Optical imaging device

Abstract

The application discloses an optical imaging device, which comprises a lens barrel, a seven-piece lens group and a spacer group arranged in the lens barrel; the seven-piece lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens, the first lens, the fifth lens and the sixth lens have positive focal lengths, and the second lens and the seventh lens have negative focal lengths; the spacer group comprises a first spacer, a second spacer, a sixth spacer and a seventh spacer; wherein the inner diameter d1s of the object side surface of the first spacer and the inner diameter d2s of the object side surface of the second spacer satisfy d1s > d2s; the inner diameter d6m of the image side surface of the sixth spacer, the inner diameter d7m of the image side surface of the seventh spacer and the radius of curvature R14 of the image side surface of the seventh lens satisfy 0.63 ≤ (d7m-d6m) / R14 ≤ 1.04.

Description

[0001] Divisional application

[0002] This application is a divisional application of Chinese invention patent application filed on December 13, 2023, entitled "Optical Imaging Device" and with application number 202311710674.6. Technical Field

[0003] This application relates to the field of optical devices, specifically to a seven-element optical imaging device. Background Technology

[0004] As users demand higher image quality, the number of lenses in imaging lenses is gradually increasing. Increasing the number of lenses in an imaging lens helps to improve its imaging effect, color reproduction, light-gathering power, and resolution.

[0005] Seven-element imaging lenses have become the mainstream, but they also present greater challenges to optical performance and assembly stability. For example, if the air gap between any two adjacent lenses (from the fifth to the seventh element) on the optical axis is too small, it can lead to scratches and breakage during reliability testing. However, increasing the air gap between any two adjacent lenses on the optical axis significantly impacts the assembly stability of the imaging lens. Therefore, a more optimized imaging lens design is needed to ensure both assembly yield and performance yield. Summary of the Invention

[0006] This application provides an optical imaging device that can at least solve or partially solve at least one problem or other problems existing in the prior art.

[0007] One aspect of this application provides an optical imaging device comprising a lens barrel and a seven-lens group and a spacer group disposed within the lens barrel. The seven-lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged sequentially along the optical axis from the object side to the image side. The first, fifth, and sixth lenses have positive optical power, while the second and seventh lenses have negative optical power. The spacer group includes a first spacer, a second spacer, a sixth spacer, and a seventh spacer. The first spacer is disposed on and in contact with the image side of the first lens; the second spacer is disposed on and in contact with the image side of the second lens; the sixth spacer is disposed on and in contact with the image side of the sixth lens; and the seventh spacer is disposed on and in contact with the image side of the seventh lens. The inner diameter d1s of the object side of the first spacer and the inner diameter d2s of the object side of the second spacer satisfy: d1s>d2s; the inner diameter d6m of the image side of the sixth spacer, the inner diameter d7m of the image side of the seventh spacer and the radius of curvature R14 of the image side of the seventh lens satisfy: 0.63≤(d7m-d6m) / R14≤1.04.

[0008] According to an exemplary embodiment of this application, the combined focal length f67 of the sixth and seventh lenses, the length L of the lens barrel in the direction of the optical axis, and the maximum field of view (FOV) of the optical imaging device satisfy: -4.37≤f67 / (L×tan(FOV))<-0.90.

[0009] According to an exemplary embodiment of this application, the length L of the lens barrel in the direction of the optical axis, the center thickness CT6 of the sixth lens on the optical axis, the air gap T67 between the sixth and seventh lenses on the optical axis, and the center thickness CT7 of the seventh lens on the optical axis satisfy: 3.10 <L / (CT6+T67+CT7)<3.40。

[0010] According to an exemplary embodiment of this application, the inner diameter d0s of the object-side end face of the lens barrel and the inner diameter d1s of the object-side side face of the first spacer satisfy: 1.20 <d0s / d1s≤1.60。

[0011] According to an exemplary embodiment of this application, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the inner diameter d2m of the image side of the second spacer, and the outer diameter D2m of the image side of the second spacer satisfy: 3.63≤|f1×f2| / (d2m×D2m)≤10.32.

[0012] According to an exemplary embodiment of this application, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the inner diameter d1s of the object side of the first spacer, and the outer diameter D2s of the object side of the second spacer satisfy: 0.04≤d1s / f1+D2s / f2<0.40.

[0013] According to an exemplary embodiment of this application, the spacer assembly further includes a third spacer disposed on and in contact with the image-side surface of the third lens. The effective focal length f3 of the third lens, the inner diameter d3s of the object-side surface of the third spacer, and the outer diameter D3s of the object-side surface of the third spacer satisfy the following: -0.10mm ≤ D3s × d3s / f3 < 0.40mm.

[0014] According to an exemplary embodiment of this application, the spacer assembly further includes a third spacer disposed on and in contact with the image-side surface of the third lens. The effective focal length f3 of the third lens, the radius of curvature R6 of the image-side surface of the third lens, the inner diameter d3m of the image-side surface of the third spacer, and the spacing EP23 of the second and third spacers along the optical axis satisfy: -0.93 ≤ f3 / R6 / (d3m / EP23) < 0.10.

[0015] According to an exemplary embodiment of this application, the spacer assembly further includes a third spacer disposed on and in contact with the image-side surface of the third lens. The spacing EP12 between the first and second spacers along the optical axis, the spacing EP23 between the second and third spacers along the optical axis, and the air spacing T23 between the second and third lenses along the optical axis satisfy the following condition: 0.20 < (EP12 - EP23) / T23 ≤ 0.60.

[0016] According to an exemplary embodiment of this application, the spacer group further includes a fourth spacer disposed on and in contact with the image side of the fourth lens and a fifth spacer disposed on and in contact with the image side of the fifth lens. Among them, the air gap T56 between the fifth and sixth lenses on the optical axis and the air gap T67 between the sixth and seventh lenses on the optical axis satisfy: 1.70≤T67 / T56<2.30; the air gap T45 between the fourth and fifth lenses on the optical axis, the air gap T56 between the fifth and sixth lenses on the optical axis, the gap EP45 between the fourth and fifth spacers along the optical axis and the gap EP56 between the fifth and sixth spacers along the optical axis satisfy: EP56 / T56>EP45 / T45; the inner diameter d0m of the image-side end face of the lens barrel, the inner diameter d5m of the image-side face of the fifth spacer, the gap EP56 between the fifth and sixth spacers along the optical axis and the center thickness CT6 of the sixth lens on the optical axis satisfy: 6.00<(d0m-d5m) / (EP56-CT6)≤13.86.

[0017] According to an exemplary embodiment of the present application, the spacer group further includes a fourth spacer disposed on the image side surface of the fourth lens and in contact with the image side surface of the fourth lens, and a fifth spacer disposed on the image side surface of the fifth lens and in contact with the image side surface of the fifth lens. Among them, the radius of curvature R8 of the image side surface of the fourth lens, the radius of curvature R9 of the object side surface of the fifth lens, the inner diameter d4s of the object side surface of the fourth spacer, and the inner diameter d5s of the object side surface of the fifth spacer satisfy: 2.94 ≤ |R9 / R8| / (d5s / d4s) ≤ 14.71.

[0018] According to an exemplary embodiment of the present application, the spacer group further includes a third spacer disposed on the image side surface of the third lens and in contact with the image side surface of the third lens, and a fourth spacer disposed on the image side surface of the fourth lens and in contact with the image side surface of the fourth lens. Among them, the effective focal length f5 of the fifth lens, the refractive index N5 of the fifth lens, the outer diameter D3s of the object side surface of the third spacer, and the outer diameter D4s of the object side surface of the fourth spacer satisfy: 2.30 ≤ (f5 × N5) / (D4s + D3s) < 6.40.

[0019] According to an exemplary embodiment of the present application, the spacer group further includes a third spacer disposed on the image side surface of the third lens and in contact with the image side surface of the third lens, a fourth spacer disposed on the image side surface of the fourth lens and in contact with the image side surface of the fourth lens, and a fifth spacer disposed on the image side surface of the fifth lens and in contact with the image side surface of the fifth lens. Among them, the interval EP34 between the third spacer and the fourth spacer along the optical axis, the interval EP45 between the fourth spacer and the fifth spacer along the optical axis, the central thickness CT4 of the fourth lens on the optical axis, and the central thickness CT5 of the fifth lens on the optical axis satisfy: 0.90 < (EP34 + EP45) / (CT4 + CT5) ≤ 1.34.

[0020] According to an exemplary embodiment of the present application, the spacer group further includes a fifth spacer disposed on the image side surface of the fifth lens and in contact with the image side surface of the fifth lens. Among them, the air interval T56 between the fifth lens and the sixth lens on the optical axis and the interval EP56 between the fifth spacer and the sixth spacer along the optical axis satisfy: 2.40 < EP56 / T56 < 3.90; the inner diameter d0m of the image side end face of the lens barrel, the inner diameter d6m of the image side surface of the sixth spacer, the interval EP56 between the fifth spacer and the sixth spacer along the optical axis, and the air interval T67 between the sixth lens and the seventh lens on the optical axis satisfy: 3.28 ≤ (d0m - d6m) / (EP56 - T67) < 9.7. Description of the Drawings

[0021] Other features, objects, and advantages of the present application will become more apparent by reading the following detailed description of non - restrictive embodiments with reference to the accompanying drawings, in which:

[0022] Figure 1A A schematic diagram of the structure of the optical imaging device according to this application is shown;

[0023] Figure 1B A schematic diagram of the stress distribution of each lens is shown when the optical imaging device according to this application satisfies (d0m-d5m) / (EP56-CT6)=9.59;

[0024] Figure 1C A schematic diagram of the stress distribution of each lens is shown when the optical imaging device according to this application satisfies (d0m-d5m) / (EP56-CT6)=15.5;

[0025] Figure 1D A schematic diagram of the stress distribution of each lens is shown when the optical imaging device according to this application satisfies (d0m-d5m) / (EP56-CT6)=5.5;

[0026] Figure 1E A schematic diagram of the stress distribution of each lens is shown when the optical imaging device according to this application satisfies (d0m-d6m) / (EP56-T67)=7.19;

[0027] Figure 1F A schematic diagram of the stress distribution of each lens is shown when the optical imaging device according to this application satisfies (d0m-d6m) / (EP56-T67)=10;

[0028] Figure 1G A schematic diagram of the stress distribution of each lens is shown when the optical imaging device according to this application satisfies (d0m-d6m) / (EP56-T67)=3;

[0029] Figure 2 A schematic diagram of the structure of an optical imaging device according to Embodiment 1 of this application is shown;

[0030] Figure 3 A schematic diagram of the structure of an optical imaging device according to Embodiment 2 of this application is shown;

[0031] Figure 4 A schematic diagram of the structure of an optical imaging device according to Embodiment 3 of this application is shown;

[0032] Figures 5A to 5C The on-axis chromatic aberration curves, astigmatism curves, and distortion curves of the optical imaging apparatus according to Embodiments 1, 2, or 3 of this application are shown respectively.

[0033] Figure 6 A schematic diagram of the structure of an optical imaging device according to Embodiment 4 of this application is shown;

[0034] Figure 7A schematic diagram of the structure of an optical imaging device according to Embodiment 5 of this application is shown;

[0035] Figure 8 A schematic diagram of the structure of an optical imaging device according to Embodiment 6 of this application is shown;

[0036] Figures 9A to 9C The on-axis chromatic aberration curves, astigmatism curves, and distortion curves of the optical imaging apparatus according to embodiments 4, 5, or 6 of this application are shown respectively.

[0037] Figure 10 A schematic diagram of the structure of an optical imaging device according to Embodiment 7 of this application is shown;

[0038] Figure 11 A schematic diagram of the structure of an optical imaging device according to Embodiment 8 of this application is shown;

[0039] Figure 12 A schematic diagram of the structure of an optical imaging device according to Embodiment 9 of this application is shown; and

[0040] Figures 13A to 13C The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging device according to Embodiments 7, 8, or 9 of this application are shown respectively. Detailed Implementation

[0041] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements.

[0042] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply 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.

[0043] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not drawn strictly to scale.

[0044] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity 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 location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0045] It should also be understood that the terms "comprising" and / or "having," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0046] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formalized sense, unless expressly so specified herein.

[0047] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0048] Figure 1A This is a structural layout diagram and a schematic diagram of some parameters of an optical imaging device according to an exemplary embodiment of this application. (Reference) Figure 1Ad1s represents the inner diameter of the object-side surface of the first spacer, d2m represents the inner diameter of the image-side surface of the second spacer, D2s represents the outer diameter of the object-side surface of the second spacer, D2m represents the outer diameter of the image-side surface of the second spacer, d3s represents the inner diameter of the object-side surface of the third spacer, d3m represents the inner diameter of the image-side surface of the third spacer, D3s represents the outer diameter of the object-side surface of the third spacer, d4s represents the inner diameter of the object-side surface of the fourth spacer, D4s represents the outer diameter of the object-side surface of the fourth spacer, d5s represents the inner diameter of the object-side surface of the fifth spacer, d5m represents the inner diameter of the image-side surface of the fifth spacer, d6 m represents the inner diameter of the image-side surface of the sixth spacer, d7m represents the inner diameter of the image-side surface of the seventh spacer, d0s represents the inner diameter of the object-side end face of the lens barrel, d0m represents the inner diameter of the image-side end face of the lens barrel, EP12 represents the spacing between the first and second spacers along the optical axis, EP23 represents the spacing between the second and third spacers along the optical axis, EP34 represents the spacing between the third and fourth spacers along the optical axis, EP45 represents the spacing between the fourth and fifth spacers along the optical axis, EP56 represents the spacing between the fifth and sixth spacers along the optical axis, and L represents the length of the lens barrel in the direction of the optical axis.

[0049] refer to Figures 2 to 4 , Figures 6 to 8 as well as Figures 10 to 12 The first aspect of this application provides an optical imaging device that may include a seven-lens group, which may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged sequentially along the optical axis from the object side to the image side. An air gap may exist between any two adjacent lenses, from the first lens to the seventh lens.

[0050] In an exemplary embodiment, the first lens may have positive optical power, its object-side surface may be convex, and its image-side surface may be concave. The second lens may have negative optical power, its object-side surface may be convex, and its image-side surface may be concave. The third lens may have either positive or negative optical power, its object-side surface may be convex or concave, and its image-side surface may be convex or concave. The fourth lens may have either positive or negative optical power, its object-side surface may be convex, and its image-side surface may be concave. The fifth lens may have positive optical power, its object-side surface may be convex or concave, and its image-side surface may be convex. The sixth lens may have positive optical power, its object-side surface may be convex, and its image-side surface may be concave. The seventh lens may have negative optical power, its object-side surface may be convex, and its image-side surface may be concave.

[0051] In an exemplary embodiment, the optical imaging device may further include a group of spacers, which may include one or more of a first spacer, a second spacer, a third spacer, a fourth spacer, a fifth spacer, a sixth spacer, and a seventh spacer. The first spacer may be positioned on the image-side surface of a first lens and at least partially in contact with it. The second spacer may be positioned on the image-side surface of a second lens and at least partially in contact with it. The third spacer may be positioned on the image-side surface of a third lens and at least partially in contact with it. The fourth spacer may be positioned on the image-side surface of a fourth lens and at least partially in contact with it. The fifth spacer may be positioned on the image-side surface of a fifth lens and at least partially in contact with it. The sixth spacer may be positioned on the image-side surface of a sixth lens and at least partially in contact with it. The seventh spacer may be positioned on the image-side surface of a seventh lens and at least partially in contact with it. Proper use of spacers can effectively mitigate stray light risks, reduce interference with image quality, and thus improve the imaging quality of the optical imaging device.

[0052] In an exemplary embodiment, the optical imaging device may further include a lens barrel, with a seven-element lens group and a spacer group disposed within the lens barrel. The lens barrel may include an object-side end face, an image-side end face, an outer ring surface, and an inner ring surface, wherein the end face of the lens barrel closest to the object side is the object-side end face of the lens barrel, and the end face of the lens barrel closest to the image side is the image-side end face of the lens barrel; in a direction perpendicular to the optical axis, the surface of the lens barrel furthest from the optical axis is the outer ring surface, and the surface of the lens barrel closest to the optical axis is the inner ring surface. Furthermore, the inner ring surface of the lens barrel is stepped.

[0053] In an exemplary embodiment, the air gap T56 between the fifth lens and the sixth lens on the optical axis and the air gap T67 between the sixth lens and the seventh lens on the optical axis may satisfy: 1.60 < T67 / T56 < 2.30; the air gap T45 between the fourth lens and the fifth lens on the optical axis, the air gap T56 between the fifth lens and the sixth lens on the optical axis, the interval EP45 between the fourth spacer and the fifth spacer along the optical axis and the interval EP56 between the fifth spacer and the sixth spacer along the optical axis may satisfy: EP56 / T56 > EP45 / T45; the inner diameter d0m of the image-side end face of the lens barrel, the inner diameter d5m of the image-side face of the fifth spacer, the interval EP56 between the fifth spacer and the sixth spacer along the optical axis and the central thickness CT6 of the sixth lens on the optical axis may satisfy: 6.00 < (d0m - d5m) / (EP56 - CT6) < 14.00. By controlling the optical imaging device to satisfy "1.60 < T67 / T56 < 2.30" and "EP56 / T56 > EP45 / T45", the air gap between any two adjacent lenses among the fifth lens to the seventh lens on the optical axis can be effectively increased, avoiding problems such as abrasion and breakage in the reliability test of the optical imaging device. However, at the same time, it will also result in a relatively large distance between the assembly bearing position of the sixth lens and the center of the sixth lens along the optical axis, and abnormal phenomena such as assembly tilt and deformation are likely to occur during the assembly of the sixth lens, affecting the assembly stability of the optical imaging device. Therefore, by controlling the mutual relationship between the inner diameter of the image-side end face of the lens barrel, the inner diameter of the image-side face of the fifth spacer, the interval between the fifth spacer and the sixth spacer along the optical axis, and the central thickness of the sixth lens on the optical axis, it is possible to ensure that the distance between the assembly bearing position of the sixth lens and the center of the sixth lens along the optical axis is within a reasonable range, avoiding abnormal phenomena such as assembly tilt and deformation during the assembly of the sixth lens, and effectively improving the assembly stability of the optical imaging device.

[0054] Figure 1B shows a schematic diagram of the stress distribution of each lens when (d0m - d5m) / (EP56 - CT6) of the optical imaging device is 9.59, that is, when the optical imaging device satisfies 6.00 < (d0m - d5m) / (EP56 - CT6) < 14.00. When the optical imaging device does not satisfy 6.00 < (d0m - d5m) / (EP56 - CT6) < 14.00, for example Figure 1C shows a schematic diagram of the stress distribution of each lens under the condition that EP56 = 1.24 mm and (d0m - d5m) / (EP56 - CT6) = 15.5 of the optical imaging device; and for example Figure 1D shows a schematic diagram of the stress distribution of each lens under the condition that d5m = 9.57 mm and (d0m - d5m) / (EP56 - CT6) = 5.5 of the optical imaging device. In Figures 1B to 1D , the darker the color, the greater the stress existing in the lens. From Figure 1C and Figure 1D From the perspective of Figure 1D , when (d0m - d5m) / (EP56 - CT6) = 15.5 or (d0m - d5m) / (EP56 - CT6) = 5.5, the distance between the assembly bearing position of the sixth lens and the center of the sixth lens along the optical axis is relatively large, which will cause obvious stress concentration at the assembly bearing position of the sixth lens. When assembling the sixth lens, abnormal problems such as assembly tilt and deformation are likely to occur, resulting in poor assembly stability of the optical imaging device. From Figure 1B From the perspective of Figure 1B , when (d0m - d5m) / (EP56 - CT6) = 9.59, the distance between the assembly bearing position of the sixth lens and the center of the sixth lens along the optical axis is relatively small, which is beneficial to reducing the stress concentration at the assembly bearing position of the sixth lens and improving the assembly stability of the optical imaging device. It can be seen that when the optical imaging device satisfies "6.00 < (d0m - d5m) / (EP56 - CT6) < 14.00", it is beneficial to improve the assembly stability of the optical imaging device.

[0055] In an exemplary embodiment, the air gap T56 between the fifth lens and the sixth lens on the optical axis and the interval EP56 between the fifth spacer and the sixth spacer along the optical axis may satisfy: 2.40 < EP56 / T56 < 3.90; the inner diameter d0m of the image-side end face of the lens barrel, the inner diameter d6m of the image-side face of the sixth spacer, the interval EP56 between the fifth spacer and the sixth spacer along the optical axis, and the air gap T67 between the sixth lens and the seventh lens on the optical axis may satisfy: 3.20 < (d0m - d6m) / (EP56 - T67) < 9.70. By restricting the ratio of the interval between the fifth spacer and the sixth spacer along the optical axis to the air gap between the fifth lens and the sixth lens on the optical axis within the range of 2.40 to 3.90, it is beneficial to avoid abrasion of the fifth lens and the sixth lens during tests such as mechanical shock and drop collision. However, at the same time, it will cause a relatively large interval between the fifth spacer and the sixth spacer along the optical axis, resulting in abnormal phenomena such as assembly tilt and deformation of the sixth lens during assembly, affecting the assembly stability of the optical imaging device. Therefore, by controlling the mutual relationship between the inner diameter of the image-side end face of the lens barrel, the inner diameter of the image-side face of the sixth spacer, the interval between the fifth spacer and the sixth spacer along the optical axis, and the air gap between the sixth lens and the seventh lens on the optical axis, it is possible to ensure that the interval between the fifth spacer and the sixth spacer along the optical axis is within a reasonable range, avoid abnormal phenomena such as assembly tilt and deformation of the sixth lens during assembly, and effectively improve the assembly stability of the optical imaging device.

[0056] Figure 1EThe diagram shows the stress distribution of each lens in an optical imaging device when (d0m-d6m) / (EP56-T67) = 7.19, i.e., the optical imaging device satisfies 3.20 < (d0m-d6m) / (EP56-T67) < 9.70. When the optical imaging device does not satisfy 3.20 < (d0m-d6m) / (EP56-T67) < 9.70, for example... Figure 1F A schematic diagram of the stress distribution of each lens in an optical imaging device is shown under the conditions of EP56 / T56 = 2.29 and (d0m-d6m) / (EP56-T67) = 10; and, for example... Figure 1G This diagram illustrates the stress distribution of each lens in an optical imaging device under the conditions of EP56 / T56 = 3.2 and (d0m - d6m) / (EP56 - T67) = 3. Figures 1E to 1F In general, the darker the color, the greater the stress on the lens. From... Figure 1F and Figure 1G As can be seen, when (d0m-d6m) / (EP56-T67) = 10 or (d0m-d6m) / (EP56-T67) = 3, the spacing between the fifth and sixth spacers along the optical axis is relatively large. This leads to significant stress concentration at the assembly support position of the sixth lens, making it prone to abnormal problems such as tilting and deformation during assembly, resulting in poor assembly stability of the optical imaging device. From Figure 1E As can be seen, when (d0m-d6m) / (EP56-T67)=7.19, the spacing between the fifth and sixth spacers along the optical axis is relatively small, which helps to reduce stress concentration at the assembly bearing position of the sixth lens and improve the assembly stability of the optical imaging device. Therefore, when the optical imaging device satisfies “3.20<(d0m-d6m) / (EP56-T67)<9.70”, it is beneficial to improve the assembly stability of the optical imaging device.

[0057] In an exemplary embodiment, the radius of curvature R8 of the image-side surface of the fourth lens, the radius of curvature R9 of the object-side surface of the fifth lens, the inner diameter d4s of the object-side surface of the fourth spacer, and the inner diameter d5s of the object-side surface of the fifth spacer can satisfy: 2.50 < |R9 / R8| / (d5s / d4s) < 15.00. By controlling the relationship between the radius of curvature of the image-side surface of the fourth lens, the radius of curvature of the object-side surface of the fifth lens, the inner diameter of the object-side surface of the fourth spacer, and the inner diameter of the object-side surface of the fifth spacer, it is possible to control the deflection angle of the light on the image-side surface of the fourth lens and the object-side surface of the fifth lens, while constraining the deflection angle of the light on the image-side surface of the fourth lens and the object-side surface of the fifth lens. This effectively improves the tolerance distance of the optical imaging device within a certain range and reduces the sensitivity of the optical imaging device.

[0058] In an exemplary embodiment, the combined focal length f67 of the sixth lens and the seventh lens, the length L of the lens barrel in the direction of the optical axis, and the maximum field angle FOV of the optical imaging device may satisfy: -4.50 < f67 / (L × tan(FOV)) < -0.90. By controlling the mutual relationship among the combined focal length of the sixth lens and the seventh lens, the length of the lens barrel in the direction of the optical axis, and the maximum field angle of the optical imaging device, while reducing the size of the optical imaging device, the combined focal length of the sixth lens and the seventh lens and the maximum field angle of the optical imaging device can be constrained within a reasonable range, ensuring that the optical imaging device has good optical performance, and the optical imaging device is easier to be processed by injection molding and assembled stably.

[0059] In an exemplary embodiment, the length L of the lens barrel in the direction of the optical axis, the central thickness CT6 of the sixth lens on the optical axis, the air gap T67 between the sixth lens and the seventh lens on the optical axis, and the central thickness CT7 of the seventh lens on the optical axis may satisfy: 3.10 < L / (CT6 + T67 + CT7) < 3.40. By constraining the ratio of the length of the lens barrel in the direction of the optical axis to the axial distance from the object side surface of the sixth lens to the image side surface of the seventh lens within a reasonable range, it is beneficial to realize the miniaturized design of the optical imaging device.

[0060] In an exemplary embodiment, the inner diameter d0s of the object side end face of the lens barrel and the inner diameter d1s of the object side surface of the first spacer may satisfy: 1.20 < d0s / d1s < 1.70. The optical imaging device needs to have sufficient light passing amount to obtain the required depth of field and illuminance. By constraining the ratio of the inner diameter of the object side end face of the lens barrel to the inner diameter of the object side surface of the first spacer within a reasonable range, the light incident amount of the optical imaging device can be effectively guaranteed, and further the overall image quality of the optical imaging device can be improved.

[0061] In an exemplary embodiment, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the inner diameter d2m of the image side surface of the second spacer, and the outer diameter D2m of the image side surface of the second spacer may satisfy: 3.50 < |f1 × f'style="font-family: Arial, sans-serif;">2| / (d2m × D2m) < 10.50. The curvature degrees of different lenses are different for the ability to photograph near and far of different lenses. By controlling the mutual relationship among the effective focal length of the first lens, the effective focal length of the second lens, and the inner and outer diameters of the image side surface of the second spacer, the light intensity and light incident amount of the off-axis field can be constrained, the rationality of the structure can be guaranteed, the occupied space of the lens in the lens barrel can be reduced, it is beneficial to adapt to different optical imaging devices, and at the same time, the positive axial aberration part can be paired and corrected to improve the imaging quality of the optical imaging device.

[0062] In an exemplary embodiment, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the inner diameter d1s of the object side surface of the first spacer, and the outer diameter D2s of the object side surface of the second spacer satisfy: 0.04 ≤ d1s / f1 + D2s / f2 < 0.40. By controlling the interrelationship among the effective focal length of the first lens, the effective focal length of the second lens, the inner diameter of the object side surface of the first spacer, and the outer diameter of the object side surface of the second spacer, the distance between the center axes of the second lens and each lens can be reduced during the assembly process, the consistency of the optical axes of each lens can be ensured, and the imaging quality of the optical imaging device can be improved. During the assembly process, the smaller the deviation of the optical axes of each lens, the higher the imaging quality of the optical imaging device.

[0063] In an exemplary embodiment, the effective focal length f3 of the third lens, the inner diameter d3s of the object side surface of the third spacer, and the outer diameter D3s of the object side surface of the third spacer may satisfy: -0.10 mm ≤ D3s × d3s / f3 < 0.40 mm. By controlling the inner and outer diameters of the object side surface of the third spacer, the stability of the effective focal length of the third lens can be improved within a certain range, the precision during the assembly process of the optical imaging device can be increased, the center axis distance error between lenses can be reduced, and the imaging quality of the optical imaging device can be improved.

[0064] In an exemplary embodiment, the effective focal length f3 of the third lens, the radius of curvature R6 of the image side surface of the third lens, the inner diameter d3m of the image side surface of the third spacer, and the interval EP23 between the second spacer and the third spacer along the optical axis may satisfy: -1.00 < f3 / R6 / (d3m / EP23) < 0.10. By controlling the radius of curvature of the image side surface of the third lens and the effective focal length of the third lens, the aberration of the front lens can be controlled, so that the aberration of the optical imaging device meets the design requirements; at the same time, by controlling the interval between the second spacer and the third spacer along the optical axis, the edge thickness of the third lens can be constrained within a reasonable range, making it show a good state in terms of the stability of the structure and assembly.

[0065] In an exemplary embodiment, the interval EP12 between the first spacer and the second spacer along the optical axis, the interval EP23 between the second spacer and the third spacer along the optical axis, and the air interval T23 between the second lens and the third lens on the optical axis may satisfy: 0.20 < (EP12 - EP23) / T23 < 0.70. By controlling the interrelationship among the interval between the first spacer and the second spacer along the optical axis, the interval between the second spacer and the third spacer along the optical axis, and the air interval between the second lens and the third lens on the optical axis, while ensuring the light passing amount of the light, the balance of lens aberration can be controlled, and the imaging quality of the optical imaging device can be adjusted by adjusting the air interval, ensuring that the imaging of the light meets the requirements.

[0066] In an exemplary embodiment, the effective focal length f5 of the fifth lens, the refractive index N5 of the fifth lens, the outer diameter D3s of the object-side surface of the third spacer, and the outer diameter D4s of the object-side surface of the fourth spacer can satisfy: 2.20 < (f5 × N5) / (D4s + D3s) < 6.40. By controlling the relationship between the effective focal length of the fifth lens, the refractive index of the fifth lens, the outer diameter of the object-side surface of the third spacer, and the outer diameter of the object-side surface of the fourth spacer, the molding and assembly appearance can be guaranteed, enabling the optical imaging device to meet the system performance requirements within a certain focal length and ensuring the assembly stability of the optical imaging device.

[0067] In an exemplary embodiment, the spacing EP34 between the third and fourth spacers along the optical axis, the spacing EP45 between the fourth and fifth spacers along the optical axis, the center thickness CT4 of the fourth lens along the optical axis, and the center thickness CT5 of the fifth lens along the optical axis can satisfy: 0.90 < (EP34 + EP45) / (CT4 + CT5) < 1.40. By controlling the relationships between the spacing between the third and fourth spacers along the optical axis, the spacing between the fourth and fifth spacers along the optical axis, the center thickness of the fourth lens along the optical axis, and the center thickness of the fifth lens along the optical axis, the light intake of the optical imaging device can be guaranteed to meet the requirements, and the structure of the optical imaging device can be more compact and more stable.

[0068] In an exemplary embodiment, the inner diameter d6m of the image-side surface of the sixth spacer, the inner diameter d7m of the image-side surface of the seventh spacer, and the radius of curvature R14 of the image-side surface of the seventh lens can satisfy: 0.50 < (d7m - d6m) / R14 < 1.10. By controlling the radius of curvature of the image-side surface of the seventh lens, the light angle of the edge field of view can be kept within a reasonable range, effectively reducing the sensitivity of the optical imaging device. At the same time, by matching the appropriate inner diameters of the image-side surfaces of the sixth and seventh spacers, off-axis aberrations can be effectively corrected, improving the imaging performance of the optical imaging device.

[0069] In an exemplary embodiment, the optical imaging device may further include an aperture disposed between the object side and the first lens.

[0070] The optical imaging device according to the above embodiments of this application can employ seven lenses and at least one spacer. By rationally allocating the parameters of each lens and each spacer, miniaturization of the optical imaging device can be achieved, stray light phenomena in the optical imaging device can be improved, and the assembly stability and imaging quality of the optical imaging device can be enhanced.

[0071] In an embodiment of the present application, at least one of the surfaces of each of the first lens to the seventh lens is an aspherical surface. The characteristic of an aspherical lens is that the curvature changes continuously from the center of the lens to the periphery of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and improving astigmatism aberration. After using an aspherical lens, it is possible to eliminate the aberration that appears during imaging as much as possible, thereby improving the imaging quality. Optionally, both the object side surface and the image side surface of each of the first lens to the seventh lens are aspherical surfaces.

[0072] A second aspect of the present application provides an optical imaging device, which includes a lens barrel and a seven-piece lens group and a spacer group disposed in the lens barrel. The seven-piece lens group may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in sequence from the object side to the image side along the optical axis. The spacer group may include a first spacer disposed on the image side surface of the first lens and in contact with the image side surface of the first lens, a second spacer disposed on the image side surface of the second lens and in contact with the image side surface of the second lens, a sixth spacer disposed on the image side surface of the sixth lens and in contact with the image side surface of the sixth lens, and a seventh spacer disposed on the image side surface of the seventh lens and in contact with the image side surface of the seventh lens.

[0073] The inner diameter d1s of the object side surface of the first spacer and the inner diameter d2s of the object side surface of the second spacer may satisfy: d1s > d2s; the effective focal length f1 of the first lens and the total effective focal length f of the optical imaging device may satisfy: f1 / f > 1.10; the inner diameter d6m of the image side surface of the sixth spacer, the inner diameter d7m of the image side surface of the seventh spacer, and the curvature radius R14 of the image side surface of the seventh lens may satisfy: 0.50 < (d7m - d6m) / R14 < 1.10. In an example, 1.10 < f1 / f < 1.50. When the optical imaging device satisfies "d1s > d2s, f1 / f > 1.10", the curvature radius of the object side surface of the first lens is larger, which makes the object side surface of the first lens tend to be spherical or planar, and the deflection angle of the light on the object side surface of the first lens is smaller, thereby reducing the sensitivity coefficient of the first lens and reducing the relative illumination (Relative Illumination, RI) of the optical imaging device. Therefore, by controlling the mutual relationship between the inner diameter of the image side surface of the sixth spacer, the inner diameter of the image side surface of the seventh spacer, and the curvature radius of the image side surface of the seventh lens, the light angle of the edge field of view can be within a reasonable range, improving the relative illumination of the edge field of view. At the same time, the inner diameters of the image side surfaces of the sixth spacer and the seventh spacer are within a reasonable range, which can effectively correct off-axis aberration and improve the imaging device of the optical imaging device.

[0074] The third aspect of the present application provides an optical imaging device, which includes a lens barrel, a seven-piece lens group and a spacer group disposed within the lens barrel. The seven-piece lens group may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens arranged in sequence from the object side to the image side along the optical axis. The first lens, the fifth lens and the sixth lens have positive optical powers, and the second lens and the seventh lens have negative optical powers. The spacer group may include a fifth spacer disposed on the image side surface of the fifth lens and in contact with the image side surface of the fifth lens, and a sixth spacer disposed on the image side surface of the sixth lens and in contact with the image side surface of the sixth lens.

[0075] The air gap T56 between the fifth lens and the sixth lens on the optical axis and the gap EP56 between the fifth spacer and the sixth spacer along the optical axis may satisfy: 2.40 < EP56 / T56 < 3.90; the inner diameter d0m of the image-side end face of the lens barrel, the inner diameter d6m of the image-side surface of the sixth spacer, the gap EP56 between the fifth spacer and the sixth spacer along the optical axis and the air gap T67 between the sixth lens and the seventh lens on the optical axis may satisfy: 3.20 < (d0m - d6m) / (EP56 - T67) < 9.70. By constraining the ratio of the gap between the fifth spacer and the sixth spacer along the optical axis to the air gap between the fifth lens and the sixth lens on the optical axis within the range of 2.40 to 3.90, it is beneficial to avoid abrasion of the fifth lens and the sixth lens during tests such as mechanical shock and drop collision. However, at the same time, it will result in a relatively large gap between the fifth spacer and the sixth spacer along the optical axis, thus causing abnormal phenomena such as assembly tilt and deformation of the sixth lens during assembly, affecting the assembly stability of the optical imaging device. Therefore, by controlling the mutual relationship among the inner diameter of the image-side end face of the lens barrel, the inner diameter of the image-side surface of the sixth spacer, the gap between the fifth spacer and the sixth spacer along the optical axis, and the air gap between the sixth lens and the seventh lens on the optical axis, it is possible to ensure that the gap between the fifth spacer and the sixth spacer along the optical axis is within a reasonable range, avoid abnormal phenomena such as assembly tilt and deformation of the sixth lens during assembly, and effectively improve the assembly stability of the optical imaging device.

[0076] Figure 1E Shows the stress distribution schematic diagram of each lens when the optical imaging device satisfies (d0m - d6m) / (EP56 - T67) = 7.19, that is, when the optical imaging device satisfies 3.20 < (d0m - d6m) / (EP56 - T67) < 9.70. When the optical imaging device does not satisfy 3.20 < (d0m - d6m) / (EP56 - T67) < 9.70, for example Figure 1F Shows the stress distribution schematic diagram of each lens under the conditions of EP56 / T56 = 2.29 and (d0m - d6m) / (EP56 - T67) = 10 for the optical imaging device; and for example Figure 1GThis diagram illustrates the stress distribution of each lens in an optical imaging device under the conditions of EP56 / T56 = 3.2 and (d0m - d6m) / (EP56 - T67) = 3. Figures 1E to 1F In general, the darker the color, the greater the stress on the lens. From... Figure 1F and Figure 1G As can be seen, when (d0m-d6m) / (EP56-T67) = 10 or (d0m-d6m) / (EP56-T67) = 3, the spacing between the fifth and sixth spacers along the optical axis is relatively large. This leads to significant stress concentration at the assembly support position of the sixth lens, making it prone to abnormal problems such as tilting and deformation during assembly, resulting in poor assembly stability of the optical imaging device. From Figure 1E As can be seen, when (d0m-d6m) / (EP56-T67)=7.19, the spacing between the fifth and sixth spacers along the optical axis is relatively small, which helps to reduce stress concentration at the assembly bearing position of the sixth lens and improve the assembly stability of the optical imaging device. Therefore, when the optical imaging device satisfies “3.20<(d0m-d6m) / (EP56-T67)<9.70”, it is beneficial to improve the assembly stability of the optical imaging device.

[0077] Those skilled in the art will understand that, without departing from the technical solutions claimed in this application, the number of lenses and spacers constituting the optical imaging device can be changed to obtain the various results and advantages described in this specification.

[0078] Specific embodiments of the optical imaging apparatus applicable to the above-described embodiments are further described below with reference to the accompanying drawings.

[0079] Example 1

[0080] The following is for reference Figure 2 This application describes an optical imaging apparatus according to Embodiment 1.

[0081] like Figure 2As shown, the optical imaging device 100 includes a lens barrel and a seven-lens group and a spacer group disposed within the lens barrel. The seven-lens group includes, sequentially from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. An aperture stop STO may be disposed between the object side and the first lens E1. The spacer group includes a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a sixth spacer P6, and a seventh spacer P7. The spacer group also includes a fourth auxiliary spacer P4b disposed on the image side side of the fourth spacer P4 and at least partially in contact with the image side side of the fourth spacer P4. The spacers can block excess light from entering the next lens during the imaging process, while also allowing the lens to better support the lens barrel, thus enhancing the structural stability of the optical imaging device.

[0082] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being concave and its image-side surface S6 being convex. The fourth lens E4 has negative optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has positive optical power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The seventh lens E7 has negative optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The filter has an object-side surface S15 (not shown) and an image-side surface S16 (not shown). Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged onto imaging surface S17 (not shown).

[0083] Table 1 shows the basic parameters of the optical imaging device of Example 1, where the units for radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0084]

[0085] Table 1

[0086] In this embodiment, the total effective focal length f of the optical imaging device is 6.87 mm, the maximum field of view (FOV) of the optical imaging device is 78.90°, and the combined focal length f67 of the sixth and seventh lenses is -179.79 mm.

[0087] In this embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces, and the surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0088]

[0089] Where x is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 gives the higher-order coefficients A4, A6, A8, A14 that can be used for each aspherical surface S1-S14 in Example 1. 10 A 12 A 14 A 16 A 18 A 20 and A 22 .

[0090]

[0091]

[0092] Table 2

[0093] Example 2

[0094] The following is for reference Figure 3 Describes an optical imaging apparatus according to Embodiment 2 of this application.

[0095] like Figure 3 As shown, the optical imaging device 200 includes a lens barrel and a seven-lens group and a spacer group disposed within the lens barrel. The seven-lens group, arranged sequentially along the optical axis from the object side to the image side, includes: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. An aperture stop STO can be disposed between the object side and the first lens E1. The spacer group includes a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a sixth spacer P6, and a seventh spacer P7. The spacers prevent excess light from entering the next lens during the imaging process, while also ensuring better contact between the lens and the lens barrel, thus enhancing the structural stability of the optical imaging device.

[0096] The lens structure in this embodiment is the same as that in Embodiment 1. That is, the basic parameter table of the optical imaging device in this embodiment is the same as Table 1, and the aspherical coefficient table is the same as Table 2. The difference between this embodiment and Embodiment 1 lies in the structural dimensions of the lens barrel, the first spacer P1, the second spacer P2, the third spacer P3, the fourth spacer P4, the fifth spacer P5, the sixth spacer P6, and the seventh spacer P7. For example, parameters such as d1s, d2m, D2s, D2m, d3s, d3m, D3s, d4s, D4s, d5s, d5m, d6m, d7m, d0s, d0m, EP12, EP23, EP34, EP45, EP56, and L are different.

[0097] Example 3

[0098] The following is for reference Figure 4 This application describes an optical imaging apparatus according to Embodiment 3.

[0099] like Figure 4 As shown, the optical imaging device 300 includes a lens barrel and a seven-lens group and a spacer group disposed within the lens barrel. The seven-lens group includes, sequentially from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. An aperture stop STO can be disposed between the object side and the first lens E1. The spacer group includes a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a sixth spacer P6, and a seventh spacer P7. The spacer group also includes a fifth auxiliary spacer P5b disposed on the image side side of the fifth spacer P5 and at least partially in contact with the image side side of the fifth spacer P5. The spacers can block excess light during the imaging process from entering the next lens, while also allowing the lens to better support the lens and the lens barrel, thus enhancing the structural stability of the optical imaging device.

[0100] The lens structure in this embodiment is the same as that in Embodiment 1. That is, the basic parameter table of the optical imaging device in this embodiment is the same as Table 1, and the aspherical coefficient table is the same as Table 2. The difference between this embodiment and Embodiment 1 lies in the structural dimensions of the lens barrel, the first spacer P1, the second spacer P2, the third spacer P3, the fourth spacer P4, the fifth spacer P5, the sixth spacer P6, and the seventh spacer P7. For example, parameters such as d1s, d2m, D2s, D2m, d3s, d3m, D3s, d4s, D4s, d5s, d5m, d6m, d7m, d0s, d0m, EP12, EP23, EP34, EP45, EP56, and L are different.

[0101] Figure 5AThe on-axis chromatic aberration curves of the optical imaging devices of Embodiments 1, 2, and 3 are shown, which represent the deviation of the focal point of light of different wavelengths after passing through the optical imaging device. Figure 5B The astigmatism curves of the optical imaging devices of Examples 1, 2, and 3 are shown, which represent the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Figure 5C The distortion curves of the optical imaging devices in Examples 1, 2, and 3 are shown, representing the distortion magnitude values ​​corresponding to different image heights. According to... Figures 5A to 5C It can be seen that the optical imaging devices given in Examples 1, 2, and 3 can achieve good imaging quality.

[0102] Example 4

[0103] The following is for reference Figure 6 The optical imaging apparatus according to Embodiment 4 of this application is described.

[0104] like Figure 6 As shown, the optical imaging device 400 includes a lens barrel and a seven-lens group and a spacer group disposed within the lens barrel. The seven-lens group, arranged sequentially along the optical axis from the object side to the image side, includes: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. An aperture stop STO can be disposed between the object side and the first lens E1. The spacer group includes a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a sixth spacer P6, and a seventh spacer P7. The spacers prevent excess light from entering the next lens during the imaging process, while also ensuring better contact between the lens and the lens barrel, thus enhancing the structural stability of the optical imaging device.

[0105] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has negative optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being convex. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The seventh lens E7 has negative optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The filter has an object-side surface S15 (not shown) and an image-side surface S16 (not shown). Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged onto imaging surface S17 (not shown).

[0106] Table 3 shows the basic parameters of the optical imaging device of Example 4, where the units for radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0107]

[0108]

[0109] Table 3

[0110] In this embodiment, the total effective focal length f of the optical imaging device is 6.90 mm, the maximum field of view (FOV) of the optical imaging device is 81.97°, and the combined focal length f67 of the sixth and seventh lenses is -85.49 mm.

[0111] In this embodiment, the object-side surface and image-side surface of any one of the lenses, from the first lens E1 to the seventh lens E7, are aspherical. Table 4 shows the higher-order coefficients A4, A6, A8, and A6 that can be used for the aspherical surfaces S1-S14 in Embodiment 4. 10 A 12 A 14 A 16 A 18 A 20 and A 22 .

[0112] Face number A4 A6 A8 A10 A12 S1 1.73E-01 1.77E-02 2.21E-03 -1.06E-04 -4.89E-05 S2 1.33E+01 -3.03E-02 9.90E-03 -8.05E-04 1.02E-03 S3 7.78E+00 -1.76E-01 1.89E-02 -1.31E-03 2.48E-04 S4 1.47E+00 -7.97E-02 1.94E-02 4.69E-03 1.62E-03 S5 -9.66E+00 -1.26E-01 -1.15E-02 4.19E-03 9.46E-04 S6 9.80E+01 -2.27E-01 -9.27E-03 -1.62E-04 -4.45E-04 S7 -6.67E+01 -4.14E-01 -1.08E-02 1.05E-03 4.72E-04 S8 -2.62E-01 -4.93E-01 2.99E-02 1.37E-02 4.22E-03 S9 3.06E+01 -2.23E-01 7.38E-02 1.69E-02 -6.93E-03 S10 1.07E+01 -8.19E-01 2.13E-01 1.31E-02 -4.92E-03 S11 -3.45E-02 -2.71E+00 -2.48E-01 6.27E-02 1.95E-02 S12 3.68E+00 -1.24E+00 -1.46E-01 2.00E-01 -9.13E-02 S13 -6.63E-01 -4.09E+00 1.72E+00 -7.18E-01 2.46E-01 S14 -4.90E+00 -3.27E+00 1.05E+00 -3.23E-01 1.45E-01 Face number A14 A16 A18 A20 A22 S1 4.57E-05 1.38E-05 1.53E-05 1.11E-05 8.79E-06 S2 -3.73E-04 -1.20E-04 -3.46E-05 2.11E-05 3.11E-05 S3 -6.30E-04 -2.52E-04 -7.93E-05 -1.97E-05 1.43E-05 S4 3.28E-04 3.06E-05 -3.75E-07 -1.05E-05 4.69E-07 S5 -4.82E-04 -2.09E-04 -1.17E-04 -8.91E-07 -1.16E-05 S6 -1.25E-03 -3.10E-04 -7.58E-05 2.20E-06 3.26E-05 S7 4.84E-05 9.64E-05 1.32E-04 7.37E-06 2.78E-05 S8 1.31E-03 4.05E-04 2.13E-04 1.11E-05 5.16E-05 S9 -4.46E-03 9.18E-04 9.17E-04 -4.49E-05 -2.85E-05 S10 -7.77E-03 -2.18E-03 1.39E-03 7.94E-04 2.65E-04 S11 1.31E-02 3.17E-03 3.02E-04 -8.64E-04 -2.07E-04 S12 1.60E-02 4.06E-03 3.94E-03 7.26E-04 1.39E-04 S13 -6.25E-02 1.73E-02 -9.88E-03 5.09E-03 -1.55E-03 S14 -5.65E-02 8.71E-03 -5.19E-03 7.91E-03 -4.16E-03

[0113] Table 4

[0114] Example 5

[0115] The following is for reference Figure 7 This application describes an optical imaging apparatus according to Embodiment 5.

[0116] like Figure 7 As shown, the optical imaging device 500 includes a lens barrel and a seven-lens group and a spacer group disposed within the lens barrel. The seven-lens group includes, sequentially from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. An aperture stop STO may be disposed between the object side and the first lens E1. The spacer group includes a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a sixth spacer P6, and a seventh spacer P7. The spacer group also includes a fifth auxiliary spacer P5b disposed on the image side side of the fifth spacer P5 and at least partially in contact with the image side side of the fifth spacer P5. The spacers can block excess light during the imaging process from entering the next lens, while also allowing the lens to better support the lens barrel, thus enhancing the structural stability of the optical imaging device.

[0117] The lens structure in this embodiment is the same as that in Embodiment 4. That is, the basic parameter table of the optical imaging device in this embodiment is the same as Table 3, and the aspherical coefficient table is the same as Table 4. The difference between this embodiment and Embodiment 4 lies in the structural dimensions of the lens barrel, the first spacer P1, the second spacer P2, the third spacer P3, the fourth spacer P4, the fifth spacer P5, the sixth spacer P6, and the seventh spacer P7. For example, parameters such as d1s, d2m, D2s, D2m, d3s, d3m, D3s, d4s, D4s, d5s, d5m, d6m, d7m, d0s, d0m, EP12, EP23, EP34, EP45, EP56, and L are different.

[0118] Example 6

[0119] The following is for reference Figure 8 This application describes an optical imaging apparatus according to Embodiment 6.

[0120] like Figure 8 As shown, the optical imaging device 600 includes a lens barrel and a seven-lens group and a spacer group disposed within the lens barrel. The seven-lens group, arranged sequentially along the optical axis from the object side to the image side, includes: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. An aperture stop STO can be disposed between the object side and the first lens E1. The spacer group includes a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a sixth spacer P6, and a seventh spacer P7. The spacers prevent excess light from entering the next lens during the imaging process, while also ensuring better contact between the lens and the lens barrel, thus enhancing the structural stability of the optical imaging device.

[0121] The lens structure in this embodiment is the same as that in Embodiment 4. That is, the basic parameter table of the optical imaging device in this embodiment is the same as Table 3, and the aspherical coefficient table is the same as Table 4. The difference between this embodiment and Embodiment 4 lies in the structural dimensions of the lens barrel, the first spacer P1, the second spacer P2, the third spacer P3, the fourth spacer P4, the fifth spacer P5, the sixth spacer P6, and the seventh spacer P7. For example, parameters such as d1s, d2m, D2s, D2m, d3s, d3m, D3s, d4s, D4s, d5s, d5m, d6m, d7m, d0s, d0m, EP12, EP23, EP34, EP45, EP56, and L are different.

[0122] Figure 9A The on-axis chromatic aberration curves of the optical imaging devices of embodiments 4, 5, and 6 are shown, which represent the deviation of the focal point of light of different wavelengths after passing through the optical imaging device. Figure 9BAstigmatism curves of the optical imaging devices of Examples 4, 5, and 6 are shown, representing the meridional and sagittal image plane curvatures corresponding to different image heights. Figure 9C The distortion curves of the optical imaging devices in Examples 4, 5, and 6 are shown, representing the distortion magnitude values ​​corresponding to different image heights. According to... Figures 9A to 9C It can be seen that the optical imaging devices given in Examples 4, 5, and 6 can achieve good imaging quality.

[0123] Example 7

[0124] The following is for reference Figure 10 The optical imaging apparatus according to Embodiment 7 of this application is described.

[0125] like Figure 10 As shown, the optical imaging device 700 includes a lens barrel and a seven-lens group and a spacer group disposed within the lens barrel. The seven-lens group, arranged sequentially along the optical axis from the object side to the image side, includes: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. An aperture stop STO can be disposed between the object side and the first lens E1. The spacer group includes a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a sixth spacer P6, and a seventh spacer P7. The spacers prevent excess light from entering the next lens during the imaging process, while also ensuring better contact between the lens and the lens barrel, thus enhancing the structural stability of the optical imaging device.

[0126] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has positive optical power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The seventh lens E7 has negative optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The filter has an object-side surface S15 (not shown) and an image-side surface S16 (not shown). Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged onto imaging surface S17 (not shown).

[0127] Table 5 shows the basic parameters of the optical imaging device of Example 7, where the units for radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0128]

[0129] Table 5

[0130] In this embodiment, the total effective focal length f of the optical imaging device is 6.91 mm, the maximum field of view (FOV) of the optical imaging device is 81.89°, and the combined focal length f67 of the sixth and seventh lenses is -56.26 mm.

[0131] In this embodiment, the object-side surface and image-side surface of any one of the lenses, from the first lens E1 to the seventh lens E7, are aspherical. Table 6 shows the higher-order coefficients A4, A6, A8, and A6 that can be used for each aspherical surface S1-S14 in Embodiment 7. 10 A 12 A 14 A 16 A 18 A 20 and A 22 .

[0132] Face number A4 A6 A8 A10 A12 S1 1.64E-01 1.56E-02 1.59E-03 -3.50E-04 -1.12E-04 S2 1.25E+01 -3.30E-02 1.06E-02 -8.35E-04 9.38E-04 S3 7.80E+00 -1.74E-01 2.04E-02 -1.03E-03 2.48E-04 S4 1.50E+00 -7.81E-02 1.89E-02 4.60E-03 1.53E-03 S5 9.80E+01 -1.23E-01 -1.21E-02 4.32E-03 1.03E-03 S6 -9.80E+01 -2.36E-01 -7.27E-03 -5.32E-04 1.52E-04 S7 -5.25E+01 -4.12E-01 -1.21E-02 1.32E-03 5.17E-04 S8 5.31E-01 -4.89E-01 3.08E-02 1.44E-02 3.74E-03 S9 -9.80E+01 -2.13E-01 7.38E-02 1.66E-02 -7.25E-03 S10 1.09E+01 -8.16E-01 2.13E-01 1.39E-02 -4.51E-03 S11 -3.73E-02 -2.71E+00 -2.46E-01 5.58E-02 1.80E-02 S12 2.28E+00 -1.26E+00 -1.50E-01 2.02E-01 -9.29E-02 S13 -6.32E-01 -4.08E+00 1.72E+00 -7.17E-01 2.45E-01 S14 -5.09E+00 -3.23E+00 1.04E+00 -3.23E-01 1.49E-01

[0133] Face number A14 A16 A18 A20 A22 S1 1.52E-05 1.42E-06 2.07E-05 1.94E-05 1.24E-05 S2 -2.99E-04 -1.17E-04 -5.20E-05 2.74E-05 2.11E-05 S3 -5.57E-04 -2.21E-04 -8.83E-05 -7.78E-07 1.18E-05 S4 2.99E-04 3.50E-05 -7.76E-06 -9.97E-06 1.11E-06 S5 -3.69E-04 -2.14E-04 -8.08E-05 -5.69E-06 -6.06E-06 S6 -1.07E-03 -2.92E-04 -5.36E-05 -1.76E-06 3.05E-05 S7 -7.05E-05 4.04E-05 1.00E-04 1.35E-05 2.21E-05 S8 1.23E-03 4.37E-04 2.16E-04 1.76E-05 4.56E-05 S9 -4.33E-03 7.60E-04 7.95E-04 -2.57E-05 3.18E-06 S10 -8.40E-03 -2.58E-03 1.12E-03 7.22E-04 2.78E-04 S11 1.23E-02 2.27E-03 2.57E-04 -6.97E-04 -1.30E-04 S12 1.38E-02 2.40E-03 4.91E-03 3.79E-04 1.56E-04 S13 -6.32E-02 1.77E-02 -9.75E-03 5.00E-03 -1.44E-03 S14 -5.71E-02 7.53E-03 -5.35E-03 7.79E-03 -3.68E-03

[0134] Table 6

[0135] Example 8

[0136] The following is for reference Figure 11 This application describes an optical imaging apparatus according to Embodiment 8.

[0137] like Figure 11 As shown, the optical imaging device 800 includes a lens barrel and a seven-lens group and a spacer group disposed within the lens barrel. The seven-lens group, arranged sequentially along the optical axis from the object side to the image side, includes: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. An aperture stop STO may be disposed between the object side and the first lens E1. The spacer group includes a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a sixth spacer P6, and a seventh spacer P7. The spacer group also includes a fifth auxiliary spacer P5b disposed on the image side of the fifth spacer P5 and at least partially in contact with the image side of the fifth spacer P5. The spacers can block excess light during the imaging process from entering the next lens, while simultaneously allowing the lens to better support the lens barrel, thus enhancing the structural stability of the optical imaging device.

[0138] The lens structure in this embodiment is the same as that in Embodiment 7. That is, the basic parameter table of the optical imaging device in this embodiment is the same as Table 5, and the aspherical coefficient table is the same as Table 6. The difference between this embodiment and Embodiment 7 lies in the structural dimensions of the lens barrel, the first spacer P1, the second spacer P2, the third spacer P3, the fourth spacer P4, the fifth spacer P5, the sixth spacer P6, and the seventh spacer P7. For example, parameters such as d1s, d2m, D2s, D2m, d3s, d3m, D3s, d4s, D4s, d5s, d5m, d6m, d7m, d0s, d0m, EP12, EP23, EP34, EP45, EP56, and L are different.

[0139] Example 9

[0140] The following is for reference Figure 12 This application describes an optical imaging apparatus according to Embodiment 9.

[0141] like Figure 12 As shown, the optical imaging device 900 includes a lens barrel and a seven-lens group and a spacer group disposed within the lens barrel. The seven-lens group, arranged sequentially along the optical axis from the object side to the image side, includes: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. An aperture stop STO can be disposed between the object side and the first lens E1. The spacer group includes a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a sixth spacer P6, and a seventh spacer P7. The spacers prevent excess light from entering the next lens during the imaging process, while also ensuring better contact between the lens and the lens barrel, thus enhancing the structural stability of the optical imaging device.

[0142] The lens structure in this embodiment is the same as that in Embodiment 7. That is, the basic parameter table of the optical imaging device in this embodiment is the same as Table 5, and the aspherical coefficient table is the same as Table 6. The difference between this embodiment and Embodiment 7 lies in the structural dimensions of the lens barrel, the first spacer P1, the second spacer P2, the third spacer P3, the fourth spacer P4, the fifth spacer P5, the sixth spacer P6, and the seventh spacer P7. For example, parameters such as d1s, d2m, D2s, D2m, d3s, d3m, D3s, d4s, D4s, d5s, d5m, d6m, d7m, d0s, d0m, EP12, EP23, EP34, EP45, EP56, and L are different.

[0143] Figure 13A The on-axis chromatic aberration curves of the optical imaging devices of embodiments 7, 8, and 9 are shown, which represent the deviation of the focal point of light of different wavelengths after passing through the optical imaging device. Figure 13BAstigmatism curves of the optical imaging devices of Examples 7, 8, and 9 are shown, representing the meridional and sagittal image plane curvatures corresponding to different image heights. Figure 13C The distortion curves of the optical imaging devices in Examples 7, 8, and 9 are shown, representing the distortion magnitude values ​​corresponding to different image heights. According to... Figures 13A to 13C It can be seen that the optical imaging devices given in Examples 7, 8, and 9 can achieve good imaging quality.

[0144] Table 7 shows the values ​​of parameters d1s, d2m, D2s, D2m, d3s, d3m, D3s, d4s, D4s, d5s, d5m, d6m, d7m, d0s, d0m, EP12, EP23, EP34, EP45, EP56, and L for each embodiment in Examples 1-9. These parameters can be calculated according to... Figure 1A The measurements were obtained using the annotation method shown, and the units for all parameters listed in Table 7 are mm.

[0145] Parameters / Examples 1 2 3 4 5 6 7 8 9 d1s 4.1475 4.4111 4.4167 4.3696 4.4328 4.5542 4.4456 4.4258 4.3574 d2m 3.9623 3.9491 3.9711 3.966 3.9673 3.9649 3.9557 3.9601 3.9627 D2s 7.5019 5.9304 5.4622 7.7746 5.5478 11.3891 10.4197 5.7078 6.3174 D2m 7.5019 5.9304 5.4622 7.7746 5.5478 11.3891 10.4197 5.7078 6.3174 d3s 4.0214 4.0182 4.0173 4.0318 4.0291 4.0282 4.0239 4.0293 4.0346 d3m 4.0214 4.0182 4.0173 4.0318 4.0291 4.0282 4.0239 4.0293 4.0346 D3s 7.7976 6.0156 5.2533 8.2994 5.5956 11.5039 11.5283 5.8955 10.4911 d4s 4.9459 5.4659 4.9978 5.1293 5.1002 5.3394 5.5614 5.2088 5.7794 D4s 8.2445 8.6273 6.3519 8.6832 7.3885 11.5738 12.0974 8.1516 10.9049 d5s 6.7567 6.4613 6.1274 6.5748 6.0717 6.5702 6.5785 6.4083 6.9921 d5m 6.7567 6.4613 6.1274 6.5748 6.0717 6.5702 6.5785 7.1895 6.9921 d6m 8.9214 9.0464 8.902 9.2504 8.9707 9.4906 9.4457 9.3124 8.9689 d7m 10.8014 10.7837 10.9026 10.6678 10.6806 11.6881 11.1275 10.6309 11.1315 d0m 12.2168 12.4818 13.2273 12.3433 12.4864 12.0713 12.7183 11.9096 13.0198 d0s 6.6276 6.6276 5.8801 5.8183 6.8184 6.4981 5.9995 5.7382 5.4093 EP12 0.5193 0.5329 0.5618 0.4713 0.548 0.5868 0.5822 0.5549 0.4425 EP23 0.218 0.2374 0.2311 0.2483 0.2595 0.2383 0.2544 0.2587 0.3105 EP34 0.7626 0.979 0.8095 0.8215 0.7715 0.8579 0.9617 0.8252 1.025 EP45 1.0574 0.6214 0.5524 0.749 0.5291 0.8294 0.7489 1.0606 0.866 EP56 1.4857 1.7496 1.5338 1.8291 2.0177 1.8107 1.7474 1.512 1.3953 L 8.0645 8.2672 8.4269 8.2996 8.3429 8.1953 8.5723 8.03 8.4785

[0146] Table 7

[0147] Table 8 shows the values ​​of the conditional expressions for each of the embodiments in Examples 1 to 9.

[0148]

[0149]

[0150] Table 8

[0151] This application also provides an imaging device, wherein the electronic photosensitive element can be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device can be a stand-alone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging device described above.

[0152] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An optical imaging device, characterized in that, include: A seven-element lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged sequentially along the optical axis from the object side to the image side. The first lens, the fifth lens, and the sixth lens have positive optical power, the second lens and the seventh lens have negative optical power, and the third lens and the fourth lens have opposite positive and negative optical power attributes. A spacer assembly includes a first spacer, a second spacer, a sixth spacer, and a seventh spacer. The first spacer is positioned on and in contact with the image-side surface of the first lens. The second spacer is positioned on and in contact with the image-side surface of the second lens. The sixth spacer is positioned on and in contact with the image-side surface of the sixth lens. The seventh spacer is positioned on and in contact with the image-side surface of the seventh lens. as well as The lens barrel, the seven-element lens group and the spacer group are placed in the lens barrel; The optical imaging device contains seven lenses with optical power. The inner diameter d1s of the object side of the first spacer and the inner diameter d2s of the object side of the second spacer satisfy: d1s>d2s; The inner diameter d6m of the image side of the sixth spacer, the inner diameter d7m of the image side of the seventh spacer, and the radius of curvature R14 of the image side of the seventh lens satisfy: 0.63≤(d7m-d6m) / R14≤1.04; The combined focal length f67 of the sixth and seventh lenses, the length L of the lens barrel along the optical axis, and the maximum field of view (FOV) of the optical imaging device satisfy: -4.37 ≤ f67 / (L × tan(FOV)) < -0.90; The object-side surface of the first lens is convex, and the image-side surface is concave. The object-side surface of the second lens is convex, and the image-side surface is concave. The object-side surface of the fourth lens is convex, and the image-side surface is concave. The image-side surface of the fifth lens is convex. The object-side surface of the sixth lens is convex, and the image-side surface is concave. The object-side surface of the seventh lens is convex, and the image-side surface is concave.

2. The optical imaging device according to claim 1, characterized in that, The length L of the lens barrel along the optical axis, the center thickness CT6 of the sixth lens along the optical axis, the air gap T67 between the sixth and seventh lenses along the optical axis, and the center thickness CT7 of the seventh lens along the optical axis satisfy: 3.10 <L / (CT6+T67+CT7)<3.40。 3. The optical imaging device according to claim 1, characterized in that, The inner diameter d0s of the object-side end face of the lens barrel and the inner diameter d1s of the object-side side face of the first spacer satisfy: 1.20 <d0s / d1s≤1.60。 4. The optical imaging device according to claim 1, characterized in that, The effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the inner diameter d2m of the image side of the second spacer, and the outer diameter D2m of the image side of the second spacer satisfy: 3.63≤|f1×f2| / (d2m×D2m)≤10.

32.

5. The optical imaging device according to claim 1, characterized in that, The effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the inner diameter d1s of the object side of the first spacer, and the outer diameter D2s of the object side of the second spacer satisfy: 0.04≤d1s / f1+D2s / f2<0.

40.

6. The optical imaging device according to any one of claims 1-5, characterized in that, The spacer assembly further includes a third spacer disposed on and in contact with the image-side surface of the third lens. Wherein, the effective focal length f3 of the third lens, the inner diameter d3s of the object side surface of the third spacer, and the outer diameter D3s of the object side surface of the third spacer satisfy: -0.10mm≤D3s×d3s / f3<0.40mm.

7. The optical imaging device according to any one of claims 1-5, characterized in that, The spacer assembly further includes a third spacer disposed on and in contact with the image-side surface of the third lens. Wherein, the effective focal length f3 of the third lens, the radius of curvature R6 of the image side surface of the third lens, the inner diameter d3m of the image side surface of the third spacer, and the spacing EP23 of the second spacer and the third spacer along the optical axis satisfy: -0.93≤f3 / R6 / (d3m / EP23)<0.

10.

8. The optical imaging device according to any one of claims 1-5, characterized in that, The spacer assembly further includes a third spacer disposed on and in contact with the image-side surface of the third lens. Wherein, the spacing EP12 between the first spacer and the second spacer along the optical axis, the spacing EP23 between the second spacer and the third spacer along the optical axis, and the air spacing T23 between the second lens and the third lens on the optical axis satisfy: 0.20<(EP12-EP23) / T23≤0.

60.

9. The optical imaging device according to any one of claims 1-5, characterized in that, The spacer assembly further includes a fourth spacer disposed on and in contact with the image-side surface of the fourth lens, and a fifth spacer disposed on and in contact with the image-side surface of the fifth lens. Wherein, the air gap T56 between the fifth lens and the sixth lens on the optical axis and the air gap T67 between the sixth lens and the seventh lens on the optical axis satisfy: 1.70≤T67 / T56<2.30; The air gap T45 between the fourth lens and the fifth lens on the optical axis, the air gap T56 between the fifth lens and the sixth lens on the optical axis, and the gap EP45 between the fourth spacer and the fifth spacer along the optical axis and the gap EP56 between the fifth spacer and the sixth spacer along the optical axis satisfy: EP56 / T56>EP45 / T45. The inner diameter d0m of the image-side end face of the lens barrel, the inner diameter d5m of the image-side face of the fifth spacer, the spacing EP56 of the fifth spacer and the sixth spacer along the optical axis, and the center thickness CT6 of the sixth lens on the optical axis satisfy: 6.05≤(d0m-d5m) / (EP56-CT6)≤13.

86.

10. The optical imaging device according to any one of claims 1-5, characterized in that, The spacer assembly further includes a fourth spacer disposed on and in contact with the image-side surface of the fourth lens, and a fifth spacer disposed on and in contact with the image-side surface of the fifth lens. Wherein, the radius of curvature R8 of the image side of the fourth lens, the radius of curvature R9 of the object side of the fifth lens, the inner diameter d4s of the object side of the fourth spacer, and the inner diameter d5s of the object side of the fifth spacer satisfy: 2.94≤|R9 / R8| / (d5s / d4s)≤14.

71.

11. The optical imaging device according to any one of claims 1-5, characterized in that, The spacer assembly further includes a third spacer disposed on and in contact with the image-side surface of the third lens, and a fourth spacer disposed on and in contact with the image-side surface of the fourth lens. Wherein, the effective focal length f5 of the fifth lens, the refractive index N5 of the fifth lens, the outer diameter D3s of the object side of the third spacer and the outer diameter D4s of the object side of the fourth spacer satisfy: 2.30≤(f5×N5) / (D4s+D3s)<6.

40.

12. The optical imaging device according to any one of claims 1-5, characterized in that, The spacer assembly further includes a third spacer disposed on and in contact with the image-side surface of the third lens, a fourth spacer disposed on and in contact with the image-side surface of the fourth lens, and a fifth spacer disposed on and in contact with the image-side surface of the fifth lens. Wherein, the spacing EP34 between the third spacer and the fourth spacer along the optical axis, the spacing EP45 between the fourth spacer and the fifth spacer along the optical axis, the center thickness CT4 of the fourth lens on the optical axis and the center thickness CT5 of the fifth lens on the optical axis satisfy: 0.90<(EP34+EP45) / (CT4+CT5)≤1.

34.

13. The optical imaging device according to any one of claims 1-5, characterized in that, The spacer assembly further includes a fifth spacer disposed on and in contact with the image-side surface of the fifth lens. Wherein, the air gap T56 between the fifth lens and the sixth lens on the optical axis and the gap EP56 between the fifth spacer and the sixth spacer along the optical axis satisfy: 2.40 <EP56 / T56<3.90; The inner diameter d0m of the image-side end face of the lens barrel, the inner diameter d6m of the image-side surface of the sixth spacer, the spacing EP56 of the fifth and sixth spacers along the optical axis, and the air spacing T67 of the sixth and seventh lenses on the optical axis satisfy: 3.28≤(d0m-d6m) / (EP56-T67)<9.7.

Images