Optical imaging lens

Abstract

The utility model discloses an optical imaging lens. The optical imaging lens comprises a lens cone assembly, an optical lens group and a spacing element group, wherein the optical lens group and the spacing element group are arranged in the lens cone assembly; the optical lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged from the object side to the image side along the optical axis. The spacing element group comprises a sixth spacing element which is arranged on the image side surface of the sixth lens and is in contact with the image side surface of the sixth lens; the number of the lenses with the focal power of the optical imaging lens is seven. The air interval T67 of the sixth lens and the seventh lens on the optical axis, the center thickness CT6 of the sixth lens on the optical axis and the center thickness CT7 of the seventh lens on the optical axis meet the following condition: T67 / (CT6 + CT7) is greater than or equal to 2.89 and less than or equal to 4.12; the curvature radius R11 of the object side surface of the sixth lens, the curvature radius R12 of the image side surface of the sixth lens, the outer diameter D6s of the object side surface of the sixth spacing element and the inner diameter d6s of the object side surface of the sixth spacing element meet the following conditions: 0.65 lt; (R12 / R11) / (D6s-d6s) lt; and 4.95%.

Description

Technical Field

[0001] The present application relates to the field of optical devices, and in particular to an optical imaging lens. Background Art

[0002] As the consumer market's demand for mobile phone camera lens photography continues to change, the requirements for optical imaging lenses are becoming increasingly complex and diverse. Optical imaging lenses perform differently in different application scenarios.

[0003] Seven-element optical imaging lenses have become mainstream, finding widespread application in mobile phones, virtual reality (VR), augmented reality (AR), machine vision, and other fields. The rear lens significantly impacts the overall imaging performance of a seven-element optical imaging lens. For example, the large air gap between the sixth and seventh lenses results in poor assembly stability and a high level of stray light, which in turn affects image quality. Utility Model Content

[0004] In one aspect, the present application provides an optical imaging lens comprising a barrel assembly, an optical lens group disposed within the barrel assembly, and a spacer group. The optical lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, arranged in order from the object side to the image side along the optical axis; and the spacer group comprises a sixth spacer disposed on and in contact with the image side surface of the sixth lens. The optical imaging lens comprises seven lenses having optical power. An air gap T67 between the sixth lens and the seventh lens on the optical axis, a center thickness CT6 of the sixth lens on the optical axis, and a center thickness CT7 of the seventh lens on the optical axis satisfy the following conditions: 2.89≤T67 / (CT6+CT7)≤4.12; a curvature radius R11 of the object-side surface of the sixth lens, a curvature radius R12 of the image-side surface of the sixth lens, an outer diameter D6s of the object-side surface of the sixth spacer element, and an inner diameter d6s of the object-side surface of the sixth spacer element satisfy the following conditions: 0.65<(R12 / R11) / (D6s-d6s)<4.95.

[0005] According to an exemplary embodiment of the present application, the lens barrel assembly includes a first lens barrel and a second lens barrel, the first lens, the second lens, the third lens, the fourth lens and the fifth lens are placed in the first lens barrel, and the sixth lens and the seventh lens are placed in the second lens barrel.

[0006] According to an exemplary embodiment of the present application, the distance EP206 between the object side end surface of the second barrel and the sixth spacer element along the optical axis, the maximum thickness CP6 of the sixth spacer element and the center thickness CT6 of the sixth lens on the optical axis meet the following conditions: 3.5 <EP206 / (CT6+CP6)<5.55。

[0007] According to an exemplary embodiment of the present application, the distance EP206 between the object-side end surface of the second lens barrel and the sixth spacer element along the optical axis and the effective focal length f6 of the sixth lens satisfy: -20.37≤f6 / EP206≤-11.54.

[0008] According to an exemplary embodiment of the present application, the spacer element group further includes a first spacer element disposed on the image side surface of the first lens and in contact with the image side surface of the first lens; the effective focal length f1 of the first lens, the distance EP101 along the optical axis between the object side end surface of the first lens barrel and the first spacer element, and the maximum thickness CP1 of the first spacer element satisfy: 9.1 <f1 / (EP101+CP1)<12.5。

[0009] According to an exemplary embodiment of the present application, the spacer element group further includes a second spacer element disposed on the image side surface of the second lens and in contact with the image side surface of the second lens; the effective focal length f2 of the second lens, the spacing distance T23 between the second lens and the third lens on the optical axis, the maximum thickness CP2 of the second spacer element, and the center thickness CT2 of the second lens on the optical axis satisfy the following conditions: -11.2 <f2 / (T23+CP2+CT2)<-6.15。

[0010] According to an exemplary embodiment of the present application, the spacer element group further includes a first spacer element disposed on the image side surface of the first lens and in contact with the image side surface of the first lens, and a second spacer element disposed on the image side surface of the second lens and in contact with the image side surface of the second lens; a distance EP12 between the first spacer element and the second spacer element along the optical axis and a spacing distance T12 between the first lens and the second lens on the optical axis satisfy: 5.2 <EP12 / T12<18.65。

[0011] According to an exemplary embodiment of the present application, the spacer element group further includes a third spacer element disposed on the image side surface of the third lens and in contact with the image side surface of the third lens, and a fourth spacer element disposed on the image side surface of the fourth lens and in contact with the image side surface of the fourth lens. The curvature radius R5 of the object side surface of the third lens is greater than zero, the curvature radius R6 of the image side surface of the third lens is less than zero, the curvature radius R7 of the object side surface of the fourth lens is greater than zero, and the curvature radius R8 of the image side surface of the fourth lens is less than zero. The center thickness CT3 of the third lens on the optical axis, the maximum thickness CP3 of the third spacer element, the center thickness CT4 of the fourth lens on the optical axis, and the maximum thickness CP4 of the fourth spacer element satisfy: 1.6 <CT3×CP3 / (CT4×CP4)<2.95。

[0012] According to an exemplary embodiment of the present application, the spacer element group further includes a second spacer element disposed on the image side surface of the second lens and in contact with the image side surface of the second lens, and a third spacer element disposed on the image side surface of the third lens and in contact with the image side surface of the third lens; a distance EP23 between the second spacer element and the third spacer element along the optical axis and a spacing distance T34 between the third lens and the fourth lens on the optical axis satisfy: 1.9 <EP23 / T34<3.5。

[0013] According to an exemplary embodiment of the present application, the spacer element assembly further includes a first spacer element disposed on and in contact with the image-side surface of the first lens. The image-side surface of the first lens has a curvature radius R2 greater than zero, the object-side surface of the second lens has a curvature radius R3 greater than zero, and the image-side surface of the first lens has a curvature radius R2, an outer diameter D1m of the image-side surface of the first spacer element, a curvature radius R3 of the object-side surface of the second lens, and an inner diameter d1m of the image-side surface of the first spacer element satisfy the following relationship: 2.2 < (R2 × D1m) / (R3 × d1m) ≤ 4.44.

[0014] According to an exemplary embodiment of the present application, the spacer element group further includes a second spacer element disposed on the image side surface of the second lens and in contact with the image side surface of the second lens. The curvature radius R4 of the image side surface of the second lens is greater than zero, and the curvature radius R4 of the image side surface of the second lens, the refractive index N4 of the fourth lens, the outer diameter D2s of the object side surface of the second spacer element, and the inner diameter d2s of the object side surface of the second spacer element satisfy the following conditions: 2.25 <R4×N4 / (D2s-d2s)<4.2。

[0015] According to an exemplary embodiment of the present application, the spacer element group also includes a third spacer element placed on the image side surface of the third lens and in contact with the image side surface of the third lens, and a fourth spacer element placed on the image side surface of the fourth lens and in contact with the image side surface of the fourth lens; the effective focal length f4 of the fourth lens and the distance EP34 between the third spacer element and the fourth spacer element along the optical axis satisfy: -8.93≤f4 / EP34≤-6.33.

[0016] According to an exemplary embodiment of the present application, the first lens has positive optical power and its object-side surface is convex. The second lens has negative optical power. The third lens has positive optical power. The fourth lens has negative optical power. The fifth lens has positive optical power, its object-side surface is convex, and its image-side surface is convex. The sixth lens has negative optical power, its object-side surface is concave, and its image-side surface is convex. The seventh lens has negative optical power, its object-side surface is concave, and its image-side surface is concave.

[0017] The optical imaging lens provided herein utilizes seven lenses. By controlling the optical imaging lens to satisfy the requirement of "2.89 ≤ T67 / (CT6 + CT7) ≤ 4.12," and by providing a large air gap between the sixth and seventh lenses, the center thicknesses of the sixth and seventh lenses can be constrained within a reasonable range, facilitating the molding of the sixth and seventh lenses while improving their assembly stability. However, in this case, the non-effective diameter portion of the sixth lens exhibits a significant amount of internally reflected stray light, thereby affecting the imaging quality of the optical imaging lens. Therefore, by controlling the optical imaging lens to satisfy the requirement of "0.65 < (R12 / R11) / (D6s - d6s) < 4.95," the shape of the sixth lens can be constrained. Furthermore, by constraining the inner and outer diameters of the object-side surface of the sixth spacer, the object-side bandwidth of the sixth spacer (i.e., the light-shielding area of ​​the image-side surface of the sixth lens) can be controlled. This facilitates the sixth spacer to block light emitted from the non-effective diameter portion of the sixth lens. This reduces stray light while not blocking effective light, thereby enhancing the imaging quality of the optical imaging lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Other features, objects and advantages of the present application will become more apparent from the detailed description of the non-limiting embodiments made with reference to the following drawings. In the drawings:

[0019] Figure 1 shows a parameter annotation diagram of the optical imaging lens according to the present application;

[0020] Figure 2 1 shows a schematic structural diagram of an optical imaging lens according to Example 1 of the present application;

[0021] Figure 3 1 shows a schematic structural diagram of an optical imaging lens according to Example 2 of the present application;

[0022] Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens according to Example 1 or 2 of the present application are respectively shown;

[0023] Figure 8 1 shows a schematic structural diagram of an optical imaging lens according to Example 3 of the present application;

[0024] Figure 9 1 shows a schematic structural diagram of an optical imaging lens according to Example 4 of the present application;

[0025] Figure 10 、 Figure 11 、 Figure 12 、 Figure 13 axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens according to Example 3 or 4 of the present application are respectively shown;

[0026] Figure 14 1 shows a schematic structural diagram of an optical imaging lens according to Example 5 of the present application;

[0027] Figure 15 1 shows a schematic structural diagram of an optical imaging lens according to Example 6 of the present application;

[0028] Figure 16 、 Figure 17 、 Figure 18 、 Figure 19 axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens according to Example 5 or 6 of the present application are respectively shown;

[0029] Figure 20 1 shows a schematic structural diagram of an optical imaging lens according to Example 7 of the present application;

[0030] Figure 21 1 shows a schematic structural diagram of an optical imaging lens according to Example 8 of the present application;

[0031] Figure 22 、 Figure 23 、 Figure 24 、 Figure 25 axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens according to Example 7 or 8 of the present application are respectively shown;

[0032] Figure 26 and Figure 27 The stray light simulation diagram and optical path diagram are shown when the optical imaging lens meets T67 / (CT6+CT7)=4.12 and (R12 / R11) / (D6s-d6s)=0.54 respectively;

[0033] Figure 28 and Figure 29 The stray light simulation diagram and optical path diagram are shown when the optical imaging lens meets T67 / (CT6+CT7)=4.12 and (R12 / R11) / (D6s-d6s)=5.12 respectively;

[0034] Figure 30 A stray light simulation diagram is shown when the optical imaging lens satisfies T67 / (CT6+CT7)=4.12 and (R12 / R11) / (D6s-d6s)=1.60;

[0035] Figure 31A stray light simulation diagram is shown when the optical imaging lens satisfies T67 / (CT6+CT7)=4.12 and (R12 / R11) / (D6s-d6s))=1.84. DETAILED DESCRIPTION

[0036] In order to better understand the present application, various aspects of the present application are described in detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application and are not intended to limit the scope of the present application in any way.

[0037] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0038] In this article, the paraxial region refers to the area near the optical axis. If a lens surface is convex and the location of the convex surface is undefined, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the location of the concave surface is undefined, 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.

[0039] The optical imaging lens of the exemplary embodiments of the present application can be simulated using software and / or tools such as ZEMAX and CODEV. Alternatively, the optical imaging lens can be simulated using CODEV software. During simulation using such software and / or tools, the surface profile of each lens can be appropriately adjusted based on the surface profile model provided by the software and / or tool.

[0040] It should also be understood that the terms "include," "comprising," "having," "including," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. It should be noted that in this specification, the terms "first," "second," "third," and so on, are used only to distinguish one feature from another, and do not represent any limitation on the features.

[0041] Unless otherwise defined, all terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Terms should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and will not be interpreted in an idealized or overly formal sense unless expressly defined as such herein.

[0042] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0043] The features, principles and other aspects of the present application are described in detail below.

[0044] Figure 1 : is a parameter-labeled diagram according to an exemplary embodiment of the present application. Figure 1 , d1m represents the inner diameter of the image-side surface of the first spacer element, D1m represents the outer diameter of the image-side surface of the first spacer element, d2s represents the inner diameter of the object-side surface of the second spacer element, D2s represents the outer diameter of the object-side surface of the second spacer element, d6s represents the inner diameter of the object-side surface of the sixth spacer element, D6s represents the outer diameter of the object-side surface of the sixth spacer element, CP1 represents the maximum thickness of the first spacer element, CP2 represents the maximum thickness of the second spacer element, CP3 represents the maximum thickness of the third spacer element, CP4 represents the maximum thickness of the fourth spacer element, CP6 represents the maximum thickness of the sixth spacer element, EP12 represents the distance between the first spacer element and the second spacer element along the optical axis, EP23 represents the distance between the second spacer element and the third spacer element along the optical axis, EP34 represents the distance between the third spacer element and the fourth spacer element along the optical axis, EP101 represents the distance between the object-side end surface of the first lens barrel and the first spacer element along the optical axis, and EP206 represents the distance between the object-side end surface of the second lens barrel and the sixth spacer element along the optical axis.

[0045] refer to Figure 2 、 Figure 3 、 Figure 8 、 Figure 9 、 Figure 14 、 Figure 15 、 Figure 20 and Figure 21 In a first aspect, the present application provides an optical imaging lens. The optical imaging lens may include an optical lens assembly. The optical lens assembly may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, arranged in order from the object side to the image side along the optical axis. Among the first to seventh lenses, any two adjacent lenses may have an air space between them.

[0046] 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 negative optical power. The fifth lens may have positive optical power. The sixth lens may have negative optical power. The seventh lens may have negative optical power.

[0047] In an exemplary embodiment, the object-side surface of the first lens may be convex, and the image-side surface may be concave.

[0048] In an exemplary embodiment, the object-side surface of the second lens may be convex, and the image-side surface may be concave.

[0049] In exemplary embodiments, the object-side surface of the third lens may be convex, and the image-side surface may be convex.

[0050] In example embodiments, the object-side surface of the fourth lens may be convex, and the image-side surface may be concave.

[0051] In example embodiments, the object-side surface of the fifth lens may be a convex surface, and the image-side surface may be a convex surface.

[0052] In example embodiments, the object-side surface of the sixth lens may be concave, and the image-side surface may be convex.

[0053] In example embodiments, the object-side surface of the seventh lens may be concave, and the image-side surface may be concave.

[0054] In an exemplary embodiment, the number of lenses having optical power of the optical imaging lens may be seven.

[0055] In an exemplary embodiment, the optical imaging lens may further include a stop, and the stop may be disposed between the first lens and the second lens.

[0056] In an exemplary embodiment, the first through fifth lenses constitute a first lens group, and the position of the first lens group relative to the image plane on the image side is fixed. The sixth and seventh lenses constitute a second lens group, and the second lens group is movable along the optical axis relative to the first lens group, i.e., the distance of the second lens group relative to the first lens group on the optical axis is adjustable. As the distance between the subject and the optical imaging lens decreases from far to near, the optical imaging lens can be adjusted by adjusting the distance on the optical axis between the second lens group and the first lens group.

[0057] In an exemplary embodiment, the optical imaging lens may further include a lens barrel assembly, which may include a first lens barrel and a second lens barrel arranged in sequence along the optical axis from the object side to the image side. The first lens, the second lens, the third lens, the fourth lens, and the fifth lens may be assembled within the first lens barrel. The sixth lens and the seventh lens may be assembled within the second lens barrel. Accordingly, the first lens barrel is a fixed assembly whose position relative to the image plane is fixed; the second lens barrel is a movable assembly that can move with the movement of the second lens group during the focusing process of the optical imaging lens.

[0058] In an exemplary embodiment, the optical imaging lens may further include a spacer element group, which may include one or more of a first spacer element, a second spacer element, a third spacer element, a fourth spacer element, and a sixth spacer element. For example, the first spacer element, the second spacer element, the third spacer element, or the fourth spacer element may be placed within the first lens barrel. For example, the sixth spacer element may be placed within the second lens barrel. Proper use of spacers can effectively mitigate stray light risks, reduce image quality interference, and thereby improve the imaging quality of the optical imaging lens.

[0059] In an exemplary embodiment, the outer peripheral surface of at least one lens in the optical lens assembly may have a trimmed portion and a non-trimmed portion, and the outer diameter of the trimmed portion of the lens may be smaller than the outer diameter of the non-trimmed portion of the lens. When the outer peripheral surface of a lens has a trimmed portion, the outer diameter of the lens generally refers to the outer diameter of the non-trimmed portion of the lens. For example, the outer diameter of the object-side surface of a lens refers to the outer diameter of the portion of the non-trimmed portion of the lens closest to the object side, and the outer diameter of the image-side surface of a lens refers to the outer diameter of the portion of the non-trimmed portion of the lens closest to the image side.

[0060] In an exemplary embodiment, the outer circumference of at least one spacer element in the spacer element group may have a trimmed portion and a non-trimmed portion, and the outer diameter of the trimmed portion of the spacer element may be smaller than the outer diameter of the non-trimmed portion of the spacer element. When the outer circumference of the spacer element has a trimmed portion, the outer diameter of the spacer element generally refers to the outer diameter of the non-trimmed portion of the spacer element. For example, the outer diameter of the object-side surface of the spacer element refers to the outer diameter of the portion of the non-trimmed portion of the spacer element closest to the object side, while the outer diameter of the image-side surface of the spacer element refers to the outer diameter of the portion of the non-trimmed portion of the spacer element closest to the image side.

[0061] In an exemplary embodiment, the spacer element group may further include auxiliary spacers and / or secondary auxiliary spacers. For example, the spacer element group may include one or more of a second auxiliary spacer, a second auxiliary spacer, a third auxiliary spacer, a third auxiliary spacer, a fourth auxiliary spacer, a fourth auxiliary spacer, a sixth auxiliary spacer, and a sixth auxiliary spacer. The second auxiliary spacer may be disposed on the image side of the second spacer element and at least partially contact the image side of the second spacer element. The second auxiliary spacer may be disposed on the image side of the second spacer element and at least partially contact the image side of the second spacer element. The third auxiliary spacer may be disposed on the image side of the third spacer element and at least partially contact the image side of the third spacer element. The third auxiliary spacer may be disposed on the image side of the third spacer element and at least partially contact the image side of the third spacer element. The fourth auxiliary spacer may be disposed on the image side of the fourth spacer element and at least partially contact the image side of the fourth spacer element. The fourth auxiliary spacer may be disposed on the image side of the fourth spacer element and at least partially contact the image side of the fourth spacer element. The sixth auxiliary spacer element may be disposed on the image side surface of the sixth spacer element and at least partially contact the image side surface of the sixth spacer element. The sixth auxiliary spacer element may be disposed on the image side surface of the sixth auxiliary spacer element and at least partially contact the image side surface of the sixth auxiliary spacer element.

[0062] In an exemplary embodiment, the spacer element group may include a sixth spacer element positioned on and in contact with the image-side surface of the sixth lens. The optical axis air spacing T67 between the sixth and seventh lenses, the optical axis center thickness CT6 of the sixth lens, and the optical axis center thickness CT7 of the seventh lens may satisfy the following conditions: 2.89 ≤ T67 / (CT6 + CT7) ≤ 4.12. The object-side surface radius R11 of the sixth lens, the image-side surface radius R12 of the sixth lens, the object-side surface outer diameter D6s of the sixth spacer element, and the object-side surface inner diameter d6s of the sixth spacer element may satisfy the following conditions: 0.65 < (R12 / R11) / (D6s - d6s) < 4.95. By controlling the optical imaging lens to satisfy the condition "2.89 ≤ T67 / (CT6 + CT7) ≤ 4.12," while maintaining a larger air spacing between the sixth and seventh lenses, the center thicknesses of the sixth and seventh lenses can be constrained within a reasonable range, facilitating molding of the sixth and seventh lenses while improving assembly stability. However, in this case, the non-effective diameter portion of the sixth lens element generates a significant amount of internally reflected stray light, thereby affecting the imaging quality of the optical imaging lens. Therefore, by controlling the optical imaging lens to satisfy the condition "0.65 < (R12 / R11) / (D6s - d6s) < 4.95," the shape of the sixth lens element can be constrained. Furthermore, by constraining the inner and outer diameters of the object-side surface of the sixth spacer element, the object-side bandwidth of the sixth spacer element (i.e., the light-shielding area of ​​the image-side surface of the sixth lens element) can be controlled. This facilitates the sixth spacer element to block light emitted from the non-effective diameter portion of the sixth lens element. This reduces stray light without blocking effective light, thereby enhancing the imaging quality of the optical imaging lens.

[0063] The following combination Figure 26 、 Figure 27 、 Figure 28 、 Figure 29 、 Figure 30 and Figure 31 To describe the imaging effect of the optical imaging lens. Figure 26 and Figure 27 The stray light simulation diagram and optical path diagram of the optical imaging lens satisfying T67 / (CT6+CT7)=4.12 and (R12 / R11) / (D6s-d6s)=0.54 respectively; Figure 28 and Figure 29 The stray light simulation diagram and optical path diagram for an optical imaging lens that meets T67 / (CT6+CT7)=4.12 and (R12 / R11) / (D6s-d6s)=5.12. Figure 30 A stray light simulation diagram is shown for an optical imaging lens that satisfies T67 / (CT6+CT7)=4.12 and (R12 / R11) / (D6s-d6s)=1.60. Figure 31The stray light simulation diagram showing that the optical imaging lens satisfies T67 / (CT6+CT7)=4.12 and (R12 / R11) / (D6s-d6s)=1.84 is shown.

[0064] When the optical imaging lens satisfies T67 / (CT6+CT7)=4.12 and (R12 / R11) / (D6s-d6s)=0.54, the curvature radii of the object side and the image side of the sixth lens are not set reasonably, which will cause an increase in the stray light of the optical imaging lens (as Figure 26 ). When the optical imaging lens satisfies T67 / (CT6+CT7)=4.12 and (R12 / R11) / (D6s-d6s)=5.12, the bandwidth of the sixth spacer element is small, and its shielding effect on the non-effective diameter area of the image side of the sixth lens is poor, resulting in an increase in the stray light of the optical imaging lens (as Figure 28 ). However, when the optical imaging lens satisfies T67 / (CT6+CT7)=4.12 and (R12 / R11) / (D6s-d6s)=1.60, or when the optical imaging lens satisfies T67 / (CT6+CT7)=4.12 and (R12 / R11) / (D6s-d6s)=1.84, the bandwidth of the sixth spacer element is within a reasonable range, and it can effectively shield the non-effective diameter area of the image side of the sixth lens, and the stray light of the optical imaging lens is significantly reduced (as Figure 30 and Figure 31 ). It can be seen that by controlling the optical imaging lens to satisfy 2.89≤T67 / (CT6+CT7)≤4.12 and 0.65<(R12 / R11) / (D6s-d6s)<4.95, the stray light can be reduced and the imaging quality of the optical imaging lens can be improved.

[0065] In an exemplary embodiment, the spacer element group may include a sixth spacer element disposed on the image side of the sixth lens and in contact with the image side of the sixth lens. The distance EP206 along the optical axis between the object side end face of the second barrel and the sixth spacer element, the maximum thickness CP6 of the sixth spacer element, and the central thickness CT6 of the sixth lens on the optical axis may satisfy: 3.5<EP206 / (CT6+CP6)<5.55. Reasonably configuring the relationship between the distance along the optical axis between the object side end face of the second barrel and the sixth spacer element, the maximum thickness of the sixth spacer element, and the central thickness of the sixth lens on the optical axis can constrain the bearing thickness of the object side end face of the second barrel, the edge thickness and the central thickness of the sixth lens, which is beneficial to controlling the shape of the sixth lens, meeting the molding requirements of the sixth lens, and making the object side end face of the second barrel have a larger thickness, facilitating the assembly and bearing of the sixth lens; at the same time, the maximum thickness of the sixth spacer element can also be limited, reducing the deformation risk of the sixth spacer element while meeting the molding requirements of the sixth spacer element and improving the assembly stability of the seventh lens.

[0066] In an exemplary embodiment, the spacer element group may include a sixth spacer element disposed on and in contact with the image side surface of the sixth lens. The distance EP206 along the optical axis between the object-side end face of the second barrel and the sixth spacer element and the effective focal length f6 of the sixth lens may satisfy: -20.37 ≤ f6 / EP206 ≤ -11.54. By restricting the range of the ratio of the distance along the optical axis between the object-side end face of the second barrel and the sixth spacer element to the effective focal length of the sixth lens, the thickness of the object-side end face of the second barrel and the edge thickness of the sixth lens can be reasonably allocated. While ensuring that the edge thickness of the sixth lens meets the molding requirements, the object-side end face of the second barrel has a relatively large thickness, facilitating the stable support of the sixth lens and improving the assembly stability of the sixth lens; at the same time, the effective focal length and the edge thickness of the sixth lens can restrict the shape profile of the sixth lens, which is beneficial to the molding of the sixth lens.

[0067]

[0067] In an exemplary embodiment, the spacer element group may include a first spacer element disposed on and in contact with the image side surface of the first lens. The effective focal length f1 of the first lens, the distance EP101 along the optical axis between the object-side end face of the first barrel and the first spacer element, and the maximum thickness CP1 of the first spacer element may satisfy: 9.1 < f1 / (EP101 + CP1) < 12.5. By reasonably configuring the relationship between the effective focal length of the first lens, the distance along the optical axis between the object-side end face of the first barrel and the first spacer element, and the maximum thickness of the first spacer element, the thickness of the object-side end face of the first barrel and the edge thickness of the first lens can be reasonably allocated. While ensuring that the edge thickness of the first lens meets the molding requirements, the object-side end face of the first barrel has a relatively large thickness, facilitating the stable support of the first lens and improving the assembly stability of the first lens; at the same time, the effective focal length of the first lens can be controlled to converge the light rays, thereby making the overall image height of the lens meet the design requirements.

[0068] In an exemplary embodiment, the spacer element group may include a second spacer element disposed on and in contact with the image side surface of the second lens. The effective focal length f2 of the second lens, the distance T23 between the second lens and the third lens on the optical axis, the maximum thickness CP2 of the second spacer element, and the central thickness CT2 of the second lens on the optical axis satisfy: -11.2 < f2 / (T23 + CP2 + CT2) < -6.15. By controlling the above conditional expression, the shape of the second lens can be restricted, making the propagation path of the light rays in the second lens reasonable, so that the height and illuminance of the light rays meet the design requirements of the lens; at the same time, the shape of the second spacer element can also be restricted to reduce the stray light of the optical imaging lens and improve the imaging quality of the optical imaging lens.

[0069] In an exemplary embodiment, the spacer element group may include a first spacer element disposed on the image side of the first lens and in contact with the image side of the first lens, and a second spacer element disposed on the image side of the second lens and in contact with the image side of the second lens. The distance EP12 between the first spacer element and the second spacer element along the optical axis and the spacing distance T12 between the first lens and the second lens on the optical axis satisfy: 5.2 < EP12 / T12 < 18.65. By controlling the above conditional expression, the profile of the image side of the first lens, the air gap between the first lens and the second lens on the optical axis, and the profile of the object side of the second lens can be constrained, thereby controlling the thickness of the first spacer element, which is beneficial to adjusting the edge thickness of the second lens by the thicknesses of the first spacer element and the second spacer element. When ensuring the molding of the second lens, the edge thickness of the second lens is made smaller, reducing the internal stray light of the second lens and improving the stray light of the optical imaging lens.

[0070] In an exemplary embodiment, the spacer element group may include a third spacer element disposed on the image side of the third lens and in contact with the image side of the third lens, and a fourth spacer element disposed on the image side of the fourth lens and in contact with the image side of the fourth lens. The radius of curvature R5 of the object side of the third lens is greater than zero, the radius of curvature R6 of the image side of the third lens is less than zero, the radius of curvature R7 of the object side of the fourth lens is greater than zero, and the radius of curvature R8 of the image side of the fourth lens is less than zero. The central thickness CT3 of the third lens on the optical axis, the maximum thickness CP3 of the third spacer element, the central thickness CT4 of the fourth lens on the optical axis, and the maximum thickness CP4 of the fourth spacer element satisfy: 1.6 < CT3×CP3 / (CT4×CP4) < 2.95. By controlling the above conditional expression, the shape of the effective diameter part of the third lens and the fourth lens can be constrained, which is beneficial to controlling the propagation direction of light between the third lens and the fourth lens, raising the light height, and making the light meet the image plane height requirement; at the same time, the maximum thicknesses of the third spacer element and the fourth spacer element can be constrained within a reasonable range, which is beneficial to adjusting the edge thicknesses of the third lens and the fourth lens, making the overall thicknesses of the third lens and the fourth lens evenly distributed, and facilitating the molding of the third lens and the fourth lens.

[0071] In an exemplary embodiment, the spacer element group may include a second spacer element disposed on the image side of the second lens and in contact with the image side of the second lens, and a third spacer element disposed on the image side of the third lens and in contact with the image side of the third lens. The distance EP23 along the optical axis between the second spacer element and the third spacer element and the spacing distance T34 between the third lens and the fourth lens on the optical axis satisfy: 1.9 < EP23 / T34 < 3.5. By controlling the above conditional expression, the edge thickness of the third lens can be constrained within a reasonable range. While ensuring the smooth molding of the third lens, the edge thickness of the third lens is made smaller, reducing the internal stray light of the third lens, which is beneficial to controlling the stray light state of the third lens; at the same time, the ratio of the edge thickness of the third lens to the air gap between the third lens and the fourth lens on the optical axis can also be restricted, making the overall contour of the third lens more reasonable, so as to ensure that the transmission of light inside the third lens meets the design requirements.

[0072] In an exemplary embodiment, the spacer element group may include a first spacer element disposed on the image side of the first lens and in contact with the image side of the first lens. The radius of curvature R2 of the image side of the first lens is greater than zero, the radius of curvature R3 of the object side of the second lens is greater than zero, and the radius of curvature R2 of the image side of the first lens, the outer diameter D1m of the image side of the first spacer element, the radius of curvature R3 of the object side of the second lens, and the inner diameter d1m of the image side of the first spacer element satisfy: 2.2 < (R2 × D1m) / (R3 × d1m) ≤ 4.44. By controlling the above conditional expression, the inner diameter of the image side of the first spacer element can be constrained, which is beneficial to controlling the incident height of light on the object side of the second lens and making the light height meet the design requirements; at the same time, the bandwidth of the first spacer element can also be controlled by the inner and outer diameters of the image side of the first spacer element. While ensuring that the processability of the first spacer element meets the requirements, the first spacer element effectively blocks the non-effective light emitted from the first lens, reducing the stray light between the first lens and the second lens.

[0073] In an exemplary embodiment, the spacer element group may include a second spacer element disposed on the image side of the second lens and in contact with the image side of the second lens. The radius of curvature R4 of the image side of the second lens is greater than zero, and the radius of curvature R4 of the image side of the second lens, the refractive index N4 of the fourth lens, the outer diameter D2s of the object side of the second spacer element, and the inner diameter d2s of the object side of the second spacer element satisfy: 2.25 < R4×N4 / (D2s - d2s) < 4.2. By controlling the above conditional expression, the bandwidth of the second spacer element can be constrained within a certain range, so that the second spacer element effectively blocks the optical path between the non-effective diameter part of the second lens and the non-effective diameter part of the third lens, reduces the stray light propagation between the second lens and the third lens, and improves the shooting quality of the optical imaging lens; at the same time, the incident height of the light on the object side of the third lens can also be controlled by the radius of curvature of the image side of the second lens and the inner diameter of the object side of the second spacer element, so that the second spacer element does not block the effective light, ensuring that the illuminance of the optical imaging lens meets the requirements.

[0074] In an exemplary embodiment, the spacer element group may include a third spacer element disposed on the image side of the third lens and in contact with the image side of the third lens, and a fourth spacer element disposed on the image side of the fourth lens and in contact with the image side of the fourth lens. The effective focal length f4 of the fourth lens and the distance EP34 along the optical axis between the third spacer element and the fourth spacer element satisfy: -8.93 ≤ f4 / EP34 ≤ -6.33. By reasonably configuring the ratio of the effective focal length of the fourth lens to the distance along the optical axis between the third spacer element and the fourth spacer element, the effective focal length of the fourth lens and the edge thickness of the fourth lens can be constrained within a certain range, thereby restricting the overall shape of the fourth lens, which is beneficial to the shaping of the fourth lens; at the same time, the stray light of the fourth lens can also be reduced by controlling the edge thickness of the fourth lens.

[0075] The optical imaging lens according to the above embodiment of the present application may employ seven lenses, at least one spacer element, and at least one lens barrel. By reasonably allocating the parameters of each lens, each spacer element, and the lens barrel, the risk of stray light of the optical imaging lens can be reduced, and the imaging quality and assembly stability of the optical imaging lens can be improved.

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

[0077] A second aspect of the present application provides an optical imaging lens. The optical imaging lens may include a lens barrel assembly, a spacer element group disposed within the lens barrel assembly, and an optical lens group. The optical lens group may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in sequence along the optical axis from the object side to the image side. The optical imaging lens has seven lenses with a given optical power. The spacer element group may include a third spacer element disposed on the image side surface of the third lens and in contact with the image side surface of the third lens, and a fourth spacer element disposed on the image side surface of the fourth lens and in contact with the image side surface of the fourth lens.

[0078] The effective focal length f4 of the fourth lens and the distance EP34 between the third and fourth spacer elements along the optical axis satisfy the following relationship: -8.93 ≤ f4 / EP34 ≤ -6.33. By properly configuring the ratio of the effective focal length of the fourth lens to the distance between the third and fourth spacer elements along the optical axis, the effective focal length of the fourth lens and the edge thickness of the fourth lens can be constrained within a specific range, thereby restricting the overall shape of the fourth lens and facilitating its formation. Furthermore, controlling the edge thickness of the fourth lens can also reduce stray light from the fourth lens.

[0079] However, it should be understood by those skilled in the art that, without departing from the technical solution claimed in the present application, the number of lenses constituting the optical system can be changed to obtain the various results and advantages described in this specification.

[0080] Specific embodiments of the optical system applicable to the above-mentioned embodiments will be further described below with reference to the accompanying drawings.

[0081] Example 1

[0082] The following reference Figure 2 The optical imaging lens according to Example 1 of the present application is described.

[0083] like Figure 2 As shown, the optical imaging lens includes a lens barrel assembly, a spacer element group, and an optical lens group. The lens barrel assembly includes a first lens barrel and a second lens barrel. The optical lens group 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, arranged in sequence along the optical axis from the object side to the image side. A stop STO (not shown) can be disposed between the first lens E1 and the second lens E2. The first lens E1, the second lens E2, the third lens E3, the fourth lens E4, and the fifth lens E5 are disposed within the first lens barrel, and the sixth lens E6 and the seventh lens E7 are disposed within the second lens barrel.

[0084] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has negative optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being convex. The sixth lens E6 has negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being convex. The seventh lens E7 has negative optical power, with its object-side surface S13 being concave and its image-side surface S14 being concave. In this example, an optical element, such as a filter, may be further provided on the image side of the seventh lens E7. The optical element may have an object-side surface S15 (not shown) and an image-side surface S16 (not shown). Light from an object passes through the surfaces S1 to S16 in sequence and is finally imaged on an imaging surface S17 (not shown).

[0085] The spacer assembly may include a first spacer P1, a second spacer P2, a third spacer P3a, a third auxiliary spacer P3b, a third auxiliary spacer P3c, a fourth spacer P4, a sixth spacer P6a, a sixth auxiliary spacer P6b, and a sixth auxiliary spacer P6c. The spacers prevent excess light from entering the next lens during the imaging process, while also providing better support between the lens and the lens barrel, enhancing the structural stability of the optical imaging lens.

[0086] Table 1 shows the basic parameters of the optical imaging lens of Example 1, wherein the units of curvature radius and thickness / distance are all millimeters (mm).

[0087]

[0088]

[0089] Table 1

[0090] In this embodiment, the object-side surface and the image-side surface of any lens among the first lens E1 to the seventh lens E7 are both aspherical surfaces. The surface shape of each aspherical lens can be defined by, but is not limited to, the following aspherical surface formula:

[0091]

[0092] Where x is the distance vector from the vertex of the aspheric surface at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the correction coefficient for the i-th order of the aspheric surface. Table 2 lists the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for each aspheric surface S1 to S14 in Example 1.

[0093] Face number A4 A6 A8 A10 A12 A14 A16 S1 -2.5619E-01 -3.7020E-02 4.4260E-03 1.2708E-03 -3.1220E-04 -8.1169E-04 -1.7088E-04 S2 -7.5283E-02 -5.6531E-02 2.2442E-02 -5.8360E-03 2.1913E-03 -3.1250E-03 1.7377E-03 S3 -2.7505E-01 1.6834E-02 2.2537E-03 -4.2537E-03 2.7231E-03 -3.0718E-03 1.6131E-03 S4 -5.3146E-01 5.6741E-02 -1.0857E-02 1.0820E-04 2.2687E-04 -7.6226E-04 3.2813E-04 S5 4.5481E-03 -2.3251E-02 8.7466E-03 -2.2851E-04 -6.7416E-04 -9.0720E-05 -6.8158E-05 S6 8.3279E-01 -1.9854E-01 3.7702E-02 -9.2538E-03 1.6876E-03 -4.3466E-04 2.4808E-04 S7 -6.5994E-02 -1.3346E-02 1.7231E-02 -2.4852E-03 -3.9865E-03 1.9061E-03 -3.5356E-04 S8 -1.3062E+00 1.7485E-01 -2.4773E-02 1.2613E-02 -9.3922E-03 3.2477E-03 -4.3367E-04 S9 -6.6934E-01 -1.5790E-02 1.6911E-03 2.7123E-03 -2.8515E-03 8.9761E-04 8.2986E-04 S10 -7.7298E-02 -2.8254E-02 7.2301E-04 6.3920E-04 4.8488E-05 2.5531E-04 6.4754E-04 S11 7.7146E-01 -7.0667E-02 6.0726E-03 -4.3275E-03 3.3116E-04 -2.9003E-04 1.7797E-04 S12 8.5134E-01 -5.3306E-02 4.9599E-03 -4.2666E-03 -3.6926E-04 -1.0004E-04 1.7076E-04 S13 -1.1832E+00 2.7001E-01 -2.8461E-02 2.2171E-02 -6.9187E-03 1.8861E-03 -1.5100E-03 S14 -2.4037E+00 3.7544E-01 -1.2582E-01 4.4638E-02 -1.8769E-02 7.9569E-03 -3.8903E-03 Face number A18 A20 A22 A24 A26 A28 A30 S1 -7.9679E-05 7.5272E-06 9.0615E-06 -1.1363E-05 -2.1731E-07 0.0000E+00 0.0000E+00 S2 -8.1551E-04 2.1059E-04 -9.4729E-09 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 -6.5754E-04 1.5250E-04 -1.5927E-05 3.6204E-06 0.0000E+00 0.0000E+00 0.0000E+00 S4 -1.8005E-04 6.9941E-05 1.1284E-05 -3.3359E-06 -4.7478E-07 0.0000E+00 0.0000E+00 S5 9.4576E-06 9.8512E-05 3.3320E-05 -1.6022E-05 0.0000E+00 0.0000E+00 0.0000E+00 S6 -2.7710E-04 1.2916E-04 5.6253E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S7 -1.3033E-04 1.1461E-05 4.8891E-08 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S8 9.5413E-05 -1.7511E-04 -5.5504E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S9 5.0272E-05 -1.8508E-04 1.3180E-05 -3.0008E-05 4.7680E-06 4.0293E-08 0.0000E+00 S10 -1.1811E-04 -7.5774E-06 -5.5382E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S11 -2.1461E-04 1.3321E-04 7.1651E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S12 -2.5041E-05 4.7008E-05 1.3541E-06 5.5572E-08 0.0000E+00 0.0000E+00 0.0000E+00 S13 4.2879E-04 -1.8643E-04 9.8526E-05 -1.1090E-04 9.3872E-05 6.3458E-06 5.0636E-05 S14 1.7781E-03 -8.0952E-04 4.1203E-04 -1.4279E-04 1.8485E-04 1.4911E-06 7.2471E-05

[0094] Table 2

[0095] Example 2

[0096] The following is based on Figure 3 The optical imaging lens according to Example 2 of the present application is described.

[0097] like Figure 3 As shown, the optical imaging lens includes a lens barrel assembly, a spacer element group, and an optical lens group. The lens barrel assembly includes a first lens barrel and a second lens barrel. The optical lens group 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, arranged in sequence along the optical axis from the object side to the image side. A stop STO (not shown) can be disposed between the first lens E1 and the second lens E2. The first lens E1, the second lens E2, the third lens E3, the fourth lens E4, and the fifth lens E5 are disposed within the first lens barrel, and the sixth lens E6 and the seventh lens E7 are disposed within the second lens barrel.

[0098] The spacer element group may include a first spacer element P1, a second spacer element P2a, a second auxiliary spacer element P2c, a third spacer element P3a, a third auxiliary spacer element P3b, a third auxiliary spacer element P3c, a fourth spacer element P4 and a sixth spacer element P6.

[0099] The structure of the optical lens assembly of this embodiment is the same as that of Example 1. That is, the basic parameter table of the optical imaging lens of this embodiment is the same as Table 1, and the aspheric coefficient table is the same as Table 2. This embodiment differs from Example 1 in that the structure and dimensions of at least some of the elements in the lens barrel assembly and the spacer element group are different.

[0100] Figure 4 The axial chromatic aberration curve of the optical imaging lens of Example 1 or 2 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 5 The astigmatism curve of the optical imaging lens of Example 1 or 2 is shown, which represents the meridional field curvature and the sagittal field curvature. Figure 6 The distortion curve of the optical imaging lens of Example 1 or 2 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 7 The chromatic aberration curve of the optical imaging lens of Example 1 or 2 is shown, which represents the aberration of different image heights on the imaging surface after the light passes through the lens. Figures 4 to 7 It can be seen that the optical imaging lens of Example 1 or 2 can achieve good imaging quality.

[0101] Example 3

[0102] The following reference Figure 8 The optical imaging lens according to Example 3 of the present application is described.

[0103] like Figure 8 As shown, the optical imaging lens includes a lens barrel assembly, a spacer element group, and an optical lens group. The lens barrel assembly includes a first lens barrel and a second lens barrel. The optical lens group 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, arranged in sequence along the optical axis from the object side to the image side. A stop STO (not shown) can be disposed between the first lens E1 and the second lens E2. The first lens E1, the second lens E2, the third lens E3, the fourth lens E4, and the fifth lens E5 are disposed within the first lens barrel, and the sixth lens E6 and the seventh lens E7 are disposed within the second lens barrel.

[0104] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has negative optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being convex. The sixth lens E6 has negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being convex. The seventh lens E7 has negative optical power, with its object-side surface S13 being concave and its image-side surface S14 being concave. In this example, an optical element, such as a filter, may be further provided on the image side of the seventh lens E7. The optical element may have an object-side surface S15 (not shown) and an image-side surface S16 (not shown). Light from an object passes through the surfaces S1 to S16 in sequence and is finally imaged on an imaging surface S17 (not shown).

[0105] The spacer element group may include a first spacer element P1, a second spacer element P2, a third spacer element P3a, a third auxiliary spacer element P3b, a third auxiliary spacer element P3c, a fourth spacer element P4a, a fourth auxiliary spacer element P4b, a fourth auxiliary spacer element P4c, a sixth spacer element P6a, a sixth auxiliary spacer element P6b, and a sixth auxiliary spacer element P6c. The spacers can block excess light from entering the next lens during the imaging process, while also providing better support between the lens and the lens barrel, thereby enhancing the structural stability of the optical imaging lens.

[0106] Table 3 shows the basic parameters of the optical imaging lens of Example 3, wherein the units of curvature radius and thickness / distance are all millimeters (mm).

[0107]

[0108] Table 3

[0109] In this embodiment, both the object-side surface and the image-side surface of each of the first lens element E1 through the seventh lens element E7 are aspherical surfaces. Table 4 lists the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 of the aspherical mirror surfaces S1 through S14 that can be used in Example 3.

[0110]

[0111]

[0112] Table 4

[0113] Example 4

[0114] The following is based on Figure 9 An optical imaging lens according to Example 4 of the present application is described.

[0115] like Figure 9 As shown, the optical imaging lens includes a lens barrel assembly, a spacer element group, and an optical lens group. The lens barrel assembly includes a first lens barrel and a second lens barrel. The optical lens group 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, arranged in sequence along the optical axis from the object side to the image side. A stop STO (not shown) can be disposed between the first lens E1 and the second lens E2. The first lens E1, the second lens E2, the third lens E3, the fourth lens E4, and the fifth lens E5 are disposed within the first lens barrel, and the sixth lens E6 and the seventh lens E7 are disposed within the second lens barrel.

[0116] The spacer element group may include a first spacer element P1, a second spacer element P2a, a second auxiliary spacer element P2b, a third spacer element P3a, a third auxiliary spacer element P3b, a third auxiliary spacer element P3c, a fourth spacer element P4a, a fourth auxiliary spacer element P4b, a fourth auxiliary spacer element P4c and a sixth spacer element P6.

[0117] The structure of the optical lens assembly of this embodiment is identical to that of Example 3. Specifically, the basic parameter table of the optical imaging lens of this embodiment is identical to Table 3, and the aspheric coefficient table is identical to Table 4. This embodiment differs from Example 3 in that the structure and dimensions of at least some of the elements in the lens barrel assembly and the spacer element assembly are different.

[0118] Figure 10 The axial chromatic aberration curve of the optical imaging lens of Example 3 or 4 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 11 The astigmatism curve of the optical imaging lens of Example 3 or 4 is shown, which represents the meridional field curvature and the sagittal field curvature. Figure 12 The distortion curve of the optical imaging lens of Example 3 or 4 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 13 The chromatic aberration curve of the optical imaging lens of Example 3 or 4 is shown, which represents the aberration of different image heights on the imaging surface after the light passes through the lens. Figures 10 to 13 It can be seen that the optical imaging lens of Example 3 or 4 can achieve good imaging quality.

[0119] Example 5

[0120] The following reference Figure 14 The optical imaging lens according to Example 5 of the present application is described.

[0121] like Figure 14 As shown, the optical imaging lens includes a lens barrel assembly, a spacer element group, and an optical lens group. The lens barrel assembly includes a first lens barrel and a second lens barrel. The optical lens group 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, arranged in sequence along the optical axis from the object side to the image side. A stop STO (not shown) can be disposed between the first lens E1 and the second lens E2. The first lens E1, the second lens E2, the third lens E3, the fourth lens E4, and the fifth lens E5 are disposed within the first lens barrel, and the sixth lens E6 and the seventh lens E7 are disposed within the second lens barrel.

[0122] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has negative optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being convex. The sixth lens E6 has negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being convex. The seventh lens E7 has negative optical power, with its object-side surface S13 being concave and its image-side surface S14 being concave. In this example, an optical element, such as a filter, may be further provided on the image side of the seventh lens E7. The optical element may have an object-side surface S15 (not shown) and an image-side surface S16 (not shown). Light from an object passes through the surfaces S1 to S16 in sequence and is finally imaged on an imaging surface S17 (not shown).

[0123] The spacer element group may include a first spacer element P1, a second spacer element P2a, a second auxiliary spacer element P2b, a second auxiliary spacer element P2c, a third spacer element P3a, a third auxiliary spacer element P3b, a third auxiliary spacer element P3c, a fourth spacer element P4a, a fourth auxiliary spacer element P4b, a fourth auxiliary spacer element P4c, a sixth spacer element P6a, a sixth auxiliary spacer element P6b, and a sixth auxiliary spacer element P6c. The spacers can block excess light from entering the next lens during the imaging process, while also providing better support between the lens and the lens barrel, thereby enhancing the structural stability of the optical imaging lens.

[0124] Table 5 shows the basic parameters of the optical imaging lens of Example 5, where the units of curvature radius and thickness / distance are all millimeters (mm).

[0125]

[0126] Table 5

[0127] In this embodiment, both the object-side and image-side surfaces of each of the first lens element E1 through the seventh lens element E7 are aspherical surfaces. Table 6 lists the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 of the aspherical surfaces S1 through S14 that can be used in Example 5.

[0128]

[0129]

[0130] Table 6

[0131] Example 6

[0132] The following is based on Figure 15 The optical imaging lens according to Example 6 of the present application is described.

[0133] like Figure 15 As shown, the optical imaging lens includes a lens barrel assembly, a spacer element group, and an optical lens group. The lens barrel assembly includes a first lens barrel and a second lens barrel. The optical lens group 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, arranged in sequence along the optical axis from the object side to the image side. A stop STO (not shown) can be disposed between the first lens E1 and the second lens E2. The first lens E1, the second lens E2, the third lens E3, the fourth lens E4, and the fifth lens E5 are disposed within the first lens barrel, and the sixth lens E6 and the seventh lens E7 are disposed within the second lens barrel.

[0134] The spacer element group may include a first spacer element P1, a second spacer element P2a, a second auxiliary spacer element P2b, a second auxiliary spacer element P2c, a third spacer element P3a, a third auxiliary spacer element P3b, a third auxiliary spacer element P3c, a fourth spacer element P4a, a fourth auxiliary spacer element P4b, a fourth auxiliary spacer element P4c, a sixth spacer element P6a, a sixth auxiliary spacer element P6b and a sixth auxiliary spacer element P6c.

[0135] The structure of the optical lens assembly of this embodiment is identical to that of Example 5. Specifically, the basic parameter table of the optical imaging lens of this embodiment is identical to Table 5, and the aspheric coefficient table is identical to Table 6. This embodiment differs from Example 5 in that the structure and dimensions of at least some of the elements in the lens barrel assembly and the spacer element assembly are different.

[0136] Figure 16 The axial chromatic aberration curve of the optical imaging lens of Example 5 or 6 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 17 The astigmatism curve of the optical imaging lens of Example 5 or 6 is shown, which represents the meridional field curvature and the sagittal field curvature. Figure 18 The distortion curve of the optical imaging lens of Example 5 or 6 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 19 The chromatic aberration curve of the optical imaging lens of Example 5 or 6 is shown, which represents the aberration of different image heights on the imaging surface after the light passes through the lens. Figures 16 to 19 It can be seen that the optical imaging lens of Example 5 or 6 can achieve good imaging quality.

[0137] Example 7

[0138] The following reference Figure 20 An optical imaging lens according to Example 7 of the present application is described.

[0139] like Figure 20 As shown, the optical imaging lens includes a lens barrel assembly, a spacer element group, and an optical lens group. The lens barrel assembly includes a first lens barrel and a second lens barrel. The optical lens group 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, arranged in sequence along the optical axis from the object side to the image side. A stop STO (not shown) can be disposed between the first lens E1 and the second lens E2. The first lens E1, the second lens E2, the third lens E3, the fourth lens E4, and the fifth lens E5 are disposed within the first lens barrel, and the sixth lens E6 and the seventh lens E7 are disposed within the second lens barrel.

[0140] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has negative optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being convex. The sixth lens E6 has negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being convex. The seventh lens E7 has negative optical power, with its object-side surface S13 being concave and its image-side surface S14 being concave. In this example, an optical element, such as a filter, may be further provided on the image side of the seventh lens E7. The optical element may have an object-side surface S15 (not shown) and an image-side surface S16 (not shown). Light from an object passes through the surfaces S1 to S16 in sequence and is finally imaged on an imaging surface S17 (not shown).

[0141] The spacer assembly may include a first spacer P1, a second spacer P2, a third spacer P3a, a third auxiliary spacer P3b, a third auxiliary spacer P3c, a fourth spacer P4, a sixth spacer P6a, a sixth auxiliary spacer P6b, and a sixth auxiliary spacer P6c. The spacers prevent excess light from entering the next lens during the imaging process, while also providing better support between the lens and the lens barrel, enhancing the structural stability of the optical imaging lens.

[0142] Table 7 shows the basic parameters of the optical imaging lens of Example 7, where the units of curvature radius and thickness / distance are all millimeters (mm).

[0143]

[0144]

[0145] Table 7

[0146] In this embodiment, both the object-side surface and the image-side surface of each of the first lens element E1 through the seventh lens element E7 are aspherical surfaces. Table 8 lists the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 of the aspherical surfaces S1 through S14 that can be used in Example 7.

[0147] Face number A4 A6 A8 A10 A12 A14 A16 S1 -1.8056E-01 -3.1750E-02 4.3785E-03 6.1143E-04 6.9688E-04 -4.7336E-04 4.0549E-05 S2 2.0060E-02 -5.8230E-02 1.9856E-02 -6.4725E-03 4.0086E-03 -2.6224E-03 1.1753E-03 S3 -2.0895E-01 3.5955E-03 4.4691E-03 -6.6779E-03 4.6114E-03 -3.1236E-03 1.5274E-03 S4 -4.3625E-01 5.6759E-02 -6.4140E-03 -1.3889E-03 1.2720E-03 -1.1393E-03 6.1484E-04 S5 1.0417E-02 -8.4219E-03 5.5905E-03 -1.1583E-03 -1.1992E-03 -3.4550E-05 1.8381E-04 S6 9.8200E-01 -2.2377E-01 4.8479E-02 -1.3100E-02 1.0037E-03 -1.0073E-04 7.8798E-04 S7 7.9985E-02 -5.0247E-02 2.7466E-02 -2.7364E-03 -3.8087E-03 2.5487E-03 6.0087E-04 S8 -1.8024E+00 9.8543E-02 -4.3176E-02 6.3159E-03 -1.0949E-02 3.5760E-03 -5.4106E-05 S9 -7.6172E-01 -1.4525E-02 3.7263E-03 2.0729E-03 -2.5735E-03 2.0497E-03 1.2882E-03 S10 -1.1958E-01 -2.8729E-02 7.6561E-03 2.0005E-03 1.3791E-03 1.1405E-03 1.0379E-03 S11 7.0676E-01 -5.5412E-02 2.4963E-03 -3.1158E-03 2.5395E-04 -7.3847E-05 1.0936E-04 S12 8.0807E-01 -3.9859E-02 7.6141E-04 -3.2888E-03 -5.0976E-04 1.1080E-04 9.9540E-05 S13 -1.1586E+00 3.1854E-01 -3.3394E-02 2.5863E-02 -8.9831E-03 2.5362E-03 -1.8325E-03 S14 -2.3326E+00 3.8689E-01 -1.3468E-01 4.9625E-02 -2.0494E-02 9.5427E-03 -4.3935E-03 Face number A18 A20 A22 A24 A26 A28 A30 S1 -1.0407E-04 1.1392E-05 -2.1690E-05 7.9282E-06 2.0782E-07 0.0000E+00 0.0000E+00 S2 -5.3805E-04 1.1029E-04 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 -7.1628E-04 1.8867E-04 -1.0094E-05 -2.3449E-06 0.0000E+00 0.0000E+00 0.0000E+00 S4 -3.5614E-04 8.8458E-05 1.7213E-05 -1.2514E-05 9.6262E-07 0.0000E+00 0.0000E+00 S5 -2.3742E-04 2.5153E-05 4.6991E-05 -2.5815E-05 0.0000E+00 0.0000E+00 0.0000E+00 S6 -9.4529E-04 2.8370E-04 6.7383E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S7 -8.6898E-04 8.1095E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S8 -4.3190E-04 -3.0717E-04 -1.4520E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S9 -1.2282E-04 -3.6985E-04 3.2408E-05 -4.3594E-05 9.7177E-06 8.0893E-08 0.0000E+00 S10 -2.1991E-04 -8.1378E-06 -7.2486E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S11 -2.1203E-04 1.0513E-04 6.1869E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S12 -2.6880E-05 1.2663E-05 4.8773E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S13 5.5463E-04 -2.6822E-04 8.9197E-05 -1.1815E-04 8.6043E-05 -2.8865E-05 1.0404E-06 S14 2.1153E-03 -1.0191E-03 4.2278E-04 -2.4606E-04 1.1053E-04 -6.5327E-05 4.4444E-05

[0148] Table 8

[0149] Example 8

[0150] The following is based on Figure 21 The optical imaging lens according to Example 8 of the present application is described.

[0151] like Figure 21 As shown, the optical imaging lens includes a lens barrel assembly, a spacer element group, and an optical lens group. The lens barrel assembly includes a first lens barrel and a second lens barrel. The optical lens group 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, arranged in sequence along the optical axis from the object side to the image side. A stop STO (not shown) can be disposed between the first lens E1 and the second lens E2. The first lens E1, the second lens E2, the third lens E3, the fourth lens E4, and the fifth lens E5 are disposed in the first lens barrel, and the sixth lens E6 and the seventh lens E7 are disposed in the second lens barrel P20.

[0152] The spacer element group may include a first spacer element P1, a second spacer element P2a, a second auxiliary spacer element P2b, a third spacer element P3a, a third auxiliary spacer element P3b, a third auxiliary spacer element P3c, a fourth spacer element P4, a sixth spacer element P6a, a sixth auxiliary spacer element P6b and a sixth auxiliary spacer element P6c.

[0153] The structure of the optical lens assembly of this embodiment is identical to that of Example 7. Specifically, the basic parameter table of the optical imaging lens of this embodiment is identical to Table 7, and the aspheric coefficient table is identical to Table 8. This embodiment differs from Example 7 in that the structure and dimensions of at least some of the elements in the lens barrel assembly and the spacer element assembly are different.

[0154] Figure 22 The axial chromatic aberration curve of the optical imaging lens of Example 7 or 8 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 23The astigmatism curve of the optical imaging lens of Example 7 or 8 is shown, which represents the meridional field curvature and the sagittal field curvature. Figure 24 The distortion curve of the optical imaging lens of Example 7 or 8 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 25 The chromatic aberration curve of the optical imaging lens of Example 7 or 8 is shown, which represents the aberration of different image heights on the imaging surface after the light passes through the lens. Figures 22 to 25 It can be seen that the optical imaging lens of Example 7 or 8 can achieve good imaging quality.

[0155] Table 9 gives the values ​​of the f1, f2, f3, f4, f5, f6, and f7 parameters of each embodiment in Examples 1-8.

[0156] Parameters / Example 1 2 3 4 5 6 7 8 f1(mm) 11.42 11.42 13.84 13.84 11.31 11.31 10.96 10.96 f2(mm) -9.45 -9.45 -10.64 -10.64 -9.70 -9.70 -8.90 -8.90 f3(mm) 5.87 5.87 6.15 6.15 6.09 6.09 5.70 5.70 f4(mm) -6.52 -6.52 -8.18 -8.18 -7.03 -7.03 -6.49 -6.49 f5(mm) 5.82 5.82 6.38 6.38 6.02 6.02 5.92 5.92 f6(mm) -24.16 -24.16 -27.02 -27.02 -26.89 -26.89 -24.77 -24.77 f7(mm) -8.08 -8.08 -7.97 -7.97 -8.01 -8.01 -7.91 -7.91

[0157] Table 9

[0158] Table 10 shows the values ​​of d1m, D1m, d2s, D2s, d6s, D6s, CP1, CP2, CP3, CP4, CP6, EP23, EP34, EP101, and EP206 parameters in each of Examples 1-8. Figure 1 Measured using the marking method shown.

[0159] Parameters / Example 1 2 3 4 5 6 7 8 d1m(mm) 5.448 6.212 5.342 5.340 5.344 5.342 5.342 5.341 D1m(mm) 6.786 6.677 7.500 7.420 7.504 7.500 7.400 7.500 d2s(mm) 5.432 5.372 5.345 5.234 5.245 5.245 5.345 5.719 D2s(mm) 6.986 6.986 7.400 7.300 7.402 7.400 7.300 7.104 d6s(mm) 6.056 6.924 6.250 6.838 6.090 6.080 6.070 6.069 D6s(mm) 8.986 10.286 8.800 9.142 8.800 7.238 9.000 8.800 CP1(mm) 0.022 0.338 0.020 0.022 0.022 0.022 0.022 0.022 CP2(mm) 0.022 0.020 0.022 0.020 0.022 0.022 0.022 0.375 CP3(mm) 0.022 0.018 0.020 0.022 0.022 0.022 0.022 0.022 CP4(mm) 0.022 0.020 0.018 0.022 0.022 0.020 0.022 0.020 CP6(mm) 0.022 0.020 0.018 0.020 0.022 0.020 0.022 0.020 EP12(mm) 1.221 0.996 1.057 0.950 0.957 0.958 1.378 1.003 EP23(mm) 0.597 0.599 0.498 0.607 0.738 0.740 0.418 0.440 EP34(mm) 0.978 1.030 0.916 0.918 1.047 1.046 0.913 0.912 EP101(mm) 1.003 0.862 1.089 1.090 1.089 1.088 1.189 1.189 EP206(mm) 1.420 2.094 1.422 1.944 1.320 1.322 1.420 1.419

[0160] Table 10

[0161] Table 11 shows the values ​​of the conditional expressions of each of Examples 1 to 8.

[0162]

[0163]

[0164] Table 11

[0165] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of application involved in this application is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the inventive concept. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An optical imaging lens, characterized in that: include: an optical lens group, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in order from the object side to the image side along the optical axis; a spacer element group, comprising a sixth spacer element disposed on the image-side surface of the sixth lens and in contact with the image-side surface of the sixth lens; as well as a lens barrel assembly, wherein the optical lens group and the spacer element group are placed in the lens barrel assembly; The optical imaging lens has seven lenses with optical power. The air gap T67 between the sixth lens and the seventh lens on the optical axis, the center thickness CT6 of the sixth lens on the optical axis, and the center thickness CT7 of the seventh lens on the optical axis satisfy the following conditions: 2.89≤T67 / (CT6+CT7≤4.12); The curvature radius R11 of the object side surface of the sixth lens, the curvature radius R12 of the image side surface of the sixth lens, the outer diameter D6s of the object side surface of the sixth spacer element, and the inner diameter d6s of the object side surface of the sixth spacer element satisfy: 0.65<(R12 / R11) / (D6s-d6s)<4.

95.

2. The optical imaging lens according to claim 1, wherein: The lens barrel assembly includes a first lens barrel and a second lens barrel. The first lens, the second lens, the third lens, the fourth lens and the fifth lens are placed in the first lens barrel, and the sixth lens and the seventh lens are placed in the second lens barrel.

3. The optical imaging lens according to claim 2, wherein: The distance EP206 between the object side end surface of the second lens barrel and the sixth spacer element along the optical axis, the maximum thickness CP6 of the sixth spacer element and the center thickness CT6 of the sixth lens on the optical axis meet the following conditions: 3.5 <EP206 / (CT6+CP6)<5.55。 4. The optical imaging lens according to claim 2, wherein: A distance EP206 between the object-side end surface of the second lens barrel and the sixth spacer element along the optical axis and an effective focal length f6 of the sixth lens satisfy the following: -20.37≤f6 / EP206≤-11.

54.

5. The optical imaging lens according to any one of claims 2 to 4, wherein: The spacer element group further includes a first spacer element disposed on the image side surface of the first lens and in contact with the image side surface of the first lens; The effective focal length f1 of the first lens, the distance EP101 between the object side end surface of the first lens barrel and the first spacer element along the optical axis, and the maximum thickness CP1 of the first spacer element satisfy the following conditions: 9.1 <f1 / (EP101+CP1)<12.5。 6. The optical imaging lens according to any one of claims 1 to 4, wherein: The spacer element group further includes a second spacer element disposed on the image side surface of the second lens and in contact with the image side surface of the second lens; The effective focal length f2 of the second lens, the spacing T23 between the second lens and the third lens on the optical axis, the maximum thickness CP2 of the second spacing element and the center thickness CT2 of the second lens on the optical axis satisfy the following conditions: -11.2 <f2 / (T23+CP2+CT2)<-6.15。 7. The optical imaging lens according to any one of claims 1 to 4, wherein: The spacer element group further includes a first spacer element disposed on and in contact with the image side surface of the first lens, and a second spacer element disposed on and in contact with the image side surface of the second lens; The distance EP12 between the first spacer element and the second spacer element along the optical axis and the spacing distance T12 between the first lens and the second lens on the optical axis satisfy: 5.2 <EP12 / T12<18.65。 8. The optical imaging lens according to any one of claims 1 to 4, wherein: The spacer element group further includes a third spacer element disposed on the image side surface of the third lens and in contact with the image side surface of the third lens, and a fourth spacer element disposed on the image side surface of the fourth lens and in contact with the image side surface of the fourth lens; The object-side surface of the third lens has a curvature radius R5 greater than zero, the image-side surface of the third lens has a curvature radius R6 less than zero, the object-side surface of the fourth lens has a curvature radius R7 greater than zero, and the image-side surface of the fourth lens has a curvature radius R8 less than zero. The center thickness CT3 of the third lens on the optical axis, the maximum thickness CP3 of the third spacer element, the center thickness CT4 of the fourth lens on the optical axis and the maximum thickness CP4 of the fourth spacer element satisfy: 1.6 <CT3×CP3 / (CT4×CP4)<2.95。 9. The optical imaging lens according to any one of claims 1 to 4, wherein: The spacer element group further includes a second spacer element disposed on and in contact with the image side surface of the second lens, and a third spacer element disposed on and in contact with the image side surface of the third lens; The distance EP23 between the second spacer element and the third spacer element along the optical axis and the spacing distance T34 between the third lens and the fourth lens on the optical axis satisfy: 1.9 <EP23 / T34<3.5。 10. The optical imaging lens according to any one of claims 1 to 4, wherein: The spacer element group further includes a first spacer element disposed on the image side surface of the first lens and in contact with the image side surface of the first lens; Among them, the curvature radius R2 of the image side surface of the first lens is greater than zero, the curvature radius R3 of the object side surface of the second lens is greater than zero, and the curvature radius R2 of the image side surface of the first lens, the outer diameter D1m of the image side surface of the first spacer element, the curvature radius R3 of the object side surface of the second lens, and the inner diameter d1m of the image side surface of the first spacer element satisfy: 2.2<(R2×D1m) / (R3×d1m)≤4.

44.

11. The optical imaging lens according to any one of claims 1 to 4, wherein: The spacer element group further includes a second spacer element disposed on the image side surface of the second lens and in contact with the image side surface of the second lens; The curvature radius R4 of the image side surface of the second lens is greater than zero, and the curvature radius R4 of the image side surface of the second lens, the refractive index N4 of the fourth lens, the outer diameter D2s of the object side surface of the second spacer element, and the inner diameter d2s of the object side surface of the second spacer element satisfy: 2.25 <R4×N4 / (D2s-d2s)<4.2。 12. The optical imaging lens according to any one of claims 1 to 4, wherein: The spacer element group further includes a third spacer element disposed on the image side surface of the third lens and in contact with the image side surface of the third lens, and a fourth spacer element disposed on the image side surface of the fourth lens and in contact with the image side surface of the fourth lens; The effective focal length f4 of the fourth lens and the distance EP34 between the third spacer element and the fourth spacer element along the optical axis satisfy the following: -8.93≤f4 / EP34≤-6.

33.

13. The optical imaging lens according to any one of claims 1 to 4, wherein: The first lens has positive optical power and its object side surface is convex; The second lens has negative optical power; The third lens has positive optical power; The fourth lens has negative optical power; The fifth lens has positive refractive power, and its object-side surface is convex, and its image-side surface is convex; The sixth lens has negative optical power, its object side surface is concave, and its image side surface is convex; The seventh lens element has negative optical power, and its object-side surface and image-side surface are concave.

Images