Optical imaging lens

Abstract

The utility model 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] This application relates to the field of optical elements, and more particularly, 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 Utility Model

[0003] In a first aspect of this application, there is provided 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, where 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; where 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, and 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 with a negative focal power, a second lens with a positive focal power, a third lens with a positive focal power, a fourth lens with a negative focal power, a fifth lens with a positive focal power, and a sixth lens with a negative focal 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 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 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; 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 curvature radius R12 of the image side surface of the sixth lens, the maximum height L of the lens barrel along the optical axis, 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)<25mm。

[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 an inner diameter d2s of the object side surface of the second spacer element and an outer diameter D2s of the object side surface of the second spacer element satisfy: 5 mm 2 <π×(D2s^2-d2s^2)<60mm 2 .

[0010] In one embodiment, the plurality of spacer elements include: a fourth spacer element, which is disposed on the image side of the fourth lens and is in at least partial contact with the image side surface of the fourth lens; a fifth spacer element, which is disposed on the image side of the fifth lens and is in at least partial contact with the image side surface of the fifth lens; a center thickness CT4 of the fourth lens on the optical axis, a 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, and an air spacing 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 an inner diameter d4s of the object side surface of the fourth spacer element, an inner diameter d5s of the object side surface of the fifth spacer element, a refractive index n4 of the fourth lens, and a 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, which is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens; wherein an inner diameter d3s of the object side surface of the third spacer element, an outer diameter D3s of the object side surface of the third spacer element, a curvature radius R6 of the image side surface of the third lens, and a curvature radius R7 of the object side surface of the fourth lens satisfy: <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 this 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, it is possible to effectively intercept the light with poor imaging quality and excess stray light passing through the sixth lens, and ensure good imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Other features, objects, and advantages of this 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 structural layout diagram of an optical imaging lens and a schematic diagram of some parameters according to this application;

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

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

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

[0024] FIG. 3A to FIG. 3C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the optical imaging lens according to Embodiment 1 to Embodiment 3 of the present application are respectively shown;

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

[0026] Figure 4B A schematic structural diagram of an optical imaging lens according to Embodiment 5 of the present application is shown;

[0027] Figure 4C A schematic structural diagram of an optical imaging lens according to Embodiment 6 of the present application is shown;

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

[0029] Fig. 6A A schematic structural diagram of an optical imaging lens according to Embodiment 7 of the present application is shown;

[0030] Figure 6B A schematic structural diagram of an optical imaging lens according to Embodiment 8 of the present application is shown;

[0031] Figure 6C A schematic structural diagram of an optical imaging lens according to Embodiment 9 of the present application is shown;

[0032] FIG. 7A to FIG. 7C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the optical imaging lens according to Embodiment 7 to Embodiment 9 of the present application are respectively shown;

[0033] Figure 8 A schematic diagram showing a spacer element of an optical imaging lens according to the present application to reduce stray light;

[0034] Fig. 9 A schematic diagram of the structure of an optical imaging lens according to the present application is shown; and

[0035] FIG. 10A to FIG. 10C The figures show stray light photos of three optical imaging lenses according to the present application. DETAILED DESCRIPTION

[0036] In order to better understand the present application, a more detailed description will be made of various aspects of the present application 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. 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 of 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 teaching 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, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0039] In this article, 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 is called the object side of the lens, and the surface of each lens close to the imaging plane is called the image side of the lens.

[0040] It should also be understood that the terms "comprises", "including", "having", "includes" and / or "comprising", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "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 terms and scientific terms) used in this article have the same meaning as those commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0042] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The following embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. For example, the lens groups, lens barrels, and spacer elements in the embodiments of the present application can be combined arbitrarily, and are not limited to the lens groups in one embodiment being only combined with the lens barrels, spacer elements, etc. of the embodiment.

[0043] The present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments. Figure 1 The structure arrangement diagram of an optical imaging lens according to the present application and a schematic diagram of some parameters are shown. Those skilled in the art should understand that some parameters of lenses commonly used in the art, such as the center thickness CT6 of the sixth lens on the optical axis, are not included in the figure. Figure 1 It is shown in Figure 1 Only some parameters of the lens barrel and the spacer element of an optical imaging lens of the present application are exemplified to facilitate a better understanding of the present invention. Figure 1 As 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;

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

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

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

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

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

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

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

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

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

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

[0056] D1s to D6s are outer diameters of the object side surfaces of the first to sixth spacing elements, respectively;

[0057] d1s to d6s are inner diameters of the object side surfaces of the first to sixth spacing elements, respectively;

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

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

[0060] The optical imaging lens according to the exemplary embodiment of the present application includes a lens barrel, a lens group and a plurality of spacing elements arranged 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. Any two adjacent lenses from the first lens to the sixth lens may have a spacing distance between them.

[0061] In an 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 fixed element; wherein the first spacer element is placed 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 is placed on the image side of the second lens and at least partially contacts the image side surface of the second lens, the third spacer element is placed 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 is placed 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 is placed 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 is placed on the image side of the sixth lens and at least partially contacts the image side surface of the sixth lens, and exemplarily, the first to fifth spacer elements may be spacers or spacers, and the sixth fixed element may be a pressure ring. The spacer element helps the optical imaging lens to intercept excess refractive and reflective light paths and reduce the generation of stray light and ghosting. Adding auxiliary support between the spacer element and the lens barrel is conducive to improving the problems of poor assembly stability and low performance yield caused by 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 having multiple built-in spacer elements. Figure 8 A schematic diagram of reducing stray light by using a spacing element of an optical imaging lens according to the present application is shown, a beam of light G is reflected multiple times between the fourth lens E4, the third spacing element P3 and the fourth spacing element P4, and is finally absorbed by the fourth spacing element P4 without entering the rear lens, and the dotted line represents the path of the light G entering the rear lens when it is not absorbed by the fourth spacing element P4. It should be understood that in order to make the structure and annotation of the drawings clearer, Figure 8 In the figure, only the fourth spacing element P4 is used as an example to eliminate stray light, and the remaining spacing elements also have the function of eliminating stray light, and the principle of eliminating stray light is the same, which will not be repeated.

[0063] It should be understood that the present application does not specifically limit the number of spacer elements, and any number of spacer elements may be included between any two lenses, and the entire optical imaging lens may also include any number of spacer elements. Figure 8 As shown, a spacer element is disposed between each adjacent lens from the first lens E1 to the sixth lens E6, such as a first spacer element P1, a second spacer element P2, a third spacer element P3, and a fourth spacer element P4; two spacers are disposed between the fifth lens E5 and the sixth lens E6, such as a fifth spacer element P5 and a fifth auxiliary spacer element P5b; and a fixed element, such as a sixth fixed element P6, is disposed on the image side surface of the sixth lens E6. Fig. 9 As 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. Spacer elements are provided only between two adjacent lenses from the third lens E3 to the sixth lens E6, such as the third spacer element P3, the fourth spacer element P4, and the fifth spacer element P5. A fixed element, such as the sixth fixed element P6, is provided on the image side surface of the sixth lens E6.

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

[0065] In an exemplary embodiment, the center thickness CT6 of the sixth lens on the optical axis and the center 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 surface of the sixth lens satisfy: <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. In the present application, by controlling the central thicknesses of the fifth lens and the sixth lens within the range of 0.1 < CT6 / CT5 < 0.6, and controlling 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, and at the same time setting the sixth spacer element and satisfying 0 < (D6m - d6m) / (D6m + d6m) < 0.2, the poor-quality imaging light and excessive stray light passing through the sixth lens are effectively intercepted, ensuring good imaging quality.

[0070] Exemplarily, Fig. 10A A photo of stray light in the case of CT6 / CT5 = 0.7 and R11 / f6 = -1.2 is shown, Fig. 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, Fig. 10BThe stray light photos under the conditions of CT6 / CT5 = 0.1 and R11 / f6 = 1.3 are shown. Fig. 10B There is obvious stray light within the dashed box C in the figure, and it is the stray light near the sixth lens.

[0072] Exemplarily, Fig. 10C The stray light photos under the technical solution of the present application that satisfy 0.1 < CT6 / CT5 < 0.6, -1 < R11 / f6 < 1, and 0 < (D6m - d6m) / (D6m + d6m) < 0.2 are shown. Fig. 10C The dashed box A' and the dashed box B' in the figure are respectively Fig. 10A at the same positions as the dashed box A and the dashed box B in the figure, and there is basically no stray light within the dashed box A' and the dashed box B'; Fig. 10C The dashed box C' in the figure is Fig. 10B at the same position as the dashed box C in the figure, and the stray light within the dashed box C' is significantly less than that within the dashed 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 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. When the central thickness of the sixth lens is less than 0.53, by reasonably matching the f-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 distance between the two spacer elements closest to the lens with the maximum central thickness along the optical axis direction. Through the above conditional formula, 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 molding processability 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 distance between the image side surface of the first spacer element and the object side surface of the second spacer element along the optical axis direction, and EP23 is the distance between the image side surface of the second spacer element and the object side surface of the third spacer element along the optical axis direction. 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 thickness 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 formula, the forming processability 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) < 60 mm 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, and stray light can be effectively reduced.

[0079] In an exemplary embodiment, the optical imaging lens according to the present application can 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 direction, 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 direction, and the air gap between the fourth lens and the fifth lens on the optical axis, the processing formability of the fourth lens and the fifth lens can be effectively ensured, the formation problems such as welding marks can be avoided, and the influence of product forming defects on the lens strength can be reduced.

[0080] In an exemplary embodiment, the optical imaging lens according to the present application can 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 can 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 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. 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 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 mirror surfaces from the object side of the first lens to the image side of the sixth lens is an aspherical mirror surface. The characteristic of an aspherical lens is that the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting an aspherical lens, the aberration occurring during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, the object side and image side of all lenses from the first lens to the sixth lens are aspherical mirror surfaces.

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

[0090] The optical imaging lens according to the above-mentioned embodiment of the present application may use multiple lenses, such as the six lenses mentioned above. By reasonably allocating the focal length, surface shape and arrangement of each spacing element of each lens, the span of each gear of the lens and the lens barrel is made more uniform, the ability of light convergence is enhanced, and the imaging quality of the ultra-thin, large image surface imaging lens is improved. However, those skilled in the art should understand that without departing from the technical solution claimed for protection in this 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 also include other numbers of lenses.

[0091] The following further describes specific embodiments of the optical imaging lens applicable to the above-mentioned embodiments with reference to the accompanying drawings. FIG. 2A to FIG. 2C , FIG. 3A to FIG. 3C Describe the optical imaging lens according to Embodiments 1 to 3 of the present application; refer to FIG. 4A to FIG. 4C , FIG. 5A to FIG. 5C Describe the optical imaging lens according to Embodiments 4 to 6 of the present application; refer to FIG. 6A to FIG. 6C , FIG. 7A to FIG. 7C Optical imaging lenses according to Embodiments 7 to 9 of the present application are described.

[0092] Example 1

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

[0094] like Figure 2AAs shown, the lens group of the optical imaging lens 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 passes through each surface S1 to S12 in sequence and is finally imaged on an imaging surface (not shown).

[0095] Table 1 shows the basic parameters of the lens group of the optical imaging lens of Example 1, wherein the units of the curvature radius, thickness and effective focal length are all millimeters (mm).

[0096]

[0097] Table 1

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

[0099]

[0100] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is 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 curvature radius R in Table 1 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0101] Face 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 aperture number fno is 2.19.

[0104] like Figure 2AAs shown, the optical imaging lens further includes 6 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 placed 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 placed 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 placed 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 placed 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 placed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; and the sixth fixed element P6 is placed on the image side surface of the sixth lens. Table 3 shows a basic parameter table of the spacer elements of the optical imaging lens, and the units of each parameter in Table 3 are millimeters (mm). The above-mentioned spacer elements can block the entry of excess external light, so that the lens and the lens barrel can be better supported, and the structural stability of the optical imaging lens is enhanced.

[0105] parameter D6m d6m D0m d0s EP12 EP23 EP45 D2s Numeric 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 Numeric 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 The structure diagram of the optical imaging lens according to Embodiment 2 of the present application is shown. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to Embodiment 1 will be omitted.

[0109] like Figure 2B As shown, the optical imaging lens comprises a lens barrel P0, a lens group and a plurality of spacer elements. The optical imaging lens further comprises a stop STO (not shown) disposed between the second lens and the third lens. The lens group of the optical imaging lens of Example 2 is exactly the same as the lens group of the optical imaging lens of Example 1, and its basic parameters are detailed in Tables 1 and 2. The effective focal length f, maximum field angle FOV and aperture number fno of the optical imaging lens of Example 2 are the same as those of the optical imaging lens of Example 1, and are not described in detail.

[0110] like Figure 2BAs shown, the optical imaging lens further includes 6 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 placed 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 placed 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 placed 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 placed 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 placed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; and the sixth fixed element P6 is placed on the image side surface of the sixth lens. Table 4 shows a basic parameter table of the spacer elements of the optical imaging lens, and the units of each parameter in Table 4 are millimeters (mm). The above-mentioned spacer elements can block the entry of excess external light, so that the lens and the lens barrel can be better supported, and the structural stability of the optical imaging lens is enhanced.

[0111] parameter D6m d6m D0m d0s EP12 EP23 EP45 D2s Numeric 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 Numeric 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 FIG. 2 shows a schematic structural diagram of an optical imaging lens according to Embodiment 3 of the present application. Figure 2C As shown, the optical imaging lens comprises a lens barrel P0, a lens group and a plurality of spacer elements. The optical imaging lens further comprises an aperture STO (not shown) disposed between the second lens and the third lens. The lens group of the optical imaging lens of Example 3 is exactly the same as the lens group of the optical imaging lens of Example 1 and Example 2, and its basic parameters are detailed in Tables 1 and 2. The effective focal length f, maximum field angle FOV and aperture number fno of the optical imaging lens of Example 3 are the same as those of the optical imaging lenses of Example 1 and Example 2, and are not described in detail.

[0115] like Figure 2CAs shown, the optical imaging lens further includes 6 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 placed 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 placed 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 placed 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 placed 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 placed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; and the sixth fixed element P6 is placed on the image side surface of the sixth lens. Table 5 shows a basic parameter table of the spacer elements of the optical imaging lens, and the units of each parameter in Table 5 are millimeters (mm). The above-mentioned spacer elements can block the entry of excess external light, so that the lens and the lens barrel can be better supported, and the structural stability of the optical imaging lens is enhanced.

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

[0117] Table 5

[0118] Figure 3A The axial chromatic aberration curves of the optical imaging lenses of Examples 1 to 3 are shown, which indicate the deviation of light rays of different wavelengths from the focal point behind the lens. Figure 3B Astigmatism curves of the optical imaging lenses of Examples 1 to 3 are shown, which represent meridional image curvature and sagittal image curvature. Figure 3C The distortion curves of the optical imaging lenses of Examples 1 to 3 are shown, which represent the distortion values ​​corresponding to different field angles. FIG. 3A to FIG. 3C It can be seen that the optical imaging lenses provided in Examples 1 to 3 can achieve good imaging quality.

[0119] Example 4

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

[0121] like Figure 4AAs shown, the lens group of the optical imaging lens 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 passes through each surface S1 to S12 in sequence and is finally imaged on an imaging surface (not shown).

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

[0123]

[0124]

[0125] Table 6

[0126] Face 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 aperture number fno is 2.19.

[0129] like Figure 4AAs shown, the optical imaging lens further includes 6 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 placed 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 placed 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 placed 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 placed 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 placed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; and the sixth fixed element P6 is placed on the image side surface of the sixth lens. Table 8 shows a basic parameter table of the spacer elements of the optical imaging lens, and the units of each parameter in Table 8 are millimeters (mm). The above-mentioned spacer elements can block the entry of excess external light, so that the lens and the lens barrel can be better supported, and the structural stability of the optical imaging lens is enhanced.

[0130] parameter D6m d6m D0m d0s EP12 EP23 EP45 D2s Numeric 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 Numeric 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 The structure diagram of the optical imaging lens according to Embodiment 5 of the present application is shown. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to Embodiment 4 will be omitted.

[0134] like Figure 4B As shown, the optical imaging lens comprises a lens barrel P0, a lens group and a plurality of spacer elements. The optical imaging lens further comprises a stop STO (not shown) disposed between the second lens and the third lens. The lens group of the optical imaging lens of Example 5 is exactly the same as the lens group of the optical imaging lens of Example 4, and its basic parameters are detailed in Tables 6 to 7. The effective focal length f, maximum field angle FOV and aperture number fno of the optical imaging lens of Example 5 are the same as those of the optical imaging lens of Example 4, and are not described in detail.

[0135] like Figure 4BAs shown, the optical imaging lens further includes 6 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 placed 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 placed 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 placed 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 placed 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 placed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; and the sixth fixed element P6 is placed on the image side surface of the sixth lens. Table 9 shows a basic parameter table of the spacer elements of the optical imaging lens, and the units of each parameter in Table 9 are millimeters (mm). The above-mentioned spacer elements can block the entry of excess external light, so that the lens and the lens barrel can be better supported, and the structural stability of the optical imaging lens is enhanced.

[0136] parameter D6m d6m D0m d0s EP12 EP23 EP45 D2s Numeric 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 Numeric 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 FIG. 4 shows a schematic diagram of the structure of an optical imaging lens according to Embodiment 6 of the present application. Figure 4C As shown, the optical imaging lens comprises a lens barrel P0, a lens group and a plurality of spacer elements. The optical imaging lens further comprises a stop STO (not shown) disposed between the second lens and the third lens. The lens group of the optical imaging lens of Example 6 is exactly the same as the lens group of the optical imaging lens of Example 4 and Example 5, and its basic parameters are detailed in Tables 6 to 7. The effective focal length f, maximum field angle FOV and aperture number fno of the optical imaging lens of Example 6 are the same as those of the optical imaging lenses of Example 4 and Example 5, and are not described in detail.

[0140] like Figure 4CAs shown, the optical imaging lens further includes 6 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 placed 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 placed 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 placed 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 placed 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 placed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; and the sixth fixed element P6 is placed on the image side surface of the sixth lens. Table 10 shows a basic parameter table of the spacer elements of the optical imaging lens, and the units of each parameter in Table 10 are millimeters (mm). The above-mentioned spacer elements can block the entry of excess external light, so that the lens and the lens barrel can be better supported, and the structural stability of the optical imaging lens is enhanced.

[0141] parameter D6m d6m D0m d0s EP12 EP23 EP45 D2s Numeric 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 Numeric 0.99 2.4 1.33 1.85 2.52 0.28 3.7 4.64

[0142] Table 10

[0143] Figure 5A The axial chromatic aberration curves of the optical imaging lenses of Examples 4 to 6 are shown, which indicate the deviation of light rays of different wavelengths from the focal point behind the lens. Figure 5B Astigmatism curves of the optical imaging lenses of Examples 4 to 6 are shown, which represent meridional image curvature and sagittal image curvature. Figure 5C The distortion curves of the optical imaging lenses of Examples 4 to 6 are shown, which represent the distortion values ​​corresponding to different field angles. FIG. 5A to FIG. 5C It can be seen that the optical imaging lenses provided in Examples 4 to 6 can achieve good imaging quality.

[0144] Example 7

[0145] Fig. 6A FIG. 2 shows a schematic structural diagram of an optical imaging lens according to Embodiment 7 of the present application. Fig. 6A As shown, the optical imaging lens includes a lens barrel P0, a lens group and a plurality of spacer elements.

[0146] like Fig. 6AAs shown, the lens group of the optical imaging lens 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 passes through each surface S1 to S12 in sequence and is finally imaged on an imaging surface (not shown).

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

[0148]

[0149]

[0150] Table 11

[0151] Face 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 aperture number fno is 2.19.

[0154] like Fig. 6AAs shown, the optical imaging lens further includes 6 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 placed 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 placed 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 placed 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 placed 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 placed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; and the sixth fixed element P6 is placed on the image side surface of the sixth lens. Table 13 shows a basic parameter table of the spacer elements of the optical imaging lens, and the units of each parameter in Table 13 are millimeters (mm). The above-mentioned spacer elements can block the entry of excess external light, so that the lens and the lens barrel can be better supported, and the structural stability of the optical imaging lens is enhanced.

[0155] parameter D6m d6m D0m d0s EP12 EP23 EP45 D2s Numeric 4.53 3.86 8 3.49 0.49 0.43 0.23 4.37 parameter d2s D3s d3s d4s d5s EPA L d0m Numeric 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 The structure diagram of the optical imaging lens according to Embodiment 8 of the present application is shown. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to Embodiment 7 will be omitted.

[0159] like Figure 6B As shown, the optical imaging lens comprises a lens barrel P0, a lens group and a plurality of spacer elements. The optical imaging lens further comprises a stop STO (not shown) disposed between the second lens and the third lens. The lens group of the optical imaging lens of Example 8 is exactly the same as the lens group of the optical imaging lens of Example 7, and its basic parameters are detailed in Tables 11 and 12. The effective focal length f, maximum field angle FOV and aperture number fno of the optical imaging lens of Example 8 are the same as those of the optical imaging lens of Example 7, and are not described in detail.

[0160] like Figure 6BAs shown, the optical imaging lens further includes 6 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 placed 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 placed 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 placed 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 placed 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 placed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; and the sixth fixed element P6 is placed on the image side surface of the sixth lens. Table 14 shows a basic parameter table of the spacer elements of the optical imaging lens, and the units of each parameter in Table 14 are millimeters (mm). The above-mentioned spacer elements can block the entry of excess external light, so that the lens and the lens barrel can be better supported, and the structural stability of the optical imaging lens is enhanced.

[0161] parameter D6m d6m D0m d0s EP12 EP23 EP45 D2s Numeric 4.53 3.86 8 3.49 0.49 0.4 0.23 4.37 parameter d2s D3s d3s d4s d5s EPA L d0m Numeric 1.22 3.97 1.48 2.23 3.43 0.23 4.3 5.03

[0162] Table 14

[0163] Example 9

[0164] Figure 6C FIG. 1 shows a schematic structural diagram of an optical imaging lens according to Embodiment 9 of the present application. Figure 6C As shown, the optical imaging lens comprises a lens barrel P0, a lens group and a plurality of spacer elements. The optical imaging lens further comprises a stop STO (not shown) disposed between the second lens and the third lens. The lens group of the optical imaging lens of Example 9 is exactly the same as the lens group of the optical imaging lens of Example 7 and Example 8, and its basic parameters are detailed in Tables 11 and 12. The effective focal length f, maximum field angle FOV and aperture number fno of the optical imaging lens of Example 9 are the same as those of the optical imaging lenses of Examples 7 and 8, and are not described in detail.

[0165] like Figure 6CAs shown, the optical imaging lens further includes 6 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 placed 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 placed 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 placed 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 placed 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 placed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; and the sixth fixed element P6 is placed on the image side surface of the sixth lens. Table 15 shows a basic parameter table of the spacer elements of the optical imaging lens, and the units of each parameter in Table 15 are millimeters (mm). The above-mentioned spacer elements can block the entry of excess external light, so that the lens and the lens barrel can be better supported, and the structural stability of the optical imaging lens is enhanced.

[0166] parameter D6m d6m D0m d0s EP12 EP23 EP45 D2s Numeric 4.53 3.86 8 3.49 0.5 0.43 0.23 4.37 parameter d2s D3s d3s d4s d5s EPA L d0m Numeric 1.22 4.47 1.51 2.23 2.95 0.23 4.3 5.03

[0167] Table 15

[0168] Fig. 7A The axial chromatic aberration curves of the optical imaging lenses of Examples 7 to 9 are shown, which indicate the deviation of light rays of different wavelengths from the focal point behind the lens. Figure 7B Astigmatism curves of the optical imaging lenses of Examples 7 to 9 are shown, which represent meridional image curvature and sagittal image curvature. Figure 7C The distortion curves of the optical imaging lenses of Examples 7 to 9 are shown, which represent the distortion values ​​corresponding to different field angles. FIG. 7A to FIG. 7C It can be seen that the optical imaging lenses provided in Examples 7 to 9 can achieve good imaging quality.

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

[0170] Conditional / Example 1 2 3 4 5 6 7 8 9 R12×L×fno / (D0m-d0m)mm 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 CT5 / CT4+EP45 / T45 6.51 6.51 6.51 4.69 4.69 4.69 6.04 6.04 6.04 (n5+n4) / (n5-n4)×d5s / d4s 31.62 31.62 29.60 33.86 33.86 33.86 65.37 65.37 56.22 D3s / d3s+|R7 / R6| 25.89 24.99 25.89 6.32 6.32 5.57 4.37 4.09 4.37 d0s / d2s+|f2 / f1| 4.53 4.53 4.53 5.41 5.41 5.41 8.96 8.96 8.96 Ctmax / EPA 2.64 2.64 2.64 2.80 2.80 2.80 3.74 3.74 3.74 CT6 / CT5 0.48 0.48 0.48 0.41 0.41 0.41 0.27 0.27 0.27 R11 / f6 -0.63 -0.63 -0.63 -0.91 -0.91 -0.91 0.87 0.87 0.87 (D6m-d6m) / (D6m+d6m) 0.08 0.08 0.08 0.05 0.05 0.05 0.08 0.08 0.08 tan(fov / 2)×d0s / D0m 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] The present application also provides an imaging device, whose electronic photosensitive element can be a photosensitive 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 in 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 used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a 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 above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other.

Claims

1. An optical imaging lens, characterized in that: Comprising: A lens barrel, 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 curvature radius R12 of the image side surface of the sixth lens, the maximum height L of the lens barrel along the optical axis, 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: 0mm <R12×L×fno / (D0m-d0m)<25mm。 6. The optical imaging lens according to claim 1, wherein: The plurality of spacer elements comprises: The second spacing element is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens; wherein, The inner diameter d2s of the object side surface of the second spacing element and the outer diameter D2s of the object side surface of the second spacing 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 comprises: 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 center 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, and the air interval T45 between the fourth lens and the fifth lens on the optical axis satisfy: <CT5 / CT4+EP45 / T45<8。 8. The optical imaging lens according to claim 1, wherein: The plurality of spacer elements comprises: 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 comprises: A third spacing element is disposed on the image side of the third lens and is in at least partial 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 curvature radius R6 of the image side surface of the third lens and the curvature radius R7 of the object side surface of the fourth lens satisfy: 3 <D3s / d3s+|R7 / R6|<30。 10. The optical imaging lens according to claim 1, wherein: The plurality of spacer elements further comprises: The second spacing element is disposed on the image side of the second lens and at least partially contacts 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。 11. The optical imaging lens according to any one of claims 1 to 3, 5, 7 to 9, characterized in that: The plurality of spacer elements further comprises: 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; The second spacer element is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens.

12. The optical imaging lens according to any one of claims 1 to 10, characterized in that: 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 in positive and negative.

13. The optical imaging lens according to any one of claims 1 to 10, characterized in that: Among the first to sixth lenses, the fifth lens has the smallest effective focal length.

14. The optical imaging lens according to claim 4 or 9, characterized in that: The light absorption rate of the third spacing element in the visible light band is greater than 85%.

15. An optical imaging lens, characterized in that: include: A lens barrel, a lens group and a plurality of spacer elements placed in the lens barrel, wherein: The lens group 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 a concave surface; the object side surface of the second lens is a convex surface, and the image side surface is a concave surface; the object side surface of the third lens is a convex surface, and the image side surface is a convex surface; the object side surface of the fourth lens is a convex surface, and the image side surface is a concave surface; the image side surface of the fifth lens is a convex surface; the image side surface of the sixth lens is a concave surface; The center thickness of the sixth lens on the optical axis is 0<CT6<0.53mm; and The curvature radius R12 of the image side surface of the sixth lens, the maximum height L of the lens barrel along the optical axis, 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)<25mm。

Images