Optical imaging device

Abstract

The embodiment of the utility model discloses an optical imaging device, which comprises a lens barrel, a lens group and a spacing element group, the lens group and the spacing element group are accommodated in the lens barrel, the lens barrel comprises an outer ring surface and an inner ring surface, and the inner ring surface is in a step shape; the lens group comprises a first lens, a second lens, a third lens and a fourth lens which are sequentially arranged from the object side to the image side along the optical axis, the second lens has negative focal power; the third lens has negative focal power; the fourth lens has positive focal power; the fifth lens has negative focal power; the sixth lens has positive focal power; the seventh lens has negative focal power; the spacing element group at least comprises a fourth spacing element which is arranged on the image side surface of the fourth lens and is at least partially contacted with the image side surface of the fourth lens; the fifth spacing element is arranged on the image side surface of the fifth lens and is at least partially contacted with the image side surface of the fifth lens; and the sixth spacing element is arranged on the image side surface of the sixth lens and is at least partially contacted with the image side surface of the sixth lens.

Description

Technical Field

[0001] The present application relates to the field of optical elements, and in particular, to an optical imaging device comprising multiple lenses. Background Art

[0002] Nowadays, high-definition imaging lenses play an increasingly important role in portable electronic products such as smartphones. People have put forward more requirements for imaging lenses, and the pixel requirements for shooting electronic products such as mobile phones have also increased. Therefore, high-pixel, large-image imaging lenses have become the development trend of the industry.

[0003] However, large image surface imaging lenses are usually accompanied by large step differences, which can easily lead to assembly instability. Especially between the lenses at the rear of the lens, when the air gap is too large, it is easy to cause stress concentration during the assembly of the corresponding lenses, affecting the stability of the lens assembly and thus the imaging quality; but reducing the gap will cause the light deflection angle to be too large, the light will be steeper, the lens will be more sensitive, and the lens yield will be affected.

[0004] As mentioned above, current imaging lenses often have at least one problem, such as unstable assembly, poor sensitivity of some lenses, and low lens performance yield. Therefore, how to optimize the structure of the imaging lens to improve the imaging quality is one of the technical problems that those skilled in the art are committed to solving. Utility Model Content

[0005] On the one hand, the present application provides an optical imaging device, which includes a lens barrel, a lens group and a spacer element group, wherein the lens group and the spacer element group are both accommodated in the lens barrel, wherein the lens barrel includes an outer annular surface and an inner annular surface, and the inner annular surface is stepped; the lens group includes: a first lens with positive optical power, whose object side surface is convex and whose image side surface is concave; a second lens with negative optical power, whose object side surface is convex and whose image side surface is concave; a third lens with negative optical power, whose object side surface is convex and whose image side surface is concave; a fourth lens with positive optical power, whose object side surface is convex and whose image side surface is convex; a fifth lens with negative optical power, whose object side surface is convex and whose image side surface is concave; a sixth lens with positive optical power, whose object side surface is convex and whose image side surface is concave; and a seventh lens with negative optical power, whose object side surface is convex and whose image side surface is concave; the spacer element group at least includes: a fourth lens with positive optical power, whose object side surface is convex and whose image side surface is convex; a fifth lens with negative optical power, whose object side surface is convex and whose image side surface is concave; a sixth lens with positive optical power, whose object side surface is convex and whose image side surface is concave; and a seventh lens with negative optical power, whose object side surface is convex and whose image side surface is concave; A spacer element is disposed on the image side surface of the fourth lens and is in at least partial contact with the image side surface of the fourth lens; a fifth spacer element is disposed on the image side surface of the fifth lens and is in at least partial contact with the image side surface of the fifth lens; and a sixth spacer element is disposed on the image side surface of the sixth lens and is in at least partial contact with the image side surface of the sixth lens; wherein the aperture number FNO of the optical imaging device satisfies: 1.5<≤FNO≤<2.0; an inner diameter d5s of the object side surface of the fifth spacer element, an outer diameter D5s of the object side surface of the fifth spacer element, and an outer diameter D6s of the object side surface of the sixth spacer element satisfy: 0.80<(D5s-d5s) / (D6s-d5s)<1.20; and a distance EP45 from the fourth spacer element to the fifth spacer element along the optical axis, an air gap T56 between the fifth lens and the sixth lens on the optical axis, and a center thickness CT5 of the fifth lens on the optical axis satisfy: 1.20<(EP45-T56) / CT5<2.50.

[0006] In one embodiment, the inner diameter d0s of the object side end surface of the lens barrel and the combined focal length f12 of the first lens and the second lens satisfy: 0.30 <d0s / f12<0.45。

[0007] In one embodiment, the inner diameter d5s of the object side of the fifth spacer element, the outer diameter D5s of the object side of the fifth spacer element, the center thickness CT5 of the fifth lens, and the air gap T56 between the fifth lens and the sixth lens on the optical axis satisfy: 12<(D5s-d5s) / (CT5-T56)<20.

[0008] In one embodiment, the distance EP45 from the image side surface of the fourth spacing element to the object side surface of the fifth spacing element along the optical axis and the center thickness CT5 of the fifth lens on the optical axis satisfy: 1.60 <EP45 / CT5<3.10。

[0009] In one embodiment, the outer diameter D0m of the image side end surface of the lens barrel, the inner diameter d6s of the object side surface of the sixth spacer element, and the effective focal length f6 of the sixth lens satisfy: 0.50<(D0m-d6s) / f6<0.80.

[0010] In one embodiment, the spacer element group further includes a second spacer element disposed on the image side surface of the second lens and at least partially in contact with the image side surface of the second lens, and the inner diameter d0s of the object side end surface of the lens barrel, the inner diameter d2s of the object side surface of the second spacer element, the combined focal length f12 of the first lens and the second lens, and the total effective focal length f of the optical imaging device satisfy: 1.20 <d0s / d2s*(f12 / f)<2.0。

[0011] In one embodiment, the spacer element group further includes a second spacer element disposed on the image side surface of the second lens and at least partially in contact with the image side surface of the second lens, and the distance EP02 from the object side end surface of the lens barrel to the object side surface of the second spacer element along the optical axis, and the axial distance SAGH22 from the intersection of the image side surface of the second lens and the optical axis to the bearing end of the second spacer element on the image side surface of the second lens satisfies: 3.60 <EP02 / |SAGH22|<5.80。

[0012] In one embodiment, the air gap T67 between the sixth lens and the seventh lens on the optical axis, the distance EP56 from the image side surface of the fifth spacer element to the object side surface of the sixth spacer element along the optical axis, and the axial distance SAGH62 from the intersection of the image side surface of the sixth lens and the optical axis to the supporting end of the sixth spacer element on the image side surface of the sixth lens satisfy: 2.60<(T67+EP56) / |SAGH62|<3.40.

[0013] In one embodiment, the spacer element group further includes a second spacer element disposed on the image side surface of the second lens and at least partially in contact with the image side surface of the second lens, and the inner diameter d2s of the object side surface of the second spacer element, the Abbe number V1 of the first lens, and the effective focal length f1 of the first lens satisfy: <d2s*V1 / f1<28。

[0014] In one embodiment, the spacer element group also includes a third spacer element disposed on the image side surface of the third lens and at least partially in contact with the image side surface of the third lens, and the curvature radius R5 of the object side surface of the third lens, the curvature radius R6 of the image side surface of the third lens, and the outer diameter D3s of the object side surface of the third spacer element satisfy: 0.50<(R5-R6) / D3s<1.30.

[0015] In one embodiment, the spacer element group further includes a fourth auxiliary spacer element disposed between the image side of the fourth lens and the object side of the fifth lens, and the outer diameter D4bm of the object side of the fourth auxiliary spacer element, the Abbe number V4 of the fourth lens, and the curvature radius R8 of the image side of the fourth lens satisfy: -40 < D4bm * V4 / R8 < -22.

[0016] In one embodiment, the spacer element group further includes a third spacer element disposed on the image side of the third lens and at least partially in contact with the image side of the third lens, and the outer diameter D5s of the object side of the fifth spacer element, the inner diameter d5s of the object side of the fifth spacer element, the outer diameter D4s of the object side of the fourth spacer element, and the inner diameter d3s of the object side of the third spacer element satisfy: 0.70 < (D5s - D4s) / (d5s - d3s) < 1.45.

[0017] In one embodiment, the lens barrel includes a first lens barrel and a second lens barrel. The first lens is accommodated in the first lens barrel and the first lens is fixedly connected to the first lens barrel by dispensing glue; the second lens to the seventh lens are accommodated in the second lens barrel.

[0018] In one embodiment, the spacer element group further includes a third spacer element disposed on the image side of the third lens and at least partially in contact with the image side of the third lens. The distance EP34 along the optical axis from the image side of the third spacer element to the object side of the fourth spacer element, the distance EP45 along the optical axis from the image side of the fourth spacer element to the object side of the fifth spacer element, and the air gap T23 between the second lens and the third lens on the optical axis satisfy: 2.0 < (EP34 + EP45) / T23 < 3.10.

[0019] In one embodiment, the curvature radius R10 of the image side of the fifth lens and the curvature radius R11 of the object side of the sixth lens satisfy: 1.50 < R10 / R11 < 2.00; and the outer diameter D6s of the object side of the sixth spacer element, the inner diameter d5s of the object side of the fifth spacer element, the distance EP45 along the optical axis from the image side of the fourth spacer element to the object side of the fifth spacer element, and the air gap T56 between the fifth lens and the sixth lens on the optical axis satisfy: 2.5 < (D6s - d5s) / (EP45 - T56) < 6.0.

[0020] In one embodiment, the spacer element group further includes a second spacer element disposed on the image side of the second lens and at least partially in contact with the image side of the second lens, and the inner diameter of the object side of the second spacer element is the minimum among the inner diameters of the object sides of all the spacer elements in the spacer element group.

[0021] In one embodiment, the spacer element group further includes a third spacer element disposed on the image side surface of the third lens and at least partially in contact with the image side surface of the third lens. The outer diameter D4s of the object side surface of the fourth spacer element, the Abbe number V4 of the fourth lens, the effective focal length f4 of the fourth lens, the distance EP34 along the optical axis direction from the image side surface of the third spacer element to the object side surface of the fourth spacer element, and the central thickness CT4 of the fourth lens on the optical axis satisfy: 19.50 < D4s * V4 / f4 < 29.00; and 10 < f4 / (EP34 + CT4) < 18.

[0022] On the other hand, the present application provides an optical imaging device, which includes a lens barrel, a lens group, and a spacer element group. The lens group and the spacer element group are both accommodated in the lens barrel. Among them, the lens barrel includes an outer ring surface and an inner ring surface, and the inner ring surface is stepped; the lens group includes, in order from the object side to the image side along the optical axis: a first lens with a positive optical power, whose object side surface is convex and image side surface is concave; a second lens with a negative optical power, whose object side surface is convex and image side surface is concave; a third lens with a negative optical power, whose object side surface is convex and image side surface is concave; a fourth lens with a positive optical power, whose object side surface is convex and image side surface is convex; a fifth lens with a negative optical power, whose object side surface is convex and image side surface is concave; a sixth lens with a positive optical power, whose object side surface is convex and image side surface is concave; and a seventh lens with a negative optical power, whose object side surface is convex and image side surface is concave; the spacer element group at least includes: a third spacer element disposed on the image side surface of the third lens and at least partially in contact with the image side surface of the third lens; and a fourth spacer element disposed on the image side surface of the fourth lens and at least partially in contact with the image side surface of the fourth lens; among them, the outer diameter D4s of the object side surface of the fourth spacer element, the Abbe number V4 of the fourth lens, the effective focal length f4 of the fourth lens, the distance EP34 along the optical axis direction from the image side surface of the third spacer element to the object side surface of the fourth spacer element, and the central thickness CT4 of the fourth lens on the optical axis satisfy: 19.50 < D4s * V4 / f4 < 29.00; and 10 < f4 / (EP34 + CT4) < 18.

[0023] In one embodiment, the inner diameter d0s of the object side end surface of the lens barrel and the combined focal length f12 of the first lens and the second lens satisfy: 0.30 < d0s / f12 < 0.45.

[0024] In one embodiment, the spacer element group further includes a fifth spacer element disposed on the image side surface of the fifth lens and at least partially in contact with the image side surface of the fifth lens. The inner diameter d5s of the object side surface of the fifth spacer element, the outer diameter D5s of the object side surface of the fifth spacer element, the central thickness CT5 of the fifth lens, and the air gap T56 between the fifth lens and the sixth lens on the optical axis satisfy: 12 < (D5s - d5s) / (CT5 - T56) < 20.

[0025] In one embodiment, the spacer element group further includes a fifth spacer element disposed on the image side surface of the fifth lens and at least partially in contact with the image side surface of the fifth lens, and the distance EP45 from the image side surface of the fourth spacer element to the object side surface of the fifth spacer element along the optical axis and the center thickness CT5 of the fifth lens on the optical axis satisfy: 1.60 <EP45 / CT5<3.10。

[0026] In one embodiment, the spacer element group also includes a sixth spacer element disposed on the image side surface of the sixth lens and at least partially in contact with the image side surface of the sixth lens. The outer diameter D0m of the image side end surface of the lens barrel, the inner diameter d6s of the object side surface of the sixth spacer element, and the effective focal length f6 of the sixth lens satisfy: 0.50<(D0m-d6s) / f6<0.80.

[0027] In one embodiment, the spacer element group further includes a second spacer element disposed on the image side surface of the second lens and at least partially in contact with the image side surface of the second lens, and the inner diameter d0s of the object side end surface of the lens barrel, the inner diameter d2s of the object side surface of the second spacer element, the combined focal length f12 of the first lens and the second lens, and the total effective focal length f of the optical imaging device satisfy: 1.20 <d0s / d2s*(f12 / f)<2.0。

[0028] In one embodiment, the spacer element group further includes a second spacer element disposed on the image side surface of the second lens and at least partially in contact with the image side surface of the second lens, and the distance EP02 from the object side end surface of the lens barrel to the object side surface of the second spacer element along the optical axis, and the axial distance SAGH22 from the intersection of the image side surface of the second lens and the optical axis to the bearing end of the second spacer element on the image side surface of the second lens satisfies: 3.60 <EP02 / |SAGH22|<5.80。

[0029] In one embodiment, the spacer element group also includes a fifth spacer element disposed on the image side surface of the fifth lens and at least partially in contact with the image side surface of the fifth lens, and a sixth spacer element disposed on the image side surface of the sixth lens and at least partially in contact with the image side surface of the sixth lens. The air gap T67 between the sixth lens and the seventh lens on the optical axis, the distance EP56 from the image side surface of the fifth spacer element to the object side surface of the sixth spacer element along the optical axis, and the axial distance SAGH62 from the intersection of the image side surface of the sixth lens and the optical axis to the bearing end of the sixth spacer element on the image side surface of the sixth lens satisfy: 2.60<(T67+EP56) / |SAGH62|<3.40.

[0030] In one embodiment, the spacer element group further includes a second spacer element disposed on the image side surface of the second lens and at least partially in contact with the image side surface of the second lens, and the inner diameter d2s of the object side surface of the second spacer element, the Abbe number V1 of the first lens, and the effective focal length f1 of the first lens satisfy: <d2s*V1 / f1<28。

[0031] In one embodiment, a curvature radius R5 of the object-side surface of the third lens, a curvature radius R6 of the image-side surface of the third lens, and an outer diameter D3s of the object-side surface of the third spacer element satisfy: 0.50<(R5-R6) / D3s<1.30.

[0032] In one embodiment, the spacer element group further includes a fourth auxiliary spacer element disposed between the image side surface of the fourth lens and the object side surface of the fifth lens, and the outer diameter D4bm of the object side surface of the fourth auxiliary spacer element, the Abbe number V4 of the fourth lens, and the curvature radius R8 of the image side surface of the fourth lens satisfy: -40 <D4bm*V4 / R8<-22。

[0033] In one embodiment, the spacer element group also includes a fifth spacer element disposed on the image side surface of the fifth lens and at least partially in contact with the image side surface of the fifth lens, and an outer diameter D5s of the object side surface of the fifth spacer element, an inner diameter d5s of the object side surface of the fifth spacer element, an outer diameter D4s of the object side surface of the fourth spacer element, and an inner diameter d3s of the object side surface of the third spacer element satisfy: 0.70<(D5s-D4s) / (d5s-d3s)<1.45.

[0034] In one embodiment, the spacer element group also includes a fifth spacer element disposed on the image side surface of the fifth lens and at least partially in contact with the image side surface of the fifth lens, the distance EP34 from the image side surface of the third spacer element to the object side surface of the fourth spacer element along the optical axis, the distance EP45 from the image side surface of the fourth spacer element to the object side surface of the fifth spacer element along the optical axis, and the air gap T23 between the second lens and the third lens on the optical axis satisfy: 2.0<(EP34+EP45) / T23<3.10.

[0035] In one embodiment, the spacer element group further includes a fifth spacer element disposed on the image side of the fifth lens and at least partially in contact with the image side of the fifth lens, and a sixth spacer element disposed on the image side of the sixth lens and at least partially in contact with the image side of the sixth lens. The radius of curvature R10 of the image side of the fifth lens and the radius of curvature R11 of the object side of the sixth lens satisfy: 1.50 < R10 / R11 < 2.00; and the outer diameter D6s of the object side of the sixth spacer element, the inner diameter d5s of the object side of the fifth spacer element, the distance EP45 along the optical axis from the image side of the fourth spacer element to the object side of the fifth spacer element, and the air gap T56 between the fifth lens and the sixth lens on the optical axis satisfy: 2.5 < (D6s - d5s) / (EP45 - T56) < 6.0.

[0036] In one embodiment, the spacer element group further includes a second spacer element disposed on the image side of the second lens and at least partially in contact with the image side of the second lens. The inner diameter of the object side of the second spacer element is the minimum among the inner diameters of the object sides of all the spacer elements in the spacer element group.

[0037] In one embodiment, the spacer element group further includes a fifth spacer element disposed on the image side of the fifth lens and at least partially in contact with the image side of the fifth lens. The f-number FNO of the optical imaging device satisfies: 1.5 ≤ FNO ≤ 2.0; the inner diameter d5s of the object side of the fifth spacer element, the outer diameter D5s of the object side of the fifth spacer element, and the outer diameter D6s of the object side of the sixth spacer element satisfy: 0.80 < (D5s - d5s) / (D6s - d5s) < 1.20; and the distance EP45 along the optical axis from the fourth spacer element to the fifth spacer element, the air gap T56 between the fifth lens and the sixth lens on the optical axis, and the central thickness CT5 of the fifth lens on the optical axis satisfy: 1.20 < (EP45 - T56) / CT5 < 2.50.

[0038] In one embodiment, the lens barrel includes a first lens barrel and a second lens barrel. The first lens is accommodated in the first lens barrel and the first lens is fixedly connected to the first lens barrel by dispensing glue; the second lens to the seventh lens are accommodated in the second lens barrel.

[0039] The optical imaging device provided in the embodiment of the present application may include a lens barrel and a lens group and a spacer element group accommodated in the lens barrel. By arranging spacer elements and auxiliary spacer elements between different lenses of the lens group, and coordinating the spacer elements with the lenses and the lens barrel, not only the stability of the lens assembly can be improved, but also the risk of stray light can be effectively avoided and the interference with the image quality can be reduced, thereby improving the imaging quality of the optical imaging device; in addition, the optical imaging device provided in the embodiment of the present application can also effectively improve the stray light reflected by the color filter to the fifth lens while meeting the requirement of a large image surface of the main camera lens, and can effectively improve the stability of the assembly, so that its assembly stability is better, thereby improving the imaging quality of the optical imaging device. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0041] Figure 1 A schematic structural diagram of an optical imaging device provided according to an embodiment of the present application is shown;

[0042] Figure 2A and Figure 2B Schematic diagrams of axial deformation cloud diagrams and stress cloud diagrams are respectively shown for some optical imaging devices in the related art that have assembly deformation problems;

[0043] Figure 3A and Figure 3B Schematic diagrams of axial deformation cloud diagrams and stress cloud diagrams are respectively shown for other optical imaging devices in the related art that have stress concentration problems;

[0044] Figure 4A and Figure 4B Schematic diagrams of an axial deformation cloud map and a stress cloud map of an optical imaging device without obvious stress concentration phenomenon provided in accordance with an embodiment of the present application are respectively shown;

[0045] Figure 5 A schematic structural diagram of an optical imaging device according to Embodiment 1 of the present application is shown;

[0046] Figure 6 A schematic structural diagram of an optical imaging device according to Embodiment 2 of the present application is shown;

[0047] Figure 7 A schematic structural diagram of an optical imaging device according to Embodiment 3 of the present application is shown;

[0048] FIG. 8A to FIG. 8C The axial chromatic aberration curve, the astigmatism curve, and the distortion curve of the optical imaging device according to Embodiments 1 to 3 of the present application are respectively shown;

[0049] Fig. 9 A schematic structural diagram of an optical imaging device according to Embodiment 4 of the present application is shown;

[0050] Fig.10 A schematic structural diagram of an optical imaging device according to Embodiment 5 of the present application is shown;

[0051] Fig.11 A schematic structural diagram of an optical imaging device according to Embodiment 6 of the present application is shown; and

[0052] FIG. 12A to FIG. 12C The axial chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging device according to Examples 4 to 6 of the present application are respectively shown. DETAILED DESCRIPTION

[0053] 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.

[0054] 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.

[0055] 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.

[0056] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side of the lens, and the surface of each lens closest to the imaging plane is called the image side of the lens.

[0057] 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.

[0058] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as those 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.

[0059] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The following embodiments only express several implementation methods of the present application, and the descriptions 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, without departing from the concept of the present application, several deformations and improvements can be made, which all belong to the protection scope of the present application. For example, the lens groups (i.e., the first lens to the sixth lens), the lens barrel structure and the spacing elements in the embodiments of the present application can be arbitrarily combined, and are not limited to the lens group in one embodiment can only be combined with the lens barrel structure, spacing elements, etc. of the embodiment.

[0060] The features, principles and other aspects of the present application will be described in detail below with reference to the accompanying drawings.

[0061] refer to Figure 1 As shown, the first aspect of the present application provides such an optical imaging device, which may include a lens barrel, a lens group and a spacer element group, wherein the spacer element group may include at least one spacer element. The lens group and one or more spacer elements in the spacer element group are all accommodated in the lens barrel.

[0062] The lens barrel may include an object side end surface (front end surface close to the object side), an image side end surface (rear end surface close to the object side), an outer annular surface and an inner annular surface. In an exemplary embodiment, the inner annular surface of the lens barrel is stepped.

[0063] Figure 1The following also illustrates some parameters of the lens barrel of an optical imaging device and some of the spacing elements in the spacing element group of the present application, so as to facilitate a better understanding of the present invention. Figure 1 As shown, EP02 represents the distance between the object side end face of the lens barrel and the object side face of the second spacing element along the optical axis; EP45 represents the distance between the image side face of the fourth spacing element and the object side face of the fifth spacing element along the optical axis; d0s represents the inner diameter of the object side end face of the lens barrel (in a plane perpendicular to the optical axis); d0m represents the inner diameter of the image side end face of the lens barrel (in a plane perpendicular to the optical axis); D5s represents the outer diameter of the object side face of the fifth spacing element; d5s represents the inner diameter of the object side face of the fifth spacing element; D4m represents the outer diameter of the image side face of the fourth spacing element; d4s represents the inner diameter of the object side face of the fourth spacing element, and so on. Those skilled in the art should understand that some parameters frequently used in this field, such as the center thickness CT1 of the first lens on the optical axis, are not included in the optical axis. Figure 1 Shown in.

[0064] In an exemplary embodiment, the lens group may include seven lenses with optical power, which are arranged in sequence from the object side to the image side along the optical axis: a first lens with positive optical power, a second lens with negative optical power, a third lens with negative optical power, a fourth lens with positive optical power, a fifth lens with negative optical power, a sixth lens with positive optical power, and a seventh lens with negative optical power. The first to seventh lenses in the lens group are arranged in sequence from the object side to the imaging surface side along the optical axis, and each lens has at least an object side surface facing the object side and an image side surface facing the imaging surface side. Among them, any two adjacent lenses from the first to seventh lenses may have a spacing distance.

[0065] In an exemplary embodiment, the spacer element group may include at least one of: a fourth spacer element placed between the fourth lens and the fifth lens and at least partially in contact with the image side surface of the fourth lens, a fifth spacer element placed between the fifth lens and the sixth lens and at least partially in contact with the image side surface of the fifth lens, and a sixth spacer element placed between the sixth lens and the seventh lens and at least partially in contact with the image side surface of the sixth lens.

[0066] The optical imaging device according to the exemplary embodiment of the present application can satisfy: 1.5≤FNO≤2.0, where FNO is the aperture number of the imaging device. Satisfying FNO is greater than or equal to 1.5 and less than or equal to 2.0 helps to meet the requirement of a large image surface of the optical imaging device.

[0067] In an exemplary embodiment, the optical imaging device may satisfy: 0.80<(D5s-d5s) / (D6s-d5s)<1.20, where d5s is the inner diameter of the object side surface of the fifth spacer element, D5s is the outer diameter of the object side surface of the fifth spacer element, and d6s is the inner diameter of the object side surface of the sixth spacer element. Meeting this condition is conducive to effectively improving the stray light returned by the color filter to the fifth lens while meeting the requirement of a large image surface of the main camera lens.

[0068] In an exemplary embodiment, the optical imaging device may satisfy: 1.20<(EP45-T56) / CT5<2.50, wherein EP45 is the distance from the fourth spacing element to the fifth spacing element along the optical axis, and T56 is the air spacing between the fifth lens and the sixth lens on the optical axis. When 1.20<(EP45-T56) / CT5<2.50 is satisfied, the stability of the assembly can be effectively improved.

[0069] As described above, when the optical imaging device satisfies the condition that FNO is greater than or equal to 1.5 and less than or equal to 2.0, it helps to meet the requirement of a large image surface of the main camera lens, but at the same time it will cause the assembly step difference between the object side surface and the image side bearing surface of the fifth lens to increase, making the stability of the assembly worse.

[0070] refer to Figure 2A and Figure 2B As shown in the figure, when (EP45-T56) / CT5<1.2 (the specific value is 1.1), there is no obvious stress concentration phenomenon in the fifth lens. However, due to the obvious misalignment between the outer diameter bearing position and the center of the lens in the axial direction, there is obvious assembly deformation at the center position of the fifth lens, resulting in poor performance.

[0071] Next reference Figure 3A and Figure 3B When 2.5<(EP45-T56) / CT5 (the specific value is 2.6), it can be seen that the fifth lens has an obvious stress concentration problem. Therefore, during assembly, the fifth lens is prone to abnormal phenomena such as assembly tilt and deformation, resulting in low assembly stability.

[0072] According to the optical imaging device of the exemplary embodiment of the present application, by satisfying 1.20<(EP45-T56) / CT5<2.50, it is beneficial to improve the assembly deformation of the fifth lens and improve the lens assembly stability. Figure 4A and Figure 4B As shown, when the optical imaging device satisfies 1.20<(EP45-T56) / CT5<2.50 (the specific value is 2.0), it can be seen that the fifth lens has no obvious stress concentration phenomenon and the deformation at the center position also converges significantly.

[0073] The second aspect of the present application also provides such an optical imaging device, which in combination with Figure 1 as shown, may include a lens barrel, a lens group, and a spacer element group, where the spacer element group may include at least one spacer element. The lens group and one or more spacer elements in the spacer element group are all accommodated in the lens barrel.

[0074] In an exemplary embodiment, the lens group may include seven lenses with optical power, which are respectively arranged in order from the object side to the image side along the optical axis: a first lens with positive optical power, whose object side is convex and image side is concave; a second lens with negative optical power, whose object side is convex and image side is concave; a third lens with negative optical power, whose object side is convex and image side is concave; a fourth lens with positive optical power, whose object side is convex and image side is convex; a fifth lens with negative optical power, whose object side is convex and image side is concave; a sixth lens with positive optical power, whose object side is convex and image side is concave; and a seventh lens with negative optical power, whose object side is convex and image side is concave. The first lens to the seventh lens in the lens group are arranged in order from the object side of the object to the image side of the imaging surface along the optical axis, and each lens has at least one object side facing the object side and one image side facing the imaging surface side. Among them, there may be a spacing distance between any two adjacent lenses among the first lens to the seventh lens.

[0075] In an exemplary embodiment, the spacer element group may at least include a third spacer element disposed between the third lens and the fourth lens and at least partially in contact with the image side of the third lens, and a fourth spacer element disposed between the fourth lens and the fifth lens and at least partially in contact with the image side of the fourth lens.

[0076] The optical imaging device according to the exemplary embodiment of the present application can satisfy: 19.50 < D4s * V4 / f4 < 29.00; and 10 < f4 / (EP34 + CT4) < 18. Where D4s is the outer diameter of the object side of the fourth spacer element, V4 is the Abbe number of the fourth lens, f4 is the effective focal length of the fourth lens, EP34 is the distance along the optical axis from the image side of the third spacer element to the object side of the fourth spacer element, and CT4 is the central thickness of the fourth lens on the optical axis. By satisfying the conditional formula 19.50 < D4s * V4 / f4 < 29.00, according to design experience, the object side shape of the fourth lens tends to be flat, and the image side tends to be spherical, which is beneficial to correcting the spherical aberration and chromatic aberration brought by the first three lenses, but at the same time will cause the sensitivity of the third lens to become worse; by satisfying the conditional formula 10 < f4 / (EP34 + CT4) < 18, by adjusting the distance between the third lens and the fourth lens, the central thickness of the fourth lens, and the focal length value, the deflection angle of the system light can be effectively reduced, and the lens sensitivity of the third lens can be reduced.

[0077] According to the optical imaging device provided by the exemplary embodiment of the present application, the spacer element group may further include at least one of the following: a second spacer element disposed between the second lens and the third lens and at least partially contacting the image side surface of the second lens; a fourth auxiliary spacer element disposed between the fourth lens and the fifth lens and at least partially contacting the fourth spacer element, etc. By arranging spacer elements and auxiliary spacer elements between different lenses of the lens group, and through the cooperation between the spacer elements, lenses, and lens barrel, not only can the assembly stability of the lens group be improved, but also the risk of stray light can be effectively avoided, the interference to the image quality can be reduced, and thus the imaging quality of the optical imaging device can be enhanced.

[0078] It should be understood that the present application does not specifically limit the number of spacer elements. Any number of spacer elements can be included between any two lenses, and the entire optical imaging device can also include any number of spacer elements. The spacer elements help the optical imaging device intercept redundant refraction and reflection optical paths, reducing the generation of stray light and ghost images. Adding auxiliary supports between the spacer elements and the lens barrel is beneficial to improving problems such as poor assembly stability and low performance yield caused by large step differences between lenses.

[0079] In some embodiments, the optical imaging device according to the present application may further include a filter and / or a protective glass disposed between the sixth lens and the imaging surface, for filtering light rays with different wavelengths, correcting color deviation, and protecting the photosensitive element located on the imaging surface.

[0080] In some embodiments, the optical imaging device according to the present application may further include a diaphragm disposed between the object side and the first lens. The setting of the diaphragm is beneficial to effectively converge the light rays entering the optical lens and is beneficial to reducing the aperture of the lens.

[0081] In the exemplary embodiment, the optical imaging device according to the present application may satisfy: 0.30 < d0s / f12 < 0.45, where d0s is the inner diameter of the object side end face of the lens barrel, and f12 is the combined focal length of the first lens and the second lens. Meeting this condition can block the crab-leg stray light generated due to poor molding of the first lens by controlling the inner diameter of the plane of the object side surface of the lens barrel perpendicular to the optical axis, improving the imaging quality of the optical system; at the same time, by controlling the numerical range of the combined focal length of the first lens and the second lens, the contribution range of the optical power can be reasonably controlled, and the contribution rate of its negative spherical aberration can be reasonably controlled, so as to reasonably balance the positive optical power of the first lens.

[0082] In an exemplary embodiment, the optical imaging device according to the present application may satisfy: 12 < (D5s - d5s) / (CT5 - T56) < 20, where D5s is the outer diameter of the object side surface of the fifth spacer element, d5s is the inner diameter of the object side surface of the fifth spacer element, CT5 is the central thickness of the fifth lens on the optical axis, and T56 is the air gap between the fifth lens and the sixth lens on the optical axis. Meeting this condition, by controlling the difference between the outer diameter and the inner diameter of the object side surface of the fifth spacer element and the difference between the central thickness of the fifth lens and the air gap between the fifth lens and the sixth lens on the optical axis, the central thickness of the fifth lens and the air gap between the fifth lens and the sixth lens on the optical axis can be reasonably controlled, effectively improving the structural strength of the fifth lens and the yield rate; at the same time, by controlling the difference between the outer diameter and the inner diameter of the object side surface of the fifth spacer element, the height of the light entering the sixth lens and the outer diameter of the sixth lens can also be controlled, which helps to reduce the assembly step difference between the fifth lens and the sixth lens and improve the assembly yield rate.

[0083] In an exemplary embodiment, the optical imaging device according to the present application may satisfy: 1.60 < EP45 / CT5 < 3.10, where EP45 is the distance along the optical axis from the image side surface of the fourth spacer element to the object side surface of the fifth spacer element, and CT5 is the central thickness of the fifth lens on the optical axis. Meeting this condition, by controlling the interval distance between the image side surface of the fourth spacer element and the object side surface of the fifth spacer element along the optical axis, the light deflection angle can be controlled, the sensitivity of the fifth lens can be reduced, and the yield rate of the optical system can be improved; at the same time, by controlling the central thickness of the fifth lens, the good formability of the fifth lens can also be ensured.

[0084] In an exemplary embodiment, the optical imaging device according to the present application may satisfy: 1.20 < d0s / d2s*(f12 / f) < 2.0, where d0s is the inner diameter of the object side end surface of the lens barrel, d2s is the inner diameter of the object side surface of the second spacer element, f12 is the combined focal length of the first lens and the second lens, and f is the total effective focal length of the optical imaging device. Meeting this condition, by controlling the product of the ratio between the inner diameter of the object side end surface of the lens barrel and the inner diameter of the object side surface of the second spacer element and the ratio between the combined focal length of the first lens and the second lens and the total focal length, on the one hand, the ratio between the combined focal length of the first lens and the second lens and the total focal length can be controlled, which helps to reduce the tolerance sensitivity between the first lens and the second lens and improve the yield rate; on the other hand, by controlling the ratio between the inner diameter of the object side end surface of the lens barrel and the inner diameter of the object side surface of the second spacer element, it helps to block the stray light generated at the edge of the effective diameter of the first lens and improve the imaging quality.

[0085] In an exemplary embodiment, the optical imaging device according to the present application may satisfy: 0.50 < (D0m - d6s) / f6 < 0.80, where D0m is the outer diameter of the image-side end face of the lens barrel, d6s is the inner diameter of the object-side face of the sixth spacer element, and f6 is the effective focal length of the sixth lens. By satisfying this condition, by controlling the ratio between the difference in the outer diameter of the plane perpendicular to the optical axis of the image-side face of the lens barrel and the inner diameter of the plane perpendicular to the optical axis of the object-side face of the sixth spacer element and the effective focal length of the sixth lens, the effective focal length of the sixth lens can be reasonably controlled, thereby reducing the deflection angle of light; at the same time, by controlling the inner diameter of the spacer ring and the diameter of the image-side end face of the lens barrel, it is possible to prevent light from directly hitting the lens barrel and the inner diameter surface of the spacer ring to generate primary stray light.

[0086] In an exemplary embodiment, the optical imaging device according to the present application may satisfy: 3.60 < EP02 / |SAGH22| < 5.80, where EP02 is the distance along the optical axis from the object-side end face of the lens barrel to the object-side face of the second spacer element, and SAGH22 is the axial distance between the intersection of the image-side face of the second lens and the optical axis and the bearing end of the second spacer element on the image-side face of the second lens. By satisfying this condition, it helps to improve the processability of the first two lenses, improve the problem of low yield caused by poor molding, and at the same time helps to reasonably distribute the optical power and improve the imaging quality.

[0087] In an exemplary embodiment, the optical imaging device according to the present application may satisfy: 2.60 < (T67 + EP56) / |SAGH62| < 3.40, where T67 is the air gap between the sixth lens and the seventh lens on the optical axis, EP56 is the distance along the optical axis from the image-side face of the fifth spacer element to the object-side face of the sixth spacer element, and SAGH62 is the axial distance between the intersection of the image-side face of the sixth lens and the optical axis and the bearing end of the sixth spacer element on the image-side face of the sixth lens. By satisfying this condition, by controlling the distance between the fifth spacer element and the object-side face of the sixth spacer element along the optical axis and the sagitta of the object-side face of the sixth lens within a reasonable range, it helps to ensure the uniform molding of the sixth lens, ensure good processability of the sixth lens, and improve the quality of the lens.

[0088] In an exemplary embodiment, the optical imaging device according to the present application may satisfy: 26 < d2s*V1 / f1 < 28, where d2s is the inner diameter of the object-side face of the second spacer element, V1 is the Abbe number of the first lens, and f1 is the effective focal length of the first lens. By satisfying this condition, by controlling the light-blocking aperture of the second spacer element, the Abbe number of the first lens, and the effective focal length of the first lens, the coma of the optical system can be effectively balanced and the imaging quality can be improved.

[0089] In an exemplary embodiment, the optical imaging device according to the present application may satisfy: 0.50 < (R5 - R6) / D3s < 1.30, where R5 is the radius of curvature of the object side surface of the third lens, R6 is the radius of curvature of the image side surface of the third lens, and D3s is the outer diameter of the object side surface of the third spacer element. By satisfying this condition, by defining the ratio of the difference between the radius of curvature of the object side surface and the radius of curvature of the image side surface of the third lens to the outer diameter of the third spacer element, the step difference between the aspherical surfaces of the third lens and the distance between the fitting position of the third spacer element and the aspherical surface can be well controlled, which is beneficial to ensuring good processability of the third lens.

[0090] In an exemplary embodiment, the spacer element group further includes a fourth auxiliary spacer element disposed between the image side surface of the fourth lens and the object side surface of the fifth lens. The optical imaging device according to the present application may satisfy: -40 < D4bm*V4 / R8 < -22, where D4bm is the outer diameter of the object side surface of the fourth auxiliary spacer element, V4 is the Abbe number of the fourth lens, and R8 is the radius of curvature of the image side surface of the fourth lens. By satisfying this condition, by controlling the ratio of the outer diameter of the fourth auxiliary spacer element to the Abbe number of the fourth lens and the radius of curvature of the image side surface of the fourth lens, it helps to control the trend of the thickness-to-thickness ratio and the outer diameter-to-middle thickness ratio of the fourth lens, thereby ensuring good processability of the fourth lens.

[0091] In an exemplary embodiment, the optical imaging device according to the present application may satisfy: 0.70 < (D5s - D4s) / (d5s - d3s) < 1.45, where D5s is the outer diameter of the object side surface of the fifth spacer element, d5s is the inner diameter of the object side surface of the fifth spacer element, D4s is the outer diameter of the object side surface of the fourth spacer element, and d3s is the inner diameter of the object side surface of the third spacer element. By satisfying this condition, by controlling the relationship between the inner and outer diameters of the fifth spacer element and the fourth and third spacer elements, the stray light reflected back to the structure area of the object side surface of the fifth lens by the color filter can be effectively blocked, improving the imaging quality of the optical system.

[0092] In an exemplary embodiment, the optical imaging device according to the present application may satisfy: 2.0 < (EP34 + EP45) / T23 < 3.10, where EP34 is the distance along the optical axis from the image side of the third spacer element to the object side of the fourth spacer element, EP45 is the distance along the optical axis from the image side of the fourth spacer element to the object side of the fifth spacer element, and T23 is the air gap between the second lens and the third lens on the optical axis. By satisfying this condition, the optical power can be constrained and reasonably distributed, improving the upper limit of the performance of the optical system; at the same time, by controlling the distance between the fourth spacer element and the fifth spacer element, it helps to ensure both the wall thickness of the fourth auxiliary spacer element and the structural strength of the fifth lens, thereby enhancing the uniformity of the spacer elements and the structural strength of the overall lens; in addition, through the auxiliary support of the fifth lens, the assembly stability can be effectively improved, and the imaging quality of the lens can be enhanced.

[0093] In an exemplary embodiment, the optical imaging device according to the present application may satisfy: 1.50 < R10 / R11 < 2.00; and (D6s - d5s) / (EP45 - T56) < 6.0, where R10 is the radius of curvature of the image side of the fifth lens, R11 is the radius of curvature of the object side of the sixth lens, D6s is the outer diameter of the object side of the sixth spacer element, d5s is the inner diameter of the object side of the fifth spacer element, EP45 is the distance along the optical axis from the image side of the fourth spacer element to the object side of the fifth spacer element, and T56 is the air gap between the fifth lens and the sixth lens on the optical axis. By satisfying this condition, by controlling the ratio of the radius of curvature between the object side of the sixth lens and the image side of the fifth lens, the projection height of the light rays on the sixth lens can be regulated, thereby controlling the aperture of the last surface. However, at the same time, it will also cause too large a deflection angle of the light rays between the fifth lens and the sixth lens, making the fifth lens more sensitive; and by controlling the inner and outer diameters of the sixth spacer element and the fifth spacer element and the distance between the image side of the fourth spacer element and the object side of the fifth spacer element along the optical axis direction, the deflection angle of the light rays can be effectively reduced, and the sensitivity of the optical system can be lowered.

[0094] In an exemplary embodiment, for the optical imaging device according to the present application, the spacer element group further includes a second spacer element disposed on the image side of the second lens and at least partially in contact with the third lens, and the inner diameter of the object side of the second spacer element is the minimum among the inner diameters of the object sides of all the spacer elements in the spacer element group. By controlling the inner diameter of the second spacer element, it is beneficial to control the light ray angle of the marginal field of view within a reasonable range, effectively reducing the sensitivity of the system, improving the yield, and also being beneficial to correcting the system aberration.

[0095] In an exemplary embodiment, the lens barrel may include a first lens barrel and a second lens barrel, wherein the first lens may be accommodated in the first lens barrel, and the first lens may be fixedly connected to the first lens barrel by dispensing, and the second lens to the seventh lens may be accommodated in the second lens barrel.

[0096] According to the optical imaging device of the above embodiment of the present application, its lens group can use multiple lenses, such as the seven lenses described above. By reasonably allocating the focal length, surface shape, center thickness of each lens, and axial spacing between lenses, etc., the incident light can be effectively converged, the total optical length can be reduced, and the processability can be improved, making the optical imaging device more conducive to production and processing.

[0097] In an embodiment of the present application, at least one of the mirror surfaces of each lens in the first lens to the seventh lens is an aspherical mirror surface. The characteristic of an aspherical lens is that the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting an aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, the object side surface and the image side surface of each lens in the first lens to the seventh lens are aspherical mirror surfaces.

[0098] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the optical imaging device can be changed to obtain the various results and advantages described in this specification. For example, although seven lenses are described as an example in the embodiments, the optical imaging device is not limited to including seven lenses. If necessary, the optical imaging device may also include other numbers of lenses.

[0099] Embodiments 1 to 6 of the optical imaging device applicable to the above exemplary embodiment will be further described below with reference to the accompanying drawings.

[0100] Example 1

[0101] The following reference Figure 5 The following is a schematic diagram of the structure of an optical imaging device according to Embodiment 1 of the present application. Figure 5 As shown, the optical imaging device may include a lens barrel and a lens group and a spacer element group accommodated in the lens barrel.

[0102] The lens group includes, from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and a seventh lens E7.

[0103] The spacer element group includes, from the object side to the image side, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fourth auxiliary spacer element P4b, a fifth spacer element P5 and a sixth spacer element P6. The spacer elements can block stray light from entering the next lens during the imaging process, and at the same time make the lens and the lens barrel better supported, thereby enhancing the structural stability of the optical imaging device.

[0104] In this embodiment, the first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has negative focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The sixth lens E6 has positive focal power, and its object side surface S11 is convex, and its image side surface S12 is concave. The seventh lens E7 has negative focal power, and its object side surface S13 is convex, and its image side surface S14 is concave. The light from the object passes through each surface S1 to S14 in sequence and is finally imaged on the imaging surface.

[0105] Table 1 shows a basic parameter table of the optical imaging device of Example 1, wherein the units of the radius of curvature, thickness / distance and focal length are all millimeters (mm).

[0106]

[0107]

[0108] Table 1

[0109] In Example 1, the object side surface and the image side surface of any lens among the first lens E1 to the seventh lens E7 are both aspherical surfaces, and the surface shape x of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0110]

[0111] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. The following Tables 2 and 3 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, A76, A77, A8, A9, A10, A11, A12, A13, A14, A15 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A22 , A 24 , A 26 , A 28 and A 30 .

[0112] Face number A4 A6 A8 A10 A12 A14 A16 S1 -2.0271E-02 -1.0759E-02 -4.3940E-03 -1.5298E-03 -7.2145E-04 -3.4881E-04 -1.9382E-04 S2 -9.5728E-02 1.4586E-02 -8.4605E-03 -3.6489E-04 -1.3120E-03 -1.0959E-04 -7.4265E-05 S3 -5.4875E-02 4.8834E-02 -2.6199E-03 1.7209E-03 -9.2303E-04 -9.9693E-05 -1.0271E-04 S4 -1.8863E-02 2.2609E-02 1.3608E-03 1.8429E-03 2.4626E-04 1.4539E-04 5.4337E-05 S5 -3.0974E-01 -1.3204E-02 2.9550E-03 2.0277E-03 2.5677E-04 8.5457E-06 -6.0403E-07 S6 -3.4848E-01 8.6730E-03 8.1507E-03 8.7263E-04 4.5609E-05 2.2232E-05 -8.2958E-06 S7 -1.3426E-01 2.9415E-02 5.0415E-03 2.8459E-04 2.3496E-03 3.7779E-04 -3.5578E-04 S8 -2.7481E-01 1.7305E-02 8.6091E-03 4.7055E-03 6.1872E-03 2.8987E-03 9.7042E-04 S9 -8.6628E-01 6.5612E-03 5.0733E-02 1.9202E-02 2.5507E-03 -1.6969E-03 -4.9265E-03 S10 -2.6258E+00 6.0276E-01 -8.1031E-02 2.0581E-03 -2.8399E-02 1.5637E-02 -1.9302E-03 S11 -4.7397E+00 8.6524E-01 4.8013E-02 -2.3275E-02 -7.2038E-02 3.4187E-02 4.5100E-03 S12 -1.5345E+00 -3.5783E-02 1.4854E-01 8.9512E-03 -4.1658E-03 -1.3427E-02 7.4701E-03 S13 -3.4750E+00 1.5156E+00 -7.3918E-01 3.5879E-01 -1.8101E-01 5.3490E-02 8.6777E-03 S14 -8.8019E+00 2.1594E+00 -7.3663E-01 2.9860E-01 -1.5761E-01 5.8305E-02 -3.2017E-02

[0113] Table 2

[0114]

[0115]

[0116] Table 3

[0117] Fig. 8A The axial chromatic aberration curve of the optical imaging device of Example 1 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 8B The astigmatism curve of the optical imaging device of Example 1 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 8C The distortion curve of the optical imaging device of Example 1 is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. FIG. 8A to FIG. 8C It can be seen that the optical imaging device provided in Example 1 can achieve good imaging quality.

[0118] Example 2

[0119] Figure 6 A schematic structural diagram of an optical imaging device according to Embodiment 2 of the present application is shown. In this embodiment and the following Embodiment 3, for the sake of brevity, some descriptions similar to Embodiment 1 will be omitted.

[0120] like Figure 6 As shown, the optical imaging device of this embodiment includes a lens barrel and a lens group and a spacer element group contained in the lens barrel. The lens group includes, from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and a seventh lens E7. The spacer element group includes, from the object side to the image side, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fourth auxiliary spacer element P4b, a fifth spacer element P5 and a sixth spacer element P6.

[0121] The parameters such as the curvature radius, center thickness, etc. of the first lens to the seventh lens of the optical imaging device of this embodiment and Example 1, as well as the spacing distances between the lenses and the high-order image coefficients are the same, as shown in Table 1, Table 2 and Table 3. In addition, the spacing elements included in the spacing element group of the optical imaging device of this embodiment and Example 1 are also the same, and the only difference is that at least one of the parameters such as the lens barrel, the thickness of the spacing element, the inner diameter of the spacing element, the outer diameter of the spacing element, and the distance between the spacing elements is different. In other words, the main structure for imaging is the same, while the auxiliary structure for imaging is different. Therefore, the imaging quality of the optical imaging device of this embodiment is as follows: FIG. 8A to FIG. 8C shown.

[0122] Example 3

[0123] Figure 7 A schematic structural diagram of an optical imaging device according to Example 3 of the present application is shown.

[0124] like Figure 7 As shown, the optical imaging device of this embodiment includes a lens barrel and a lens group and a spacer element group contained in the lens barrel. The lens group includes, from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and a seventh lens E7. The spacer element group includes, from the object side to the image side, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fourth auxiliary spacer element P4b, a fifth spacer element P5 and a sixth spacer element P6.

[0125] The parameters such as the curvature radius, center thickness, etc. of the first lens to the seventh lens of the optical imaging device of this embodiment and Example 1, as well as the spacing distances between the lenses and the high-order image coefficients are the same, as shown in Table 1, Table 2 and Table 3. In addition, the spacing elements included in the spacing element group of the optical imaging device of this embodiment and Example 1 are also the same, and the only difference is that at least one of the parameters such as the lens barrel, the thickness of the spacing element, the inner diameter of the spacing element, the outer diameter of the spacing element, and the distance between the spacing elements is different. In other words, the main structure for imaging is the same, while the auxiliary structure for imaging is different. Therefore, the imaging quality of the optical imaging device of this embodiment is as follows: FIG. 8A to FIG. 8C shown.

[0126] Example 4

[0127] The following reference Fig. 9 The following is a schematic diagram of the structure of an optical imaging device according to Embodiment 4 of the present application. Fig. 9 As shown, the optical imaging device may include a lens barrel and a lens group and a spacer element group accommodated in the lens barrel.

[0128] The lens group includes, from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and a seventh lens E7.

[0129] The spacer element group includes, from the object side to the image side, a second spacer element P2 , a third spacer element P3 , a fourth spacer element P4 , a fourth auxiliary spacer element P4 b , a fifth spacer element P5 and a sixth spacer element P6 .

[0130] In this embodiment, the first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has negative focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The sixth lens E6 has positive focal power, and its object side surface S11 is convex, and its image side surface S12 is concave. The seventh lens E7 has negative focal power, and its object side surface S13 is convex, and its image side surface S14 is concave. The light from the object passes through each surface S1 to S14 in sequence and is finally imaged on the imaging surface.

[0131] Table 4 shows a basic parameter table of the optical imaging device of Example 4, wherein the units of the radius of curvature, thickness / distance and focal length are all millimeters (mm).

[0132]

[0133] Table 4

[0134] In Example 4, the object side surface and the image side surface of any lens among the first lens E1 to the seventh lens E7 are aspherical surfaces, and the surface shape x of each aspherical lens can be defined by the aspherical surface formula (1) in Example 1 but is not limited thereto.

[0135] Tables 5 and 6 below 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, A61, A62, A63, A64, A71, A72, A73, 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0136] Face number A4 A6 A8 A10 A12 A14 A16 S1 -2.2788E-02 -1.4987E-02 -6.0126E-03 -1.6906E-03 -3.9852E-04 -5.4201E-05 -2.0035E-05 S2 -1.1975E-01 1.2543E-02 -5.7463E-03 4.8263E-08 -2.3411E-04 -3.5218E-05 9.1860E-06 S3 -1.4104E-02 5.3223E-02 -9.8834E-04 2.0598E-03 -1.3210E-05 3.2283E-07 1.7325E-06 S4 2.9029E-02 2.6012E-02 5.9204E-04 1.3251E-03 2.0323E-04 4.7432E-05 2.1584E-05 S5 -2.7552E-01 -1.5125E-02 1.5629E-03 1.7271E-03 1.2312E-04 -1.6637E-05 -3.8592E-05 S6 -3.5650E-01 1.8494E-02 1.5901E-02 3.9677E-03 -7.6693E-04 -1.8489E-04 2.0608E-04 S7 -2.3268E-01 3.9333E-02 1.0874E-02 1.5423E-03 5.2016E-04 5.7855E-04 6.5550E-05 S8 -4.2940E-01 2.0142E-02 8.6107E-03 6.4314E-03 7.6841E-03 4.0587E-03 1.5209E-03 S9 -1.3723E+00 5.3285E-02 3.8998E-02 2.8557E-02 8.6294E-03 -4.7968E-04 -1.0667E-02 S10 -3.3537E+00 5.9956E-01 -1.7417E-01 -4.8357E-03 -1.0265E-02 1.2533E-02 -1.1884E-02 S11 -4.7810E+00 9.1456E-01 3.5731E-02 -9.5144E-02 -1.5010E-02 3.9746E-02 -1.3668E-02 S12 -1.3789E+00 -2.2311E-01 2.0468E-01 -3.9333E-02 1.7053E-02 -1.3222E-02 5.6164E-03 S13 -4.1965E+00 1.6116E+00 -7.3228E-01 3.4269E-01 -1.6830E-01 4.6787E-02 1.4619E-02 S14 -9.0244E+00 2.1857E+00 -6.2957E-01 2.6928E-01 -1.3649E-01 4.8716E-02 -2.3984E-02

[0137] Table 5

[0138] Face number A18 A20 A22 A24 A26 A28 A30 S1 -8.2103E-05 -4.6897E-05 -1.7715E-05 -9.8493E-06 4.5079E-07 -4.4444E-07 -1.5848E-06 S2 -1.0543E-05 -1.5817E-06 -3.0872E-06 2.6895E-06 1.1512E-06 4.6339E-06 1.9342E-06 S3 -4.8091E-05 -1.5117E-05 -7.0980E-06 1.7348E-06 7.4223E-07 2.0134E-07 -9.4814E-07 S4 8.6177E-06 3.4142E-06 -1.0137E-06 2.4523E-06 -1.1328E-06 -6.2265E-07 -1.7782E-06 S5 1.0679E-05 -5.6938E-07 5.9449E-06 -1.9766E-06 2.8825E-06 -4.6292E-06 7.7710E-07 S6 -1.0536E-04 -2.0712E-05 6.0572E-06 -9.0527E-06 2.6344E-06 -1.8049E-06 2.6882E-08 S7 -2.7011E-04 -9.0082E-06 2.8141E-06 -1.3186E-05 1.9003E-05 4.6284E-06 9.3094E-07 S8 1.1322E-04 -6.2093E-05 -1.4352E-04 -9.4812E-05 -7.1189E-05 -2.5929E-05 -1.8233E-05 S9 -1.2559E-03 6.0126E-04 8.6326E-04 3.8966E-04 -1.7023E-05 -1.0068E-04 -8.3748E-05 S10 1.8351E-03 -1.7558E-03 3.9112E-05 1.7478E-04 3.1616E-04 -4.2351E-05 -9.4483E-05 S11 -2.9994E-03 -4.4006E-03 2.2952E-03 8.2884E-05 -2.2880E-04 -1.7005E-04 9.5529E-05 S12 4.4657E-04 -3.4260E-03 -4.6496E-03 -3.6007E-05 1.6413E-03 6.6784E-04 -1.7066E-04 S13 -1.5993E-02 -3.3767E-05 6.6273E-03 -3.1489E-03 -1.1896E-04 8.8487E-04 -1.1533E-04 S14 1.4797E-02 -3.6989E-03 3.8790E-03 -4.0084E-03 1.0254E-03 1.9619E-04 6.1949E-04

[0139] Table 6

[0140] Fig. 12A The axial chromatic aberration curve of the optical imaging device of Example 4 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Fig. 12B The astigmatism curve of the optical imaging device of Example 4 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Fig. 12C The distortion curve of the optical imaging device of Example 4 is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. FIG. 12A to FIG. 12C It can be seen that the optical imaging device provided in Example 4 can achieve good imaging quality.

[0141] Example 5

[0142] Fig.10 The schematic diagram of the structure of the optical imaging device according to Embodiment 5 of the present application is shown. In this embodiment and the following Embodiment 6, for the sake of brevity, some descriptions similar to Embodiment 4 will be omitted.

[0143] like Fig.10 As shown, the optical imaging device of this embodiment includes a lens barrel and a lens group and a spacer element group contained in the lens barrel. The lens group includes, from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and a seventh lens E7. The spacer element group includes, from the object side to the image side, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fourth auxiliary spacer element P4b, a fifth spacer element P5 and a sixth spacer element P6.

[0144] The parameters such as the curvature radius, center thickness, etc. of the first to seventh lenses of the optical imaging devices of this embodiment and embodiment 4, as well as the spacing distances between lenses and high-order image coefficients are the same, as shown in Table 4, Table 5 and Table 6. In addition, the spacing elements included in the spacing element group of the optical imaging devices of this embodiment and embodiment 4 are also the same, and the only difference is that at least one of the parameters such as the lens barrel, the thickness of the spacing elements, the inner diameter of the spacing elements, the outer diameter of the spacing elements, and the distance between the spacing elements is different. In other words, the main structure for imaging is the same, while the auxiliary structure for imaging is different. Therefore, the imaging quality of the optical imaging device of this embodiment is as follows: FIG. 12A to FIG. 12C shown.

[0145] Example 6

[0146] Fig.11A schematic structural diagram of an optical imaging device according to Example 6 of the present application is shown.

[0147] like Fig.11 As shown, the optical imaging device of this embodiment includes a lens barrel and a lens group and a spacer element group contained in the lens barrel. The lens group includes, from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and a seventh lens E7. The spacer element group includes, from the object side to the image side, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fourth auxiliary spacer element P4b, a fifth spacer element P5 and a sixth spacer element P6.

[0148] The parameters such as the curvature radius, center thickness, etc. of the first to seventh lenses of the optical imaging devices of this embodiment and embodiment 4, as well as the spacing distances between lenses and high-order image coefficients are the same, as shown in Table 4, Table 5 and Table 6. In addition, the spacing elements included in the spacing element group of the optical imaging devices of this embodiment and embodiment 4 are also the same, and the only difference is that at least one of the parameters such as the lens barrel, the thickness of the spacing elements, the inner diameter of the spacing elements, the outer diameter of the spacing elements, and the distance between the spacing elements is different. In other words, the main structure for imaging is the same, while the auxiliary structure for imaging is different. Therefore, the imaging quality of the optical imaging device of this embodiment is as follows: FIG. 12A to FIG. 12C shown.

[0149] Table 7 below shows the effective focal length of the optical imaging device of Examples 1 to 6, the focal length value of each lens, the maximum field of view FOV, and the aperture number FNO and other parameter values, wherein the unit of the focal length value is millimeter (mm).

[0150] Parameter value / example 1 2 3 4 5 6 f1(mm) 7.71 7.71 7.71 7.54 7.54 7.54 f2(mm) -23.48 -23.48 -23.48 -23.41 -23.41 -23.41 f3(mm) -31.27 -31.27 -31.27 -33.09 -33.09 -33.09 f4(mm) 14.81 14.81 14.81 20.77 20.77 20.77 f5(mm) -8.88 -8.88 -8.88 -13.66 -13.66 -13.66 f6(mm) 4.64 4.64 4.64 5.38 5.38 5.38 f7(mm) -5.67 -5.67 -5.67 -5.99 -5.99 -5.99 f(mm) 6.68 6.68 6.68 6.79 6.79 6.79 FOV(°) 86.40 86.40 86.40 87.30 87.30 87.30 f12(mm) 10.41 10.41 10.41 10.05 10.05 10.05 FNO 1.50 1.50 1.50 2.00 2.00 2.00

[0151] Table 7

[0152] Table 8 below shows some basic parameters of the lens barrel and spacing elements of the optical imaging device according to Embodiments 1 to 6 of the present application, such as d2s, d3s, D4s, d5s, D5s, d6s, D6s, d0s, D0m, D4bm, EP02, EP34, EP45, EP56, |SAGH22| and |SAGH62|. The structural dimensions of the lens barrel and spacing elements of the optical imaging device of each embodiment are different. Some of the basic parameters listed in Table 8 are as follows: Figure 1 The units of the basic parameters listed in Table 8 are all millimeters (mm).

[0153] Parameter value / example 1 2 3 4 5 6 d2s 3.68 3.61 3.68 3.64 3.59 3.68 d3s 4.21 4.30 4.21 4.24 4.14 4.40 D3s 5.061 5.261 6.072 5.152 5.352 6.955 D4s 6.54 6.74 7.61 7.24 7.90 8.41 d5s 7.49 7.65 7.38 8.12 7.89 7.75 D5s 11.09 11.23 11.39 11.00 11.54 11.22 d6s 9.61 9.31 10.24 9.63 10.19 9.43 D6s 10.99 11.54 11.36 11.21 11.11 10.65 d0s 4.52 4.26 4.62 3.43 3.72 3.41 D0m 12.89 12.99 13.19 13.11 12.97 13.10 EP02 1.73 1.73 1.76 2.14 2.14 2.19 EP34 0.50 0.50 0.46 0.47 0.42 0.41 EP45 1.28 1.32 1.29 1.34 0.90 1.29 EP56 0.71 0.66 0.77 0.56 0.90 0.58 D4b 6.54 6.74 7.61 7.24 7.90 7.98 |SAGH22| 0.41 0.41 0.44 0.37 0.37 0.42 |SAGH62| 0.63 0.63 0.60 0.57 0.64 0.65

[0154] Table 8 In summary, the optical imaging devices in Examples 1 to 6 respectively meet the conditions in the following Table 9.

[0155]

[0156]

[0157] Table 9

[0158] 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 the utility model 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 utility model. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) by each other to form a technical solution.

Claims

1. An optical imaging device, characterized in that: The lens barrel comprises a lens group and a spacer element group, wherein the lens group and the spacer element group are both accommodated in the lens barrel, wherein: The lens barrel comprises an outer annular surface and an inner annular surface, and the inner annular surface is in a stepped shape; The lens group includes: The first lens has positive refractive power, and its object side surface is convex and its image side surface is concave; The second lens has a negative optical power, and its object side surface is convex and its image side surface is concave; The third lens has a negative optical power, and its object side surface is convex and its image side surface is concave; a fourth lens element having positive refractive power, whose object-side surface is convex and whose image-side surface is convex; A fifth lens having negative optical power, whose object side surface is convex and image side surface is concave; a sixth lens element having positive refractive power, whose object-side surface is convex and whose image-side surface is concave; and The seventh lens element has a negative optical power, and its object side surface is convex and its image side surface is concave; The spacer element group comprises at least: a fourth spacer element, disposed on the image side surface of the fourth lens and at least partially in contact with the image side surface of the fourth lens; a fifth spacer element disposed on the image-side surface of the fifth lens and at least partially in contact with the image-side surface of the fifth lens; and a sixth spacer element, disposed on the image side surface of the sixth lens and at least partially in contact with the image side surface of the sixth lens; Wherein, the aperture number FNO of the optical imaging device satisfies: 1.5≤FNO≤2.0; The inner diameter d5s of the object side surface of the fifth spacer element, the outer diameter D5s of the object side surface of the fifth spacer element, and the outer diameter D6s of the object side surface of the sixth spacer element satisfy: 0.80<(D5s-d5s) / (D6s-d5s)<1.20; and The distance EP45 from the fourth spacer element to the fifth spacer element along the optical axis, the air gap T56 between the fifth lens and the sixth lens on the optical axis, and the center thickness CT5 of the fifth lens on the optical axis satisfy: 1.20<(EP45-T56) / CT5<2.

50.

2. The optical imaging device according to claim 1, wherein: The inner diameter d0s of the object side end surface of the lens barrel and the combined focal length f12 of the first lens and the second lens satisfy: 0.30 <d0s / f12<0.45。 3. The optical imaging device according to claim 1, wherein: The inner diameter d5s of the object side of the fifth spacer element, the outer diameter D5s of the object side of the fifth spacer element, the center thickness CT5 of the fifth lens, and the air gap T56 between the fifth lens and the sixth lens on the optical axis satisfy: 12<(D5s-d5s) / (CT5-T56)<20.

4. The optical imaging device according to claim 1, wherein: The distance EP45 from the image side surface of the fourth spacer element to the object side surface of the fifth spacer element along the optical axis and the center thickness CT5 of the fifth lens on the optical axis satisfy: 1.60 <EP45 / CT5<3.10。 5. The optical imaging device according to claim 1, wherein: The outer diameter D0m of the image side end surface of the lens barrel, the inner diameter d6s of the object side surface of the sixth spacer element, and the effective focal length f6 of the sixth lens satisfy: 0.50<(D0m-d6s) / f6<0.

80.

6. The optical imaging device according to claim 1, wherein: The spacer element group further includes a second spacer element disposed on the image side surface of the second lens and at least partially in contact with the image side surface of the second lens, The inner diameter d0s of the object side end surface of the lens barrel, the inner diameter d2s of the object side surface of the second spacer element, the combined focal length f12 of the first lens and the second lens, and the total effective focal length f of the optical imaging device satisfy: 1.20 <d0s / d2s*(f12 / f)<2.0。 7. The optical imaging device according to claim 1, wherein: The spacer element group further includes a second spacer element disposed on the image side surface of the second lens and at least partially in contact with the image side surface of the second lens, The distance EP02 from the object side end surface of the lens barrel to the object side surface of the second spacer element along the optical axis, and the axial distance SAGH22 from the intersection of the image side surface of the second lens and the optical axis to the end of the second spacer element supporting the image side surface of the second lens satisfy: 3.60 <EP02 / |SAGH22|<5.80。 8. The optical imaging device according to claim 1, wherein: The air gap T67 between the sixth lens and the seventh lens on the optical axis, the distance EP56 from the image side surface of the fifth spacer element to the object side surface of the sixth spacer element along the optical axis, and the on-axis distance SAGH62 from the intersection of the image side surface of the sixth lens and the optical axis to the supporting end of the sixth spacer element on the image side surface of the sixth lens satisfy: 2.60<(T67+EP56) / |SAGH62|<3.

40.

9. The optical imaging device according to claim 1, wherein: The spacer element group further includes a second spacer element disposed on the image side surface of the second lens and at least partially in contact with the image side surface of the second lens, The inner diameter d2s of the object side of the second spacer element, the Abbe number V1 of the first lens and the effective focal length f1 of the first lens satisfy: <d2s*V1 / f1<28。 10. The optical imaging device according to claim 1, wherein: The spacer element group further includes a third spacer element disposed on the image side surface of the third lens and at least partially in contact with the image side surface of the third lens, A curvature radius R5 of the object side surface of the third lens, a curvature radius R6 of the image side surface of the third lens, and an outer diameter D3s of the object side surface of the third spacer element satisfy: 0.50<(R5-R6) / D3s<1.

30.

11. The optical imaging device according to claim 1, wherein: The spacer element group further includes a fourth auxiliary spacer element disposed between the image side surface of the fourth lens and the object side surface of the fifth lens, The outer diameter D4bm of the object side surface of the fourth auxiliary spacer element, the Abbe number V4 of the fourth lens, and the curvature radius R8 of the image side surface of the fourth lens satisfy: -40 <D4bm*V4 / R8<-22。 12. The optical imaging device according to claim 1, wherein: The spacer element group further includes a third spacer element disposed on the image side surface of the third lens and at least partially in contact with the image side surface of the third lens, An outer diameter D5s of the object side surface of the fifth spacer element, an inner diameter d5s of the object side surface of the fifth spacer element, an outer diameter D4s of the object side surface of the fourth spacer element, and an inner diameter d3s of the object side surface of the third spacer element satisfy: 0.70<(D5s-D4s) / (d5s-d3s)<1.

45.

13. The optical imaging device according to any one of claims 1 to 12, wherein: The lens barrel includes a first lens barrel and a second lens barrel. The first lens is accommodated in the first lens barrel and is fixedly connected to the first lens barrel by dispensing glue; the second lens to the seventh lens are accommodated in the second lens barrel.

14. The optical imaging device according to any one of claims 1 to 6, wherein: The spacer element group further includes a third spacer element disposed on the image side of the third lens and at least partially in contact with the image side of the third lens. The distance EP34 along the optical axis from the image side of the third spacer element to the object side of the fourth spacer element, the distance EP45 along the optical axis from the image side of the fourth spacer element to the object side of the fifth spacer element, and the air gap T23 between the second lens and the third lens on the optical axis satisfy: 2.0 < (EP34 + EP45) / T23 < 3.

10.

15. The optical imaging device according to any one of claims 1 to 6, wherein: The radius of curvature R10 of the image side of the fifth lens and the radius of curvature R11 of the object side of the sixth lens satisfy: 1.50 < R10 / R11 < 2.00; and The outer diameter D6s of the object side of the sixth spacer element, the inner diameter d5s of the object side of the fifth spacer element, the distance EP45 along the optical axis from the image side of the fourth spacer element to the object side of the fifth spacer element, and the air gap T56 between the fifth lens and the sixth lens on the optical axis satisfy: 2.5 < (D6s - d5s) / (EP45 - T56) < 6.

0.

16. The optical imaging device according to any one of claims 1 to 6, wherein: The spacer element group further includes a second spacer element disposed on the image side of the second lens and at least partially in contact with the image side of the second lens. The inner diameter of the object side of the second spacer element is the minimum among the inner diameters of the object sides of all spacer elements in the spacer element group.

17. The optical imaging device according to any one of claims 1 to 6, wherein: The spacer element group further includes a third spacer element disposed on the image side of the third lens and at least partially in contact with the image side of the third lens. The outer diameter D4s of the object side of the fourth spacer element, the Abbe number V4 of the fourth lens, the effective focal length f4 of the fourth lens, the distance EP34 along the optical axis from the image side of the third spacer element to the object side of the fourth spacer element, and the central thickness CT4 of the fourth lens on the optical axis satisfy: 19.50 < D4s*V4 / f4 < 29.00; and 10 < f4 / (EP34 + CT4) < 18.

18. An optical imaging device, characterized in that: It includes a lens barrel, a lens group, and a spacer element group. The lens group and the spacer element group are both accommodated in the lens barrel, where The lens barrel includes an outer ring surface and an inner ring surface, and the inner ring surface is stepped. The lens group includes, arranged in sequence from the object side to the image side along the optical axis: A first lens with a positive optical power, whose object side is convex and image side is concave. A second lens with a negative optical power, whose object side is convex and image side is concave. A third lens with a negative optical power, whose object side is convex and image side is concave. A fourth lens with a positive optical power, whose object side is convex and image side is convex. A fifth lens with a negative optical power, whose object side is convex and image side is concave. A sixth lens with a positive optical power, having a convex object side and a concave image side; and A seventh lens with a negative optical power, having a convex object side and a concave image side; The spacer element group at least includes: A third spacer element disposed on the image side of the third lens and at least partially in contact with the image side of the third lens; and A fourth spacer element disposed on the image side of the fourth lens and at least partially in contact with the image side of the fourth lens; Wherein, the outer diameter D4s of the object side of the fourth spacer element, the Abbe number V4 of the fourth lens, the effective focal length f4 of the fourth lens, the distance EP34 along the optical axis direction from the image side of the third spacer element to the object side of the fourth spacer element, and the central thickness CT4 of the fourth lens on the optical axis satisfy: 19.50 < D4s * V4 / f4 < 29.00; and 10 < f4 / (EP34 + CT4) < 18.

Images