Optical imaging device

Abstract

An optical imaging device disclosed by the present application comprises a lens barrel, and a lens group and a spacing element group which are arranged in the lens barrel, the lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens, the first lens, the fourth lens and the fifth lens all have positive focal power, and the sixth lens has negative focal power. The second lens, the third lens, the sixth lens, the seventh lens and the eighth lens all have negative focal power; the spacing element group comprises a sixth spacing element and a seventh spacing element; the optical imaging device satisfies 1.8 lt; f8 / flt; , 2.8,-2.10 lt,-2.10 lt; f8 / (R15 + R16) lt; -1.15 and 0.9 lt,-1.15 and 0.9 lt; (EP67 + CP7) / T78lt; f8 is the effective focal length of the eighth lens, f is the effective focal length of the optical imaging device, R15 is the curvature radius of the object side surface of the eighth lens, R16 is the curvature radius of the image side surface of the eighth lens, EP67 is the spacing distance between the image side surface of the sixth spacing element and the object side surface of the seventh spacing element along the optical axis direction, CP7 is the thickness of the seventh spacing element along the optical axis direction, and R16 is the thickness of the seventh spacing element along the optical axis direction. And T78 is an air interval between the seventh lens and the eighth lens on the optical axis.

Description

Technical Field

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

[0002] With the development needs of the intelligence and lightweight of current consumer electronics, people have higher and higher requirements for the imaging quality of the lenses of smart phones, and at the same time, higher requirements are put forward for the volume and weight of the lenses. On the one hand, although the number of lenses in the imaging device increases, greatly improving the resolution of the imaging device, the increase in the number of lenses also increases the instability of the cooperation between the lenses and the lens barrel. At the same time, miniaturization limits the structural space of the lens, bringing challenges to the reliability after assembly; on the other hand, currently, imaging devices such as lenses and lens barrels are made of resin materials, and their characteristics are prominent in hygroscopicity in high-temperature and high-humidity environments. An unstable structural design will seriously affect the imaging quality. Therefore, in terms of the inner and outer diameter dimensions of the spacer element and the bearing design between the lens and the lens barrel, designers need to focus on consideration to ensure the reliability of the lens after assembly in the face of environments such as high temperature and high humidity. Summary of the Utility Model

[0003] In a first aspect of this application, there is provided such an optical imaging device, which includes: a lens barrel, and a lens group and a spacer element group disposed in the lens barrel. Among them, the lens group sequentially includes, from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. Among them, the first lens, the fourth lens, and the fifth lens all have positive optical powers, and the second lens, the third lens, the sixth lens, the seventh lens, and the eighth lens all have negative optical powers; the spacer element group includes: a sixth spacer element and a seventh spacer element. Among them, the sixth spacer element is disposed between the sixth lens and the seventh lens and at least partially contacts the image side surface of the sixth lens, and the seventh spacer element is disposed between the seventh lens and the eighth lens and at least partially contacts the image side surface of the seventh lens; the optical imaging device satisfies: 1.8 < |f8 / f| < 2.8, -2.10 < f8 / (R15 + R16) < -1.15, and 0.9 < (EP67 + CP7) / T78 < 2.4, where f8 is the effective focal length of the eighth lens, f is the effective focal length of the optical imaging device, R15 is the curvature radius of the object side surface of the eighth lens, R16 is the curvature radius of the image side surface of the eighth lens, EP67 is the interval distance along the optical axis between the image side surface of the sixth spacer element and the object side surface of the seventh spacer element, CP7 is the thickness of the seventh spacer element along the optical axis, and T78 is the air interval between the seventh lens and the eighth lens on the optical axis.

[0004] In one embodiment, the spacer element group further includes: a fifth spacer element disposed between the fifth lens and the sixth lens and at least partially in contact with the image side surface of the fifth lens; the optical imaging device satisfies: 1.5 < EP56 / CT6 < 2.3, where EP56 is the axial distance between the image side surface of the fifth spacer element and the object side surface of the sixth spacer element along the optical axis, and CT6 is the central thickness of the sixth lens on the optical axis.

[0005] In one embodiment, the optical imaging device satisfies: -0.75 < f78 / d7s < -0.42, where f78 is the combined focal length of the seventh lens and the eighth lens, and d7s is the inner diameter of the object side surface of the seventh spacer element in a direction perpendicular to the optical axis.

[0006] In one embodiment, the spacer element group further includes: a fifth spacer element disposed between the fifth lens and the sixth lens and at least partially in contact with the image side surface of the fifth lens; the optical imaging device satisfies: 3.4 < d5s / EPD × |f5 / R9| < 4.95, where d5s is the inner diameter of the object side surface of the fifth spacer element in a direction perpendicular to the optical axis, EPD is the entrance pupil diameter of the optical imaging device, f5 is the effective focal length of the fifth lens, and R9 is the curvature radius of the object side surface of the fifth lens.

[0007] In one embodiment, the optical imaging device satisfies: 2.6 < L / Dr10r15 × |f8 / f7| < 3.7, where L is the maximum axial distance from the object side end face of the lens barrel to the image side end face of the lens barrel, Dr10r15 is the axial distance between the image side surface of the fifth lens and the object side surface of the eighth lens, f7 is the effective focal length of the seventh lens, and f8 is the effective focal length of the eighth lens.

[0008] In one embodiment, the spacer element group further includes: a third spacer element disposed between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens; the optical imaging device satisfies: 16.55 < d3m / (CT3 + T34) < 18, where d3m is the inner diameter of the image side surface of the third spacer element in a direction perpendicular to the optical axis, CT3 is the central thickness of the third lens on the optical axis, and T34 is the air gap between the third lens and the fourth lens on the optical axis.

[0009] In one embodiment, the spacer element group further includes: a fifth spacer element disposed between the fifth lens and the sixth lens and at least partially in contact with the image side surface of the fifth lens; the optical imaging device satisfies: 3.95 < EP56 / (T56 + |SAG61|) < 5.9, where EP56 is the axial distance between the image side surface of the fifth spacer element and the object side surface of the sixth spacer element, T56 is the air gap between the fifth lens and the sixth lens on the optical axis, and SAG61 is the axial distance between the intersection of the object side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object side surface of the sixth lens.

[0010] In one embodiment, the spacer element group further includes: a third spacer element disposed between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens, and a fourth spacer element disposed between the fourth lens and the fifth lens and at least partially in contact with the image side surface of the fourth lens; the optical imaging device satisfies: 2.45 < (D4s - d3m) / EP34 < 9.5, where D4s is the outer diameter of the object side surface of the fourth spacer element in a direction perpendicular to the optical axis, d3m is the inner diameter of the image side surface of the third spacer element in a direction perpendicular to the optical axis, and EP34 is the axial distance between the image side surface of the third spacer element and the object side surface of the fourth spacer element.

[0011] In one embodiment, the optical imaging device satisfies: 3.6 < d6s / Yc62 < 5.05, where d6s is the outer diameter of the object side surface of the sixth spacer element in a direction perpendicular to the optical axis, and Yc62 is the perpendicular distance between the inflection point closest to the vertex of the effective radius of the image side surface of the sixth lens and the optical axis.

[0012] In one embodiment, the optical imaging device satisfies: 3.8 < d6m / Yc71 < 5.2, where d6m is the inner diameter of the image side surface of the sixth spacer element in a direction perpendicular to the optical axis, and Yc71 is the perpendicular distance between the inflection point closest to the vertex of the effective radius of the object side surface of the seventh lens and the optical axis.

[0013] In one embodiment, the spacer element group further includes: a fifth spacer element disposed between the fifth lens and the sixth lens and at least partially in contact with the image side surface of the fifth lens; the optical imaging device satisfies: 0.75 < EP56 / Yc61 < 1.15, where EP56 is the axial distance between the image side surface of the fifth spacer element and the object side surface of the sixth spacer element, and Yc61 is the perpendicular distance between the inflection point closest to the vertex of the effective radius of the object side surface of the sixth lens and the optical axis.

[0014] In one embodiment, the optical imaging device satisfies: -11.35 < (N7 × R13) / EP67 < -5.25, where N7 is the refractive index of the seventh lens, R13 is the radius of curvature of the object side surface of the seventh lens, and EP67 is the axial distance between the image side surface of the sixth spacer element and the object side surface of the seventh spacer element.

[0015] In one embodiment, the spacer element group further includes: a fifth spacer element disposed between the fifth lens and the sixth lens and at least partially in contact with the image side surface of the fifth lens; the optical imaging device satisfies: 0.25 < (d6s - d5m) / (f5 - f) < 1.5, where d6s is the inner diameter of the object side surface of the sixth spacer element in a direction perpendicular to the optical axis, d5m is the inner diameter of the image side surface of the fifth spacer element in a direction perpendicular to the optical axis, f5 is the effective focal length of the fifth lens, and f is the effective focal length of the optical imaging device.

[0016] In one embodiment, the spacer element group further includes: a fourth spacer element disposed between the fourth lens and the fifth lens and at least partially in contact with the image side surface of the fourth lens; the optical imaging device satisfies: 3.8 < D4s / |f4 - f5| < 5.85, where D4s is the outer diameter of the object side surface of the fourth spacer element in a direction perpendicular to the optical axis, f4 is the effective focal length of the fourth lens, and f5 is the effective focal length of the fifth lens.

[0017] In a second aspect of the present application, there is provided an optical imaging device including: a lens barrel, and a lens group and a spacer element group disposed within the lens barrel. The lens group sequentially includes, along the optical axis from the object side to the image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. The first lens, the fourth lens, and the fifth lens all have positive optical powers, and the second lens, the third lens, the sixth lens, the seventh lens, and the eighth lens all have negative optical powers. The spacer element group includes: a fifth spacer element disposed between the fifth lens and the sixth lens and at least partially in contact with the image side surface of the fifth lens; the optical imaging device satisfies: 3.4 < d5s / EPD × |f5 / R9| < 4.95, where d5s is the inner diameter of the object side surface of the fifth spacer element in a direction perpendicular to the optical axis, EPD is the entrance pupil diameter of the optical imaging device, f5 is the effective focal length of the fifth lens, and R9 is the radius of curvature of the object side surface of the fifth lens.

[0018] A third aspect of the present application provides an optical imaging device, which includes: a lens barrel, and a lens group and a spacer element group disposed within the lens barrel. Among them, the lens group sequentially includes, from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. Among them, the first lens, the fourth lens, and the fifth lens all have positive optical powers, and the second lens, the third lens, the sixth lens, the seventh lens, and the eighth lens all have negative optical powers; the spacer element group includes a fifth spacer element and a sixth spacer element. The fifth spacer element is disposed between the fifth lens and the sixth lens and is at least partially in contact with the image side surface of the fifth lens, and the sixth spacer element is disposed between the sixth lens and the seventh lens and is at least partially in contact with the image side surface of the sixth lens; the optical imaging device satisfies: 3.95 < EP56 / (T56 + |SAG61|) < 5.9, where EP56 is the axial spacing distance between the image side surface of the fifth spacer element and the object side surface of the sixth spacer element, T56 is the air spacing between the fifth lens and the sixth lens on the optical axis, and SAG61 is the axial distance between the intersection point of the object side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object side surface of the sixth lens.

[0019] The present application provides an eight-piece optical imaging device with a reasonable combination of positive and negative optical powers, satisfying 1.8 < |f8 / f| < 2.8, -2.10 < f8 / (R15 + R16) < -1.15, and 0.9 < (EP67 + CP7) / T78 < 2.4. Satisfying 1.8 < |f8 / f| < 2.8 and reasonably setting the effective focal length of the eighth lens is beneficial for the eighth lens to effectively receive the imaging light rays from the first to seventh lenses in front. While ensuring sufficient depth of field and viewing angle, it reduces problems such as aberration and distortion caused by focal length mismatch, thereby ensuring the imaging quality of the lens. At the same time, it also satisfies -2.10 < f8 / (R15 + R16) < -1.15. Further adjusting the relationship between the focal length of the eighth lens and the curvature radii of its object side and image side can more precisely control the light propagation path and imaging quality, helping to reduce optical aberrations such as astigmatism and coma and improving the clarity and resolution of the image. However, the focal length f of the optical imaging device determines the distance that needs to be maintained between the lenses and the distance between the lens and the imaging plane, which adds spatial limitations to the lens structure arrangement. At the same time, the limitation of the focal length f8 of the eighth lens controls the thickness and curvature of the eighth lens, thus adding size limitations and instability to the supporting structure of the eighth lens again, which may cause performance variation of the lens after reliability tests (such as high temperature and high humidity). The present application reasonably controls the spacing distance and thickness of the sixth spacer element and the seventh spacer element and satisfies the conditional formula 0.9 < (EP67 + CP7) / T78 < 2.4. While satisfying the focal length f, it ensures the rationality of the overall lens group structure support and the stability of the supporting structure of the eighth lens; the control of the air gap between the seventh lens and the eighth lens ensures the rationality and stability of the structural arrangement of the seventh lens and the eighth lens, avoiding field curvature variation of the lens, that is, ultimately avoiding deformation of the eighth lens caused by extrusion between the lens and the lens barrel due to water absorption and expansion of the eighth lens after the high temperature and high humidity test, resulting in variation of the lens structure and focal length, and further affecting the imaging quality of the lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Other features, objects, and advantages of the present application will become more apparent by reading the detailed description of the non-limiting embodiments with reference to the following drawings:

[0021] Figure 1 Shows a structural layout diagram of an optical imaging device according to the present application and a schematic diagram of some parameters;

[0022] Figure 2A Shows a structural schematic diagram of the optical imaging device according to Embodiment 1 of the present application;

[0023] Figure 2B Shows a structural schematic diagram of the optical imaging device according to Embodiment 2 of the present application;

[0024] Figure 2C Shows a schematic structural diagram of an optical imaging device according to Embodiment 3 of the present application;

[0025] Figures 3A to 3D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of the optical imaging device according to Embodiments 1 to 3 of the present application;

[0026] Figure 4A Shows a schematic structural diagram of an optical imaging device according to Embodiment 4 of the present application;

[0027] Figure 4B Shows a schematic structural diagram of an optical imaging device according to Embodiment 5 of the present application;

[0028] Figure 4C Shows a schematic structural diagram of an optical imaging device according to Embodiment 6 of the present application;

[0029] Figures 5A to 5D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of the optical imaging device according to Embodiments 4 to 6 of the present application;

[0030] Figure 6A Shows a schematic structural diagram of an optical imaging device according to Embodiment 7 of the present application;

[0031] Figure 6B Shows a schematic structural diagram of an optical imaging device according to Embodiment 8 of the present application;

[0032] Figure 6C Shows a schematic structural diagram of an optical imaging device according to Embodiment 9 of the present application; and

[0033] Figures 7A to 7D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of the optical imaging device according to Embodiments 7 to 9 of the present application. Detailed implementation manners

[0034] To better understand the present application, more detailed descriptions of various aspects of the present application will be made 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 do not 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.

[0035] It should be noted that in this specification, the expressions such as first, second, third, etc. are only used to distinguish one feature from another, and do not represent any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0036] In the drawings, for the sake of clarity, the thickness, dimensions, and shapes of the lenses have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are shown by way of example. That is, the spherical or aspherical shapes are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are for illustrative purposes only and are not drawn to an exact scale.

[0037] In this context, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens that is closer to the object to be photographed is called the object side surface of the lens, and the surface of each lens that is closer to the imaging surface is called the image side surface of the lens.

[0038] It should also be understood that the terms "comprises", "comprising", "has", "including", and / or "including having", when used in this specification, denote the presence of the stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Further, when an expression such as "at least one of..." appears after a list of listed features, it modifies the entire list of listed features, rather than individual elements in the list. In addition, when describing the embodiments of this application, the use of "may" means "one or more embodiments of this application". And the term "exemplary" is intended to refer to an example or illustration.

[0039] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms (such as those defined in a common dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0040] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The following embodiments only represent several implementation manners of the present application. Their descriptions are relatively specific and detailed, but should not be construed as a limitation on the patent 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 modifications and improvements can be made, and these all belong to the protection scope of the present application. For example, the lens group, lens barrel, and spacer elements in the embodiments of the present application can be arbitrarily combined, and it is not limited that the lens group in one embodiment can only be combined with the lens barrel, spacer elements, etc. in that embodiment.

[0041] The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments. Figure 1 The structural layout diagram of an optical imaging device according to the present application and a schematic diagram of some parameters are shown. Those skilled in the art should understand that some parameters of lenses that are often used in the art (such as the central thickness CT1 of the first lens on the optical axis) are not shown in Figure 1 it. Figure 1 Only some parameters of the lens barrel and spacer elements of an optical imaging device of the present application are exemplarily shown for better understanding of the present invention. As Figure 1 shown, L is the maximum distance along the optical axis from the object-side end face of the lens barrel to the image-side end face of the lens barrel, SAG61 is the axial distance between the intersection of the object side face of the sixth lens and the optical axis and the vertex of the effective radius of the object side face of the sixth lens, EP56 is the axial distance between the image side face of the fifth spacer element and the object side face of the sixth spacer element, EP67 is the axial distance between the image side face of the sixth spacer element and the object side face of the seventh spacer element, d3m is the inner diameter of the image side face of the third spacer element in the direction perpendicular to the optical axis, D4s is the outer diameter of the object side face of the fourth spacer element in the direction perpendicular to the optical axis, d5s is the inner diameter of the object side face of the fifth spacer element in the direction perpendicular to the optical axis, d6s is the inner diameter of the object side face of the sixth spacer element in the direction perpendicular to the optical axis, d5m is the inner diameter of the image side face of the fifth spacer element in the direction perpendicular to the optical axis, d6m is the inner diameter of the image side face of the sixth spacer element in the direction perpendicular to the optical axis, d7s is the inner diameter of the object side face of the seventh spacer element in the direction perpendicular to the optical axis, D7s is the outer diameter of the object side face of the seventh spacer element in the direction perpendicular to the optical axis. Yc61 is the perpendicular distance between the inflection point closest to the vertex of the effective radius of the object side face of the sixth lens and the optical axis, Yc62 is the perpendicular distance between the inflection point closest to the vertex of the effective radius of the image side face of the sixth lens and the optical axis, and Yc71 is the perpendicular distance between the inflection point closest to the vertex of the effective radius of the object side face of the seventh lens and the optical axis.

[0042] An optical imaging device according to an exemplary embodiment of the present application includes a lens barrel, and a lens group and a spacer element group disposed within the lens barrel. The lens group sequentially includes, from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens.

[0043] In the exemplary embodiment, the first lens, the fourth lens, and the fifth lens all have positive optical powers, and the second lens, the third lens, the sixth lens, the seventh lens, and the eighth lens all have negative optical powers.

[0044] In the exemplary embodiment, the spacer element group of the optical imaging device may include at least one of a first spacer element, a second spacer element, a third spacer element, a fourth spacer element, a fifth spacer element, a sixth spacer element, a seventh spacer element, and an eighth spacer element. The first spacer element is disposed between the first lens and the second lens and is at least partially in contact with the image side surface of the first lens. The second spacer element is disposed between the second lens and the third lens and is at least partially in contact with the image side surface of the second lens. The third spacer element is disposed between the third lens and the fourth lens and is at least partially in contact with the image side surface of the third lens. The fourth spacer element is disposed between the fourth lens and the fifth lens and is at least partially in contact with the image side surface of the fourth lens. The fifth spacer element is disposed between the fifth lens and the sixth lens and is at least partially in contact with the image side surface of the fifth lens. The sixth spacer element is disposed between the sixth lens and the seventh lens and is at least partially in contact with the image side surface of the sixth lens. The seventh spacer element is disposed between the seventh lens and the eighth lens and is at least partially in contact with the image side surface of the seventh lens. The eighth spacer element is disposed on the image side of the eighth lens and is at least partially in contact with the image side surface of the eighth lens.

[0045] It should be understood that the present application does not specifically limit the number of spacer elements. Any number of spacer elements may be included between any two lenses, and any number of spacer elements may also be included in the entire optical imaging device. The spacer elements help the optical imaging device intercept redundant refracted and reflected light paths, reducing the generation of stray light and ghost images. Adding auxiliary support 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.

[0046] In the exemplary embodiment, the spacer element group may include a sixth spacer element and a seventh spacer element, wherein the sixth spacer element is disposed between the sixth lens and the seventh lens and is at least partially in contact with the image side surface of the sixth lens, and the seventh spacer element is disposed between the seventh lens and the eighth lens and is at least partially in contact with the image side surface of the seventh lens.

[0047] In an exemplary embodiment, the optical imaging device according to the present application may satisfy: 1.8 < |f8 / f| < 2.8, where f8 is the effective focal length of the eighth lens and f is the effective focal length of the optical imaging device. Reasonably setting the effective focal length of the eighth lens is beneficial for the eighth lens to effectively receive the imaging light rays from the first to seventh lenses in front. While ensuring sufficient depth of field and viewing angle, it reduces problems such as aberration and distortion caused by focal length mismatch, thereby ensuring the imaging quality of the lens.

[0048] In an exemplary embodiment, the optical imaging device according to the present application may satisfy: -2.10 < f8 / (R15 + R16) < -1.15, where f8 is the effective focal length of the eighth lens, R15 is the radius of curvature of the object side surface of the eighth lens, and R16 is the radius of curvature of the image side surface of the eighth lens. By satisfying -2.10 < f8 / (R15 + R16) < -1.15, and adjusting the relationship between the focal length of the eighth lens and the radii of curvature of its object side surface and image side surface, the propagation path of light and the imaging quality can be more finely controlled, which helps to reduce optical aberrations such as astigmatism and coma, and improve the clarity and resolution of the image.

[0049] In an exemplary embodiment, the optical imaging device according to the present application may satisfy: 0.9 < (EP67 + CP7) / T78 < 2.4, where EP67 is the axial distance between the image side surface of the sixth spacer element and the object side surface of the seventh spacer element, CP7 is the thickness of the seventh spacer element along the optical axis, and T78 is the air gap between the seventh lens and the eighth lens on the optical axis. By satisfying the conditional expression 0.9 < (EP67 + CP7) / T78 < 2.4 and controlling the distance and thickness between the sixth spacer element and the seventh spacer element, it is beneficial to ensure the rationality of the overall lens group structure support and the stability of the support structure of the eighth lens while satisfying the focal length f of the optical imaging device; through the control of the air gap between the seventh lens and the eighth lens, the rationality and stability of the structural arrangement of the seventh lens and the eighth lens are ensured, and the field curvature variation of the lens is avoided, that is, ultimately, after the lens undergoes high-temperature and high-humidity tests, the eighth lens is deformed due to the lens and the lens barrel being squeezed caused by the eighth lens absorbing water and swelling, resulting in the variation of the structure and focal length of the lens, thereby affecting the imaging quality of the lens.

[0050] An optical imaging device according to an exemplary embodiment of the present application includes: a lens barrel, and a lens group and a spacer element group disposed within the lens barrel. The lens group sequentially includes, from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, wherein the first lens, the fourth lens, and the fifth lens all have positive optical powers, and the second lens, the third lens, the sixth lens, the seventh lens, and the eighth lens all have negative optical powers; the spacer element group includes: a sixth spacer element and a seventh spacer element, wherein the sixth spacer element is disposed between the sixth lens and the seventh lens and is at least partially in contact with the image side surface of the sixth lens, and the seventh spacer element is disposed between the seventh lens and the eighth lens and is at least partially in contact with the image side surface of the seventh lens; the optical imaging device satisfies: 1.8 < |f8 / f| < 2.8, -2.10 < f8 / (R15 + R16) < -1.15, and 0.9 < (EP67 + CP7) / T78 < 2.4, where f8 is the effective focal length of the eighth lens, f is the effective focal length of the optical imaging device, R15 is the curvature radius of the object side surface of the eighth lens, R16 is the curvature radius of the image side surface of the eighth lens, EP67 is the axial spacing distance between the image side surface of the sixth spacer element and the object side surface of the seventh spacer element, CP7 is the thickness of the seventh spacer element along the optical axis, and T78 is the air spacing between the seventh lens and the eighth lens on the optical axis. Satisfying 1.8 < |f8 / f| < 2.8, reasonably setting the effective focal length of the eighth lens is beneficial for the eighth lens to effectively receive the imaging light rays of the front first lens to the seventh lens, while ensuring sufficient depth of field and viewing angle, reducing problems such as aberration and distortion caused by focal length mismatch, thereby ensuring the imaging quality of the lens. At the same time, it also satisfies -2.10 < f8 / (R15 + R16) < -1.15. Further adjusting the relationship between the focal length of the eighth lens and the curvature radii of its object side surface and image side surface can more precisely control the propagation path of light rays and the imaging quality, helping to reduce optical aberrations such as astigmatism and coma, and improving the clarity and resolution of the image. However, the focal length f of the optical imaging device determines the distances that need to be maintained between the lenses, as well as the distance between the lens and the imaging plane, which adds spatial limitations to the lens structure arrangement. At the same time, the limitation of the focal length f8 of the eighth lens controls the thickness and curvature of the eighth lens, thereby adding size limitations and instability to the supporting structure of the eighth lens again, which may cause performance variation of the lens after reliability tests (such as high temperature and high humidity).By reasonably controlling the spacing distance and thickness of the sixth spacer element and the seventh spacer element, and satisfying the conditional formula 0.9 < (EP67 + CP7) / T78 < 2.4, while satisfying the focal length f, the rationality of the overall lens group structure bearing and the stability of the bearing structure of the eighth lens are ensured; the control of the air gap between the seventh lens and the eighth lens ensures the rationality and stability of the structural arrangement of the seventh lens and the eighth lens, avoiding the variation of the lens field curvature, that is, ultimately avoiding the deformation of the eighth lens caused by the extrusion of the lens and the lens barrel due to the water absorption and expansion of the eighth lens after the high-temperature and high-humidity test, resulting in the variation of the lens structure and focal length, and further affecting the imaging quality of the lens.

[0051] The optical imaging device according to an exemplary embodiment of the present application satisfies 1.8 < |f8 / f| < 2.8, -2.10 < f8 / (R15 + R16) < -1.15, and 0.9 < (EP67 + CP7) / T78 < 2.4, ensuring the stability of the imaging performance of the overall lens. When dealing with the high-temperature and high-humidity test, the deformation amount caused by the extrusion of the lens and the lens barrel due to the water absorption and expansion of the lens is smaller, so that the change amounts of the main evaluation indexes such as MTF, f, and BFL are smaller, and the failure risk is lower. Specifically, MTF (Modulation Transfer Function) represents the modulation transfer function, and MTF is a quantitative evaluation index for the optical performance of the lens, used to describe the efficiency of the transmitted light at different spatial frequencies. f represents the effective focal length of the optical imaging lens, and BFL represents the back focal length, that is, the axial distance from the image side of the eighth lens in the optical imaging device to the imaging plane. The beneficial effects of the above technical solutions of the present application will be further described below with reference to Table 1.

[0052] Table 1 shows the change amounts of f, BFL, and MTF at different fields of view of three lenses according to an exemplary embodiment of the present application before and after the high-temperature and high-humidity test. Among them, lens 1 satisfies |f8 / f| = 1.85, f8 / (R15 + R16) = -1.19, and (EP67 + CP7) / T78 = 0.93; lens 2 satisfies |f8 / f| = 1.85, f8 / (R15 + R16) = -1.19, and (EP67 + CP7) / T78 = 0.5; lens 3 satisfies |f8 / f| = 1.85, f8 / (R15 + R16) = -1.19, and (EP67 + CP7) / T78 = 3.

[0053]

[0054] Table 1

[0055] The change amounts of f, BFL, and MTF at different fields of view of the three lenses in Table 1 before and after the high-temperature and high-humidity test. Here, the change amount is the difference between the value after the test and the value before the test. For example, a negative number in Table 1 indicates that the value after the test is smaller than the value before the test, and a positive number indicates that the value after the test is larger than the value before the test. In Table 1, the units of f and BFL are millimeters (mm), and the units of the change amount of f and the change amount of BFL are also millimeters (mm). MTF has no unit. More specifically, the change amount of MTF is the change amount of MTF at a spatial frequency of 63 lp / mm. In addition, in Table 1, S represents the sagittal direction, T represents the meridional direction, and center, 0.2F, 0.5F, 0.75F, 0.8F, 0.86F represent different fields of view respectively.

[0056] The test content of the high-temperature and high-humidity test in Table 1 can be set, for example, as: temperature 85 °C, relative humidity 85% RH, and the times are 24 hours, 48 hours, and 100 hours respectively.

[0057] As shown in Table 1, lens 1 satisfies 1.8 < |f8 / f| < 2.8 and -2.10 < f8 / (R15 + R16) < -1.15. Lens 1 also satisfies -0.9 < (EP67 + CP7) / T78 < 2.4. The maximum change amounts of its f and BFL are -0.002 mm, and the maximum change amount of MTF is 1.26.

[0058] Lens 2 satisfies 1.8 < |f8 / f| < 2.8 and -2.10 < f8 / (R15 + R16) < -1.15, but does not satisfy 0.9 < (EP67 + CP7) / T78 < 2.4. The change amounts of its f and BFL are from 0.002 mm to 0.006 mm, and the maximum change amount of MTF is 3.67.

[0059] Lens 3 satisfies 1.8 < |f8 / f| < 2.8 and -2.10 < f8 / (R15 + R16) < -1.15, but does not satisfy 0.9 < (EP67 + CP7) / T78 < 2.4. The change amounts of its f and BFL are from 0.001 mm to 0.006 mm, and the maximum change amount of MTF is 3.80.

[0060] Based on the above analysis, we can know that lens 1 satisfies 1.8<|f8 / f|<2.8, -2.10 <f8 / (R15+R16)<-1.15及0.9<(EP67+CP7) / T78<2.4,在经过24h、48h、100h的高温高湿试验后,均可将f、BFL的变化量管控在3μm以内,MTF的变化量管控在1.5以内,镜头的稳定性较好,成像品质高。而镜头2和镜头3不满足0.9<(EP67+CP7) / T78<2.4,其f、BFL、MTF的变化量较大,不满足上述f、BFL的变化量管控在3μm以内及MTF的变化量管控在1.5以内的管控要求,会严重影响成像品质。因此,本申请提供的八片式光学成像装置满足1.8<|f8 / f|<2.8、-2.10<f8 / (R15+R16)<-1.15及0.9<(EP67+CP7) / T78<2.4,可以保证第七透镜和第八透镜的结构排布合理性及稳定性,避免了镜头场曲变异,即,最终避免镜头在经高温高湿试验后,因第八透镜吸水膨胀导致透镜和镜筒挤压引起第八透镜的变形,导致透镜的结构及焦距变异,进而影响镜头成像品质,具有良好的组装稳定性,更好地满足行业应用需求。

[0061] In an exemplary embodiment, the optical imaging device according to the present application may satisfy: 1.5 <EP56 / CT6<2.3,其中,EP56为第五间隔元件的像侧面与第六间隔元件的物侧面沿光轴方向的间隔距离,CT6为第六透镜在光轴上的中心厚度。通过控制第五间隔元件的像侧面与第六间隔元件的物侧面沿光轴方向的间隔距离与第六透镜在光轴上的中心厚度的比值,可以保证第六透镜的厚薄比在合理的范围内,以确保镜头在跌落、高温高湿等情况下,第六透镜的中厚与边厚较稳定,进一步使镜头的成像效果受外界影响较小。

[0062] In an exemplary embodiment, the optical imaging device according to the present application may satisfy: -0.75 <f78 / d7s<-0.42,其中,f78为第七透镜与第八透镜的组合焦距,d7s为第七间隔元件的物侧面在垂直于光轴方向上的内径。通过控制第七间隔元件的物侧面在垂直于光轴方向上的内径及第七透镜与第八透镜的组合焦距,有助于第七透镜与第八透镜及第七透镜与其前方透镜光学系统的承接,使成像的品质更高,减弱成像畸变,同时控制第七间隔元件的内径,能够有效拦截掉不必要的光线。

[0063] In an exemplary embodiment, the optical imaging device according to the present application may satisfy: 3.4 < d5s / EPD × |f5 / R9| < 4.95, where d5s is the inner diameter of the object side surface of the fifth spacer element in the direction perpendicular to the optical axis, EPD is the entrance pupil diameter of the optical imaging device, f5 is the effective focal length of the fifth lens, and R9 is the radius of curvature of the object side surface of the fifth lens. By controlling the inner diameter of the fifth spacer element, unnecessary light can be effectively intercepted, the processing difficulty of the fifth spacer element can be reduced, and the assembly stability can be improved; controlling the focal length of the fifth lens can ensure the connection between the fifth lens and the front and rear imaging systems, and improve the imaging quality; controlling the entrance pupil diameter is beneficial to ensuring sufficient light transmission and ensuring the imaging quality; controlling the radius of curvature of the object side surface of the fifth lens is beneficial to ensuring the imaging quality while reducing the mold processing and forming difficulty of the fifth lens.

[0064] In an exemplary embodiment, the optical imaging device according to the present application may satisfy: 2.6 < L / Dr10r15 × |f8 / f7| < 3.7, where L is the maximum distance along the optical axis from the object side end face of the lens barrel to the image side end face of the lens barrel, Dr10r15 is the distance on the optical axis from the image side surface of the fifth lens to the object side surface of the eighth lens, f7 is the effective focal length of the seventh lens, and f8 is the effective focal length of the eighth lens. Controlling the length of the lens barrel is beneficial to ensuring the arrangement stability of the lens structure and at the same time ensuring the lightweight of the lens; controlling the distance on the optical axis from the image side surface of the fifth lens to the object side surface of the eighth lens can ensure the structural arrangement of the sixth, seventh, and eighth lenses, reduce the processing and forming difficulty of the lenses, and at the same time ensure the imaging quality; controlling the effective focal length of the seventh lens can ensure the connection between the seventh lens and the front and rear imaging systems, and controlling the effective focal length of the eighth lens can ensure that the imaging system images better onto the image plane and improve the imaging quality of the lens.

[0065] In an exemplary embodiment, the optical imaging device according to the present application may satisfy: 16.55 < d3m / (CT3 + T34) < 18, where d3m is the inner diameter of the image side surface of the third spacer element in the direction perpendicular to the optical axis, CT3 is the central thickness of the third lens on the optical axis, and T34 is the air gap on the optical axis between the third lens and the fourth lens. By controlling the inner diameter of the third spacer element, unnecessary light can be effectively intercepted. Controlling the central thickness of the third lens and the air gap between the third lens and the fourth lens can, while ensuring the stable rationality of the bearing structure design, be beneficial to the improvement of the imaging quality, especially the control of the imaging field curvature.

[0066] In an exemplary embodiment, the optical imaging device according to the present application may satisfy: 3.95 < EP56 / (T56 + |SAG61|) < 5.9, where EP56 is the distance between the image side of the fifth spacer element and the object side of the sixth spacer element along the optical axis direction, T56 is the air gap between the fifth lens and the sixth lens on the optical axis, and SAG61 is the axial distance between the intersection of the object side of the sixth lens and the optical axis and the vertex of the effective radius of the object side of the sixth lens. By controlling the distance between the image side of the fifth spacer element and the object side of the sixth spacer element along the optical axis direction, the stability of the bearing structure design can be ensured, and the forming difficulty can be reduced. By controlling the air gap between the fifth lens and the sixth lens, the imaging field curvature quality can be effectively controlled, and at the same time, the collision and abrasion between lenses caused by mechanical vibrations such as dropping can be avoided; restricting the sag of the object side of the sixth lens is beneficial to ensuring the uniformity of the surface shape transition of the sixth lens, avoiding stress concentration, and at the same time, is beneficial to reducing the forming difficulty of the sixth lens.

[0067] In an exemplary embodiment, the optical imaging device according to the present application may satisfy: 2.45 < (D4s - d3m) / EP34 < 9.5, where D4s is the outer diameter of the object side of the fourth spacer element in the direction perpendicular to the optical axis, d3m is the inner diameter of the image side of the third spacer element in the direction perpendicular to the optical axis, and EP34 is the distance between the image side of the third spacer element and the object side of the fourth spacer element along the optical axis direction. Controlling the inner diameter of the image side of the third spacer element and the outer diameter of the object side of the fourth spacer element is beneficial to restricting the outer dimension of the lens barrel, ensuring the uniformity of the lens barrel structure transition, reducing the forming difficulty of the lens barrel, and at the same time, is also beneficial to the forming and processing of the third spacer element and the fourth spacer element; controlling the distance between the third spacer element and the fourth spacer element ensures the stability of the bearing and reduces the processing and forming difficulty of the third lens and the fourth lens.

[0068] In an exemplary embodiment, the optical imaging device according to the present application may satisfy: 3.6 < d6s / Yc62 < 5.05, where d6s is the outer diameter of the object side of the sixth spacer element in the direction perpendicular to the optical axis, and Yc62 is the perpendicular distance between the inflection point closest to the vertex of the effective radius of the image side of the sixth lens and the optical axis. Satisfying 3.6 < d6s / Yc62 < 5.05, by controlling the inner diameter of the object side of the sixth spacer element, unnecessary passing light can be effectively intercepted, and it is avoided that unnecessary light reaches the imaging surface through the seventh lens and the eighth lens, thereby affecting the imaging quality; the control of YC62 makes the transition at the inflection point of the image side of the sixth lens smoother, reduces the mold processing difficulty and the forming difficulty, and ensures the imaging quality.

[0069] In an exemplary embodiment, the optical imaging device according to the present application may satisfy: 3.8 < d6m / Yc71 < 5.2, where d6m is the inner diameter of the image side of the sixth spacer element in the direction perpendicular to the optical axis, and Yc71 is the perpendicular distance from the inflection point of the object side of the seventh lens closest to the vertex of the effective radius to the optical axis. Satisfying 3.8 < d6m / Yc71 < 5.2, by controlling the inner diameter of the image side of the sixth spacer element, unnecessary light can be effectively intercepted. At the same time, the volume and weight of the sixth spacer element can also be controlled; the control of YC71 makes the transition at the inflection point of the object side of the seventh lens smoother, reduces the mold processing difficulty and the forming difficulty, and ensures the imaging quality.

[0070] In an exemplary embodiment, the optical imaging device according to the present application may satisfy: 0.75 < EP56 / Yc61 < 1.15, where EP56 is the axial spacing distance between the image side of the fifth spacer element and the object side of the sixth spacer element, and Yc61 is the perpendicular distance from the inflection point of the object side of the sixth lens closest to the vertex of the effective radius to the optical axis. Satisfying 0.75 < EP56 / Yc61 < 1.15, by controlling the axial spacing distance between the image side of the fifth spacer element and the object side of the sixth spacer element, the stability of the bearing structure design can be ensured and the forming difficulty can be reduced; the control of YC61 makes the transition at the inflection point of the object side of the sixth lens smoother, reduces the mold processing difficulty and the forming difficulty, and at the same time better ensures the passage of light and avoids imaging distortion.

[0071] In an exemplary embodiment, the optical imaging device according to the present application may satisfy: -11.35 < (N7 × R13) / EP67 < -5.25, where N7 is the refractive index of the seventh lens, R13 is the curvature radius of the object side of the seventh lens, and EP67 is the axial spacing distance between the image side of the sixth spacer element and the object side of the seventh spacer element. By controlling the spacing distance between the image side of the sixth spacer element and the object side of the seventh spacer element, the bearing design can be made more stable, the processing and forming difficulty of the sixth lens and the seventh lens can be reduced, and at the same time, by controlling the refractive index of the seventh lens, a sufficient amount of light can be ensured to pass through the seventh lens and the imaging quality can be improved.

[0072] In an exemplary embodiment, the optical imaging device according to the present application may satisfy: 0.25 < (d6s - d5m) / (f5 - f) < 1.5, where d6s is the inner diameter of the object side surface of the sixth spacer element in the direction perpendicular to the optical axis, d5m is the inner diameter of the image side surface of the fifth spacer element in the direction perpendicular to the optical axis, f5 is the effective focal length of the fifth lens, and f is the effective focal length of the optical imaging device. By controlling the inner diameters of the fifth spacer element and the sixth spacer element, unnecessary passing light can be effectively intercepted while making the structural arrangement more reasonable and reducing the processing difficulty of the spacer elements; by controlling the effective focal length of the fifth lens, while ensuring a reasonable and uniform imaging transition between the fifth lens and the front and rear lenses, the processing and forming difficulty of the fifth lens can be reduced; by controlling the focal length of the optical imaging system, it is beneficial to constrain the total length of the lens barrel structure while ensuring the imaging quality, ensure the light weight of the lens, and make the structural arrangement more reasonable.

[0073] In an exemplary embodiment, the optical imaging device according to the present application may satisfy: 3.8 < D4s / |f4 - f5| < 5.85, where D4s is the outer diameter of the object side surface of the fourth spacer element in the direction perpendicular to the optical axis, f4 is the effective focal length of the fourth lens, and f5 is the effective focal length of the fifth lens. By controlling the outer diameter of the object side surface of the fourth spacer element, while reducing the processing difficulty of the fourth spacer element, the rationality and formability of the lens barrel structure transition can be ensured; by controlling the focal lengths of the fourth lens and the fifth lens, the light reception between the fourth lens and the fifth lens and their front and rear lenses is made smoother, the imaging quality is better, and at the same time, the forming stability of the fourth lens and the fifth lens is ensured.

[0074] An optical imaging device according to an exemplary embodiment of the present application includes: a lens barrel, and a lens group and a spacer element group disposed within the lens barrel. Among them, the lens group sequentially includes, from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. Among them, the first lens, the fourth lens, and the fifth lens all have positive optical powers, and the second lens, the third lens, the sixth lens, the seventh lens, and the eighth lens all have negative optical powers; the spacer element group includes: a fifth spacer element disposed between the fifth lens and the sixth lens and at least partially in contact with the image side surface of the fifth lens; the optical imaging device satisfies: 3.4 < d5s / EPD × |f5 / R9| < 4.95, where d5s is the inner diameter of the object side surface of the fifth spacer element in the direction perpendicular to the optical axis, EPD is the entrance pupil diameter of the optical imaging device, f5 is the effective focal length of the fifth lens, and R9 is the curvature radius of the object side surface of the fifth lens. By controlling the inner diameter of the fifth spacer element, unnecessary light can be effectively intercepted, the processing difficulty of the fifth spacer element can be reduced, and the assembly stability can be improved; controlling the focal length of the fifth lens can ensure the connection between the fifth lens and the front and rear imaging systems, and improve the imaging quality; controlling the entrance pupil diameter is beneficial to ensuring sufficient light transmission and ensuring the imaging quality; controlling the curvature radius of the object side surface of the fifth lens is beneficial to ensuring the imaging quality while reducing the mold processing and forming difficulty of the fifth lens.

[0075] An optical imaging device according to an exemplary embodiment of the present application includes: a lens barrel, and a lens group and a spacer element group disposed within the lens barrel. Among them, the lens group sequentially includes, from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. Among them, the first lens, the fourth lens, and the fifth lens all have positive optical powers, and the second lens, the third lens, the sixth lens, the seventh lens, and the eighth lens all have negative optical powers; the spacer element group includes a fifth spacer element and a sixth spacer element. The fifth spacer element is disposed between the fifth lens and the sixth lens and is at least partially in contact with the image side surface of the fifth lens, and the sixth spacer element is disposed between the sixth lens and the seventh lens and is at least partially in contact with the image side surface of the sixth lens; the optical imaging device satisfies: 3.95 < EP56 / (T56 + |SAG61|) < 5.9, where EP56 is the axial distance between the image side surface of the fifth spacer element and the object side surface of the sixth spacer element along the optical axis, T56 is the air gap between the fifth lens and the sixth lens on the optical axis, and SAG61 is the axial distance between the intersection point of the object side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object side surface of the sixth lens. By controlling the axial distance between the image side surface of the fifth spacer element and the object side surface of the sixth spacer element along the optical axis, the stability of the bearing structure design can be ensured and the molding difficulty can be reduced. By controlling the air gap between the fifth lens and the sixth lens, the imaging field curvature quality can be effectively controlled, and at the same time, collisions and abrasions between lenses caused by mechanical vibrations such as dropping can be avoided; restricting the sagittal height of the object side surface of the sixth lens is beneficial to ensuring the uniformity of the surface shape transition of the sixth lens, avoiding stress concentration, and at the same time being beneficial to reducing the molding difficulty of the sixth lens.

[0076] In an embodiment of the present application, at least one of the lens surfaces of each lens is an aspherical lens surface, that is, at least one of the object side surface of the first lens to the image side surface of the eighth lens is an aspherical lens surface. The characteristics of an aspherical lens are that the curvature changes continuously from the center of the lens to the periphery of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the periphery, an aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and astigmatism aberration. After using an aspherical lens, it is possible to eliminate as much as possible the aberration that appears during imaging, thereby improving the imaging quality. Optionally, the object side surfaces and image side surfaces of all the lenses from the first lens to the eighth lens are aspherical lens surfaces.

[0077] In an exemplary embodiment, the above optical imaging device may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0078] The optical imaging device according to the above-described embodiments of the present application may employ multiple lenses, such as eight lenses as described above. By reasonably allocating the optical power, surface shape of each lens, and the arrangement of each spacer element, etc., the span of each gear in the cooperation between the lens and the lens barrel is relatively uniform, enhancing the ability to converge light and improving the imaging quality of the optical imaging device. However, those skilled in the art should understand that without departing from the technical solutions 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 eight lenses are described as an example in the embodiments, the optical imaging device is not limited to including eight lenses. If necessary, the optical imaging device may also include other numbers of lenses.

[0079] The following further describes specific embodiments of the optical imaging device applicable to the above-described embodiments with reference to the drawings. Specifically, refer to Figures 2A to 3D Describe the optical imaging device 1001 according to Embodiment 1 of the present application, the optical imaging device 1002 according to Embodiment 2, and the optical imaging device 1003 according to Embodiment 3; refer to Figures 4A to 5D Describe the optical imaging device 2001 according to Embodiment 4 of the present application, the optical imaging device 2002 according to Embodiment 5, and the optical imaging device 2003 according to Embodiment 6; refer to Figures 6A to 7D Describe the optical imaging device 3001 according to Embodiment 7 of the present application, the optical imaging device 3002 according to Embodiment 8, and the optical imaging device 3003 according to Embodiment 9.

[0080] Example 1

[0081] Figure 2A FIG. shows a schematic structural diagram of the optical imaging device 1001 according to Embodiment 1 of the present application.

[0082] As Figure 2A shown, the optical imaging device 1001 includes a lens barrel P0, a lens group, and a spacer element group. The lens group includes, in order 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, a seventh lens E7, and an eighth lens E8. The first lens E1 has an object side surface S1 and an image side surface S2, the second lens E2 has an object side surface S3 and an image side surface S4, the third lens E3 has an object side surface S5 and an image side surface S6, the fourth lens E4 has an object side surface S7 and an image side surface S8, the fifth lens E5 has an object side surface S9 and an image side surface S10, the sixth lens E6 has an object side surface S11 and an image side surface S12, the seventh lens E7 has an object side surface S13 and an image side surface S14, and the eighth lens E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through each surface S1 to S16 and finally forms an image on the imaging surface (not shown).

[0083] Table 2-1 shows the basic parameter table of the lens group of the optical imaging device 1001 in Embodiment 1, where the units of the radius of curvature, thickness / distance, and effective focal length are all millimeters (mm).

[0084]

[0085]

[0086] Table 2-1

[0087] In Embodiment 1, the object side and the image side of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces, and the surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0088]

[0089] where x is the sagitta, the distance from the vertex of the aspherical surface when the aspherical surface is at a position with a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 2-1 above); k is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspherical surface. Table 2-2 gives the higher-order term coefficients A4, A6, A8, A 10 , A 12 , A 14 , A 16 , A 18 , and A 20 that can be used for each of the aspherical mirrors S1 - S16 in Embodiment 1.

[0090] Surface number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 3.8969E-02 -2.4281E-02 4.0586E-02 -3.9650E-02 7.9840E-04 2.4530E-02 -4.8667E-03 -1.6418E-02 -6.1095E-03 S2 -1.0195E-01 3.3755E-02 9.9059E-03 1.8270E-03 -1.2750E-02 -5.2849E-03 -2.7964E-03 -8.3911E-04 -6.3607E-04 S3 -2.9534E-01 1.2230E-02 -5.8398E-03 4.0514E-03 1.8282E-04 7.6111E-04 3.4754E-05 -3.3904E-05 -8.5089E-05 S4 -3.4920E-01 -9.2997E-03 -8.2510E-03 7.5598E-04 -5.5248E-04 3.2591E-04 9.8264E-05 -2.7005E-05 -3.7493E-05 S5 -1.8763E-01 -1.6072E-02 1.5752E-03 -1.2524E-04 -2.2838E-03 -1.7203E-03 -7.2419E-04 -3.2523E-04 -1.5068E-04 S6 -2.6253E-01 -5.4415E-03 1.2450E-02 -2.2588E-03 1.5802E-03 -3.1767E-03 5.1522E-04 -1.8437E-04 8.3836E-05 S7 -1.6559E-01 1.2142E-01 -4.7961E-02 -3.5748E-02 7.8130E-03 -3.9651E-03 -4.0659E-03 -6.9832E-03 -7.8795E-04 S8 1.5706E-02 1.6703E-01 -8.4629E-02 -2.5254E-03 3.9257E-02 3.1994E-03 -1.3651E-02 -7.2251E-03 -1.9105E-03 S9 3.4907E-01 5.3881E-02 2.4635E-02 1.5836E-02 4.2066E-03 3.0643E-03 2.4764E-04 1.1867E-04 -2.3147E-04 S10 2.8850E-01 -4.5537E-02 1.9871E-02 1.0377E-02 5.6052E-03 2.7565E-03 1.5336E-03 4.8972E-04 4.3433E-04 S11 -9.0196E+00 2.1865E+00 -1.4256E+00 1.8784E-01 -1.2818E-01 5.7801E-02 2.2134E-01 -7.2211E-02 5.2481E-02 S12 -3.1941E+00 7.4492E-01 -2.1563E-01 1.0736E-02 2.1841E-01 1.1438E-02 3.5177E-03 -1.3515E-02 1.6269E-03 S13 -1.5326E-01 -2.5750E-01 2.6416E-01 -1.4809E-01 -1.8909E-02 -1.8334E-02 -4.5227E-03 -5.3698E-03 3.1597E-04 S14 1.2336E+01 -1.5058E+00 -2.2579E+00 3.3053E-01 9.3134E-01 -4.9958E-01 -4.9707E-02 3.1831E-01 2.1249E-01 S15 -3.7072E+00 4.5648E+00 1.1353E+00 1.5954E+00 -5.1131E-01 -6.1869E-01 -3.9583E-02 5.4356E-01 -1.4280E-01 S16 -6.8443E+00 1.0760E+00 -6.2575E-01 1.0480E-01 -2.0252E-01 -2.5193E-03 -5.3651E-02 -1.0345E-02 -2.0427E-02

[0091] Table 2-2

[0092] Table 3 shows the entrance pupil diameter EPD, effective focal length f, combined focal length f78, and SAG61, Yc61, Yc62, Yc71 of the optical imaging device 1001 in Embodiment 1. The units of the parameters in Table 3 are all millimeters (mm).

[0093] Parameter EPD f f78 SAG61 Yc61 Yc62 Yc71 Value 2.5513 5.3656 -4.1952 -0.1514 1.55 1.62 1.57

[0094] Table 3

[0095] As Figure 2AAs shown, the optical imaging device 1001 further includes eight spacer elements, namely a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, a sixth spacer element P6, a seventh spacer element P7, and an eighth spacer element P8. The first spacer element P1 is disposed on the image side of the first lens and at least partially contacts the image side surface of the first lens; the second spacer element P2 is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens; the third spacer element P3 is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens; the fourth spacer element P4 is disposed on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens; the fifth spacer element P5 is disposed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; the sixth spacer element P6 is disposed on the image side of the sixth lens and at least partially contacts the image side surface of the sixth lens; the seventh spacer element P7 is disposed on the image side of the seventh lens and at least partially contacts the image side surface of the seventh lens; the eighth spacer element P8 is disposed on the image side of the eighth lens and at least partially contacts the image side surface of the eighth lens.

[0096] Table 4 shows the basic parameter table of the spacer elements of the optical imaging device 1001. The unit of each parameter in Table 4 is millimeter (mm). The above spacer elements can block the entry of excess external light, enable the lens and the lens barrel to be better supported, and enhance the structural stability of the optical imaging device 1001.

[0097] Parameter d3m D4s d5s d5m d6s d6m d7s D7s EP56 EP67 L EP34 CP7 Value 3.628 5.353 5.589 5.589 6.424 6.424 8.061 11.275 1.504 0.823 8.318 0.364 0.020

[0098] Table 4

[0099] Example 2

[0100] Figure 2B Fig. shows a schematic structural diagram of an optical imaging device 1002 according to Embodiment 2 of the present application. In this embodiment and the following embodiments, for the sake of simplicity, some descriptions similar to those in Embodiment 1 will be omitted.

[0101] As Figure 2B shown, the optical imaging device 1002 includes a lens barrel P0, a lens group, and a spacer element group. The lens group of the optical imaging device 1002 is exactly the same as the lens group of the optical imaging device 1001 in Embodiment 1 and will not be described in detail again. Light from an object sequentially passes through each surface S1 to S16 and finally forms an image on an imaging surface (not shown). The basic parameters of the lens group of the optical imaging device 1002 are shown in detail in Tables 2-1 to 3 and will not be described in detail again.

[0102] As Figure 2BAs shown, the optical imaging device 1002 further includes eight spacer elements, namely a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, a sixth spacer element P6, a seventh spacer element P7, and an eighth spacer element P8. The first spacer element P1 is disposed on the image side of the first lens and is at least partially in contact with the image side surface of the first lens; the second spacer element P2 is disposed on the image side of the second lens and is at least partially in contact with the image side surface of the second lens; the third spacer element P3 is disposed on the image side of the third lens and is at least partially in contact with the image side surface of the third lens; the fourth spacer element P4 is disposed on the image side of the fourth lens and is at least partially in contact with the image side surface of the fourth lens; the fifth spacer element P5 is disposed on the image side of the fifth lens and is at least partially in contact with the image side surface of the fifth lens; the sixth spacer element P6 is disposed on the image side of the sixth lens and is at least partially in contact with the image side surface of the sixth lens; the seventh spacer element P7 is disposed on the image side of the seventh lens and is at least partially in contact with the image side surface of the seventh lens; the eighth spacer element P8 is disposed on the image side of the eighth lens and is at least partially in contact with the image side surface of the eighth lens.

[0103] Table 5 shows the basic parameter table of the spacer elements of the optical imaging device 1002. The unit of each parameter in Table 5 is millimeter (mm). The above spacer elements can block the entry of excess external light, enable the lens and the lens barrel to be better supported, and enhance the structural stability of the optical imaging device 1002.

[0104] Parameter d3m D4s d5s d5m d6s d6m d7s D7s EP56 EP67 L EP34 CP7 Value 3.810 6.738 5.849 5.849 6.424 6.424 8.061 11.275 1.504 0.823 8.318 0.364 0.020

[0105] Table 5

[0106] Example 3

[0107] Figure 2C shows a schematic structural diagram of an optical imaging device 1003 according to Embodiment 3 of the present application.

[0108] As Figure 2C shown, the optical imaging device 1003 includes a lens barrel P0, a lens group, and a spacer element group. The lens group of the optical imaging device 1003 is exactly the same as the lens group of the optical imaging device 1001 in Embodiment 1 and will not be described in detail. Light from an object sequentially passes through each surface S1 to S16 and finally forms an image on an imaging surface (not shown). The basic parameters of the lens group of the optical imaging device 1003 are shown in detail in Tables 2-1 to 3 and will not be described in detail.

[0109] As Figure 2CAs shown, the optical imaging device 1003 further includes eight spacer elements, namely a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, a sixth spacer element P6, a seventh spacer element P7, and an eighth spacer element P8. The first spacer element P1 is placed on the image side of the first lens and at least partially contacts the image side surface of the first lens; the second spacer element P2 is placed on the image side of the second lens and at least partially contacts the image side surface of the second lens; the third spacer element P3 is placed on the image side of the third lens and at least partially contacts the image side surface of the third lens; the fourth spacer element P4 is placed on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens; the fifth spacer element P5 is placed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; the sixth spacer element P6 is placed on the image side of the sixth lens and at least partially contacts the image side surface of the sixth lens; the seventh spacer element P7 is placed on the image side of the seventh lens and at least partially contacts the image side surface of the seventh lens; the eighth spacer element P8 is placed on the image side of the eighth lens and at least partially contacts the image side surface of the eighth lens.

[0110] Table 6 shows the basic parameter table of the spacer elements of the optical imaging device 1003. The unit of each parameter in Table 6 is millimeter (mm). The above spacer elements can block external redundant light from entering, enable the lens and the lens barrel to better rest against each other, and enhance the structural stability of the optical imaging device 1003.

[0111] Parameter d3m D4s d5s d5m d6s d6m d7s D7s EP56 EP67 L EP34 CP7 Value 3.618 4.682 5.836 5.836 7.499 7.499 8.061 11.275 1.336 0.823 8.463 0.319 0.020

[0112] Table 6

[0113] Figure 3A shows the axial chromatic aberration curves of the optical imaging device 1001 of Example 1, the optical imaging device 1002 of Example 2, and the optical imaging device 1003 of Example 3, which represent the deviation of the convergence points of light rays with different wavelengths after passing through the lens. Figure 3B shows the astigmatism curves of the optical imaging device 1001 of Example 1, the optical imaging device 1002 of Example 2, and the optical imaging device 1003 of Example 3, which represent the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 3C shows the distortion curves of the optical imaging device 1001 of Example 1, the optical imaging device 1002 of Example 2, and the optical imaging device 1003 of Example 3, which represent the distortion magnitude values corresponding to different image heights. Figure 3D shows the longitudinal chromatic aberration curves of the optical imaging device 1001 of Example 1, the optical imaging device 1002 of Example 2, and the optical imaging device 1003 of Example 3, which represent the deviation of different image heights on the imaging plane after the light rays pass through the lens.

[0114] According to Figures 3A to 3DIt can be seen that the optical imaging device 1001 of Embodiment 1, the optical imaging device 1002 of Embodiment 2, and the optical imaging device 1003 of Embodiment 3 can all achieve good imaging quality.

[0115] Example 4

[0116] Figure 4A The structural schematic diagram of the optical imaging device 2001 according to Embodiment 4 of the present application is shown.

[0117] As Figure 4A shown, the optical imaging device 2001 includes a lens barrel P0, a lens group, and a spacer element group. The lens group sequentially 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, a seventh lens E7, and an eighth lens E8. The first lens E1 has an object side surface S1 and an image side surface S2, the second lens E2 has an object side surface S3 and an image side surface S4, the third lens E3 has an object side surface S5 and an image side surface S6, the fourth lens E4 has an object side surface S7 and an image side surface S8, the fifth lens E5 has an object side surface S9 and an image side surface S10, the sixth lens E6 has an object side surface S11 and an image side surface S12, the seventh lens E7 has an object side surface S13 and an image side surface S14, and the eighth lens E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through each surface S1 to S16 and finally forms an image on an imaging surface (not shown).

[0118] Table 7 shows the basic parameter table of the lens group of the optical imaging device 2001 of Embodiment 4, where the units of the radius of curvature, thickness / distance, and effective focal length are all millimeters (mm).

[0119]

[0120]

[0121] Table 7

[0122] Table 8 shows the high-order term coefficients of each aspherical mirror surface that can be used in Embodiment 4, where each aspherical surface type can be defined by the formula (1) given in Embodiment 1 above.

[0123] Surface number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 3.8087E-02 -2.3703E-02 3.9620E-02 -3.8700E-02 7.5812E-04 2.3967E-02 -4.7511E-03 -1.6418E-02 -6.1095E-03 S2 -9.9646E-02 3.2990E-02 9.6630E-03 1.7846E-03 -1.2453E-02 -5.1617E-03 -2.7349E-03 -8.3911E-04 -6.3607E-04 S3 -2.8846E-01 1.1945E-02 -5.7037E-03 3.9645E-03 1.8283E-04 7.4340E-04 3.0317E-05 -3.3904E-05 -8.5089E-05 S4 -3.4102E-01 -9.0832E-03 -8.0585E-03 7.2616E-04 -5.3956E-04 3.1516E-04 1.0019E-04 -2.7005E-05 -3.7493E-05 S5 -1.8325E-01 -1.5752E-02 1.4989E-03 -1.2228E-04 -2.2305E-03 -1.6802E-03 -7.0739E-04 -3.2523E-04 -1.5068E-04 S6 -2.5641E-01 -5.2738E-03 1.2133E-02 -2.1828E-03 1.5568E-03 -3.1028E-03 5.1421E-04 -1.8437E-04 8.3836E-05 S7 -1.6168E-01 1.1871E-01 -4.6836E-02 -3.4915E-02 7.6309E-03 -3.8793E-03 -3.9701E-03 -6.9832E-03 -7.8795E-04 S8 1.5379E-02 1.6313E-01 -8.2697E-02 -2.5023E-03 3.8363E-02 3.1241E-03 -1.3359E-02 -7.2251E-03 -1.9105E-03 S9 3.4122E-01 5.2712E-02 2.4123E-02 1.5504E-02 4.1080E-03 2.9979E-03 2.4186E-04 1.1867E-04 -2.3147E-04 S10 2.8184E-01 -4.4478E-02 1.9397E-02 1.0133E-02 5.4593E-03 2.6820E-03 1.4809E-03 4.8972E-04 4.3433E-04 S11 -8.8250E+00 2.1396E+00 -1.3941E+00 1.8443E-01 -1.2568E-01 5.6667E-02 2.1611E-01 -7.2211E-02 5.2481E-02 S12 -3.1279E+00 7.3008E-01 -2.1109E-01 1.0522E-02 2.1331E-01 1.1210E-02 3.3943E-03 -1.3515E-02 1.6269E-03 S13 -1.4892E-01 -2.5134E-01 2.5754E-01 -1.4464E-01 -1.8519E-02 -1.7927E-02 -4.3982E-03 -5.3698E-03 3.1597E-04 S14 1.2061E+01 -1.4746E+00 -2.2037E+00 3.2227E-01 9.0984E-01 -4.8801E-01 -4.8499E-02 3.1831E-01 2.1249E-01 S15 -3.6233E+00 4.4476E+00 1.1129E+00 1.5567E+00 -4.9894E-01 -6.0417E-01 -3.8948E-02 5.4356E-01 -1.4280E-01 S16 -6.6888E+00 1.0526E+00 -6.1035E-01 1.0327E-01 -1.9833E-01 -2.0504E-03 -5.2024E-02 -1.0345E-02 -2.0427E-02

[0124] Table 8

[0125] Table 9 shows the entrance pupil diameter EPD, effective focal length f, combined focal length f78, and SAG61, Yc61, Yc62, Yc71 of the optical imaging device 2001 of Embodiment 4. The units of each parameter in Table 9 are all millimeters (mm).

[0126] Parameter EPD f f78 SAG61 Yc61 Yc62 Yc71 Value 2.6876 5.2408 -4.0988 -0.1204 1.52 1.58 1.53

[0127] Table 9

[0128] As Figure 4A shown, the optical imaging device 2001 further includes eight spacer elements, namely, a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, a sixth spacer element P6, a seventh spacer element P7, and an eighth spacer element P8. The first spacer element P1 is disposed on the image side of the first lens and is at least partially in contact with the image side surface of the first lens; the second spacer element P2 is disposed on the image side of the second lens and is at least partially in contact with the image side surface of the second lens; the third spacer element P3 is disposed on the image side of the third lens and is at least partially in contact with the image side surface of the third lens; the fourth spacer element P4 is disposed on the image side of the fourth lens and is at least partially in contact with the image side surface of the fourth lens; the fifth spacer element P5 is disposed on the image side of the fifth lens and is at least partially in contact with the image side surface of the fifth lens; the sixth spacer element P6 is disposed on the image side of the sixth lens and is at least partially in contact with the image side surface of the sixth lens; the seventh spacer element P7 is disposed on the image side of the seventh lens and is at least partially in contact with the image side surface of the seventh lens; the eighth spacer element P8 is disposed on the image side of the eighth lens and is at least partially in contact with the image side surface of the eighth lens.

[0129] Table 10 shows the basic parameter table of the spacer elements of the optical imaging device 2001. The unit of each parameter in Table 10 is millimeter (mm). The above spacer elements can block the entry of excess external light, enable the lens and the lens barrel to be better supported, and enhance the structural stability of the optical imaging device 2001.

[0130] Parameter d3m D4s d5s d5m d6s d6m d7s D7s EP56 EP67 L EP34 CP7 Value 3.736 5.549 4.800 4.800 6.308 6.308 7.910 10.955 1.667 1.727 8.110 0.371 0.020

[0131] Table 10

[0132] Example 5

[0133] Figure 4B shows a schematic structural diagram of an optical imaging device 2002 according to Embodiment 5 of the present application.

[0134] As Figure 4B shown, the optical imaging device 2002 includes a lens barrel P0, a lens group, and a spacer element group. The lens group of the optical imaging device 2002 is exactly the same as the lens group of the optical imaging device 2001 in Embodiment 4 and will not be described in detail. The light from the object sequentially passes through each surface S1 to S16 and finally forms an image on an imaging surface (not shown). The basic parameters of the optical imaging device 2002 are shown in detail in Tables 7 to 9 and will not be described in detail.

[0135] As Figure 4BAs shown, the optical imaging device 2002 further includes eight spacer elements, namely a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, a sixth spacer element P6, a seventh spacer element P7, and an eighth spacer element P8. The first spacer element P1 is disposed on the image side of the first lens and is at least partially in contact with the image side surface of the first lens; the second spacer element P2 is disposed on the image side of the second lens and is at least partially in contact with the image side surface of the second lens; the third spacer element P3 is disposed on the image side of the third lens and is at least partially in contact with the image side surface of the third lens; the fourth spacer element P4 is disposed on the image side of the fourth lens and is at least partially in contact with the image side surface of the fourth lens; the fifth spacer element P5 is disposed on the image side of the fifth lens and is at least partially in contact with the image side surface of the fifth lens; the sixth spacer element P6 is disposed on the image side of the sixth lens and is at least partially in contact with the image side surface of the sixth lens; the seventh spacer element P7 is disposed on the image side of the seventh lens and is at least partially in contact with the image side surface of the seventh lens; the eighth spacer element P8 is disposed on the image side of the eighth lens and is at least partially in contact with the image side surface of the eighth lens.

[0136] Table 11 shows the basic parameter table of the spacer elements of the optical imaging device 2002. The unit of each parameter in Table 11 is millimeter (mm). The above spacer elements can block the entry of excess external light, enable the lens and the lens barrel to be better supported, and enhance the structural stability of the optical imaging device 2002.

[0137] Parameter d3m D4s d5s d5m d6s d6m d7s D7s EP56 EP67 L EP34 CP7 Value 3.824 5.637 4.888 4.888 7.944 7.944 8.930 11.043 1.163 1.375 8.110 0.371 0.372

[0138] Table 11

[0139] Example 6

[0140] Figure 4C shows a schematic structural diagram of an optical imaging device 2003 according to Embodiment 6 of the present application.

[0141] As Figure 4C shown, the optical imaging device 2003 includes a lens barrel P0, a lens group, and a spacer element group. The lens group of the optical imaging device 2003 is exactly the same as the lens group of the optical imaging device 2001 in Embodiment 4 and will not be described in detail. The light from the object sequentially passes through each surface S1 to S16 and finally forms an image on an imaging surface (not shown). For the basic parameters of the optical imaging device 2003, please refer to Tables 7 to 9 and will not be described in detail.

[0142] As Figure 4CAs shown in the figure, the optical imaging device 2003 further includes eight spacer elements, namely, a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, a sixth spacer element P6, a seventh spacer element P7, and an eighth spacer element P8. The first spacer element P1 is disposed on the image side of the first lens and is at least partially in contact with the image side surface of the first lens; the second spacer element P2 is disposed on the image side of the second lens and is at least partially in contact with the image side surface of the second lens; the third spacer element P3 is disposed on the image side of the third lens and is at least partially in contact with the image side surface of the third lens; the fourth spacer element P4 is disposed on the image side of the fourth lens and is at least partially in contact with the image side surface of the fourth lens; the fifth spacer element P5 is disposed on the image side of the fifth lens and is at least partially in contact with the image side surface of the fifth lens; the sixth spacer element P6 is disposed on the image side of the sixth lens and is at least partially in contact with the image side surface of the sixth lens; the seventh spacer element P7 is disposed on the image side of the seventh lens and is at least partially in contact with the image side surface of the seventh lens; the eighth spacer element P8 is disposed on the image side of the eighth lens and is at least partially in contact with the image side surface of the eighth lens.

[0143] Table 12 shows the basic parameter table of the spacer elements of the optical imaging device 2003. The unit of each parameter in Table 12 is millimeter (mm). The above spacer elements can block the entry of excessive external light, enable the lens and the lens barrel to be better supported, and enhance the structural stability of the optical imaging device 2003.

[0144] Parameter d3m D4s d5s d5m d6s d6m d7s D7s EP56 EP67 L EP34 CP7 Value 3.637 4.630 4.769 4.769 6.308 6.308 7.100 10.955 1.707 1.727 8.396 0.402 0.020

[0145] Table 12

[0146] Figure 5A shows the axial chromatic aberration curves of the optical imaging device 2001 of Example 4, the optical imaging device 2002 of Example 5, and the optical imaging device 2003 of Example 6, which represent the deviation of the convergence points of light rays with different wavelengths after passing through the lens. Figure 5B shows the astigmatism curves of the optical imaging device 2001 of Example 4, the optical imaging device 2002 of Example 5, and the optical imaging device 2003 of Example 6, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 5C shows the distortion curves of the optical imaging device 2001 of Example 4, the optical imaging device 2002 of Example 5, and the optical imaging device 2003 of Example 6, which represent the distortion magnitude values corresponding to different image heights. Figure 5D shows the longitudinal chromatic aberration curves of the optical imaging device 2001 of Example 4, the optical imaging device 2002 of Example 5, and the optical imaging device 2003 of Example 6, which represent the deviation of different image heights of light rays on the imaging plane after passing through the lens.

[0147] According to Figures 5A to 5DIt can be seen that the optical imaging device 2001 of Embodiment 4, the optical imaging device 2002 of Embodiment 5, and the optical imaging device 2003 of Embodiment 6 can all achieve good imaging quality.

[0148] Example 7

[0149] Figure 6A The structural schematic diagram of the optical imaging device 3001 according to Embodiment 7 of the present application is shown.

[0150] As Figure 6A shown, the optical imaging device 3001 includes a lens barrel P0, a lens group, and a spacer element group. The lens group includes, in order 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, a seventh lens E7, and an eighth lens E8. The first lens E1 has an object side surface S1 and an image side surface S2, the second lens E2 has an object side surface S3 and an image side surface S4, the third lens E3 has an object side surface S5 and an image side surface S6, the fourth lens E4 has an object side surface S7 and an image side surface S8, the fifth lens E5 has an object side surface S9 and an image side surface S10, the sixth lens E6 has an object side surface S11 and an image side surface S12, the seventh lens E7 has an object side surface S13 and an image side surface S14, and the eighth lens E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through each surface S1 to S16 and finally forms an image on an imaging surface (not shown).

[0151] Table 13 shows the basic parameter table of the lens group of the optical imaging device 3001 of Embodiment 7, where the units of the radius of curvature, thickness / distance, and effective focal length are all millimeters (mm).

[0152]

[0153]

[0154] Table 13

[0155] Table 14 shows the high-order term coefficients of the aspherical mirror surfaces that can be used in Embodiment 7, where each aspherical surface type can be defined by the formula (1) given in Embodiment 1 above.

[0156] Surface number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 3.7405E-02 -2.4716E-02 4.2259E-02 -4.1544E-02 1.0572E-03 2.5483E-02 -4.9819E-03 -1.7199E-02 -6.1394E-03 S2 -1.0717E-01 3.5876E-02 1.0027E-02 1.6699E-03 -1.3078E-02 -5.4936E-03 -2.9103E-03 -1.0925E-03 -6.6903E-04 S3 -3.0826E-01 1.2021E-02 -6.5802E-03 3.8948E-03 -8.1521E-05 4.0891E-04 5.5770E-06 1.0426E-05 -2.9913E-05 S4 -3.6469E-01 -9.1680E-03 -8.5200E-03 8.0966E-04 -6.9560E-04 3.0115E-04 3.0404E-04 1.1585E-04 3.0979E-05 S5 -1.9665E-01 -1.6800E-02 2.3122E-03 -4.3150E-04 -2.2446E-03 -1.6457E-03 -2.9436E-04 -1.3181E-04 1.1276E-05 S6 -2.7331E-01 -5.8808E-03 1.2571E-02 -2.4726E-03 1.4481E-03 -3.1886E-03 6.5322E-04 -1.5081E-04 1.1922E-04 S7 -1.7254E-01 1.2646E-01 -4.9250E-02 -3.7440E-02 7.7130E-03 -4.2546E-03 -4.0193E-03 -6.9446E-03 -7.8472E-04 S8 1.1631E-02 1.7815E-01 -8.8734E-02 -2.2443E-03 4.0916E-02 3.3143E-03 -1.4333E-02 -7.5272E-03 -2.1819E-03 S9 3.6944E-01 5.5406E-02 2.5565E-02 1.5938E-02 4.1258E-03 2.8640E-03 1.3385E-04 2.9820E-04 -3.2186E-05 S10 3.0011E-01 -4.6744E-02 2.0954E-02 1.1247E-02 5.9236E-03 3.3139E-03 1.4426E-03 4.7102E-04 2.4127E-04 S11 -1.0164E+01 2.4474E+00 -1.5461E+00 2.2025E-01 -1.4160E-01 6.0892E-02 2.3259E-01 -7.7493E-02 5.6628E-02 S12 -3.4928E+00 8.5157E-01 -2.5687E-01 2.1115E-02 2.2593E-01 1.0204E-02 5.2602E-03 -1.4028E-02 -2.1201E-04 S13 -1.3383E-01 -2.6585E-01 2.4293E-01 -1.5496E-01 -1.6689E-02 -1.8957E-02 -5.0802E-03 -4.8304E-03 8.6087E-04 S14 1.3509E+01 -1.7000E+00 -2.3178E+00 3.4631E-01 9.6692E-01 -5.1459E-01 -5.4621E-02 3.3121E-01 2.2603E-01 S15 -3.8675E+00 4.7793E+00 1.0939E+00 1.7494E+00 -5.9192E-01 -6.1687E-01 -5.6331E-02 5.6805E-01 -1.4837E-01 S16 -7.1436E+00 1.0346E+00 -6.6142E-01 7.2447E-02 -1.9487E-01 -4.7747E-03 -4.4734E-02 -8.8528E-03 -7.1071E-03

[0157] Table 14

[0158] Table 15 shows the entrance pupil diameter EPD, effective focal length f, combined focal length f78, and SAG61, Yc61, Yc62, Yc71 of the optical imaging device 3001 of Embodiment 7. The units of the parameters in Table 15 are all millimeters (mm).

[0159] Parameter EPD f f78 SAG61 Yc61 Yc62 Yc71 Value 2.8520 5.5614 -5.3534 -0.1841 1.57 1.60 1.52

[0160] Table 15

[0161] As Figure 6A shown, the optical imaging device 3001 further includes eight spacer elements, namely a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, a sixth spacer element P6, a seventh spacer element P7, and an eighth spacer element P8. The first spacer element P1 is disposed on the image side of the first lens and at least partially contacts the image side surface of the first lens; the second spacer element P2 is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens; the third spacer element P3 is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens; the fourth spacer element P4 is disposed on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens; the fifth spacer element P5 is disposed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; the sixth spacer element P6 is disposed on the image side of the sixth lens and at least partially contacts the image side surface of the sixth lens; the seventh spacer element P7 is disposed on the image side of the seventh lens and at least partially contacts the image side surface of the seventh lens; the eighth spacer element P8 is disposed on the image side of the eighth lens and at least partially contacts the image side surface of the eighth lens.

[0162] Table 16 shows the basic parameter table of the spacer elements of the optical imaging device 3001. The unit of each parameter in Table 16 is millimeter (mm). The above spacer elements can block the entry of excess external light, enable the lens and the lens barrel to better bear against each other, and enhance the structural stability of the optical imaging device 3001.

[0163] Parameter d3m D4s d5s d5m d6s d6m d7s D7s EP56 EP67 L EP34 CP7 Value 3.769 7.315 4.783 4.783 6.113 6.113 7.578 10.443 1.649 1.704 8.084 0.374 0.020

[0164] Table 16

[0165] Example 8

[0166] Figure 6B shows a schematic structural diagram of an optical imaging device 3002 according to Embodiment 8 of the present application.

[0167] As Figure 6B shown, the optical imaging device 3002 includes a lens barrel P0, a lens group, and a spacer element group. The lens group of the optical imaging device 3002 is exactly the same as the lens group of the optical imaging device 3001 in Embodiment 7 and will not be described in detail. Light from an object sequentially passes through each surface S1 to S16 and finally forms an image on an imaging surface (not shown). The basic parameters of the optical imaging device 3002 are shown in detail in Tables 13 to 15 and will not be described in detail.

[0168] As Figure 6BAs shown, the optical imaging device 3002 further includes eight spacer elements, namely a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, a sixth spacer element P6, a seventh spacer element P7, and an eighth spacer element P8. The first spacer element P1 is disposed on the image side of the first lens and at least partially contacts the image side surface of the first lens; the second spacer element P2 is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens; the third spacer element P3 is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens; the fourth spacer element P4 is disposed on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens; the fifth spacer element P5 is disposed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; the sixth spacer element P6 is disposed on the image side of the sixth lens and at least partially contacts the image side surface of the sixth lens; the seventh spacer element P7 is disposed on the image side of the seventh lens and at least partially contacts the image side surface of the seventh lens; the eighth spacer element P8 is disposed on the image side of the eighth lens and at least partially contacts the image side surface of the eighth lens.

[0169] Table 17 shows the basic parameter table of the spacer elements of the optical imaging device 3002. The unit of each parameter in Table 17 is millimeter (mm). The above spacer elements can block the entry of excess external light, enable the lens and the lens barrel to be better supported, and enhance the structural stability of the optical imaging device 3002.

[0170] Parameter d3m D4s d5s d5m d6s d6m d7s D7s EP56 EP67 L EP34 CP7 Value 3.769 7.315 4.622 4.622 5.836 5.836 8.100 10.443 1.505 1.569 8.084 0.374 0.568

[0171] Table 17

[0172] Example 9

[0173] Figure 6C shows a schematic structural diagram of an optical imaging device 3003 according to Embodiment 9 of the present application.

[0174] As Figure 6C shown, the optical imaging device 3003 includes a lens barrel P0, a lens group, and a spacer element group. The lens group of the optical imaging device 3003 is exactly the same as the lens group of the optical imaging device 3001 in Embodiment 7 and will not be described in detail. Light from an object sequentially passes through each surface S1 to S16 and finally forms an image on an imaging surface (not shown). The basic parameters of the optical imaging device 3003 are shown in detail in Tables 13 to 15 and will not be described in detail.

[0175] As Figure 6CAs shown, the optical imaging device 3003 further includes eight spacer elements, namely a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, a sixth spacer element P6, a seventh spacer element P7, and an eighth spacer element P8. The first spacer element P1 is disposed on the image side of the first lens and is at least partially in contact with the image side surface of the first lens; the second spacer element P2 is disposed on the image side of the second lens and is at least partially in contact with the image side surface of the second lens; the third spacer element P3 is disposed on the image side of the third lens and is at least partially in contact with the image side surface of the third lens; the fourth spacer element P4 is disposed on the image side of the fourth lens and is at least partially in contact with the image side surface of the fourth lens; the fifth spacer element P5 is disposed on the image side of the fifth lens and is at least partially in contact with the image side surface of the fifth lens; the sixth spacer element P6 is disposed on the image side of the sixth lens and is at least partially in contact with the image side surface of the sixth lens; the seventh spacer element P7 is disposed on the image side of the seventh lens and is at least partially in contact with the image side surface of the seventh lens; the eighth spacer element P8 is disposed on the image side of the eighth lens and is at least partially in contact with the image side surface of the eighth lens.

[0176] Table 18 shows the basic parameter table of the spacer elements of the optical imaging device 3003. The unit of each parameter in Table 18 is millimeter (mm). The above spacer elements can block the entry of excess external light, enable the lens and the lens barrel to be better supported, and enhance the structural stability of the optical imaging device 3003.

[0177] Parameter d3m D4s d5s d5m d6s d6m d7s D7s EP56 EP67 L EP34 CP7 Value 3.769 5.511 4.622 4.622 5.836 5.836 8.100 10.443 1.505 1.572 8.084 0.327 0.568

[0178] Table 18

[0179] Figure 7A shows the axial chromatic aberration curves of the optical imaging device 3001 of Example 7, the optical imaging device 3002 of Example 8, and the optical imaging device 3003 of Example 9, which represent the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 7B shows the astigmatism curves of the optical imaging device 3001 of Example 7, the optical imaging device 3002 of Example 8, and the optical imaging device 3003 of Example 9, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 7C shows the distortion curves of the optical imaging device 3001 of Example 7, the optical imaging device 3002 of Example 8, and the optical imaging device 3003 of Example 9, which represent the distortion magnitude values corresponding to different image heights. Figure 7D shows the longitudinal chromatic aberration curves of the optical imaging device 3001 of Example 7, the optical imaging device 3002 of Example 8, and the optical imaging device 3003 of Example 9, which represent the deviation of different image heights of light rays on the imaging plane after passing through the lens.

[0180] According to Figures 7A to 7DIt can be seen that the optical imaging devices 3001 of Embodiment 7, the optical imaging devices 3002 of Embodiment 8, and the optical imaging devices 3003 of Embodiment 9 can all achieve good imaging quality.

[0181] In summary, the optical imaging devices of Embodiments 1 to 9 satisfy the relationships shown in Table 19.

[0182] Conditional formula / Example 1 2 3 4 5 6 7 8 9 |f8 / f| 1.85 1.85 1.85 1.85 1.85 1.85 2.79 2.79 2.79 f8 / (R15 + R16) -1.19 -1.19 -1.19 -1.20 -1.20 -1.20 -2.06 -2.06 -2.06 (EP67 + CP7) / T78 0.93 0.93 0.93 1.97 1.97 1.97 1.91 2.37 2.37 EP56 / CT6 1.96 1.96 1.74 2.23 1.55 2.28 2.06 1.88 1.88 f78 / d7s -0.52 -0.52 -0.52 -0.52 -0.46 -0.58 -0.71 -0.66 -0.66 d5s / EPD × |f5 / R9| 4.70 4.91 4.90 3.83 3.90 3.80 3.56 3.44 3.44 L / Dr10r15 × |f8 / f7| 2.63 2.63 2.68 2.63 2.63 2.72 3.65 3.65 3.65 d3m / (CT3 + T34) 16.64 17.47 16.59 17.54 17.96 17.08 16.58 16.58 16.58 EP56 / (T56 + |SAG61|) 4.60 4.60 4.09 5.71 3.99 5.85 4.49 4.10 4.10 (D4s - d3m) / EP34 4.74 8.04 3.33 4.89 4.89 2.47 9.49 9.49 5.33 d6s / Yc62 3.97 3.97 4.63 3.99 5.03 3.99 3.82 3.65 3.65 d6m / Yc71 4.09 4.09 4.78 4.12 5.19 4.12 4.02 3.84 3.84 EP56 / Yc61 0.97 0.97 0.86 1.10 0.77 1.12 1.05 0.96 0.96 (N7 × R13) / EP67 -11.31 -11.31 -11.31 -5.26 -6.61 -5.26 -5.77 -6.27 -6.26 (d6s - d5m) / (f5 - f) 0.40 0.27 0.79 0.73 1.49 0.75 0.62 0.56 0.56 D4s / |f4 - f5| 4.39 5.53 3.84 4.66 4.74 3.89 5.81 5.81 4.38

[0183] Table 19

[0184] The present application also provides an imaging device, the electronic photosensitive element of which may be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor element (CMOS). The imaging device may be an independent imaging device such as a digital camera, or an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging device described above.

[0185] The above description is only a preferred embodiment of the present application and an explanation of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solutions formed by the 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 inventive concept. For example, the technical solutions formed by mutually replacing the above features with the (but not limited to) technical features having similar functions disclosed in the present application.

Claims

1. An optical imaging device, characterized in that: Comprising: A lens barrel, and a lens group and a spacer element group disposed within the lens barrel, wherein, The lens group sequentially includes, from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, wherein the first lens, the fourth lens, and the fifth lens all have positive optical powers, and the second lens, the third lens, the sixth lens, the seventh lens, and the eighth lens all have negative optical powers; The spacer element group includes: a sixth spacer element and a seventh spacer element, wherein the sixth spacer element is disposed between the sixth lens and the seventh lens and at least partially contacts the image side surface of the sixth lens, and the seventh spacer element is disposed between the seventh lens and the eighth lens and at least partially contacts the image side surface of the seventh lens; The optical imaging device satisfies: 1.8 < |f8 / f| < 2.8, -2.10 < f8 / (R15 + R16) < -1.15, and 0.9 < (EP67 + CP7) / T78 < 2.4, where f8 is the effective focal length of the eighth lens, f is the effective focal length of the optical imaging device, R15 is the curvature radius of the object side surface of the eighth lens, R16 is the curvature radius of the image side surface of the eighth lens, EP67 is the axial spacing distance between the image side surface of the sixth spacer element and the object side surface of the seventh spacer element, CP7 is the thickness of the seventh spacer element along the optical axis, and T78 is the air spacing between the seventh lens and the eighth lens on the optical axis; The number of lenses with optical power in the optical imaging device is eight.

2. The optical imaging device according to claim 1, wherein The spacer element group further includes: a fifth spacer element disposed between the fifth lens and the sixth lens and at least partially contacting the image side surface of the fifth lens; The optical imaging device satisfies: 1.5 < EP56 / CT6 < 2.3, where EP56 is the axial spacing distance between the image side surface of the fifth spacer element and the object side surface of the sixth spacer element, and CT6 is the central thickness of the sixth lens on the optical axis.

3. The optical imaging device according to claim 1, wherein The optical imaging device satisfies: -0.75 < f78 / d7s < -0.42, where f78 is the combined focal length of the seventh lens and the eighth lens, and d7s is the inner diameter of the object side surface of the seventh spacer element in a direction perpendicular to the optical axis.

4. The optical imaging device according to claim 1, characterized in that: The spacer element group further includes: a fifth spacer element disposed between the fifth lens and the sixth lens and at least partially contacting the image side surface of the fifth lens; The optical imaging device satisfies: 3.4 < d5s / EPD × |f5 / R9| < 4.95, where d5s is the inner diameter of the object side surface of the fifth spacer element in the direction perpendicular to the optical axis, EPD is the entrance pupil diameter of the optical imaging device, f5 is the effective focal length of the fifth lens, and R9 is the radius of curvature of the object side surface of the fifth lens.

5. The optical imaging device according to claim 1, wherein The optical imaging device satisfies: 2.6 < L / Dr10r15 × |f8 / f7| < 3.7, where L is the maximum distance along the optical axis from the object side end surface of the lens barrel to the image side end surface of the lens barrel, Dr10r15 is the distance on the optical axis from the image side surface of the fifth lens to the object side surface of the eighth lens, f7 is the effective focal length of the seventh lens, and f8 is the effective focal length of the eighth lens.

6. The optical imaging device according to claim 1, characterized in that: The spacer element group further includes: a third spacer element disposed between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens; The optical imaging device satisfies: 16.55 < d3m / (CT3 + T34) < 18, where d3m is the inner diameter of the image side surface of the third spacer element in the direction perpendicular to the optical axis, CT3 is the central thickness of the third lens on the optical axis, and T34 is the air gap between the third lens and the fourth lens on the optical axis.

7. The optical imaging device according to claim 1, wherein The spacer element group further includes: a fifth spacer element disposed between the fifth lens and the sixth lens and at least partially in contact with the image side surface of the fifth lens; The optical imaging device satisfies: 3.95 < EP56 / (T56 + |SAG61|) < 5.9, where EP56 is the spacing distance along the optical axis between the image side surface of the fifth spacer element and the object side surface of the sixth spacer element, T56 is the air gap between the fifth lens and the sixth lens on the optical axis, and SAG61 is the axial distance from the intersection of the object side surface of the sixth lens and the optical axis to the vertex of the effective radius of the object side surface of the sixth lens.

8. The optical imaging device according to any one of claims 1 - 5, wherein The spacer element group further includes: a third spacer element and a fourth spacer element, the third spacer element is disposed between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens, and the fourth spacer element is disposed between the fourth lens and the fifth lens and at least partially in contact with the image side surface of the fourth lens; The optical imaging device satisfies: 2.45 < (D4s - d3m) / EP34 < 9.5, where D4s is the outer diameter of the object side surface of the fourth spacer element in the direction perpendicular to the optical axis, d3m is the inner diameter of the image side surface of the third spacer element in the direction perpendicular to the optical axis, and EP34 is the distance between the image side surface of the third spacer element and the object side surface of the fourth spacer element along the optical axis.

9. The optical imaging device according to any one of claims 1-7, characterized in that The optical imaging device satisfies: 3.6 < d6s / Yc62 < 5.05, where d6s is the outer diameter of the object side surface of the sixth spacer element in the direction perpendicular to the optical axis, and Yc62 is the perpendicular distance from the inflection point closest to the vertex of the effective radius of the image side surface of the sixth lens to the optical axis.

10. The optical imaging device according to any one of claims 1-7, characterized in that The optical imaging device satisfies: 3.8 < d6m / Yc71 < 5.2, where d6m is the inner diameter of the image side surface of the sixth spacer element in the direction perpendicular to the optical axis, and Yc71 is the perpendicular distance from the inflection point closest to the vertex of the effective radius of the object side surface of the seventh lens to the optical axis.

11. The optical imaging device according to any one of claims 1, 3, 5, 6, characterized in that The spacer element group further includes: a fifth spacer element, which is disposed between the fifth lens and the sixth lens and is at least partially in contact with the image side surface of the fifth lens; The optical imaging device satisfies: 0.75 < EP56 / Yc61 < 1.15, where EP56 is the distance between the image side surface of the fifth spacer element and the object side surface of the sixth spacer element along the optical axis, and Yc61 is the perpendicular distance from the inflection point closest to the vertex of the effective radius of the object side surface of the sixth lens to the optical axis.

12. The optical imaging device according to any one of claims 1-7, characterized in that The optical imaging device satisfies: -11.35 < (N7 × R13) / EP67 < -5.25, where N7 is the refractive index of the seventh lens, R13 is the curvature radius of the object side surface of the seventh lens, and EP67 is the distance between the image side surface of the sixth spacer element and the object side surface of the seventh spacer element along the optical axis.

13. The optical imaging device according to any one of claims 1, 3, 5, 6, characterized in that The spacer element group further includes: a fifth spacer element, which is disposed between the fifth lens and the sixth lens and is at least partially in contact with the image side surface of the fifth lens; The optical imaging device satisfies: 0.25 < (d6s - d5m) / (f5 - f) < 1.5, where d6s is the inner diameter of the object side surface of the sixth spacer element in the direction perpendicular to the optical axis, d5m is the inner diameter of the image side surface of the fifth spacer element in the direction perpendicular to the optical axis, f5 is the effective focal length of the fifth lens, and f is the effective focal length of the optical imaging device.

14. The optical imaging device according to any one of claims 1 to 7, characterized in that: The spacer element group further includes: a fourth spacer element disposed between the fourth lens and the fifth lens and at least partially in contact with the image side surface of the fourth lens; The optical imaging device satisfies: 3.8 < D4s / |f4 - f5| < 5.85, where D4s is the outer diameter of the object side surface of the fourth spacer element in the direction perpendicular to the optical axis, f4 is the effective focal length of the fourth lens, and f5 is the effective focal length of the fifth lens.

Images