Optical imaging lens

Abstract

The application discloses an optical imaging lens, which comprises a lens barrel, a four-piece lens group and a spacer element group arranged in the lens barrel. The four-piece lens group comprises, in order from the object side to the image side along the optical axis, a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power and a fourth lens with negative refractive power. The spacer element group comprises a second spacer element and a third spacer element. The second spacer element is arranged on the image side of the second lens and in contact with the image side of the second lens. The third spacer element is arranged on the image side of the third lens and in contact with the image side of the third lens. The inner diameter d0s of the object side end surface of the lens barrel, the inner diameter d0m of the image side end surface of the lens barrel and the interval EP23 of the second spacer element and the third spacer element along the optical axis satisfy the condition: 10 < (d0m-d0s) / EP23 < 17.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical devices, in particular to a four-piece optical imaging lens. BACKGROUND

[0002] With the continuous development of social technology, higher requirements are put forward for the shooting effect of portable electronic devices such as smart phones, for example, in order to shoot more pictures, the optical imaging lens of portable electronic devices such as smart phones needs to meet the requirement of large field of view.

[0003] In order to make the optical imaging lens meet the requirement of large field of view, the optical imaging lens is usually designed into a structure of five or more lenses, which will result in that the optical imaging lens has a large volume and a large head size, thereby causing the optical imaging lens to be unable to well adapt to the trend of light and thin portable electronic devices; at the same time, the imaging picture of the optical imaging lens is not clear.

[0004] Therefore, how to provide an optical imaging lens to make the optical imaging lens have ultra-small head, large field of view while meeting the requirement of high pixels, has become a technical problem to be solved in the field. SUMMARY

[0005] The present application provides an optical imaging lens which can at least solve or partially solve at least one problem or other problems existing in the prior art.

[0006] An aspect of the present application provides an optical imaging lens, which comprises a lens barrel, a four-piece lens group and a spacer element group arranged in the lens barrel, the four-piece lens group comprises, in order from the object side to the image side along the optical axis, a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power and a fourth lens with negative refractive power; the spacer element group comprises a second spacer element and a third spacer element, the second spacer element is arranged on the image side of the second lens and in contact with the image side of the second lens, and the third spacer element is arranged on the image side of the third lens and in contact with the image side of the third lens; wherein the inner diameter d0s of the object side end surface of the lens barrel, the inner diameter d0m of the image side end surface of the lens barrel and the interval EP23 of the second spacer element and the third spacer element along the optical axis satisfy: 10<(d0m-d0s) / EP23<17.

[0007] According to an example embodiment of the present application, the radius of curvature R6 of the image side surface of the third lens, the air interval T34 of the third lens and the fourth lens on the optical axis, the central thickness CT3 of the third lens on the optical axis and the inner diameter d3m of the image side surface of the third spacer element satisfy: -7<R6 / T34+d3m / CT3<3.

[0008] According to an example embodiment of the present application, the effective focal length f3 of the third lens, the radius of curvature R7 of the object side surface of the fourth lens, the inner diameter d3m of the image side surface of the third spacer element, the interval EP23 of the second spacer element and the third spacer element along the optical axis, and the maximum thickness CP3 of the third spacer element satisfy: 10 < f3 / R7 + d3m / (EP23 + CP3) < 14.

[0009] According to an example embodiment of the present application, the outer diameter D0m of the image side end surface of the lens barrel, the length L of the lens barrel in the direction of the optical axis, the effective focal length f2 of the second lens, and the effective focal length f3 of the third lens satisfy: 4 < D0m / L + |f2 / f3| < 7.

[0010] According to an example embodiment of the present application, the spacer element group further includes a first spacer element disposed on and in contact with the image side surface of the first lens, wherein the maximum thickness CP1 of the first spacer element, the interval EP12 of the first spacer element and the second spacer element along the optical axis, the central thickness CT1 of the first lens in the optical axis, the air interval T12 of the first lens and the second lens in the optical axis, the outer diameter D3s of the object side surface of the third spacer element, and the radius of curvature R6 of the image side surface of the third lens satisfy: 6 < (CP1 + EP12) / (CT1 - T12) + |D3s / R6| < 30.

[0011] According to an example embodiment of the present application, the spacer element group further includes a first spacer element disposed on and in contact with the image side surface of the first lens, wherein the maximum absolute value |fmax| of the effective focal length of all the lenses among the first lens to the fourth lens, and the interval EP12 of the first spacer element and the second spacer element along the optical axis satisfy: 18 < |fmax| / EP12 < 65.

[0012] According to an example embodiment of the present application, the spacer element group further includes a first spacer element disposed on and in contact with the image side surface of the first lens, wherein the outer diameter D1s of the object side surface of the first spacer element, the interval EP01 of the object side end surface of the lens barrel and the first spacer element along the optical axis, the outer diameter D2s of the object side surface of the second spacer element, and the central thickness CT1 of the first lens in the optical axis satisfy: 14 < D1s / EP01 + D2s / CT1 < 20.

[0013] According to an example embodiment of the present application, the radius of curvature R5 of the object side surface of the third lens, the radius of curvature R6 of the image side surface of the third lens, the air interval T23 of the second lens and the third lens in the optical axis, the inner diameter d3s of the object side surface of the third spacer element, and the maximum thickness CP3 of the third spacer element satisfy: 6 < (d3s / CP3) / (R6 - R5) x T23 < 35.

[0014] According to an example embodiment of the present application, the fourth lens has a curvature radius R7 of the object side surface and a curvature radius R8 of the image side surface, and R7 / R8>0.

[0015] According to an example embodiment of the present application, the second lens has a curvature radius R4 of the image side surface and the third lens has a curvature radius R5 of the object side surface, and R4 / R5<0.

[0016] Another aspect of the present application provides an optical imaging lens, which includes a lens barrel, a four-lens group and a spacer group arranged in the lens barrel, the four-lens group including, in order from the object side to the image side along the optical axis, a first lens having positive refractive power, a second lens having negative refractive power, a third lens having positive refractive power, and a fourth lens having negative refractive power; the spacer group including a third spacer arranged on the image side of the third lens and in contact with the image side of the third lens; wherein the third lens has a curvature radius R5 of the object side surface, the third lens has a curvature radius R6 of the image side surface, the second lens and the third lens have an air gap T23 on the optical axis, the third spacer has an inner diameter d3s of the object side surface, and the third spacer has a maximum thickness CP3, and 6<(d3s / CP3) / (R6-R5)×T23<35.

[0017] The four-lens optical imaging lens provided by the present application reasonably allocates the refractive power of each lens, and restricts the ratio of the difference between the inner diameters of the image side end surface and the object side end surface of the lens barrel and the edge thickness of the second lens within a reasonable range, so as to ensure that the optical imaging lens has a large field of view angle, can shoot scenes in a large field of view range, and has an ultra-small head while meeting the high-pixel requirement, so as to meet the size requirement of foldable screen mobile phones or ultra-thin mobile phones. BRIEF DESCRIPTION OF DRAWINGS

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

[0019] Figure 1 The structure schematic diagram of the optical imaging lens according to the present application is shown;

[0020] Figure 2 The structure schematic diagram of the optical imaging lens according to the first embodiment of the present application is shown;

[0021] Figure 3 The structure schematic diagram of the optical imaging lens according to the second embodiment of the first embodiment of the present application is shown;

[0022] Figure 4A structural diagram of the optical imaging lens according to Embodiment 3 of the first embodiment of the present application is shown;

[0023] Figures 5A to 5D Axial chromatic aberration curves, astigmatism curves, distortion curves and lateral chromatic aberration curves of the optical imaging lens according to the first embodiment of the present application are shown respectively;

[0024] Figure 6 A structural diagram of the optical imaging lens according to Embodiment 1 of the second embodiment of the present application is shown;

[0025] Figure 7 A structural diagram of the optical imaging lens according to Embodiment 2 of the second embodiment of the present application is shown;

[0026] Figure 8 A structural diagram of the optical imaging lens according to Embodiment 3 of the second embodiment of the present application is shown;

[0027] Figures 9A to 9D Axial chromatic aberration curves, astigmatism curves, distortion curves and lateral chromatic aberration curves of the optical imaging lens according to the second embodiment of the present application are shown respectively;

[0028] Figure 10 A structural diagram of the optical imaging lens according to Embodiment 1 of the third embodiment of the present application is shown;

[0029] Figure 11 A structural diagram of the optical imaging lens according to Embodiment 2 of the third embodiment of the present application is shown;

[0030] Figure 12 A structural diagram of the optical imaging lens according to Embodiment 3 of the third embodiment of the present application is shown; and

[0031] Figures 13A to 13D Axial chromatic aberration curves, astigmatism curves, distortion curves and lateral chromatic aberration curves of the optical imaging lens according to the third embodiment of the present application are shown respectively. DETAILED DESCRIPTION

[0032] For a better understanding of the present application, various aspects of the present application will be described in more detail below with reference to the accompanying drawings. It is to be understood that the detailed description is merely descriptive of exemplary embodiments of the present application and is not intended to limit the scope of the present application in any way. Throughout the specification, like reference numerals refer to like elements.

[0033] It should be noted that the terms first, second, third, etc. in the present specification are merely used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.

[0034] In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shape of the spherical or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0035] In this document, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the position of the convex surface is not specified, 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 specified, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the image plane is referred to as the image side surface of the lens.

[0036] It should also be understood that the words "comprise", "comprising", "include", "including", and / or "contain", when used in this specification, mean that something is included, but do not exclude the presence of one or more additional features, elements, components, and / or combinations thereof. In addition, when describing the embodiments of the present application, the word "may" means "one or more embodiments of the present application". Also, the word "exemplary" is intended to mean an example or an illustration.

[0037] 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 the terms should be interpreted as having a meaning that is 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.

[0038] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments.

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

[0040] Figure 1 The structural arrangement diagram and the schematic diagram of some parameters of the optical imaging lens according to the exemplary embodiments of the present application are shown. Those skilled in the art should understand that some parameters often used in the field, such as the outer diameter D1s of the object side surface of the first spacer element and the outer diameter D2s of the object side surface of the second spacer element, are not shown in the drawings. Figure 1 Figure 1 ​The partial parameters of the barrel and the spacer elements of the optical imaging lens of the present application are only exemplarily shown to facilitate better understanding of the present application, such as Figure 1 As shown in the figure, d3s represents the inner diameter of the object side surface of the third spacer element, d3m represents the inner diameter of the image side surface of the third spacer element, D3s represents the outer diameter of the object side surface of the third spacer element, d0s represents the inner diameter of the object side end surface of the barrel, d0m represents the inner diameter of the image side end surface of the barrel, D0m represents the outer diameter of the image side end surface of the barrel, CP1 represents the maximum thickness of the first spacer element, EP12 represents the interval of the first spacer element and the second spacer element along the optical axis, EP23 represents the interval of the second spacer element and the third spacer element along the optical axis, CP3 represents the maximum thickness of the third spacer element, and L represents the length of the barrel in the direction of the optical axis.

[0041] The features, principles and other aspects of the present application are described in detail below.

[0042] As shown in the figures, Figures 2 to 4 , Figures 6 to 8 and Figures 10 to 12 , the optical imaging lens according to the exemplary embodiments of the present application can include a barrel and a four-piece lens group disposed in the barrel, and the four-piece lens group can include, in order from the object side to the image side along the optical axis, a first lens having positive refractive power, a second lens having negative refractive power, a third lens having positive refractive power, and a fourth lens having negative refractive power. Among the first lens to the fourth lens, any two adjacent lenses can have an air gap therebetween.

[0043] The optical imaging lens can further include a spacer element group disposed in the barrel, and the spacer element group can include a second spacer element and a third spacer element, the second spacer element being disposed on and in contact with the image side surface of the second lens, and the third spacer element being disposed on and in contact with the image side surface of the third lens. Moreover, the inner diameter d0s of the object side end surface of the barrel, the inner diameter d0m of the image side end surface of the barrel, and the interval EP23 of the second spacer element and the third spacer element along the optical axis can satisfy: 10 < (d0m-d0s) / EP23 < 17. The four-piece optical imaging lens provided by the present application reasonably allocates the refractive power of each lens while constraining the ratio of the difference between the inner diameters of the image side end surface and the object side end surface of the barrel to the edge thickness of the second lens within a reasonable range, thereby ensuring that the optical imaging lens has a large field of view angle, can capture scenes within a large field of view range, and while satisfying the high pixel requirement of the optical imaging lens, ensures that the optical imaging lens has an ultra-small head to meet the size requirements of foldable screen mobile phones or ultra-thin mobile phones, etc.

[0044] In an example, the set of spacer elements can further include a first spacer element disposed on and in contact with the image-side surface of the first lens. In another example, the set of spacer elements can further include a fourth spacer element disposed on and in contact with the object-side surface of the fourth lens. An auxiliary spacer element can be disposed between the third spacer element and the fourth spacer element. Reasonable use of the spacer elements can effectively avoid stray light risk, reduce interference with image quality, and thus improve the imaging quality of the optical imaging lens.

[0045] In an example embodiment, the radius of curvature R5 of the object-side surface of the third lens, the radius of curvature R6 of the image-side surface of the third lens, the air separation T23 of the second lens and the third lens on the optical axis, the inner diameter d3s of the object-side surface of the third spacer element, and the maximum thickness CP3 of the third spacer element can satisfy: 6 < (d3s / CP3) / (R6-R5) x T23 < 35. By controlling the radii of curvature of the object-side surface and the image-side surface of the third lens, the third lens can be ensured to have a suitable positive focal power, thereby correcting the on-axis spherical aberration of the optical imaging lens and reducing the peripheral astigmatism field curvature. In combination with controlling the inner diameter of the object-side surface of the third spacer element and the maximum thickness, the transmitted stray light generated by the effective diameter edge of the object-side surface of the second lens can be effectively blocked, and the imaging quality of the optical imaging lens can be improved.

[0046] In an example embodiment, the maximum absolute value |fmax| of the effective focal length of all the lenses in the first lens to the fourth lens and the separation EP12 of the first spacer element and the second spacer element along the optical axis can satisfy: 18 < |fmax| / EP12 < 65. In an example, the absolute value of the effective focal length of the second lens is maximum. In another example, the absolute value of the effective focal length of the fourth lens is maximum. By restricting the ratio of the maximum focal length absolute value to the edge thickness of the second lens to a certain range, the spherical aberration contribution of the lens with the maximum focal length absolute value can be limited to a reasonable range, ensuring that the optical imaging lens has good imaging quality in the on-axis field of view. In addition, the size uniformity of the second lens can be ensured by controlling the edge thickness of the second lens, and the processability of the second lens can be improved.

[0047] In the example embodiment, the outer diameter D0m of the image-side end surface of the lens barrel, the length L of the lens barrel in the direction of the optical axis, the effective focal length f2 of the second lens, and the effective focal length f3 of the third lens can satisfy: 4 < D0m / L + |f2 / f3| < 7. By restricting the ratio of the outer diameter of the image-side end surface of the lens barrel to the length of the lens barrel in the direction of the optical axis to a certain range, the overall structure of the optical imaging lens can be kept within a reasonable range, the space of the optical imaging lens is reduced, and the optical imaging lens is miniaturized. At the same time, by controlling the ratio of the effective focal length of the second lens to the effective focal length of the third lens, the object-side end of the optical imaging lens has sufficient converging ability to adjust the light beam focusing position of the optical imaging lens, thereby shortening the total optical length of the optical imaging lens and ensuring that the optical imaging lens meets the requirements of miniaturization and thinness.

[0048] In the example embodiment, the maximum thickness CP1 of the first spacer element, the interval EP12 of the first spacer element and the second spacer element along the optical axis, the central thickness CT1 of the first lens in the optical axis, the air interval T12 of the first lens and the second lens in the optical axis, the outer diameter D3s of the object-side surface of the third spacer element, and the radius of curvature R6 of the image-side surface of the third lens can satisfy: 6 < (CP1 + EP12) / (CT1 - T12) + |D3s / R6| < 30. By controlling the above condition, the central thickness of the first lens and the second lens in the optical axis is reasonably configured, the lens size distribution is uniform, the assembly stability of the lens is ensured, the aberration of the entire optical imaging lens is reduced, the total optical length of the optical imaging lens is shortened, the miniaturization and thinness of the optical imaging lens are achieved, and the first-order stray light hitting the inner diameter surface of the auxiliary spacer element opposite to the third spacer element is effectively blocked by the third spacer element, thereby improving the imaging quality of the optical imaging lens.

[0049] In the example embodiment, the radius of curvature R6 of the image-side surface of the third lens, the air interval T34 of the third lens and the fourth lens in the optical axis, the central thickness CT3 of the third lens in the optical axis, and the inner diameter d3m of the image-side surface of the third spacer element can satisfy: -7 < R6 / T34 + d3m / CT3 < 3. By restricting the ratio of the inner diameter of the image-side surface of the third spacer element to the central thickness of the third lens in the optical axis to a certain range, the deflection angle of the light is controlled, the overall size of the optical imaging lens is controlled to the greatest extent, the miniaturization of the optical imaging lens is ensured, and the principal point of the optical imaging lens is away from the image-side end, the total optical length of the optical imaging lens is shortened, the miniaturization of the optical imaging lens is ensured, and the off-axis aberration of the optical imaging lens is corrected to improve the peripheral imaging quality.

[0050] In an exemplary embodiment, the outer diameter D1s of the object side surface of the first spacer element, the object side end surface of the lens barrel, the interval EP01 of the first spacer element along the optical axis, the outer diameter D2s of the object side surface of the second spacer element, and the central thickness CT1 of the first lens on the optical axis can satisfy: 14 < D1s / EP01 + D2s / CT1 < 20. By restricting the ratio of the outer diameter of the object side surface of the first spacer element to the interval of the object side end surface of the lens barrel and the first spacer element along the optical axis within a certain range, the edge thickness of the first lens and the front end wall thickness of the lens barrel are reasonably distributed, the processability of the first lens and the lens barrel is ensured, and the ratio of the outer diameter of the object side surface of the second spacer element to the central thickness of the first lens on the optical axis is cooperatively controlled to improve the processability of the first lens.

[0051] In an exemplary embodiment, the effective focal length f3 of the third lens, the radius of curvature R7 of the object side surface of the fourth lens, the inner diameter d3m of the image side surface of the third spacer element, the interval EP23 of the second spacer element and the third spacer element along the optical axis, and the maximum thickness CP3 of the third spacer element can satisfy: 10 < f3 / R7 + d3m / (EP23 + CP3) < 14. By controlling the above condition, the astigmatism of the optical imaging lens can be effectively balanced, the miniaturization of the optical imaging lens can be ensured, the deflection angle of light passing through the second lens can also be controlled, and the tolerance sensitivity of the optical imaging lens is reduced.

[0052] In an exemplary embodiment, the radius of curvature R7 of the object side surface of the fourth lens and the radius of curvature R8 of the image side surface of the fourth lens can satisfy: R7 / R8 > 0. By controlling the ratio of the radius of curvature of the object side surface and the image side surface of the fourth lens to be greater than zero, the fourth lens is helped to have a negative focal power, so that the principal point of the optical imaging lens is away from the image side end, the optical total length of the optical imaging lens is shortened, the miniaturization of the optical imaging lens is ensured, and the off-axis aberration of the optical imaging lens is corrected to improve the peripheral imaging quality.

[0053] In an exemplary embodiment, the radius of curvature R4 of the image side surface of the second lens and the radius of curvature R5 of the object side surface of the third lens can satisfy: R4 / R5 < 0. By controlling the ratio of the radius of curvature of the image side surface of the second lens to the radius of curvature of the object side surface of the third lens to be less than zero, the light guided through the second lens can be quickly converged, and the converging light aperture can be ensured, and the opposite face type of the third lens can be used to correct the peripheral aberration to improve the imaging quality of the optical imaging lens.

[0054] In an exemplary embodiment, the optical imaging lens further comprises a diaphragm arranged between the object side and the first lens.

[0055] The optical imaging lens according to the above-mentioned embodiments of the present application can adopt four lenses and multiple spacer elements. By reasonably allocating the parameters of each lens and each spacer element, the optical imaging lens can achieve ultra-small head, miniaturization, light and thin, and large field of view, improve the stray light phenomenon of the optical imaging lens, and improve the imaging quality of the optical imaging lens.

[0056] In the embodiments of the present application, at least one of the mirror surfaces of each of the first lens to the fourth lens is a non-spherical mirror surface. The non-spherical lens has the characteristic that the curvature continuously changes from the center of the lens to the periphery of the lens. Unlike the spherical lens which has a constant curvature from the center of the lens to the periphery of the lens, the non-spherical lens has better curvature radius characteristics, has the advantages of improving the distortion aberration and improving the astigmatism aberration. After using the non-spherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality. Alternatively, the object side and the image side of each of the first lens to the fourth lens are non-spherical mirror surfaces.

[0057] However, those skilled in the art should understand that the number of lenses and spacer elements constituting the optical imaging lens can be changed without departing from the technical solutions claimed by the present application, to obtain the various results and advantages described in the present specification.

[0058] The specific embodiments of the optical imaging lens applicable to the above-mentioned embodiments are further described below with reference to the accompanying drawings.

[0059] First embodiment

[0060] The following refers to Figures 2 to 5D The optical imaging lens according to the first embodiment of the present application is described. Figure 2 The structural schematic diagram of the optical imaging lens 110 according to the first embodiment of the present application is shown; Figure 3 The structural schematic diagram of the optical imaging lens 120 according to the second embodiment of the first embodiment of the present application is shown; Figure 4 The structural schematic diagram of the optical imaging lens 130 according to the third embodiment of the first embodiment of the present application is shown.

[0061] As Figures 2 to 4As shown, the optical imaging lens 110, 120, 130 each includes a lens barrel, and a four-piece lens group and a spacer element group disposed in the lens barrel. The four-piece lens group includes, in order from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4. A stop STO can be disposed between the object side and the first lens E1. The spacer element group includes a first spacer element P1, a second spacer element P2, a third spacer element P3, and a fourth spacer element P4, with a third auxiliary spacer element disposed between the third spacer element P3 and the fourth spacer element P4. The spacer elements can block excess light rays during imaging from entering the next lens, while better supporting the lens and the lens barrel, thereby enhancing the structural stability of the optical imaging lens.

[0062] The first lens E1 has positive refractive power, with a convex object side surface S1 and a concave image side surface S2. The second lens E2 has negative refractive power, with a convex object side surface S3 and a concave image side surface S4. The third lens E3 has positive refractive power, with a concave object side surface S7 and a convex image side surface S8. The fourth lens E4 has negative refractive power, with a convex object side surface S9 and a concave image side surface S10. The filter has an object side surface S9 (not shown) and an image side surface S10 (not shown). Light from an object passes through the surfaces S1-S10 in order and is ultimately imaged on an imaging surface S11 (not shown).

[0063] Table 1 shows a basic parameter table of the optical imaging lens of the first embodiment, where the units of the radius of curvature, the thickness / distance, and the focal length are all millimeters (mm).

[0064]

[0065]

[0066] Table 1

[0067] In the present embodiment, the total effective focal length f of the optical imaging lens is 2.17 mm, the on-axis distance TTL from the object side surface of the first lens to the imaging surface is 3.04 mm, the maximum field of view FOV of the optical imaging lens is 46.75°, and the aperture number Fno of the optical imaging lens is 2.21.

[0068] In the first embodiment, the object side surface and the image side surface of any one of the first lens E1 to the fourth lens E4 are aspherical surfaces. The surface type x of each aspherical surface can be defined using, but not limited to, the following aspherical surface formula:

[0069]

[0070] Where x is the distance vector from the vertex of the aspherical surface at a height h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 gives the higher-order coefficients A4, A6, A8, A1, and A2 that can be used for each aspherical mirror S1-S8 in the first embodiment. 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 and A 30 .

[0071] Face number A4 A6 A8 A10 A12 A14 A16 S1 -3.0480E-01 1.9942E+01 -9.1266E+02 2.4852E+04 -4.4027E+05 5.3012E+06 -4.4431E+07 S2 -1.2017E-01 -1.5207E+01 7.5856E+02 -2.3117E+04 4.5878E+05 -6.2667E+06 6.0755E+07 S3 -6.3196E-01 8.4836E-02 -3.1706E+01 1.1847E+02 9.2308E+03 -1.9879E+05 2.0866E+06 S4 -7.8041E-02 -4.3262E+00 -1.7286E+00 8.8166E+02 -1.4780E+04 1.3684E+05 -8.3145E+05 S5 9.2035E-01 -6.9671E+00 3.8092E+01 -1.2526E+02 5.6039E+01 1.7056E+03 -9.3761E+03 S6 -2.5867E-01 1.5666E+00 -5.7424E+00 5.9909E+00 7.7365E+01 -5.2511E+02 1.7731E+03 S7 -1.9200E+00 2.6447E+00 -2.0056E+00 -1.0422E+00 6.0550E+00 -9.9868E+00 1.0050E+01 S8 -2.6728E+00 5.7968E+00 -1.0625E+01 1.5356E+01 -1.7053E+01 1.4393E+01 -9.1737E+00 Face number A18 A20 A22 A24 A26 A28 A30 S1 2.6141E+08 -1.0729E+09 2.9997E+09 -5.4254E+09 5.6985E+09 -2.6250E+09 0.0000E+00 S2 -4.2455E+08 2.1450E+09 -7.7608E+09 1.9594E+10 -3.2760E+10 3.2568E+10 -1.4562E+10 S3 -1.3644E+07 5.9618E+07 -1.7744E+08 3.5585E+08 -4.6042E+08 3.4710E+08 -1.1577E+08 S4 3.5020E+06 -1.0420E+07 2.1862E+07 -3.1665E+07 3.0135E+07 -1.6955E+07 4.2730E+06 S5 2.7330E+04 -5.1238E+04 6.4611E+04 -5.4666E+04 2.9824E+04 -9.4945E+03 1.3411E+03 S6 -3.7657E+03 5.3478E+03 -5.1738E+03 3.3805E+03 -1.4316E+03 3.5544E+02 -3.9329E+01 S7 -6.8861E+00 3.3134E+00 -1.1216E+00 2.6183E-01 -4.0143E-02 3.6388E-03 -1.4779E-04 S8 4.3846E+00 -1.5541E+00 4.0097E-01 -7.2963E-02 8.8547E-03 -6.4210E-04 2.1017E-05

[0072] Table 2

[0073] The optical imaging lenses 110, 120, and 130 in Embodiments 1, 2, and 3 of the first embodiment differ in the structural dimensions of their included lens barrels and spacers. Table 3 lists some basic parameters of the lens barrels and spacers of the optical imaging lenses 110, 120, and 130 of the first embodiment, such as D1s, D2s, d3s, d3m, D3s, d0s, d0m, D0m, EP01, CP1, EP12, EP23, CP3, and L, etc. Some of the basic parameters listed in Table 3 are based on... Figure 1 The measurements were obtained using the annotation method shown, and the units of the basic parameters listed in Table 3 are all millimeters (mm).

[0074] Example / parameter D1s D2s d3s d3m D3s d0s d0m D0m EP01 CP1 EP12 EP23 CP3 L 1-1 2.26 3.22 2.42 2.38 4.12 1.46 5.11 6.83 0.31 0.02 0.44 0.29 0.02 2.40 1-2 2.16 3.12 2.49 2.45 3.92 1.36 4.99 6.95 0.25 0.02 0.41 0.32 0.03 2.38 1-3 2.01 3.20 2.33 2.28 4.02 1.28 5.17 6.74 0.31 0.02 0.42 0.31 0.02 2.42

[0075] Table 3

[0076] Figure 5A The on-axis chromatic aberration curves of the optical imaging lenses 110, 120 and 130 of the first embodiment are shown, which represent the deflection of the focal point of light of different wavelengths after passing through the optical imaging lenses 110, 120 and 130. Figure 5B The astigmatism curves of the optical imaging lenses 110, 120 and 130 of the first embodiment are shown, which represent the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Figure 5C The distortion curves of the optical imaging lenses 110, 120 and 130 of the first embodiment are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 5DThe magnification chromatic aberration curves of the optical imaging lenses 110, 120, and 130 of the first embodiment are shown, representing the deviations in image height at different points on the imaging plane after light passes through the lens. According to... Figures 5A to 5D It can be seen that the optical imaging lenses 110, 120 and 130 given in the first embodiment can achieve good imaging quality.

[0077] Second embodiment

[0078] The following is for reference Figures 6 to 9D Describes an optical imaging lens according to a second embodiment of this application. Figure 6 A schematic diagram of the structure of an optical imaging lens 210 according to Embodiment 1 of the second embodiment of this application is shown; Figure 7 A schematic diagram of the structure of an optical imaging lens 220 according to Embodiment 2 of the second embodiment of this application is shown; Figure 8 A schematic diagram of the structure of an optical imaging lens 230 according to Embodiment 3 of the second embodiment of this application is shown.

[0079] like Figures 6 to 8 As shown, optical imaging lenses 210, 220, and 230 all include a lens barrel and a four-element lens group and a spacer element group housed within the lens barrel. The four-element lens group, from the object side to the image side, includes: a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4. An aperture stop STO can be positioned between the object side and the first lens E1. The spacer element group includes: a first spacer element P1, a second spacer element P2, a third spacer element P3, and a fourth spacer element P4. A third auxiliary spacer element is positioned between the third spacer element P3 and the fourth spacer element P4. The spacer elements can block excess light from entering the next lens during the imaging process, while also allowing the lens to better contact the lens barrel, thus enhancing the structural stability of the optical imaging lens.

[0080] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fourth lens E4 has negative optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The filter has an object-side surface S9 (not shown) and an image-side surface S10 (not shown). Light from the object passes sequentially through each surface S1 to S10 and is finally imaged onto the imaging surface S11 (not shown).

[0081] Table 4 shows the basic parameters of the optical imaging lens of the second embodiment, where the units for radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0082]

[0083] Table 4

[0084] In this embodiment, the total effective focal length f of the optical imaging lens is 2.47 mm, the on-axis distance TTL from the object side of the first lens to the imaging plane is 3.07 mm, the maximum field of view FOV of the optical imaging lens is 46.08°, and the aperture number Fno of the optical imaging lens is 2.26.

[0085] In the second embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the fourth lens E4 are aspherical. Table 5 shows the higher-order coefficients A4, A6, A8, and A6 that can be used for each aspherical mirror S1-S8 in the second embodiment. 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 and A 30 .

[0086] Face number A4 A6 A8 A10 A12 A14 A16 S1 -3.7518E-01 2.7869E+01 -1.1571E+03 3.0916E+04 -5.5637E+05 6.9717E+06 -6.2233E+07 S2 -7.2980E-02 4.8469E+00 -3.2227E+02 1.0445E+04 -2.0866E+05 2.7792E+06 -2.5721E+07 S3 -8.2807E-01 5.8725E+00 -3.2482E+01 -2.4090E+03 7.9299E+04 -1.3186E+06 1.4078E+07 S4 -1.7236E+00 3.6562E+01 -7.5826E+02 1.1279E+04 -1.2045E+05 9.3435E+05 -5.3195E+06 S5 -1.6963E+00 1.9235E+01 -2.1961E+02 2.0031E+03 -1.3340E+04 6.4356E+04 -2.2582E+05 S6 -1.1649E+00 1.0325E+00 6.2975E+01 -8.3891E+02 6.1285E+03 -2.9210E+04 9.5905E+04 S7 -1.7974E+00 2.6011E+00 -3.0343E+00 3.1810E+00 -3.0883E+00 2.6487E+00 -1.8336E+00 S8 -1.8366E+00 3.4557E+00 -5.7649E+00 7.9122E+00 -8.6153E+00 7.2788E+00 -4.7028E+00 Face number A18 A20 A22 A24 A26 A28 A30 S1 4.0081E+08 -1.8666E+09 6.2251E+09 -1.4489E+10 2.2341E+10 -2.0496E+10 8.4636E+09 S2 1.6877E+08 -7.8945E+08 2.6104E+09 -5.9492E+09 8.8700E+09 -7.7668E+09 3.0191E+09 S3 -1.0298E+08 5.2676E+08 -1.8810E+09 4.5877E+09 -7.2702E+09 6.7320E+09 -2.7578E+09 S4 2.2315E+07 -6.8682E+07 1.5286E+08 -2.3899E+08 2.4856E+08 -1.5423E+08 4.3147E+07 S5 5.8328E+05 -1.1217E+06 1.6085E+06 -1.6891E+06 1.2353E+06 -5.6294E+05 1.2002E+05 S6 -2.2134E+05 3.6090E+05 -4.1291E+05 3.2398E+05 -1.6592E+05 4.9922E+04 -6.6871E+03 S7 9.5698E-01 -3.6206E-01 9.6347E-02 -1.7338E-02 1.9714E-03 -1.2367E-04 3.0255E-06 S8 2.2954E+00 -8.3455E-01 2.2148E-01 -4.1531E-02 5.2002E-03 -3.8946E-04 1.3177E-05

[0087] Table 5

[0088] The optical imaging lenses 210, 220, and 230 in embodiments 1, 2, and 3 of the second embodiment differ in the structural dimensions of their included lens barrels and spacers. Table 6 lists some basic parameters of the lens barrels and spacers of the optical imaging lenses 210, 220, and 230 of the second embodiment, such as D1s, D2s, d3s, d3m, D3s, d0s, d0m, D0m, EP01, CP1, EP12, EP23, CP3, and L, etc. Some of the basic parameters listed in Table 6 are based on... Figure 1 The measurements were obtained using the annotation method shown, and the units of the basic parameters listed in Table 6 are all millimeters (mm).

[0089] Example / parameter D1s D2s d3s d3m D3s d0s d0m D0m EP01 CP1 EP12 EP23 CP3 L 2-1 1.96 2.90 2.17 2.17 3.88 1.61 4.96 7.45 0.24 0.02 0.33 0.32 0.02 2.40 2-2 1.90 3.00 2.10 2.02 3.56 1.43 5.08 7.25 0.22 0.02 0.35 0.27 0.02 2.35 2-3 2.02 2.60 1.94 1.89 3.63 1.34 5.22 7.15 0.26 0.02 0.30 0.24 0.01 2.30

[0090] Table 6

[0091] Figure 9A The on-axis chromatic aberration curves of the optical imaging lenses 210, 220 and 230 of the second embodiment are shown, which represent the deflection of the focal point of light of different wavelengths after passing through the optical imaging lenses 210, 220 and 230. Figure 9B The astigmatism curves of the optical imaging lenses 210, 220 and 230 of the second embodiment are shown, which represent the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights.Figure 9C The distortion curves of the optical imaging lenses 210, 220 and 230 of the second embodiment are shown, which represent the distortion size values corresponding to different image heights. Figure 9D The lateral chromatic aberration curves of the optical imaging lenses 210, 220 and 230 of the second embodiment are shown, which represent the deviation of light rays on the imaging plane at different image heights after passing through the lenses. According to the lateral chromatic aberration curves, the optical imaging lenses 210, 220 and 230 of the second embodiment can achieve good imaging quality. Figures 9A to 9D It can be seen that the optical imaging lenses 210, 220 and 230 of the second embodiment can achieve good imaging quality.

[0092] Third embodiment

[0093] The following refers to Figures 10 to 13D An optical imaging lens according to a third embodiment of the present application is described. Figure 10 A structural schematic diagram of the optical imaging lens 310 of Example 1 according to the third embodiment of the present application is shown; Figure 11 A structural schematic diagram of the optical imaging lens 320 of Example 2 according to the third embodiment of the present application is shown; Figure 12 A structural schematic diagram of the optical imaging lens 330 of Example 3 according to the third embodiment of the present application is shown.

[0094] As shown in Figures 10 to 12 The optical imaging lenses 310, 320 and 330 each include a lens barrel, a four-piece lens group and a spacer element group disposed in the lens barrel. The four-piece lens group includes, in order from the object side to the image side, a first lens E1, a second lens E2, a third lens E3 and a fourth lens E4. A stop STO can be disposed between the object side and the first lens E1. The spacer element group includes a first spacer element P1, a second spacer element P2, a third spacer element P3 and a fourth spacer element P4, and a third auxiliary spacer element is disposed between the third spacer element P3 and the fourth spacer element P4. The spacer elements can block excess light rays in the imaging process from entering the next lens, and at the same time make the lens and the lens barrel better abut, thereby enhancing the structural stability of the optical imaging lens.

[0095] The first lens E1 has positive refractive power, and its object side surface S1 is a convex surface and its image side surface S2 is a concave surface. The second lens E2 has negative refractive power, and its object side surface S3 is a convex surface and its image side surface S4 is a concave surface. The third lens E3 has positive refractive power, and its object side surface S7 is a concave surface and its image side surface S8 is a convex surface. The fourth lens E4 has negative refractive power, and its object side surface S9 is a convex surface and its image side surface S10 is a concave surface. The filter has an object side surface S9 (not shown) and an image side surface S10 (not shown). Light from an object passes through the surfaces S1 to S10 in order and is finally imaged on an imaging surface S11 (not shown).

[0096] Table 7 shows the basic parameters of the optical imaging lens of the third embodiment, where the units for radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0097]

[0098] Table 7

[0099] In this embodiment, the total effective focal length f of the optical imaging lens is 2.16 mm, the on-axis distance TTL from the object side of the first lens to the imaging plane is 3.00 mm, the maximum field of view FOV of the optical imaging lens is 43.60°, and the aperture number Fno of the optical imaging lens is 2.25.

[0100] In the third embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the fourth lens E4 are aspherical. Table 8 lists the higher-order coefficients A4, A6, A8, and A6 that can be used for each aspherical mirror S1-S8 in the third embodiment. 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 and A 30 .

[0101] Face number A4 A6 A8 A10 A12 A14 A16 S1 1.8887E-01 -1.9634E+01 8.4417E+02 -2.3716E+04 4.4783E+05 -5.8533E+06 5.3764E+07 S2 1.5264E-01 -4.2397E+01 1.9859E+03 -5.6978E+04 1.0747E+06 -1.4004E+07 1.2973E+08 S3 -6.3554E-01 -1.1385E+01 6.5544E+02 -2.0291E+04 3.7010E+05 -4.3646E+06 3.5082E+07 S4 -1.8200E-01 5.3015E+00 -3.5698E+02 7.7874E+03 -9.8530E+04 8.2227E+05 -4.7751E+06 S5 6.1390E-01 -2.3107E+00 -2.6930E+01 4.8097E+02 -3.5703E+03 1.6219E+04 -4.9365E+04 S6 -6.7665E-01 1.7270E+00 2.2253E+01 -2.9597E+02 1.8382E+03 -7.1741E+03 1.9034E+04 S7 -2.5478E+00 5.4137E+00 -9.5281E+00 1.3488E+01 -1.4996E+01 1.3135E+01 -9.0479E+00 S8 -2.9570E+00 7.0378E+00 -1.3836E+01 2.0972E+01 -2.4075E+01 2.0851E+01 -1.3608E+01 Face number A18 A20 A22 A24 A26 A28 A30 S1 -3.4820E+08 1.5760E+09 -4.8622E+09 9.7137E+09 -1.1296E+10 5.7896E+09 0.0000E+00 S2 -8.6667E+08 4.1863E+09 -1.4480E+10 3.4955E+10 -5.5915E+10 5.3247E+10 -2.2847E+10 S3 -1.9772E+08 7.9002E+08 -2.2281E+09 4.3383E+09 -5.5497E+09 4.1975E+09 -1.4225E+09 S4 1.9773E+07 -5.8801E+07 1.2463E+08 -1.8369E+08 1.7879E+08 -1.0326E+08 2.6785E+07 S5 1.0391E+05 -1.5200E+05 1.5191E+05 -9.9080E+04 3.8151E+04 -6.6924E+03 6.9881E+01 S6 -3.5334E+04 4.6323E+04 -4.2690E+04 2.7069E+04 -1.1250E+04 2.7608E+03 -3.0335E+02 S7 4.8332E+00 -1.9586E+00 5.8571E-01 -1.2449E-01 1.7730E-02 -1.5136E-03 5.8487E-05 S8 6.6676E+00 -2.4311E+00 6.4814E-01 -1.2246E-01 1.5503E-02 -1.1779E-03 4.0564E-05

[0102] Table 8

[0103] The optical imaging lenses 310, 320, and 330 in embodiments 1, 2, and 3 of the third embodiment differ in the structural dimensions of their included lens barrels and spacers. Table 9 lists some basic parameters of the lens barrels and spacers of the optical imaging lenses 310, 320, and 330 of the third embodiment, such as D1s, D2s, d3s, d3m, D3s, d0s, d0m, D0m, EP01, CP1, EP12, EP23, CP3, and L, etc. Some of the basic parameters listed in Table 9 are based on... Figure 1 The measurements were obtained using the annotation method shown, and the units for the basic parameters listed in Table 9 are all millimeters (mm).

[0104] Example / parameter D1s D2s d3s d3m D3s d0s d0m D0m EP01 CP1 EP12 EP23 CP3 L 3-1 2.28 3.16 2.38 2.30 3.90 1.46 4.74 6.50 0.31 0.02 0.41 0.31 0.02 2.38 3-2 2.15 3.06 2.18 2.14 3.97 1.36 4.84 6.93 0.26 0.02 0.43 0.29 0.01 2.36 3-3 2.38 3.56 2.32 2.28 4.20 1.56 4.94 6.67 0.31 0.02 0.47 0.29 0.01 2.46

[0105] Table 9

[0106] Figure 13AThe on-axis chromatic aberration curves of the optical imaging lenses 310, 320 and 330 of the third embodiment are shown, which represent the deflection of the focal point of light of different wavelengths after passing through the optical imaging lenses 310, 320 and 330. Figure 13B The astigmatism curves of the optical imaging lenses 310, 320 and 330 of the third embodiment are shown, which represent the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Figure 13C The distortion curves of the optical imaging lenses 310, 320 and 330 of the third embodiment are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 13D The magnification chromatic aberration curves of the optical imaging lenses 310, 320, and 330 of the third embodiment are shown, representing the deviations in image height at different points on the imaging plane after light passes through the lens. According to... Figures 13A to 13D It can be seen that the optical imaging lenses 310, 320 and 330 given in the third embodiment can achieve good imaging quality.

[0107] In summary, Table 10 shows the values ​​of the conditional expressions for each embodiment in the first to third embodiments.

[0108] Conditional expression / example 1-1 1-2 1-3 2-1 2-2 2-3 3-1 3-2 3-3 (d0m-d0s) / EP23 12.58 11.34 12.52 10.45 13.51 16.15 10.60 11.86 11.73 (d3s / CP3) / (R6-R5) x T23 19.99 15.09 19.19 8.42 6.66 11.29 18.58 31.24 33.20 |fmax| / EP12 20.89 22.21 21.62 58.55 54.89 64.25 22.03 20.91 19.00 D0m / L + |f2 / f3| 6.68 6.75 6.62 4.45 4.43 4.46 6.30 6.50 6.28 (CP1+EP12) / (CT1-T12) + |D3s / R6| 29.14 27.32 27.92 6.56 6.56 6.13 14.18 14.72 15.92 R6 / T34 + d3m / CT3 -5.97 -5.83 -6.17 2.64 2.22 1.85 -3.87 -4.20 -3.92 D1s / EP01 + D2s / CT1 17.51 18.53 16.66 16.31 17.06 14.98 17.39 17.97 18.98 f3 / R7 + d3m / (EP23+CP3) 11.12 10.50 10.36 12.57 13.07 13.66 10.80 10.87 11.44 R7 / R8 1.51 1.51 1.51 1.28 1.28 1.28 1.45 1.45 1.45 R4 / R5 -2.82 -2.82 -2.82 -2.15 -2.15 -2.15 -2.08 -2.08 -2.08

[0109] Table 10

[0110] This application also provides an imaging device, wherein the electronic photosensitive element can be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device can be a stand-alone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

[0111] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An optical imaging lens, characterized in that, include: A four-element lens group includes a first lens with positive optical power, a second lens with negative optical power, a third lens with positive optical power, and a fourth lens with negative optical power arranged sequentially along the optical axis from the object side to the image side. A group of spacers includes a first spacer, a second spacer, and a third spacer. The first spacer is positioned on the image-side surface of the first lens and is in contact with the image-side surface of the first lens. The second spacer is positioned on the image-side surface of the second lens and is in contact with the image-side surface of the second lens. The third spacer is positioned on the image-side surface of the third lens and is in contact with the image-side surface of the third lens. as well as The lens barrel, the four-element lens group, and the spacer element group are placed inside the lens barrel. The optical imaging lens contains four lenses with optical power. The inner diameter d0s of the object-side end face of the lens barrel, the inner diameter d0m of the image-side end face of the lens barrel, and the spacing EP23 of the second spacer element and the third spacer element along the optical axis satisfy: 10.45≤(d0m-d0s) / EP23≤16.15; Wherein, the maximum absolute value of the effective focal length of all lenses from the first lens to the fourth lens, |fmax|, satisfies the following condition with the spacing EP12 of the first and second spacers along the optical axis: 19.00≤|fmax| / EP12≤64.

25.

2. The optical imaging lens according to claim 1, characterized in that, The radius of curvature R6 of the image-side surface of the third lens, the air gap T34 between the third and fourth lenses on the optical axis, the center thickness CT3 of the third lens on the optical axis, and the inner diameter d3m of the image-side surface of the third spacer element satisfy: -6.17≤R6 / T34+d3m / CT3≤2.

64.

3. The optical imaging lens according to claim 1, characterized in that, The effective focal length f3 of the third lens, the radius of curvature R7 of the object side of the fourth lens, the inner diameter d3m of the image side of the third spacer, the spacing EP23 of the second and third spacers along the optical axis, and the maximum thickness CP3 of the third spacer satisfy: 10.36≤f3 / R7+d3m / (EP23+CP3)≤13.

66.

4. The optical imaging lens according to claim 1, characterized in that, The outer diameter D0m of the image-side end face of the lens barrel, the length L of the lens barrel in the direction of the optical axis, the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy: 4.43≤D0m / L+|f2 / f3|≤6.

75.

5. The optical imaging lens according to any one of claims 1-4, characterized in that, The maximum thickness CP1 of the first spacer element, the spacing EP12 between the first and second spacers along the optical axis, the center thickness CT1 of the first lens on the optical axis, the air gap T12 between the first and second lenses on the optical axis, the outer diameter D3s of the object side of the third spacer element, and the radius of curvature R6 of the image side of the third lens satisfy: 6.13≤(CP1+EP12) / (CT1-T12)+|D3s / R6|≤29.

14.

6. The optical imaging lens according to any one of claims 1-4, characterized in that, The outer diameter D1s of the object side of the first spacer element, the object side end face of the lens barrel and the spacing EP01 of the first spacer element along the optical axis, the outer diameter D2s of the object side of the second spacer element and the center thickness CT1 of the first lens on the optical axis satisfy: 14.98≤D1s / EP01+D2s / CT1≤18.

98.

7. The optical imaging lens according to any one of claims 1-4, characterized in that, The radius of curvature R5 of the object side of the third lens, the radius of curvature R6 of the image side of the third lens, the air gap T23 between the second lens and the third lens on the optical axis, the inner diameter d3s of the object side of the third spacer element and the maximum thickness CP3 of the third spacer element satisfy: 6.66≤(d3s / CP3) / (R6-R5)×T23≤33.

20.

8. The optical imaging lens according to any one of claims 1-4, characterized in that, The radius of curvature R7 of the object side of the fourth lens and the radius of curvature R8 of the image side of the fourth lens satisfy the following condition: 1.28≤R7 / R8≤1.

51.

9. The optical imaging lens according to any one of claims 1-4, characterized in that, The radius of curvature R4 of the image side of the second lens and the radius of curvature R5 of the object side of the third lens satisfy: -2.82≤R4 / R5≤-2.

08.

10. An optical imaging lens, characterized in that, include: A four-element lens group includes a first lens with positive optical power, a second lens with negative optical power, a third lens with positive optical power, and a fourth lens with negative optical power arranged sequentially along the optical axis from the object side to the image side. A group of spacers includes a first spacer, a second spacer, and a third spacer. The first spacer is positioned on the image-side surface of the first lens and is in contact with the image-side surface of the first lens. The second spacer is positioned on the image-side surface of the second lens and is in contact with the image-side surface of the second lens. The third spacer is positioned on the image-side surface of the third lens and is in contact with the image-side surface of the third lens. as well as The lens barrel, the four-element lens group, and the spacer element group are placed inside the lens barrel. The optical imaging lens contains four lenses with optical power. The radius of curvature R5 of the object side of the third lens, the radius of curvature R6 of the image side of the third lens, the air gap T23 between the second lens and the third lens on the optical axis, the inner diameter d3s of the object side of the third spacer element and the maximum thickness CP3 of the third spacer element satisfy: 6.66≤(d3s / CP3) / (R6-R5)×T23≤33.20; The maximum absolute value of the effective focal length of all lenses from the first lens to the fourth lens, |fmax|, satisfies the following condition with the spacing EP12 of the first and second spacers along the optical axis: 19.00≤|fmax| / EP12≤64.

25.

11. The optical imaging lens according to claim 10, characterized in that, The radius of curvature R4 of the image side of the second lens and the radius of curvature R5 of the object side of the third lens satisfy: -2.82≤R4 / R5≤-2.

08.

12. The optical imaging lens according to claim 11, characterized in that, The inner diameter d0s of the object-side end face of the lens barrel, the inner diameter d0m of the image-side end face of the lens barrel, and the spacing EP23 of the second spacer element and the third spacer element along the optical axis satisfy: 10.45≤(d0m-d0s) / EP23≤16.

15.

13. The optical imaging lens according to claim 10 or 11, characterized in that, The effective focal length f3 of the third lens, the radius of curvature R7 of the object side of the fourth lens, the inner diameter d3m of the image side of the third spacer, the spacing EP23 of the second and third spacers along the optical axis, and the maximum thickness CP3 of the third spacer satisfy: 10.36≤f3 / R7+d3m / (EP23+CP3)≤13.

66.

14. The optical imaging lens according to claim 10 or 11, characterized in that, The maximum thickness CP1 of the first spacer element, the spacing EP12 between the first and second spacers along the optical axis, the center thickness CT1 of the first lens on the optical axis, the air gap T12 between the first and second lenses on the optical axis, the outer diameter D3s of the object side of the third spacer element, and the radius of curvature R6 of the image side of the third lens satisfy: 6.13≤(CP1+EP12) / (CT1-T12)+|D3s / R6|≤29.

14.

15. The optical imaging lens according to claim 10 or 11, characterized in that, The outer diameter D1s of the object side of the first spacer element, the object side end face of the lens barrel and the spacing EP01 of the first spacer element along the optical axis, the outer diameter D2s of the object side of the second spacer element and the center thickness CT1 of the first lens on the optical axis satisfy: 14.98≤D1s / EP01+D2s / CT1≤18.

98.

16. The optical imaging lens according to claim 10 or 11, characterized in that, The outer diameter D0m of the image-side end face of the lens barrel, the length L of the lens barrel in the direction of the optical axis, the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy: 4.43≤D0m / L+|f2 / f3|≤6.

75.

17. The optical imaging lens according to claim 10 or 11, characterized in that, The radius of curvature R6 of the image-side surface of the third lens, the air gap T34 between the third and fourth lenses on the optical axis, the center thickness CT3 of the third lens on the optical axis, and the inner diameter d3m of the image-side surface of the third spacer element satisfy: -6.17≤R6 / T34+d3m / CT3≤2.

64.

18. The optical imaging lens according to claim 10 or 11, characterized in that, The radius of curvature R7 of the object side of the fourth lens and the radius of curvature R8 of the image side of the fourth lens satisfy the following condition: 1.28≤R7 / R8≤1.51.

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