Optical imaging system and camera module comprising same

Abstract

The utility model discloses an optical imaging system and a camera module comprising the same. The optical imaging system comprises a lens barrel, and a lens group and a plurality of spacing elements which are accommodated in the lens barrel, the lens group comprises first to fifth lenses which are sequentially arranged from an object side to an image side along an optical axis, the first, second and fourth lenses respectively have positive focal power, and the third and fifth lenses respectively have negative focal power. And the plurality of spacing elements comprise first, second, third and fourth spacing elements which are respectively positioned on the image sides of the first, second, third and fourth lenses and are respectively at least partially contacted with the image side surfaces of the first, second, third and fourth lenses. The maximum height L of the lens barrel, the sum Sigma CT of the center thicknesses of the first to fifth lenses, the half Semi-FOV of the maximum field angle of the optical imaging system, the inner diameter d4s of the object side surface of the fourth spacing element, the inner diameter d2s of the object side surface of the second spacing element, and the effective focal lengths f2 and f4 of the second and fourth lenses meet the following conditions: 2.40 lt; l / sigma CTlt; 2.75, 12 degree lt; the method comprises the following steps: carrying out half-FOVlt; the angle is 25 degrees, and the angle is-0.24 lt; (d4s-d2s) / f2lt; 0.15 and-0.22 lt, 0.15 and-0.22 lt; (d4s-d2s) / f4lt; and 0.10.

Description

Technical Field

[0001] The present application relates to the field of optical elements, and more particularly, to an optical imaging system and an imaging module including the optical imaging system. Background Art

[0002] In recent years, with the rapid development of technology, people have more diverse requirements for the shooting function of mobile phones. They not only pursue the imaging ability of close-up scenes but also have high requirements for the imaging ability of distant scenes. At present, telephoto lenses have gradually become standard configurations for flagship models of various mobile phone manufacturers. At this stage, the optical imaging lenses applied to mobile phones only having a single telephoto characteristic are not sufficient to meet people's multi-functional shooting needs, and at the same time, they also need to have the characteristic of a large image plane to ensure the imaging quality.

[0003] Therefore, it is necessary to develop a lens design solution that can combine the characteristics of telephoto and large image plane, and at the same time meet the requirements such as thin and light and high imaging quality, and can be applied to the rear lens group of, for example, mobile phones to solve the problem that it is difficult to balance telephoto and large image plane in the existing optical imaging lenses. Summary of the Utility Model

[0004] The present application provides an optical imaging system, which may include a lens barrel and a lens group and a plurality of spacer elements accommodated in the lens barrel. Among them, the lens group includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged in sequence from the object side to the image side along the optical axis. The first lens has a positive optical power, the second lens has a positive optical power, the third lens has a negative optical power, the fourth lens has a positive optical power, and the fifth lens has a negative optical power; the plurality of spacer elements at least include: a first spacer element located on the image side of the first lens and at least partially in contact with the image side surface of the first lens; a second spacer element located on the image side of the second lens and at least partially in contact with the image side surface of the second lens; a third spacer element located on the image side of the third lens and at least partially in contact with the image side surface of the third lens; a fourth spacer element located on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens; the optical imaging system satisfies: 2.40 < L / ∑CT < 2.75, 12° < Semi-FOV < 25° and -0.24 < (d4s - d2s) / f2 < 0.15, -0.22 < (d4s - d2s) / f4 < 0.10, where L is the maximum height of the lens barrel, ∑CT is the sum of the central thicknesses of each lens on the optical axis from the first lens to the fifth lens, Semi-FOV is half of the maximum field of view angle of the optical imaging system, d4s is the inner diameter of the object side surface of the fourth spacer element, d2s is the inner diameter of the object side surface of the second spacer element, f2 is the effective focal length of the second lens, and f4 is the effective focal length of the fourth lens.

[0005] In one embodiment, the outer diameter D3s of the object side surface of the third spacer element, the maximum effective radius DT32 of the image side surface of the third lens, the outer diameter D4s of the object side surface of the fourth spacer element, and the maximum effective radius DT42 of the image side surface of the fourth lens satisfy: 2.18 < D3s / DT32 < 3.72 and 2.15 < D4s / DT42 < 2.75.

[0006] In one embodiment, the radius of curvature R2 of the image side surface of the second lens, the distance EP12 on the optical axis from the first spacer element to the second spacer element, and the refractive index N1 of the first lens satisfy: 7.34 < R2 / EP12×N1 < 13.45.

[0007] In one embodiment, the outer diameter D2m of the image side surface of the second spacer element, the inner diameter d3s of the object side surface of the third spacer element, the central thickness CT2 of the second lens on the optical axis, and the central thickness CT3 of the third lens on the optical axis satisfy: 1.23 < (D2m - d3s) / (CT2 + CT3) < 1.70.

[0008] In one embodiment, the air gap T34 on the optical axis between the third lens and the fourth lens, the maximum height L of the lens barrel, and the sum ∑AT of the air gaps on the optical axis between any two adjacent lenses with optical power in the optical imaging system satisfy: 0.38 < T34 / (L - ∑AT) < 0.80.

[0009] In one embodiment, the outer diameter D0s of the object side end surface of the lens barrel, the inner diameter d0s of the object side end surface of the lens barrel, the radius of curvature R2 of the image side surface of the first lens, and the radius of curvature R1 of the object side surface of the first lens satisfy: 4.78 < (D0s - d0s) / (R2 - R1) < 20.60.

[0010] In one embodiment, the outer diameter D3m of the image side surface of the third spacer element, the inner diameter d3m of the image side surface of the third spacer element, and the radius of curvature R6 of the image side surface of the third lens satisfy: 0.60 < (D3m - d3m) / R6 < 0.96.

[0011] In one embodiment, the outer diameter D4m of the image side surface of the fourth spacer element, the maximum effective radius DT51 of the object side surface of the fifth lens, and the inner diameter d4m of the image side surface of the fourth spacer element satisfy: 0.59 < (D4m - DT51) / d4m < 0.95.

[0012] In one embodiment, the distance EP34 on the optical axis from the third spacer element to the fourth spacer element, the radius of curvature R6 of the image side surface of the third lens, and the radius of curvature R7 of the object side surface of the fourth lens satisfy: 0.13 < EP34 / (R6 + |R7|) < 0.37.

[0013] In one embodiment, the outer diameter D2s of the object side surface of the second spacer element, the radius of curvature R3 of the object side surface of the second lens, the outer diameter D3s of the object side surface of the third spacer element, and the radius of curvature R5 of the object side surface of the third lens satisfy: 1.41 < D2s / R3 < 1.79 and 0.04 < D3s / R5 < 0.28.

[0014] In one embodiment, the plurality of spacer elements further includes: a third auxiliary spacer element, located on the image side of the third spacer element and at least partially in contact with the image side surface of the third spacer element; the outer diameter D3bm of the image side surface of the third auxiliary spacer element, the inner diameter d3bm of the image side surface of the third auxiliary spacer element, and the maximum effective radius DT41 of the object side surface of the fourth lens satisfy: 0.17 < (D3bm - d3bm) / DT41 < 0.94.

[0015] In one embodiment, the plurality of spacer elements further includes: a third auxiliary spacer element, located on the image side of the third spacer element and at least partially in contact with the image side surface of the third spacer element; the effective focal length f3 of the third lens, the maximum thickness CP3b of the third auxiliary spacer element in the optical axis direction, and the inner diameter d3s of the object side surface of the third spacer element satisfy: 10.80 mm < |f3| / CP3b × d3s < 15.59 mm.

[0016] In one embodiment, the sum ∑CP4 of the maximum thicknesses in the optical axis direction of one or more spacer elements including the fourth spacer element between the fourth lens and the fifth 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: 0.00 < ∑CP4 / (T45 + CT4 + CT5) < 0.66.

[0017] In one embodiment, the outer diameter D4s of the object side surface of the fourth spacer element, the inner diameter d3s of the object side surface of the third spacer element, and the distance EP34 on the optical axis from the third spacer element to the fourth spacer element satisfy: 0.61 < (D4s - d3s) / EP34 < 1.50.

[0018] In one embodiment, the lens barrel includes an object-side boss structure and an image-side boss structure. The object-side boss structure and the image-side boss structure protrude outward from the outer peripheral surface of the lens barrel at the object side end and the image side end of the lens barrel respectively. The object-side boss structure and the image-side boss structure form a groove with the outer peripheral surface of the lens barrel located between the two, and the groove is used for assembling the module connecting member.

[0019] On the other hand, the present application also provides an imaging module, which includes an optical imaging system provided according to any of the above embodiments, a module connecting member assembled to the lens barrel of the optical imaging system, and a module driving member for driving the optical imaging system through the module connecting member.

[0020] The optical imaging system according to the embodiment of the present application includes a lens barrel and a five-piece lens group and a plurality of spacer elements accommodated in the lens barrel. The first lens to the fifth lens are arranged in sequence from the object side to the image side along the optical axis. Among them, the first lens has a positive optical power, the second lens has a positive optical power, the third lens has a negative optical power, the fourth lens has a positive optical power, and the fifth lens has a negative optical power; the plurality of spacer elements include first, second, third, and fourth spacer elements respectively located on the image side of the first, second, third, and fourth lenses and at least partially in contact with the image side surfaces of the first, second, third, and fourth lenses; by controlling the maximum height L of the lens barrel and the sum ∑CT of the central thicknesses of the first lens to the fifth lens on the optical axis to satisfy the conditional formula 2.40 < L / ∑CT < 2.75, and controlling half of the maximum field of view Semi-FOV of the optical imaging system to satisfy the conditional formula 12° < Semi-FOV < 25°, it is beneficial to reduce the axial size of the lens, make the system meet the requirements of being thin and light, reasonably distribute the surface shapes and optical powers of each lens, which is beneficial to reducing the molding risk of the first to fifth lenses, increasing the assembly stability of the optical system, reducing the risk of mutual collision between each lens, and at the same time is also beneficial to balancing the low-order aberrations generated by the system, so that the system has good imaging quality; at the same time, further controlling the system to satisfy the conditional formulas -0.24 < (d4s - d2s) / f2 < 0.15, -0.22 < (d4s - d2s) / f4 < 0.10, by reasonably controlling the inner diameter d2s of the object side surface of the second spacer element and the inner diameter d4s of the object side surface of the fourth spacer element, non-imaging light in the system can be intercepted, and at the same time, by reasonably controlling the effective focal lengths f2 and f4 of the second lens and the fourth lens, the propagation path of light in the lens group can be changed, and the generation of stray light can be reduced. Description of the Drawings

[0021] Combined with the drawings, through the following detailed description of non-limiting embodiments, other features, objects, and advantages of the present application will become more obvious. In the drawings:

[0022] Figure 1A schematic diagram showing the structure and related parameters of an optical imaging system according to an exemplary embodiment of the present application is shown;

[0023] Figure 2 A schematic structural diagram of an optical imaging system according to Embodiment 1 of the present application is shown;

[0024] Figure 3 A schematic structural diagram of an optical imaging system according to Embodiment 2 of the present application is shown;

[0025] Figure 4 A schematic structural diagram of an optical imaging system according to Embodiment 3 of the present application is shown;

[0026] Figures 5 to 7 The astigmatism curve, distortion curve, and axial chromatic aberration curve of the optical imaging system according to Embodiment 1, Embodiment 2, and Embodiment 3 of the present application are respectively shown;

[0027] Figure 8 A schematic structural diagram of an optical imaging system according to Embodiment 4 of the present application is shown;

[0028] Fig. 9 A schematic structural diagram of an optical imaging system according to Embodiment 5 of the present application is shown;

[0029] Fig.10 A schematic structural diagram of an optical imaging system according to Embodiment 6 of the present application is shown;

[0030] Figures 11 to 13 The astigmatism curve, distortion curve, and axial chromatic aberration curve of the optical imaging system according to Embodiment 4, Embodiment 5, and Embodiment 6 of the present application are respectively shown;

[0031] Fig.14 A schematic structural diagram of an optical imaging system according to Embodiment 7 of the present application is shown;

[0032] Fig.15 A schematic structural diagram of an optical imaging system according to Embodiment 8 of the present application is shown;

[0033] Fig.16 A schematic structural diagram of an optical imaging system according to Embodiment 9 of the present application is shown;

[0034] Figures 17 to 19 The astigmatism curve, distortion curve, and axial chromatic aberration curve of the optical imaging system according to Embodiment 7, Embodiment 8, and Embodiment 9 of the present application are respectively shown;

[0035] Fig. 20 , Fig.21The stray light situation and the optical path diagram of the optical imaging system according to the exemplary embodiment of the present application are shown when the conditional formula (d4s-d2s) / f2=-0.45, (d4s-d2s) / f4=-0.60;

[0036] Fig. 22 , Fig.23 The figure shows the stray light situation and the optical path diagram of the optical imaging system according to the exemplary embodiment of the present application when the conditional formula (d4s-d2s) / f2=-0.09, (d4s-d2s) / f4=-0.10;

[0037] Fig.24 , Fig.25 The stray light situation and the optical path diagram of the optical imaging system according to the exemplary embodiment of the present application are shown when the conditional formula (d4s-d2s) / f2=0.08, (d4s-d2s) / f4=0.04; and

[0038] Fig.26 , Fig. 27 The stray light situation and light path diagram of the optical imaging system according to an exemplary embodiment of the present application are shown when the conditions (d4s-d2s) / f2=0.29 and (d4s-d2s) / f4=0.23. DETAILED DESCRIPTION

[0039] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only 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.

[0040] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0041] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0042] In this article, the paraxial area refers to the area near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial area; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial area. The judgment of the surface type in the paraxial area can be judged according to the general method in this field, for example, the positive and negative R value (R refers to the radius of curvature of the paraxial area) is used to judge the concave and convex. In this article, the surface of each lens closest to the subject is called the object side of the lens, and the surface of each lens closest to the imaging surface is called the image side of the lens. For the object side, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; for the image side, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface.

[0043] 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 exclude 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 listed 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.

[0044] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0045] It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The following embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can also be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0046] The features, principles and other aspects of the present application are described in detail below.

[0047] An optical imaging system according to an exemplary embodiment of the present application may include a lens barrel and a lens group and a plurality of spacer elements accommodated in the lens barrel. The lens group may be a five-element lens group, including a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged in sequence from the object side to the image side along the optical axis.

[0048] In an exemplary embodiment, the first lens may have a positive optical power; the second lens may have a positive 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.

[0049] In an exemplary embodiment, the object side surface of the first lens may be convex, and the image side surface may be concave. The object side surface of the second lens may be convex, and the image side surface may be convex. The object side surface of the third lens may be convex, and the image side surface may be concave. The object side surface of the fourth lens may be concave, and the image side surface may be convex. The object side surface of the fifth lens may be convex, and the image side surface may be concave.

[0050] In an exemplary embodiment, the plurality of spacer elements of the optical imaging system may at least include: a first spacer element located on the image side of the first lens and at least partially in contact with the image side surface of the first lens; a second spacer element located on the image side of the second lens and at least partially in contact with the image side surface of the second lens; a third spacer element located on the image side of the third lens and at least partially in contact with the image side surface of the third lens; and a fourth spacer element located on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens.

[0051] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 2.40 < L / ∑CT < 2.75, where L is the maximum height of the lens barrel in the direction along or parallel to the optical axis, and ∑CT is the sum of the central thicknesses of each of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens on the optical axis in the optical imaging system.

[0052] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 12° < Semi-FOV < 25°, where Semi-FOV is half of the maximum field of view angle of the optical imaging system.

[0053] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formulas -0.24 < (d4s - d2s) / f2 < 0.15, -0.22 < (d4s - d2s) / f4 < 0.10, where d4s is the inner diameter of the object side surface of the fourth spacer element, d2s is the inner diameter of the object side surface of the second spacer element, f2 is the effective focal length of the second lens, and f4 is the effective focal length of the fourth lens.

[0054] An optical imaging system according to an embodiment of the present application includes a lens barrel, a five-piece lens group, and a plurality of spacer elements accommodated in the lens barrel. The first lens to the fifth lens are arranged in sequence from the object side to the image side along the optical axis. Among them, the first lens has a positive optical power, the second lens has a positive optical power, the third lens has a negative optical power, the fourth lens has a positive optical power, and the fifth lens has a negative optical power; the plurality of spacer elements at least include first, second, third, and fourth spacer elements respectively located on the image sides of the first, second, third, and fourth lenses and at least partially in contact with the image side surfaces of the first, second, third, and fourth lenses; by controlling that the maximum height L of the lens barrel and the sum ∑CT of the central thicknesses of the first lens to the fifth lens on the optical axis satisfy the conditional formula 2.40 < L / ∑CT < 2.75, and controlling that half of the maximum field of view angle Semi-FOV of the optical imaging system satisfies the conditional formula 12° < Semi-FOV < 25°, it is beneficial to reduce the axial size of the lens, make the system meet the requirements of being thin and light, reasonably distribute the surface shapes and optical powers of each lens, which is beneficial to reducing the molding risk of the first to fifth lenses, increasing the assembly stability of the optical system, reducing the risk of mutual collision between each lens, and at the same time is also beneficial to balancing the low-order aberrations generated by the system, so that the system has good imaging quality; at the same time, in order to effectively avoid the generation of system stray light, further control the system to satisfy the conditional formulas -0.24 < (d4s - d2s) / f2 < 0.15 and -0.22 < (d4s - d2s) / f4 < 0.10. By reasonably controlling the inner diameter d2s of the object side surface of the second spacer element and the inner diameter d4s of the object side surface of the fourth spacer element, non-imaging light rays in the system can be intercepted. At the same time, by reasonably controlling the effective focal lengths f2 and f4 of the second lens and the fourth lens, the propagation path of light rays in the lens group can be changed, and the generation of stray light can be reduced.

[0055] See attached Figures 20 to 27 , the optical imaging system according to the present application is designed based on a five-piece lens. By limiting the system to satisfy the conditional formulas 2.40 < L / ∑CT < 2.75 and 12° < Semi-FOV < 25°, the axial size of the lens is reduced, the system meets the requirements of being thin and light, and by reasonably distributing the surface shapes and optical powers of each lens, the molding risks of the first to fifth lenses are reduced, the assembly stability of the optical system is increased, the risk of mutual collision between each lens is reduced, and at the same time, the low-order aberrations generated by the system can be better balanced, so that the system has good imaging quality. When (d4s - d2s) / f2 = -0.45 and (d4s - d2s) / f4 = -0.60 are satisfied among the inner diameter d4s of the object side surface of the fourth spacer element, the inner diameter d2s of the object side surface of the second spacer element, and the effective focal lengths f2 and f4 of the second lens and the fourth lens, the stray light situation and the optical path diagram of the optical imaging system are respectively as Fig. 20 , Fig.21As shown; when d4s, d2s, f2 and f4 satisfy the conditional formula (d4s-d2s) / f2=-0.09 and (d4s-d2s) / f4=-0.10, the stray light situation and the optical path diagram of the optical imaging system are respectively as shown Fig. 22 , Fig.23 As shown; when d4s, d2s, f2 and f4 satisfy the conditional formula (d4s-d2s) / f2=0.08 and (d4s-d2s) / f4=0.04, the stray light situation and the optical path diagram of the optical imaging system are respectively as shown Fig.24 , Fig.25 As shown; when d4s, d2s, f2 and f4 satisfy the conditional formula (d4s-d2s) / f2=0.29 and (d4s-d2s) / f4=0.23, the stray light situation and the optical path diagram of the optical imaging system are respectively as shown Fig.26 , Fig. 27 Compare Fig. 20 , Fig.21 , Fig. 22 , Fig.23 , Fig.24 , Fig.25 , Fig.26 and Fig. 27 It can be seen that the optical imaging system according to the present application can effectively reduce the generation of system stray light by controlling d4s, d2s, f2 and f4 to satisfy the conditions -0.24<(d4s-d2s) / f2<0.15 and -0.22<(d4s-d2s) / f4<0.10.

[0056] In an exemplary embodiment, the plurality of spacer elements of the optical imaging system may further include: a second auxiliary spacer element located at the image side of the second spacer element and at least partially in contact with the image side surface of the second spacer element.

[0057] In an exemplary embodiment, the plurality of spacer elements of the optical imaging system may further include: a third auxiliary spacer element located at the image side of the third spacer element and at least partially in contact with the image side surface of the third spacer element.

[0058] In an exemplary embodiment, the plurality of spacer elements of the optical imaging system may further include: a third auxiliary spacer element located on the image side of the third auxiliary spacer element and at least partially in contact with the image side surface of the third auxiliary spacer element.

[0059] In an exemplary embodiment, the plurality of spacer elements of the optical imaging system may further include: a fourth auxiliary spacer element located at the image side of the fourth spacer element and at least partially in contact with the image side surface of the fourth spacer element.

[0060] In an exemplary embodiment, the plurality of spacer elements of the optical imaging system may further include: a fourth auxiliary spacer element, located on the image side of the fourth auxiliary spacer element and at least partially in contact with the image side surface of the fourth auxiliary spacer element.

[0061] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expressions 2.18 < D3s / DT32 < 3.72 and 2.15 < D4s / DT42 < 2.75, where D3s is the outer diameter of the object side surface of the third spacer element, DT32 is the maximum effective radius of the image side surface of the third lens, D4s is the outer diameter of the object side surface of the fourth spacer element, and DT42 is the maximum effective radius of the image side surface of the fourth lens. By controlling the outer diameter of the object side surface of the third spacer element and the maximum effective radius of the image side surface of the third lens to satisfy 2.18 < D3s / DT32 < 3.72, and controlling the outer diameter of the object side surface of the fourth spacer element and the maximum effective radius of the image side surface of the fourth lens to satisfy 2.15 < D4s / DT42 < 2.75, it is beneficial to ensure the assembly stability of the third lens and the fourth lens. Meeting the above conditions can reasonably control the assembly step difference between the third lens and the fourth lens. The smaller the assembly step difference, the better the assembly stability of the lens.

[0062] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 7.34 < R2 / EP12×N1 < 13.45, where R2 is the radius of curvature of the image side surface of the second lens, EP12 is the distance between the first spacer element and the second spacer element on the optical axis (i.e., the distance between the image side surface of the first spacer element and the object side surface of the second spacer element on the optical axis), and N1 is the refractive index of the first lens. By reasonably controlling this conditional expression, it is beneficial for light to be better transmitted after entering the lens; at the same time, controlling the radius of curvature of the image side surface of the second lens is beneficial to reducing the forming difficulty of the second lens.

[0063] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 1.23 < (D2m - d3s) / (CT2 + CT3) < 1.70, where D2m is the outer diameter of the image side surface of the second spacer element, d3s is the inner diameter of the object side surface of the third spacer element, CT2 is the central thickness of the second lens on the optical axis, and CT3 is the central thickness of the third lens on the optical axis. By controlling the system to meet the above conditions, controlling the difference between the outer diameter of the image side surface of the second spacer element and the inner diameter of the object side surface of the third spacer element is beneficial to improving the stray light between the second and third lenses; by controlling the central thicknesses of the second and third lenses, it is beneficial to the forming of the lenses and beneficial to improving the process stability.

[0064] In an exemplary embodiment, the optical imaging system of the present application can satisfy the conditional formula 0.38 < T34 / (L - ∑AT) < 0.80, where T34 is the air gap on the optical axis between the third lens and the fourth lens, L is the maximum height of the lens barrel along the optical axis or in a direction parallel to the optical axis, and ∑AT is the sum of the air gaps on the optical axis between any two adjacent lenses with optical power in the optical imaging system. By reasonably controlling this conditional formula, it is beneficial to ensure the performance and assembly stability of the optical imaging lens and ensure the production yield of the lens.

[0065] In an exemplary embodiment, the optical imaging system of the present application can satisfy the conditional formula 4.78 < (D0s - d0s) / (R2 - R1) < 20.60, where D0s is the outer diameter of the object-side end face of the lens barrel (i.e., the end face or surface of the lens barrel closest to the object side), d0s is the inner diameter of the object-side end face of the lens barrel, R2 is the curvature radius of the image-side surface of the first lens, and R1 is the curvature radius of the object-side surface of the first lens. By reasonably controlling this conditional formula, it helps to ensure the size of the lens barrel structure part at the position of the first lens, reasonably control the wall thickness of the lens barrel, enable it to withstand greater pressure during lens assembly, make the assembly stability at the front end position of the optical imaging lens better, and improve the reliability of the optical imaging lens under different conditions.

[0066] In an exemplary embodiment, the optical imaging system of the present application can satisfy the conditional formula 0.60 < (D3m - d3m) / R6 < 0.96, where D3m is the outer diameter of the image-side surface of the third spacer element, d3m is the inner diameter of the image-side surface of the third spacer element, and R6 is the curvature radius of the image-side surface of the third lens. By controlling the system to meet the above conditions and reasonably controlling the difference between the outer diameter and the inner diameter of the image-side surface of the third spacer element, it is beneficial to the assembly stability between the third and fourth lenses, ensure that the air gap at the third spacer element changes little during the drop of lens reliability, and improve reliability. At the same time, by controlling the curvature radius of the third lens, it is beneficial to optimize the shape of the third lens and improve the processability of the third lens processing.

[0067] In an exemplary embodiment, the optical imaging system of the present application can satisfy the conditional formula 0.59 < (D4m - DT51) / d4m < 0.95, where D4m is the outer diameter of the image-side surface of the fourth spacer element, DT51 is the maximum effective radius of the object-side surface of the fifth lens, and d4m is the inner diameter of the image-side surface of the fourth spacer element. By reasonably controlling this conditional formula, it is beneficial to control the interception of the outgoing light rays passing through the fourth lens by the fourth spacer element, improve stray light under the condition of ensuring the lens illuminance, and improve the imaging quality of the lens.

[0068] In an exemplary embodiment, the optical imaging system of the present application can satisfy the conditional formula 0.13 < EP34 / (R6 + |R7|) < 0.37, where EP34 is the distance between the third spacer element and the fourth spacer element on the optical axis, R6 is the radius of curvature of the image side of the third lens, and R7 is the radius of curvature of the object side of the fourth lens. By controlling the system to satisfy this conditional formula, it is beneficial to improve the shapes of the third and fourth lenses and enhance the lens forming process. At the same time, by reasonably distributing the optical power between the third and fourth lenses, it is beneficial to correct the axial chromatic aberration in the optical system.

[0069] In an exemplary embodiment, the optical imaging system of the present application can satisfy the conditional formulas 1.41 < D2s / R3 < 1.79 and 0.04 < D3s / R5 < 0.28, where D2s is the outer diameter of the object side of the second spacer element, R3 is the radius of curvature of the object side of the second lens, D3s is the outer diameter of the object side of the third spacer element, and R5 is the radius of curvature of the object side of the third lens. By reasonably controlling the system to satisfy the above conditions, it is beneficial to improve the field curvature consistency and lens shape of the system and reduce the sensitivity of the system to tolerances.

[0070] In an exemplary embodiment, the plurality of spacer elements of the optical imaging system of the present application further includes a third auxiliary spacer element, which is located on the image side of the third spacer element and at least partially contacts the image side of the third spacer element. And the optical imaging system can satisfy the conditional formula 0.17 < (D3bm - d3bm) / DT41 < 0.94, where D3bm is the outer diameter of the image side of the third auxiliary spacer element, d3bm is the inner diameter of the image side of the third auxiliary spacer element, and DT41 is the maximum effective radius of the object side of the fourth lens. By controlling the optical imaging system to satisfy the above conditions and reasonably controlling the ratio of the difference between the outer and inner diameters of the image side of the third auxiliary spacer element to the maximum effective radius of the object side of the fourth lens, it is beneficial to the bearing stability between the third and fourth lenses.

[0071] In an exemplary embodiment, the plurality of spacer elements of the optical imaging system of the present application further includes a third auxiliary spacer element, which is located on the image side of the third spacer element and at least partially contacts the image side of the third spacer element. And the optical imaging system can satisfy the conditional formula 10.80 mm < |f3| / CP3b × d3s < 15.59 mm, where f3 is the effective focal length of the third lens, CP3b is the maximum thickness of the third auxiliary spacer element along the optical axis direction, and d3s is the inner diameter of the object side of the third spacer element. By controlling the optical imaging system to satisfy the above conditions, it is beneficial to compensate for the spherical aberration between the third lens and the fourth lens and improve the overall aberration of the optical system.

[0072] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 0.00<∑CP4 / (T45+CT4+CT5)<0.66, wherein ∑CP4 is the sum of the maximum thicknesses of all spacer elements (including one or more spacer elements of the fourth spacer element) between the fourth lens and the fifth lens along the optical axis. For example, when only the fourth spacer element is included between the fourth lens and the fifth lens, ∑CP4 is equal to the maximum thickness of the fourth spacer element along the optical axis; when not only the fourth spacer element but also other spacer elements are included between the fourth lens and the fifth lens, for example, the fourth spacer element and the fourth auxiliary spacer element are included between the fourth lens and the fifth lens, then ∑CP4 is equal to the sum of the maximum thicknesses of the fourth spacer element and the fourth auxiliary spacer element along the optical axis; for another example, when the fourth spacer element, the fourth auxiliary spacer element and the fourth secondary auxiliary spacer element are included between the fourth lens and the fifth lens, then ∑CP4 is equal to the sum of the maximum thicknesses of the fourth spacer element, the fourth auxiliary spacer element and the fourth auxiliary spacer element along the optical axis. T45 is the air gap between the fourth lens and the fifth lens on the optical axis, CT4 is the center thickness of the fourth lens on the optical axis, and CT5 is the center thickness of the fifth lens on the optical axis. By reasonably controlling the range of this conditional expression, it is beneficial to the processing and molding requirements of the fourth and fifth lenses; at the same time, it helps to ensure the stability of the fourth and fifth lens assembly.

[0073] In an exemplary embodiment, the optical imaging system of the present application can satisfy the conditional expression 0.61<(D4s-d3s) / EP34<1.50, wherein D4s is the outer diameter of the object side of the fourth spacer element, d3s is the inner diameter of the object side of the third spacer element, and EP34 is the distance from the third spacer element to the fourth spacer element on the optical axis. By reasonably controlling the range of this conditional expression, the non-imaging light between the third and fourth lenses can be effectively intercepted, which helps to improve stray light and improve the imaging quality of the lens.

[0074] In an exemplary embodiment, the lens barrel may include an object side boss structure and an image side boss structure, which may protrude outward from the outer circumference of the lens barrel at the object side end and the image side end of the lens barrel, respectively, and the object side boss structure and the image side boss structure and the outer circumference of the lens barrel located therebetween may form a groove, which may be used to assemble the module connector. Figure 2 , where the reference numeral STR1 indicates, for example, the object side boss structure of the lens barrel, STR2 indicates, for example, the image side boss structure of the lens barrel, and SUR1 indicates, for example, the outer peripheral surface of the lens barrel located between the object side boss structure and the image side boss structure; the object side boss structure STR1 of the lens barrel, the image side boss structure STR2 and the outer peripheral surface SUR1 therebetween can form a structure as shown in FIG. Figure 2The groove structure shown in the figure, the module connector (not shown in the figure) can be assembled in the groove.

[0075] In an exemplary embodiment, the optical imaging system of the present application may include at least one aperture. The aperture may constrain the optical path and control the light intensity. The aperture may be set at an appropriate position of the optical imaging system, for example, the aperture may be set between the object side and the first lens.

[0076] In an exemplary embodiment, optionally, the optical 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.

[0077] In an exemplary embodiment, the mirror surfaces of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens may include one or more aspherical mirror surfaces, which have better curvature radius characteristics and have the advantages of improving distortion aberration and improving astigmatism aberration. The use of aspherical mirror surfaces can eliminate aberrations that occur during imaging as much as possible, thereby improving imaging quality.

[0078] The optical imaging system according to an embodiment of the present application includes a lens barrel, a five-piece lens group, and a plurality of spacer elements accommodated in the lens barrel. The first lens to the fifth lens are arranged in sequence from the object side to the image side along the optical axis. Among them, the first lens has a positive optical power, the second lens has a positive optical power, the third lens has a negative optical power, the fourth lens has a positive optical power, and the fifth lens has a negative optical power; the plurality of spacer elements at least include a first, a second, a third, and a fourth spacer element respectively located on the image side of the first, second, third, and fourth lenses and at least partially in contact with the image side surfaces of the first, second, third, and fourth lenses; by controlling that the maximum height L of the lens barrel and the sum ∑CT of the central thicknesses of the first lens to the fifth lens on the optical axis satisfy the conditional formula 2.40 < L / ∑CT < 2.75, and controlling that half of the maximum field of view Semi-FOV of the optical imaging system satisfies the conditional formula 12° < Semi-FOV < 25°, it is beneficial to reduce the axial size of the lens, enable the system to meet the requirements of being thin and light, reasonably distribute the surface shapes and optical powers of each lens, which is beneficial to reducing the molding risk of the first to fifth lenses, increasing the assembly stability of the optical system, reducing the risk of mutual collision between each lens, and at the same time is also beneficial to balancing the low-order aberrations generated by the system, so that the system has good imaging quality; at the same time, in order to effectively avoid the generation of stray light in the system, further control the system to satisfy the conditional formulas -0.24 < (d4s - d2s) / f2 < 0.15, -0.22 < (d4s - d2s) / f4 < 0.10. By reasonably controlling the inner diameter d2s of the object side surface of the second spacer element and the inner diameter d4s of the object side surface of the fourth spacer element, non-imaging light rays in the system can be intercepted. At the same time, by reasonably controlling the effective focal lengths f2 and f4 of the second lens and the fourth lens, the propagation path of light rays in the lens group can be changed, and the generation of stray light can be reduced.

[0079] On the other hand, the optical imaging system according to an embodiment of the present application includes a lens barrel, a five-piece lens group, and a plurality of spacer elements accommodated in the lens barrel. The first lens to the fifth lens are arranged in sequence from the object side to the image side along the optical axis. Among them, the first lens has a positive optical power, the second lens has a positive optical power, the third lens has a negative optical power, the fourth lens has a positive optical power, and the fifth lens has a negative optical power; the plurality of spacer elements at least include a first, a second, a third, and a fourth spacer element respectively located on the image side of the first, second, third, and fourth lenses and at least partially in contact with the image side surfaces of the first, second, third, and fourth lenses. With such a setting of the optical imaging system, by simultaneously controlling the outer diameter D2m of the image side surface of the second spacer element, the inner diameter d3s of the object side surface of the third spacer element, the central thickness CT2 of the second lens on the optical axis, and the central thickness CT3 of the third lens on the optical axis to satisfy the conditional formula 1.23 < (D2m - d3s) / (CT2 + CT3) < 1.70, it can be beneficial to improve the stray light between the second and third lenses; at the same time, it is beneficial to the molding of the second and third lens lenses and is beneficial to improving the process stability.

[0080] In another aspect, an optical imaging system according to an embodiment of the present application includes a lens barrel and a five-piece lens group and a plurality of spacer elements accommodated in the lens barrel. The first lens to the fifth lens are sequentially arranged along the optical axis from the object side to the image side. Among them, the first lens has a positive optical power, the second lens has a positive optical power, the third lens has a negative optical power, the fourth lens has a positive optical power, and the fifth lens has a negative optical power; the plurality of spacer elements at least include first, second, third, and fourth spacer elements respectively located on the image sides of the first, second, third, and fourth lenses and at least partially in contact with the image side surfaces of the first, second, third, and fourth lenses. By such an arrangement of the optical imaging system, while controlling the distance EP34 between the third spacer element and the fourth spacer element on the optical axis and the curvature radius R6 of the image side surface of the third lens and the curvature radius R7 of the object side surface of the fourth lens to satisfy the conditional expression 0.13 < EP34 / (R6 + |R7|) < 0.37, it is beneficial to improve the shapes of the third and fourth lenses and enhance the lens forming process; at the same time, the optical power between the third and fourth lenses can be reasonably distributed, which is beneficial to correcting the axial chromatic aberration in the optical system.

[0081] In yet another aspect, an optical imaging system according to an embodiment of the present application includes a lens barrel and a five-piece lens group and a plurality of spacer elements accommodated in the lens barrel. The first lens to the fifth lens are sequentially arranged along the optical axis from the object side to the image side. Among them, the first lens has a positive optical power, the second lens has a positive optical power, the third lens has a negative optical power, the fourth lens has a positive optical power, and the fifth lens has a negative optical power; the plurality of spacer elements at least include first, second, third, and fourth spacer elements respectively located on the image sides of the first, second, third, and fourth lenses and at least partially in contact with the image side surfaces of the first, second, third, and fourth lenses. By such an arrangement of the optical imaging system, while controlling the sum ∑CP4 of the maximum thicknesses of all spacer elements located between the fourth lens and the fifth lens in the optical axis direction, 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 to satisfy the conditional expression 0.00 < ∑CP4 / (T45 + CT4 + CT5) < 0.66, it is beneficial to the processing and forming requirements of the fourth and fifth lenses; at the same time, it helps to ensure the standing stability of the fourth and fifth lens groups.

[0082] However, it should be understood by those skilled in the art that, without departing from the technical solution claimed in the present application, the number of lenses constituting the optical imaging system may be changed, and the number of spacing elements may also be changed to obtain the various results and advantages described in this specification, and the present application does not specifically limit this. For example, although five lenses are described as an example in the embodiment, the optical imaging system is not limited to including five lenses. If necessary, the optical imaging system may also include other numbers of lenses. For another example, as needed, the optical imaging system may also include other numbers of spacing elements different from those described in the above embodiment.

[0083] The present application also provides a camera module, which includes an optical imaging system provided according to an embodiment of the present application, and also includes a module connector and a module driver. The module connector can, for example, be assembled to the lens barrel of the optical imaging system, and the module driver can, for example, drive the optical imaging system through the module connector.

[0084] In an exemplary embodiment, the module connector can be assembled in a groove formed by the object side boss structure, the image side boss structure and the outer peripheral surface therebetween. For example, the module connector can be fixed in the groove of the lens barrel by glue point bonding.

[0085] In an exemplary embodiment, the module driver may include a motor, for example, which may drive the optical imaging system to change position or orientation within a certain range, so that the optical imaging system can move and / or rotate, etc. For example, the optical imaging system may be driven to slide in the module to achieve focusing.

[0086] In an exemplary embodiment, the camera module may also include one or more other optical imaging systems.

[0087] In an exemplary embodiment, the module connector may be a magnet connector, and the module driver may electromagnetically drive the optical imaging system through the magnet connector. For example, the module driver may drive the optical imaging system to achieve sliding focus in the module.

[0088] In an exemplary embodiment, the module connector may be a square magnet, which may be fixed in the groove of the lens barrel by adhesive bonding. The module driver may be a motor, which may directly electromagnetically drive the optical imaging system by connecting to the square magnet of the lens barrel. For example, the drive system may realize sliding focus in the module.

[0089] Specific embodiments of the optical imaging system applicable to the above-mentioned embodiments are further described below with reference to the accompanying drawings.

[0090] Example 1

[0091] The following reference Figure 2An optical imaging system according to Example 1 of the present application is described.

[0092] like Figure 2 As shown, in this embodiment, the optical imaging system includes a lens barrel and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4 and a fifth lens E5 accommodated in the lens barrel and arranged in sequence from the object side to the image side along the optical axis.

[0093] In this embodiment, the optical imaging system further comprises a plurality of spacing elements: a first spacing element P1, located on the image side of the first lens E1 and in at least partial contact with the image side surface of the first lens E1; a second spacing element P2, located on the image side of the second lens E2 and in at least partial contact with the image side surface of the second lens E2; a third spacing element P3, located on the image side of the third lens E3 and in at least partial contact with the image side surface of the third lens E3; a third auxiliary spacing element P3b, located on the image side of the third spacing element P3 and in at least partial contact with the image side surface of the third spacing element P3; a third auxiliary spacing element P3c, located on the image side of the third auxiliary spacing element P3b and in at least partial contact with the image side surface of the third auxiliary spacing element P3b; a fourth spacing element P4, located on the image side of the fourth lens E4 and in at least partial contact with the image side surface of the fourth lens E4; and a fourth auxiliary spacing element P4b, located on the image side of the fourth spacing element P4 and in at least partial contact with the image side surface of the fourth spacing element P4.

[0094] In this embodiment, the first lens E1 has positive power, its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has positive power, its object side surface S3 is convex, and its image side surface S4 is convex. The third lens E3 has negative power, its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive power, its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has negative power, its object side surface S9 is convex, and its image side surface S10 is concave.

[0095] Table 1 shows basic parameters of the optical imaging system of Example 1, wherein the units of the radius of curvature, thickness / distance and effective radius 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 fifth lens E5 are both aspherical surfaces, and the surface shape x of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0099]

[0100] Wherein, x is the distance vector height from the vertex of the aspherical surface when the aspherical surface is at a height of h along the optical axis; c is the paraxial curvature of the aspherical 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 aspherical surface. The following 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, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A71, A72, A73, A74, A75 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 2.0658E-03 -5.0214E-03 3.5227E-03 -1.5853E-03 6.4346E-04 -3.3183E-04 1.7648E-04 S2 8.1219E-03 -3.6124E-02 3.4888E-02 -1.9105E-02 6.0027E-03 -2.5985E-04 -7.5083E-04 S3 4.6452E-03 -3.1637E-02 3.1100E-02 -1.7624E-02 6.5327E-03 -1.3259E-03 -6.1228E-05 S4 4.8199E-03 -2.6770E-02 5.4280E-02 -6.1303E-02 4.7293E-02 -2.6659E-02 1.1121E-02 S5 -1.2461E-02 -2.1618E-02 6.8505E-02 -9.4398E-02 8.6832E-02 -5.9105E-02 3.0424E-02 S6 -1.8482E-02 -4.1191E-03 3.9906E-02 -9.0348E-02 1.3940E-01 -1.5817E-01 1.3130E-01 S7 4.1954E-03 4.3954E-02 -1.7832E-01 4.0469E-01 -6.1811E-01 6.6352E-01 -5.1266E-01 S8 7.7932E-02 -7.4449E-02 1.0301E-01 -1.5553E-01 1.9478E-01 -1.8323E-01 1.2640E-01 S9 -6.4331E-02 1.8645E-02 -3.6426E-02 8.3289E-02 -1.1060E-01 9.4358E-02 -5.5237E-02 S10 -1.5620E-01 9.0482E-02 -6.8761E-02 6.1649E-02 -5.2255E-02 3.5026E-02 -1.7410E-02

[0102] Table 2-1

[0103] Face number A18 A20 A22 A24 A26 A28 A30 S1 -7.0818E-05 1.9468E-05 -3.6006E-06 4.4110E-07 -3.4376E-08 1.5457E-09 -3.0568E-11 S2 3.9914E-04 -1.1202E-04 2.0031E-05 -2.3626E-06 1.7941E-07 -7.9954E-09 1.5951E-10 S3 1.2890E-04 -4.0498E-05 6.9396E-06 -7.3101E-07 4.7653E-08 -1.8054E-09 3.1582E-11 S4 -3.4195E-03 7.6768E-04 -1.2378E-04 1.3923E-05 -1.0349E-06 4.5597E-08 -8.9971E-10 S5 -1.1778E-02 3.3847E-03 -7.0873E-04 1.0491E-04 -1.0398E-05 6.1890E-07 -1.6716E-08 S6 -7.9047E-02 3.4274E-02 -1.0563E-02 2.2515E-03 -3.1462E-04 2.5834E-05 -9.4019E-07 S7 2.8853E-01 -1.1843E-01 3.5078E-02 -7.3020E-03 1.0135E-03 -8.4207E-05 3.1677E-06 S8 -6.3615E-02 2.3232E-02 -6.0747E-03 1.1061E-03 -1.3296E-04 9.4685E-06 -3.0200E-07 S9 2.2895E-02 -6.7913E-03 1.4336E-03 -2.1035E-04 2.0388E-05 -1.1734E-06 3.0364E-08 S10 6.3149E-03 -1.6597E-03 3.1214E-04 -4.0908E-05 3.5466E-06 -1.8276E-07 4.2377E-09

[0104] Table 2-2

[0105] Example 2

[0106] The following reference Figure 3 Describe the optical imaging system according to Example 2 of the present application.

[0107] like Figure 3 As shown, in this embodiment, the optical imaging system includes a lens barrel and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4 and a fifth lens E5 accommodated in the lens barrel and arranged in sequence from the object side to the image side along the optical axis. The optical imaging system further comprises a plurality of spacing elements: a first spacing element P1, located on the image side of the first lens E1 and in at least partial contact with the image side surface of the first lens E1; a second spacing element P2, located on the image side of the second lens E2 and in at least partial contact with the image side surface of the second lens E2; a third spacing element P3, located on the image side of the third lens E3 and in at least partial contact with the image side surface of the third lens E3; a third auxiliary spacing element P3b, located on the image side of the third spacing element P3 and in at least partial contact with the image side surface of the third spacing element P3; a third auxiliary spacing element P3c, located on the image side of the third auxiliary spacing element P3b and in at least partial contact with the image side surface of the third auxiliary spacing element P3b; a fourth spacing element P4, located on the image side of the fourth lens E4 and in at least partial contact with the image side surface of the fourth lens E4; and a fourth auxiliary spacing element P4b, located on the image side of the fourth spacing element P4 and in at least partial contact with the image side surface of the fourth spacing element P4.

[0108] The structure of the optical imaging system of this embodiment is the same as that of the optical imaging system of Embodiment 1, that is, the basic parameter table of the optical imaging system of this embodiment is the same as Table 1, and the high-order coefficient table of the aspheric mirror is the same as Table 2-1 and Table 2-2.

[0109] The difference between this embodiment and embodiment 1 lies in the different parameters such as the structural dimensions of the lens barrel and some of the spacing elements, the spacing of some of the spacing elements along the optical axis, and the maximum effective radius of the object side or image side of some of the lenses. The values ​​of multiple parameters of the lens barrel and the spacing elements included in the optical imaging system of this embodiment and embodiment 1 are shown in Table 7 below, and the multiple parameters specifically include:

[0110] The inner diameter d2s of the object side surface of the second spacing element P2, the outer diameter D2s of the object side surface of the second spacing element P2, the outer diameter D2m of the image side surface of the second spacing element P2, the inner diameter d3s of the object side surface of the third spacing element P3, the inner diameter d3m of the image side surface of the third spacing element P3, the outer diameter D3s of the object side surface of the third spacing element P3, the outer diameter D3m of the image side surface of the third spacing element P3, the inner diameter d4s of the object side surface of the fourth spacing element P4, the inner diameter d4m of the image side surface of the fourth spacing element P4, the outer diameter D4s of the object side surface of the fourth spacing element P4, the outer diameter D4m of the image side surface of the fourth spacing element P4, the inner diameter d0s of the object side end surface of the lens barrel, the outer diameter D0s of the object side end surface of the lens barrel, the distance from the image side surface of the first spacing element P1 to the object side surface of the second spacing element P2 on the optical axis The invention relates to a lens barrel having a maximum height L, a distance EP12 from the image side surface of the third spacer element P3 to the object side surface of the fourth spacer element P4 on the optical axis, a maximum effective radius DT32 of the image side surface of the third lens E3, a maximum effective radius DT41 of the object side surface of the fourth lens E4, a maximum effective radius DT42 of the image side surface of the fourth lens E4, and a maximum effective radius DT51 of the object side surface of the fifth lens E5.

[0111] In addition, Table 7 also shows the values ​​of parameters ∑AT and ∑CT in various embodiments, wherein ∑AT is the sum of the air gaps between any two adjacent lenses having optical power in the optical imaging system on the optical axis, and ∑CT is the sum of the center thickness of each lens from the first lens to the fifth lens on the optical axis. The units of the values ​​of the parameters shown in Table 7 are all millimeters (mm), and the schematic diagram of some parameters in the structural diagram of the optical imaging system can be found in the attached Figure 1 .

[0112] Example 3

[0113] The following reference Figure 4 Describe the optical lens according to Example 3 of the present application.

[0114] like Figure 4 As shown, in this embodiment, the optical imaging system includes a lens barrel and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4 and a fifth lens E5 accommodated in the lens barrel and arranged in sequence from the object side to the image side along the optical axis. The optical imaging system further comprises a plurality of spacer elements: a first spacer element P1, located on the image side of the first lens E1 and in at least partial contact with the image side surface of the first lens E1; a second spacer element P2, located on the image side of the second lens E2 and in at least partial contact with the image side surface of the second lens E2; a second auxiliary spacer element P2b, located on the image side of the second spacer element P2 and in at least partial contact with the image side surface of the second spacer element P2; a third spacer element P3, located on the image side of the third lens E3 and in at least partial contact with the image side surface of the third lens E3; a third auxiliary spacer element P3b, located on the image side of the third spacer element P3 and in at least partial contact with the image side surface of the third spacer element P3; a fourth spacer element P4, located on the image side of the fourth lens E4 and in at least partial contact with the image side surface of the fourth lens E4; and a fourth auxiliary spacer element P4b, located on the image side of the fourth spacer element P4 and in at least partial contact with the image side surface of the fourth spacer element P4.

[0115] The structure of the optical imaging system of this embodiment is also the same as that of the optical imaging system of Embodiment 1, that is, the basic parameter table of the optical imaging system of this embodiment is the same as Table 1, and the high-order coefficient table of the aspheric mirror surface is the same as Table 2-1 and Table 2-2.

[0116] The difference between this embodiment and embodiment 1 is also that the structural dimensions of the lens barrel and some of the spacing elements, the spacing of some of the spacing elements along the optical axis, and the maximum effective radius of the object side or image side of some of the lenses are different. The values ​​of multiple parameters of the lens barrel and the spacing elements included in the optical imaging system of this embodiment and embodiment 1 are also shown in Table 7 below, and the specific description of the multiple parameters is the same as the relevant description in the above embodiment 2, which will not be repeated here.

[0117] Figure 5 Astigmatism curves of the optical imaging systems of Example 1, Example 2 and Example 3 are shown, which represent meridional image curvature and sagittal image curvature. Figure 6 Distortion curves of the optical imaging systems of Embodiment 1, Embodiment 2 and Embodiment 3 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 7The axial chromatic aberration curves of the optical imaging systems of Embodiment 1, Embodiment 2 and Embodiment 3 are shown, which indicate the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Figures 5 to 7 It can be seen that the optical imaging systems provided in Embodiment 1, Embodiment 2 and Embodiment 3 can achieve good imaging quality.

[0118] Example 4

[0119] The following reference Figure 8 Describe the optical imaging system according to Example 4 of the present application.

[0120] like Figure 8 As shown, in this embodiment, the optical imaging system includes a lens barrel and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4 and a fifth lens E5 accommodated in the lens barrel and arranged in sequence from the object side to the image side along the optical axis.

[0121] In this embodiment, the optical imaging system further comprises a plurality of spacing elements: a first spacing element P1, located on the image side of the first lens E1 and in at least partial contact with the image side surface of the first lens E1; a second spacing element P2, located on the image side of the second lens E2 and in at least partial contact with the image side surface of the second lens E2; a third spacing element P3, located on the image side of the third lens E3 and in at least partial contact with the image side surface of the third lens E3; a third auxiliary spacing element P3b, located on the image side of the third spacing element P3 and in at least partial contact with the image side surface of the third spacing element P3; a third auxiliary spacing element P3c, located on the image side of the third auxiliary spacing element P3b and in at least partial contact with the image side surface of the third auxiliary spacing element P3b; a fourth spacing element P4, located on the image side of the fourth lens E4 and in at least partial contact with the image side surface of the fourth lens E4; and a fourth auxiliary spacing element P4b, located on the image side of the fourth spacing element P4 and in at least partial contact with the image side surface of the fourth spacing element P4.

[0122] In this embodiment, the first lens E1 has positive power, its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has positive power, its object side surface S3 is convex, and its image side surface S4 is convex. The third lens E3 has negative power, its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive power, its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has negative power, its object side surface S9 is convex, and its image side surface S10 is concave.

[0123] Table 3 shows the basic parameters of the optical imaging system of Example 4, wherein the units of the radius of curvature, thickness / distance and effective radius are all millimeters (mm).

[0124]

[0125] Table 3

[0126] In this embodiment, the object side surface and the image side surface of any one of the first lens E1 to the fifth lens E5 are aspherical surfaces, and the surface shape of each aspherical surface can be defined by the formula (1) given in the above embodiment 1. Tables 4-1 and 4-2 show 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, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0127] Face number A4 A6 A8 A10 A12 A14 A16 S1 -5.4732E-04 9.2538E-04 -1.0285E-03 -1.0871E-03 2.5525E-03 -2.1191E-03 1.0354E-03 S2 -8.1653E-03 2.6924E-02 -6.0590E-02 5.3870E-02 -2.2286E-02 2.3341E-03 2.0268E-03 S3 -9.5646E-03 2.8569E-02 -6.5927E-02 6.2749E-02 -3.1639E-02 9.0969E-03 -1.4168E-03 S4 5.0518E-03 2.0252E-02 -1.1815E-01 2.1763E-01 -2.1931E-01 1.4147E-01 -6.2690E-02 S5 -3.5725E-03 3.3614E-02 -1.5593E-01 2.8789E-01 -2.9716E-01 1.9561E-01 -8.7312E-02 S6 -4.5857E-03 -5.8489E-03 3.5021E-02 -1.2758E-01 2.7505E-01 -3.6941E-01 3.2905E-01 S7 3.8697E-03 2.0459E-02 -6.7876E-02 1.4140E-01 -2.0650E-01 2.1523E-01 -1.6265E-01 S8 -2.2985E-02 4.0780E-02 -5.5020E-02 5.9501E-02 -4.8950E-02 2.8931E-02 -1.1730E-02 S9 -1.2065E-01 8.6278E-02 -1.1121E-01 1.4859E-01 -1.5305E-01 1.1464E-01 -6.2338E-02 S10 -1.1645E-01 6.0894E-02 -5.3029E-02 5.3062E-02 -4.3928E-02 2.6957E-02 -1.2037E-02

[0128] Table 4-1

[0129] Face number A18 A20 A22 A24 A26 A28 A30 S1 -3.3570E-04 7.5333E-05 -1.1794E-05 1.2661E-06 -8.8887E-08 3.6762E-09 -6.7909E-11 S2 -1.1589E-03 3.1806E-04 -5.4324E-05 6.0378E-06 -4.2630E-07 1.7400E-08 -3.1267E-10 S3 8.6955E-05 -2.3724E-06 3.7325E-06 -1.1959E-06 1.6328E-07 -1.0893E-08 2.9329E-10 S4 1.9735E-02 -4.4666E-03 7.2321E-04 -8.1825E-05 6.1467E-06 -2.7547E-07 5.5726E-09 S5 2.7147E-02 -5.9025E-03 8.8159E-04 -8.6286E-05 4.9867E-06 -1.2904E-07 0.0000E+00 S6 -2.0244E-01 8.7719E-02 -2.6799E-02 5.6642E-03 -7.8961E-04 6.5394E-05 -2.4389E-06 S7 8.9877E-02 -3.6291E-02 1.0584E-02 -2.1696E-03 2.9650E-04 -2.4245E-05 8.9728E-07 S8 2.9659E-03 -3.0373E-04 -7.2344E-05 3.4275E-05 -6.1112E-06 5.5010E-07 -2.0629E-08 S9 2.4709E-02 -7.1255E-03 1.4773E-03 -2.1432E-04 2.0638E-05 -1.1843E-06 3.0640E-08 S10 3.9091E-03 -9.2096E-04 1.5556E-04 -1.8342E-05 1.4326E-06 -6.6576E-08 1.3929E-09

[0130] Table 4-2

[0131] Example 5

[0132] The following reference Fig. 9 Describe the optical imaging system according to Example 5 of the present application.

[0133] like Fig. 9As shown, in this embodiment, the optical imaging system includes a lens barrel and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4 and a fifth lens E5 which are accommodated in the lens barrel and arranged in sequence from the object side to the image side along the optical axis. The optical imaging system also includes a plurality of spacing elements: a first spacing element P1, which is located on the image side of the first lens E1 and is in at least partial contact with the image side surface of the first lens E1; a second spacing element P2, which is located on the image side of the second lens E2 and is in at least partial contact with the image side surface of the second lens E2; a third spacing element P3, which is located on the image side of the third lens E3 and is in at least partial contact with the image side surface of the third lens E3; a third auxiliary spacing element P3b, which is located on the image side of the third spacing element P3 and is in at least partial contact with the image side surface of the third spacing element P3; and a third auxiliary spacing element P3b, which is located on the image side of the third spacing element P3 and is in at least partial contact with the image side surface of the third spacing element P3. The element P3c is located on the image side of the third auxiliary spacing element P3b and is at least partially in contact with the image side surface of the third auxiliary spacing element P3b; the fourth spacing element P4 is located on the image side of the fourth lens E4 and is at least partially in contact with the image side surface of the fourth lens E4; the fourth auxiliary spacing element P4b is located on the image side of the fourth spacing element P4 and is at least partially in contact with the image side surface of the fourth spacing element P4; and the fourth auxiliary spacing element P4c is located on the image side of the fourth auxiliary spacing element P4b and is at least partially in contact with the image side surface of the fourth auxiliary spacing element P4b.

[0134] The structure of the optical imaging system of this embodiment is the same as that of the optical imaging system of Example 4, that is, the basic parameter table of the optical imaging system of this embodiment is the same as Table 3, and the high-order coefficient table of the aspheric mirror is the same as Table 4-1 and Table 4-2.

[0135] The difference between this embodiment and embodiment 4 lies in the different parameters such as the structural dimensions of the lens barrel and some of the spacing elements, the spacing of some of the spacing elements along the optical axis direction, and the maximum effective radius of the object side or image side of some of the lenses. The values ​​of multiple parameters of the lens barrel and the spacing elements included in the optical imaging system of this embodiment and embodiment 4 are shown in Table 7 below, and the specific description of the multiple parameters is the same as that in the above embodiment 2, and will not be repeated here.

[0136] Example 6

[0137] The following reference Fig.10 Describe the optical lens according to Example 6 of the present application.

[0138] like Fig.10As shown, in this embodiment, the optical imaging system includes a lens barrel and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4 and a fifth lens E5 accommodated in the lens barrel and arranged in sequence from the object side to the image side along the optical axis. The optical imaging system further comprises a plurality of spacer elements: a first spacer element P1, located on the image side of the first lens E1 and in at least partial contact with the image side surface of the first lens E1; a second spacer element P2, located on the image side of the second lens E2 and in at least partial contact with the image side surface of the second lens E2; a second auxiliary spacer element P2b, located on the image side of the second spacer element P2 and in at least partial contact with the image side surface of the second spacer element P2; a third spacer element P3, located on the image side of the third lens E3 and in at least partial contact with the image side surface of the third lens E3; a third auxiliary spacer element P3b, located on the image side of the third spacer element P3 and in at least partial contact with the image side surface of the third spacer element P3; a fourth spacer element P4, located on the image side of the fourth lens E4 and in at least partial contact with the image side surface of the fourth lens E4; and a fourth auxiliary spacer element P4b, located on the image side of the fourth spacer element P4 and in at least partial contact with the image side surface of the fourth spacer element P4.

[0139] The structure of the optical imaging system of this embodiment is also the same as that of the optical imaging system of Embodiment 4, that is, the basic parameter table of the optical imaging system of this embodiment is the same as Table 3, and the high-order coefficient table of the aspheric mirror is the same as Table 4-1 and Table 4-2.

[0140] The difference between this embodiment and embodiment 4 is also that the structural dimensions of the lens barrel and some of the spacing elements, the spacing of some of the spacing elements along the optical axis, and the maximum effective radius of the object side or image side of some of the lenses are different. The values ​​of multiple parameters of the lens barrel and the spacing elements included in the optical imaging system of this embodiment and embodiment 4 are also shown in Table 7 below, and the specific description of the multiple parameters is also the same as the relevant description in the above embodiment 2, which will not be repeated here.

[0141] Fig.11 Astigmatism curves of the optical imaging systems of Example 4, Example 5 and Example 6 are shown, which represent meridional image plane curvature and sagittal image plane curvature. Fig.12 The distortion curves of the optical imaging systems of Embodiment 4, Embodiment 5 and Embodiment 6 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Fig.13 The axial chromatic aberration curves of the optical imaging systems of Embodiment 4, Embodiment 5 and Embodiment 6 are shown, which indicate the deviation of the convergent focus of light of different wavelengths after passing through the lens. Figures 11 to 13 It can be seen that the optical imaging systems provided in Embodiment 4, Embodiment 5 and Embodiment 6 can achieve good imaging quality.

[0142] Example 7

[0143] The following reference Fig.14 Describe the optical imaging system according to Example 7 of the present application.

[0144] like Fig.14 As shown, in this embodiment, the optical imaging system includes a lens barrel and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4 and a fifth lens E5 accommodated in the lens barrel and arranged in sequence from the object side to the image side along the optical axis.

[0145] In this embodiment, the optical imaging system further comprises a plurality of spacing elements: a first spacing element P1, located on the image side of the first lens E1 and in at least partial contact with the image side surface of the first lens E1; a second spacing element P2, located on the image side of the second lens E2 and in at least partial contact with the image side surface of the second lens E2; a third spacing element P3, located on the image side of the third lens E3 and in at least partial contact with the image side surface of the third lens E3; a third auxiliary spacing element P3b, located on the image side of the third spacing element P3 and in at least partial contact with the image side surface of the third spacing element P3; a third auxiliary spacing element P3c, located on the image side of the third auxiliary spacing element P3b and in at least partial contact with the image side surface of the third auxiliary spacing element P3b; a fourth spacing element P4, located on the image side of the fourth lens E4 and in at least partial contact with the image side surface of the fourth lens E4; and a fourth auxiliary spacing element P4b, located on the image side of the fourth spacing element P4 and in at least partial contact with the image side surface of the fourth spacing element P4.

[0146] In this embodiment, the first lens E1 has positive power, its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has positive power, its object side surface S3 is convex, and its image side surface S4 is convex. The third lens E3 has negative power, its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive power, its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has negative power, its object side surface S9 is convex, and its image side surface S10 is concave.

[0147] Table 5 shows the basic parameters of the optical imaging system of Example 7, wherein the units of the radius of curvature, thickness / distance and effective radius are all millimeters (mm).

[0148]

[0149] Table 5

[0150] In this embodiment, the object side surface and the image side surface of any one of the first lens E1 to the fifth lens E5 are aspherical surfaces, and the surface shape of each aspherical surface can be defined by the formula (1) given in the above embodiment 1. Tables 6-1 and 6-2 show 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, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50,10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0151] Face number A4 A6 A8 A10 A12 A14 A16 S1 -3.1994E-04 7.3922E-04 -1.2064E-03 -1.1551E-04 9.6334E-04 -7.1872E-04 2.7727E-04 S2 -5.1242E-03 8.4183E-03 -2.3865E-02 1.7573E-02 -1.9141E-03 -4.1367E-03 2.8606E-03 S3 -6.3572E-03 9.5887E-03 -2.8251E-02 2.4032E-02 -7.1260E-03 -1.3966E-03 1.8393E-03 S4 2.9375E-02 -5.5454E-02 3.1838E-02 2.3859E-02 -4.9410E-02 3.7130E-02 -1.6854E-02 S5 2.0751E-02 -5.3969E-02 3.0281E-02 3.4091E-02 -6.5738E-02 4.9687E-02 -2.2403E-02 S6 -2.8932E-03 -1.2834E-02 2.2819E-02 -2.7709E-02 3.2270E-02 -3.2782E-02 2.4541E-02 S7 9.7947E-03 9.2362E-04 -2.0711E-02 5.2290E-02 -8.5181E-02 9.5228E-02 -7.5316E-02 S8 3.5638E-02 -2.1460E-02 1.7594E-02 -1.8025E-02 1.4617E-02 -8.4752E-03 3.3432E-03 S9 -1.0466E-01 6.2865E-02 -3.2035E-02 -2.7665E-04 1.8905E-02 -1.9674E-02 1.1838E-02 S10 -1.5721E-01 1.0861E-01 -8.3925E-02 5.6949E-02 -3.1825E-02 1.4358E-02 -5.1814E-03

[0152] Table 6-1

[0153]

[0154]

[0155] Table 6-2

[0156] Example 8

[0157] The following reference Fig.15 Describe the optical imaging system according to Example 8 of the present application.

[0158] like Fig.15 As shown, in this embodiment, the optical imaging system includes a lens barrel and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4 and a fifth lens E5 which are accommodated in the lens barrel and arranged in sequence from the object side to the image side along the optical axis. The optical imaging system also includes a plurality of spacing elements: a first spacing element P1, which is located on the image side of the first lens E1 and at least partially in contact with the image side surface of the first lens E1; a second spacing element P2, which is located on the image side of the second lens E2 and at least partially in contact with the image side surface of the second lens E2; a third spacing element P3, which is located on the image side of the third lens E3 and at least partially in contact with the image side surface of the third lens E3; a third auxiliary spacing element P3b, which is located on the image side of the third spacing element P3 and at least partially in contact with the image side surface of the third spacing element P3; a third auxiliary spacing element P3c, which is located on the image side of the third auxiliary spacing element P3b and at least partially in contact with the image side surface of the third auxiliary spacing element P3b; and a fourth spacing element P4, which is located on the image side of the fourth lens E4 and at least partially in contact with the image side surface of the fourth lens E4.

[0159] The structure of the optical imaging system of this embodiment is the same as that of the optical imaging system of Example 7, that is, the basic parameter table of the optical imaging system of this embodiment is the same as Table 5, and the high-order coefficient table of the aspheric mirror is the same as Table 6-1 and Table 6-2.

[0160] The difference between this embodiment and embodiment 7 lies in the different parameters such as the structural dimensions of the lens barrel and some of the spacing elements, the spacing of some of the spacing elements along the optical axis direction, and the maximum effective radius of the object side or image side of some of the lenses. The values ​​of multiple parameters of the lens barrel and the spacing elements included in the optical imaging system of this embodiment and embodiment 7 are also shown in Table 7 below, and the specific description of the multiple parameters is the same as that described in the above embodiment 2, and will not be repeated here.

[0161] Example 9

[0162] The following reference Fig.16 Describe the optical lens according to Example 9 of the present application.

[0163] like Fig.16 As shown, in this embodiment, the optical imaging system includes a lens barrel and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4 and a fifth lens E5 which are accommodated in the lens barrel and arranged in sequence from the object side to the image side along the optical axis. The optical imaging system also includes a plurality of spacing elements: a first spacing element P1, which is located on the image side of the first lens E1 and at least partially in contact with the image side surface of the first lens E1; a second spacing element P2, which is located on the image side of the second lens E2 and at least partially in contact with the image side surface of the second lens E2; a third spacing element P3, which is located on the image side of the third lens E3 and at least partially in contact with the image side surface of the third lens E3; a third auxiliary spacing element P3b, which is located on the image side of the third spacing element P3 and at least partially in contact with the image side surface of the third spacing element P3; and a fourth spacing element P4, which is located on the image side of the fourth lens E4 and at least partially in contact with the image side surface of the fourth lens E4.

[0164] The structure of the optical imaging system of this embodiment is also the same as the structure of the optical imaging system of Example 7, that is, the basic parameter table of the optical imaging system of this embodiment is the same as Table 5, and the high-order coefficient table of the aspheric mirror surface is the same as Table 6-1 and Table 6-2.

[0165] The difference between this embodiment and embodiment 7 is also that the structural dimensions of the lens barrel and some of the spacing elements, the spacing of some of the spacing elements along the optical axis, and the maximum effective radius of the object side or image side of some of the lenses are different. The values ​​of multiple parameters of the lens barrel and the spacing elements included in the optical imaging system of this embodiment and embodiment 7 are also shown in Table 7 below, and the specific description of the multiple parameters is also the same as that described in the above embodiment 2, and will not be repeated here.

[0166] Fig.17 Astigmatism curves of the optical imaging systems of Example 7, Example 8 and Example 9 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Fig.18Distortion curves of the optical imaging systems of Embodiment 7, Embodiment 8 and Embodiment 9 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Fig.19 The axial chromatic aberration curves of the optical imaging systems of Embodiment 7, Embodiment 8 and Embodiment 9 are shown, which indicate the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Figures 17 to 19 It can be seen that the optical imaging systems provided in Examples 7, 8 and 9 can achieve good imaging quality.

[0167] Parameters / Examples 1 2 3 4 5 6 7 8 9 d2s 3.97 3.71 4.99 4.21 4.34 4.45 4.72 4.72 5.02 D2s 6.06 6.46 6.22 6.06 6.46 6.46 6.56 6.86 6.86 D2m 6.06 6.46 6.17 6.06 6.46 6.46 6.56 6.86 6.86 d3s 3.25 3.25 3.28 3.62 3.62 3.62 3.99 3.98 3.99 d3m 3.25 3.25 3.28 3.62 3.62 3.62 3.99 3.98 3.99 D3s 5.82 6.22 6.22 5.92 6.32 6.32 6.42 6.72 6.72 D3m 5.82 6.22 6.22 5.92 6.32 6.32 6.42 6.72 6.72 d4s 4.15 4.16 3.87 4.11 4.11 5.12 4.42 4.29 4.27 d4m 4.70 4.70 3.87 4.70 4.11 4.56 4.96 4.29 4.27 D4s 5.28 5.70 5.86 5.53 6.22 5.77 5.97 6.38 6.38 D4m 5.34 5.64 5.86 5.44 6.22 5.74 5.70 6.38 6.38 d0s 6.47 6.87 6.87 6.47 6.87 6.87 6.98 7.28 7.28 D0s 11.08 11.08 11.08 11.08 11.08 11.08 11.08 11.08 11.08 EP12 0.83 0.92 0.77 0.70 0.64 0.60 0.69 0.63 0.52 EP34 2.03 1.94 1.76 2.47 2.39 2.51 3.02 3.32 3.22 L 8.93 8.93 8.93 8.93 8.93 8.93 8.93 8.93 8.93 d3bm 4.70 5.00 3.71 4.71 4.83 4.01 5.12 5.12 4.04 D3b 5.25 5.65 5.65 5.36 5.86 5.94 5.65 5.95 6.01 CP3b 1.59 1.44 1.26 2.03 1.73 1.56 2.38 2.28 2.41 ∑AT 3.17 3.17 3.17 3.52 3.52 3.52 4.27 4.27 4.27 ∑CT 3.40 3.40 3.40 3.62 3.62 3.62 3.30 3.30 3.30 ∑CP4 0.53 0.62 0.59 0.87 0.68 0.56 0.87 0.02 0.02 DT32 1.71 1.69 2.31 1.87 2.41 2.44 2.59 2.67 2.68 DT41 2.32 2.15 2.15 2.32 2.28 2.39 2.45 2.45 2.45 DT42 2.30 2.30 2.30 2.30 2.32 2.59 2.43 2.52 2.58 DT51 2.36 2.36 2.36 2.32 2.43 2.46 2.46 2.49 2.58

[0168] Table 7

[0169] In addition, in Examples 1 to 9, half of the maximum field of view angle Semi-FOV of the optical imaging system, the effective focal length f of the optical imaging system, and the effective focal length values ​​f1 to f5 of each lens from the first lens to the fifth lens are respectively as shown in Table 8 below.

[0170] Parameters / Examples 1 2 3 4 5 6 7 8 9 Semi-FOV(°) 20.06 20.06 20.06 19.14 19.14 19.14 16.60 16.60 16.60 f(mm) 12.13 12.13 12.13 13.01 13.01 13.01 14.35 14.35 14.35 f1(mm) 34.37 34.37 34.37 60.72 60.72 60.72 31.27 31.27 31.27 f2(mm) 5.59 5.59 5.59 5.64 5.64 5.64 5.93 5.93 5.93 f3(mm) -5.57 -5.57 -5.57 -6.71 -6.71 -6.71 -6.58 -6.58 -6.58 f4(mm) 5.78 5.78 5.78 24.75 24.75 24.75 8.83 8.83 8.83 f5(mm) -6.02 -6.02 -6.02 -20.60 -20.60 -20.60 -6.66 -6.66 -6.66

[0171] Table 8 Examples 1 to 9 respectively satisfy the conditions shown in Table 9 below.

[0172] Conditional / Example 1 2 3 4 5 6 7 8 9 L / ∑CT 2.62 2.62 2.62 2.47 2.47 2.47 2.70 2.70 2.70 Semi-FOV(°) 20.06 20.06 20.06 19.14 19.14 19.14 16.60 16.60 16.60 (d4s-d2s) / f2 0.03 0.08 -0.20 -0.02 -0.04 0.12 -0.05 -0.07 -0.13 (d4s-d2s) / f4 0.03 0.08 -0.19 0.00 -0.01 0.03 -0.03 -0.05 -0.08 D3s / DT32 3.40 3.68 2.69 3.17 2.62 2.59 2.48 2.52 2.50 D4s / DT42 2.29 2.47 2.54 2.40 2.68 2.23 2.46 2.53 2.47 R2 / EP12×N1 8.18 7.37 8.80 8.73 9.44 10.21 10.16 11.16 13.39 (D2m-d3s) / (CT2+CT3) 1.44 1.65 1.48 1.28 1.49 1.49 1.42 1.59 1.59 T34 / (L-∑AT) 0.43 0.43 0.43 0.54 0.54 0.54 0.77 0.77 0.77 (D0s-d0s) / (R2-R1) 7.38 6.74 6.74 20.57 18.78 18.78 5.21 4.84 4.84 (D3m-d3m) / R6 0.78 0.91 0.90 0.64 0.75 0.75 0.64 0.73 0.72 (D4m-DT51) / d4m 0.63 0.70 0.90 0.67 0.92 0.72 0.65 0.91 0.89 EP34 / (R6+|R7|) 0.20 0.19 0.17 0.23 0.22 0.23 0.28 0.30 0.30 D2s / R3 1.50 1.60 1.54 1.64 1.75 1.75 1.56 1.63 1.63 D3s / R5 0.09 0.09 0.09 0.22 0.23 0.23 0.12 0.12 0.12 (D3bm-d3bm) / DT41 0.24 0.30 0.90 0.28 0.45 0.81 0.22 0.34 0.81 |f3| / CP3b×d3s(mm) 11.39 12.58 14.58 11.96 14.08 15.57 11.01 11.48 10.88 ∑CP4 / (T45+CT4+CT5) 0.50 0.59 0.56 0.56 0.44 0.36 0.63 0.02 0.02 (D4s-d3s) / EP34 1.00 1.26 1.46 0.78 1.09 0.86 0.66 0.72 0.74

[0173] Table 9

[0174] The present application also provides an imaging device, which is provided with an electronic photosensitive element for imaging, and the electronic photosensitive element can be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated in a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging system described above.

[0175] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of protection involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the concept of the present application. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) to form a technical solution.

Claims

1. An optical imaging system, characterized in that: It includes a lens barrel, a lens group, and a plurality of spacer elements accommodated in the lens barrel. Among them, the lens group includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged in sequence from the object side to the image side along the optical axis. The first lens has a positive optical power, the second lens has a positive optical power, the third lens has a negative optical power, the fourth lens has a positive optical power, and the fifth lens has a negative optical power; the plurality of spacer elements at least include: a first spacer element located on the image side of the first lens and at least partially in contact with the image side surface of the first lens; a second spacer element located on the image side of the second lens and at least partially in contact with the image side surface of the second lens; a third spacer element located on the image side of the third lens and at least partially in contact with the image side surface of the third lens; a fourth spacer element located on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens; the optical imaging system satisfies: 2.40 < L / ∑CT < 2.75, 12° < Semi-FOV < 25° and -0.24 < (d4s - d2s) / f2 < 0.15, -0.22 < (d4s - d2s) / f4 < 0.10, wherein, L is the maximum height of the lens barrel, ∑CT is the sum of the central thicknesses of each lens from the first lens to the fifth lens on the optical axis, Semi-FOV is half of the maximum field of view angle of the optical imaging system, d4s is the inner diameter of the object side surface of the fourth spacer element, d2s is the inner diameter of the object side surface of the second spacer element, f2 is the effective focal length of the second lens, and f4 is the effective focal length of the fourth lens.

2. The optical imaging system according to claim 1, characterized in that: The outer diameter D3s of the object side surface of the third spacer element, the maximum effective radius DT32 of the image side surface of the third lens, the outer diameter D4s of the object side surface of the fourth spacer element, and the maximum effective radius DT42 of the image side surface of the fourth lens satisfy: 2.18 < D3s / DT32 < 3.72 and 2.15 < D4s / DT42 < 2.

75.

3. The optical imaging system according to claim 1, characterized in that: The radius of curvature R2 of the image side surface of the second lens, the distance EP12 between the first spacer element and the second spacer element on the optical axis, and the refractive index N1 of the first lens satisfy: 7.34 < R2 / EP12 × N1 < 13.

45.

4. The optical imaging system according to claim 1, characterized in that: The outer diameter D2m of the image side surface of the second spacer element, the inner diameter d3s of the object side surface of the third spacer element, the central thickness CT2 of the second lens on the optical axis, and the central thickness CT3 of the third lens on the optical axis satisfy: 1.23 < (D2m - d3s) / (CT2 + CT3) < 1.

70.

5. The optical imaging system according to claim 1, characterized in that: The air gap T34 between the third lens and the fourth lens on the optical axis and the sum ∑AT of the air gaps between any two adjacent lenses with optical power on the optical axis in the optical imaging system satisfy: 0.38 < T34 / (L - ∑AT) < 0.

80.

6. The optical imaging system according to claim 1, characterized in that: The outer diameter D0s of the object-side end face of the lens barrel, the inner diameter d0s of the object-side end face of the lens barrel, the curvature radius R2 of the image-side surface of the first lens, and the curvature radius R1 of the object-side surface of the first lens satisfy: 4.78 < (D0s - d0s) / (R2 - R1) < 20.

60.

7. The optical imaging system according to claim 1, characterized in that: The outer diameter D3m of the image-side surface of the third spacer element, the inner diameter d3m of the image-side surface of the third spacer element, and the curvature radius R6 of the image-side surface of the third lens satisfy: 0.60 < (D3m - d3m) / R6 < 0.

96.

8. The optical imaging system according to claim 1, characterized in that: The outer diameter D4m of the image-side surface of the fourth spacer element, the maximum effective radius DT51 of the object-side surface of the fifth lens, and the inner diameter d4m of the image-side surface of the fourth spacer element satisfy: 0.59 < (D4m - DT51) / d4m < 0.

95.

9. The optical imaging system according to claim 1, characterized in that: The distance EP34 on the optical axis from the third spacer element to the fourth spacer element, the curvature radius R6 of the image-side surface of the third lens, and the curvature radius R7 of the object-side surface of the fourth lens satisfy: 0.13 < EP34 / (R6 + |R7|) < 0.

37.

10. The optical imaging system according to claim 1, characterized in that: The outer diameter D2s of the object-side surface of the second spacer element, the curvature radius R3 of the object-side surface of the second lens, the outer diameter D3s of the object-side surface of the third spacer element, and the curvature radius R5 of the object-side surface of the third lens satisfy: 1.41 < D2s / R3 < 1.79 and 0.04 < D3s / R5 < 0.

28.

11. The optical imaging system according to claim 1, characterized in that: The plurality of spacer elements further includes: a third auxiliary spacer element, located on the image side of the third spacer element and at least partially in contact with the image-side surface of the third spacer element; The outer diameter D3bm of the image-side surface of the third auxiliary spacer element, the inner diameter d3bm of the image-side surface of the third auxiliary spacer element, and the maximum effective radius DT41 of the object-side surface of the fourth lens satisfy: 0.17 < (D3bm - d3bm) / DT41 < 0.

94.

12. The optical imaging system according to claim 1, characterized in that: The plurality of spacer elements further includes: a third auxiliary spacer element, located on the image side of the third spacer element and at least partially in contact with the image-side surface of the third spacer element; The effective focal length f3 of the third lens, the maximum thickness CP3b of the third auxiliary spacer element in the optical axis direction, and the inner diameter d3s of the object-side surface of the third spacer element satisfy: 10.80 mm < |f3| / CP3b × d3s < 15.59 mm.

13. The optical imaging system according to claim 1, characterized in that: The sum ∑CP4 of the maximum thicknesses in the optical axis direction of one or more spacer elements including the fourth spacer element located between the fourth lens and the fifth 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: 0.00 < ∑CP4 / (T45 + CT4 + CT5) < 0.

66.

14. The optical imaging system according to claim 1, characterized in that: The outer diameter D4s of the object-side surface of the fourth spacer element, the inner diameter d3s of the object-side surface of the third spacer element, and the distance EP34 on the optical axis from the third spacer element to the fourth spacer element satisfy: 0.61<(D4s-d3s) / EP34<1.

50.

15. The optical imaging system according to any one of claims 1 to 14, characterized in that: The lens barrel comprises an object side boss structure and an image side boss structure, wherein the object side boss structure and the image side boss structure protrude outward from the outer peripheral surface of the lens barrel at the object side end and the image side end of the lens barrel respectively, and the object side boss structure and the image side boss structure form a groove with the outer peripheral surface of the lens barrel located therebetween, and the groove is used for assembling the module connector.

16. A camera module, characterized in that: An optical imaging system comprising any one of claims 1 to 15; A module connector, assembled on the lens barrel of the optical imaging system; as well as A module driver drives the optical imaging system via the module connector.

Images