Optical imaging lens

Abstract

The invention discloses an optical imaging lens, the optical imaging lens comprises a lens barrel, a lens group and a plurality of spacing elements, the lens group and the spacing elements are arranged in the lens barrel, the lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens in sequence from an object side to an image side along an optical axis, a spacing distance is formed between any two adjacent lenses; the plurality of spacing elements comprise a sixth spacing element which is arranged on the image side of the sixth lens and is at least partially contacted with the image side surface of the sixth lens; wherein the central thickness CT6 of the sixth lens on the optical axis and the central thickness CT5 of the fifth lens on the optical axis meet the following conditions: 0.1 lt; cT6 / CT5 is less than 0.6; the effective focal length f6 of the sixth lens and the curvature radius R11 of the object side surface of the sixth lens meet the formula:-1lt; r1 / f6lt; R1 / f6lt; 1; and the inner diameter d6m of the image side surface of the sixth spacing element and the outer diameter D6m of the image side surface of the sixth spacing element satisfy: 0 lt; (D6m-d6m) / (D6m + d6m) lt; and 0.2 part.

Description

Technical Field

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

[0002] With the improvement of the technical level of electronic products, the requirements for optical imaging systems in intelligent devices are also getting higher and higher. As the core component of an optical imaging system, the imaging performance and functions of an optical lens are crucial. Intelligent devices usually require an optical lens to have a large field of view angle to obtain more comprehensive information. However, it is currently found that when the fifth lens and the sixth lens of a 6-piece ultra-wide-angle lens are outside the range of 0.1 < CT6 / CT5 < 0.6 and -1 < R11 / f6 < 1, poor-quality imaging light and excessive stray light are likely to be generated near the sixth lens, seriously affecting the performance of the optical imaging lens. Summary of the Invention

[0003] The first aspect of the present application provides such an optical imaging lens, which includes: a lens barrel, and a lens group and a plurality of spacer elements disposed in the lens barrel. Among them, the lens group sequentially includes, from the object side to the image side along the optical axis: a first lens with a negative optical power, a second lens with a positive optical power, a third lens with a positive optical power, a fourth lens with a negative optical power, a fifth lens with a positive optical power, and a sixth lens with a negative optical power. There is a spacing distance between any two adjacent lenses; and the plurality of spacer elements include: a sixth spacer element disposed on the image side of the sixth lens and at least partially in contact with the image side surface of the sixth lens; the image side surface of the first lens is concave; the object side surface of the second lens is convex, and the image side surface is concave; the object side surface of the third lens is convex, and the image side surface is convex; the object side surface of the fourth lens is convex, and the image side surface is concave; the image side surface of the fifth lens is convex; the image side surface of the sixth lens is concave; among them, the central thickness CT6 of the sixth lens on the optical axis and the central thickness CT5 of the fifth lens on the optical axis satisfy: 0.1 < CT6 / CT5 < 0.6; the effective focal length f6 of the sixth lens and the curvature radius R11 of the object side surface of the sixth lens satisfy: -1 < R11 / f6 < 1; and the inner diameter d6m of the image side surface of the sixth spacer element and the outer diameter D6m of the image side surface of the sixth spacer element satisfy: 0 < (D6m - d6m) / (D6m + d6m) < 0.2.

[0004] The second aspect of the present application provides an optical imaging lens, which includes: a lens barrel, a lens group and a plurality of spacer elements disposed in the lens barrel. Among them, the lens group sequentially includes, from the object side to the image side along the optical axis: a first lens with a negative optical power, a second lens with a positive optical power, a third lens with a positive optical power, a fourth lens with a negative optical power, a fifth lens with a positive optical power, and a sixth lens with a negative optical power. There is a spacing distance between any two adjacent lenses; the image side surface of the first lens is concave; the object side surface of the second lens is convex and the image side surface is concave; the object side surface of the third lens is convex and the image side surface is convex; the object side surface of the fourth lens is convex and the image side surface is concave; the image side surface of the fifth lens is convex; the image side surface of the sixth lens is concave; among them, the central thickness CT6 of the sixth lens on the optical axis satisfies 0 < CT6 < 0.53 mm; and the radius of curvature R12 of the image side surface of the sixth lens, the maximum height L of the lens barrel along the optical axis direction, the aperture number fno of the optical imaging lens, the outer diameter D0m of the image side end surface of the lens barrel and the inner diameter d0m of the image side end surface of the lens barrel satisfy: 0 mm < R12 × L × fno / (D0m - d0m) < 25 mm.

[0005] In one embodiment, the optical imaging lens satisfies: 2 < Ctmax / EPA < 4, where the first lens to the sixth lens respectively have central thicknesses on the optical axis, Ctmax is the maximum value of the central thickness, and EPA is the spacing distance along the optical axis of the two spacer elements closest to the lens with the largest central thickness.

[0006] In one embodiment, the maximum field of view angle fov of the optical imaging lens, the minimum inner diameter d0s of the front end portion of the lens barrel facing the object side and the outer diameter D0m of the image side end surface of the lens barrel satisfy: 0.3 < tan(fov / 2) × d0s / D0m < 1.5.

[0007] In one embodiment, the plurality of spacer elements include: a first spacer element disposed on the image side of the first lens and at least partially in contact with the image side surface of the first lens; a second spacer element disposed on the image side of the second lens and at least partially in contact with the image side surface of the second lens; and a third spacer element disposed on the image side of the third lens and at least partially in contact with the image side surface of the third lens; among them, the effective focal length f of the optical imaging lens, the distance EP12 along the optical axis between the image side surface of the first spacer element and the object side surface of the second spacer element, and the distance EP23 along the optical axis between the image side surface of the second spacer element and the object side surface of the third spacer element satisfy: 10 < f / EP12 × f / EP23 < 35.

[0008] In one embodiment, the radius of curvature R12 of the image side surface of the sixth lens, the maximum height L of the lens barrel along the optical axis direction, the f-number fno of the optical imaging lens, the outer diameter D0m of the image-side end surface of the lens barrel, and the inner diameter d0m of the image-side end surface of the lens barrel satisfy: 0 mm < R12 × L × fno / (D0m - d0m) < 25 mm.

[0009] In one embodiment, the plurality of spacer elements include: a second spacer element disposed on the image side of the second lens and at least partially in contact with the image side surface of the second lens; wherein, the inner diameter d2s of the object side surface of the second spacer element and the outer diameter D2s of the object side surface of the second spacer element satisfy: 5 mm 2 <π × (D2s^2 - d2s^2) < 60 mm 2 。

[0010] In one embodiment, the plurality of spacer elements include: a fourth spacer element disposed on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens; a fifth spacer element disposed on the image side of the fifth lens and at least partially in contact with the image side surface of the fifth lens; the central thickness CT4 of the fourth lens on the optical axis, the distance EP45 between the image side surface of the fourth spacer element and the object side surface of the fifth spacer element along the optical axis direction, and the air gap T45 between the fourth lens and the fifth lens on the optical axis satisfy: 2 < CT5 / CT4 + EP45 / T45 < 8.

[0011] In one embodiment, the plurality of spacer elements include: a fourth spacer element disposed on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens; a fifth spacer element disposed on the image side of the fifth lens and at least partially in contact with the image side surface of the fifth lens; wherein, the inner diameter d4s of the object side surface of the fourth spacer element, the inner diameter d5s of the object side surface of the fifth spacer element, the refractive index n4 of the fourth lens, and the refractive index n5 of the fifth lens satisfy: 25 < (n5 + n4) / (n5 - n4) × d5s / d4s < 70.

[0012] In one embodiment, the plurality of spacer elements further include: a third spacer element disposed on the image side of the third lens and at least partially in contact with the image side surface of the third lens; wherein, the inner diameter d3s of the object side surface of the third spacer element, the outer diameter D3s of the object side surface of the third spacer element, the radius of curvature R6 of the image side surface of the third lens, and the radius of curvature R7 of the object side surface of the fourth lens satisfy: 3 < D3s / d3s + |R7 / R6| < 30.

[0013] In one embodiment, the plurality of spacer elements further includes: a second spacer element disposed on the image side of the second lens and at least partially in contact with the image side surface of the second lens; wherein, the effective focal length f1 of the first lens, the inner diameter d2s of the object side surface of the second spacer element, and the minimum inner diameter d0s of the front end portion of the lens barrel facing the object side satisfy: 1 < d0s / d2s + |f2 / f1| < 10.

[0014] In one embodiment, the plurality of spacer elements further includes: a first spacer element disposed on the image side of the first lens and at least partially in contact with the image side surface of the first lens; a second spacer element disposed on the image side of the second lens and at least partially in contact with the image side surface of the second lens.

[0015] In one embodiment, the sign of the curvature radius R10 of the image side surface of the fifth lens is opposite to the sign of the curvature radius R12 of the image side surface of the sixth lens.

[0016] In one embodiment, among the first lens to the sixth lens, the fifth lens has the smallest effective focal length.

[0017] In one embodiment, the light absorption rate of the third spacer element in the visible light band is greater than 85%.

[0018] The fifth lens and the sixth lens of the optical imaging lens provided in the present application satisfy 0.1 < CT6 / CT5 < 0.6, -1 < R11 / f6 < 1, and 0 < (D6m - d6m) / (D6m + d6m) < 0.2. By reasonably restricting the center thickness of the fifth lens and the sixth lens, the curvature radius of the object side surface of the sixth lens, the effective focal length, and the inner and outer diameters of the image side surface of the sixth spacer element, the light rays with poor imaging quality and the excess stray light passing through the sixth lens can be effectively intercepted, ensuring better imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Other features, objects, and advantages of the present application will become more apparent by reading the detailed description of the non-limiting embodiments with reference to the following drawings:

[0020] Figure 1 Shows a schematic diagram of the structural arrangement and some parameters of an optical imaging lens according to the present application;

[0021] Figure 2A Shows a schematic diagram of the structure of the optical imaging lens according to Embodiment 1 of the present application;

[0022] Figure 2B Shows a schematic diagram of the structure of the optical imaging lens according to Embodiment 2 of the present application;

[0023] Figure 2C Shows a schematic diagram of the structure of the optical imaging lens according to Embodiment 3 of the present application;

[0024] Figures 3A to 3C respectively show the axial chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging lens according to Embodiment 1 to Embodiment 3 of the present application;

[0025] Figure 4A shows a schematic structural diagram of the optical imaging lens according to Embodiment 4 of the present application;

[0026] Figure 4B shows a schematic structural diagram of the optical imaging lens according to Embodiment 5 of the present application;

[0027] Figure 4C shows a schematic structural diagram of the optical imaging lens according to Embodiment 6 of the present application;

[0028] Figures 5A to 5C respectively show the axial chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging lens according to Embodiment 4 to Embodiment 6 of the present application;

[0029] Figure 6A shows a schematic structural diagram of the optical imaging lens according to Embodiment 7 of the present application;

[0030] Figure 6B shows a schematic structural diagram of the optical imaging lens according to Embodiment 8 of the present application;

[0031] Figure 6C shows a schematic structural diagram of the optical imaging lens according to Embodiment 9 of the present application;

[0032] Figures 7A to 7C respectively show the axial chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging lens according to Embodiment 7 to Embodiment 9 of the present application;

[0033] Figure 8 shows a schematic diagram of reducing stray light by a spacer element of an optical imaging lens according to the present application;

[0034] Figure 9 shows a schematic structural diagram of an optical imaging lens according to the present application; and

[0035] Figures 10A to 10C shows the stray light photos of three optical imaging lenses according to the present application. Detailed Embodiments

[0036] To better understand the present application, various aspects of the present application will be described in more 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 do not limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0037] It should be noted that in this specification, the expressions such as first, second, third, etc. are only used to distinguish one feature from another feature and do not represent any limitation on the features. Therefore, without departing from the teachings of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0038] In the drawings, for ease of illustration, the thickness, size, and shape of the lens have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are shown by way of example. That is, the spherical or aspherical shapes are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are only examples and are not drawn to an exact scale.

[0039] In this context, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens close to the object to be photographed is called the object side surface of the lens, and the surface of each lens close to the imaging surface is called the image side surface of the lens.

[0040] It should also be understood that the terms "comprise", "comprising", "have", "including" and / or "containing", 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. In addition, when an expression such as "at least one of..." appears after a list of listed features, it modifies the entire list of listed features rather than an individual element in the list. In addition, when describing the embodiments of the present application, the use of "may" means "one or more embodiments of the present application". And the term "exemplary" is intended to refer to an example or illustration.

[0041] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms (such as those defined in a common dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0042] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The following embodiments only express several implementation manners of the present application, and the descriptions thereof are relatively specific and detailed, but should not be construed as a limitation on the patent scope of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can be made, and these all belong to the protection scope of the present application. For example, the lens group, the lens barrel, and the spacer elements in the embodiments of the present application can be arbitrarily combined, and it is not limited that the lens group in one embodiment can only be combined with the lens barrel, the spacer elements, etc. in this embodiment.

[0043] The present application will be described in detail below with reference to the drawings and in combination with embodiments. Figure 1 The structural layout diagram of an optical imaging lens and the schematic diagram of some parameters according to the present application are shown. Those skilled in the art should understand that some parameters of the lenses that are often used in the art, such as the central thickness CT6 of the sixth lens on the optical axis, are not shown in Figure 1 it. Figure 1 Only some parameters of the lens barrel and the spacer elements of an optical imaging lens of the present application are exemplarily shown for better understanding of the present invention, as Figure 1 shown:

[0044] CP1, CP2, CP3, CP4, CP5, and CP6 are respectively the maximum thicknesses of the first spacer element, the second spacer element, the third spacer element, the fourth spacer element, the fifth spacer element, and the sixth spacer element along the optical axis direction;

[0045] L is the maximum height of the lens barrel along the optical axis direction;

[0046] EP01 is the distance between the minimum inner diameter at the front end of the lens barrel facing the object side and the first spacer element on the optical axis;

[0047] EP12 is the distance between the image side of the first spacer element and the object side of the second spacer element along the optical axis direction;

[0048] EP23 is the distance between the image side of the second spacer element and the object side of the third spacer element along the optical axis direction;

[0049] EP34 is the distance between the image side of the third spacer element and the object side of the fourth spacer element along the optical axis direction;

[0050] EP45 is the distance between the image side of the fourth spacer element and the object side of the fifth spacer element along the optical axis direction;

[0051] EP56 is the distance between the image side of the fifth spacer element and the object side of the sixth spacer element along the optical axis direction;

[0052] D0s is the outer diameter of the object-side end face of the lens barrel;

[0053] d0s is the minimum inner diameter of the front end portion of the lens barrel facing the object side;

[0054] D0m is the outer diameter of the image-side end face of the lens barrel;

[0055] d0m is the inner diameter of the image-side end face of the lens barrel;

[0056] D1s to D6s are the outer diameters of the object-side faces of the first to sixth spacer elements respectively;

[0057] d1s to d6s are the inner diameters of the object-side faces of the first to sixth spacer elements respectively;

[0058] D1m to D6m are the outer diameters of the image-side faces of the first to sixth spacer elements respectively; and

[0059] d1m to d6m are the inner diameters of the image-side faces of the first to sixth spacer elements respectively.

[0060] The optical imaging lens according to an exemplary embodiment of the present application includes a lens barrel, a lens group, and a plurality of spacer elements disposed in the lens barrel. The lens group includes: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in sequence from the object side to the image side along the optical axis. There may be a spacing distance between any two adjacent lenses among the first lens to the sixth lens.

[0061] In the exemplary embodiment, the plurality of spacer elements may include at least one of a first spacer element, a second spacer element, a third spacer element, a fourth spacer element, a fifth spacer element, and a sixth fixing element; wherein, the first spacer element is disposed on the image side of the first lens and at least partially contacts the image-side face of the first lens, the second spacer element is disposed on the image side of the second lens and at least partially contacts the image-side face of the second lens, the third spacer element is disposed on the image side of the third lens and at least partially contacts the image-side face of the third lens, the fourth spacer element is disposed on the image side of the fourth lens and at least partially contacts the image-side face of the fourth lens, the fifth spacer element is disposed on the image side of the fifth lens and at least partially contacts the image-side face of the fifth lens, the sixth fixing element is disposed on the image side of the sixth lens and at least partially contacts the image-side face of the sixth lens. Exemplarily, the first spacer element to the fifth spacer element may be spacer sheets or spacer rings, and the sixth fixing element may be a retaining ring. The spacer elements help the optical imaging lens intercept redundant refracted and reflected light paths, reducing the generation of stray light and ghost images. Adding an auxiliary support between the spacer elements and the lens barrel is beneficial to improving problems such as poor assembly stability and low performance yield due to large step differences between lenses.

[0062] The optical imaging lens of the present application can block non-imaging light paths, reduce stray light, and ensure the imaging effect of the lens by internally providing multiple spacer elements. Figure 8 FIG. shows a schematic diagram of a spacer element of an optical imaging lens according to the present application reducing stray light. A beam of light G is reflected multiple times between the fourth lens E4, the third spacer element P3, and the fourth spacer element P4, and is finally absorbed by the fourth spacer element P4 without entering the rear lens. The dotted line represents the path of this light G entering the rear lens when it is not absorbed by the fourth spacer element P4. It should be understood that, in order to make the structure and markings of the drawings clearer, Figure 8 only the fourth spacer element P4 eliminating stray light is taken as an example, and the remaining spacer elements also have the function of eliminating stray light, and the principle of eliminating stray light is the same, so it will not be elaborated.

[0063] It should be understood that the present application does not specifically limit the number of spacer elements. Any number of spacer elements can be included between any two lenses, and the entire optical imaging lens can also include any number of spacer elements. Exemplarily, as Figure 8 shown, spacer elements are provided between adjacent two lenses among the first lens E1 to the sixth lens E6, such as the first spacer element P1, the second spacer element P2, the third spacer element P3, the fourth spacer element P4. Two spacer elements are provided between the fifth lens E5 and the sixth lens E6, such as the fifth spacer element P5 and the fifth auxiliary spacer element P5b. A fixing element is provided on the image side of the sixth lens E6, such as the sixth fixing element P6. As Figure 9 shown, no spacer element is provided between the first lens E1 and the second lens E2, and between the second lens E2 and the third lens E3. Only spacer elements are provided between adjacent two lenses among the third lens E3 to the sixth lens E6, such as the third spacer element P3, the fourth spacer element P4, the fifth spacer element P5. A fixing element is provided on the image side of the sixth lens E6, such as the sixth fixing element P6.

[0064] In an exemplary embodiment, the central thickness CT6 of the sixth lens on the optical axis satisfies 0 < CT6 < 0.53 mm.

[0065] In an exemplary embodiment, the central thickness CT6 of the sixth lens on the optical axis and the central thickness CT5 of the fifth lens on the optical axis satisfy: 0.1 < CT6 / CT5 < 0.6.

[0066] In an exemplary embodiment, the effective focal length f6 of the sixth lens and the curvature radius R11 of the object side of the sixth lens satisfy: -1 < R11 / f6 < 1.

[0067] In an exemplary embodiment, the inner diameter d6m of the image side surface of the sixth spacer element and the outer diameter D6m of the image side surface of the sixth spacer element satisfy: 0 < (D6m - d6m) / (D6m + d6m) < 0.2.

[0068] In an exemplary embodiment, the optical imaging lens further includes a diaphragm. Exemplarily, the diaphragm can be disposed between the second lens and the third lens to limit the light beam and further improve the imaging quality of the eyepiece optical system. However, it should be noted that the position of the diaphragm disclosed herein is only an example and not a limitation; in an alternative embodiment, the diaphragm can also be disposed at other positions according to actual needs.

[0069] In an exemplary embodiment, the optical imaging lens according to the present application includes: a lens barrel, and a lens group and a plurality of spacer elements disposed in the lens barrel. Among them, the lens group sequentially includes, from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. There is a spacing distance between any two adjacent lenses; and the plurality of spacer elements include: a sixth spacer element disposed on the image side of the sixth lens and at least partially in contact with the image side surface of the sixth lens; wherein, the central thickness CT6 of the sixth lens on the optical axis and the central thickness CT5 of the fifth lens on the optical axis satisfy: 0.1 < CT6 / CT5 < 0.6; the effective focal length f6 of the sixth lens and the curvature radius R11 of the object side surface of the sixth lens satisfy: -1 < R11 / f6 < 1; and the inner diameter d6m of the image side surface of the sixth spacer element and the outer diameter D6m of the image side surface of the sixth spacer element satisfy: 0 < (D6m - d6m) / (D6m + d6m) < 0.2. Since when the fifth lens and the sixth lens are outside the ranges of 0.1 < CT6 / CT5 < 0.6 and -1 < R11 / f6 < 1, poor-quality imaging light and excessive stray light are likely to be generated near the sixth lens, seriously affecting the performance of the optical imaging lens. The present application controls the central thicknesses of the fifth lens and the sixth lens within the range of 0.1 < CT6 / CT5 < 0.6, and controls the effective focal length and the curvature radius of the object side surface of the sixth lens within the range of -1 < R11 / f6 < 1. At the same time, a sixth spacer element is also provided and satisfies 0 < (D6m - d6m) / (D6m + d6m) < 0.2, effectively intercepting the poor-quality imaging light and excessive stray light passing through the sixth lens and ensuring good imaging quality.

[0070] Exemplarily, Figure 10A A stray light photo in the case of CT6 / CT5 = 0.7 and R11 / f6 = -1.2 is shown, Figure 10A There is obvious stray light within the dashed boxes A and B, and it is the stray light near the sixth lens.

[0071] Exemplarily, Figure 10BThe stray light photos under the conditions of CT6 / CT5 = 0.1 and R11 / f6 = 1.3 are shown. Figure 10B There is obvious stray light within the dashed-line box C in the figure, and it is the stray light near the sixth lens.

[0072] Exemplarily, Figure 10C The stray light photos under the technical solution of the present application that satisfies 0.1 < CT6 / CT5 < 0.6, -1 < R11 / f6 < 1, and 0 < (D6m - d6m) / (D6m + d6m) < 0.2 are shown. Figure 10C The dashed-line box A' and the dashed-line box B' in the figure are respectively Figure 10A at the same positions as the dashed-line box A and the dashed-line box B in the figure, and there is basically no stray light within the dashed-line box A' and the dashed-line box B'; Figure 10C The dashed-line box C' in the figure is Figure 10B at the same position as the dashed-line box C in the figure, and the stray light within the dashed-line box C' is significantly less than that within the dashed-line box C. Thus, it can be seen that the technical solution of the present application can effectively reduce the stray light near the sixth lens and improve the imaging quality.

[0073] In an exemplary embodiment, the optical imaging lens according to the present application includes: a lens barrel, a lens group, and a plurality of spacer elements disposed within the lens barrel. Among them, the lens group sequentially includes, from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. Among them, there is a spacing distance between any two adjacent lenses; the central thickness CT6 of the sixth lens on the optical axis satisfies 0 < CT6 < 0.53 mm; and the radius of curvature R12 of the image side surface of the sixth lens, the maximum height L of the lens barrel along the optical axis direction, the aperture number fno of the optical imaging lens, the outer diameter D0m of the image-side end surface of the lens barrel, and the inner diameter d0m of the image-side end surface of the lens barrel satisfy: 0 mm < R12 × L × fno / (D0m - d0m) < 25 mm. When the central thickness of the sixth lens is less than 0.53, by reasonably matching the aperture number of the optical imaging lens, defining the radius of curvature of the image side surface of the sixth lens, the inner and outer diameters of the image side surface of the lens barrel, and the maximum height of the lens barrel, the forming processability of the sixth lens can be improved, the light rays with poor imaging quality and redundant stray light passing through the sixth lens can be effectively intercepted, good imaging quality can be ensured, and at the same time, the maximum outer shape of the lens barrel can be better controlled to ensure the assembly stability of the lens.

[0074] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 2 < Ctmax / EPA < 4, where the first lens to the sixth lens each have a central thickness on the optical axis, Ctmax is the maximum value of the central thickness, and EPA is the axial distance between the two spacer elements closest to the lens with the maximum central thickness. Through the above conditional expression, the maximum central thickness of the lens and the distance between the spacer elements on both sides of the lens with the maximum central thickness are reasonably restricted, which is equivalent to controlling the ratio of the central thickness to the edge thickness of the lens, effectively ensuring the formability and assembly stability of the lens, improving the overall assembly yield of the lens. Exemplarily, the overall assembly yield of the lens can be increased by 2%.

[0075] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 0.3 < tan(fov / 2) × d0s / D0m < 1.5, where fov is the maximum field of view angle of the optical imaging lens, d0s is the minimum inner diameter of the front end portion of the lens barrel facing the object side, and D0m is the outer diameter of the image side end face of the lens barrel. By reasonably restricting the maximum field of view angle of the optical imaging lens, the minimum inner diameter of the front end portion of the lens barrel facing the object side, and the outer diameter of the image side end face of the lens barrel, the field of view angle of the optical imaging lens can be effectively controlled, thereby controlling the light flux of the lens.

[0076] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 10 < f / EP12 × f / EP23 < 35, where f is the effective focal length of the optical imaging lens, EP12 is the axial distance between the image side surface of the first spacer element and the object side surface of the second spacer element, and EP23 is the axial distance between the image side surface of the second spacer element and the object side surface of the third spacer element. Satisfying 10 < f / EP12 × f / EP23 < 35 reasonably restricts the effective focal length of the optical imaging lens, and at the same time restricts the edge thicknesses of the second lens and the third lens along the optical axis direction by restricting EP12 and EP23, which can effectively balance the space distribution between the second lens and the third lens in the system and improve the assembly stability of the lens.

[0077] In an exemplary embodiment, the optical imaging lens according to the present application satisfies: 0 mm < R12 × L × fno / (D0m - d0m) < 25 mm, where R12 is the radius of curvature of the image side surface of the sixth lens, L is the maximum height of the lens barrel along the optical axis direction, fno is the aperture number of the optical imaging lens, D0m is the outer diameter of the image side end face of the lens barrel, and d0m is the inner diameter of the image side end face of the lens barrel. Through this conditional expression, the formability of the sixth lens can be improved, the maximum outer shape of the lens barrel can be better controlled, and the assembly stability of the lens can be ensured.

[0078] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 5 mm 2<π×(D2s^2 - d2s^2)<60mm 2 , where d2s is the inner diameter of the object side of the second spacer element, and D2s is the outer diameter of the object side of the second spacer element. By reasonably restricting the inner diameter and outer diameter of the object side of the second spacer element, the area of the object side of the second spacer element can be controlled, effectively reducing stray light.

[0079] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 2 < CT5 / CT4 + EP45 / T45 < 8, where CT4 is the central thickness of the fourth lens on the optical axis, EP45 is the distance between the image side of the fourth spacer element and the object side of the fifth spacer element along the optical axis, and T45 is the air gap between the fourth lens and the fifth lens on the optical axis. By reasonably restricting the central thickness of the fourth lens on the optical axis, the distance between the image side of the fourth spacer element and the object side of the fifth spacer element along the optical axis, and the air gap between the fourth lens and the fifth lens on the optical axis, the processability of the fourth lens and the fifth lens can be effectively ensured, avoiding molding problems such as welding marks, and reducing the influence of product forming defects on the lens strength.

[0080] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 25 < (n5 + n4) / (n5 - n4) × d5s / d4s < 70, where d4s is the inner diameter of the object side of the fourth spacer element, d5s is the inner diameter of the object side of the fifth spacer element, n4 is the refractive index of the fourth lens, and n5 is the refractive index of the fifth lens. By controlling the inner diameters of the object sides of the fourth spacer element and the fifth spacer element through the above conditional formula, on the premise of ensuring the illuminance of the lens, large-angle stray light rays can be effectively intercepted, the light entering the structural part of the fourth lens and the fifth lens can be reduced, and the imaging quality can be improved; in addition, the refractive indices of the fourth lens and the fifth lens can also be controlled through the above conditional formula to ensure that the light has a suitable exit angle.

[0081] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 3 < D3s / d3s + |R7 / R6| < 30, where d3s is the inner diameter of the object side of the third spacer element, D3s is the outer diameter of the object side of the third spacer element, R6 is the radius of curvature of the image side of the third lens, and R7 is the radius of curvature of the object side of the fourth lens. Satisfying 3 < D3s / d3s + |R7 / R6| < 30 and controlling the inner and outer diameters of the third spacer element, the radius of curvature of the image side of the third lens, and the radius of curvature of the fourth lens can effectively ensure that the outer diameters of the third lens and the fourth lens are within a reasonable range. At the same time, the optimal bearing position can be adopted for the fourth lens to improve the assembly stability; in addition, the size of the lens head can also be controlled.

[0082] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 1 < d0s / d2s + |f2 / f1| < 10, where f1 is the effective focal length of the first lens, d2s is the inner diameter of the object side surface of the second spacer element, and d0s is the minimum inner diameter of the front end portion of the lens barrel facing the object side. Exemplarily, the second spacer element may serve as a diaphragm and is disposed on the image side of the second lens, that is, the inner diameter of the image side surface of the second spacer element is the inner diameter of the diaphragm. By controlling the above conditional formula within a suitable range, an appropriate aperture number of the lens can be ensured, thereby controlling the amount of light entering the optical imaging lens, while intercepting excess stray light rays and improving the imaging quality.

[0083] In an exemplary embodiment, the signs of the curvature radius R10 of the image side surface of the fifth lens and the curvature radius R12 of the image side surface of the sixth lens are opposite. By reasonably restricting R10 and R12, the chromatic aberration of the light rays passing through the fifth lens and the sixth lens can be effectively reduced, and the imaging quality can be improved.

[0084] In an exemplary embodiment, among the first lens to the sixth lens, the fifth lens has the smallest effective focal length. By controlling the focal length of the fifth lens, the exit angle of the fifth lens can be controlled, effectively optimizing the convergence and trend of the light rays, and ensuring the imaging resolution of the optical imaging lens.

[0085] In an exemplary embodiment, the light absorption rate of the third spacer element in the visible light band is greater than 85%. By controlling the light absorption rate of the third spacer element in the visible light band, the reflected stray light can be effectively reduced, and the improvement effect of the large-angle stray light can be improved.

[0086] In an exemplary embodiment, the first lens may have a negative optical power, the second lens may have a positive optical power, the third lens may have a positive optical power, the fourth lens may have a negative optical power, the fifth lens may have a positive optical power, and the sixth lens may have a negative optical power.

[0087] In an exemplary embodiment, the image side surface of the first lens is concave; the object side surface of the second lens is convex, and the image side surface is concave; the object side surface of the third lens is convex, and the image side surface is convex; the object side surface of the fourth lens is convex, and the image side surface is concave; the image side surface of the fifth lens is convex; the image side surface of the sixth lens is concave.

[0088] In an embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the object-side surface of the first lens to the image-side surface of the sixth lens is an aspherical mirror surface. The characteristic of an aspherical lens is that the curvature continuously changes from the center of the lens to the periphery of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and astigmatism aberration. After using an aspherical lens, it is possible to eliminate the aberration that appears during imaging as much as possible, thereby improving the imaging quality. Optionally, the object-side surface and the image-side surface of all the lenses from the first lens to the sixth lens are aspherical mirror surfaces.

[0089] In an exemplary embodiment, the above optical imaging lens may further include a color filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0090] The optical imaging lens according to the above embodiment of the present application may employ multiple lenses, such as the six lenses described above. By reasonably distributing the optical power, surface type of each lens, and the arrangement of each spacer element, etc., the span of each gear when the lens cooperates with the lens barrel is relatively uniform, enhancing the ability of light convergence and improving the imaging quality of an ultra-thin, large image plane imaging lens. However, those skilled in the art should understand that without departing from the technical solution claimed in the present application, the number of lenses constituting the optical imaging lens can be changed to obtain the various results and advantages described in this specification. For example, although six lenses are described as an example in the embodiment, the optical imaging lens is not limited to including six lenses. If necessary, the optical imaging lens may further include other numbers of lenses.

[0091] The following further describes specific embodiments of the optical imaging lens applicable to the above embodiment with reference to the accompanying drawings. Specifically, refer to Figures 2A to 2C 、 Figures 3A to 3C to describe the optical imaging lens according to Embodiments 1 to 3 of the present application; refer to Figures 4A to 4C 、 Figures 5A to 5C to describe the optical imaging lens according to Embodiments 4 to 6 of the present application; refer to Figures 6A to 6C 、 Figures 7A to 7C to describe the optical imaging lens according to Embodiments 7 to 9 of the present application.

[0092] Example 1

[0093] Figure 2A FIG. shows a schematic structural diagram of the optical imaging lens according to Embodiment 1 of the present application. As Figure 2A shown, the optical imaging lens includes a lens barrel P0, a lens group, and a plurality of spacer elements.

[0094] As Figure 2AAs shown, the lens group of the optical imaging lens sequentially includes, from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6. The first lens E1 has an object side surface S1 and an image side surface S2. The second lens E2 has an object side surface S3 and an image side surface S4. The third lens E3 has an object side surface S5 and an image side surface S6. The fourth lens E4 has an object side surface S7 and an image side surface S8. The fifth lens E5 has an object side surface S9 and an image side surface S10. The sixth lens E6 has an object side surface S11 and an image side surface S12. Light from the object sequentially passes through each surface S1 to S12 and finally forms an image on the imaging surface (not shown).

[0095] Table 1 shows the basic parameter table of the lens group of the optical imaging lens in Embodiment 1, where the units of the radius of curvature, thickness, and effective focal length are all millimeters (mm).

[0096]

[0097] Table 1

[0098] In Embodiment 1, the object side surface and the image side surface of any one of the first lens E1 to the sixth lens E6 are both aspherical surfaces, and the surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0099]

[0100] where x is the sagitta of the distance from the vertex of the aspherical surface when the aspherical surface is at a position with a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 gives the high-order term coefficients A4, A6, A8, A 10 , A 12 , A 14 , A 16 , A 18 , and A 20 that can be used for each aspherical mirror surface S1 - S12 in Embodiment 1.

[0101] Plane number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 3.5765E-01 -6.4832E-01 1.0921E+00 -1.7134E+00 2.2679E+00 -2.3651E+00 1.7389E+00 -7.8057E-01 1.5879E-01 S2 1.8442E+00 -7.5080E+00 4.5602E+01 -2.5584E+02 1.1268E+03 -3.5036E+03 7.0471E+03 -8.2098E+03 4.1710E+03 S3 -5.2468E-03 -8.1442E-02 -2.0007E+00 1.6857E+01 -7.7335E+01 1.1323E+02 2.6256E+02 -1.1188E+03 1.0828E+03 S4 2.1760E-01 -7.1281E-01 -9.7430E-01 1.1119E+02 -1.7167E+03 1.2636E+04 -4.9878E+04 1.0190E+05 -8.4482E+04 S5 1.8819E-01 1.0245E+00 -3.4575E+01 4.6115E+02 -3.9545E+03 2.1597E+04 -7.2227E+04 1.3396E+05 -1.0508E+05 S6 -5.4698E-01 -7.9915E-01 2.2897E+01 -2.1390E+02 1.1747E+03 -4.0622E+03 8.6811E+03 -1.0432E+04 5.3843E+03 S7 -1.0050E+00 -1.6156E+00 2.3133E+01 -1.7244E+02 8.0613E+02 -2.5097E+03 4.9738E+03 -5.5792E+03 2.6869E+03 S8 -2.4312E-01 -1.2780E+00 9.3110E+00 -3.4530E+01 8.0828E+01 -1.2365E+02 1.2071E+02 -6.7902E+01 1.6692E+01 S9 1.8387E-01 -8.3957E-01 3.0076E+00 -6.7738E+00 9.7102E+00 -9.0809E+00 5.3892E+00 -1.8288E+00 2.6772E-01 S10 -7.4652E-02 5.6644E-01 -1.3477E+00 2.1734E+00 -2.2481E+00 1.4981E+00 -6.2971E-01 1.5242E-01 -1.5823E-02 S11 -1.7673E-01 -2.4617E-01 7.2519E-01 -9.7565E-01 8.4621E-01 -5.1841E-01 2.1108E-01 -4.8788E-02 4.7227E-03 S12 -3.6674E-01 4.1635E-01 -3.3997E-01 1.9541E-01 -7.9061E-02 2.1929E-02 -3.9485E-03 4.1359E-04 -1.9039E-05

[0102] Table 2

[0103] In this embodiment, the effective focal length f of the optical imaging lens is 1.79 mm, the maximum field of view FOV is 126.68°, and the f-number fno is 2.19.

[0104] As Figure 2AAs shown in the figure, the optical imaging lens further includes six spacer elements, namely a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, and a sixth fixed element P6. The first spacer element P1 is disposed on the image side of the first lens and at least partially contacts the image side surface of the first lens; the second spacer element P2 is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens. In this embodiment, the second spacer element P2 is also the aperture STO of the lens; the third spacer element P3 is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens; the fourth spacer element P4 is disposed on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens; the fifth spacer element P5 is disposed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; the sixth fixed element P6 is disposed on the image side surface of the sixth lens. Table 3 shows the basic parameter table of the spacer elements of the optical imaging lens. The unit of each parameter in Table 3 is millimeter (mm). The above spacer elements can block the entry of excessive external light, enable the lens and the lens barrel to bear against each other better, and enhance the structural stability of the optical imaging lens.

[0105] Parameter D6m d6m D0m d0s EP12 EP23 EP45 D2s Value 4.86 4.17 7.58 2.08 0.26 0.43 0.41 3.0 Parameter d2s D3s d3s d4s d5s EPA L d0m Value 0.93 3.3 1.35 2.18 2.98 0.41 4.1 5.3

[0106] Table 3

[0107] Example 2

[0108] Figure 2B Fig. shows a schematic structural diagram of an optical imaging lens according to Embodiment 2 of the present application. In this embodiment and the following embodiments, for the sake of simplicity, some descriptions similar to those in Embodiment 1 will be omitted.

[0109] As Figure 2B shown, the optical imaging lens includes a lens barrel P0, a lens group, and a plurality of spacer elements. The optical imaging lens further includes an aperture STO (not shown) disposed between the second lens and the third lens. The lens group of the optical imaging lens in Embodiment 2 is exactly the same as that of the optical imaging lens in Embodiment 1. The basic parameters are shown in detail in Tables 1 to 2. The effective focal length f, the maximum field of view FOV, and the f-number fno of the optical imaging lens in Embodiment 2 are the same as those of the optical imaging lens in Embodiment 1, and will not be described in detail.

[0110] As Figure 2BAs shown in the figure, the optical imaging lens further includes six spacer elements, namely a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, and a sixth fixing element P6. The first spacer element P1 is disposed on the image side of the first lens and at least partially contacts the image side surface of the first lens; the second spacer element P2 is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens. In this embodiment, the second spacer element P2 is also the aperture STO of the lens; the third spacer element P3 is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens; the fourth spacer element P4 is disposed on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens; the fifth spacer element P5 is disposed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; the sixth fixing element P6 is disposed on the image side surface of the sixth lens. Table 4 shows the basic parameter table of the spacer elements of the optical imaging lens. The unit of each parameter in Table 4 is millimeter (mm). The above spacer elements can block the entry of excessive external light, enable the lens and the lens barrel to bear against each other better, and enhance the structural stability of the optical imaging lens.

[0111] Parameter D6m d6m D0m d0s EP12 EP23 EP45 D2s Value 4.86 4.17 7.58 2.08 0.26 0.43 0.41 2.1 Parameter d2s D3s d3s d4s d5s EPA L d0m Value 0.93 2.08 1.35 2.18 2.98 0.41 4.1 5.3

[0112] Table 4

[0113] Example 3

[0114] Figure 2C shows a schematic structural diagram of an optical imaging lens according to Embodiment 3 of the present application. As Figure 2C shown, the optical imaging lens includes a lens barrel P0, a lens group, and a plurality of spacer elements. The optical imaging lens further includes an aperture STO (not shown) disposed between the second lens and the third lens. The lens group of the optical imaging lens in Embodiment 3 is exactly the same as the lens groups of the optical imaging lenses in Embodiment 1 and Embodiment 2. For the detailed basic parameters, please refer to Tables 1 to 2. The effective focal length f, the maximum field of view FOV, and the f-number fno of the optical imaging lens in Embodiment 3 are the same as those of the optical imaging lenses in Embodiment 1 and Embodiment 2, and will not be elaborated here.

[0115] As Figure 2CAs shown in the figure, the optical imaging lens further includes six spacer elements, namely a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, and a sixth fixing element P6. The first spacer element P1 is disposed on the image side of the first lens and is at least partially in contact with the image side surface of the first lens; the second spacer element P2 is disposed on the image side of the second lens and is at least partially in contact with the image side surface of the second lens. In this embodiment, the second spacer element P2 is also the aperture STO of the lens; the third spacer element P3 is disposed on the image side of the third lens and is at least partially in contact with the image side surface of the third lens; the fourth spacer element P4 is disposed on the image side of the fourth lens and is at least partially in contact with the image side surface of the fourth lens; the fifth spacer element P5 is disposed on the image side of the fifth lens and is at least partially in contact with the image side surface of the fifth lens; the sixth fixing element P6 is disposed on the image side surface of the sixth lens. Table 5 shows the basic parameter table of the spacer elements of the optical imaging lens, and the unit of each parameter in Table 5 is millimeter (mm). The above spacer elements can block the entry of excess external light, enable the lens and the lens barrel to be better supported, and enhance the structural stability of the optical imaging lens.

[0116] Parameter D6m d6m D0m d0s EP12 EP23 EP45 D2s Value 4.86 4.17 7.58 2.08 0.26 0.43 0.41 3 Parameter d2s D3s d3s d4s d5s EPA L d0m Value 0.93 3.3 1.35 2.29 2.93 0.41 4.1 5.3

[0117] Table 5

[0118] Figure 3A shows the axial chromatic aberration curves of the optical imaging lenses of Embodiments 1 to 3, which represent the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 3B shows the astigmatism curves of the optical imaging lenses of Embodiments 1 to 3, which represent the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 3C shows the distortion curves of the optical imaging lenses of Embodiments 1 to 3, which represent the distortion magnitude values corresponding to different field angles. According to Figures 3A to 3C it can be known that the optical imaging lenses given in Embodiments 1 to 3 can achieve good imaging quality.

[0119] Example 4

[0120] Figure 4A shows the structural schematic diagram of the optical imaging lens according to Embodiment 4 of the present application. As Figure 4A shown, the optical imaging lens includes a lens barrel P0, a lens group, and a plurality of spacer elements.

[0121] As Figure 4AAs shown, the lens group of the optical imaging lens sequentially includes, from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6. The first lens E1 has an object side surface S1 and an image side surface S2. The second lens E2 has an object side surface S3 and an image side surface S4. The third lens E3 has an object side surface S5 and an image side surface S6. The fourth lens E4 has an object side surface S7 and an image side surface S8. The fifth lens E5 has an object side surface S9 and an image side surface S10. The sixth lens E6 has an object side surface S11 and an image side surface S12. Light from the object sequentially passes through each surface S1 to S12 and finally forms an image on the imaging surface (not shown).

[0122] Table 6 shows the basic parameter table of the lens group of the optical imaging lens of Example 4, where the units of the radius of curvature, thickness, and effective focal length are all millimeters (mm). Table 7 shows the high-order term coefficients of the aspherical mirror surfaces that can be used in Example 4, where each aspherical surface type can be defined by the formula (1) given in the above Example 1.

[0123]

[0124]

[0125] Table 6

[0126] Plane number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 5.4211E-01 -8.4636E-01 1.0819E+00 -1.0001E+00 6.1420E-01 -2.1931E-01 3.4357E-02 / / S2 1.4581E+00 -3.3281E+00 1.0416E+01 -2.7088E+01 4.7629E+01 -4.7386E+01 1.7396E+01 / / S3 2.1943E-01 -1.3917E+00 4.6277E+00 -1.3598E+01 2.2740E+01 -1.8889E+01 6.4130E+00 / / S4 9.8373E-02 -4.7947E-01 4.2780E-01 2.1410E+00 -1.0396E+01 2.3869E+01 -8.9789E+00 / / S5 1.6358E-01 -5.4197E-01 2.1333E+00 -2.0352E+01 1.0123E+02 -2.6089E+02 2.2666E+02 3.1077E+02 -6.1542E+02 S6 -3.4592E-01 2.3647E-01 7.4438E+00 -8.1352E+01 4.6022E+02 -1.5822E+03 3.3390E+03 -3.9231E+03 1.9529E+03 S7 -9.1497E-01 9.9300E-01 -7.3957E+00 5.6954E+01 -2.8779E+02 8.8208E+02 -1.5594E+03 1.5200E+03 -6.6991E+02 S8 -3.2481E-01 -1.7357E-01 2.2880E+00 -7.9262E+00 1.9553E+01 -3.4855E+01 4.5069E+01 -3.4134E+01 1.0268E+01 S9 2.0690E-01 -5.0450E-01 1.0490E+00 -1.4291E+00 8.6262E-01 2.2584E-03 -1.2292E-01 / / S10 4.8313E-01 -8.1747E-01 1.2969E+00 -1.3359E+00 9.0424E-01 -4.0055E-01 9.1535E-02 / / S11 -4.4598E-02 -1.0124E+00 2.9052E+00 -5.5825E+00 7.3252E+00 -6.4550E+00 3.5795E+00 -1.1064E+00 1.4415E-01 S12 -2.5493E-01 2.0553E-01 -1.4998E-01 7.5633E-02 -2.1790E-02 6.1034E-04 1.9531E-03 -6.3009E-04 6.5412E-05

[0127] Table 7

[0128] In this embodiment, the effective focal length f of the optical imaging lens is 1.73 mm, the maximum field of view FOV is 120.94°, and the f-number fno is 2.19.

[0129] As Figure 4AAs shown in the figure, the optical imaging lens further includes six spacer elements, namely a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, and a sixth fixing element P6. The first spacer element P1 is disposed on the image side of the first lens and at least partially contacts the image side surface of the first lens; the second spacer element P2 is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens. In this embodiment, the second spacer element P2 is also the aperture STO of the lens; the third spacer element P3 is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens; the fourth spacer element P4 is disposed on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens; the fifth spacer element P5 is disposed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; the sixth fixing element P6 is disposed on the image side surface of the sixth lens. Table 8 shows the basic parameter table of the spacer elements of the optical imaging lens. The unit of each parameter in Table 8 is millimeter (mm). The above spacer elements can block the entry of excess external light, enable the lens and the lens barrel to be better supported, and enhance the structural stability of the optical imaging lens.

[0130] Parameter D6m d6m D0m d0s EP12 EP23 EP45 D2s Value 4.19 3.76 6.98 2.46 0.49 0.4 0.28 3.3 Parameter d2s D3s d3s d4s d5s EPA L d0m Value 0.99 3.4 1.33 1.85 2.52 0.28 3.7 4.64

[0131] Table 8

[0132] Example 5

[0133] Figure 4B Fig. shows a schematic structural diagram of an optical imaging lens according to Embodiment 5 of the present application. In this embodiment and the following embodiments, for the sake of simplicity, some descriptions similar to those in Embodiment 4 will be omitted.

[0134] As Figure 4B shown, the optical imaging lens includes a lens barrel P0, a lens group, and a plurality of spacer elements. The optical imaging lens further includes an aperture STO (not shown) disposed between the second lens and the third lens. The lens group of the optical imaging lens in Embodiment 5 is exactly the same as that of the optical imaging lens in Embodiment 4. The basic parameters are shown in detail in Tables 6 to 7. The effective focal length f, the maximum field of view FOV, and the f-number fno of the optical imaging lens in Embodiment 5 are the same as those of the optical imaging lens in Embodiment 4, and will not be described in detail.

[0135] As Figure 4BAs shown, the optical imaging lens further includes six spacer elements, namely a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, and a sixth fixing element P6. The first spacer element P1 is disposed on the image side of the first lens and at least partially contacts the image side surface of the first lens; the second spacer element P2 is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens. In this embodiment, the second spacer element P2 is also the aperture STO of the lens; the third spacer element P3 is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens; the fourth spacer element P4 is disposed on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens; the fifth spacer element P5 is disposed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; the sixth fixing element P6 is disposed on the image side surface of the sixth lens. Table 9 shows the basic parameter table of the spacer elements of the optical imaging lens. The unit of each parameter in Table 9 is millimeter (mm). The above spacer elements can block the entry of excess external light, enable the lens and the lens barrel to better bear against each other, and enhance the structural stability of the optical imaging lens.

[0136] Parameter D6m d6m D0m d0s EP12 EP23 EP45 D2s Value 4.19 3.76 6.98 2.46 0.49 0.4 0.28 3.3 Parameter d2s D3s d3s d4s d5s EPA L d0m Value 0.99 3.4 1.33 1.85 2.52 0.28 3.7 4.64

[0137] Table 9

[0138] Example 6

[0139] Figure 4C shows a schematic structural diagram of an optical imaging lens according to Embodiment 6 of the present application. As Figure 4C shown, the optical imaging lens includes a lens barrel P0, a lens group, and a plurality of spacer elements. The optical imaging lens further includes an aperture STO (not shown) disposed between the second lens and the third lens. The lens group of the optical imaging lens in Embodiment 6 is exactly the same as that of the optical imaging lenses in Embodiments 4 and 5. The basic parameters are shown in detail in Tables 6 to 7. The effective focal length f, the maximum field of view FOV, and the f-number fno of the optical imaging lens in Embodiment 6 are the same as those of the optical imaging lenses in Embodiments 4 and 5, and will not be elaborated here.

[0140] As Figure 4CAs shown, the optical imaging lens further includes six spacer elements, namely a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, and a sixth fixing element P6. The first spacer element P1 is disposed on the image side of the first lens and at least partially contacts the image side surface of the first lens; the second spacer element P2 is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens. In this embodiment, the second spacer element P2 is also the aperture STO of the lens; the third spacer element P3 is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens; the fourth spacer element P4 is disposed on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens; the fifth spacer element P5 is disposed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; the sixth fixing element P6 is disposed on the image side surface of the sixth lens. Table 10 shows the basic parameter table of the spacer elements of the optical imaging lens, and the unit of each parameter in Table 10 is millimeter (mm). The above spacer elements can block excess external light from entering, enable the lens and the lens barrel to bear against each other better, and enhance the structural stability of the optical imaging lens.

[0141] Parameter D6m d6m D0m d0s EP12 EP23 EP45 D2s Value 4.19 3.76 6.98 2.46 0.49 0.4 0.28 3.3 Parameter d2s D3s d3s d4s d5s EPA L d0m Value 0.99 2.4 1.33 1.85 2.52 0.28 3.7 4.64

[0142] Table 10

[0143] Figure 5A shows the axial chromatic aberration curves of the optical imaging lenses of Embodiments 4 to 6, which represent the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 5B shows the astigmatism curves of the optical imaging lenses of Embodiments 4 to 6, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 5C shows the distortion curves of the optical imaging lenses of Embodiments 4 to 6, which represent the distortion magnitude values corresponding to different field angles. According to Figures 5A to 5C it can be seen that the optical imaging lenses given in Embodiments 4 to 6 can achieve good imaging quality.

[0144] Example 7

[0145] Figure 6A shows a schematic structural diagram of the optical imaging lens according to Embodiment 7 of the present application. As Figure 6A shown, the optical imaging lens includes a lens barrel P0, a lens group, and a plurality of spacer elements.

[0146] As Figure 6AAs shown, the lens group of the optical imaging lens sequentially includes, from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6. The first lens E1 has an object side surface S1 and an image side surface S2. The second lens E2 has an object side surface S3 and an image side surface S4. The third lens E3 has an object side surface S5 and an image side surface S6. The fourth lens E4 has an object side surface S7 and an image side surface S8. The fifth lens E5 has an object side surface S9 and an image side surface S10. The sixth lens E6 has an object side surface S11 and an image side surface S12. Light from the object sequentially passes through each surface S1 to S12 and finally forms an image on the imaging surface (not shown).

[0147] Table 11 shows the basic parameter table of the lens group of the optical imaging lens of Embodiment 7, where the units of the radius of curvature, thickness, and effective focal length are all millimeters (mm). Table 12 shows the high-order term coefficients of the aspherical mirror surfaces that can be used in Embodiment 7, where each aspherical surface type can be defined by the formula (1) given in the above Embodiment 1.

[0148]

[0149]

[0150] Table 11

[0151] Plane number A4 A6 A8 A10 A12 A14 A16 S1 1.7317E-01 -1.2025E-01 6.4799E-02 -2.3775E-02 5.6881E-03 -8.0418E-04 5.2245E-05 S2 5.2862E-01 -7.2428E-01 1.5987E+00 -2.3206E+00 1.8528E+00 -4.0555E-01 -1.7751E-01 S3 -1.5392E-01 -3.5179E-01 8.4754E-01 -2.5710E+00 4.9153E+00 -4.1455E+00 1.2675E+00 S4 -1.2816E-01 -3.5595E-01 1.2978E+00 -4.4337E+00 1.2967E+01 -1.9273E+01 1.3149E+01 S5 -9.6554E-03 2.4071E-01 -3.0557E+00 1.4033E+01 -3.2350E+01 3.6479E+01 -1.4445E+01 S6 -3.7119E-01 8.9272E-01 -2.2835E+00 2.9456E+00 5.2515E-01 -6.7073E+00 6.3177E+00 S7 -7.2129E-01 1.2185E+00 -3.8472E+00 1.0413E+01 -1.9037E+01 1.9522E+01 -8.1828E+00 S8 -5.5946E-01 6.9752E-01 -8.1503E-01 8.7501E-01 -8.5463E-01 5.8976E-01 -1.7676E-01 S9 -2.6929E-02 3.3788E-02 3.0990E-02 -1.3025E-01 1.1639E-01 -3.8409E-02 3.6534E-03 S10 6.4867E-02 -4.0273E-02 7.4050E-02 -1.0308E-01 1.0335E-01 -5.4644E-02 1.1701E-02 S11 -1.4208E-02 -1.0715E-01 1.1106E-01 -1.1003E-01 7.7454E-02 -2.6274E-02 3.4021E-03 S12 -5.8797E-02 -2.4196E-02 3.1988E-02 -1.9301E-02 7.0209E-03 -1.3647E-03 1.0822E-04

[0152] Table 12

[0153] In this embodiment, the effective focal length f of the optical imaging lens is 1.96 mm, the maximum field of view FOV is 133.99°, and the f-number fno is 2.19.

[0154] As Figure 6AAs shown, the optical imaging lens further includes six spacer elements, namely a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, and a sixth fixing element P6. The first spacer element P1 is disposed on the image side of the first lens and at least partially contacts the image side surface of the first lens; the second spacer element P2 is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens. In this embodiment, the second spacer element P2 is also the aperture STO of the lens; the third spacer element P3 is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens; the fourth spacer element P4 is disposed on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens; the fifth spacer element P5 is disposed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; the sixth fixing element P6 is disposed on the image side surface of the sixth lens. Table 13 shows the basic parameter table of the spacer elements of the optical imaging lens. The unit of each parameter in Table 13 is millimeter (mm). The above spacer elements can block the entry of excess external light, enable the lens and the lens barrel to lean against each other better, and enhance the structural stability of the optical imaging lens.

[0155] Parameter D6m d6m D0m d0s EP12 EP23 EP45 D2s Value 4.53 3.86 8 3.49 0.49 0.43 0.23 4.37 Parameter d2s D3s d3s d4s d5s EPA L d0m Value 1.22 4.47 1.51 2.23 3.43 0.23 4.3 5.03

[0156] Table 13

[0157] Example 8

[0158] Figure 6B shows a schematic structural diagram of an optical imaging lens according to Embodiment 8 of the present application. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to those in Embodiment 7 will be omitted.

[0159] As Figure 6B shown, the optical imaging lens includes a lens barrel P0, a lens group, and a plurality of spacer elements. The optical imaging lens further includes an aperture STO (not shown) disposed between the second lens and the third lens. The lens group of the optical imaging lens in Embodiment 8 is exactly the same as that of the optical imaging lens in Embodiment 7. The basic parameters are shown in detail in Tables 11 to 12. The effective focal length f, the maximum field of view FOV, and the f-number fno of the optical imaging lens in Embodiment 8 are the same as those of the optical imaging lens in Embodiment 7, and will not be elaborated here.

[0160] As Figure 6BAs shown, the optical imaging lens further includes six spacer elements, namely a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, and a sixth fixing element P6. The first spacer element P1 is disposed on the image side of the first lens and at least partially contacts the image side surface of the first lens; the second spacer element P2 is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens. In this embodiment, the second spacer element P2 is also the aperture STO of the lens; the third spacer element P3 is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens; the fourth spacer element P4 is disposed on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens; the fifth spacer element P5 is disposed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; the sixth fixing element P6 is disposed on the image side surface of the sixth lens. Table 14 shows the basic parameter table of the spacer elements of the optical imaging lens, and the unit of each parameter in Table 14 is millimeter (mm). The above spacer elements can block excess external light from entering, enable the lens and the lens barrel to better bear against each other, and enhance the structural stability of the optical imaging lens.

[0161] Parameter D6m d6m ​ ​ ​ ​ ​ ​ ​ 4.53 3.86 8 3.49 0.49 0.4 0.23 4.37 ​ ​ ​ ​ ​ ​ ​ L ​ ​ 1.22 3.97 1.48 2.23 3.43 0.23 4.3 5.03

[0162] Table 14

[0163] ​

[0164] ​ shows a schematic structural diagram of an optical imaging lens according to Embodiment 9 of the present application. As ​ shown, the optical imaging lens includes a lens barrel P0, a lens group, and a plurality of spacer elements. The optical imaging lens further includes an aperture STO (not shown) disposed between the second lens and the third lens. The lens group of the optical imaging lens in Embodiment 9 is exactly the same as that of the optical imaging lenses in Embodiments 7 and 8. For the basic parameters, please refer to Tables 11 to 12. The effective focal length f, the maximum field of view FOV, and the f-number fno of the optical imaging lens in Embodiment 9 are the same as those of the optical imaging lenses in Embodiments 7 and 8, and will not be elaborated here.

[0165] As ​As shown, the optical imaging lens further includes six spacer elements, namely a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, and a sixth fixed element P6. The first spacer element P1 is disposed on the image side of the first lens and is at least partially in contact with the image side surface of the first lens; the second spacer element P2 is disposed on the image side of the second lens and is at least partially in contact with the image side surface of the second lens. In this embodiment, the second spacer element P2 is also the aperture STO of the lens; the third spacer element P3 is disposed on the image side of the third lens and is at least partially in contact with the image side surface of the third lens; the fourth spacer element P4 is disposed on the image side of the fourth lens and is at least partially in contact with the image side surface of the fourth lens; the fifth spacer element P5 is disposed on the image side of the fifth lens and is at least partially in contact with the image side surface of the fifth lens; the sixth fixed element P6 is disposed on the image side surface of the sixth lens. Table 15 shows the basic parameter table of the spacer elements of the optical imaging lens, and the unit of each parameter in Table 15 is millimeter (mm). The above spacer elements can block the entry of excessive external light, enable the lens and the lens barrel to be better supported, and enhance the structural stability of the optical imaging lens.

[0166] ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 4.53 3.86 8 3.49 0.5 0.43 0.23 4.37 ​ ​ ​ ​ ​ ​ ​ L ​ ​ 1.22 4.47 1.51 2.23 2.95 0.23 4.3 5.03

[0167] Table 15

[0168] ​ shows the axial chromatic aberration curves of the optical imaging lenses of Embodiments 7 to 9, which represent the deviation of the convergence points of light rays of different wavelengths after passing through the lens. ​ shows the astigmatism curves of the optical imaging lenses of Embodiments 7 to 9, which represent the curvature of the meridional image plane and the curvature of the sagittal image plane. ​ shows the distortion curves of the optical imaging lenses of Embodiments 7 to 9, which represent the distortion magnitude values corresponding to different field angles. According to ​ it can be seen that the optical imaging lenses given in Embodiments 7 to 9 can achieve good imaging quality.

[0169] In summary, the optical imaging lenses of Embodiments 1 to 9 satisfy the relationships shown in Table 16.

[0170] ​ 1 2 3 4 5 6 7 8 9 ​ 2.97 2.97 2.97 2.25 2.25 2.25 19.61 19.61 19.61 <![CDATA[π×(D2s^2-d2s^2)mm 2 > 25.56 11.14 25.56 31.13 31.13 31.13 55.32 55.32 55.32 ​ 6.51 6.51 6.51 4.69 4.69 4.69 6.04 6.04 6.04 ​ 31.62 31.62 29.60 33.86 33.86 33.86 65.37 65.37 56.22 ​ 25.89 24.99 25.89 6.32 6.32 5.57 4.37 4.09 4.37 ​ 4.53 4.53 4.53 5.41 5.41 5.41 8.96 8.96 8.96 ​ 2.64 2.64 2.64 2.80 2.80 2.80 3.74 3.74 3.74 ​ 0.48 0.48 0.48 0.41 0.41 0.41 0.27 0.27 0.27 ​ -0.63 -0.63 -0.63 -0.91 -0.91 -0.91 0.87 0.87 0.87 ​ 0.08 0.08 0.08 0.05 0.05 0.05 0.08 0.08 0.08 ​ 0.55 0.55 0.55 0.62 0.62 0.62 1.03 1.03 1.03 f / EP12 × f / EP23 28.54 28.54 28.54 15.32 15.32 15.32 18.30 19.68 17.94

[0171] Table 16

[0172] This application also provides an imaging device, and its electronic photosensitive element can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor element (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

[0173] The above description is only a preferred embodiment of the present application and an explanation of the technical principles applied. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by mutually replacing the above features with the technical features (but not limited to) disclosed in the present application that have similar functions.

Claims

1. An optical imaging lens, characterized in that, Comprising: A lens barrel and a lens group and a plurality of spacer elements disposed within the lens barrel, wherein The lens group sequentially includes, from the object side to the image side along the optical axis: a first lens with a negative optical power, a second lens with a positive optical power, a third lens with a positive optical power, a fourth lens with a negative optical power, a fifth lens with a positive optical power, and a sixth lens with a negative optical power, wherein there is a spacing distance between any two adjacent lenses; the image side surface of the first lens is concave; the object side surface of the second lens is convex and the image side surface is concave; the object side surface of the third lens is convex and the image side surface is convex; the object side surface of the fourth lens is convex and the image side surface is concave; the image side surface of the fifth lens is convex; the image side surface of the sixth lens is concave; and The plurality of spacer elements includes: a sixth spacer element disposed on the image side of the sixth lens and at least partially in contact with the image side surface of the sixth lens; wherein The central thickness CT6 of the sixth lens on the optical axis and the central thickness CT5 of the fifth lens on the optical axis satisfy: 0.1 < CT6 / CT5 < 0.6; The effective focal length f6 of the sixth lens and the radius of curvature R11 of the object side surface of the sixth lens satisfy: -1 < R11 / f6 < 1; and The inner diameter d6m of the image side surface of the sixth spacer element and the outer diameter D6m of the image side surface of the sixth spacer element satisfy: 0 < (D6m - d6m) / (D6m + d6m) < 0.

2.

2. The optical imaging lens according to claim 1, wherein The optical imaging lens satisfies: 2 < Ctmax / EPA < 4, wherein the first lens to the sixth lens respectively have central thicknesses on the optical axis, Ctmax is the maximum value of the central thicknesses, and EPA is the spacing distance in the optical axis direction between the two spacer elements closest to the lens with the maximum central thickness.

3. The optical imaging lens according to claim 1, wherein, The maximum field of view fov of the optical imaging lens, the minimum inner diameter d0s of the front end portion of the lens barrel facing the object side, and the outer diameter D0m of the image side end surface of the lens barrel satisfy: 0.3 < tan(fov / 2) × d0s / D0m < 1.

5.

4. The optical imaging lens according to claim 1, wherein, The plurality of spacer elements includes: A first spacer element disposed on the image side of the first lens and at least partially in contact with the image side surface of the first lens; A second spacer element disposed on the image side of the second lens and at least partially in contact with the image side surface of the second lens; and A third spacer element disposed on the image side of the third lens and at least partially in contact with the image side surface of the third lens; wherein The effective focal length f of the optical imaging lens, the distance EP12 in the optical axis direction between the image side surface of the first spacer element and the object side surface of the second spacer element, and the distance EP23 in the optical axis direction between the image side surface of the second spacer element and the object side surface of the third spacer element satisfy: 10 < f / EP12 × f / EP23 < 35.

5. The optical imaging lens according to claim 1, wherein The radius of curvature R12 of the image side surface of the sixth lens, the maximum height L of the lens barrel along the optical axis direction, the f-number fno of the optical imaging lens, the outer diameter D0m of the image-side end surface of the lens barrel, and the inner diameter d0m of the image-side end surface of the lens barrel satisfy: 0mm < R12×L×fno / (D0m - d0m) < 25mm.

6. The optical imaging lens according to claim 1, wherein The plurality of spacer elements include: A second spacer element, disposed on the image side of the second lens and at least partially in contact with the image side surface of the second lens; wherein, The inner diameter d2s of the object side surface of the second spacer element and the outer diameter D2s of the object side surface of the second spacer element satisfy: 5mm 2 <π×(D2s^2 - d2s^2) < 60mm 2 .

7. The optical imaging lens according to claim 1, wherein The plurality of spacer elements include: A fourth spacer element, disposed on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens; A fifth spacer element, disposed on the image side of the fifth lens and at least partially in contact with the image side surface of the fifth lens; The central thickness CT4 of the fourth lens on the optical axis, the distance EP45 between the image side surface of the fourth spacer element and the object side surface of the fifth spacer element along the optical axis direction, and the air gap T45 between the fourth lens and the fifth lens on the optical axis satisfy: 2 < CT5 / CT4 + EP45 / T45 < 8.

8. The optical imaging lens according to claim 1, wherein The plurality of spacer elements include: A fourth spacer element, disposed on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens; A fifth spacer element, disposed on the image side of the fifth lens and at least partially in contact with the image side surface of the fifth lens; wherein, The inner diameter d4s of the object side surface of the fourth spacer element, the inner diameter d5s of the object side surface of the fifth spacer element, the refractive index n4 of the fourth lens, and the refractive index n5 of the fifth lens satisfy: 25 < (n5 + n4) / (n5 - n4)×d5s / d4s < 70.

9. The optical imaging lens according to claim 1, wherein The plurality of spacer elements further include: A third spacer element, disposed on the image side of the third lens and at least partially in contact with the image side surface of the third lens; wherein, The inner diameter d3s of the object side surface of the third spacer element, the outer diameter D3s of the object side surface of the third spacer element, the radius of curvature R6 of the image side surface of the third lens, and the radius of curvature R7 of the object side surface of the fourth lens satisfy: 3 < D3s / d3s + |R7 / R6| < 30.

10. An optical imaging lens, characterized in that, Comprising: A lens barrel and a lens group and a plurality of spacer elements disposed in the lens barrel, wherein, The lens group sequentially includes, from the object side to the image side along the optical axis: a first lens with negative optical power, a second lens with positive optical power, a third lens with positive optical power, a fourth lens with negative optical power, a fifth lens with positive optical power, and a sixth lens with negative optical power, wherein there is a spacing distance between any two adjacent lenses; the image side surface of the first lens is concave; the object side surface of the second lens is convex and the image side surface is concave; the object side surface of the third lens is convex and the image side surface is convex; the object side surface of the fourth lens is convex and the image side surface is concave; the image side surface of the fifth lens is convex; the image side surface of the sixth lens is concave; The central thickness 0 < CT6 < 0.53mm of the sixth lens on the optical axis; and The radius of curvature R12 of the image side of the sixth lens, the maximum height L of the lens barrel along the optical axis direction, the aperture number fno of the optical imaging lens, the outer diameter D0m of the image-side end face of the lens barrel and the inner diameter d0m of the image-side end face of the lens barrel satisfy: 0 mm < R12 × L × fno / (D0m - d0m) < 25 mm.

Images