes a stop STO (not shown) arranged on the object side of the first lens. Light from the object passes through each surface S1 to S16 in sequence and is finally imaged on the imaging surface (not shown). The basic parameters of imaging system 1003 are detailed in Tables 1 to 3 and will not be described in detail.

[0120] like Figure 2C As shown, imaging system 1003 further includes seven spacers: a second spacer P2, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a sixth spacer P6, a sixth auxiliary spacer P6b, and a seventh spacer P7. Second spacer P2 is positioned on the image side of the second lens and in at least partial contact with the image-side surface of the second lens; third spacer P3 is positioned on the image side of the third lens and in at least partial contact with the image-side surface of the third lens; fourth spacer P4 is positioned on the image side of the fourth lens and in at least partial contact with the image-side surface of the fourth lens; fifth spacer P5 is positioned on the image side of the fifth lens and in at least partial contact with the image-side surface of the fifth lens; sixth spacer P6 is positioned on the image side of the sixth lens and in at least partial contact with the image-side surface of the sixth lens; sixth auxiliary spacer P6b is positioned on the image side of the sixth spacer and in at least partial contact with the image-side surface of the sixth spacer; and seventh spacer P7 is positioned on the image side of the seventh lens and in at least partial contact with the image-side surface of the seventh lens. Table 6 shows basic parameters of the spacers of imaging system 1003. The units of each parameter in Table 6 are millimeters (mm). The above-mentioned spacer element can block the entry of excess external light, thereby better supporting the lens and the lens barrel, and enhancing the structural stability of the imaging system 1003.

[0121] parameter D2s d3m D4s d5s d5m d6s d6m d7s D7m d0s Numerical 5.4400 3.9350 7.4000 5.9954 5.9954 8.4918 9.9706 10.7432 11.6228 7.8000 parameter d0m d0bs CP2 EP23 CP3 EP45 CP5 EP56 CP6 EP67 Numerical 7.2386 4.7191 0.0160 0.6040 0.0160 0.9200 0.0190 0.9500 0.4700 0.8753 parameter / d6bm D6bs / / / / / / / Numerical / 9.2903 11.5000 / / / / / / /

[0122] Table 6

[0123] Figure 3A The axial chromatic aberration curves of the imaging system 1001 of Example 1, the imaging system 1002 of Example 2, and the imaging system 1003 of Example 3 are shown, which represent the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 3BAstigmatism curves of the imaging system 1001 of Example 1, the imaging system 1002 of Example 2, and the imaging system 1003 of Example 3 are shown, which represent meridional field curvature and sagittal field curvature. Figure 3C The distortion curves of the imaging system 1001 of Example 1, the imaging system 1002 of Example 2, and the imaging system 1003 of Example 3 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figures 3A to 3C It can be seen that the imaging system 1001 of Example 1, the imaging system 1002 of Example 2, and the imaging system 1003 of Example 3 can all achieve good imaging quality.

[0124] Example 4

[0125] Figure 4A FIG. 2 shows a schematic structural diagram of an imaging system 2001 according to Embodiment 4 of the present application. Figure 4A As shown, the imaging system 2001 includes a lens barrel, a lens group, and a spacer element group.

[0126] like Figure 4A As shown, the lens barrel includes a first lens barrel P01 and a second lens barrel P02. The lens group includes, from object side to image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. The first lens E1 has an object-side surface S1 and an image-side surface S2. The second lens E2 has an object-side surface S3 and an image-side surface S4. The third lens E3 has an object-side surface S5 and an image-side surface S6. The fourth lens E4 has an object-side surface S7 and an image-side surface S8. The fifth lens E5 has an object-side surface S9 and an image-side surface S10. The sixth lens E6 has an object-side surface S11 and an image-side surface S12. The seventh lens E7 has an object-side surface S13 and an image-side surface S14.

[0127] Imaging system 2001 also includes a filter (not shown) for correcting chromatic aberration. The filter has an object-side surface S15 and an image-side surface S16. Imaging system 2001 also includes a stop STO (not shown) disposed on the object side of the first lens. Light from the object sequentially passes through surfaces S1 to S16 and is ultimately imaged on an imaging surface (not shown).

[0128] Table 7 shows the basic parameters of the lens group of the imaging system 2001 of Example 4, wherein the units of curvature radius, thickness / distance and effective focal length are all millimeters (mm).

[0129]

[0130]

[0131] Table 7

[0132] Tables 8-1 and 8-2 show the high-order coefficients of each aspherical mirror surface that can be used in Example 4, wherein the surface shape of each aspherical surface can be defined by formula (1) given in Example 1 above.

[0133] Face number A4 A6 A8 A10 A12 A14 A16 S1 1.2412E-02 -2.4144E-03 -3.9817E-03 -1.6851E-03 -7.7020E-04 -1.3551E-04 -5.7260E-05 S2 -3.9230E-02 1.6656E-02 -6.5457E-03 1.0872E-03 -5.8757E-05 1.0377E-04 1.6275E-05 S3 -7.3051E-02 3.2952E-02 -2.7144E-03 1.9561E-03 9.3617E-05 1.4022E-04 -3.0564E-06 S4 -1.1320E-02 1.0986E-02 1.1309E-03 8.6283E-04 3.7156E-04 9.2573E-05 7.8183E-05 S5 -2.1545E-01 -4.6253E-03 1.4025E-03 1.2986E-03 3.1975E-04 1.9015E-04 2.6184E-05 S6 -2.6821E-01 2.6091E-02 6.1948E-03 4.5305E-03 8.8017E-04 -1.2063E-04 -1.7792E-04 S7 -1.4714E-01 1.5833E-02 -3.2796E-04 4.7525E-03 1.1093E-03 -5.4485E-04 -4.1763E-04 S8 -3.7189E-01 -1.0026E-02 3.8476E-03 5.7669E-03 3.5950E-03 1.7779E-03 5.3621E-04 S9 -7.2230E-01 6.7752E-03 2.0814E-03 1.3297E-03 -3.7929E-03 6.1531E-05 2.5943E-04 S10 -1.3073E+00 4.3378E-01 -6.0332E-02 -2.2434E-02 -2.2220E-03 1.0458E-02 -1.5980E-03 S11 -3.0932E+00 3.1402E-01 1.7240E-01 -5.3359E-03 -3.0714E-02 -8.6819E-03 4.6601E-03 S12 -1.1037E+00 -2.5035E-01 1.9735E-01 -7.7093E-02 2.9038E-02 -8.1799E-03 1.9916E-03 S13 -3.0769E+00 1.4139E+00 -6.3796E-01 2.6120E-01 -9.7369E-02 2.7274E-02 -5.8246E-03 S14 -7.8139E+00 2.0113E+00 -6.1111E-01 2.2986E-01 -1.1832E-01 4.6447E-02 -3.1149E-02

[0134] Table 8-1

[0135] Face number A18 A20 A22 A24 A26 A28 A30 S1 4.1384E-05 -4.6759E-07 3.6247E-05 1.2465E-05 2.6264E-05 8.7894E-06 1.4123E-05 S2 -4.9979E-05 -5.3870E-05 -7.5299E-05 -6.1134E-05 -5.6544E-05 -2.9645E-05 -1.4567E-05 S3 2.7628E-05 -9.2189E-06 1.8589E-05 -2.2324E-06 1.1024E-05 -5.6003E-06 6.9861E-06 S4 1.1438E-06 2.1654E-05 -5.3842E-06 1.3619E-05 -5.6758E-06 6.1947E-06 -5.2204E-06 S5 4.0036E-05 -2.3465E-06 1.7611E-05 -6.8774E-06 5.5603E-06 -6.1758E-06 1.6754E-06 S6 5.4862E-05 -2.1036E-05 -1.2892E-05 -4.9539E-06 1.5806E-05 -2.9373E-06 0.0000E+00 S7 -1.7409E-05 -3.3445E-05 2.4104E-05 4.0066E-05 3.1983E-05 0.0000E+00 0.0000E+00 S8 9.4225E-05 -3.3637E-06 -3.7448E-05 -1.6433E-05 -2.0821E-05 -4.8358E-06 -7.7798E-06 S9 5.2431E-04 4.1478E-04 4.5597E-04 2.5853E-04 1.6530E-04 4.7567E-05 3.2746E-05 S10 -3.2439E-03 -6.6415E-04 5.5456E-04 2.4051E-04 1.6903E-04 1.3925E-04 8.4429E-05 S11 6.6443E-03 2.1427E-03 -3.3781E-04 -2.5098E-04 5.5645E-04 5.7852E-04 2.1689E-04 S12 -7.1045E-04 -6.6429E-04 -5.5729E-04 -6.5062E-04 -2.3742E-04 -1.7970E-04 -1.0449E-04 S13 2.2438E-03 -2.5470E-03 1.9464E-03 -1.0529E-03 3.0555E-04 -2.7951E-05 -4.3084E-05 S14 1.4995E-02 -5.5407E-03 2.7685E-03 -2.1891E-03 9.1182E-04 -8.0953E-04 1.7967E-04

[0136] Table 8-2

[0137] Table 9 shows the effective focal length f of the imaging system 2001 of Example 4 and the combined focal length f56 of the fifth lens and the sixth lens, where the units of f and f56 are both millimeters (mm).

[0138] parameter f f56 Numerical 6.3063 7.9792

[0139] Table 9

[0140] like Figure 4A As shown, the imaging system 2001 further includes eight spacing elements, namely, a second spacing element P2, a third spacing element P3, a fourth spacing element P4, a fifth spacing element P5, a fifth auxiliary spacing element P5b, a sixth spacing element P6, a sixth auxiliary spacing element P6b and a seventh spacing element P7. The second spacer element P2 is positioned on the image side of the second lens and at least partially contacts the image side surface of the second lens; the third spacer element P3 is positioned on the image side of the third lens and at least partially contacts the image side surface of the third lens; the fourth spacer element P4 is positioned on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens; the fifth spacer element P5 is positioned on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; the fifth auxiliary spacer element P5b is positioned on the image side of the fifth spacer element and at least partially contacts the image side surface of the fifth spacer element; the sixth spacer element P6 is positioned on the image side of the sixth lens and at least partially contacts the image side surface of the sixth lens; the sixth auxiliary spacer element P6b is positioned on the image side of the sixth spacer element and at least partially contacts the image side surface of the sixth spacer element; and the seventh spacer element P7 is positioned on the image side of the seventh lens and at least partially contacts the image side surface of the seventh lens. Table 10 shows the basic parameters of the spacers of imaging system 2001. The units of each parameter in Table 10 are millimeters (mm). The above spacers can block the entry of excess external light, better support the lenses and the lens barrel, and enhance the structural stability of imaging system 2001.

[0141] parameter D2s d3m D4s d5s d5m d6s d6m d7s D7m d0s Numerical 5.4400 3.8491 6.9800 6.1318 7.2535 9.0518 10.5306 11.3000 12.1228 7.8002 parameter d0m d0bs CP2 EP23 CP3 EP45 CP5 EP56 CP6 EP67 Numerical 7.1386 4.7191 0.0160 0.5040 0.0160 0.6690 0.4700 0.6690 0.4700 0.7053 parameter d5bs d6bm D6bs / / / / / / / Numerical 6.8821 9.5505 12.1000 / / / / / / /

[0142] Table 10

[0143] Example 5

[0144] Figure 4B A schematic structural diagram of an imaging system 2002 according to embodiment 5 of the present application is shown.

[0145] like Figure 4B As shown, imaging system 2002 includes a lens barrel, a lens group and a spacer element group. The lens barrel includes a first lens barrel P01 and a second lens barrel P02. The lens group of imaging system 2002 is exactly the same as the lens group of imaging system 2001 of Example 4, and will not be described in detail. Imaging system 2002 also includes a filter (not shown) for correcting color deviation, and the filter has an object side surface S15 and an image side surface S16. Imaging system 2002 also includes a stop STO (not shown) arranged on the object side of the first lens. Light from the object passes through each surface S1 to S16 in sequence and is finally imaged on the imaging surface (not shown). The basic parameters of imaging system 2002 are detailed in Tables 7 to 9, and will not be described in detail.

[0146] like Figure 4B As shown, the imaging system 2002 further includes seven spacers, namely a second spacer P2, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a sixth spacer P6, a sixth auxiliary spacer P6b, and a seventh spacer P7. The second spacer P2 is positioned on the image side of the second lens and in at least partial contact with the image side surface of the second lens; the third spacer P3 is positioned on the image side of the third lens and in at least partial contact with the image side surface of the third lens; the fourth spacer P4 is positioned on the image side of the fourth lens and in at least partial contact with the image side surface of the fourth lens; the fifth spacer P5 is positioned on the image side of the fifth lens and in at least partial contact with the image side surface of the fifth lens; the sixth spacer P6 is positioned on the image side of the sixth lens and in at least partial contact with the image side surface of the sixth lens; the sixth auxiliary spacer P6b is positioned on the image side of the sixth spacer and in at least partial contact with the image side surface of the sixth spacer; and the seventh spacer P7 is positioned on the image side of the seventh lens and in at least partial contact with the image side surface of the seventh lens. Table 11 shows the basic parameters of the spacer elements of imaging system 2002. The units of each parameter in Table 11 are millimeters (mm). The spacer elements can block the entry of excess external light, allowing the lens and lens barrel to better support each other, and enhancing the structural stability of imaging system 2002.

[0147] parameter D2s d3m D4s d5s d5m d6s d6m d7s D7m d0s Numerical 5.4400 3.8291 7.4000 6.2564 6.2564 8.9918 10.4706 11.3600 12.2228 7.8002 parameter d0m d0bs CP2 EP23 CP3 EP45 CP5 EP56 CP6 EP67 Numerical 7.2386 4.7191 0.0160 0.5040 0.0160 0.9700 0.0190 0.9840 0.4700 0.6833 parameter / d6bm D6bs / / / / / / / Numerical / 9.4505 12.2000 / / / / / / /

[0148] Table 11

[0149] Example 6

[0150] Figure 4C A schematic structural diagram of the imaging system 2003 according to Example 6 of the present application is shown.

[0151] like Figure 4C As shown, imaging system 2003 comprises a lens barrel, a lens group and a spacer element group. The lens barrel comprises a first lens barrel P01 and a second lens barrel P02. The lens group of imaging system 2003 is identical with the lens group of imaging system 2001 of Example 4, and will not be described in detail. Imaging system 2003 also comprises a filter (not shown) for correcting chromatic aberration, the filter having an object side surface S15 and an image side surface S16. Imaging system 2003 also comprises a stop STO (not shown) arranged on the object side of the first lens. Light from object passes through each surface S1 to S16 in sequence and is finally imaged on the imaging surface (not shown). The basic parameters of imaging system 2003 are detailed in Tables 7 to 9, and will not be described in detail.

[0152] like Figure 4C As shown, imaging system 2003 further includes six spacers: a second spacer P2, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a sixth spacer P6, and a seventh spacer P7. Second spacer P2 is positioned on the image side of the second lens and at least partially contacts the image-side surface of the second lens; third spacer P3 is positioned on the image side of the third lens and at least partially contacts the image-side surface of the third lens; fourth spacer P4 is positioned on the image side of the fourth lens and at least partially contacts the image-side surface of the fourth lens; fifth spacer P5 is positioned on the image side of the fifth lens and at least partially contacts the image-side surface of the fifth lens; sixth spacer P6 is positioned on the image side of the sixth lens and at least partially contacts the image-side surface of the sixth lens; and seventh spacer P7 is positioned on the image side of the seventh lens and at least partially contacts the image-side surface of the seventh lens. Table 12 shows basic parameters of the spacers of imaging system 2003. The units of each parameter in Table 12 are millimeters (mm). The above-mentioned spacer element can block the entry of excess external light, thereby better supporting the lens and the lens barrel, and enhancing the structural stability of the imaging system 2003.

[0153] parameter D2s d3m D4s d5s d5m d6s d6m d7s D7m d0s Numerical 5.4400 3.7891 7.5000 6.2164 6.2164 8.9918 10.4706 11.4000 12.3228 7.8000 parameter d0m d0bs CP2 EP23 CP3 EP45 CP5 EP56 CP6 EP67 Numerical 7.3386 4.7191 0.0160 0.5040 0.0160 0.9700 0.0190 0.9840 0.4500 0.8333

[0154] Table 12

[0155] Figure 5A The axial chromatic aberration curves of the imaging system 2001 of Example 4, the imaging system 2002 of Example 5, and the imaging system 2003 of Example 6 are shown, which represent the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 5B Astigmatism curves of the imaging system 2001 of Example 4, the imaging system 2002 of Example 5, and the imaging system 2003 of Example 6 are shown, which represent meridional field curvature and sagittal field curvature. Figure 5C The distortion curves of the imaging system 2001 of Example 4, the imaging system 2002 of Example 5, and the imaging system 2003 of Example 6 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figures 5A to 5C It can be seen that the imaging system 2001 of Example 4, the imaging system 2002 of Example 5, and the imaging system 2003 of Example 6 can all achieve good imaging quality.

[0156] Example 7

[0157] Figure 6A FIG. 3 shows a schematic structural diagram of an imaging system 3001 according to Example 7 of the present application. Figure 6A As shown, the imaging system 3001 includes a lens barrel, a lens group, and a spacer element group.

[0158] like Figure 6A As shown, the lens barrel includes a first lens barrel P01 and a second lens barrel P02. The lens group includes, from object side to image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. The first lens E1 has an object-side surface S1 and an image-side surface S2. The second lens E2 has an object-side surface S3 and an image-side surface S4. The third lens E3 has an object-side surface S5 and an image-side surface S6. The fourth lens E4 has an object-side surface S7 and an image-side surface S8. The fifth lens E5 has an object-side surface S9 and an image-side surface S10. The sixth lens E6 has an object-side surface S11 and an image-side surface S12. The seventh lens E7 has an object-side surface S13 and an image-side surface S14.

[0159] Imaging system 3001 also includes a filter (not shown) for correcting chromatic aberration. The filter has an object-side surface S15 and an image-side surface S16. Imaging system 3001 also includes a stop STO (not shown) disposed on the object side of the first lens. Light from the object sequentially passes through surfaces S1 to S16 and is ultimately imaged on an imaging surface (not shown).

[0160] Table 13 shows the basic parameters of the lens group of the imaging system 3001 of Example 7, where the units of curvature radius, thickness / distance and effective focal length are all millimeters (mm).

[0161]

[0162] Table 13

[0163] Tables 14-1 and 14-2 show the high-order coefficients of each aspherical mirror surface that can be used in Example 7, wherein the surface shape of each aspherical surface can be defined by formula (1) given in the above Example 1.

[0164]

[0165]

[0166] Table 14-1

[0167] Face number A18 A20 A22 A24 A26 A28 A30 S1 5.2536E-05 -4.9407E-06 4.0997E-05 1.2898E-05 3.1644E-05 1.0390E-05 1.8237E-05 S2 -6.3497E-05 -2.8596E-05 -2.6715E-05 -9.4708E-06 -1.7498E-05 -6.0720E-06 -7.1522E-06 S3 3.4421E-05 -2.6032E-05 2.3481E-05 -1.2314E-05 8.9541E-06 -1.4609E-05 1.1040E-05 S4 -2.6571E-07 2.9249E-05 -7.2160E-06 1.8495E-05 -5.3119E-06 1.0640E-05 -6.5990E-06 S5 3.1982E-05 7.5273E-06 1.2394E-05 -4.2995E-06 3.7306E-06 -4.3043E-06 8.6431E-07 S6 -3.5774E-05 5.6100E-06 -6.5453E-08 -8.2101E-06 8.8262E-06 4.4619E-07 0.0000E+00 S7 -6.6227E-05 -4.1329E-05 -1.4480E-05 -1.5304E-05 1.4866E-05 0.0000E+00 0.0000E+00 S8 2.3016E-04 5.3205E-05 -1.3371E-04 -5.9816E-05 -8.3704E-05 -1.8636E-05 -2.3174E-05 S9 -8.7156E-05 8.8879E-05 2.8984E-04 2.5776E-04 1.4462E-04 5.2011E-05 2.4561E-05 S10 -1.3192E-03 6.5931E-04 3.1089E-04 -3.0420E-04 -1.8165E-04 4.8591E-05 6.8284E-05 S11 2.5138E-03 -4.3361E-04 -9.5305E-04 -1.2028E-04 1.4846E-04 5.0175E-05 -1.8020E-05 S12 -1.4871E-03 -2.3593E-03 -1.6307E-03 -4.7263E-04 -1.5617E-04 -1.2346E-04 -1.3764E-05 S13 1.2247E-04 -1.8872E-03 1.9904E-03 -1.9476E-03 4.7259E-04 -3.4185E-06 -2.0077E-04 S14 1.4262E-02 -4.8106E-03 3.4043E-03 -2.5017E-03 2.2798E-04 -6.9344E-04 3.6424E-04

[0168] Table 14-2

[0169] Table 15 shows the effective focal length f of the imaging system 3001 of Example 7 and the combined focal length f56 of the fifth lens and the sixth lens, where the units of f and f56 are both millimeters (mm).

[0170] parameter f f56 Numerical 6.3013 9.5697

[0171] Table 15

[0172] like Figure 6A As shown, the imaging system 3001 further includes eight spacing elements, namely, a second spacing element P2, a third spacing element P3, a fourth spacing element P4, a fifth spacing element P5, a fifth auxiliary spacing element P5b, a sixth spacing element P6, a sixth auxiliary spacing element P6b and a seventh spacing element P7. The second spacer element P2 is positioned on the image side of the second lens and at least partially contacts the image side surface of the second lens; the third spacer element P3 is positioned on the image side of the third lens and at least partially contacts the image side surface of the third lens; the fourth spacer element P4 is positioned on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens; the fifth spacer element P5 is positioned on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; the fifth auxiliary spacer element P5b is positioned on the image side of the fifth spacer element and at least partially contacts the image side surface of the fifth spacer element; the sixth spacer element P6 is positioned on the image side of the sixth lens and at least partially contacts the image side surface of the sixth lens; the sixth auxiliary spacer element P6b is positioned on the image side of the sixth spacer element and at least partially contacts the image side surface of the sixth spacer element; and the seventh spacer element P7 is positioned on the image side of the seventh lens and at least partially contacts the image side surface of the seventh lens. Table 16 shows the basic parameters of the spacers of imaging system 3001. The units of each parameter in Table 16 are millimeters (mm). The above spacers can block the entry of excess external light, better support the lenses and the lens barrel, and enhance the structural stability of imaging system 3001.

[0173] parameter D2s d3m D4s d5s d5m d6s d6m d7s D7m d0s Numerical 5.4400 3.9371 6.9800 6.6063 7.4809 9.0518 10.2300 11.2000 12.1228 7.8002 parameter d0m d0bs CP2 EP23 CP3 EP45 CP5 EP56 CP6 EP67 Numerical 7.1386 4.7191 0.0160 0.5840 0.0160 0.6690 0.3600 0.6890 0.4700 0.7253 parameter d5bs d6bm D6bs / / / / / / / Numerical 6.9236 9.5505 12.1000 / / / / / / /

[0174] Table 16

[0175] Example 8

[0176] Figure 6B A schematic structural diagram of an imaging system 3002 according to Example 8 of the present application is shown.

[0177] like Figure 6BAs shown, imaging system 3002 includes a lens barrel, a lens group, and a spacer element group. The lens barrel includes a first lens barrel P01 and a second lens barrel P02. The lens group of imaging system 3002 is exactly the same as the lens group of imaging system 3001 in Example 7 and will not be described in detail. Imaging system 3002 also includes a filter (not shown) for correcting color deviation, the filter having an object side surface S15 and an image side surface S16. Imaging system 3002 also includes a stop STO (not shown) arranged on the object side of the first lens. Light from the object passes through each surface S1 to S16 in sequence and is ultimately imaged on the imaging surface (not shown). The basic parameters of imaging system 3002 are detailed in Tables 13 to 15 and will not be described in detail.

[0178] like Figure 6B As shown, imaging system 3002 further includes six spacers: a second spacer P2, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a fifth auxiliary spacer P5b, and a sixth spacer P6. Second spacer P2 is positioned on the image side of the second lens and in at least partial contact with the image-side surface of the second lens; third spacer P3 is positioned on the image side of the third lens and in at least partial contact with the image-side surface of the third lens; fourth spacer P4 is positioned on the image side of the fourth lens and in at least partial contact with the image-side surface of the fourth lens; fifth spacer P5 is positioned on the image side of the fifth lens and in at least partial contact with the image-side surface of the fifth lens; fifth auxiliary spacer P5b is positioned on the image side of the fifth spacer and in at least partial contact with the image-side surface of the fifth spacer; and sixth spacer P6 is positioned on the image side of the sixth lens and in at least partial contact with the image-side surface of the sixth lens. Table 17 shows basic parameters of the spacers of imaging system 3002. The units of each parameter in Table 17 are millimeters (mm). The above-mentioned spacer elements can block the entry of excess external light, thereby better supporting the lens and the lens barrel, and enhancing the structural stability of the imaging system 3002.

[0179] parameter D2s d3m D4s d5s d5m d6s d6m / / d0s Numerical 5.4400 3.9171 7.0800 6.6063 7.4809 9.2855 9.5668 / / 7.4200 parameter d0m d0bs CP2 EP23 CP3 EP45 CP5 EP56 CP6 / Numerical 10.4995 9.8340 0.0160 0.5840 0.0160 0.6690 0.3600 0.5890 0.3800 / parameter d5bs / / / / / / / / / Numerical 6.9036 / / / / / / / / /

[0180] Table 17

[0181] Example 9

[0182] Figure 6C A schematic structural diagram of an imaging system 3003 according to Example 9 of the present application is shown.

[0183] like Figure 6CAs shown, imaging system 3003 includes a lens barrel, a lens group, and a spacer element group. The lens barrel only includes the first lens barrel P01. The lens group of imaging system 3003 is exactly the same as the lens group of imaging system 3001 in Example 7, and will not be described in detail. Imaging system 3003 also includes a filter (not shown) for correcting color deviation, the filter having an object side surface S15 and an image side surface S16. Imaging system 3003 also includes a stop STO (not shown) arranged on the object side of the first lens. Light from the object passes through each surface S1 to S16 in sequence and is finally imaged on the imaging surface (not shown). The basic parameters of imaging system 3003 are detailed in Tables 13 to 15, and will not be described in detail.

[0184] like Figure 6C As shown, imaging system 3003 further includes six spacers: a second spacer P2, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a fifth auxiliary spacer P5b, and a sixth spacer P6. Second spacer P2 is positioned on the image side of the second lens and in at least partial contact with the image-side surface of the second lens; third spacer P3 is positioned on the image side of the third lens and in at least partial contact with the image-side surface of the third lens; fourth spacer P4 is positioned on the image side of the fourth lens and in at least partial contact with the image-side surface of the fourth lens; fifth spacer P5 is positioned on the image side of the fifth lens and in at least partial contact with the image-side surface of the fifth lens; fifth auxiliary spacer P5b is positioned on the image side of the fifth spacer and in at least partial contact with the image-side surface of the fifth spacer; and sixth spacer P6 is positioned on the image side of the sixth lens and in at least partial contact with the image-side surface of the sixth lens. Table 18 shows basic parameters of the spacers of imaging system 3003. The units of each parameter in Table 18 are millimeters (mm). The above-mentioned spacer element can block the entry of excess external light, thereby better supporting the lens and the lens barrel, and enhancing the structural stability of the imaging system 3003.

[0185] parameter D2s d3m D4s d5s d5m d6s d6m / / d0s Numerical 5.4400 3.8971 7.1800 6.7063 7.5809 9.1455 9.4268 / / 7.4200 parameter d0m / CP2 EP23 CP3 EP45 CP5 EP56 CP6 / Numerical 10.6628 / 0.0160 0.5840 0.0160 0.6690 0.3600 0.5890 0.3800 / parameter d5bs d6bm D6bs / / / / / / / Numerical 6.8836 9.5960 10.9144 / / / / / / /

[0186] Table 18

[0187] Figure 7A The axial chromatic aberration curves of the imaging system 3001 of Example 7, the imaging system 3002 of Example 8, and the imaging system 3003 of Example 9 are shown, which represent the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 7B Astigmatism curves of the imaging system 3001 of Example 7, the imaging system 3002 of Example 8, and the imaging system 3003 of Example 9 are shown, which represent meridional field curvature and sagittal field curvature. Figure 7C The distortion curves of the imaging system 3001 of Example 7, the imaging system 3002 of Example 8, and the imaging system 3003 of Example 9 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. 7A to 7C It can be seen that the imaging system 3001 of Example 7, the imaging system 3002 of Example 8, and the imaging system 3003 of Example 9 can all achieve good imaging quality.

[0188] In summary, the imaging systems of Examples 1 to 9 satisfy the relationship shown in Table 19.

[0189] Conditional formula / Example 1 2 3 4 5 6 7 8 9 CT4 / T45 1.4549 1.4549 1.4549 1.5616 1.5616 1.5616 1.5906 1.5906 1.5906 (d6s-d5s) / CT6 3.2613 3.2613 3.5092 3.8367 3.5942 3.6468 3.2657 3.5778 3.2573 T45 / (CT4-CT5) 2.2710 2.2710 2.2710 2.9334 2.9334 2.9334 2.2253 2.2253 2.2253 (CT6+CT7) / CP6 3.1093 3.1093 3.1093 2.8959 2.8959 3.0246 3.0872 3.8184 3.8184 EP56 / (EP45-CP5) 2.2282 2.8123 1.0544 3.3618 1.0347 1.0347 2.2298 1.9061 1.9061 CT4 / CP3 51.8032 51.8032 51.8032 53.1292 53.1292 53.1292 53.4098 53.4098 53.4098 (CT2-CT3) / CP2 0.9120 0.9120 0.9120 13.0933 13.0933 13.0933 4.7623 4.7623 4.7623 EP45 / CT5 1.2618 1.1218 1.5902 1.0058 1.4584 1.4584 1.0901 1.0901 1.0901 f1 / R1 2.7176 2.7176 2.7176 2.6511 2.6511 2.6511 2.8609 2.8609 2.8609 f2 / D2s -11.5186 -11.5186 -11.5186 -8.6066 -8.6066 -8.6066 -17.3844 -17.3844 -17.3844 CT2 / (T12+CP2) 3.4857 3.4857 3.4857 5.1081 5.1081 5.1081 3.9005 3.9005 3.9005 f4 / (D4s-d3m) 3.8265 4.5699 3.9369 6.0931 5.3423 5.1408 4.3813 4.2150 4.0610 f3 / (T23+EP23) -19.5156 -19.5156 -19.5156 -21.2855 -21.2855 -21.2855 -18.5640 -18.5640 -18.5640 R5 / R4 3.4582 3.4582 3.4582 3.4443 3.4443 3.4443 3.6122 3.6122 3.6122 (CT5+CP5) / T45 1.6108 1.6108 1.0479 2.0833 1.2556 1.2556 1.8106 1.8106 1.8106 f56 / (d6m-d5m) 3.7183 3.7183 2.5634 2.4349 1.8934 1.8756 3.4810 4.5878 5.1843 R13 / R14 4.6451 4.6451 4.6451 5.0396 5.0396 5.0396 5.0735 5.0735 5.0735 CT7 / CP6 1.5957 1.5957 1.5957 1.2766 1.2766 1.3333 1.4939 1.8477 1.8477 EP67 / CT7 1.1671 1.1671 1.1671 1.1755 1.1388 1.3888 1.0330 / / f7 / (D7m-d7s) -6.8551 -6.8551 -6.0757 -6.5341 -6.2312 -5.8261 -5.8283 / / (D6bs-d6bm) / T67 2.4205 2.3109 2.4205 2.5298 2.7283 / 2.5866 / 1.3376 d0s / DT11 3.9436 3.9437 3.9436 3.9803 3.9803 3.9802 3.9839 3.7897 3.7897 d0m / d0bs 1.5127 1.4915 1.5339 1.5127 1.5339 1.5551 1.5127 1.0677 / (d5m-d5bs) / T56 4.0706 4.5399 / 0.9967 / / 2.6173 2.7112 3.2748

[0190] Table 19

[0191] The present application also provides an imaging device, wherein the electronic photosensitive element thereof may be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The imaging device may be a standalone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the imaging system described above.

[0192] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the inventive concept. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An imaging system, characterized in that: include: A lens group, comprising, in order from the object side to the image side along the optical axis: a first lens having positive power, a second lens having negative power, a third lens having negative power, a fourth lens having positive power, a fifth lens having negative power, a sixth lens having positive power, and a seventh lens having negative power; A spacer element group, comprising: a second spacer element and a third spacer element, wherein the second spacer element is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens, and the third spacer element is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens; The number of lenses having optical power in the imaging system is seven; The center thickness CT4 of the fourth lens on the optical axis and the air interval T45 between the fourth lens and the fifth lens on the optical axis satisfy: 1.4549≤CT4 / T45≤1.5906; The center thickness CT2 of the second lens on the optical axis, the center thickness CT3 of the third lens on the optical axis, and the thickness CP2 of the second spacer element along the optical axis satisfy: 0.9120≤(CT2-CT3) / CP2≤13.0933; The center thickness CT4 of the fourth lens on the optical axis and the thickness CP3 of the third spacing element along the optical axis satisfy: 51.8032≤CT4 / CP3≤53.4098.

2. The imaging system according to claim 1, characterized in that The spacer element group further includes: a fourth spacer element, a fifth spacer element and a sixth spacer element, wherein the fourth spacer element is disposed on the image side of the fourth lens and is in at least partial contact with the image side surface of the fourth lens, the fifth spacer element is disposed on the image side of the fifth lens and is in at least partial contact with the image side surface of the fifth lens, and the sixth spacer element is disposed on the image side of the sixth lens and is in at least partial contact with the image side surface of the sixth lens; The air interval T45 between the fourth lens and the fifth lens on the optical axis, the center thickness CT4 of the fourth lens on the optical axis, and the center thickness CT5 of the fifth lens on the optical axis satisfy: 2.2253≤T45 / (CT4-CT5)≤2.9334; The on-axis distance EP45 from the image side surface of the fourth spacer element to the object side surface of the fifth spacer element, the on-axis distance EP56 from the image side surface of the fifth spacer element to the object side surface of the sixth spacer element, and the thickness CP5 of the fifth spacer element along the optical axis satisfy: 1.0347≤EP56 / (EP45-CP5)≤3.3618.

3. The imaging system according to claim 1, characterized in that The spacer element group further includes: a sixth spacer element disposed on the image side of the sixth lens and at least partially in contact with the image side surface of the sixth lens; The center thickness CT6 of the sixth lens on the optical axis, the center thickness CT7 of the seventh lens on the optical axis, and the thickness CP6 of the sixth spacer element along the optical axis satisfy: 2.8959≤(CT6+CT7) / CP6≤3.8184.

4. The imaging system according to claim 1, characterized in that The spacer element group further includes: a fifth spacer element and a sixth spacer element, wherein the fifth spacer element is disposed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens, and the sixth spacer element is disposed on the image side of the sixth lens and at least partially contacts the image side surface of the sixth lens; An inner diameter d5s of the object side surface of the fifth spacer element, an inner diameter d6s of the object side surface of the sixth spacer element, and a center thickness CT6 of the sixth lens on the optical axis satisfy: 3.2573≤(d6s-d5s) / CT6≤3.8367.

5. The imaging system according to claim 1, characterized in that The spacer element group further includes: a fourth spacer element and a fifth spacer element, wherein the fourth spacer element is disposed on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens, and the fifth spacer element is disposed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; An axial distance EP45 from the image side surface of the fourth spacer element to the object side surface of the fifth spacer element and a center thickness CT5 of the fifth lens on the optical axis satisfy: 1.0058≤EP45 / CT5≤1.5902.

6. The imaging system according to claim 1, characterized in that: The imaging system satisfies: 2.6511≤f1 / R1≤2.8609 and -17.3844≤f2 / D2s≤-8.6066, wherein f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, R1 is the radius of curvature of the object side of the first lens, and D2s is the outer diameter of the object side of the second spacer element.

7. The imaging system according to claim 1, characterized in that: The imaging system satisfies: 3.4857≤CT2 / (T12+CP2)≤5.1081, wherein CT2 is the center thickness of the second lens on the optical axis, T12 is the air spacing between the first lens and the second lens on the optical axis, and CP2 is the thickness of the second spacing element along the optical axis.

8. The imaging system according to claim 1, characterized in that: The spacer element group further includes: a fourth spacer element disposed on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens; The imaging system satisfies: 3.8265≤f4 / (D4s-d3m)≤6.0931, wherein f4 is the effective focal length of the fourth lens, D4s is the outer diameter of the object side surface of the fourth spacing element, and d3m is the inner diameter of the image side surface of the third spacing element.

9. The imaging system according to claim 1, characterized in that: The imaging system satisfies: 3.4443≤R5 / R4≤3.6122 and -21.2855≤f3 / (T23+EP23)≤-18.5640, wherein R4 is the radius of curvature of the image side surface of the second lens, R5 is the radius of curvature of the object side surface of the third lens, f3 is the effective focal length of the third lens, T23 is the air spacing between the second lens and the third lens on the optical axis, and EP23 is the on-axis distance from the image side surface of the second spacing element to the object side surface of the third spacing element.

10. The imaging system according to claim 1, characterized in that The spacer element group further includes: a fifth spacer element disposed on the image side of the fifth lens and at least partially in contact with the image side surface of the fifth lens; The imaging system satisfies: 1.0479≤(CT5+CP5) / T45≤2.0833, wherein CT5 is the center thickness of the fifth lens on the optical axis, CP5 is the thickness of the fifth spacing element along the optical axis, and T45 is the air spacing between the fourth lens and the fifth lens on the optical axis.

11. The imaging system according to claim 1, characterized in that: The spacer element group further includes: a fifth spacer element and a sixth spacer element, wherein the fifth spacer element is disposed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens, and the sixth spacer element is disposed on the image side of the sixth lens and at least partially contacts the image side surface of the sixth lens; The imaging system satisfies: 1.8756≤f56 / (d6m-d5m)≤5.1843, wherein f56 is the combined focal length of the fifth lens and the sixth lens, d5m is the inner diameter of the image side surface of the fifth spacing element, and d6m is the inner diameter of the image side surface of the sixth spacing element.

12. The imaging system according to claim 1, characterized in that The spacer element group further includes: a sixth spacer element disposed on the image side of the sixth lens and at least partially in contact with the image side surface of the sixth lens; The imaging system satisfies: 4.6451≤R13 / R14≤5.0735 and 1.2766≤CT7 / CP6≤1.8477, wherein R13 is the radius of curvature of the object side surface of the seventh lens, R14 is the radius of curvature of the image side surface of the seventh lens, CT7 is the center thickness of the seventh lens on the optical axis, and CP6 is the thickness of the sixth spacing element along the optical axis.

13. The imaging system according to claim 1, characterized in that The spacer element group further includes: a sixth spacer element and a seventh spacer element, wherein the sixth spacer element is disposed on the image side of the sixth lens and at least partially contacts the image side surface of the sixth lens, and the seventh spacer element is disposed on the image side of the seventh lens and at least partially contacts the image side surface of the seventh lens; The imaging system satisfies: 1.0330≤EP67 / CT7≤1.3888, wherein EP67 is the on-axis distance from the image side surface of the sixth spacing element to the object side surface of the seventh spacing element, and CT7 is the center thickness of the seventh lens on the optical axis.

14. The imaging system according to any one of claims 1 to 12, characterized in that: The spacer element group further includes: a seventh spacer element disposed on the image side of the seventh lens and at least partially in contact with the image side surface of the seventh lens; The imaging system satisfies: -6.8551≤f7 / (D7m-d7s)≤-5.8261, wherein f7 is the effective focal length of the seventh lens, D7m is the outer diameter of the image side surface of the seventh spacing element, and d7s is the inner diameter of the object side surface of the seventh spacing element.

15. The imaging system according to any one of claims 1, 5 to 10, characterized in that: The spacer element group further includes: a sixth spacer element and a sixth auxiliary spacer element, wherein the sixth spacer element is disposed on the image side of the sixth lens and at least partially contacts the image side surface of the sixth lens, and the sixth auxiliary spacer element is disposed on the image side of the sixth spacer element and at least partially contacts the image side surface of the sixth spacer element; The imaging system satisfies: 1.3376≤(D6bs-d6bm) / T67≤2.7283, wherein D6bs is the outer diameter of the object side surface of the sixth auxiliary spacer element, d6bm is the inner diameter of the image side surface of the sixth auxiliary spacer element, and T67 is the air spacing between the sixth lens and the seventh lens on the optical axis.

16. The imaging system according to any one of claims 1 to 13, characterized in that: The imaging system further includes a lens barrel, and satisfies: 3.7897≤d0s / DT11≤3.9839, wherein d0s is the inner diameter of the object-side end surface of the lens barrel, and DT11 is the diameter of the light-transmitting portion of the object-side surface of the first lens.

17. The imaging system according to any one of claims 1 to 13, characterized in that: The imaging system further comprises a lens barrel, the lens barrel comprising a first lens barrel and a second lens barrel, the second lens barrel being disposed on the image side of the first lens barrel and connected to the first lens barrel; The imaging system satisfies: 1.0677≤d0m / d0bs≤1.5551, wherein d0m is the inner diameter of the image side end surface of the first lens barrel, and d0bs is the inner diameter of the object side end surface of the second lens barrel.

18. The imaging system according to any one of claims 1, 6 to 9, characterized in that: The spacer element group further includes: a fifth spacer element and a fifth auxiliary spacer element, wherein the fifth spacer element is disposed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens, and the fifth auxiliary spacer element is disposed on the image side of the fifth spacer element and at least partially contacts the image side surface of the fifth spacer element; The imaging system satisfies: 0.9967≤(d5m-d5bs) / T56≤4.5399, wherein d5m is the inner diameter of the image side surface of the fifth spacer element, d5bs is the inner diameter of the object side surface of the fifth auxiliary spacer element, and T56 is the air spacing between the fifth lens and the sixth lens on the optical axis.

Images