Optical imaging lens

Abstract

This application discloses an optical imaging lens, comprising: a lens group, the lens group including, along the optical axis from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens having optical power; at least one spacer element, including a second spacer element located between the second lens and the third lens; and a lens barrel having a receiving space for accommodating the lens group and the spacer element, wherein the distance TD from the object side of the first lens to the image side of the seventh lens along the optical axis, the center thickness CT2 of the second lens along the optical axis, the center thickness CT3 of the third lens along the optical axis, the center thickness CT7 of the seventh lens along the optical axis, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the radius of curvature R4 of the image side of the second lens, and the inner diameter d2s of the object side of the second spacer element satisfy: 2.0 < TD / (CT2 + CT3 + CT7) < 3.0; -0.5 < f3 / (R4 / f2*d2s) < 1.0.

Description

Technical Field

[0001] This application relates to the field of optical imaging, and more specifically, to an optical imaging lens. Background Technology

[0002] With the continuous upgrading and iteration of electronic products, and to meet the diverse needs of customers, the performance requirements of various products are gradually increasing, with camera capabilities becoming a key focus. Simultaneously, as electronic products become increasingly smaller, miniaturized lenses are gaining market favor. This environment necessitates that camera performance maintain image quality while achieving a slim and lightweight design.

[0003] In the field of optical imaging lenses, the presence of stray light and deviations in assembly stability significantly affect the image quality. For example, if the optical power settings of the lenses in an optical imaging lens are not properly configured, the deflection paths of light within the lens may become chaotic, leading to stray light. Similarly, if the size of the lens closest to the image side is not properly configured, a satisfactory image plane size may not be achieved. Furthermore, improper design of the position and size of the spacers in an optical imaging lens can also result in chaotic light deflection paths, further contributing to stray light. Moreover, improper design of the position and size of the spacers can also lead to poor stability between the lenses, resulting in poor assembly stability of the optical imaging lens.

[0004] Therefore, how to rationally arrange the lenses and spacers in an optical imaging lens, and how to rationally set the optical parameters of the optical imaging lens, in order to control the light path in the optical imaging lens, improve the manufacturability of each lens, improve the assembly stability of the optical imaging lens, and reduce the low production yield of the optical imaging lens, is one of the urgent problems to be solved in the field of optical imaging. Summary of the Invention

[0005] According to one aspect of this application, an optical imaging lens is provided, comprising a lens group, the lens group including, along the optical axis from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens having optical power; at least one spacer element, the at least one spacer element including a second spacer element located between the second lens and the third lens; and a lens barrel having a receiving space for accommodating the lens group and at least one spacer element, wherein the distance TD from the object side of the first lens to the image side of the seventh lens along the optical axis, the center thickness CT2 of the second lens along the optical axis, the center thickness CT3 of the third lens along the optical axis, the center thickness CT7 of the seventh lens along the optical axis, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the radius of curvature R4 of the image side of the second lens, and the inner diameter d2s of the object side of the second spacer element satisfy: 2.0 < TD / (CT2 + CT3 + CT7) < 3.0; -0.5 < f3 / (R4 / f2) d2s) < 1.0.

[0006] In one embodiment, at least one spacer element further includes a first spacer element located between the first lens and the second lens, wherein the outer diameter D1m of the image-side surface of the first spacer element, the outer diameter D2s of the object-side surface of the second spacer element, the center thickness CT2 of the second lens on the optical axis, and the radius of curvature R4 of the image-side surface of the second lens satisfy: -1.5 < (D1m) D2s) / (R4 CT2) < -0.5.

[0007] In one embodiment, the spacing EP01 between the front end face of the lens barrel and the first spacer element, the center thickness CT1 of the first lens on the optical axis, the air gap T12 between the first lens and the second lens on the optical axis, the radius of curvature R1 of the object side surface of the first lens, and the maximum thickness CP1 of the first spacer element satisfy: -0.6 < EP01 (CT1-T12) / (R1 CP1) < 0.1.

[0008] In one embodiment, the effective focal length f3 of the third lens, the air gap T23 between the second and third lenses on the optical axis, the maximum thickness CP2 of the second spacer element, the inner diameter d2m of the image side of the second spacer element, and the radius of curvature R5 of the object side of the third lens satisfy: 0.5 < f3 (T23+CP2) / (d2m R5) < 1.5.

[0009] In one embodiment, the outer diameter D2s of the object side of the second spacer element, the spacing EP12 between the first and second spacers, the center thickness CT2 of the second lens on the optical axis, and the effective focal length f2 of the second lens satisfy: 1.0 < D2s (CT2 / EP12) / f2 < 2.0.

[0010] In one embodiment, at least one spacer element further includes a third spacer element located between the third lens and the fourth lens, wherein the spacing EP23 between the second spacer element and the third spacer element, the air gap T34 between the third lens and the fourth lens on the optical axis, the maximum thickness CP3 of the third spacer element, and the radius of curvature R7 of the object side surface of the fourth lens satisfy: 0.5 < EP23 (T34 / CP3)) / R7<2.5.

[0011] In one embodiment, the third lens in the lens group with optical power has the largest refractive index, wherein the outer diameter D3s of the object side of the third spacer element, the outer diameter D2m of the image side of the second spacer element, the refractive index N3 of the third lens, the effective focal length f3 of the third lens, and the radius of curvature R6 of the image side of the third lens satisfy: -1.0 < (D3s + D2m) / f3 < 1.0.

[0012] In one embodiment, at least one spacer element further includes a fourth spacer element located between the fourth lens and the fifth lens, wherein the inner diameter d4m of the image-side surface of the fourth spacer element, the outer diameter D4m of the image-side surface of the fourth spacer element, the radius of curvature R9 of the object-side surface of the fifth lens, and the maximum thickness CP4 of the fourth spacer element satisfy: -18.5 < d4m D4m / (R9 CP4) < 6.5.

[0013] In one embodiment, at least one spacer element further includes a fifth spacer element located between the fifth lens and the sixth lens, wherein the center thickness CT5 of the fifth lens on the optical axis, the inner diameter d5m of the image-side surface of the fifth spacer element, the effective focal length of the fifth lens, and the maximum thickness CP5 of the fifth spacer element satisfy: -0.5 < CT5 d5m / (f5 CP5) < 0.5.

[0014] In one embodiment, at least one spacer element further includes a sixth spacer element located between the sixth lens and the seventh lens, wherein the outer diameter D6s of the object side of the sixth spacer element, the radius of curvature R11 of the object side of the sixth lens, the maximum thickness CP6 of the sixth spacer element, and the center thickness CT6 of the sixth lens on the optical axis satisfy: 5.5 < D6s / R11 + CP6 / CT6 < 7.0.

[0015] In one embodiment, the effective focal length f6 of the sixth lens, the spacing EP56 between the fifth and sixth spacers, the air gap T67 between the sixth and seventh lenses on the optical axis, the center thickness CT6 of the sixth lens on the optical axis, and the radius of curvature R12 of the image-side surface of the sixth lens satisfy: 1.0 < f6 (EP56+T67) / (CT6 R12) < 4.5.

[0016] In one embodiment, the outer diameter D6m of the image-side surface of the sixth spacer element, the inner diameter d6m of the image-side surface of the sixth spacer element, and the effective focal length f7 of the seventh lens satisfy: -4.5 < (D6m + d6m) / f7 < -3.0.

[0017] According to another aspect of this application, an optical imaging lens is provided, comprising a lens group, the lens group including, along the optical axis from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens having optical power; at least one spacer element, the at least one spacer element including a first spacer element located between the first lens and the second lens; and a lens barrel having a receiving space for accommodating the lens group and at least one spacer element, wherein the outer diameter D1m of the image side of the first spacer element, the outer diameter D2s of the object side of the second spacer element, the center thickness CT2 of the second lens on the optical axis, and the radius of curvature R4 of the image side of the second lens satisfy: -1.5 < (D1m) D2s) / (R4 CT2) < -0.5.

[0018] According to another aspect of this application, an optical imaging lens is provided, comprising a lens group, the lens group including, along the optical axis from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens having optical power; at least one spacer element, the at least one spacer element including a second spacer element located between the second lens and the third lens; and a lens barrel having a receiving space for accommodating the lens group and at least one spacer element, wherein the effective focal length f3 of the third lens, the air gap T23 between the second lens and the third lens on the optical axis, the maximum thickness CP2 of the second spacer element, the inner diameter d2m of the image side of the second spacer element, and the radius of curvature R5 of the object side of the third lens satisfy: 0.5 < f3 (T23+CP2) / (d2m R5) < 1.5.

[0019] According to another aspect of this application, an optical imaging lens is provided, comprising a lens group, the lens group including, along the optical axis from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens having optical power; at least one spacer element, the at least one spacer element including a fifth spacer element located between the fifth lens and the sixth lens; and a lens barrel having a receiving space for accommodating the lens group and at least one spacer element, wherein the center thickness CT5 of the fifth lens on the optical axis, the inner diameter d5m of the image side surface of the fifth spacer element, the effective focal length of the fifth lens, and the maximum thickness CP5 of the fifth spacer element satisfy: -0.5 < CT5 d5m / (f5 CP5) < 0.5.

[0020] The optical imaging lens provided by the embodiments of this application, by reasonably controlling the focal length and radius of curvature of each lens, and by designing the number, thickness, and inner and outer diameter parameters of the spacer elements, can improve the imaging effect while reasonably controlling the size of the lens. The optical imaging lens provided by the exemplary embodiments of this application employs a seven-element optical system to ensure that the imaging quality meets design requirements. Under the premise that the optical parameters meet the standards, the aperture of the first five optical lenses is compressed, and an auxiliary support design is used to ensure assembly stability, thereby obtaining a smaller upper diameter, allowing it to match more application scenarios and meet more diverse performance requirements. Attached Figure Description

[0021] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0022] Figure 1 A schematic diagram showing the structure and some parameters of an optical imaging lens according to an embodiment of this application is provided;

[0023] Figure 2 A schematic diagram illustrating the elimination of stray light by an optical imaging lens according to an embodiment of this application is shown;

[0024] Figure 3A and Figure 3B A schematic diagram of the structure of an optical imaging lens according to Embodiment 1 of this application is shown;

[0025] Figures 4A to 4D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens according to Embodiment 1 of this application are shown respectively.

[0026] Figure 5A and Figure 5B A schematic diagram of the structure of an optical imaging lens according to Embodiment 2 of this application is shown;

[0027] Figures 6A to 6D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens according to Embodiment 2 of this application are shown respectively.

[0028] Figure 7A and Figure 7B A schematic diagram of the structure of an optical imaging lens according to Embodiment 3 of this application is shown;

[0029] Figures 8A to 8D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens according to Embodiment 3 of this application are shown respectively.

[0030] Figure 9A and Figure 9B A schematic diagram of the structure of an optical imaging lens according to Embodiment 4 of this application is shown; and

[0031] Figures 10A to 10D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens according to Embodiment 4 of this application are shown respectively. Detailed Implementation

[0032] 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.

[0033] 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.

[0034] 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.

[0035] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and its location is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and its location 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, and the surface of each lens closest to the image plane is called the image-side surface. The surface of the lens barrel closest to the subject is called the front face of the lens barrel, and the surface of the lens barrel closest to the image plane is called the rear face of the lens.

[0036] 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.

[0037] 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 formal sense, unless expressly so specified herein.

[0038] 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 groups (i.e., the first lens to the seventh lens), lens barrel structure, and spacer elements 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 structure, spacer elements, etc. of that embodiment.

[0039] The features, principles and other aspects of this application are described in detail below.

[0040] Figure 1A schematic diagram illustrating the structural arrangement and some parameters of an optical imaging lens according to this application is shown. Those skilled in the art will understand that some parameters frequently 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 illustration only shows partial parameters of the lens barrel and spacer elements of an optical imaging system according to this application, to facilitate a better understanding of the invention. Figure 1 As shown, EP12 represents the spacing between the image-side surface of the first spacer element and the object-side surface of the second spacer element along the optical axis; CP1 represents the maximum thickness of the first spacer element along the optical axis; CP2 represents the maximum thickness of the second spacer element along the optical axis; d2s represents the inner diameter of the object-side surface of the second spacer element; d4m represents the inner diameter of the image-side surface of the fourth spacer element; D6m represents the outer diameter of the image-side surface of the sixth spacer element; d6m represents the inner diameter of the image-side surface of the sixth spacer element, and so on.

[0041] refer to Figure 1 As shown, a first aspect of this application provides an optical imaging lens that may include a lens barrel and a lens group mounted within the lens barrel. The lens group may include seven lenses with optical power, namely a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. These seven lenses are arranged sequentially along the optical axis from the object side to the image side. Any two adjacent lenses among the first to seventh lenses may have a gap distance. The lens barrel can accommodate the first to seventh lenses. In an exemplary embodiment, the outer surface of the lens barrel away from the optical axis is parallel to the optical axis.

[0042] According to an exemplary embodiment of this application, each of the first to seventh lenses may have an optical region for optical imaging and a non-optical region extending outward from the outer periphery of the optical region. Generally speaking, the optical region refers to the area of ​​the lens used for optical imaging, while the non-optical region is the structural area of ​​the lens. During the assembly of the optical imaging lens, spacer elements can be set at the non-optical regions of each lens using processes such as adhesive bonding, and each lens can be connected to the lens barrel, i.e., each lens abuts against the inner wall of the lens barrel. During the imaging process of the optical imaging lens, the optical regions of each lens can transmit light from the object to form an optical path, forming the final optical image; while the non-optical regions of each assembled lens are housed in the lens barrel, which cannot transmit light, thus the non-optical regions do not directly participate in the imaging process of the optical imaging lens. It should be noted that, for ease of description, this application describes each lens as divided into two parts: an optical region and a non-optical region. However, it should be understood that the optical region and the non-optical region of the lens can be formed as a whole during the manufacturing process, rather than as two separate parts.

[0043] An optical imaging lens according to an exemplary embodiment of this application further includes at least one spacer element, such as a second spacer element located between a second lens and a third lens, which may abut against a non-optical region on the image-side of the second lens. Exemplarily, the second spacer element may contact both the non-optical region on the image-side of the second lens and the non-optical region on the object-side of the third lens.

[0044] According to an exemplary embodiment of this application, the spacer element may further include a first spacer element located between the first lens and the second lens, a third spacer element located between the third lens and the fourth lens, etc. Exemplarily, the spacer element may include a spacer plate and may also include a spacer ring. By reasonably setting the number, thickness, inner diameter, and outer diameter of the spacer element, it is beneficial to block stray light, improve the imaging quality of the optical imaging lens, and enhance the assembly stability of the optical imaging lens.

[0045] It should be understood that the surface of each spacer element closest to the subject is called the object-side surface of that spacer element, and the surface of each spacer element closest to the imaging plane is called the image-side surface of that spacer element. The surface of the lens barrel closest to the subject is called the object-side end or front end of the lens barrel, and the surface of the lens barrel closest to the imaging plane is called the image-side end or rear end of the lens barrel.

[0046] In an exemplary embodiment, the optical imaging lens according to this application satisfies: 2.0 < TD / (CT2+CT3+CT7) < 3.0, where TD is the distance along the optical axis from the object-side surface of the first lens to the image-side surface of the seventh lens, CT2 is the center thickness of the second lens along the optical axis, CT3 is the center thickness of the third lens along the optical axis, and CT7 is the center thickness of the seventh lens along the optical axis. By limiting TD / (CT2+CT3+CT7) within a reasonable range, it is beneficial to reasonably control the center thicknesses of the second, third, and seventh lenses, making the lens structure more compact and lightweight, achieving lens miniaturization, and avoiding excessive light deflection.

[0047] In an exemplary embodiment, the optical imaging lens according to this application satisfies: -0.5 < f3 / (R4 / f2) d2s) < 1.0, where f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, R4 is the radius of curvature of the image-side surface of the second lens, and d2s is the inner diameter of the object-side surface of the second spacer element. This is achieved by f3 / (R4 / f2) By controlling d2s within a reasonable range, the aperture design of the second and third lenses can be kept from being too large, thus meeting the requirements of miniaturization design. At the same time, in order to meet the optical performance requirements, the ability of the first few lenses to converge light can be improved by designing reasonable focal length and radius of curvature parameters, so that the incident light can meet the performance requirements. In addition, by controlling the inner diameter of the second spacer element, invalid light at the edge can be filtered out, thereby improving the image quality.

[0048] In an exemplary embodiment, the optical imaging lens according to this application satisfies: -1.5 < (D1m) D2s) / (R4 CT2) < -0.5, where D1m is the outer diameter of the image-side surface of the first spacer element, D2s is the outer diameter of the object-side surface of the second spacer element, CT2 is the center thickness of the second lens on the optical axis, and R4 is the radius of curvature of the image-side surface of the second lens. By reasonably controlling the outer diameters of the first and second spacer elements, the lens head diameter is kept within a reasonable design range. Simultaneously, by coordinating the center thickness and radius of curvature parameters of the second lens, the aspect ratio and thickness ratio of the lens are kept within a favorable processing range, thereby allowing for reasonable control of the deflection angle of the principal ray.

[0049] In an exemplary embodiment, the optical imaging lens according to this application satisfies: -0.6 < EP01 (CT1-T12) / (R1 CP1) < 0.1, where EP01 is the gap between the front end face of the lens barrel and the first spacer element, CT1 is the center thickness of the first lens on the optical axis, T12 is the air gap between the first and second lenses on the optical axis, R1 is the radius of curvature of the side surface of the first lens, and CP1 is the maximum thickness of the first spacer element. By reasonably controlling the above air gap and center thickness parameters, the thickness ratio of the first lens can be reasonably controlled, which is beneficial to molding; at the same time, controlling the radius of curvature of the side surface of the first lens can ensure that the incident light angle meets the design requirements, and controlling the thickness of the first spacer element helps to reduce the sensitivity of the first air gap to the overall field curvature and improve product yield.

[0050] In an exemplary embodiment, the optical imaging lens according to this application satisfies: 0.5 < f3 (T23+CP2) / (d2m R5) < 1.5, where f3 is the effective focal length of the third lens, T23 is the air gap between the second and third lenses on the optical axis, CP2 is the maximum thickness of the second spacer element, d2m is the inner diameter of the image side of the second spacer element, and R5 is the radius of curvature of the object side of the third lens. By controlling the above parameters, light can be reasonably diverged at the third lens, improving chip matching accuracy. At the same time, controlling the inner diameter of the spacer element allows edge-dependent light to be absorbed, preventing stray light.

[0051] In an exemplary embodiment, the optical imaging lens according to this application satisfies: 1.0 < D²s (CT2 / EP12) / f2 < 2.0, where D2s is the outer diameter of the side of the second spacer element, EP12 is the spacing between the first and second spacers, CT2 is the center thickness of the second lens on the optical axis, and f2 is the effective focal length of the second lens. By reasonably controlling the above outer diameters, a relatively gradual increase in the lens outer diameter from the head to the waist can be obtained. At the same time, in conjunction with the control of other parameters, the thickness of the second lens can be made more uniform. A reasonable effective focal length helps to reduce aberrations in the edge field of view, shorten the overall length of the optical system, and meet the requirements of thinness and lightness.

[0052] In an exemplary embodiment, the optical imaging lens according to this application satisfies: 0.5 < EP23 (T34 / CP3) / R7 < 2.5, where EP23 is the spacing between the second and third spacers, T34 is the air gap between the third and fourth lenses on the optical axis, CP3 is the maximum thickness of the third spacer, and R7 is the radius of curvature of the object side of the fourth lens. By controlling these parameters, the system sensitivity of the combination of the third and fourth lenses can be reduced, which is beneficial to achieving the characteristics of a large aperture and high resolution in the imaging system, while improving its ability to correct astigmatism and field curvature.

[0053] In an exemplary embodiment, the lens with the highest refractive index among the lenses with optical power in the lens group is the third lens. The optical imaging lens according to this application satisfies: -1.0 < (D3s + D2m) / f3 < 1.0, where D3s is the outer diameter of the object-side surface of the third spacer element, D2m is the outer diameter of the image-side surface of the second spacer element, N3 is the refractive index of the third lens, f3 is the effective focal length of the third lens, and R6 is the radius of curvature of the image-side surface of the third lens. By controlling parameters such as the focal length, radius of curvature, and refractive index of the third lens, the converging light rays entering the third lens through the aperture stop begin to diverge reasonably according to design requirements, which is beneficial for achieving a large image plane characteristic, reducing on-axis chromatic aberration, and ensuring better image quality.

[0054] In an exemplary embodiment, the optical imaging lens may further include a fourth spacer element located between the fourth lens and the fifth lens, the fourth spacer element being in direct contact with the image side of the fourth lens.

[0055] In an exemplary embodiment, the optical imaging lens according to this application satisfies: -18.5 < d4m D4m / (R9 CP4) < 6.5, where d4m is the inner diameter of the image-side surface of the fourth spacer element, D4m is the outer diameter of the image-side surface of the fourth spacer element, R9 is the radius of curvature of the object-side surface of the fifth lens, and CP4 is the maximum thickness of the fourth spacer element. By reasonably controlling the inner and outer diameter parameters of the fourth spacer element, a reasonable annular area parameter of the spacer element can be obtained, which is beneficial to reducing abnormal stray light spots. At the same time, in combination with the radius of curvature of the fifth lens and the maximum thickness of the fourth spacer element, the size of the fourth air gap can be effectively controlled, so that it can better control the field curvature and distortion range, and improve the image quality.

[0056] In an exemplary embodiment, the optical imaging lens may further include a fifth spacer element located between the fifth lens and the sixth lens, the fifth spacer element being in direct contact with the image side of the fifth lens.

[0057] In an exemplary embodiment, the optical imaging lens according to this application satisfies: -0.5 < CT5 d5m / (f5 CP5) < 0.5, where CT5 is the center thickness of the fifth lens on the optical axis, d5m is the inner diameter of the image-side surface of the fifth spacer element, f5 is the effective focal length of the fifth lens, R10 is the radius of curvature of the image-side surface of the fifth lens, and CP5 is the maximum thickness of the fifth spacer element. By controlling the above parameters related to the fifth lens, the manufacturability of the fifth lens is improved, and its contribution range of optical power and its contribution rate of negative spherical aberration can be reasonably controlled, thereby improving image quality.

[0058] In an exemplary embodiment, the optical imaging lens may further include a sixth spacer element located between the sixth lens and the seventh lens, the sixth spacer element being in direct contact with the image side of the sixth lens.

[0059] In an exemplary embodiment, the optical imaging lens according to this application satisfies: 5.5 < D6s / R11 + CP6 / CT6 < 7.0, where D6s is the outer diameter of the object side of the sixth spacer element, R11 is the radius of curvature of the object side of the sixth lens, CP6 is the maximum thickness of the sixth spacer element, and CT6 is the center thickness of the sixth lens on the optical axis. By reasonably controlling the outer diameter of the sixth spacer element, the step difference between the fifth and sixth lenses can be effectively controlled. Simultaneously, by coordinating the radius of curvature, center thickness, and edge thickness data of the sixth lens, the astigmatism of the optical imaging lens and the aperture size of the control system can be effectively balanced, thereby improving the overall brightness of the image.

[0060] In an exemplary embodiment, the optical imaging lens according to this application satisfies: 1.0 < f6 (EP56+T67) / (CT6 R12) < 4.5, where f6 is the effective focal length of the sixth lens, EP56 is the spacing between the fifth and sixth spacers, T67 is the air gap between the sixth and seventh lenses on the optical axis, CT6 is the center thickness of the sixth lens on the optical axis, and R12 is the radius of curvature of the image-side surface of the sixth lens. By satisfying the above conditions, the space ratio of the sixth lens can be reasonably controlled, which is beneficial to ensuring the lens assembly process and realizing the miniaturization of optical lenses.

[0061] In an exemplary embodiment, the optical imaging lens according to this application satisfies: -4.5 < (D6m + d6m) / f7 < -3.0, where D6m is the outer diameter of the image-side surface of the sixth spacer element, d6m is the inner diameter of the image-side surface of the sixth spacer element, f7 is the effective focal length of the seventh lens, and R14 is the radius of curvature of the image-side surface of the seventh lens. By reasonably controlling the inner and outer diameters of the sixth spacer element, stray light anomalies can be effectively controlled, while its effective focal length and radius of curvature can be controlled, so that the outgoing light rays can better match the designed image plane parameters, control the image height of the system, and thus facilitate the miniaturization of the optical imaging lens.

[0062] A second aspect of this application provides an optical imaging lens that may include a lens barrel and a lens group mounted within the lens barrel. The lens group may include seven lenses of optical power, namely a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. These seven lenses are arranged sequentially along the optical axis from the object side to the image side. Any two adjacent lenses among the first to seventh lenses may have a gap distance. The lens barrel can accommodate the first to seventh lenses. In an exemplary embodiment, the outer surface of the lens barrel away from the optical axis is parallel to the optical axis.

[0063] The optical imaging lens according to embodiments of this application further includes at least one spacer element, such as a first spacer element located between a first lens and a second lens. Exemplarily, the first spacer element may contact a non-optical region on the image-side of the first lens and simultaneously contact a non-optical region on the object-side of the second lens.

[0064] According to an exemplary embodiment of this application, the spacer element may further include a second spacer element located between the second lens and the third lens, which may abut against the non-optical region on the image-side surface of the second lens. Exemplarily, the spacer element may include a spacer plate and may also include a spacer ring. By reasonably setting the number, thickness, inner diameter, and outer diameter of the spacer element, it is beneficial to block stray light, improve the imaging quality of the optical imaging lens, and enhance the assembly stability of the optical imaging lens.

[0065] In an exemplary embodiment, the optical imaging lens according to this application satisfies: -1.5 < (D1m) D2s) / (R4 CT2) < -0.5, where D1m is the outer diameter of the image-side surface of the first spacer element, D2s is the outer diameter of the object-side surface of the second spacer element, CT2 is the center thickness of the second lens on the optical axis, and R4 is the radius of curvature of the image-side surface of the second lens. By reasonably controlling the outer diameters of the first and second spacer elements, the lens head diameter is kept within a reasonable design range. Simultaneously, by coordinating the center thickness and radius of curvature parameters of the second lens, the aspect ratio and thickness ratio of the lens are kept within a favorable processing range, thereby allowing for reasonable control of the deflection angle of the principal ray.

[0066] A third aspect of this application provides an optical imaging lens that may include a lens barrel and a lens group mounted within the lens barrel. The lens group may include seven lenses of optical power, namely a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. These seven lenses are arranged sequentially along the optical axis from the object side to the image side. Any two adjacent lenses among the first to seventh lenses may have a gap distance. The lens barrel can accommodate the first to seventh lenses. In an exemplary embodiment, the outer surface of the lens barrel away from the optical axis is parallel to the optical axis.

[0067] An optical imaging lens according to an exemplary embodiment of this application further includes at least one spacer element, such as a second spacer element located between a second lens and a third lens, which may abut against a non-optical region on the image-side of the second lens. Exemplarily, the second spacer element may contact both the non-optical region on the image-side of the second lens and the non-optical region on the object-side of the third lens.

[0068] In an exemplary embodiment, the optical imaging lens according to this application satisfies: 0.5 < f3 (T23+CP2) / (d2m R5) < 1.5, where f3 is the effective focal length of the third lens, T23 is the air gap between the second and third lenses on the optical axis, CP2 is the maximum thickness of the second spacer element, d2m is the inner diameter of the image side of the second spacer element, and R5 is the radius of curvature of the object side of the third lens. By controlling the above parameters, light can be reasonably diverged at the third lens, improving chip matching accuracy. At the same time, controlling the inner diameter of the spacer element allows edge-dependent light to be absorbed, preventing stray light.

[0069] A fourth aspect of this application provides an optical imaging lens that may include a lens barrel and a lens group mounted within the lens barrel. The lens group may include seven lenses of optical power: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. These seven lenses are arranged sequentially along the optical axis from the object side to the image side. Any two adjacent lenses from the first to the seventh lens may have a gap between them. The lens barrel can accommodate the first to the seventh lenses. In an exemplary embodiment, the outer surface of the lens barrel away from the optical axis is parallel to the optical axis.

[0070] An optical imaging lens according to an exemplary embodiment of this application further includes at least one spacer element, such as a fourth spacer element located between a fourth lens and a fifth lens, which may abut against a non-optical region on the image-side of the fourth lens. Exemplarily, the fourth spacer element may contact both the non-optical region on the image-side of the fourth lens and the non-optical region on the object-side of the fifth lens.

[0071] In an exemplary embodiment, the optical imaging lens according to this application satisfies: -18.5 < d4m D4m / (R9 CP4) < 6.5, where d4m is the inner diameter of the image-side surface of the fourth spacer element, D4m is the outer diameter of the image-side surface of the fourth spacer element, R9 is the radius of curvature of the object-side surface of the fifth lens, and CP4 is the maximum thickness of the fourth spacer element. By reasonably controlling the inner and outer diameter parameters of the fourth spacer element, a reasonable annular area parameter of the spacer element can be obtained, which is beneficial to reducing abnormal stray light spots. At the same time, in combination with the radius of curvature of the fifth lens and the maximum thickness of the fourth spacer element, the size of the fourth air gap can be effectively controlled, so that it can better control the field curvature and distortion range, and improve the image quality.

[0072] In the 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 center to the periphery of the lens. Unlike a spherical lens, which has a constant curvature from the center to the 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.

[0073] Optionally, at least one of the object-side surface and image-side surface of each of the first, second, third, fourth, fifth, sixth, and seventh lenses is an aspherical mirror. Optionally, both the object-side surface and image-side surface of each of the first, second, third, fourth, fifth, sixth, and seventh lenses are aspherical mirrors.

[0074] However, those skilled in the art will understand that the number of lenses constituting the optical imaging lens can be varied to obtain the various results and advantages described herein without departing from the technical solutions claimed in this application. For example, although seven lenses are described as an example in the embodiment, the optical imaging lens is not limited to including seven lenses. If desired, the optical imaging lens may also include other numbers of lenses. At least one spacer element may be included between any two adjacent lenses.

[0075] In an exemplary embodiment, the optical imaging lens according to this application further includes an aperture stop. The aperture stop can constrain the light path and control the light intensity. Optionally, the optical imaging lens may also include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface. This application proposes an optical imaging lens with characteristics such as a large image plane, good assembly stability, high light-gathering ability, and high imaging quality. The optical imaging lens 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, material, center thickness of each lens, and on-axis spacing between each lens, incident light can be effectively converged, the overall optical length of the imaging lens can be reduced, and the manufacturability of the imaging lens can be improved, making the optical imaging lens more conducive to production and processing. This application, through the rational combination of lenses, spacers, and lens barrels, facilitates the uniform distribution of lenses, enhances the light-gathering ability, and improves imaging quality.

[0076] like Figure 2 As shown, stray light enters the optical imaging lens from the object side and exits from the image side. Through a reasonable design of focal length and radius of curvature parameters, the light-gathering ability of the first few lenses in the lens group can be improved, ensuring that the incident light meets performance requirements. Simultaneously, by designing the number and inner diameter of the second spacer element (which directly contacts the image side of the second lens) between the second and third lenses, and the third spacer element (which directly contacts the image side of the third lens) between the third and fourth lenses, effective blocking of stray light at the lens edges can be achieved, filtering out invalid edge light and improving image quality.

[0077] Embodiments 1 to 4 of the optical imaging lens applicable to the above exemplary embodiments will be further described below with reference to the accompanying drawings and examples.

[0078] Example 1

[0079] Figure 3A and Figure 3B Schematic diagrams of the optical imaging lenses of Examples 1-1 and 1-2 according to Embodiment 1 of this application are shown respectively.

[0080] like Figure 3A and Figure 3B As shown, the optical imaging lens barrel P0 and the lens group. The lens group may include, in sequence from the object side to the image side: first lens E1, aperture stop STO (not shown), second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter (not shown), and imaging plane S17 (not shown).

[0081] The optical imaging lens according to embodiments of this application may further include at least one spacer element. Exemplarily, each spacer element may include at least one spacer plate, such as a first spacer element P1; each spacer element may also include a spacer plate and a spacer ring, for example, a fifth spacer element may include a spacer plate P5 and a spacer ring P5b.

[0082] In this embodiment, such as Figure 3A and Figure 3B As shown, at least one spacer element may include: a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element (P5 and P5b), and a sixth spacer element P6. The actual parameters of each spacer element in the optical imaging lenses of Examples 1-1 and 1-2 are different.

[0083] In this embodiment, the first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being convex. 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 negative optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has negative optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. 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 and an image-side surface S16. Light from the object passes sequentially through each surface S1 to S16 and is finally imaged onto the imaging surface S17.

[0084] Table 1 shows the basic parameters of the optical imaging lens of Example 1, where the units for radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0085]

[0086] Table 1

[0087] 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, and the surface shape of each aspherical lens is... The following aspherical formulas can be used for limitation:

[0088] (1)

[0089] in, For an aspherical surface along the optical axis at a height of h When the position is such that the distance from the vertex of the non-spherical surface is the sag; c For the paraxial curvature of an aspherical surface, c =1 / R (i.e., paraxial curvature) c (The reciprocal of the radius of curvature R in Table 1 above). k The conic coefficient; Ai Is it an aspherical first i -th order correction coefficients.

[0090] Tables 2-1 and 2-2 provide the higher-order coefficients that can be used for each aspherical mirror S1-S14 in Example 1. A 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 66 , A 28 and A 30 .

[0091]

[0092] Table 2-1

[0093]

[0094] Table 2-2

[0095] Figure 4A The on-axis chromatic aberration curve of the optical imaging system of Embodiment 1 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 4B The astigmatism curves of the optical imaging system of Embodiment 1 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 4C The distortion curves of the optical imaging system of Example 1 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 4D The magnification chromatic aberration curve of the optical imaging system of Embodiment 1 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the lens. According to... Figures 4A to 4D It can be seen that the optical imaging system given in Example 1 can achieve good imaging quality.

[0096] Example 2

[0097] Figure 5A and Figure 5B Schematic diagrams of optical imaging lenses according to Examples 2-1 and 2-2 of Embodiment 2 of this application are shown respectively. In Embodiment 2 and the following embodiments, for the sake of brevity, descriptions similar to those in Embodiment 1 will be omitted.

[0098] like Figure 5A and Figure 5B As shown, an optical imaging lens may include a lens barrel P0, a lens group, and at least one spacer element. The lens group, from the object side to the image side, may sequentially include: a first lens E1, an aperture stop STO (not shown), a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter (not shown), and an imaging plane S17 (not shown). At least one spacer element may include: a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element (P5 and P5b), and a sixth spacer element (P6 and P6b). The actual parameters of the spacer elements in the optical imaging lenses of Examples 2-1 and 2-2 are different.

[0099] In this embodiment, the first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being convex. 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 negative optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has negative optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. 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 and an image-side surface S16. Light from the object passes sequentially through each surface S1 to S16 and is finally imaged onto the imaging surface S17.

[0100] Table 3 shows the basic parameters of the optical imaging lens of Example 2, where the units for radius of curvature, thickness / distance, and focal length are millimeters (mm).

[0101]

[0102] Table 3

[0103] In Embodiment 2, the object-side surface and image-side surface of any one of the first lens E1 to the seventh lens E7 are aspherical, and the surface shape of each aspherical lens is... The formula (1) given in Example 1 above can be used for limitation. Tables 4-1 and 4-2 give the higher-order coefficients that can be used for each aspherical mirror S1-S14 in Example 2. A 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 66 , A 28 and A 30 .

[0104]

[0105] Table 4-1

[0106]

[0107] Table 4-2

[0108] Figure 6A The on-axis chromatic aberration curve of the optical imaging system of Embodiment 2 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 6B The astigmatism curves of the optical imaging system of Embodiment 2 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 6C The distortion curves of the optical imaging system of Example 2 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 6DThe magnification chromatic aberration curve of the optical imaging system of Embodiment 2 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the lens. According to... Figures 6A to 6D It can be seen that the optical imaging system given in Example 2 can achieve good imaging quality.

[0109] Example 3

[0110] Figure 7A and Figure 7B Schematic diagrams of the optical imaging lenses of Examples 3-1 and 3-2 according to Embodiment 3 of this application are shown respectively.

[0111] like Figure 7A and Figure 7B As shown, an optical imaging lens may include a lens barrel P0, a lens group, and at least one spacer element. The lens group, from the object side to the image side, may sequentially include: a first lens E1, an aperture stop STO (not shown), a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter (not shown), and an imaging plane S17 (not shown). At least one spacer element may include: a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, and a sixth spacer element P6. The actual parameters of the spacer elements in the optical imaging lenses of Examples 3-1 and 3-2 are different.

[0112] In this embodiment, the first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being convex. 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 negative optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being concave. 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 and an image-side surface S16. Light from the object passes sequentially through each surface S1 to S16 and is finally imaged onto the imaging surface S17.

[0113] Table 5 shows the basic parameters of the optical imaging lens of Example 3, where the units for radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0114]

[0115] Table 5

[0116] In embodiment 3, the object-side surface and image-side surface of any one of the first lens E1 to the seventh lens E7 are aspherical, and the surface shape of each aspherical lens is... The formula (1) given in Example 1 above can be used for limitation. Tables 6-1 and 6-2 give the higher-order coefficients that can be used for each aspherical mirror S1-S14 in Example 3. A 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 66 , A 28 and A 30 .

[0117]

[0118] Table 6-1

[0119]

[0120] Table 6-2

[0121] Figure 8A The on-axis chromatic aberration curve of the optical imaging system of Embodiment 3 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 8B The astigmatism curves of the optical imaging system of Example 3 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 8C The distortion curves of the optical imaging system of Example 3 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 8D The magnification chromatic aberration curve of the optical imaging system of Example 3 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the lens. According to... Figures 8A to 8D It can be seen that the optical imaging system given in Example 3 can achieve good imaging quality.

[0122] Example 4

[0123] Figure 9Aand Figure 9B Schematic diagrams of the optical imaging lenses of Examples 4-1 and 4-2 according to Embodiment 4 of this application are shown respectively.

[0124] like Figure 9A and Figure 9B As shown, an optical imaging lens may include a lens barrel P0, a lens group, and at least one spacer element. The lens group, from the object side to the image side, may sequentially include: a first lens E1, an aperture stop STO (not shown), a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter (not shown), and an imaging plane S17 (not shown). At least one spacer element may include: a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, and a sixth spacer element P6. The actual parameters of the spacer elements in the optical imaging lenses of Examples 4-1 and 4-2 are different.

[0125] In this embodiment, the first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being convex. 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 negative optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being concave. 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 and an image-side surface S16. Light from the object passes sequentially through each surface S1 to S16 and is finally imaged onto the imaging surface S17.

[0126] Table 7 shows the basic parameters of the optical imaging lens of Example 4, where the units for radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0127]

[0128] Table 7

[0129] In embodiment 4, the object-side surface and image-side surface of any one of the first lens E1 to the seventh lens E7 are aspherical, and the surface shape of each aspherical lens is... The formula (1) given in Example 1 above can be used for limitation. Tables 8-1 and 8-2 give the higher-order coefficients that can be used for each aspherical mirror S1-S14 in Example 4. A 4 , A 6 ,A 8 , A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 66 , A 28 and A 30 .

[0130]

[0131] Table 8-1

[0132]

[0133] Table 8-2

[0134] Figure 10A The on-axis chromatic aberration curve of the optical imaging system of Embodiment 4 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 10B The astigmatism curves of the optical imaging system of Example 4 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 10C The distortion curves of the optical imaging system of Example 4 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 10D The magnification chromatic aberration curve of the optical imaging system of Example 4 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the lens. According to... Figures 10A to 10D It can be seen that the optical imaging system given in Example 4 can achieve good imaging quality.

[0135] Table 9 below shows the optical parameters of the optical imaging lenses for each example of Embodiments 1 to 4, such as the focal length of each lens, the thickness and inner and outer diameters of each spacer element, and the spacing between elements. The units for inner and outer diameters, distances, and focal lengths are all millimeters (mm).

[0136]

[0137] Table 9

[0138] In summary, each of the examples in Examples 1 to 4 satisfies the conditional expressions shown in Table 10 below.

[0139]

[0140] Table 10

[0141] 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 lens, characterized in that, The optical imaging lens includes: The lens group comprises, along the optical axis from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, each having optical power. At least one spacer element, said at least one spacer element including a second spacer element located between the second lens and the third lens; and The lens barrel has a receiving space for accommodating the lens group and the at least one spacer element. The optical imaging lens contains seven lenses with optical power. The first lens has negative optical power, and its object side is convex while its image side is concave. The second lens has positive optical power, and its object side is convex, as is its image side; The third lens has negative optical power, and its object side is convex while its image side is concave. The fourth lens has negative optical power, and its object side is convex while its image side is concave. The fifth lens has negative optical power and its image-side surface is concave. The sixth lens has positive optical power, and its object side is convex while its image side is concave. The seventh lens has negative optical power, and its object side is convex while its image side is concave. The distance TD from the object-side surface of the first lens to the image-side surface of the seventh lens along the optical axis, the center thickness CT2 of the second lens on the optical axis, the center thickness CT3 of the third lens on the optical axis, the center thickness CT7 of the seventh lens on the optical axis, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the radius of curvature R4 of the image-side surface of the second lens, and the inner diameter d2s of the object-side surface of the second spacer element satisfy: 2.16≤TD / (CT2+CT3+CT7)≤2.20; 0.61≤f3 / (R4 / f2) d2s) < 1.

0.

2. The optical imaging lens according to claim 1, wherein, The at least one spacer element further includes a first spacer element located between the first lens and the second lens. The outer diameter D1m of the image side of the first spacer element, the outer diameter D2s of the object side of the second spacer element, the center thickness CT2 of the second lens on the optical axis, and the radius of curvature R4 of the image side of the second lens satisfy: -1.37≤(D1m) D2s) / (R4 CT2)≤-0.

77.

3. The optical imaging lens according to claim 1, wherein, The at least one spacer element further includes a first spacer element located between the first lens and the second lens. The following parameters are satisfied: the distance EP01 between the front end face of the lens barrel and the first spacer element; the center thickness CT1 of the first lens on the optical axis; the air gap T12 between the first and second lenses on the optical axis; the radius of curvature R1 of the object side surface of the first lens; and the maximum thickness CP1 of the first spacer element. (CT1-T12) / (R1 CP1) < 0.

1.

4. The optical imaging lens according to claim 1, wherein, The effective focal length f3 of the third lens, the air gap T23 between the second and third lenses on the optical axis, the maximum thickness CP2 of the second spacer element, the inner diameter d2m of the image side of the second spacer element, and the radius of curvature R5 of the object side of the third lens satisfy: -0.12≤f3 (T23+CP2) / (d2m R5)≤-0.

07.

5. The optical imaging lens according to claim 1, wherein, The at least one spacer element further includes a first spacer element located between the first lens and the second lens. The outer diameter D2s of the object side of the second spacer element, the spacing EP12 between the first spacer element and the second spacer element, the center thickness CT2 of the second lens on the optical axis, and the effective focal length f2 of the second lens satisfy: 1.38 ≤ D2s (CT2 / EP12) / f2 < 2.

0.

6. The optical imaging lens according to claim 1, wherein, The at least one spacer element further includes a third spacer element located between the third lens and the fourth lens. The spacing EP23 between the second and third spacers, the air gap T34 between the third and fourth lenses on the optical axis, the maximum thickness CP3 of the third spacer, and the radius of curvature R7 of the object side surface of the fourth lens satisfy: 0.87 ≤ EP23 (T34 / CP3)) / R7≤1.

59.

7. The optical imaging lens according to claim 1, wherein, Among the lenses with optical power in the lens group, the third lens has the highest refractive index, and the at least one spacer element further includes a third spacer element located between the third lens and the fourth lens. The outer diameter D3s of the object side of the third spacer, the outer diameter D2m of the image side of the second spacer, the refractive index N3 of the third lens, the effective focal length f3 of the third lens, and the radius of curvature R6 of the image side of the third lens satisfy: -0.70≤(D3s+D2m) / f3≤-0.

60.

8. The optical imaging lens according to claim 1, wherein, The at least one spacer element further includes a fourth spacer element located between the fourth lens and the fifth lens. The inner diameter d4m of the image-side surface of the fourth spacer element, the outer diameter D4m of the image-side surface of the fourth spacer element, the radius of curvature R9 of the object-side surface of the fifth lens, and the maximum thickness CP4 of the fourth spacer element satisfy: -18.18 ≤ d4m D4m / (R9 CP4)≤6.

11.

9. The optical imaging lens according to claim 1, wherein, The at least one spacer element further includes a fifth spacer element located between the fifth lens and the sixth lens. The center thickness CT5 of the fifth lens on the optical axis, the inner diameter d5m of the image-side surface of the fifth spacer element, the effective focal length of the fifth lens, and the maximum thickness CP5 of the fifth spacer element satisfy: -0.30≤CT5 d5m / (f5 CP5)≤-0.

23.

10. The optical imaging lens according to any one of claims 1-9, wherein, The at least one spacer element further includes a sixth spacer element located between the sixth lens and the seventh lens. The outer diameter D6s of the object side of the sixth spacer element, the radius of curvature R11 of the object side of the sixth lens, the maximum thickness CP6 of the sixth spacer element, and the center thickness CT6 of the sixth lens on the optical axis satisfy: 5.82≤D6s / R11+CP6 / CT6≤6.

53.

11. The optical imaging lens according to any one of claims 1-8, wherein, The at least one spacer element further includes a fifth spacer element located between the fifth lens and the sixth lens, and a sixth spacer element located between the sixth lens and the seventh lens. The effective focal length f6 of the sixth lens, the spacing EP56 between the fifth and sixth spacers, the air gap T67 between the sixth and seventh lenses on the optical axis, the center thickness CT6 of the sixth lens on the optical axis, and the radius of curvature R12 of the image-side surface of the sixth lens satisfy: 2.68 ≤ f6 (EP56+T67) / (CT6 R12)≤3.

46.

12. The optical imaging lens according to any one of claims 1-9, wherein, The at least one spacer element further includes a sixth spacer element located between the sixth lens and the seventh lens. The outer diameter D6m of the image side of the sixth spacer element, the inner diameter d6m of the image side of the sixth spacer element, and the effective focal length f7 of the seventh lens satisfy: -4.14≤(D6m+d6m) / f7≤-3.39.

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