Optical imaging system

Abstract

The application discloses an optical imaging system, which comprises: a lens barrel and a lens group and a spacer element group arranged in the lens barrel, wherein the lens group comprises, in sequence 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 with positive refractive power, and a seventh lens with negative refractive power; and the spacer element group comprises a sixth spacer element arranged on the image side of the sixth lens and at least partially in contact with the image side surface of the sixth lens; the outer diameter D0m of the image side end surface of the lens barrel, the inner diameter d0m of the image side end surface of the lens barrel, the effective focal length f6 of the sixth lens, the effective focal length f7 of the seventh lens, the aperture number Fno of the optical imaging system, the inner diameter d6s of the object side surface of the sixth spacer element, and the outer diameter D6s of the object side surface of the sixth spacer element satisfy: -51 < f7 / (D0m-d0m) x Fno < -12 and 0 < f6 / (D6s-d6s) < 15.

Description

Technical Field

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

[0002] With the rapid development of technology, the continuous update and iteration of mobile electronic devices have promoted the optimization and upgrading of related industries. Most notably, the mobile phone industry has driven the continuous iteration and upgrading of optical imaging lenses. At the same time, with the continuous increase in mobile phone memory and people's pursuit of ultimate photo quality, the number of lens elements in the lens has become more and more, resulting in larger effective aperture diameters and outer diameters of the lens elements, and heavier weights, which is contrary to the requirements of lightweight and miniaturization of the terminal carrier.

[0003] Therefore, designing a miniaturized and large-aperture optical imaging lens to meet the needs of the current terminal carrier has become an urgent problem to be solved. Summary of the Invention

[0004] This application provides such an optical imaging system, which includes: a lens barrel, and a lens group and a spacer element group disposed in the lens barrel. Among them, the lens group includes, in order 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 with a positive optical power, and a seventh lens with a negative optical power; and the spacer element group includes: a sixth spacer element, disposed on the image side of the sixth lens and at least partially contacting the image side surface of the sixth lens; the outer diameter D0m of the image side end surface of the lens barrel, the inner diameter d0m of the image side end surface of the lens barrel, the effective focal length f6 of the sixth lens, the effective focal length f7 of the seventh lens, the aperture number Fno of the optical imaging system, the inner diameter d6s of the object side surface of the sixth spacer element and the outer diameter D6s of the object side surface of the sixth spacer element satisfy: -51 < f7 / (D0m - d0m) × Fno < -12 and 0 < f6 / (D6s - d6s) < 15.

[0005] In one embodiment, the maximum semi-field angle Semi-FOV of the optical imaging system, the effective focal length f7 of the seventh lens, the thickness CP6 of the sixth spacer element along the optical axis direction, the central thickness CT7 of the seventh lens on the optical axis, and the air gap T67 between the sixth lens and the seventh lens on the optical axis satisfy: -9 < tan(Semi-FOV) × f7 / (CP6 + T67 + CT7) < 0.

[0006] In one embodiment, the curvature radius R11 of the object side surface of the sixth lens, the curvature radius R14 of the image side surface of the seventh lens, the inner diameter d6s of the object side surface of the sixth spacer element and the outer diameter D6m of the image side surface of the sixth spacer element satisfy: 0 < (R11 + R14) / (D6m - d6s) < 9.

[0007] In one embodiment, the spacer group further includes a fourth spacer element, disposed on the image side of the fourth lens and in at least partial contact with the image side of the fourth lens; wherein the radius of curvature R8 of the image side of the fourth lens, the inner diameter d4s of the object side of the fourth spacer element and the outer diameter D4s of the object side of the fourth spacer element satisfy: R8 / (d4s+D4s)<-3.

[0008] In one embodiment, the spacer group further includes a fourth spacer element, disposed on the image side of the fourth lens and in at least partial contact with the image side surface of the fourth lens; wherein the effective focal length f5 of the fifth lens, the refractive index N4 of the fourth lens, the refractive index N5 of the fifth lens and the outer diameter D4m of the image side surface of the fourth spacer element satisfy: 0 < |f5| / (N4+N5) / D4m < 10.

[0009] In one embodiment, the spacer group further includes: a fifth spacer element, disposed on the image side of the fifth lens and in at least partial contact with the image side surface of the fifth lens; wherein the outer diameter D5m of the image side surface of the fifth spacer element, the Abbe number V5 of the fifth lens, the Abbe number V6 of the sixth lens, and the radius of curvature R9 of the object side surface of the fifth lens satisfy: 10<|(V6+V5) / R9|×D5m<36.

[0010] In one embodiment, the spacer group further includes: a fifth spacer element, disposed on the image side of the fifth lens and at least partially in contact with the image side of the fifth lens; wherein the inner diameter d5m of the image side of the fifth spacer element, the inner diameter d6m of the image side of the sixth spacer element, the center thickness CT5 of the fifth lens on the optical axis, the center thickness CT6 of the sixth lens on the optical axis, and the air gap T56 between the fifth and sixth lenses on the optical axis satisfy: 3<(d5m+d6m) / (CT5+T56+CT6)<8.

[0011] In one embodiment, the spacer group further includes: a third spacer element disposed on the image side of the third lens and at least partially in contact with the image side 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 element, the outer diameter D3s of the object side surface of the third spacer element, and the thickness CP3 of the third spacer element along the optical axis satisfy: 0 mm <f3 / (D3s-d3s)×CP3<3mm。

[0012] In one embodiment, the spacer group further includes: a second spacer element disposed on the image side of the second lens and at least partially in contact with the image side surface of the second lens; and a third spacer element disposed on the image side of the third lens and at least partially in contact with the image side surface of the third lens; wherein the effective focal length f2 of the second lens, the air gap T23 between the second and third lenses on the optical axis, the spacing EP23 between the second and third spacers along the optical axis, the outer diameter D3s of the object side surface of the third spacer element, and the inner diameter d2m of the image side surface of the second spacer element satisfy: -70mm <f2×(D3s-d2m) / (EP23+T23)<-18mm。

[0013] In one embodiment, the spacer group further includes: a second spacer element disposed on the image side of the second lens and in at least partial contact with the image side of the second lens; wherein the radius of curvature R3 of the object side of the second lens, the radius of curvature R4 of the image side of the second lens, the radius of curvature R5 of the object side of the third lens, the radius of curvature R6 of the image side of the third lens, the inner diameter d2s of the object side of the second spacer element and the outer diameter D2m of the image side of the second spacer element satisfy: R3 / R4>0, R5 / R6>0 and 0<(R4+R5) / (D2m-d2s)<9.

[0014] In one embodiment, the spacer element group further includes: a first spacer element disposed on the image side of the first lens and at least partially in contact with the image side surface of the first lens; wherein the effective focal length f1 of the first lens, the outer diameter D0s of the object side end face of the lens barrel, the inner diameter d0s of the object side end face of the lens barrel, and the air gap EP01 on the optical axis from the object side end face of the lens barrel to the object side surface of the first spacer element satisfy: 42mm <f1×(D0s+d0s) / EP01<65mm。

[0015] In one embodiment, the spacer element group further includes: a first spacer element disposed on the image side of the first lens and at least partially in contact with the image side surface of the first lens; wherein the radius of curvature R1 of the object side surface of the first lens, the inner diameter d1s of the object side surface of the first spacer element, and the outer diameter D1s of the object side surface of the first spacer element satisfy: 0 <R1 / (D1s-d1s)<5。

[0016] In one embodiment, the spacer group further includes: a first spacer element disposed on the image side of the first lens and in at least partial contact with the image side surface of the first lens; and a second spacer element disposed on the image side of the second lens and in at least partial contact with the image side surface of the second lens; wherein the thickness CP1 of the first spacer element along the optical axis, the thickness CP2 of the second spacer element along the optical axis, the aperture number Fno of the optical imaging system, and the air gap T12 between the first lens and the second lens on the optical axis satisfy: 0 < (CP1 + CP2) × Fno / T12 < 1.

[0017] In one embodiment, the spacer element group further includes: a fifth spacer element disposed on the image side of the fifth lens and at least partially contacting the image side surface of the fifth lens; wherein, the thickness CP5 of the fifth spacer element in the optical axis direction, the thickness CP6 of the sixth spacer element in the optical axis direction, the spacing distance EP56 between the fifth spacer element and the sixth spacer element in the optical axis direction, the effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens, and the effective focal length f7 of the seventh lens satisfy: -15 < ∣f5×CP5 + f6×CP6∣ / (f7×EP56) < 0.

[0018] In one embodiment, the spacer element group further includes: a fourth spacer element disposed on the image side of the fourth lens and at least partially contacting the image side surface of the fourth lens; and a fifth spacer element disposed on the image side of the fifth lens and at least partially contacting the image side surface of the fifth lens; wherein, the radius of curvature R9 of the object side surface of the fifth lens, the radius of curvature R8 of the image side surface of the fourth lens, the outer diameter D5m of the image side surface of the fifth spacer element, the outer diameter D5s of the object side surface of the fifth spacer element, the thickness CP5 of the fifth spacer element in the optical axis direction, and the spacing distance EP45 between the fourth spacer element and the fifth spacer element in the optical axis direction satisfy: 0 < (R9 / D5m - R8 / D5s)×(CP5 / EP45) < 15.

[0019] The optical imaging system provided by the present application rationally arranges the structures and dimensions of the lens barrel, lenses, and spacer elements, and satisfies: -51 < f7 / (D0m - d0m)×Fno < -12 and 0 < f6 / (D6s - d6s) < 15. By controlling the effective focal lengths of the sixth and seventh lenses, the inner and outer diameters of the image side surface of the lens barrel, the inner and outer diameters of the object side surface of the sixth spacer element, and the aperture number of the system, the contradiction between the lens barrel processability and the module size is well balanced, so as to meet the assembly of the system, minimize the size of the module, and while satisfying the processability of the sixth spacer element, control the light rays of the sixth lens within a reasonable image height range by the sixth spacer element to balance the sensitivity of the sixth lens. Therefore, the optical imaging system provided by the present application can meet the characteristics of miniaturization and large aperture while ensuring the imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] By reading the detailed description of the non-restrictive embodiments made with reference to the following drawings, other features, objects, and advantages of the present application will become more obvious:

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

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

[0023] Figures 3A to 3D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging system according to Embodiment 1 of this application are shown respectively.

[0024] Figures 4A to 4C A schematic diagram of the structure of an optical imaging system according to Embodiment 2 of this application is shown;

[0025] Figures 5A to 5D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging system according to Embodiment 2 of this application are shown respectively.

[0026] Figures 6A to 6C A schematic diagram of the structure of an optical imaging system according to Embodiment 3 of this application is shown; and

[0027] Figures 7A to 7D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging system according to Embodiment 3 of this application are shown respectively. Detailed Implementation

[0028] 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. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0029] 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.

[0030] 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 strictly to scale.

[0031] 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.

[0032] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, 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.

[0033] 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.

[0034] It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other. The following embodiments only illustrate several implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be pointed out that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of this application, and these all fall within the protection scope of this application. For example, the lens group, lens barrel, and spacer element in the various embodiments of this application can be arbitrarily combined, and it is not limited to the lens group in one embodiment being combined only with the lens barrel, spacer element, etc. of that embodiment.

[0035] The present application will now be described in detail with reference to the accompanying drawings and embodiments. Figure 1 This diagram illustrates the structural layout and schematic diagrams of some parameters of an optical imaging system according to this application. Those skilled in the art will understand that some lens parameters commonly used in the art, such as the center thickness CT1 of the first lens on the optical axis, are not shown. Figure 1 As shown in the figure, Figure 1 The present application only exemplarily illustrates some parameters of the lens barrel and spacer element of an optical imaging system to facilitate a better understanding of the invention. Figure 1As shown, CP1 is the thickness of the first spacer element along the optical axis, CP2 is the thickness of the second spacer element along the optical axis, CP3 is the thickness of the third spacer element along the optical axis, CP5 is the thickness of the fifth spacer element along the optical axis, CP6 is the thickness of the sixth spacer element along the optical axis, EP01 is the air gap along the optical axis from the object-side end face of the lens barrel to the object-side surface of the first spacer element, EP23 is the distance between the second and third spacers along the optical axis, and EP45 is the distance between the fourth and fifth spacers along the optical axis. The distance EP56 is the spacing between the fifth and sixth spacers along the optical axis, D0m is the outer diameter of the image-side end face of the lens tube, d0m is the inner diameter of the image-side end face of the lens tube, D0s is the outer diameter of the object-side end face of the lens tube, and d0s is the inner diameter of the object-side end face of the lens tube. In addition, Dis represents the outer diameter of the object-side surface of the i-th spacer, Dim represents the outer diameter of the image-side surface of the i-th spacer, dis represents the inner diameter of the object-side surface of the i-th spacer, and dim represents the inner diameter of the image-side surface of the i-th spacer, where i = 1, 2, 3, 4, 5, or 6.

[0036] An optical imaging system according to an exemplary embodiment of this application includes a lens barrel and a lens group and a spacer element group disposed within the lens barrel. The 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, wherein the sixth lens has positive optical power and the seventh lens has negative optical power.

[0037] In an exemplary embodiment, the spacer element group 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, and a sixth spacer element; wherein, the first spacer element is placed on the image side of the first lens and at least partially in contact with the image side of the first lens, the second spacer element is placed on the image side of the second lens and at least partially in contact with the image side of the second lens, the third spacer element is placed on the image side of the third lens and at least partially in contact with the image side of the third lens, the fourth spacer element is placed on the image side of the fourth lens and at least partially in contact with the image side of the fourth lens, the fifth spacer element is placed on the image side of the fifth lens and at least partially in contact with the image side of the fifth lens, and the sixth spacer element is placed on the image side of the sixth lens and at least partially in contact with the image side of the sixth lens. It should be understood that this application does not specifically limit the number of spacer elements; any number of spacer elements may be included between any two lenses, and the entire optical imaging system may also include any number of spacer elements. Spacer elements help the optical imaging system intercept excess reflective light paths, reducing stray light and ghosting. Adding auxiliary support between the spacer element and the lens barrel helps to improve problems such as poor assembly stability and low performance yield caused by large step differences between lenses.

[0038] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: -51 < f7 / (D0m - d0m) × Fno < -12, where D0m is the outer diameter of the image-side end face of the lens barrel, d0m is the inner diameter of the image-side end face of the lens barrel, f7 is the effective focal length of the seventh lens, and Fno is the f-number of the optical imaging system. Satisfying -51 < f7 / (D0m - d0m) × Fno < -12 and reasonably setting the inner and outer diameters of the image side of the lens barrel and the f-number of the system helps to balance the contradiction between the machinability of the lens barrel and the module size, thereby satisfying the assembly of the system, minimizing the size of the module to the greatest extent, and facilitating the realization of the characteristics of miniaturization and large aperture.

[0039] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 0 < f6 / (D6s - d6s) < 15, where f6 is the effective focal length of the sixth lens, d6s is the inner diameter of the object side face of the sixth spacer element, and D6s is the outer diameter of the object side face of the sixth spacer element. Satisfying 0 < f6 / (D6s - d6s) < 15 and controlling the effective focal length of the sixth lens and the inner and outer diameters of the object side face of the sixth spacer element helps to balance the sensitivity of the sixth lens within a reasonable image height range while satisfying the machinability of the sixth spacer element, thereby improving the imaging quality of the system.

[0040] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: -9 < tan(Semi-FOV) × f7 / (CP6 + T67 + CT7) < 0, where Semi-FOV is the maximum semi-field angle of the optical imaging system, f7 is the effective focal length of the seventh lens, CP6 is the thickness of the sixth spacer element along the optical axis direction, CT7 is the central thickness of the seventh lens on the optical axis, and T67 is the air gap between the sixth lens and the seventh lens on the optical axis. Satisfying -9 < tan(Semi-FOV) × f7 / (CP6 + T67 + CT7) < 0 can effectively control the incident angle of the seventh lens and improve the matching degree with the chip CRA.

[0041] In an exemplary embodiment, the optical imaging system according to the present application satisfies: 0 < (R11 + R14) / (D6m - d6s) < 9, where R11 is the curvature radius of the object side face of the sixth lens, R14 is the curvature radius of the image side face of the seventh lens, d6s is the inner diameter of the object side face of the sixth spacer element, and D6m is the outer diameter of the image side face of the sixth spacer element. Satisfying 0 < (R11 + R14) / (D6m - d6s) < 9 and controlling the curvature of the object side face of the sixth lens and the curvature of the image side face of the seventh lens within a reasonable range can keep the edge thickness of the sixth lens and the seventh lens within a reasonable range, satisfying both the strength of a single component and the assembly of a single component, and adding a spacer element between the sixth lens and the seventh lens to improve the stray light of the system.

[0042] In an exemplary embodiment, the optical imaging system according to this application satisfies: R8 / (d4s+D4s)<-3, where R8 is the radius of curvature of the image-side surface of the fourth lens, d4s is the inner diameter of the object-side surface of the fourth spacer element, and D4s is the outer diameter of the object-side surface of the fourth spacer element. Satisfying R8 / (d4s+D4s)<-3 facilitates the fabrication feasibility of the fourth spacer element and enhances its own strength, resulting in more stable assembly.

[0043] In an exemplary embodiment, the optical imaging system according to this application satisfies: 0 < |f5| / (N4+N5) / D4m < 10, where f5 is the effective focal length of the fifth lens, N4 is the refractive index of the fourth lens, N5 is the refractive index of the fifth lens, and D4m is the outer diameter of the image-side surface of the fourth spacer element. Satisfying 0 < |f5| / (N4+N5) / D4m < 10 is beneficial for controlling the incident angle of the object-side surface of the fifth lens, reducing the optical sensitivity of the fifth lens, and simultaneously reducing costs through reasonable matching with the material of the fourth lens.

[0044] In an exemplary embodiment, the optical imaging system according to this application satisfies: 10 < |(V6+V5) / R9|×D5m < 36, where D5m is the outer diameter of the image-side surface of the fifth spacer element, V5 is the Abbe number of the fifth lens, V6 is the Abbe number of the sixth lens, and R9 is the radius of curvature of the object-side surface of the fifth lens. Satisfying 10 < |(V6+V5) / R9|×D5m < 36 allows for effective aberration balance and cost reduction through control of the Abbe numbers of the fifth and sixth lenses. Furthermore, controlling the radius of curvature of the object-side surface of the fifth lens improves its formability, reduces the risk of weld lines, and increases the overlap area between the fifth and fourth lenses, thereby enhancing lens assembly stability.

[0045] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 3 < (d5m + d6m) / (CT5 + T56 + CT6) < 8, where d5m is the inner diameter of the image side of the fifth spacer element, d6m is the inner diameter of the image side of the sixth spacer element, CT5 is the central thickness of the fifth lens on the optical axis, CT6 is the central thickness of the sixth lens on the optical axis, and T56 is the air gap between the fifth lens and the sixth lens on the optical axis. Satisfying 3 < (d5m + d6m) / (CT5 + T56 + CT6) < 8 can improve the smoothness and formability of the effective surface of the lens (the aspherical surface for transmitting effective light), ensure that the fifth lens and the sixth lens do not have a significantly curved surface shape, improve the stability during lens assembly, reduce assembly deformation, and improve the imaging quality; in addition, controlling the air gap between the fifth lens and the sixth lens on the optical axis controls the maximum thickness of the sixth spacer element, avoiding assembly interference and making it more convenient to adjust the field curvature.

[0046] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 0 mm < f3 / (D3s - d3s) × CP3 < 3 mm, where f3 is the effective focal length of the third lens, d3s is the inner diameter of the object side of the third spacer element, D3s is the outer diameter of the object side of the third spacer element, and CP3 is the thickness of the third spacer element along the optical axis. Satisfying 0 mm < f3 / (D3s - d3s) × CP3 < 3 mm can achieve the functions of converging received light and converging light by controlling the effective focal length of the third lens; in addition, by controlling the inner diameter of the object side of the third spacer element, the feather stray light and corner white line stray light reflected by the inner diameter surface of the spacer element can be effectively reduced, and by controlling the outer diameter of the image side of the third spacer element, a stable step difference can be obtained, which can also ensure that the lens has the characteristics of a small volume and high image quality.

[0047] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: -70 mm < f2 × (D3s - d2m) / (EP23 + T23) < -18 mm, where f2 is the effective focal length of the second lens, T23 is the air gap between the second lens and the third lens on the optical axis, EP23 is the distance between the second spacer element and the third spacer element along the optical axis, D3s is the outer diameter of the object side of the third spacer element, and d2m is the inner diameter of the image side of the second spacer element. Satisfying -70 mm < f2 × (D3s - d2m) / (EP23 + T23) < -18 mm ensures that the central thickness and edge thickness of the third lens can be in a relatively reasonable range, improving the processability of the third lens, and controlling the air gap between the second lens and the third lens on the optical axis to avoid assembly interference.

[0048] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: R3 / R4 > 0, R5 / R6 > 0, and 0 < (R4 + R5) / (D2m - d2s) < 9, where R3 is the radius of curvature of the object side surface of the second lens, R4 is the radius of curvature of the image side surface of the second lens, R5 is the radius of curvature of the object side surface of the third lens, R6 is the radius of curvature of the image side surface of the third lens, d2s is the inner diameter of the object side surface of the second spacer element, and D2m is the outer diameter of the image side surface of the second spacer element. Satisfying R3 / R4 > 0, R5 / R6 > 0, and 0 < (R4 + R5) / (D2m - d2s) < 9 is conducive to reducing the total length of the lens by controlling the curvatures of the second lens and the third lens; in addition, by controlling the curvatures, the light rays of the second lens and the third lens can be smoothly transitioned, reducing the lens sensitivity.

[0049] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 42 mm < f1×(D0s + d0s) / EP01 < 65 mm, where f1 is the effective focal length of the first lens, D0s is the outer diameter of the object side end face of the lens barrel, d0s is the inner diameter of the object side end face of the lens barrel, and EP01 is the air gap on the optical axis from the object side end face of the lens barrel to the object side surface of the first spacer element. Satisfying 42 mm < f1×(D0s + d0s) / EP01 < 65 mm is conducive to controlling the axial strength of the lens barrel, improving the assembly stability, and facilitating the requirements of a small-headed lens.

[0050] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 0 < R1 / (D1s - d1s) < 5, where R1 is the radius of curvature of the object side surface of the first lens, d1s is the inner diameter of the object side surface of the first spacer element, and D1s is the outer diameter of the object side surface of the first spacer element. Satisfying 0 < R1 / (D1s - d1s) < 5 is conducive to reducing the machining angle of the radius of curvature of the first lens and facilitating the machining and forming of the first lens; by controlling the inner diameter of the object side surface of the first spacer element, the light blocking efficiency of the first spacer element can be effectively improved, reducing the risk of stray light.

[0051] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 0 < (CP1 + CP2)×Fno / T12 < 1, where CP1 is the thickness of the first spacer element along the optical axis direction, CP2 is the thickness of the second spacer element along the optical axis direction, Fno is the f-number of the optical imaging system, and T12 is the air gap on the optical axis between the first lens and the second lens. Satisfying 0 < (CP1 + CP2)×Fno / T12 < 1 is conducive to the overall head design of the lens, enabling it to take into account the characteristics of a small head; at the same time, it is conducive to the design of the f-number of the optical imaging system, improving the lens quality.

[0052] In an exemplary embodiment, the optical imaging system according to this application can satisfy: -15<|f5×CP5+f6×CP6| / (f7×EP56)<0, where CP5 is the thickness of the fifth spacer element along the optical axis, CP6 is the thickness of the sixth spacer element along the optical axis, EP56 is the spacing distance between the fifth and sixth spacers along the optical axis, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens. Satisfying -15 < |f5×CP5+f6×CP6| / (f7×EP56) < 0 improves the smoothness and formability of the lens's effective surface (the aspherical surface used to transmit effective light), ensuring that the fifth, sixth, and seventh lenses do not have excessively curved surface shapes, thus improving the stability during lens assembly, reducing assembly deformation, and enhancing image quality. In addition, controlling the maximum thickness of the sixth spacer element prevents assembly interference and facilitates field curvature adjustment. Controlling the thickness of the fifth spacer element ensures its processing feasibility and its own strength, further improving assembly stability.

[0053] In an exemplary embodiment, the optical imaging system according to this application satisfies: 0 < (R9 / D5m - R8 / D5s) × (CP5 / EP45) < 15, where R9 is the radius of curvature of the object-side surface of the fifth lens, R8 is the radius of curvature of the image-side surface of the fourth lens, D5m is the outer diameter of the image-side surface of the fifth spacer element, D5s is the outer diameter of the object-side surface of the fifth spacer element, CP5 is the thickness of the fifth spacer element along the optical axis, and EP45 is the distance between the fourth and fifth spacers along the optical axis. Satisfying 0 < (R9 / D5m - R8 / D5s) × (CP5 / EP45) < 15, by controlling the ratio of the radius of curvature of the object-side surface of the fifth lens and the radius of curvature of the image-side surface of the fourth lens, helps to achieve the design requirement of a large image plane within a smaller volume. Furthermore, satisfying this condition is beneficial for controlling the angle of the fourth and fifth lenses, which is beneficial for the molding of individual components and for reducing the risk of stray light.

[0054] In embodiments of this application, at least one of the mirror surfaces of each lens is an aspherical mirror surface; that is, at least one mirror surface from the object-side surface of the first lens to the image-side surface of the seventh lens is an aspherical mirror surface. The characteristic of an aspherical lens is that its curvature changes continuously from the lens center to the lens periphery. Unlike a spherical lens, which has a constant curvature from the lens center to the lens periphery, an aspherical lens has better radius of curvature characteristics, offering advantages in improving distortion aberrations and astigmatism. By using an aspherical lens, aberrations occurring during imaging can be eliminated as much as possible, thereby improving image quality. Optionally, the object-side surface and image-side surface of all lenses from the first to the seventh lens are aspherical mirror surfaces.

[0055] In an exemplary embodiment, the first lens may have positive optical power, the second lens may have negative optical power, the third lens may have positive optical power, the fourth lens may have positive or negative optical power, the fifth lens may have positive or negative optical power, the sixth lens may have positive optical power, and the seventh lens may have negative optical power.

[0056] In an exemplary embodiment, the optical imaging system described above may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0057] The optical imaging system according to the above embodiments of this application can employ multiple lenses, such as the seven lenses mentioned above. By rationally allocating the optical power, surface shape, and arrangement of the spacers of each lens, the range of each lens-tube engagement is made more uniform, enhancing the light-gathering ability and improving the imaging quality of ultra-thin, large-image-plane imaging lenses. However, those skilled in the art should understand that the number of lenses constituting the optical imaging system can be changed without departing from the technical solutions claimed in this application to obtain the various results and advantages described in this specification. For example, although seven lenses are described as an example in the embodiments, the optical imaging system is not limited to including seven lenses. If necessary, the optical imaging system may also include other numbers of lenses.

[0058] Specific embodiments of the optical imaging system applicable to the above-described embodiments are further described below with reference to the accompanying drawings.

[0059] Example 1

[0060] The following is for reference Figures 2A to 3D The optical imaging system 1001, optical imaging system 1002 and optical imaging system 1003 according to Embodiment 1 of this application are described. Figures 2A to 2C Schematic diagrams of optical imaging systems 1001, 1002 and 1003 according to Embodiment 1 of this application are shown respectively.

[0061] like Figures 2A to 2C As shown, optical imaging systems 1001, 1002 and 1003 each include a lens barrel P0, lens groups E1 to E7 and spacer element groups P1 to P6.

[0062] like Figures 2A to 2CAs shown, optical imaging systems 1001, 1002, and 1003 employ the same lens group, which, from the object side to the image side, sequentially 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. 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. The filter (not shown) has an object side surface S15 (not shown) and an image side surface S16 (not shown). Light from the object passes through each surface S1 to S16 in sequence and is finally imaged on the imaging surface S17 (not shown).

[0063] Table 1 shows the basic parameters of the lens groups of optical imaging systems 1001, 1002 and 1003 of Embodiment 1, wherein the units of radius of curvature, thickness and effective focal length are all millimeters (mm).

[0064]

[0065]

[0066] Table 1

[0067] In this example, the effective focal length f of optical imaging systems 1001, 1002, and 1003 is 7.7532 mm, the maximum semi-field of view (Semi-FOV) of optical imaging systems 1001, 1002, and 1003 is 30.3286°, and the aperture number Fno of optical imaging systems 1001, 1002, and 1003 is 1.65.

[0068] In Embodiment 1, 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:

[0069]

[0070] 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. Tables 2-1 and 2-2 give the higher-order coefficients A4, A6, A8, A14 that can be used for each aspherical mirror S1-S14 in Example 1. 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 and A 30 .

[0071] Face number A4 A6 A8 A10 A12 A14 A16 S1 -2.5178E-02 -2.9568E-03 3.7906E-04 6.1622E-04 3.2444E-04 9.4125E-05 -1.3659E-05 S2 2.7156E-02 6.0560E-03 1.8758E-03 1.3372E-03 2.5262E-04 -1.1127E-04 -1.0584E-04 S3 -3.9477E-02 1.5058E-02 -1.0568E-03 6.3088E-04 1.4751E-05 -1.7156E-04 -7.9067E-05 S4 -3.8535E-02 2.0059E-02 -7.7222E-04 -8.5244E-04 -2.5552E-04 -1.6019E-04 -5.1739E-05 S5 -3.7486E-02 2.6366E-02 6.3473E-03 4.4102E-04 1.7085E-04 1.2914E-04 -3.1810E-06 S6 -3.4265E-02 3.0527E-02 1.2407E-02 3.9229E-03 2.1162E-03 1.1030E-03 5.2194E-04 S7 -4.2350E-01 -3.9719E-02 -1.0024E-02 -2.6947E-03 1.5267E-04 1.0606E-04 3.4431E-04 S8 -6.2919E-01 -1.5889E-02 4.2199E-03 -7.4951E-04 3.0296E-03 1.0915E-04 8.9426E-04 S9 -5.4642E-01 -6.4884E-02 3.1728E-03 -7.8067E-03 2.9902E-03 -8.6252E-04 1.3741E-03 S10 -4.0417E-01 -3.2014E-02 1.1763E-02 -8.4316E-03 5.1031E-03 -2.4664E-03 2.1579E-03 S11 -5.9395E-01 -7.5918E-02 3.8280E-03 -1.5828E-02 6.5618E-03 -2.3346E-04 4.2530E-03 S12 -6.4561E-01 -2.7373E-03 2.1580E-02 -4.6754E-02 3.0797E-03 8.3693E-03 2.8790E-03 S13 -1.5008E+00 5.4427E-01 -1.2066E-01 -3.2577E-03 8.7393E-03 1.1961E-02 -5.9224E-03 S14 -3.5694E+00 3.8309E-01 -1.7947E-01 3.8121E-02 -5.0883E-03 8.9348E-03 -7.8363E-04

[0072] Table 2-1

[0073]

[0074]

[0075] Table 2-2

[0076] like Figures 2A to 2C As shown, optical imaging systems 1001, 1002, and 1003 each include six spacer elements. The first spacer element P1 is positioned on the image side of the first lens and at least partially contacts the image side of the first lens; the second spacer element P2 is positioned on the image side of the second lens and at least partially contacts the image side of the second lens; the third spacer element P3 is positioned on the image side of the third lens and at least partially contacts the image side of the third lens; the fourth spacer element P4 is positioned on the image side of the fourth lens and at least partially contacts the image side of the fourth lens; the fifth spacer element P5 is positioned on the image side of the fifth lens and at least partially contacts the image side of the fifth lens; and the sixth spacer element P6 is positioned on the image side of the sixth lens and at least partially contacts the image side of the sixth lens. These spacer elements can block excess external light from entering, allowing the lens and lens barrel to better support each other, and enhancing the structural stability of optical imaging systems 1001, 1002, and 1003.

[0077] Table 3 shows the basic parameters of the spacer elements and lens barrels of the optical imaging systems 1001, 1002 and 1003 of Embodiment 1. The unit of each parameter in Table 3 is millimeters (mm).

[0078]

[0079]

[0080] Table 3

[0081] Figure 3A The on-axis chromatic aberration curves of optical imaging systems 1001, 1002 and 1003 of Embodiment 1 are shown, which represent the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 3B Astigmatism curves of optical imaging systems 1001, 1002 and 1003 of Embodiment 1 are shown, representing meridional image plane curvature and sagittal image plane curvature. Figure 3C The distortion curves of optical imaging systems 1001, 1002 and 1003 of Embodiment 1 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 3D The magnification chromatic aberration curves of optical imaging systems 1001, 1002, and 1003 of Embodiment 1 are shown, representing the deviations in image height at different points on the imaging plane after light passes through the lens. According to... Figures 3A to 3D It can be seen that the optical imaging system 1001, optical imaging system 1002 and optical imaging system 1003 given in Example 1 can achieve good imaging quality.

[0082] Example 2

[0083] The following is for reference Figures 4A to 5D The optical imaging system 2001, optical imaging system 2002, and optical imaging system 2003 according to Embodiment 2 of this application are described. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to those in Embodiment 1 will be omitted. Figures 4A to 4C Schematic diagrams of optical imaging systems 2001, 2002 and 2003 according to Embodiment 2 of this application are shown respectively.

[0084] like Figures 4A to 4C As shown, optical imaging systems 2001, 2002 and 2003 each include a lens barrel P0, lens groups E1 to E7 and spacer element groups P1 to P6.

[0085] like Figures 4A to 4CAs shown, optical imaging systems 2001, 2002, and 2003 employ the same lens group, which, from the object side to the image side, sequentially 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. 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. The filter (not shown) has an object side surface S15 (not shown) and an image side surface S16 (not shown). Light from the object passes through each surface S1 to S16 in sequence and is finally imaged on the imaging surface S17 (not shown).

[0086] In this example, the effective focal length f of optical imaging systems 2001, 2002, and 2003 is 7.6803 mm, the maximum semi-field-of-view (Semi-FOV) of optical imaging systems 2001, 2002, and 2003 is 25.4847°, and the aperture number Fno of optical imaging systems 2001, 2002, and 2003 is 1.85.

[0087] Table 4 shows the basic parameters of the lens groups of optical imaging systems 2001, 2002 and 2003 of Embodiment 2, wherein the units of radius of curvature, thickness and effective focal length are millimeters (mm). Tables 5-1 and 5-2 show the higher-order coefficients that can be used for each aspherical mirror in Embodiment 2, wherein each aspherical surface shape can be defined by formula (1) given in Embodiment 1 above.

[0088]

[0089] Table 4

[0090]

[0091]

[0092] Table 5-1

[0093] Face number A18 A20 A22 A24 A26 A28 A30 S1 2.2712E-05 -2.9199E-05 -5.7312E-05 -5.0561E-05 -3.4237E-05 -1.4707E-05 -4.0706E-06 S2 -1.2731E-05 9.9721E-07 -1.5844E-06 1.4582E-06 1.1358E-06 -6.4196E-07 -1.4985E-06 S3 1.3513E-04 1.2241E-04 8.9039E-05 5.9828E-05 3.2196E-05 1.1628E-05 2.3815E-06 S4 -1.1849E-04 -6.6662E-05 2.9821E-05 7.0590E-05 4.7420E-05 1.4642E-05 -3.4031E-07 S5 -3.0890E-04 -3.1550E-04 -1.4435E-04 -4.2485E-06 3.8121E-05 2.4831E-05 5.0697E-06 S6 3.9217E-04 1.1714E-04 1.9815E-05 7.4161E-06 1.6624E-05 1.5754E-05 6.6284E-06 S7 -1.3591E-04 -4.0006E-05 1.4168E-04 2.0058E-04 1.7243E-04 8.8377E-05 2.9834E-05 S8 -2.4073E-04 5.5013E-04 6.9090E-04 5.3888E-04 2.8405E-04 1.1543E-04 1.8448E-05 S9 6.1097E-04 6.0499E-04 1.5704E-04 1.4314E-04 4.4715E-05 4.9937E-05 2.8236E-05 S10 -1.2632E-03 -1.8582E-06 1.5694E-04 7.4149E-04 2.8285E-04 1.8551E-04 -7.9418E-07 S11 -9.5672E-04 9.7142E-04 -4.6813E-04 3.3743E-04 -3.7756E-04 -1.1331E-04 -1.4588E-04 S12 -9.6524E-04 1.6566E-03 -1.6635E-03 -1.5204E-04 -4.5086E-04 3.9111E-05 -5.8047E-05 S13 -1.1876E-02 5.9129E-03 -1.9436E-03 -1.0165E-03 -9.5803E-04 -3.0709E-04 2.6735E-04 S14 -2.6666E-02 2.3261E-02 -1.3085E-02 3.8678E-03 -8.0973E-03 -7.2680E-04 -2.2885E-03

[0094] Table 5-2

[0095] like Figures 4A to 4CAs shown, optical imaging systems 2001, 2002, and 2003 each include six spacer elements. The first spacer element P1 is positioned on the image side of the first lens and at least partially contacts the image side of the first lens; the second spacer element P2 is positioned on the image side of the second lens and at least partially contacts the image side of the second lens; the third spacer element P3 is positioned on the image side of the third lens and at least partially contacts the image side of the third lens; the fourth spacer element P4 is positioned on the image side of the fourth lens and at least partially contacts the image side of the fourth lens; the fifth spacer element P5 is positioned on the image side of the fifth lens and at least partially contacts the image side of the fifth lens; and the sixth spacer element P6 is positioned on the image side of the sixth lens and at least partially contacts the image side of the sixth lens. These spacer elements can block excess external light from entering, allowing the lens and lens barrel to better support each other, and enhancing the structural stability of optical imaging systems 2001, 2002, and 2003.

[0096] Table 6 shows the basic parameters of the spacer elements and lens barrels of optical imaging systems 2001, 2002 and 2003 of Embodiment 2. The unit of each parameter in Table 6 is millimeters (mm).

[0097]

[0098]

[0099] Table 6

[0100] Figure 5A The on-axis chromatic aberration curves of optical imaging systems 2001, 2002 and 2003 of Embodiment 2 are shown, which indicate the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 5B Astigmatism curves of optical imaging systems 2001, 2002 and 2003 of Embodiment 2 are shown, representing meridional image plane curvature and sagittal image plane curvature. Figure 5C The distortion curves of optical imaging systems 2001, 2002 and 2003 of Embodiment 2 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 5D The magnification chromatic aberration curves of optical imaging systems 2001, 2002, and 2003 of Embodiment 2 are shown, representing the deviations in image height at different points on the imaging plane after light passes through the lens. According to... Figures 5A to 5D It can be seen that the optical imaging system 2001, optical imaging system 2002 and optical imaging system 2003 given in Example 2 can achieve good imaging quality.

[0101] Example 3

[0102] The following is for reference Figures 6A to 7D The optical imaging system 3001, optical imaging system 3002 and optical imaging system 3003 according to Embodiment 3 of this application are described. Figures 6A to 6C Schematic diagrams of optical imaging systems 3001, 3002 and 3003 according to Embodiment 3 of this application are shown respectively.

[0103] like Figures 6A to 6C As shown, optical imaging systems 3001, 3002 and 3003 each include a lens barrel P0, lens groups E1 to E7 and spacer element groups P1 to P6.

[0104] like Figures 6A to 6C As shown, optical imaging systems 3001, 3002, and 3003 employ the same lens group, which, from the object side to the image side, sequentially 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. 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. The filter (not shown) has an object side surface S15 (not shown) and an image side surface S16 (not shown). Light from the object passes through each surface S1 to S16 in sequence and is finally imaged on the imaging surface S17 (not shown).

[0105] In this example, the effective focal length f of optical imaging systems 3001, 3002, and 3003 is 8.8716 mm, the maximum semi-field of view (Semi-FOV) of optical imaging systems 3001, 3002, and 3003 is 25.6404°, and the aperture number Fno of optical imaging systems 3001, 3002, and 3003 is 1.69.

[0106] Table 7 shows the basic parameters of the lens groups of optical imaging systems 3001, 3002 and 3003 of Embodiment 3, wherein the units of radius of curvature, thickness and effective focal length are millimeters (mm). Tables 8-1 and 8-2 show the higher-order coefficients that can be used for each aspherical mirror in Embodiment 3, wherein each aspherical surface shape can be defined by formula (1) given in Embodiment 1 above.

[0107]

[0108] Table 7

[0109]

[0110]

[0111] Table 8-1

[0112] Face number A18 A20 A22 A24 A26 A28 A30 S1 1.4644E-05 -7.8082E-06 7.3527E-06 -8.2879E-06 1.5882E-06 -2.2666E-06 5.8804E-06 S2 -2.8037E-05 -6.1295E-06 -9.2818E-06 -4.5300E-06 2.5845E-06 3.0551E-06 2.9653E-06 S3 -3.3419E-05 -1.0197E-05 -9.9717E-06 -4.8924E-06 3.3339E-06 9.8830E-07 2.1429E-06 S4 5.1729E-07 -7.0044E-06 -6.6928E-06 -9.5013E-06 -1.8883E-06 -2.1612E-07 1.7222E-06 S5 -1.8819E-07 -1.3600E-05 -1.0973E-05 -1.4053E-05 -5.4299E-06 -1.4924E-06 1.4955E-06 S6 2.0531E-05 6.8637E-07 6.7423E-06 -8.8445E-06 -4.5095E-06 -2.9900E-06 2.9984E-06 S7 -2.1703E-05 -2.3333E-05 -8.6933E-06 -1.1482E-05 -5.4989E-06 -7.9201E-06 -3.7525E-06 S8 -2.0729E-05 4.5350E-05 -2.2723E-06 2.2085E-05 -2.9482E-06 7.6484E-06 -4.0788E-06 S9 3.8036E-05 3.1156E-04 7.1048E-05 4.4110E-05 3.2108E-06 -2.4861E-04 -7.5769E-05 S10 -1.3475E-04 6.5456E-05 -2.1653E-05 1.6111E-05 -5.5035E-06 -1.4179E-06 6.5519E-07 S11 1.9083E-04 -1.3704E-04 4.3449E-05 7.3903E-05 8.1681E-05 -6.1584E-05 -3.6556E-05 S12 9.7882E-04 6.2379E-04 7.5068E-04 4.6605E-04 4.4358E-04 1.1332E-04 2.9398E-05 S13 -2.4122E-04 -5.0992E-05 8.2556E-05 9.0290E-05 2.7508E-04 1.2177E-04 1.2652E-04 S14 1.3915E-04 -2.8318E-04 5.0718E-05 -2.4148E-04 -7.1367E-06 -4.8025E-06 6.5218E-05

[0113] Table 8-2

[0114] like Figures 6A to 6C As shown, optical imaging systems 3001, 3002, and 3003 each include seven spacer elements. The first spacer element P1 is positioned on the image side of the first lens and at least partially contacts the image side of the first lens; the second spacer element P2 is positioned on the image side of the second lens and at least partially contacts the image side of the second lens; the third spacer element P3 is positioned on the image side of the third lens and at least partially contacts the image side of the third lens; the fourth spacer element P4 is positioned on the image side of the fourth lens and at least partially contacts the image side of the fourth lens; the fifth spacer element P5 is positioned on the image side of the fifth lens and at least partially contacts the image side of the fifth lens; and the sixth spacer element P6 is positioned on the image side of the sixth lens and at least partially contacts the image side of the sixth lens. These spacer elements can block excess external light from entering, allowing the lens and lens barrel to better support each other, and enhancing the structural stability of optical imaging systems 3001, 3002, and 3003.

[0115] Table 9 shows the basic parameters of the spacer elements and lens barrels of the optical imaging systems 3001, 3002 and 3003 of Embodiment 3. The unit of each parameter in Table 9 is millimeters (mm).

[0116]

[0117]

[0118] Table 9

[0119] Figure 7A The on-axis chromatic aberration curves of optical imaging systems 3001, 3002 and 3003 of Embodiment 3 are shown, which indicate the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 7B Astigmatism curves of optical imaging systems 3001, 3002 and 3003 of Embodiment 3 are shown, representing meridional image plane curvature and sagittal image plane curvature. Figure 7CThe distortion curves of optical imaging systems 3001, 3002 and 3003 of Embodiment 3 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 7D The magnification chromatic aberration curves of optical imaging systems 3001, 3002, and 3003 of Embodiment 3 are shown, representing the deviations in image height at different points on the imaging plane after light passes through the lens. According to... Figures 7A to 7D It can be seen that the optical imaging system 3001, optical imaging system 3002 and optical imaging system 3003 given in Example 3 can achieve good imaging quality.

[0120] In summary, the optical imaging systems 1001, 1002, 1003, 2001, 2002, 2003, 3001, 3002 and 3003 of Examples 1 to 3 satisfy the relationships shown in Table 10.

[0121]

[0122]

[0123] Table 10

[0124] This application also provides an imaging device, whose 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 system described above.

[0125] 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 system, characterized in that, include: The lens barrel and the lens assembly and spacer assembly disposed within the lens barrel, wherein, The lens group comprises, sequentially from the object side to the image side along the optical axis: The first lens with positive optical power has a convex object side and a convex image side; A second lens with negative optical power has a convex object side and a concave image side. A third lens with positive optical power has a convex object side and a concave image side. The fourth lens, which has optical power, has a convex image-side surface; A fifth lens with optical power; The sixth lens has positive optical power and its object side is convex. The seventh lens has negative optical power and its image-side surface is concave. Wherein, at least one of the fourth lens and the fifth lens has negative optical power; The spacer element group includes: a first spacer element disposed on the image side of the first lens and in at least partial contact with the image side surface of the first lens; a second spacer element disposed on the image side of the second lens and in at least partial contact with the image side surface of the second lens; a fourth spacer element disposed on the image side of the fourth lens and in at least partial contact with the image side surface of the fourth lens; a fifth spacer element disposed on the image side of the fifth lens and in at least partial contact with the image side surface of the fifth lens; and a sixth spacer element disposed on the image side of the sixth lens and in at least partial contact with the image side surface of the sixth lens. The optical imaging system has seven lenses with optical power. The outer diameter D0m of the image-side end face of the lens barrel, the inner diameter d0m of the image-side end face of the lens barrel, the effective focal length f6 of the sixth lens, the effective focal length f7 of the seventh lens, the aperture number Fno of the optical imaging system, and the inner diameter d6s of the object-side surface of the sixth spacer element and the outer diameter D6s of the object-side surface of the sixth spacer element satisfy the following: -46.5186≤f7 / (D0m-d0m)×Fno≤-17.0407 and 4.4939≤f6 / (D6s-d6s)≤11.4113; The inner diameter d5m of the image side of the fifth spacer element, the inner diameter d6m of the image side of the sixth spacer element, the center thickness CT5 of the fifth lens on the optical axis, the center thickness CT6 of the sixth lens on the optical axis, and the air gap T56 between the fifth and sixth lenses on the optical axis satisfy: 5.4942≤(d5m+d6m) / (CT5+T56+CT6)≤6.4158; The radius of curvature R8 of the image side of the fourth lens, the inner diameter d4s of the object side of the fourth spacer element, and the outer diameter D4s of the object side of the fourth spacer element satisfy: -9.3145≤R8 / (d4s+D4s)≤-7.4174. The thickness CP1 of the first spacer element along the optical axis, the thickness CP2 of the second spacer element along the optical axis, the aperture number Fno of the optical imaging system, and the air gap T12 between the first lens and the second lens on the optical axis satisfy: 0.4112≤(CP1+CP2)×Fno / T12≤0.5273.

2. The optical imaging system according to claim 1, characterized in that, The maximum semi-field-of-view (Semi-FOV) of the optical imaging system, the effective focal length f7 of the seventh lens, the thickness CP6 of the sixth spacer element along the optical axis, the center thickness CT7 of the seventh lens on the optical axis, and the air gap T67 between the sixth and seventh lenses on the optical axis satisfy: -5.0614≤tan(Semi-FOV)×f7 / (CP6+T67+CT7)≤-2.3641.

3. The optical imaging system according to claim 1, characterized in that, The radius of curvature R11 of the object side of the sixth lens, the radius of curvature R14 of the image side of the seventh lens, the inner diameter d6s of the object side of the sixth spacer element, and the outer diameter D6m of the image side of the sixth spacer element satisfy: 2.9394≤(R11+R14) / (D6m-d6s)≤7.9423.

4. The optical imaging system according to claim 1, characterized in that, The effective focal length f5 of the fifth lens, the refractive index N4 of the fourth lens, the refractive index N5 of the fifth lens, and the outer diameter D4m of the image side of the fourth spacer element satisfy: 1.3211≤|f5| / (N4+N5) / D4m≤6.1869.

5. The optical imaging system according to claim 1, characterized in that, The outer diameter D5m of the image side of the fifth spacer element, the Abbe number V5 of the fifth lens, the Abbe number V6 of the sixth lens, and the radius of curvature R9 of the object side of the fifth lens satisfy: 14.8689≤|(V6+V5) / R9|×D5m≤32.3295.

6. The optical imaging system according to claim 1, characterized in that, The spacer element group further includes: A third spacer element is positioned on the image side of the third lens and at least partially contacts 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 element, the outer diameter D3s of the object side surface of the third spacer element, and the thickness CP3 of the third spacer element along the optical axis satisfy the following: 0.1607mm≤f3 / (D3s-d3s)×CP3≤2.0898mm.

7. The optical imaging system according to claim 1, characterized in that, The spacer element group further includes: A third spacer element is positioned on the image side of the third lens and at least partially contacts the image side surface of the third lens; wherein, The effective focal length f2 of the second lens, the air gap T23 between the second lens and the third lens on the optical axis, the spacing EP23 between the second spacer element and the third spacer element along the optical axis, and the outer diameter D3s of the object side of the third spacer element and the inner diameter d2m of the image side of the second spacer element satisfy: -66.0647mm≤f2×(D3s-d2m) / (EP23+T23)≤-23.1461mm.

8. The optical imaging system according to claim 1, characterized in that, The radius of curvature R3 of the object side of the second lens, the radius of curvature R4 of the image side of the second lens, the radius of curvature R5 of the object side of the third lens, the radius of curvature R6 of the image side of the third lens, the inner diameter d2s of the object side of the second spacer element, and the outer diameter D2m of the image side of the second spacer element satisfy: R3 / R4>0, R5 / R6>0, and 3.0207≤(R4+R5) / (D2m-d2s)≤6.3132.

9. The optical imaging system according to claim 1, characterized in that, The effective focal length f1 of the first lens, the outer diameter D0s of the object-side end face of the lens barrel, the inner diameter d0s of the object-side end face of the lens barrel, and the air gap EP01 between the object-side end face of the lens barrel and the object-side surface of the first spacer element on the optical axis satisfy: 47.4032mm≤f1×(D0s+d0s) / EP01≤60.1213mm.

10. The optical imaging system according to claim 1, characterized in that, The radius of curvature R1 of the object side surface of the first lens, the inner diameter d1s of the object side surface of the first spacer element, and the outer diameter D1s of the object side surface of the first spacer element satisfy: 0.8584≤R1 / (D1s-d1s)≤2.8353.

11. The optical imaging system according to any one of claims 1 to 4, characterized in that, The thickness CP5 of the fifth spacer element along the optical axis, the thickness CP6 of the sixth spacer element along the optical axis, the spacing EP56 between the fifth and sixth spacers along the optical axis, the effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens, and the effective focal length f7 of the seventh lens satisfy the following: -12.4846≤∣f5×CP5+f6×CP6∣ / (f7×EP56)≤-0.1532.

12. The optical imaging system according to any one of claims 1 to 3, 6-10, characterized in that, The radius of curvature R9 of the object side of the fifth lens, the radius of curvature R8 of the image side of the fourth lens, the outer diameter D5m of the image side of the fifth spacer element, the outer diameter D5s of the object side of the fifth spacer element, the thickness CP5 of the fifth spacer element along the optical axis, and the spacing EP45 between the fourth and fifth spacers along the optical axis satisfy: 0.2592≤(R9 / D5m-R8 / D5s)×(CP5 / EP45)≤10.1452.

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