Optical imaging lens

Abstract

The application discloses an optical imaging lens, which comprises: a lens group comprising, in sequence from an object side to an image side along an optical axis, a first lens, a second lens, a third lens and a fourth lens, wherein the first lens has positive refractive power; a plurality of spacer elements comprising at least four spacer elements; and a lens barrel for accommodating the lens group and the plurality of spacer elements, wherein a surface of at least one spacer element in the direction of the optical axis is in contact with an inner wall of the lens barrel; the height L of the lens barrel in the direction of the optical axis, the effective focal length f of the optical imaging lens, the outer diameter D0m of an image end face of the lens barrel close to the image side, the distance TD on the optical axis from the object side face of the first lens to the image side face of the fourth lens and the maximum half field of view Semi-FOV of the optical imaging lens satisfy: L / D0m+TD / [f*tan(Semi-FOV)]<1.5.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical elements, in particular to an optical imaging lens. BACKGROUND

[0002] The rapid development of the semiconductor industry promotes the rapid change of intelligent devices, and the progress of semiconductor technology rapidly improves the performance of electronic photosensitive elements. Therefore, the requirements of intelligent devices for camera lenses are also increasingly high. In order to make intelligent devices light, thin and portable, camera lenses need to develop towards the trend of ultra-thin. Ultra-thin can make camera lenses better compatible with intelligent devices, reduce the protrusion of the back camera, and make the appearance of the device more beautiful, which requires manufacturers to adopt more reasonable designs and more precise processes.

[0003] However, the lens barrel size limit usually exists in the ultra-thin and miniaturized lens, especially for the imaging lens with multiple pieces. It is difficult to design. When the total height of the imaging lens and the rear end structure design are unreasonable, the optical light transmission effect is not good, the space matching is not reasonable, the appearance is not beautiful, and other problems are prone to occur, thereby affecting the overall quality of the lens.

[0004] Therefore, how to make the optical imaging lens meet the ultra-thin and miniaturized condition while ensuring the rationality of the structure and improving the imaging quality is one of the key research topics of designers. SUMMARY

[0005] The present application provides an optical imaging lens, which includes: a lens group including, in order from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, and a fourth lens, wherein the first lens has a positive refractive power; a plurality of spacer elements including at least four spacer elements; and a lens barrel for accommodating the lens group and the plurality of spacer elements, wherein a surface of at least one spacer element in the direction of the optical axis is in contact with an inner wall of the lens barrel; the height L of the lens barrel in the direction of the optical axis, the effective focal length f of the optical imaging lens, the outer diameter D0m of the image end face of the lens barrel close to the image side, the distance TD on the optical axis from the object side face of the first lens to the image side face of the fourth lens, and the maximum half field angle Semi-FOV of the optical imaging lens satisfy: L / D0m+TD / [f×tan(Semi-FOV)]<1.5.

[0006] In an embodiment, the inner wall of the lens barrel has a plurality of stepped structures, and the stepped structure has a stepped surface perpendicular to the optical axis and an extension surface parallel to the optical axis.

[0007] In an embodiment, the curvature radius R3 of the object side face of the second lens and the curvature radius R4 of the image side face of the second lens satisfy: R4 / R3>0.

[0008] In one embodiment, the radius of curvature R7 of the object side surface of the fourth lens, the radius of curvature R8 of the image side surface of the fourth lens, and the effective focal length f4 of the fourth lens satisfy: 2.0 < f4 / (R7+R8) < 6.0.

[0009] In one embodiment, the radius of curvature R1 of the object side surface of the first lens, the radius of curvature R2 of the image side surface of the first lens, the outer diameter D0s of the object end surface of the lens barrel near the object side, and the inner diameter d0s of the object end surface of the lens barrel near the object side satisfy: 0 < (R2-R1) / (D0s-d0s) < 3.0.

[0010] In one embodiment, the plurality of spacer elements includes a first spacer element disposed on the image side surface of the first lens and at least partially in contact with the first lens, and a second spacer element disposed on the image side surface of the second lens and at least partially in contact with the second lens; wherein the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the inner diameter d1s of the object side surface of the first spacer element, the inner diameter d2s of the object side surface of the second spacer element, the maximum effective radius DT12 of the image side surface of the first lens, and the maximum effective radius DT21 of the object side surface of the second lens satisfy: -50.0 < (f1 / DT12+f2 / DT21) / (d2s-d1s) < 100.0.

[0011] In one embodiment, the plurality of spacer elements includes a third spacer element disposed on the image side surface of the third lens and at least partially in contact with the third lens; wherein the maximum outer diameter D3max of the third spacer element, the minimum inner diameter d3min of the third spacer element, and the central thickness CT3 of the third lens on the optical axis satisfy: 3.0 < (D3max-d3min) / CT3 < 10.0.

[0012] In one embodiment, the plurality of spacer elements includes a second spacer element disposed on the image side surface of the second lens and at least partially in contact with the second lens, and a third spacer element disposed on the image side surface of the third lens and at least partially in contact with the third lens; wherein the separation distance EP23 of the second spacer element and the third spacer element along the optical axis, the radius of curvature R5 of the object side surface of the third lens, and the radius of curvature R6 of the image side surface of the third lens satisfy: 5.0 < |(R5+R6)| / EP23 < 80.0.

[0013] In one embodiment, the portion of the inner wall of the lens barrel between the third lens and the fourth lens has two stepped surfaces.

[0014] In one embodiment, the number of spacer elements disposed between the third lens and the fourth lens is greater than or equal to 2.

[0015] In one embodiment, at least one of the spacer elements between the third lens and the fourth lens has an object side surface close to the object side, an image side surface close to the image side, an outer diameter surface parallel to the optical axis and in contact with the inner wall of the lens barrel, an inner diameter surface parallel to the optical axis and close to the optical axis, and at least one inclined surface at an angle to the optical axis, the inclined surface being connected to the outer diameter surface.

[0016] In one embodiment, the plurality of spacer elements includes a third spacer element disposed on the image side of the third lens and at least partially in contact with the third lens, and a first auxiliary spacer element disposed on the image side of the third spacer element and at least partially in contact with the third spacer element.

[0017] In one embodiment, the outer diameter D3bs of the object side surface of the first auxiliary spacer element, the inner diameter d3bs of the object side surface of the first auxiliary spacer element, the air separation T34 of the third lens and the fourth lens on the optical axis, the inner diameter d3m of the image side surface of the third spacer element, the outer diameter D3m of the image side surface of the third spacer element, and the center thickness CT3 of the third lens on the optical axis satisfy: 3.0 < (D3bs-d3bs) / T34 + (D3m-d3m) / CT3 < 10.0.

[0018] In one embodiment, the plurality of spacer elements includes a second auxiliary spacer element disposed on the image side of the first auxiliary spacer element and at least partially in contact with the first auxiliary spacer element.

[0019] 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 second lens; wherein the center thickness CT3 of the third lens on the optical axis, the center thickness CT4 of the fourth lens on the optical axis, the air separation T34 of the third lens and the fourth lens on the optical axis, the maximum thickness CP2 of the second spacer element in the direction of the optical axis, the maximum thickness CP3 of the third spacer element in the direction of the optical axis, and the maximum thickness CP3b of the first auxiliary spacer element in the direction of the optical axis satisfy: 1.0 < (CT3+T34+CT4) / (CP2+CP3+CP3b) < 6.0.

[0020] In an embodiment, the plurality of spacer elements comprises a first spacer element disposed on the image side of the first lens and in at least partial contact with the first lens, a second spacer element disposed on the image side of the second lens and in at least partial contact with the second lens, and a third spacer element disposed on the image side of the third lens and in at least partial contact with the third lens; wherein the distance between the first spacer element and the second spacer element along the optical axis EP12, the distance between the second spacer element and the third spacer element along the optical axis EP23, the maximum thickness of the third spacer element along the optical axis CP3, the combined focal length of the second lens and the third lens f23, and the effective focal length of the fourth lens f4 satisfy the following condition: -20.0 < 1 / [(EP12+EP23) / f23-CP3 / f4] < 0.

[0021] In an embodiment, the maximum outer diameter of the fourth lens D4, the radius of curvature of the object side surface of the fourth lens R7, the radius of curvature of the image side surface of the fourth lens R8, the central thickness of the fourth lens on the optical axis CT4, and the inner diameter of the image end surface of the barrel near the image side d0m satisfy the following condition: 1.0 < [D4 x (R7+R8)] / (CT4 x d0m) < 5.0.

[0022] In an embodiment, the plurality of spacer elements comprises a first spacer element disposed on the image side of the first lens and in at least partial contact with the first lens, the first lens and the second lens are in contact and separated by the first spacer element, and the first lens, the first spacer element, and the second lens are connected by a stacking mode.

[0023] In an embodiment, the plurality of spacer elements comprises a first spacer element disposed on the image side of the first lens and in at least partial contact with the first lens, the first lens and the second lens have a partial contact surface with a certain inclination angle to the optical axis, the first lens and the second lens are connected by a snap-fit mode, and the first spacer element is disposed on the side of the partial contact surface close to the optical axis.

[0024] In an embodiment, the plurality of spacer elements further comprises a fixing element disposed on the image side of the fourth lens, the fixing element comprises an outer diameter surface parallel to the optical axis, an object side surface close to the object side, and an image side surface close to the image side, the object side surface of the fixing element is in at least partial contact with the edge of the image side surface of the fourth lens, and the outer diameter surface of the fixing element is in at least partial contact with the inner wall of the barrel.

[0025] The optical imaging lens provided in the present application is composed of a plurality of lenses, a plurality of spacer elements, and a barrel. By controlling the optical power and surface shape of the first lens, the convergence of light rays in each field of view of the optical imaging lens is facilitated, and the aberration generated by the front end optics of the optical imaging lens is reduced. By controlling the size of the rear end of the optical imaging lens and the overall height of the barrel, the ultra-thin and small size characteristics of the lens are achieved, and the TD / f ratio is further controlled, thereby effectively ensuring the imaging quality. BRIEF DESCRIPTION OF DRAWINGS

[0026] Other features, objects, and advantages of the application will become more apparent from the following detailed description when read in connection with the following accompanying drawings:

[0027] FIG. 1 A structural arrangement diagram and a schematic diagram of partial parameters of an optical imaging lens according to the present application are shown;

[0028] FIG. 2A to FIG. 2C A structural schematic diagram of an optical imaging lens according to Embodiment 1 of the present application is shown;

[0029] FIG. 3A to FIG. 3D An on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of the optical imaging lens according to Embodiment 1 of the present application are respectively shown;

[0030] FIG. 4A to FIG. 4C A structural schematic diagram of an optical imaging lens according to Embodiment 2 of the present application is shown;

[0031] FIG. 5A to FIG. 5D An on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of the optical imaging lens according to Embodiment 2 of the present application are respectively shown;

[0032] FIG. 6A to FIG. 6C A structural schematic diagram of an optical imaging lens according to Embodiment 3 of the present application is shown; and

[0033] FIG. 7A to FIG. 7D An on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of the optical imaging lens according to Embodiment 3 of the present application are respectively shown. DETAILED DESCRIPTION

[0034] For a better understanding of the present application, various aspects of the present application will be described in more detail 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. The expression “and / or” includes any and all combinations of one or more of the associated listed items.

[0035] It should be noted that, in the present specification, the expressions first, second, third, etc. 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.

[0036] In the drawings, the thickness, size, and shape of the lenses have been exaggerated slightly 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.

[0037] In this document, the curvature or paraxial curvature refers to the curvature of a region near the optical axis. If the curvature of a lens surface is positive and the position of the curvature is not limited, it means that the curvature of the lens surface at least in the paraxial region is positive; if the curvature of a lens surface is negative and the position of the curvature is not limited, it means that the curvature of the lens surface at least in the paraxial region is negative. The surface of each lens close to the object is called the object side surface of the lens, and the surface of each lens close to the imaging surface is called the image side surface of the lens.

[0038] It should also be understood that the words "comprise", "comprising", "include", "including", and / or "contain", when used in this specification, mean that something comprises, includes or contains the stated features, elements and / or components, but does not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. Furthermore, when describing the embodiments of the present application, the use of "may" means "one or more embodiments of the present application". In addition, the word "exemplary" is intended to mean an example or an illustration.

[0039] 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.

[0040] 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 following embodiments only express several embodiments of the present application, which are described in detail and specifically, but should not be construed as limiting the scope of the patent of the present application. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection of the present application, for example, the lens group (i.e. the first lens to the fourth lens), the lens barrel and the spacer element in each embodiment of the present application can be combined arbitrarily, which is not limited to the combination of the lens group, the lens barrel, the spacer element, etc. in the embodiment.

[0041] The present application will be described in detail below with reference to the drawings and embodiments. Among them, FIG. 1 The structural arrangement diagram and the schematic diagram of some parameters of an optical imaging lens according to the present application are shown. It should be understood by those skilled in the art that some parameters of lenses commonly used in the art, such as the central thickness CT3 of the third lens on the optical axis, are not shown in the drawings, FIG. 1 , FIG. 1 Some parameters of the barrel and the spacer element of an optical imaging lens according to the present application are shown only exemplarily in order to better understand the present application, as shown in FIG. 1 ,

[0042] EP12 represents the spacing distance of the first spacer element and the second spacer element along the optical axis;

[0043] EP23 represents the spacing distance of the second spacer element and the third spacer element along the optical axis;

[0044] CP2 represents the maximum thickness of the second spacer element along the optical axis direction;

[0045] CP3 represents the maximum thickness of the third spacer element along the optical axis direction;

[0046] CP3b represents the maximum thickness of the first auxiliary spacer element along the optical axis direction;

[0047] L represents the height of the barrel along the optical axis direction (i.e. the distance along the optical axis from the object end surface of the barrel close to the object side to the image end surface of the barrel close to the image side);

[0048] D0s represents the outer diameter of the object end surface of the barrel close to the object side;

[0049] d0s represents the inner diameter of the object end surface of the barrel close to the object side;

[0050] d1s represents the inner diameter of the object side surface of the first spacer element;

[0051] d2s represents the inner diameter of the object side surface of the second spacer element;

[0052] D3m represents the outer diameter of the image side surface of the third spacer element;

[0053] d3m represents the inner diameter of the image side surface of the third spacer element;

[0054] D4 represents the maximum outer diameter of the fourth lens;

[0055] D0m represents the outer diameter of the image end surface of the barrel close to the image side;

[0056] d0m represents the inner diameter of the image end surface of the barrel close to the image side;

[0057] D3max represents the maximum outer diameter of the third spacer element;

[0058] d3min represents a minimum inner diameter of the third spacer element;

[0059] D3bs represents an outer diameter of the object side surface of the first auxiliary spacer element; and

[0060] d3bs represents an inner diameter of the object side surface of the first auxiliary spacer element.

[0061] The features, principles, and other aspects of the present application are described in detail below.

[0062] In an exemplary embodiment, an optical imaging lens according to the exemplary embodiments of the present application includes a lens barrel, and a plurality of lens groups and a plurality of spacer elements disposed in the lens barrel. The plurality of lens groups includes, in order from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, and a fourth lens. The plurality of spacer elements includes at least four spacer elements.

[0063] In an exemplary embodiment, the first lens has positive refractive power, and a curvature radius R1 of an object side surface of the first lens and a curvature radius R2 of an image side surface of the first lens satisfy R1 / R2>0. By controlling the refractive power and the curvature radius of the first lens, the convergence of light rays in each field of view of the optical imaging lens is facilitated, and the aberration generated by the front end optics of the optical imaging lens is reduced.

[0064] In an exemplary embodiment, the second lens has positive refractive power or negative refractive power, and the third lens has positive refractive power or negative refractive power.

[0065] In an exemplary embodiment, a curvature radius R3 of an object side surface of the second lens and a curvature radius R4 of an image side surface of the second lens satisfy R4 / R3>0. By reasonably configuring the curvature radii of the object side surface and the image side surface of the second lens, the degree of curvature of the surface of the second lens is controlled, and the amount of astigmatism generated by the front end optics and the rear end optics of the optical imaging lens is balanced.

[0066] In an exemplary embodiment, the fourth lens has positive refractive power, and a curvature radius R7 of an object side surface of the fourth lens and a curvature radius R8 of an image side surface of the fourth lens satisfy R7 / R8>0. By controlling the refractive power and the curvature radius of the fourth lens, the degree of curvature of the surface of the fourth lens is controlled, and the amount of astigmatism generated by the front end optics and the rear end optics of the optical imaging lens is balanced.

[0067] In the example embodiments, the radius of curvature R7 of the object side surface of the fourth lens, the radius of curvature R8 of the image side surface of the fourth lens and the effective focal length f4 of the fourth lens satisfy: 2.0 < f4 / (R7+R8) < 6.0, more specifically, f4, R7 and R8 further satisfy: 2.1 < f4 / (R7+R8) < 5.1. Satisfying 2.0 < f4 / (R7+R8) < 6.0, by controlling the refractive power and the radius of curvature of the fourth lens, the aberration of the front end optics of the optical imaging lens is compensated, so that the optical imaging lens has good imaging quality.

[0068] In the example embodiments, each of the plurality of spacing elements comprises at least one surface in the direction of the optical axis, and the at least one surface in the direction of the optical axis of the spacing element is in contact with the inner wall of the lens barrel.

[0069] In the example embodiments, the inner wall of the lens barrel has a plurality of stepped structures, and the stepped structure has a stepped surface perpendicular to the optical axis and an extension surface parallel to the optical axis. The stepped structure of the inner wall of the lens barrel cooperates with the internal lens and the spacing element structure to provide auxiliary abutment, and the extension surface parallel to the optical axis cooperates with the outer diameter of the lens to facilitate lens assembly and ensure lens coaxiality, thereby realizing stable assembly of the lens and ensuring optical performance of the lens under the condition of ultra-thin structure. The design of the lens barrel cooperates with the module assembly to meet the ultra-thin requirement and ensure the beauty of the lens.

[0070] In the example embodiments, the part of the inner wall of the lens barrel between the third lens and the fourth lens has two stepped surfaces. The light path between the third lens and the fourth lens is relatively steep, and the effective diameters of the two are relatively different. In order to effectively support between the two, two stepped surfaces are arranged in the lens barrel, which can provide auxiliary abutment for the spacing element and ensure the uniformity of the wall thickness of the lens barrel, thereby improving the assembly stability and reducing the molding risk of the lens barrel.

[0071] In the example embodiments, the number of spacing elements placed between the third lens and the fourth lens is greater than or equal to 2. The lens barrel is provided with two stepped surfaces between the third lens and the fourth lens, and the use of multiple spacing elements can make each spacing element regular in shape and meet the design standard in structure, thereby facilitating the processing and molding of the spacing element and avoiding additional costs caused by special structure. In addition, the multiple spacing elements can facilitate the adjustment of the thickness, improve the performance of the field curvature, effectively block stray light and improve the imaging quality of the lens.

[0072] In the example embodiments, the plurality of spacing elements comprises: a first spacing element, a second spacing element, a third spacing element and an auxiliary spacing element, wherein the first spacing element is arranged on the image side of the first lens and at least partially contacts the first lens; the second spacing element is arranged on the image side of the second lens and at least partially contacts the second lens; and the third spacing element is arranged on the image side of the third lens and at least partially contacts the third lens.

[0073] In the example embodiment, the auxiliary spacer element includes a first auxiliary spacer element disposed on the image side of the third spacer element and at least partially in contact with the third spacer element. The auxiliary spacer element is provided to facilitate the structural rationality requirement. The object side of the first auxiliary spacer element is in contact with the image side of the third spacer element, and the object side of the third spacer element is in contact with the image side of the third lens. The greater the overlapping area of the two contact regions in the direction perpendicular to the optical axis, the more stable the structure is. In addition, the outer diameter of the first auxiliary spacer element is matched with the interior of the lens barrel, thereby ensuring the coaxiality of the spacer element.

[0074] In the example embodiment, the auxiliary spacer element further includes a second auxiliary spacer element disposed on the image side of the first auxiliary spacer element and at least partially in contact with the first auxiliary spacer element. The auxiliary spacer element is provided to facilitate the structural rationality requirement. The object side of the second auxiliary spacer element is in contact with the image side of the first auxiliary spacer element, and the image side of the second auxiliary spacer element is in contact with the object side of the fourth lens. The greater the overlapping area of the two contact regions in the direction perpendicular to the optical axis, the more stable the structure is. In addition, the inner diameter of the second auxiliary spacer element is close to the optical outer diameter of the object side of the fourth lens, thereby effectively blocking stray light.

[0075] In the example embodiment, at least one of the spacer elements between the third lens and the fourth lens has an object side close to the object side, an image side close to the image side, an outer diameter surface parallel to the optical axis and in contact with the inner wall of the lens barrel, an inner diameter surface parallel to the optical axis and close to the optical axis, and at least one inclined surface at an angle to the optical axis, the inclined surface being connected to the outer diameter surface. The object side close to the object side of the spacer element is in contact with the image side of the third lens, and the image side close to the image side is in contact with the object side of the fourth lens, thereby ensuring the spacing of the third lens and the fourth lens in the direction of the optical axis. The outer diameter surface parallel to the optical axis and in contact with the inner wall of the lens barrel ensures the cooperation between the spacer element and the lens barrel, thereby preventing the lens and the spacer element from being deflected. The inner diameter surface parallel to the optical axis and close to the optical axis is close to the optical outer diameter of the image side of the third lens, thereby improving the light blocking effect at this position. The outermost side of the inclined surface avoids the effective light path, thereby avoiding blocking the effective light. The above conditions work together to improve the assembly stability of the lens and ensure the optical performance of the lens.

[0076] In exemplary embodiments, the optical imaging lens according to the present application can satisfy: L / D0m+TD / [fxtan(Semi-FOV)]<1.5, where L is the height of the lens barrel along the optical axis, f is the effective focal length of the optical imaging lens, D0mis the outer diameter of the image end surface of the lens barrel close to the image side, TD is the distance on the optical axis from the object side surface of the first lens to the image side surface of the fourth lens, Semi-FOV is the maximum half field of view angle of the optical imaging lens. More specifically, L, D0m, TD, f and Semi-FOV can further satisfy: L / D0m+TD / [fxtan(Semi-FOV)]<1.35. Satisfying L / D0m+TD / [fxtan(Semi-FOV)]<1.5, by controlling the size of the rear end of the optical imaging lens and the overall height of the lens barrel, it is helpful to realize the ultra-thin and small size characteristics of the lens, and at the same time it is helpful to further control the TD / f ratio, which can effectively ensure the imaging quality. In addition, it is beneficial to ensure that the lens meets the normal shooting requirements, and the incident light corresponding to the maximum field of view angle of the lens cannot be blocked by the lens barrel.

[0077] In exemplary embodiments, the optical imaging lens according to the present application can satisfy: 0<(R2-R1) / (D0s-d0s)<3.0, where R1 is the curvature radius of the object side surface of the first lens, R2 is the curvature radius of the image side surface of the first lens, D0s is the outer diameter of the object end surface of the lens barrel close to the object side, d0s is the inner diameter of the object end surface of the lens barrel close to the object side. More specifically, R2, R1, D0s and d0s can further satisfy: 1.1<(R2-R1) / (D0s-d0s)<2.6. The curvature radii of the object side surface and the image side surface of the first lens determine the surface trend of the first lens, and also affect the outer diameter of the first lens. Satisfying 0<(R2-R1) / (D0s-d0s)<3.0 can adjust and control the contact length of the first lens with the lens barrel and the thickness of the head of the lens barrel, reduce the risk of lens barrel forming, and improve the assembly stability of the lens under the condition of ensuring the integrity of light passing.

[0078] In exemplary embodiments, the optical imaging lens according to the present application can satisfy: -50.0 < (f1 / DT12 + f2 / DT21) / (d2s-d1s) < 100.0, where f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, d1s is the inner diameter of the object side surface of the first spacer element, d2s is the inner diameter of the object side surface of the second spacer element, DT12 is the maximum effective radius of the image side surface of the first lens, and DT21 is the maximum effective radius of the object side surface of the second lens. More specifically, f1, DT12, f2, DT21, d2s and d1s can further satisfy: -22.6 < (f1 / DT12 + f2 / DT21) / (d2s-d1s) < 87.4. Satisfying -50.0 < (f1 / DT12 + f2 / DT21) / (d2s-d1s) < 100.0, by controlling the effective focal length and the maximum effective radius of the image side surface of the first lens, the angle and range of the light exiting the first lens are controlled, by controlling the effective focal length and the maximum effective radius of the image side surface of the second lens, the angle and range of the light entering the second lens are controlled, thereby achieving precise control of the light path between the first lens and the second lens, and effectively blocking stray light by the inner diameter structure of the first spacer element and the second spacer element, improving imaging quality, and meeting the design requirements of optical parameters in limited space.

[0079] In exemplary embodiments, the optical imaging lens according to the present application can satisfy: 3.0 < (D3max-d3min) / CT3 < 10.0, where D3max is the maximum outer diameter of the third spacer element, d3min is the minimum inner diameter of the third spacer element, and CT3 is the center thickness of the third lens on the optical axis. More specifically, D3max, d3min and CT3 can further satisfy: 4.2 < (D3max-d3min) / CT3 < 6.8. The inner and outer diameters of the third spacer element can affect the contact area of the third lens and the third spacer element, so satisfying 3.0 < (D3max-d3min) / CT3 < 10.0 helps to control the stability of the abutting position of the third spacer element and the third lens, thereby ensuring the stability of the overall structure.

[0080] In exemplary embodiments, the optical imaging lens according to the present application can satisfy: 5.0 < |(R5+R6)| / EP23< 80.0, where EP23 is the interval distance of the second spacer element and the third spacer element along the optical axis, R5 is the curvature radius of the object side surface of the third lens, and R6 is the curvature radius of the image side surface of the third lens. More specifically, R5, R6 and EP23 can further satisfy: 10.0 < |(R5+R6)| / EP23< 78.0. The curvature radius R5 of the object side surface and the curvature radius R6 of the image side surface of the third lens affect the overall shape of the third lens, so that 5.0 < |(R5+R6)| / EP23< 80.0 is satisfied, the edge thickness of the third lens can be adjusted by adjusting the interval between the second spacer element and the third spacer element, the third lens surface trend is ensured to be gentle, the thickness is uniform, and the risk of lens injection welding marks is reduced.

[0081] In exemplary embodiments, the optical imaging lens according to the present application can satisfy: 3.0 < (D3bs-d3bs) / T34+(D3m-d3m) / CT3< 10.0, where D3bs is the outer diameter of the object side surface of the first auxiliary spacer element, d3bs is the inner diameter of the object side surface of the first auxiliary spacer element, T34 is the air interval of the third lens and the fourth lens on the optical axis, d3m is the inner diameter of the image side surface of the third spacer element, D3m is the outer diameter of the image side surface of the third spacer element, and CT3 is the center thickness of the third lens on the optical axis. More specifically, D3bs, d3bs, T34, D3m, d3m and CT3 can further satisfy: 4.7 < (D3bs-d3bs) / T34+(D3m-d3m) / CT3< 8.9. The inner and outer diameters of the object side surface of the first auxiliary spacer element and the inner and outer diameters of the image side surface of the third spacer element determine the contact area of the third spacer element and the first auxiliary spacer element, and 3.0 < (D3bs-d3bs) / T34+(D3m-d3m) / CT3< 10.0 is satisfied, which can effectively improve the assembly stability by controlling the position and size of the contact area of the third spacer element and the first auxiliary spacer element; reasonable control of the center thickness of the third lens on the optical axis can ensure good machining feasibility of the lens, and control of the air gap between the third lens and the fourth lens can effectively ensure the accuracy of the positions of the two lenses after assembly, so that the optical parameters of the lens meet the design requirements, while preventing the lens and the lens effective diameter surface from interfering with each other on the optical axis, thereby improving the appearance and performance yield.

[0082] In exemplary embodiments, the optical imaging lens according to the present application can satisfy: 1.0 < (CT3+T34+CT4) / (CP2+CP3+CP3b) < 6.0, where CT3 is the center thickness of the third lens on the optical axis, CT4 is the center thickness of the fourth lens on the optical axis, T34 is the air gap between the third lens and the fourth lens on the optical axis, CP2 is the maximum thickness of the second spacer element along the optical axis, CP3 is the maximum thickness of the third spacer element along the optical axis, and CP3b is the maximum thickness of the first auxiliary spacer element along the optical axis. More specifically, CT3, T34, CT4, CP2, CP3 and CP3b can further satisfy: 2.4 < (CT3+T34+CT4) / (CP2+CP3+CP3b) < 4.8. Satisfying 1.0 < (CT3+T34+CT4) / (CP2+CP3+CP3b) < 6.0, by adjusting the thicknesses of the second spacer element, the third spacer element and the first auxiliary spacer element to control the edge thickness of the third lens, while controlling the center thicknesses of the third lens and the fourth lens on the optical axis and the air gap therebetween, the lens can be guaranteed to have good processing feasibility, so that the optical parameters of the lens meet the design requirements.

[0083] In exemplary embodiments, the optical imaging lens according to the present application can satisfy: -20.0 < 1 / [(EP12+EP23) / f23-CP3 / f4] < 0, where EP12 is the separation distance between the first spacer element and the second spacer element along the optical axis, EP23 is the separation distance between the second spacer element and the third spacer element along the optical axis, CP3 is the maximum thickness of the third spacer element along the optical axis, f23 is the combined focal length of the second lens and the third lens, and f4 is the effective focal length of the fourth lens. More specifically, EP12, EP23, f23, CP3 and f4 can further satisfy: -11.4 < 1 / [(EP12+EP23) / f23-CP3 / f4] < -6.4. Satisfying -20.0 < 1 / [(EP12+EP23) / f23-CP3 / f4] < 0, by controlling the separation of the first spacer element, the second spacer element and the third spacer element along the optical axis to adjust the relative positions of the second lens, the third lens and the fourth lens, and effectively supporting the lenses to increase the assembly stability. In addition, by adjusting the combined focal length of the second lens and the third lens and the effective focal length of the fourth lens, the lens can obtain a large enough image surface in a thin structure, and the imaging clarity is improved.

[0084] In the example embodiments, the optical imaging lens according to the present application can satisfy: 1.0 < [D4 x (R7 + R8)] / (CT4 x d0m) < 5.0, where D4 is the maximum outer diameter of the fourth lens, R7 is the curvature radius of the object side surface of the fourth lens, R8 is the curvature radius of the image side surface of the fourth lens, CT4 is the central thickness of the fourth lens on the optical axis, and d0m is the inner diameter of the image end surface of the lens barrel close to the image side. More specifically, D4, R7, R8, CT4 and d0m can further satisfy: 2.6 < [D4 x (R7 + R8)] / (CT4 x d0m) < 3.2. The fourth lens is the lens with the largest outer diameter in the 4-piece ultra-thin lens, and has a higher risk of molding and a higher risk of stray light generation. Satisfying 1.0 < [D4 x (R7 + R8)] / (CT4 x d0m) < 5.0 can effectively control the surface shape of the fourth lens, ensure that the surface shape curve of the image side surface is gentle, and the sol wavefront curve is relatively gentle during injection molding, without converging wrapping phenomenon, thereby reducing the risk of weld marks and the risk of stray light and appearance problems at the weld marks. At the same time, the inner diameter of the image end surface of the lens barrel closest to the image side is controlled to ensure that the inner wall of the lens barrel does not block the outermost effective optical and does not produce stray light directly reflected to the image surface, thereby improving the imaging quality.

[0085] In the example embodiments, the plurality of spacing elements include a first spacing element disposed on the image side surface of the first lens and at least partially in contact with the first lens, the first lens and the second lens are spaced apart without contact and through the first spacing element, and the first lens, the first spacing element and the second lens are connected in a stacking manner. Connecting the first lens and the second lens in a stacking manner can improve the reliability of the lens, and is conducive to the lens being subjected to low-temperature storage, high-temperature and high-humidity tests and drop tests. Under the interference of external extreme conditions, the performance change difference of the lens is small, which can make the lens meet more extensive use conditions and make the application scenarios of the ultra-thin lens more abundant.

[0086] In the example embodiments, the plurality of spacing elements include a first spacing element disposed on the image side surface of the first lens and at least partially in contact with the first lens, the first lens and the second lens have a partial contact surface with a certain inclination angle to the optical axis, the first lens and the second lens are connected in a snap-fit manner, and the first spacing element is disposed on the side of the partial contact surface close to the optical axis. Connecting the first lens and the second lens in a snap-fit manner can improve the optical performance of the lens. The snap-fit connection makes the relative position of the first lens and the second lens more accurate, ensures the concentricity and coaxiality between the two, meets the design requirements of the optical parameters, and improves the imaging quality of the lens. In addition, the snap-fit structure is more stable, which is conducive to improving the assembly stability.

[0087] In the example embodiment, the plurality of spacer elements of the optical imaging lens further comprises a fixed element disposed on the image side of the fourth lens, the fixed element comprising an outer diameter surface parallel to the optical axis, an object side surface close to the object side, and an image side surface close to the image side, the object side surface of the fixed element at least partially contacts the edge of the image side of the fourth lens, and the outer diameter surface of the fixed element at least partially contacts the inner wall of the lens barrel. The image side surface of the fixed element and the gap with the inner wall of the lens barrel are filled with glue, the structure of which makes the load borne by the glue all or most of the shear load, and secondly the tensile load, while increasing the bonding area and improving the load bearing capacity of the glue. The fixed element makes the lens group structure more stable, increases the push-off force of the lens, makes the risk of lens falling failure lower, and ensures the quality of the lens.

[0088] In the example embodiment, the effective focal length f of the optical imaging lens can be, for example, in the range of 2.6mm to 2.7mm, the effective focal length f1 of the first lens can be, for example, in the range of 2.6mm to 3.0mm, the effective focal length f2 of the second lens can be, for example, in the range of -8.3mm to 6.8mm, the effective focal length f3 of the third lens can be, for example, in the range of -55.1mm to 50.0mm, and the effective focal length f4 of the fourth lens can be, for example, in the range of 4.1mm to 7.9mm. The optical imaging lens according to the present application can have a smaller total optical length in the case of having a large image surface, for example, the total optical length TTL of the optical imaging lens can satisfy 3.1mm < TTL < 3.3mm.

[0089] In the example embodiment, the total optical length TTL of the optical imaging lens and the effective focal length f of the optical imaging lens satisfy: 0.4 < TTL / f < 1.30, which reasonably controls the ratio of TTL and f of the optical imaging lens, and is beneficial to maintaining the miniaturization feature of the optical imaging lens.

[0090] In the embodiment of the present application, at least one of the lens surfaces of each lens is a non-spherical lens surface, that is, at least one of the object side surface of the first lens to the image side surface of the fourth lens is a non-spherical lens surface. The characteristic of the non-spherical lens is that the curvature is continuously changed 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, and has the advantages of improving the distortion aberration and improving the astigmatism aberration. After adopting 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 surface and the image side surface of all the lenses from the first lens to the fourth lens are non-spherical lens surfaces.

[0091] In the example embodiment, the optical imaging lens described above can further comprise a filter for correcting color deviation and / or a protective glass for protecting the photosensitive elements located on the imaging surface.

[0092] The optical imaging lens according to the above-mentioned embodiments of the present application can adopt multiple lenses, for example, four lenses as mentioned above. By reasonably allocating the optical power, surface shape of each lens, and arrangement of each spacer element, etc., the span of each focal length of the lens and the barrel is relatively uniform, which enhances the ability of light convergence and improves the imaging quality of the ultra-thin and large image surface imaging lens.

[0093] However, those skilled in the art should understand that the number of lenses 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. For example, although four lenses are described in the embodiments, the optical imaging lens is not limited to including four lenses. If necessary, the optical imaging lens can also include other numbers of lenses.

[0094] The specific embodiments of the optical imaging lens applicable to the above-mentioned embodiments are further described below with reference to the accompanying drawings.

[0095] Embodiment 1

[0096] The following refers to FIG. 2A to FIG. 3D The optical imaging lens 1001, the optical imaging lens 1002, and the optical imaging lens 1003 according to Embodiment 1 of the present application are described. FIG. 2A to FIG. 2C The structural schematic diagrams of the optical imaging lens 1001, the optical imaging lens 1002, and the optical imaging lens 1003 according to Embodiment 1 of the present application are respectively shown.

[0097] As FIG. 2A to FIG. 2C shown, the optical imaging lens 1001, the optical imaging lens 1002, and the optical imaging lens 1003 each include a barrel P0, lens groups E1-E4, and multiple spacer elements P1-P3b.

[0098] As FIG. 2A to FIG. 2C shown, the optical imaging lens 1001, the optical imaging lens 1002, and the optical imaging lens 1003 adopt the same lens group, which 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. Among them, the first lens E1 has positive optical power, the second lens E2 has negative optical power, the third lens E3 has negative optical power, the fourth lens E4 has positive optical power, and the optical filter (not shown) has an object side surface S9 (not shown) and an image side surface S10 (not shown). The light from the object passes through each surface S1-S10 in order and is finally imaged on the imaging surface (not shown).

[0099] Table 1 shows a basic parameter table of the lens groups of the optical imaging lens 1001, the optical imaging lens 1002 and the optical imaging lens 1003 of Example 1, wherein the units of the radius of curvature, the thickness and the effective focal length are all millimeters (mm).

[0100]

[0101] Table 1

[0102] In the present example, the effective focal length f of the optical imaging lens 1001, the optical imaging lens 1002 and the optical imaging lens 1003 is 2.62 mm, and the maximum half field angle Semi-FOV of the optical imaging lens 1001, the optical imaging lens 1002 and the optical imaging lens 1003 is 43.0°.

[0103] In Example 1, the object side and the image side of any one of the first lens E1 to the fourth lens E4 are aspherical surfaces, and the surface type x of each aspherical lens can be defined by, but not limited to, the following aspherical surface formula:

[0104]

[0105] wherein x is the sag of the aspherical surface at a position along the optical axis direction at a height of h, from the vertex of the aspherical surface; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the inverse of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspherical surface. Table 2-1 and Table 2-2 give the high-order coefficients A4, A6, A8, A10 and A12 that can be used for each aspherical mirror surface S1-S8 in Example 1. 10 12 14 16 18 20 22 24 26 .

[0106] Face No. A4 A6 A8 A10 A12 A14 S1 2.4426E-03 3.9592E-04 -2.4164E-04 6.9875E-06 -4.8762E-05 7.0762E-06 S2 2.1740E-03 -4.1052E-03 -8.5301E-04 -2.4186E-04 -6.1436E-05 -3.1432E-05 S3 -4.3205E-02 -2.1382E-03 8.5749E-04 -2.1926E-04 -9.8501E-06 -5.1635E-05 S4 -4.8780E-02 4.6789E-03 6.0804E-03 7.8865E-04 3.0677E-04 8.6585E-05 S5 -2.9427E-02 -6.1862E-03 7.1941E-04 1.1647E-03 -5.2642E-04 5.3460E-04 S6 -1.2359E-01 5.4411E-02 -2.5039E-02 7.9400E-03 -2.6290E-03 1.4404E-03 S7 -1.7046E+00 4.4527E-01 -9.9781E-02 1.1835E-02 -3.6153E-03 4.5322E-03 S8 -2.3364E+00 2.9003E-01 -5.0973E-02 2.7919E-02 -5.6844E-03 -1.5411E-03

[0107] Table 2-1

[0108] Face No. A16 A18 A20 A22 A24 A26 S1 -1.2020E-05 2.5421E-06 -3.4944E-06 0.0000E+00 0.0000E+00 0.0000E+00 S2 -5.0755E-06 4.1749E-07 4.1164E-06 0.0000E+00 0.0000E+00 0.0000E+00 S3 -1.3655E-05 -1.1407E-05 -6.0214E-06 0.0000E+00 0.0000E+00 0.0000E+00 S4 3.4943E-05 1.1237E-05 -5.7724E-06 -7.1929E-06 -4.5256E-06 0.0000E+00 S5 -5.1766E-05 4.2572E-05 -3.7218E-05 0.0000E+00 0.0000E+00 0.0000E+00 S6 -3.5918E-04 7.6993E-05 -6.7737E-05 4.5586E-05 0.0000E+00 0.0000E+00 S7 -2.1367E-03 2.8735E-04 -9.5428E-06 1.9438E-04 -1.1062E-04 0.0000E+00 S8 -1.7077E-03 -3.3761E-04 5.7744E-04 2.3050E-04 1.5552E-04 -8.1385E-05

[0109] Table 2-2

[0110] As FIG. 2A to FIG. 2C ​​​​​​​​As shown, optical imaging lenses 1001, 1002, and 1003 each include four spacer elements. These four spacer elements are a first spacer element P1, a second spacer element P2, a third spacer element P3, and a first auxiliary spacer element P3b. The first spacer element P1 is located on the image-side of the first lens E1 and is at least partially in contact with the first lens E1; the second spacer element P2 is located on the image-side of the second lens E2 and is at least partially in contact with the second lens E2; the third spacer element P3 is located on the image-side of the third lens E3 and is at least partially in contact with the third lens E3; and the first auxiliary spacer element P3b is located on the image-side of the third spacer element P3 and is at least partially in contact with the third spacer element P3.

[0111] like FIG. 2A to FIG. 2C As shown, the third spacer element P3 has an object-side surface near the object side, an image-side surface near the image side, an outer diameter surface parallel to the optical axis and in contact with the inner wall of the lens barrel, an inner diameter surface parallel to and close to the optical axis, and at least one oblique contact surface at a certain angle to the optical axis, the oblique contact surface being connected to the outer diameter surface. FIG. 2B As shown, the spacer element of the optical imaging lens 1002 also includes a fixing element P4 placed on the image-side surface of the fourth lens E4. The fixing element P4 includes an outer diameter surface parallel to the optical axis, an object-side surface near the object side, and an image-side surface near the image side. The object-side surface of the fixing element P4 is at least partially in contact with the edge of the image-side surface of the fourth lens E4, and the outer diameter surface of the fixing element P4 is at least partially in contact with the inner wall of the lens barrel P0. The aforementioned spacer element can block excess external light from entering, allowing the lens and lens barrel to better support each other, and enhancing the structural stability of the optical imaging lenses 1001, 1002, and 1003.

[0112] like FIG. 2A and FIG. 2B As shown, the first lens E1 and the second lens E2 are not in contact and are separated by the first spacer element P1. The first lens E1, the first spacer element P1, and the second lens E2 are connected in a stacked manner. FIG. 2C As shown, the first lens E1 and the second lens E2 have partial contact surfaces that are tilted at a certain angle to the optical axis. The first lens E1 and the second lens E2 are connected by a snap-fit ​​method, and the first spacer element P1 is placed on the side of the partial contact surface close to the optical axis.

[0113] Table 3 shows the basic parameters of the spacer elements and lens barrels of the optical imaging lenses 1001, 1002 and 1003 of Embodiment 1. The unit of each parameter in Table 3 is millimeters (mm).

[0114] Parameter / Optical Imaging Lens Optical imaging lens 1001 Optical imaging lens 1002 Optical imaging lens 1003 d1s 1.1611 1.1810 1.2335 d2s 1.5143 1.5035 1.5873 d3m 3.4745 3.4745 3.4503 D3m 3.7636 3.7436 3.8366 d0s 1.5686 1.5781 1.5642 d0m 5.2320 5.7392 5.2055 D0s 2.4598 2.6070 2.6024 D0m 5.7882 7.0615 5.6125 EP12 0.3746 0.3746 0.3894 CP2 0.0180 0.0200 0.0180 EP23 0.3422 0.3402 0.3425 CP3 0.2044 0.2044 0.1894 L 2.2646 2.4143 2.3000 d3bs 3.0659 3.0821 3.1388 D3bs 4.1853 4.2453 4.2582 CP3b 0.0180 0.0180 0.0180 D3max 3.8072 3.7872 3.8801 d3min 2.5084 2.5184 2.5691 D4 4.1853 4.2453 4.2582

[0115] Table 3

[0116] FIG. 3A On-axis chromatic aberration curves of the optical imaging lens 1001, the optical imaging lens 1002 and the optical imaging lens 1003 of Embodiment 1 are shown, which represent the deviation of convergent focal points of light rays of different wavelengths after passing through the lens. FIG. 3B Astigmatism curves of the optical imaging lens 1001, the optical imaging lens 1002 and the optical imaging lens 1003 of Embodiment 1 are shown, which represent the meridional image curvature and sagittal image curvature. FIG. 3C Distortion curves of the optical imaging lens 1001, the optical imaging lens 1002 and the optical imaging lens 1003 of Embodiment 1 are shown, which represent the distortion size values corresponding to different image heights. FIG. 3D Magnification chromatic aberration curves of the optical imaging lens 1001, the optical imaging lens 1002 and the optical imaging lens 1003 of Embodiment 1 are shown, which represent the deviation of light rays on the imaging plane at different image heights after passing through the lens. According to FIG. 3A to FIG. 3D It can be seen that the optical imaging lens 1001, the optical imaging lens 1002 and the optical imaging lens 1003 given by Embodiment 1 can achieve good imaging quality.

[0117] Embodiment 2

[0118] The following refers to FIG. 4A to FIG. 5D Optical imaging lens 2001, optical imaging lens 2002 and optical imaging lens 2003 according to Embodiment 2 of the present application are described. In this embodiment and the following embodiments, part of the description similar to Embodiment 1 will be omitted for brevity. FIG. 4A to FIG. 4C Structure schematic diagrams of optical imaging lens 2001, optical imaging lens 2002 and optical imaging lens 2003 according to Embodiment 2 of the present application are shown respectively.

[0119] As shown in FIG. 4A to FIG. 4C Optical imaging lens 2001, optical imaging lens 2002 and optical imaging lens 2003 each include a lens barrel P0, lens groups E1-E4 and a plurality of spacer elements P1-P3c.

[0120] As shown in FIG. 4A to FIG. 4C Optical imaging lens 2001, optical imaging lens 2002 and optical imaging lens 2003 adopt the same lens group, which 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. The first lens E1 has positive refractive power, the second lens E2 has positive refractive power, the third lens E3 has negative refractive power, the fourth lens E4 has positive refractive power, and the optical filter (not shown) has an object side surface S9 (not shown) and an image side surface S10 (not shown). Light from the object passes through each surface S1-S10 in order and is finally imaged on the imaging plane (not shown).

[0121] In the present example, the effective focal length f of the optical imaging lens 2001, the optical imaging lens 2002 and the optical imaging lens 2003 is 2.62 mm, and the maximum half field angle Semi-FOV of the optical imaging lens 2001, the optical imaging lens 2002 and the optical imaging lens 2003 is 43.05°.

[0122] Table 4 shows the basic parameter table of the lens groups of the optical imaging lens 2001, the optical imaging lens 2002 and the optical imaging lens 2003 of Example 2, wherein the units of the radius of curvature, the thickness and the effective focal length are all millimeters (mm). Table 5-1 and Table 5-2 show the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20 and A22 of the aspherical surfaces S1-S8 that can be used in the optical imaging lens 2001, the optical imaging lens 2002 and the optical imaging lens 2003 of Example 2, wherein each aspherical surface type can be defined by the formula (1) given in the above Example 1. 10 12 14 16 18 20 22 24 26 28 30 and A22, wherein each aspherical surface type can be defined by the formula (1) given in the above Example 1.

[0123]

[0124]

[0125] Table 4

[0126] Face No. A4 A6 A8 A10 A12 A14 A16 S1 5.8641E-03 1.9352E-04 -2.3692E-04 -1.8141E-05 -2.8134E-05 -2.3431E-08 -1.0360E-05 S2 -4.5025E-03 -3.8940E-03 -7.3310E-04 -1.4775E-04 -2.2745E-05 1.0230E-05 1.6433E-06 S3 -4.1365E-02 -5.0153E-03 -5.0740E-04 -7.5016E-05 -5.4934E-06 -6.9007E-07 9.9964E-06 S4 -6.8297E-02 8.4932E-03 2.4067E-03 7.0510E-05 -1.6120E-04 8.0624E-05 9.2982E-05 S5 -6.1791E-02 2.0874E-02 -4.1560E-03 -2.2504E-03 -1.1730E-03 -1.9990E-04 -1.8238E-04 S6 -1.9381E-01 9.6878E-02 -2.9452E-02 1.6721E-03 -3.8591E-04 1.1873E-03 -4.4595E-04 S7 -2.1350E+00 5.9345E-01 -1.8092E-01 4.8143E-02 -1.4161E-02 8.9380E-03 -4.9561E-03 S8 -2.2278E+00 3.1954E-01 -6.6783E-02 3.7835E-02 -1.0697E-02 2.6483E-04 -1.3579E-03

[0127] Table 5-1

[0128] Face No. A18 A20 A22 A24 A26 A28 A30 S1 -3.3474E-06 -2.5609E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 -1.1765E-06 -3.1298E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 2.3796E-06 4.2003E-07 1.6162E-06 3.7293E-06 3.4477E-06 1.9709E-06 -1.7611E-06 S4 3.8613E-05 2.1711E-05 -2.8393E-07 6.7325E-06 -3.3630E-06 -3.0267E-06 -7.0536E-06 S5 -8.8355E-05 -5.3138E-05 -1.6590E-05 -3.9367E-06 3.0033E-06 2.2353E-06 5.2899E-06 S6 5.3675E-05 -2.1716E-05 3.0273E-05 -4.0865E-06 2.0203E-06 1.2805E-06 -5.0550E-06 S7 1.8121E-03 -2.1456E-04 7.1230E-05 -2.7642E-04 2.1771E-04 -7.5797E-05 -1.6769E-06 S8 6.3829E-04 9.2289E-04 4.3034E-04 3.6398E-04 -9.3207E-06 6.5401E-05 -2.7241E-05

[0129] Table 5-2

[0130] As FIG. 4A to FIG. 4C ​​​​​​​​​​As shown, optical imaging lenses 2001, 2002, and 2003 each include five spacer elements. These five spacer elements are a first spacer element P1, a second spacer element P2, a third spacer element P3, a first auxiliary spacer element P3b, and a second auxiliary spacer element P3c. The first spacer element P1 is located on the image-side of the first lens E1 and is at least partially in contact with the first lens E1; the second spacer element P2 is located on the image-side of the second lens E2 and is at least partially in contact with the second lens E2; the third spacer element P3 is located on the image-side of the third lens E3 and is at least partially in contact with the third lens E3; the first auxiliary spacer element P3b is located on the image-side of the third spacer element P3 and is at least partially in contact with the third spacer element P3; and the second auxiliary spacer element P3c is located on the image-side of the first auxiliary spacer element P3b and is at least partially in contact with the first auxiliary spacer element P3b.

[0131] like FIG. 4A to FIG. 4C As shown, the first auxiliary spacer element P3b has an object-side surface near the object side, an image-side surface near the image side, an outer diameter surface parallel to the optical axis and in contact with the inner wall of the lens barrel, an inner diameter surface parallel to and close to the optical axis, and at least one oblique contact surface at a certain angle to the optical axis, the oblique contact surface being connected to the outer diameter surface. FIG. 4B As shown, the spacer element of the optical imaging lens 2002 also includes a fixing element P4 placed on the image-side surface of the fourth lens E4. The fixing element P4 includes an outer diameter surface parallel to the optical axis, an object-side surface near the object side, and an image-side surface near the image side. The object-side surface of the fixing element P4 is at least partially in contact with the edge of the image-side surface of the fourth lens E4, and the outer diameter surface of the fixing element P4 is at least partially in contact with the inner wall of the lens barrel P0. The aforementioned spacer element can block excess external light from entering, allowing the lens and lens barrel to better support each other, and enhancing the structural stability of the optical imaging lenses 2001, 2002, and 2003.

[0132] like FIG. 4A and FIG. 4B As shown, the first lens E1 and the second lens E2 are not in contact and are separated by the first spacer element P1. The first lens E1, the first spacer element P1, and the second lens E2 are connected in a stacked manner. FIG. 4C As shown, the first lens E1 and the second lens E2 have partial contact surfaces that are tilted at a certain angle to the optical axis. The first lens E1 and the second lens E2 are connected by a snap-fit ​​method, and the first spacer element P1 is placed on the side of the partial contact surface close to the optical axis.

[0133] Table 6 shows the basic parameters of the spacer elements and lens barrels of optical imaging lenses 2001, 2002 and 2003 in Embodiment 2. The unit of each parameter in Table 6 is millimeters (mm).

[0134] Parameter / Optical Imaging Lens Optical imaging lens 2001 Optical imaging lens 2002 Optical imaging lens 2003 d1s 1.0184 0.9978 1.0185 d2s 1.2331 1.2387 1.2312 d3m 1.9012 1.8912 1.8653 D3m 4.1019 4.0519 4.0660 d0s 1.5748 1.5377 1.7058 d0m 5.1248 5.4696 5.2905 D0s 2.1616 2.1245 2.8921 D0m 5.6810 7.1756 5.7705 EP12 0.2555 0.2355 0.2555 CP2 0.0180 0.0180 0.0200 EP23 0.3422 0.3422 0.3402 CP3 0.0180 0.0180 0.0160 L 2.3919 2.3000 2.2678 d3bs 2.3564 2.3464 2.3770 D3bs 2.8180 2.8080 2.8386 CP3b 0.2644 0.2624 0.2664 D3max 4.1019 4.0519 4.0660 d3min 1.9012 1.8912 1.8653 D4 4.4557 4.4700 4.4434

[0135] Table 6

[0136] FIG. 5A On-axis chromatic aberration curves of the optical imaging lens 2001, the optical imaging lens 2002 and the optical imaging lens 2003 of Embodiment 2 are shown, which represent the convergence point deviation of light rays of different wavelengths after passing through the lens. FIG. 5B Astigmatism curves of the optical imaging lens 2001, the optical imaging lens 2002 and the optical imaging lens 2003 of Embodiment 2 are shown, which represent the meridional image surface curvature and sagittal image surface curvature. FIG. 5C Distortion curves of the optical imaging lens 2001, the optical imaging lens 2002 and the optical imaging lens 2003 of Embodiment 2 are shown, which represent the distortion size values corresponding to different image heights. FIG. 5D Lateral chromatic aberration curves of the optical imaging lens 2001, the optical imaging lens 2002 and the optical imaging lens 2003 of Embodiment 2 are shown, which represent the deviation of light rays on the imaging surface at different image heights after passing through the lens. According to the FIG. 5A to FIG. 5D It can be known that the optical imaging lens 2001, the optical imaging lens 2002 and the optical imaging lens 2003 given by Embodiment 2 can achieve good imaging quality.

[0137] Embodiment 3

[0138] The following refers to FIG. 6A to FIG. 7D The optical imaging lens 3001, the optical imaging lens 3002 and the optical imaging lens 3003 according to Embodiment 3 of the present application are described. FIG. 6A to FIG. 6C The structural schematic diagrams of the optical imaging lens 3001, the optical imaging lens 3002 and the optical imaging lens 3003 according to Embodiment 3 of the present application are respectively shown.

[0139] As shown in FIG. 6A to FIG. 6C The optical imaging lens 3001, the optical imaging lens 3002 and the optical imaging lens 3003 each respectively include a lens barrel P0, lens groups E1-E4 and a plurality of spacer elements P1-P3b.

[0140] As shown in FIG. 6A to FIG. 6CAs shown, optical imaging lenses 3001, 3002, and 3003 employ the same lens group, which, from the object side to the image side, sequentially includes: a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4. The first lens E1 has positive optical power, the second lens E2 has negative optical power, the third lens E3 has positive optical power, and the fourth lens E4 has positive optical power. A filter (not shown) 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 ultimately imaged onto the imaging surface (not shown).

[0141] In this example, the effective focal length f of optical imaging lenses 2001, 2002 and 2003 is 2.62 mm, and the maximum semi-FOV of optical imaging lenses 2001, 2002 and 2003 is 43.0°.

[0142] Table 7 shows the basic parameters of the lens groups of optical imaging lenses 3001, 3002, and 3003 in Embodiment 3, wherein the units for radius of curvature, thickness, and effective focal length are millimeters (mm). Tables 8-1 and 8-2 show the higher-order coefficients A4, A6, A8, and A6 that can be used for each aspherical mirror S1-S8 in Embodiment 3. 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 and A 30 Each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0143]

[0144] Table 7

[0145]

[0146]

[0147] Table 8-1

[0148] Face No. A18 A20 A22 A24 A26 A28 A30 S1 -8.1835E-06 1.9633E-06 -2.6610E-06 0.0000E+00 0.0000E+00 0.0000E+00 -8.1835E-06 S2 -7.8436E-06 3.2346E-06 2.5789E-06 0.0000E+00 0.0000E+00 0.0000E+00 -7.8436E-06 S3 -3.4518E-05 -1.2528E-05 -1.2448E-05 0.0000E+00 0.0000E+00 0.0000E+00 -3.4518E-05 S4 -7.2070E-07 2.0854E-05 -8.1187E-06 -4.1675E-06 -8.1195E-06 0.0000E+00 -7.2070E-07 S5 -8.1330E-05 4.5920E-05 -2.5875E-05 0.0000E+00 0.0000E+00 0.0000E+00 -8.1330E-05 S6 -7.8957E-04 3.1199E-04 -4.9887E-05 3.8213E-05 0.0000E+00 0.0000E+00 -7.8957E-04 S7 -2.7405E-03 1.6474E-03 -6.9533E-04 1.2210E-04 -2.5620E-05 0.0000E+00 -2.7405E-03 S8 -3.5938E-03 2.8708E-05 -1.5572E-04 2.8601E-06 3.5876E-05 -7.7724E-05 -3.5938E-03

[0149] Table 8-2

[0150] like FIG. 6A to FIG. 6CAs shown in FIG. 3, the optical imaging lens 3001, the optical imaging lens 3002 and the optical imaging lens 3003 each include five spacer elements, which are a first spacer element P1, a second spacer element P2, a third auxiliary spacer element P2b, a third spacer element P3 and a first auxiliary spacer element P3b, respectively. The first spacer element P1 is disposed on the image side of the first lens E1 and at least partially contacts the first lens E1. The second spacer element P2 is disposed on the image side of the second lens E2 and at least partially contacts the second lens E2. The third auxiliary spacer element P2b is disposed on the image side of the second spacer element P2 and at least partially contacts the second spacer element P2. The third spacer element P3 is disposed on the image side of the third lens E3 and at least partially contacts the third lens E3. The first auxiliary spacer element P3b is disposed on the image side of the third spacer element P3 and at least partially contacts the third spacer element P3.

[0151] As shown in FIG. 3, FIG. 6A to FIG. 6C As shown in FIG. 3, the second spacer element P2 and the third spacer element P3 each have an object side surface close to the object side, an image side surface close to the image side, an outer diameter surface parallel to the optical axis and contacting the inner wall of the lens barrel, an inner diameter surface parallel to the optical axis and close to the optical axis, and at least one inclined surface with a certain inclination angle with respect to the optical axis, and the inclined surface is connected to the outer diameter surface. FIG. 6B As shown in FIG. 3, the spacer element of the optical imaging lens 3002 further includes a fixing element P4 disposed on the image side of the fourth lens E4. The fixing element P4 includes an outer diameter surface parallel to the optical axis, an object side surface close to the object side, and an image side surface close to the image side. The object side surface of the fixing element P4 at least partially contacts the edge of the image side of the fourth lens E4, and the outer diameter surface of the fixing element P4 at least partially contacts the inner wall of the lens barrel P0. The above spacer elements can block the entry of external excess light, make the lens and the lens barrel better abut, and enhance the structural stability of the optical imaging lens 3001, the optical imaging lens 3002 and the optical imaging lens 3003.

[0152] As shown in FIG. 3, FIG. 6A and FIG. 6B The first lens E1 and the second lens E2 are in contact and separated by the first spacer element P1, and the first lens E1, the first spacer element P1 and the second lens E2 are connected by stacking. FIG. 6C As shown in FIG. 3, the first lens E1 and the second lens E2 have a partial contact surface with a certain inclination angle with respect to the optical axis, and the first lens E1 and the second lens E2 are connected by snap fitting, and the first spacer element P1 is disposed on the side of the partial contact surface close to the optical axis.

[0153] Table 9 shows the basic parameters of the spacer elements and the lens barrel of the optical imaging lens 3001, the optical imaging lens 3002 and the optical imaging lens 3003 of Example 3. The units of the parameters in Table 9 are millimeters (mm).

[0154] Parameter / Optical Imaging Lens Optical imaging lens 3001 Optical imaging lens 3002 Optical imaging lens 3003 d1s 1.1592 1.1660 1.1566 d2s 1.7458 1.7363 1.7670 d3m 3.6088 3.6088 3.6300 D3m 3.9477 3.9206 3.9689 d0s 1.5246 1.5658 1.5689 d0m 5.2210 5.4466 5.1537 D0s 2.1300 2.1325 2.7552 D0m 5.6810 7.1526 5.6337 EP12 0.3646 0.3446 0.3646 CP2 0.1605 0.1585 0.1685 EP23 0.2771 0.2791 0.2742 CP3 0.2211 0.2111 0.2261 L 2.2370 2.2775 2.3000 d3bs 3.2327 3.2626 3.2540 D3bs 4.5140 4.4470 4.5013 CP3b 0.0180 0.0180 0.0180 D3max 4.1019 4.1019 4.1231 d3min 2.7310 2.7310 2.7310 D4 4.5140 4.4470 4.5013

[0155] Table 9

[0156] FIG. 7A On-axis chromatic aberration curves of the optical imaging lenses 3001, 3002 and 3003 of Embodiment 3 are shown, which represent the deviation of light rays of different wavelengths from the converging focal point after passing through the lenses. FIG. 7B Astigmatism curves of the optical imaging lenses 3001, 3002 and 3003 of Embodiment 3 are shown, which represent the meridional image curvature and sagittal image curvature. FIG. 7C Distortion curves of the optical imaging lenses 3001, 3002 and 3003 of Embodiment 3 are shown, which represent the distortion size values corresponding to different image heights. FIG. 7D Lateral chromatic aberration curves of the optical imaging lenses 3001, 3002 and 3003 of Embodiment 3 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 FIG. 7A to FIG. 7D It can be known that the optical imaging lenses 3001, 3002 and 3003 given by Embodiment 3 can achieve good imaging quality.

[0157] In summary, the optical imaging lenses 1001, 1002, 1003, 2001, 2002, 2003, 3001, 3002 and 3003 of Embodiments 1 to 3 satisfy the relationships shown in Table 10.

[0158]

[0159]

[0160] Table 10

[0161] The present application also provides an imaging device, the electronic photosensitive element of which can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor device (CMOS). The imaging device can be a standalone imaging apparatus such as a digital camera, or an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

[0162] The above description is only the preferred embodiment of the present application and the explanation of the technical principles. It should be understood by those skilled in the art that the scope of the disclosure of the present application is not limited to the technical scheme composed of the specific combination of the above technical features, and should also cover other technical schemes formed by the combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical scheme formed by replacing the above features with the technical features disclosed in the present application (but not limited to) having similar functions.

Claims

1. An optical imaging lens, characterized in that, include: The lens group, along the optical axis from the object side to the image side, includes, in sequence, a first lens, a second lens, a third lens, and a fourth lens, wherein the first lens and the fourth lens both have positive optical power, at least one of the second lens and the third lens has negative optical power, the object side of the first lens is convex and the image side is concave, the object side of the second lens is concave and the image side is convex, and the object side of the fourth lens is convex and the image side is concave. Multiple spacer elements, including at least four spacer elements; and A lens barrel for accommodating the lens group and the plurality of spacer elements, wherein at least one surface of the spacer element along the optical axis is in contact with the inner wall of the lens barrel; The optical imaging lens has four lenses with optical power. The height L of the lens barrel along the optical axis, the effective focal length f of the optical imaging lens, the outer diameter D0m of the image end face of the lens barrel near the image side, the distance TD from the object side of the first lens to the image side of the fourth lens on the optical axis, and the maximum half field of view (Semi-FOV) of the optical imaging lens satisfy: 1.18≤L / D0m+TD / [f×tan(Semi-FOV)]≤1.

30.

2. The optical imaging lens according to claim 1, characterized in that, The inner wall of the lens barrel has multiple stepped structures, each having a stepped surface perpendicular to the optical axis and an extended surface parallel to the optical axis.

3. The optical imaging lens according to claim 1, characterized in that, The radius of curvature R3 of the object side of the second lens and the radius of curvature R4 of the image side of the second lens satisfy: R4 / R3>0.

4. The optical imaging lens according to claim 1, characterized in that, The radius of curvature R7 of the object-side surface of the fourth lens, the radius of curvature R8 of the image-side surface of the fourth lens, and the effective focal length f4 of the fourth lens satisfy: 2.1 <f4 / (R7+R8)≤5.02。 5. The optical imaging lens according to any one of claims 1 to 4, characterized in that, The radius of curvature R1 of the object side of the first lens, the radius of curvature R2 of the image side of the first lens, the outer diameter D0s of the object end face of the lens barrel near the object side, and the inner diameter d0s of the object end face of the lens barrel near the object side satisfy: 1.1 < (R2-R1) / (D0s-d0s) ≤ 2.

51.

6. The optical imaging lens according to any one of claims 1 to 4, characterized in that, The plurality of spacer elements includes a first spacer element disposed on the image-side surface of the first lens and in at least partial contact with the first lens, and a second spacer element disposed on the image-side surface of the second lens and in at least partial contact with the second lens; wherein... The effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the inner diameter d1s of the object-side surface of the first spacer element, the inner diameter d2s of the object-side surface of the second spacer element, the maximum effective radius DT12 of the image-side surface of the first lens, and the maximum effective radius DT21 of the object-side surface of the second lens satisfy: -22.6 mm -1 <(f1 / DT12+f2 / DT21) / (d2s-d1s)≤87.33mm -1 .

7. The optical imaging lens according to any one of claims 1 to 4, characterized in that, The plurality of spacer elements includes a third spacer element disposed on the image-side surface of the third lens and in at least partial contact with the third lens; wherein, The maximum outer diameter D3max of the third spacer element, the minimum inner diameter d3min of the third spacer element, and the center thickness CT3 of the third lens on the optical axis satisfy the following condition: 4.28≤(D3max-d3min) / CT3<6.

8.

8. The optical imaging lens according to any one of claims 1 to 4, wherein the plurality of spacer elements includes a second spacer element disposed on the image-side surface of the second lens and in at least partial contact with the second lens, and a third spacer element disposed on the image-side surface of the third lens and in at least partial contact with the third lens; wherein, The distance EP23 between the second spacer element and the third spacer element along the optical axis, the radius of curvature R5 of the object side of the third lens and the radius of curvature R6 of the image side of the third lens satisfy: 10.41≤|(R5+R6)| / EP23≤77.

95.

9. The optical imaging lens according to claim 2, characterized in that, The inner wall of the lens barrel, located between the third lens and the fourth lens, has two stepped surfaces.

10. The optical imaging lens according to claim 9, characterized in that, The number of spacer elements placed between the third lens and the fourth lens is greater than or equal to 2.

11. The optical imaging lens according to claim 1, characterized in that, In the spacer element between the third lens and the fourth lens, at least one spacer element has an object side surface near the object side, an image side surface near the image side, an outer diameter surface parallel to the optical axis and in contact with the inner wall of the lens barrel, an inner diameter surface parallel to the optical axis and close to the optical axis, and at least one oblique contact surface at a certain angle to the optical axis, the oblique contact surface being connected to the outer diameter surface.

12. The optical imaging lens according to claim 1, characterized in that, The plurality of spacers includes a third spacer element disposed on the image-side side of the third lens and in at least partial contact with the third lens, and a first auxiliary spacer element disposed on the image-side side of the third spacer element and in at least partial contact with the third spacer element.

13. The optical imaging lens according to claim 12, characterized in that, The outer diameter D3bs of the object side of the first auxiliary spacer element, the inner diameter d3bs of the object side of the first auxiliary spacer element, the air gap T34 between the third lens and the fourth lens on the optical axis, the inner diameter d3m of the image side of the third spacer element, the outer diameter D3m of the image side of the third spacer element, and the center thickness CT3 of the third lens on the optical axis satisfy: 4.78≤(D3bs-d3bs) / T34+(D3m-d3m) / CT3≤8.

83.

14. The optical imaging lens according to claim 12, characterized in that, The plurality of spacers includes a second auxiliary spacer element positioned on the image side of the first auxiliary spacer element and in at least partial contact with the first auxiliary spacer element.

15. The optical imaging lens according to claim 12, characterized in that, The plurality of spacer elements further includes a second spacer element disposed on the image-side surface of the second lens and in at least partial contact with the second lens; wherein, The center thickness CT3 of the third lens on the optical axis, the center thickness CT4 of the fourth lens on the optical axis, the air gap T34 between the third and fourth lenses on the optical axis, the maximum thickness CP2 of the second spacer element along the optical axis, the maximum thickness CP3 of the third spacer element along the optical axis, and the maximum thickness CP3b of the first auxiliary spacer element along the optical axis satisfy: 2.4 < (CT3 + T34 + CT4) / (CP2 + CP3 + CP3b) ≤ 4.

74.

16. The optical imaging lens according to any one of claims 1, 9 to 15, characterized in that, The plurality of spacer elements includes a first spacer element disposed on the image-side surface of the first lens and in at least partial contact with the first lens, a second spacer element disposed on the image-side surface of the second lens and in at least partial contact with the second lens, and a third spacer element disposed on the image-side surface of the third lens and in at least partial contact with the third lens; wherein, The spacing EP12 between the first and second spacers along the optical axis, the spacing EP23 between the second and third spacers along the optical axis, the maximum thickness CP3 of the third spacer along the optical axis, the combined focal length f23 of the second and third lenses, and the effective focal length f4 of the fourth lens satisfy: -11.4 < 1 / [(EP12+EP23) / f23-CP3 / f4] ≤ -6.

49.

17. The optical imaging lens according to any one of claims 1, 9 to 15, characterized in that, The maximum outer diameter D4 of the fourth lens, the radius of curvature R7 of the object side surface of the fourth lens, the radius of curvature R8 of the image side surface of the fourth lens, the center thickness CT4 of the fourth lens on the optical axis, and the inner diameter d0m of the image end face of the lens barrel near the image side satisfy: 2.69≤[D4×(R7+R8)] / (CT4×d0m)<3.

2.

18. The optical imaging lens according to any one of claims 1, 9 to 15, characterized in that, The plurality of spacers includes a first spacer element placed on the image side of the first lens and in at least partial contact with the first lens, the first lens and the second lens not in contact and separated by the first spacer element, and the first lens, the first spacer element and the second lens being connected in a stacked manner.

19. The optical imaging lens according to any one of claims 1, 9 to 15, characterized in that, The plurality of spacers includes a first spacer element placed on the image side of the first lens and in at least partial contact with the first lens. The first lens and the second lens have partial contact surfaces that are at a certain angle to the optical axis. The first lens and the second lens are connected by a snap-fitting method. The first spacer element is placed on the side of the partial contact surface close to the optical axis.

20. The optical imaging lens according to any one of claims 1, 9 to 15, characterized in that, The plurality of spacers also include a fixing element disposed on the image side of the fourth lens. The fixing element includes an outer diameter surface parallel to the optical axis, an object side surface near the object side, and an image side surface near the image side. The object side surface of the fixing element is at least partially in contact with the edge of the image side surface of the fourth lens, and the outer diameter surface of the fixing element is at least partially in contact with the inner wall of the lens barrel.

Images