Optical imaging lens

Abstract

The utility model provides an optical imaging lens. The optical imaging lens comprises a lens barrel, a lens group and at least one spacer, the lens group and the spacer are arranged in the lens barrel, the lens group is composed of four lenses, and the four lenses are sequentially a first lens, a second lens, a third lens and a fourth lens from the object side to the image side; the at least one spacer comprises a first spacer; the refractive index N1 of the first lens, the curvature radius R1 of the object side surface of the first lens and the inner diameter d1s of the object side surface of the first spacer meet the following condition:-5.09 < = R1 * N1 / d1s < =-2.32; the curvature radius R2 of the image side face of the first lens, the inner diameter d1s of the object side face of the first spacer and the outer diameter D1s of the object side face of the first spacer meet the condition that R2 / (D1s-d1s) is larger than or equal to 0.55 and smaller than or equal to 1.42. According to the utility model, the problem that a four-piece optical imaging lens in the prior art is poor in front-end assembly stability due to the fact that a large field angle is met is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical imaging equipment technical field, specifically, relate to an optical imaging lens. BACKGROUND

[0002] In the modern electronic product, especially the rapid development background of smart phone and portable equipment, the design and performance requirement of optical imaging lens is increasingly improved. Especially in VR, AR and other products, through eyeball tracking to obtain eyeball movement and other key information, optical imaging lens has become an indispensable part.

[0003] Under such technical background, four-piece optical imaging lens is widely used because of its few lens pieces and simple structure. However, the four-piece optical imaging lens in the prior art usually needs to constrain the optical parameters of the first lens when pursuing large field angle, but in this case, it is difficult to control the stability of the front end lens, thereby affecting the assembly stability of the front end structure and the performance stability of the optical imaging lens.

[0004] That is, the four-piece optical imaging lens in the prior art has the problem of poor front end assembly stability caused by meeting large field angle. UTILITY MODEL CONTENTS

[0005] The main purpose of the utility model is to provide an optical imaging lens to solve the problem of poor front end assembly stability caused by meeting large field angle in the four-piece optical imaging lens in the prior art.

[0006] In order to achieve the above purpose, according to one aspect of the utility model, an optical imaging lens is provided, which comprises a lens barrel, a lens group and at least one spacer arranged in the lens barrel, the lens group is composed of four lenses, and the four lenses are sequentially arranged from the object side to the image side as the first lens, the second lens, the third lens and the fourth lens; the at least one spacer comprises a first spacer arranged between the first lens and the second lens and in contact with the image side surface of the first lens; wherein the refractive index N1 of the first lens, the curvature radius R1 of the object side surface of the first lens and the inner diameter d1s of the object side surface of the first spacer satisfy: -5.09≤R1×N1 / d1s≤-2.32; the curvature radius R2 of the image side surface of the first lens, the inner diameter d1s of the object side surface of the first spacer and the outer diameter D1s of the object side surface of the first spacer satisfy: 0.55≤R2 / (D1s-d1s)≤1.42.

[0007] According to another aspect of the utility model, provide a kind of optical imaging lens, including lens barrel and the lens group and at least one spacer being arranged in lens barrel, lens group is made of four lenses, four lenses are sequentially from object side to image side as the first lens with negative optical power, the second lens with positive optical power, the third lens with positive optical power and the fourth lens with optical power;The object side surface of first lens is concave, and the image side surface is concave;The object side surface of second lens is concave, and the image side surface is convex;The object side surface of third lens is concave, and the image side surface is convex;The object side surface of fourth lens is concave, and the image side surface is convex;At least one spacer includes the first spacer between first lens and second lens and with the image side surface part of first lens contact, the second spacer between second lens and third lens and with the image side surface part of second lens contact;Wherein, the refractive index N1 of first lens, the curvature radius R1 of the object side surface of first lens and the inner diameter d1s between the object side surface of first spacer satisfy:-5.09≤R1×N1 / d1s≤-2.32;The effective focal length f1 of first lens, the central thickness CT1 of first lens on optical axis and the axial interval EP01 between the object side end surface of lens barrel to first spacer satisfy:-2.18≤f1 / (EP01+CT1)≤-1.25.

[0008] According to another aspect of the utility model, provide a kind of optical imaging lens, including lens barrel and the lens group and at least one spacer being arranged in lens barrel, lens group is made of four lenses, four lenses are sequentially from object side to image side as the first lens with negative optical power, the second lens with positive optical power, the third lens with positive optical power and the fourth lens with optical power;The object side surface of first lens is concave, and the image side surface is concave;The object side surface of second lens is concave, and the image side surface is convex;The object side surface of third lens is concave, and the image side surface is convex;The object side surface of fourth lens is concave, and the image side surface is convex;At least one spacer includes the first spacer between first lens and second lens and with the image side surface part of first lens contact, the second spacer between second lens and third lens and with the image side surface part of second lens contact, the third spacer between third lens and fourth lens and with the image side surface part of third lens contact;The effective focal length f1 of first lens and the inner diameter d1s between the object side surface of first spacer satisfy:-2.17≤f1 / d1s≤-0.89;The outer diameter D3s of the object side surface of third spacer and the inner diameter d3s between the object side surface of third spacer satisfy:1.44≤D3s / d3s≤3.30.

[0009] Further, the effective focal length f1 of first lens, the central thickness CT1 of first lens on optical axis and the axial interval EP01 between the object side end surface of lens barrel to first spacer satisfy:-2.18≤f1 / (EP01+CT1)≤-1.25.

[0010] Further, the maximum axial thickness CP1 of the first spacer, the central thickness CT2 of the second lens on the optical axis, and the air interval T12 of the first lens and the second lens on the optical axis satisfy: 0.67 ≤ (T12 + CP1) / CT2 ≤ 4.78.

[0011] Further, the at least one spacer further includes a second spacer disposed between the second lens and the third lens and in contact with the image side surface portion of the second lens, and the effective focal length f2 of the second lens and the axial interval EP12 between the first spacer and the second spacer satisfy: 1.41 ≤ f2 / EP12 ≤ 4.90.

[0012] Further, the at least one spacer further includes a second spacer disposed between the second lens and the third lens and in contact with the image side surface portion of the second lens, and the outer diameter D2s of the object side surface of the second spacer and the radius of curvature R4 of the image side surface of the second lens satisfy: -5.40 ≤ D2s / R4 ≤ -3.81.

[0013] Further, the at least one spacer further includes a second spacer disposed between the second lens and the third lens and in contact with the image side surface portion of the second lens, and the air interval T23 of the second lens and the third lens on the optical axis and the maximum axial thickness CP2 of the second spacer satisfy: 0.21 ≤ T23 / CP2 ≤ 2.73.

[0014] Further, the at least one spacer further includes a third spacer disposed between the third lens and the fourth lens and in contact with the image side surface portion of the third lens, and the radius of curvature R6 of the image side surface of the third lens, the outer diameter D3s of the object side surface of the third spacer, and the inner diameter d3s of the object side surface of the third spacer satisfy: -1.37 ≤ R6 / (D3s - d3s) ≤ -0.27.

[0015] Further, the at least one spacer further includes a second spacer disposed between the second lens and the third lens and in contact with the image side surface portion of the second lens, and a third spacer disposed between the third lens and the fourth lens and in contact with the image side surface portion of the third lens, and the central thickness CT3 of the third lens on the optical axis and the axial interval EP23 between the second spacer and the third spacer satisfy: 0.87 ≤ CT3 / EP23 ≤ 1.82.

[0016] Further, the at least one spacer further includes a third spacer disposed between the third lens and the fourth lens and in contact with the image side surface portion of the third lens, and the radius of curvature R7 of the object side surface of the fourth lens, the refractive index N4 of the fourth lens, and the outer diameter D3m of the image side surface of the third spacer satisfy: -1.29 ≤ R7 × N4 / D3m ≤ -0.47.

[0017] Further, a radius of curvature R8 of an image side surface of the fourth lens and an inner diameter d0m of the image side end surface of the lens barrel satisfy: -1.50 <= R8 / d0m <= -0.62.

[0018] Further, a maximum axial height L of the lens barrel and a sum ∑AT of air intervals on the optical axis between adjacent lenses among the first to fourth lenses satisfy: 2.19 <= L / ∑AT <= 5.54.

[0019] Further, the first lens has a negative refractive power, the second lens has a positive refractive power, and the third lens has a positive refractive power; and / or, the object side surface of the first lens is a concave surface, and the image side surface is a concave surface; the object side surface of the second lens is a concave surface, and the image side surface is a convex surface; the object side surface of the third lens is a concave surface, and the image side surface is a convex surface; and the object side surface of the fourth lens is a concave surface, and the image side surface is a convex surface.

[0020] The optical imaging lens comprises a lens barrel and a lens set and at least one spacer arranged in the lens barrel, the lens set is composed of four lenses, the four lenses are sequentially the first lens, the second lens, the third lens and the fourth lens from the object side to the image side; the at least one spacer comprises a first spacer arranged between the first lens and the second lens and partially in contact with the image side surface of the first lens; wherein the refractive index N1 of the first lens, the radius of curvature R1 of the object side surface of the first lens and the inner diameter d1s of the object side surface of the first spacer satisfy: -5.09 <= R1*N1 / d1s <= -2.32; the radius of curvature R2 of the image side surface of the first lens, the inner diameter d1s of the object side surface of the first spacer and the outer diameter D1s of the object side surface of the first spacer satisfy: 0.55 <= R2 / (D1s-d1s) <= 1.42.

[0021] The optical imaging lens of the present application is composed of a lens barrel and four lenses and at least one spacer arranged in the lens barrel, the positions of the four lenses and the first spacer are reasonably arranged, and the optical imaging lens satisfies: -5.09 <= R1*N1 / d1s <= -2.32, which guarantees the refractive index of the first lens and ensures that the optical imaging lens does not have light leakage problem while satisfying a large field angle. However, in this case, the first spacer is prone to bending, deviation and other situations after assembly, the assembly stability of the front end structure is poor, the optical imaging lens is prone to problems such as field curvature and dispersion. Therefore, the present application restricts 0.55 <= R2 / (D1s-d1s) <= 1.42, which guarantees the bending degree of the object side surface of the first lens, thereby guaranteeing the contact width of the first lens and the first spacer within a reasonable range, ensuring the assembly stability, avoiding the bending and deviation of the first spacer during assembly, and further ensuring the stability of the optical performance of the optical imaging lens. BRIEF DESCRIPTION OF DRAWINGS

[0022] The drawings accompanying the specification provide further understanding of the present application, serve as an example of the embodiments of the present application, and explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0023] Figure 1 A size annotation diagram of an optical imaging lens of an optional embodiment of the present application is shown;

[0024] Figure 2 A structure schematic diagram of an optical imaging lens of embodiment 1-1 of the present application is shown;

[0025] Figure 3 A structure schematic diagram of an optical imaging lens of embodiment 1-2 of the present application is shown;

[0026] Figures 4 to 7 An on-axis chromatic aberration curve, an astigmatism curve, a distortion curve and a magnification chromatic aberration curve of the optical imaging lens of embodiment one of the present application are shown respectively;

[0027] Figure 8 A structure schematic diagram of an optical imaging lens of embodiment 2-1 of the present application is shown;

[0028] Figure 9 A structure schematic diagram of an optical imaging lens of embodiment 2-2 of the present application is shown;

[0029] Figures 10 to 13 An on-axis chromatic aberration curve, an astigmatism curve, a distortion curve and a magnification chromatic aberration curve of the optical imaging lens of embodiment two of the present application are shown respectively;

[0030] Figure 14 A structure schematic diagram of an optical imaging lens of embodiment 3-1 of the present application is shown;

[0031] Figure 15 A structure schematic diagram of an optical imaging lens of embodiment 3-2 of the present application is shown;

[0032] Figures 16 to 19 An on-axis chromatic aberration curve, an astigmatism curve, a distortion curve and a magnification chromatic aberration curve of the optical imaging lens of embodiment three of the present application are shown respectively;

[0033] Figure 20 A structure schematic diagram of an optical imaging lens of embodiment 4-1 of the present application is shown;

[0034] Figure 21 A structure schematic diagram of an optical imaging lens of embodiment 4-2 of the present application is shown;

[0035] Figures 22 to 25The axial chromatic aberration curve, the astigmatism curve, the distortion curve and the rate of change of magnification chromatic aberration curve of the optical imaging lens of the fourth embodiment of the utility model are shown respectively.

[0036] Figure 26 The MTF defocus curve graph of the optical imaging lens of an optional embodiment of the utility model when R1xN1 / d1s=-4.28 and R2 / (D1s-d1s)=0.71 is shown.

[0037] Figure 27 The MTF defocus curve graph of the optical imaging lens of an optional embodiment of the utility model when R1xN1 / d1s=-4.28 and R2 / (D1s-d1s)=0.47 is shown.

[0038] Figure 28 The MTF defocus curve graph of the optical imaging lens of an optional embodiment of the utility model when R1xN1 / d1s=-4.28 and R2 / (D1s-d1s)=1.48 is shown.

[0039] Among them, the above-mentioned drawings include the following reference signs:

[0040] P0, lens barrel; E1, first lens; S1, object side surface of the first lens; S2, image side surface of the first lens; E2, second lens; S3, object side surface of the second lens; S4, image side surface of the second lens; E3, third lens; S5, object side surface of the third lens; S6, image side surface of the third lens; E4, fourth lens; S7, object side surface of the fourth lens; S8, image side surface of the fourth lens; P1, first spacer; P2, second spacer; P3, third spacer. DETAILED DESCRIPTION

[0041] 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 utility model will be described in detail below with reference to the drawings and in combination with embodiments.

[0042] It should be noted that, unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0043] In the utility model, unless otherwise stated, the orientation words such as “up, down, top, bottom” are generally for the direction shown in the drawings, or for the vertical, perpendicular or gravity direction of the components themselves. Similarly, for the convenience of understanding and description, “inner, outer” refers to the inner and outer of the contour of each component itself, but the above orientation words are not used to limit the utility model.

[0044] It should be noted that in the present specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, 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.

[0045] 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.

[0046] In the present specification, 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 judgment of the surface shape in the paraxial region can be made in accordance with the judgment method of those skilled in the art, with the R value (R refers to the radius of curvature in the paraxial region, usually refers to the R value on the lens data in the optical software) being positive or negative to judge the convexity or concavity. In terms of the object side surface, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave. In terms of the image side surface, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex. In the present application, the left side is the object side and the right side is the image side.

[0047] In order to solve the problem that the four-piece optical imaging lens in the prior art has poor front end group stability due to meeting a large field of view, the utility model provides an optical imaging lens.

[0048] As Figures 1 to 28 shown, in an optional embodiment of the present application, the optical imaging lens comprises a lens barrel and a lens group and at least one spacer arranged in the lens barrel, the lens group is composed of four lenses, the four lenses are sequentially a first lens, a second lens, a third lens and a fourth lens from the object side to the image side; the at least one spacer comprises a first spacer arranged between the first lens and the second lens and in contact with the image side surface of the first lens; wherein the refractive index N1 of the first lens, the curvature radius R1 of the object side surface of the first lens and the inner diameter d1s of the object side surface of the first spacer satisfy: -5.09≤R1×N1 / d1s≤-2.32; the curvature radius R2 of the image side surface of the first lens, the inner diameter d1s of the object side surface of the first spacer and the outer diameter D1s of the object side surface of the first spacer satisfy: 0.55≤R2 / (D1s-d1s)≤1.42.

[0049] The optical imaging lens of the present application is composed of a lens barrel and four lenses and at least one spacer arranged in the lens barrel. By reasonably arranging the positions of the four lenses and the first spacer and setting the optical imaging lens to satisfy -5.09≤R1×N1 / d1s≤-2.32, the refractive index of the first lens is ensured, and the optical imaging lens is ensured not to have light leakage problems while satisfying a large field angle. However, in this case, the first spacer is prone to bending and deviation after assembly, the assembly stability of the front end structure is poor, and the optical imaging lens is prone to problems such as field curvature and dispersion. Therefore, the present application constrains 0.55≤R2 / (D1s-d1s)≤1.42, ensures the bending degree of the object side of the first lens, thereby ensuring the bearing width of the first lens and the first spacer within a reasonable range, ensuring the assembly stability, avoiding the bending and deviation of the first spacer during assembly, and further ensuring the stability of the optical performance of the optical imaging lens.

[0050] In addition, as shown in Table 1 and Figures 26 to 28 R1×N1 / d1s=-4.28, the optical imaging lens satisfies Figure 26 MTF defocus curve when R2 / (D1s-d1s)=0.71 is shown, Figure 27 MTF defocus curve when R2 / (D1s-d1s)=0.47 is shown, Figure 28 MTF defocus curve when R2 / (D1s-d1s)=1.48 is shown.

[0051] As can be seen from Figures 26 to 28 When R2 / (D1s-d1s)=0.71 is satisfied, the curves of each field are relatively concentrated and consistent, and the performance is good. When R2 / (D1s-d1s)=0.47 is satisfied, the curves of some fields drop, the defocus curves are dispersed, the performance of some outer fields is poor, and the performance is poor. When R2 / (D1s-d1s)=1.48 is satisfied, the curves of some fields drop, the defocus curves are dispersed, the performance of some outer fields is poor, and the performance is poor. As can be seen, when R2 / (D1s-d1s) is within the range of 0.55 to 1.42, the MTF defocus curve performs best. Therefore, the present application constrains 0.55≤R2 / (D1s-d1s)≤1.42, ensures the bending degree of the object side of the first lens, thereby ensures the bearing width of the first lens and the first spacer within a reasonable range, ensures the assembly stability of the optical imaging lens, and ensures the optical resolution performance.

[0052] Table 1

[0053] Conditional expression R2 / (D1s-d1s) = 0.71 R2 / (D1s-d1s) = 0.47 R2 / (D1s-d1s) = 1.48 MTF defocus curve Figure 26 Figure 27 Figure 28

[0054] In the embodiment, the at least one spacer further comprises a second spacer disposed between the second lens and the third lens and in contact with the image-side surface portion of the second lens, and a third spacer disposed between the third lens and the fourth lens and in contact with the image-side surface portion of the third lens.

[0055] In the embodiment, the effective focal length f1 of the first lens, the central thickness CT1 of the first lens on the optical axis, and the axial interval EP01 between the object-side end surface of the lens barrel and the first spacer satisfy: -2.18≤f1 / (EP01+CT1)≤-1.25. By the constraint of the conditional expression, the relationship between the effective focal length of the first lens and the sum of the central thickness of the first lens on the optical axis and the axial interval between the object-side end surface of the lens barrel and the first spacer is balanced, the edge thickness of the first lens and the dispensing space of the optical imaging lens are ensured, the moldability of the first lens is ensured, the thickness rationality of the first lens and the first spacer is ensured, and appearance problems such as overflow of glue can be prevented. By limiting the effective focal length of the first lens, the bending degree of the first lens is ensured, and the accurate transmission of light is ensured.

[0056] In the embodiment, the maximum axial thickness CP1 of the first spacer, the central thickness CT2 of the second lens on the optical axis, and the air interval T12 of the first lens and the second lens on the optical axis satisfy: 0.67≤(T12+CP1) / CT2≤4.78. By constraining T12 and CP1, the minimum change of optical sensitivity of the first spacer under the radial force is ensured, the stability of the optical performance of the optical imaging lens is ensured, and by limiting CT2, the minimum influence of the optical performance caused by the change of the central thickness processing tolerance of the second lens is ensured.

[0057] In the embodiment, the effective focal length f2 of the second lens and the axial interval EP12 between the first spacer and the second spacer satisfy: 1.41≤f2 / EP12≤4.90. By constraining the conditional expression, the bending degree of the second lens is ensured, and the light converges at the stop position of the optical imaging lens. Limiting EP12 is conducive to ensuring the edge thickness of the second lens and ensuring the moldability of the second lens.

[0058] In the embodiment, the outer diameter D2s of the object-side surface of the second spacer and the curvature radius R4 of the image-side surface of the second lens satisfy: -5.40≤D2s / R4≤-3.81. By the above expression, the outer diameter rationality of the second spacer is ensured, the width of the bearing surface of the image-side surface of the second lens is ensured to be within a reliable range, and R4 is limited to ensure the accurate transmission of light of the second lens.

[0059] In the embodiment, the air interval T23 of the second lens and the third lens on the optical axis and the maximum axial thickness CP2 of the second spacer satisfy: 0.21≤T23 / CP2≤2.73. By limiting the air interval of the second lens and the third lens on the optical axis, the resolving power performance of the optical imaging lens is improved, and by limiting the maximum axial thickness of the second spacer, the optical imaging lens is prevented from being affected by the actual processing edge thickness of the lens, thereby affecting the optical field curvature, and by limiting CP2, the optical field curvature between the second lens and the third lens can be adjusted to ensure the performance stability of the optical imaging lens.

[0060] In the embodiment, the curvature radius R6 of the image side surface of the third lens, the outer diameter D3s of the object side surface of the third spacer, and the inner diameter d3s of the object side surface of the third spacer satisfy: -1.37≤R6 / (D3s-d3s)≤-0.27. By restricting the condition, it is ensured that the light rays emitted by the third lens produce less stray light effect, so that more stray light rays are intercepted by the third spacer, and the imaging quality of the optical imaging lens is ensured.

[0061] In the embodiment, the central thickness CT3 of the third lens on the optical axis and the axial interval EP23 between the second spacer and the third spacer satisfy: 0.87≤CT3 / EP23≤1.82. By limiting the central thickness and the edge thickness of the third lens by the above expression, the uniformity of the overall thickness of the third lens is beneficial, the forming feasibility of the third lens is ensured, and problems such as appearance during the forming process of the third lens are prevented.

[0062] In the embodiment, the curvature radius R7 of the object side surface of the fourth lens, the refractive index N4 of the fourth lens, and the outer diameter D3m of the image side surface of the third spacer satisfy: -1.29≤R7×N4 / D3m≤-0.47. Such setting limits the curvature radius and the refractive index of the object side surface of the fourth lens, ensures the bending degree of the fourth lens, ensures that the exit light spot of the optical imaging lens is affected by the optical ghost image as little as possible, and by limiting the expression, it is beneficial to reduce the threshold value of the optical ghost image, and limiting the outer diameter of the third spacer is beneficial to ensure the bearing width between the third lens and the fourth lens, and ensure the assembly stability.

[0063] In the embodiment, the curvature radius R8 of the image side surface of the fourth lens and the inner diameter d0m of the image side end surface of the lens barrel satisfy: -1.50≤R8 / d0m≤-0.62. Such setting ensures the bending degree of the image side surface of the fourth lens, and ensures the convergence degree of the exit light rays of the optical imaging lens. By limiting d0m, the exit light rays of the optical imaging lens can be prevented from being reflected at a certain angle on the filter and the exit hole slope of the lens barrel to produce serious lens stray light, and the imaging quality is affected by the stray light.

[0064] In the embodiment, the maximum axial height L of the lens barrel and the total sum ∑AT of the air gaps on the optical axis between adjacent lenses among the first lens to the fourth lens satisfy: 2.19≤L / ∑AT≤5.54. The setting limits the proportion of the total sum of the air gaps to the axial height of the lens barrel, ensures the reasonable distribution of the air gaps between adjacent lenses and the central thickness of each lens, ensures the stability of the air gaps of the optical imaging lens before and after baking, and ensures the optical performance of the optical imaging lens.

[0065] In the embodiment, the first lens has a negative optical power, the second lens has a positive optical power, and the third lens has a positive optical power; the object side surface of the first lens is a concave surface, and the image side surface is a concave surface; the object side surface of the second lens is a concave surface, and the image side surface is a convex surface; the object side surface of the third lens is a concave surface, and the image side surface is a convex surface; and the object side surface of the fourth lens is a concave surface, and the image side surface is a convex surface. By reasonably constraining the optical power and surface shape of each lens, the light path is reasonably constrained, the light transition is smooth, the aberration is corrected, and the imaging quality is ensured.

[0066] In the embodiment, each lens can be selected to be a cut-edge lens. The cut-edge lens has a cut-edge structure and a non-cut-edge structure on the outer diameter surface, and the outer diameter of the cut-edge structure is smaller than that of the non-cut-edge structure. The outer diameter of the cut-edge lens generally refers to the outer diameter of the non-cut-edge structure.

[0067] In the embodiment, each spacer can be selected to be a cut-edge spacer. The cut-edge spacer has a cut-edge portion and a non-cut-edge portion on the outer ring surface, and the outer diameter of the cut-edge portion is smaller than that of the non-cut-edge portion. The outer diameter of the cut-edge spacer generally refers to the maximum outer diameter of the non-cut-edge portion.

[0068] Optionally, the optical imaging lens in the embodiment of the present application can be simulated by software and / or tools such as ZEMAX, CODEV, etc. In the process of simulation by software and / or tools such as the above, the surface shape of each lens can be simulated according to the surface shape provided by the software and / or tools used.

[0069] In addition, in another optional embodiment of the present application, as Figures 1 to 28Also shown, there is provided an optical imaging lens comprising a lens barrel and a lens set and at least one spacer disposed in the lens barrel, the lens set consisting of four lenses, the four lenses being, in order from the object side to the image side, a first lens having negative refractive power, a second lens having positive refractive power, a third lens having positive refractive power, and a fourth lens having refractive power; the object side surface of the first lens is concave, and the image side surface of the first lens is concave; the object side surface of the second lens is concave, and the image side surface of the second lens is convex; the object side surface of the third lens is concave, and the image side surface of the third lens is convex; the object side surface of the fourth lens is concave, and the image side surface of the fourth lens is convex; the at least one spacer comprises a first spacer disposed between the first lens and the second lens and partially in contact with the image side surface of the first lens, and a second spacer disposed between the second lens and the third lens and partially in contact with the image side surface of the second lens; wherein the refractive index N1 of the first lens, the curvature radius R1 of the object side surface of the first lens, and the inner diameter d1s of the object side surface of the first spacer satisfy: -5.09≤R1×N1 / d1s≤-2.32; and the effective focal length f1 of the first lens, the central thickness CT1 of the first lens on the optical axis, and the axial interval EP01 between the object side end surface of the lens barrel and the first spacer satisfy: -2.18≤f1 / (EP01+CT1)≤-1.25.

[0070] The optical imaging lens of the present application consists of a lens barrel and four lenses and at least one spacer disposed in the lens barrel, by reasonably arranging the refractive power and surface type of the four lenses, the positions of the first spacer and the second spacer, and setting the optical imaging lens to satisfy: -5.09≤R1×N1 / d1s≤-2.32, the refractive index of the first lens is ensured, and the optical imaging lens is ensured not to have light leakage problem while satisfying a large field angle. However, in this case, the first spacer is prone to bending, deviation and other conditions after assembly, and the assembly stability of the front end structure is poor. Therefore, the present application limits -2.18≤f1 / (EP01+CT1)≤-1.25, ensures the edge thickness of the first lens and the dispensing space of the optical imaging lens, ensures the formability of the first lens, ensures the assembly stability of the front end lens, and can prevent appearance problems such as overflow. By limiting the effective focal length of the first lens, the bending degree of the first lens is ensured, and the accurate transmission of light is ensured.

[0071] Of course, the present embodiment can also include other parameter formulas in the above embodiments, which will not be described one by one here.

[0072] In addition, in another optional embodiment of the present application, as Figures 1 to 28Also shown, there is provided an optical imaging lens comprising a lens barrel and a lens set and at least one spacer disposed in the lens barrel, the lens set consisting of four lenses, the four lenses being, in order from the object side to the image side, a first lens having negative refractive power, a second lens having positive refractive power, a third lens having positive refractive power, and a fourth lens having refractive power; the object side surface of the first lens is concave, and the image side surface of the first lens is concave; the object side surface of the second lens is concave, and the image side surface of the second lens is convex; the object side surface of the third lens is concave, and the image side surface of the third lens is convex; the object side surface of the fourth lens is concave, and the image side surface of the fourth lens is convex; the at least one spacer comprises a first spacer disposed between the first lens and the second lens and partially in contact with the image side surface of the first lens, a second spacer disposed between the second lens and the third lens and partially in contact with the image side surface of the second lens, and a third spacer disposed between the third lens and the fourth lens and partially in contact with the image side surface of the third lens; the effective focal length f1 of the first lens and the inner diameter d1s of the object side surface of the first spacer satisfy: -2.17≤f1 / d1s≤-0.89; the outer diameter D3s of the object side surface of the third spacer and the inner diameter d3s of the object side surface of the third spacer satisfy: 1.44≤D3s / d3s≤3.30.

[0073] The optical imaging lens of the present application consists of a lens barrel and four lenses and at least one spacer disposed in the lens barrel, by reasonably arranging the refractive power and surface shape of the four lenses, the positions of the first to third spacers and setting the optical imaging lens to satisfy -2.17≤f1 / d1s≤-0.89 and 1.44≤D3s / d3s≤3.30, the first spacer can intercept stray light at the edge of the first lens, thereby reducing stray light, while ensuring the rationality of the size of the third spacer, ensuring the structural strength of the third spacer, and further ensuring the stability of the abutment with the third lens.

[0074] Of course, the present embodiment can also include other parameter formulas in the above embodiments, which will not be described one by one here.

[0075] Optionally, the above optical imaging lens can also include a protective glass for protecting the photosensitive element located on the imaging surface, and a color filter located on the object side of the protective glass.

[0076] The optical imaging lens in the present application can adopt multiple lenses, for example, the above-mentioned four lenses. In the present application, at least one of the mirror surfaces of each lens is a non-spherical mirror surface. The characteristic of the aspherical 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 constant curvature from the center of the lens to the periphery of the lens, the aspherical lens has better curvature radius characteristics, has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting the aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality.

[0077] 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 in the present application, to obtain the various results and advantages described in the present specification. For example, although described in the embodiments by way of example of four lenses, the optical imaging lens is not limited to including four lenses. If necessary, the optical imaging lens can also include other numbers of lenses.

[0078] Figure 1 The size annotation diagram of one optical imaging lens of the present application is shown, Figure 1 The parameters D1s, D2s, D3s, d1s, d0m, D3m, d3s, CP1, CP2, EP01, EP12, EP23, L, etc. are marked in the figure to clearly and intuitively understand the meaning of the parameters. In order to facilitate the description of the optical imaging lens and the surface shape of the specific lens, these parameters are no longer embodied in the figure when the specific embodiments are described below.

[0079] The specific surface shape and parameters of the optical imaging lens applicable to the above embodiments are further described below with reference to the drawings.

[0080] It should be noted that there are two examples of embodiment 1-1 and embodiment 1-2 in the following embodiment one, two examples of embodiment 2-1 and embodiment 2-2 in the following embodiment two, two examples of embodiment 3-1 and embodiment 3-2 in the following embodiment three, and two examples of embodiment 4-1 and embodiment 4-2 in the following embodiment four. The curvature radius, central thickness, etc. of the first lens to the fourth lens of the optical imaging lens in the two examples in the same embodiment are the same, but the thickness, inner diameter and outer diameter of the lens barrel, the first spacer to the third spacer are different. Or, the main structure for imaging is the same, and the auxiliary structure for imaging is different.

[0081] It should be noted that any one of the following embodiments one to four is applicable to all embodiments of the present application.

[0082] Embodiment one

[0083] As shown in Figures 2 to 7 , the optical imaging lens of embodiment one is described. Figure 2 The structural schematic diagram of the optical imaging lens of embodiment 1-1 is shown, Figure 3 The structural schematic diagram of the optical imaging lens of embodiment 1-2 is shown.

[0084] As shown in Figure 2 and Figure 3As shown, the optical imaging lens includes a lens barrel P0 and, in sequence from the object side to the image side along the optical axis, a first lens E1, a first spacer P1, a first auxiliary spacer P1b, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, and a fourth lens E4 arranged in the lens barrel P0.

[0085] As shown in FIG. 1A, the optical imaging lens of the embodiment 1-1 is a structure schematic diagram. In this example, the object side surface and the image side surface of the first spacer P1 are in abutment with the image side surface S2 of the first lens and the object side surface of the first auxiliary spacer P1b, respectively. The image side surface of the first auxiliary spacer P1b is in partial abutment with the object side surface S3 of the second lens. The object side surface and the image side surface of the second spacer P2 are in partial abutment with the image side surface S4 of the second lens and the object side surface S5 of the third lens, respectively. The object side surface and the image side surface of the third spacer P3 are in partial abutment with the image side surface S6 of the third lens and the object side surface S7 of the fourth lens, respectively. Figure 2 As shown in FIG. 1B, the optical imaging lens of the embodiment 1-2 is a structure schematic diagram. In this example, the abutment manner of each spacer is the same as that of the embodiment 1-1, and the related description in the embodiment 1-1 can be referred to, which will not be repeated here.

[0086] Figure 3 As shown in FIG. 1B, the optical imaging lens of the embodiment 1-2 is a structure schematic diagram. In this example, the abutment manner of each spacer is the same as that of the embodiment 1-1, and the related description in the embodiment 1-1 can be referred to, which will not be repeated here.

[0087] In summary, the structure parameters of the optical imaging lens of the embodiment one under the embodiments 1-1 and 1-2 are shown in Table 2.

[0088] (unit: mm)

[0089] Table 2

[0090]

[0091]

[0092] In the embodiment one, the object side surface S1 of the first lens is a concave surface, and the image side surface S2 of the first lens is a concave surface. The object side surface S3 of the second lens is a concave surface, and the image side surface S4 of the second lens is a convex surface. The object side surface S5 of the third lens is a concave surface, and the image side surface S6 of the third lens is a convex surface. The object side surface S7 of the fourth lens is a concave surface, and the image side surface S8 of the fourth lens is a convex surface.

[0093] In the embodiment one, the effective focal length f1 of the first lens is -0.71 mm, the effective focal length f2 of the second lens is 0.48 mm, the effective focal length f3 of the third lens is 10.00 mm, and the effective focal length f4 of the fourth lens is 32.00 mm.

[0094] Table 3 shows the basic structure parameter table of the optical imaging lens of the embodiment one, wherein the units of the curvature radius and the thickness / distance are millimeters mm. ​

[0095] Table 3

[0096]

[0097] In embodiment one, the object side and the image side of the first lens E1 to the fourth lens E4 are aspherical surfaces, and the surface type of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0098]

[0099] wherein x is the sag of the aspherical surface at a position along the optical axis with a height of h, c is the paraxial curvature of the aspherical surface, c = 1 / R, i.e., the paraxial curvature c is the inverse of the curvature radius R in Table 1 above, k is the conic coefficient, and Ai is the correction coefficient of the i-th order of the aspherical surface. Table 4 below provides the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28 that can be used for the aspherical surfaces S1-S8 in embodiment one.

[0100] Table 4

[0101]

[0102]

[0103] Figure 4 The on-axis chromatic aberration curve of the optical imaging lens in embodiment one is shown, which represents the deviation of the converging focus points of light rays of different wavelengths after passing through the imaging lens. Figure 5 The astigmatism curve of the optical imaging lens in embodiment one is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 6 The distortion curve of the optical imaging lens in embodiment one is shown, which represents the distortion size values corresponding to different field angles. Figure 7 The magnification chromatic aberration curve of the optical imaging lens in embodiment one is shown, which represents the deviation of the image height on the imaging plane after the light rays pass through the optical imaging lens.

[0104] According to Figures 4 to 7 It can be seen that the optical imaging lens given in embodiment one can achieve good imaging quality.

[0105] Embodiment two

[0106] As Figures 8 to 13 shown, the optical imaging lens in embodiment two is described. Figure 8 The structural schematic diagram of the optical imaging lens in embodiment 2-1 is shown, Figure 9 The structural schematic diagram of the optical imaging lens in embodiment 2-2 is shown.

[0107] AsFigure 8 and Figure 9 As shown in FIG. 2, the optical imaging lens includes a lens barrel P0 and, in sequence from the object side to the image side along the optical axis, a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a third auxiliary spacer P3b, and a fourth lens E4 arranged in the lens barrel P0.

[0108] As shown in FIG. 3, it is a structural schematic diagram of the optical imaging lens of Embodiment 2-1. In this example, the image side of the second spacer P2 is further provided with a second auxiliary spacer P2b. The object side and the image side of the first spacer P1 are partially in abutment with the image side S2 of the first lens and the object side S3 of the second lens, respectively. The object side and the image side of the second spacer P2 are partially in abutment with the image side S4 of the second lens and the object side S5 of the third lens, respectively. The object side and the image side of the third spacer P3 are partially in abutment with the image side S6 of the third lens and the object side S7 of the fourth lens, respectively. The image side of the third auxiliary spacer P3b is partially in abutment with the object side S7 of the fourth lens. Figure 8 As shown in FIG. 4, it is a structural schematic diagram of the optical imaging lens of Embodiment 2-2. The difference between this example and Embodiment 2-1 is that the second auxiliary spacer P2b is not arranged. The object side and the image side of the second spacer P2 are partially in abutment with the image side S4 of the second lens and the object side S5 of the third lens, respectively. The abutment modes of the remaining spacers are the same as those in Embodiment 2-1, and reference can be made to the related description in Embodiment 2-1, which will not be described here.

[0109] Figure 9 As shown in FIG. 4, it is a structural schematic diagram of the optical imaging lens of Embodiment 2-2. The difference between this example and Embodiment 2-1 is that the second auxiliary spacer P2b is not arranged. The object side and the image side of the second spacer P2 are partially in abutment with the image side S4 of the second lens and the object side S5 of the third lens, respectively. The abutment modes of the remaining spacers are the same as those in Embodiment 2-1, and reference can be made to the related description in Embodiment 2-1, which will not be described here.

[0110] In summary, the structural parameters of the optical imaging lens in Embodiment 2 under Embodiments 2-1 and 2-2 are shown in Table 5.

[0111] (unit: mm)

[0112] Table 5

[0113] Parameter / Embodiment 2-1 2-2 d1s (mm) 0.640 0.710 D1s (mm) 1.794 1.826 D2s (mm) 1.554 1.726 d3s (mm) 0.896 0.574 D3s (mm) 1.294 1.426 D3m (mm) 1.346 1.495 d0m (mm) 0.914 0.945 CP1 (mm) 0.022 0.022 CP2 (mm) 0.146 0.022 EP01 (mm) 0.504 0.515 EP12 (mm) 0.147 0.318 EP23 (mm) 0.189 0.152 L (mm) 1.576 1.617

[0114] In Embodiment 2, the object side S1 of the first lens is a concave surface, and the image side S2 of the first lens is a concave surface. The object side S3 of the second lens is a concave surface, and the image side S4 of the second lens is a convex surface. The object side S5 of the third lens is a concave surface, and the image side S6 of the third lens is a convex surface. The object side S7 of the fourth lens is a concave surface, and the image side S8 of the fourth lens is a convex surface.

[0115] ​In embodiment two, the effective focal length f1 of the first lens is -0.87mm, the effective focal length f2 of the second lens is 0.72mm, the effective focal length f3 of the third lens is 2.04mm, and the effective focal length f4 of the fourth lens is 42.61mm.

[0116] Table 6 shows the basic structure parameter table of the optical imaging lens of embodiment two, wherein the units of the radius of curvature, thickness / distance are millimeters mm.

[0117] Table 6

[0118]

[0119]

[0120] The following table 7 gives the high order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28 which can be used for each aspherical mirror S1-S8 in embodiment two.

[0121] Table 7

[0122]

[0123] Figure 10 The axial chromatic aberration curve of the optical imaging lens of embodiment two is shown, which represents the convergence focal point deviation of light rays of different wavelengths after passing through the imaging lens. Figure 11 The astigmatism curve of the optical imaging lens of embodiment two is shown, which represents the meridional image surface bending and sagittal image surface bending. Figure 12 The distortion curve of the optical imaging lens of embodiment two is shown, which represents the distortion size value corresponding to different field angles of view. Figure 13 The magnification chromatic aberration curve of the optical imaging lens of embodiment two is shown, which represents the deviation of light rays on the imaging surface after passing through the optical imaging lens.

[0124] According to Figures 10 to 13 It can be seen that the optical imaging lens given in embodiment two can achieve good imaging quality.

[0125] Embodiment three

[0126] As Figures 14 to 19 shown, the optical imaging lens of embodiment three is described. Figure 14 The structural schematic diagram of the optical imaging lens of embodiment 3-1 is shown, Figure 15 The structural schematic diagram of the optical imaging lens of embodiment 3-2 is shown.

[0127] As Figure 14 and Figure 15As shown, the optical imaging lens includes a lens barrel P0 and, in sequence from the object side to the image side along the optical axis, a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, and a fourth lens E4 arranged in the lens barrel P0.

[0128] As shown in FIG. 3-1, the optical imaging lens of Example 3-1 is a structure schematic diagram. The object side surface and the image side surface of the first spacer P1 are partially in abutment with the image side surface S2 of the first lens and the object side surface S3 of the second lens, respectively. The object side surface and the image side surface of the second spacer P2 are partially in abutment with the image side surface S4 of the second lens and the object side surface S5 of the third lens, respectively. The object side surface and the image side surface of the third spacer P3 are partially in abutment with the image side surface S6 of the third lens and the object side surface S7 of the fourth lens, respectively. Figure 14 As shown in FIG. 3-2, the optical imaging lens of Example 3-2 is a structure schematic diagram. In this example, the abutment abutment mode of each spacer is the same as that of Example 3-1, and the relevant description in Example 3-1 can be referred to, which will not be repeated here.

[0129] Figure 15 As shown in FIG. 3-2, the optical imaging lens of Example 3-2 is a structure schematic diagram. In this example, the abutment abutment mode of each spacer is the same as that of Example 3-1, and the relevant description in Example 3-1 can be referred to, which will not be repeated here.

[0130] In summary, the structure parameters of the optical imaging lens of Example Three under Example 3-1 and Example 3-2 are shown in Table 8.

[0131] (Unit: mm)

[0132] Table 8

[0133] Parameter / Embodiment 3-1 3-2 d1s (mm) 0.880 0.847 D1s (mm) 2.151 2.132 D2s (mm) 1.877 2.032 d3s (mm) 0.589 0.586 D3s (mm) 1.571 1.932 D3m (mm) 1.571 1.932 d0m (mm) 0.933 1.056 CP1 (mm) 0.022 0.022 CP2 (mm) 0.022 0.022 EP01 (mm) 0.523 0.565 EP12 (mm) 0.598 0.599 EP23 (mm) 0.209 0.189 L (mm) 2.048 2.106

[0134] In Example Three, the object side surface S1 of the first lens is a concave surface, and the image side surface S2 of the first lens is a concave surface. The object side surface S3 of the second lens is a concave surface, and the image side surface S4 of the second lens is a convex surface. The object side surface S5 of the third lens is a concave surface, and the image side surface S6 of the third lens is a convex surface. The object side surface S7 of the fourth lens is a concave surface, and the image side surface S8 of the fourth lens is a convex surface.

[0135] In Example Three, the effective focal length f1 of the first lens is -1.84 mm, the effective focal length f2 of the second lens is 2.11 mm, the effective focal length f3 of the third lens is 0.67 mm, and the effective focal length f4 of the fourth lens is -2.24 mm.

[0136] Table 9 shows the basic structure parameter table of the optical imaging lens of Example Three, wherein the units of the curvature radius and the thickness / distance are millimeters mm.

[0137] Table 9

[0138]

[0139] ​

[0140] The following Table 10 shows the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28 of each aspherical mirror S1-S8 used in Example Three.

[0141] Table 10

[0142]

[0143] Figure 16 The on-axis chromatic aberration curve of the optical imaging lens arrangement of Example Three is shown, which represents the convergence point deviation of light rays of different wavelengths after passing through the imaging lens arrangement. Figure 17 The astigmatism curve of the optical imaging lens arrangement of Example Three is shown, which represents the meridional image curvature and sagittal image curvature. Figure 18 The distortion curve of the optical imaging lens arrangement of Example Three is shown, which represents the distortion size values corresponding to different field angles. Figure 19 The lateral chromatic aberration curve of the optical imaging lens arrangement of Example Three is shown, which represents the deviation of light rays on the imaging plane after passing through the optical imaging lens arrangement at different image heights.

[0144] According to Figures 16 to 19 It can be known that the optical imaging lens arrangement provided in Example Three can achieve good imaging quality.

[0145] Example Four

[0146] As Figures 20 to 25 shown, the optical imaging lens arrangement of Example Four is described. Figure 20 The structural schematic diagram of the optical imaging lens arrangement of Example 4-1 is shown, Figure 21 The structural schematic diagram of the optical imaging lens arrangement of Example 4-2 is shown.

[0147] As Figure 20 and Figure 21 shown, the optical imaging lens arrangement includes a lens barrel P0 and, arranged in the lens barrel P0 in order from the object side to the image side along the optical axis, a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a third auxiliary spacer P3b, and a fourth lens E4.

[0148] As Figure 20As shown in Fig. 4-1, it is a structural schematic diagram of the optical imaging lens of embodiment 4-1. In this example, the object side and image side of the first spacer P1 are partially abutted with the image side S2 of the first lens and the object side S3 of the second lens respectively. The object side and image side of the second spacer P2 are partially abutted with the image side S4 of the second lens and the object side S5 of the third lens respectively. The object side and image side of the third spacer P3 are partially abutted with the image side S6 of the third lens and the object side of the third auxiliary spacer P3b respectively, and the image side of the third auxiliary spacer P3b is partially abutted with the object side S7 of the fourth lens.

[0149] As shown in Fig. 4-2, it is a structural schematic diagram of the optical imaging lens of embodiment 4-2. In this example, the image side of the second spacer P2 is further provided with a second auxiliary spacer P2b, at this time, the object side and image side of the second spacer P2 are partially abutted with the image side S4 of the second lens and the object side of the second auxiliary spacer P2b respectively, and the image side of the second auxiliary spacer P2b is partially abutted with the object side S5 of the third lens. The abutting modes of the rest of the spacers are the same as those in embodiment 4-1, and the related descriptions in embodiment 4-1 can be referred to, which will not be repeated here. Figure 21

[0150] In summary, the structural parameters of the optical imaging lens of embodiment four under embodiment 4-1 and embodiment 4-2 are shown in Table 11.

[0151] (unit: mm)

[0152] Table 11

[0153] Parameter / Embodiment 4-1 4-2 d1s (mm) 0.664 0.657 D1s (mm) 1.662 1.551 D2s (mm) 1.562 1.330 d3s (mm) 0.801 0.735 D3s (mm) 1.170 1.196 D3m (mm) 1.230 1.240 d0m (mm) 0.872 0.982 CP1 (mm) 0.022 0.022 CP2 (mm) 0.022 0.155 EP01 (mm) 0.502 0.489 EP12 (mm) 0.340 0.186 EP23 (mm) 0.133 0.188 L (mm) 1.598 1.601

[0154] In embodiment four, the object side S1 of the first lens is a concave surface, and the image side S2 of the first lens is a concave surface. The object side S3 of the second lens is a concave surface, and the image side S4 of the second lens is a convex surface. The object side S5 of the third lens is a concave surface, and the image side S6 of the third lens is a convex surface. The object side S7 of the fourth lens is a concave surface, and the image side S8 of the fourth lens is a convex surface.

[0155] In embodiment four, the effective focal length f1 of the first lens is -1.05 mm, the effective focal length f2 of the second lens is 0.87 mm, the effective focal length f3 of the third lens is 1.60 mm, and the effective focal length f4 of the fourth lens is 20.91 mm.

[0156] Table 12 shows the basic structural parameter table of the optical imaging lens of embodiment four, wherein the units of the curvature radius and the thickness / distance are millimeters mm.

[0157] Table 12

[0158] ​

[0159] The following Table 13 shows the high order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28 of each aspherical mirror S1-S8 used in Example Four.

[0160] Table 13

[0161]

[0162] Figure 22 The on-axis chromatic aberration curve of the optical imaging lens of Example Four is shown, which represents the convergence point deviation of light rays of different wavelengths after passing through the imaging lens. Figure 23 The astigmatism curve of the optical imaging lens of Example Four is shown, which represents the meridional image curvature and sagittal image curvature. Figure 24 The distortion curve of the optical imaging lens of Example Four is shown, which represents the distortion size value corresponding to different field angles. Figure 25 The magnification chromatic aberration curve of the optical imaging lens of Example Four is shown, which represents the deviation of light rays on the imaging plane at different image heights after passing through the optical imaging lens.

[0163] According to Figures 22 to 25 It can be seen that the optical imaging lens provided in Example Four can achieve good imaging quality.

[0164] In summary, Examples One to Four respectively satisfy the relationships shown in Table 14.

[0165] Table 14

[0166] Conditional expression / Embodiment 1-1 1-2 2-1 2-2 3-1 3-2 4-1 4-2 R1 x N1 / d1s -2.32 -2.63 -4.54 -4.09 -4.90 -5.09 -4.28 -4.32 R2 / (D1s-d1s) 0.87 0.60 0.55 0.57 1.42 1.40 0.71 0.79 f1 / (EP01+CT1) -1.25 -1.28 -1.33 -1.31 -2.18 -2.08 -1.59 -1.62 (T12+CP1) / CT2 4.78 3.71 3.11 3.11 0.67 0.67 1.86 1.86 f2 / EP12 2.27 1.41 4.90 2.26 3.53 3.52 2.56 4.68 D2s / R4 -4.96 -5.04 -4.86 -5.40 -3.81 -4.12 -4.49 -3.83 T23 / CP2 1.36 1.36 0.21 1.37 2.73 2.73 1.64 0.23 R6 / (D3s-d3s) -0.71 -0.70 -1.26 -0.59 -0.37 -0.27 -1.37 -1.10 CT3 / EP23 1.02 0.87 1.19 1.49 1.34 1.48 1.82 1.29 R7 x N4 / D3m -0.64 -0.63 -0.96 -0.87 -0.58 -0.47 -1.29 -1.28 R8 / d0m -0.62 -0.64 -0.86 -0.83 -1.50 -1.33 -1.12 -1.00 L / ∑AT 2.59 2.55 2.19 2.25 5.39 5.54 2.67 2.67 f1 / d1s -0.89 -1.01 -1.36 -1.23 -2.09 -2.17 -1.58 -1.60 D3s / d3s 2.37 2.36 1.44 2.48 2.67 3.30 1.46 1.63

[0167] Table 15 shows the effective focal length of each lens of the optical imaging lens of Examples One to Four.

[0168] Table 15

[0169] Parameter / Embodiment One Two Three Four f1 (mm) -0.71 -0.87 -1.84 -1.05 f2 (mm) 0.48 0.72 2.11 0.87 f3 (mm) 10.00 2.04 0.67 1.60 f4 (mm) 32.00 42.61 -2.24 20.91

[0170] 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 (CMOS). The imaging device can be a standalone imaging device such as a digital camera, or an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

[0171] Obviously, the above-described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work should belong to the protection scope of the present application.

[0172] It is to be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments consistent with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, devices, components and / or combinations thereof, but do not preclude the presence or addition of one or more other features, steps, operations, devices, components and / or combinations thereof.

[0173] It is to be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments consistent with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, devices, components and / or combinations thereof, but do not preclude the presence or addition of one or more other features, steps, operations, devices, components and / or combinations thereof.

[0174] The preferred embodiments of the present application have been described above with the aid of drawing figures, and are not limited to those embodiments; instead, they will include any changes that do not constitute departures from the spirit and scope of the present application.

Claims

1. An optical imaging lens, characterized in that, The lens barrel comprises a lens barrel body, and a lens group and at least one spacer disposed in the lens barrel body, The lens group is composed of four lenses, and the four lenses are, in order from the object side to the image side, a first lens, a second lens, a third lens, and a fourth lens. The at least one spacer comprises a first spacer disposed between the first lens and the second lens and in partial contact with an image side surface of the first lens. The refractive index N1 of the first lens, the curvature radius R1 of the object side surface of the first lens, and the inner diameter d1s of the object side surface of the first spacer satisfy: -5.09≤R1×N1 / d1s≤-2.

32. The curvature radius R2 of the image side surface of the first lens, the inner diameter d1s of the object side surface of the first spacer, and the outer diameter D1s of the object side surface of the first spacer satisfy: 0.55≤R2 / (D1s-d1s)≤1.

42. 2.The optical imaging lens according to claim 1, wherein, The effective focal length f1 of the first lens, the central thickness CT1 of the first lens on the optical axis, and the axial interval EP01 between the object side end surface of the lens barrel and the first spacer satisfy: -2.18≤f1 / (EP01+CT1)≤-1.

25. 3.The optical imaging lens according to claim 1, wherein, The maximum axial thickness CP1 of the first spacer, the central thickness CT2 of the second lens on the optical axis, and the air interval T12 of the first lens and the second lens on the optical axis satisfy: 0.67≤(T12+CP1) / CT2≤4.

78. 4.The optical imaging lens according to claim 1, wherein, The at least one spacer further comprises a second spacer disposed between the second lens and the third lens and in partial contact with an image side surface of the second lens, The effective focal length f2 of the second lens and the axial interval EP12 between the first spacer and the second spacer satisfy: 1.41≤f2 / EP12≤4.

90.

5. The optical imaging lens according to claim 1, characterized in that, The at least one spacer further comprises a second spacer disposed between the second lens and the third lens and in partial contact with an image side surface of the second lens, The outer diameter D2s of the object side surface of the second spacer and the curvature radius R4 of the image side surface of the second lens satisfy: -5.40≤D2s / R4≤-3.

81. 6.The optical imaging lens according to claim 1, wherein, The at least one spacer further comprises a second spacer disposed between the second lens and the third lens and in partial contact with an image side surface of the second lens, The air interval T23 of the second lens and the third lens on the optical axis and the maximum axial thickness CP2 of the second spacer satisfy: 0.21≤T23 / CP2≤2.

73. 7.The optical imaging lens according to claim 1, wherein, The at least one spacer further comprises a third spacer disposed between the third lens and the fourth lens and in partial contact with an image side surface of the third lens, The curvature radius R6 of the image side surface of the third lens, the outer diameter D3s of the object side surface of the third spacer, and the inner diameter d3s of the object side surface of the third spacer satisfy: -1.37≤R6 / (D3s-d3s)≤-0.

27. 8.The optical imaging lens according to claim 1, wherein, The at least one spacer further includes a second spacer disposed between the second lens and the third lens and in contact with an image-side surface portion of the second lens, a third spacer disposed between the third lens and the fourth lens and in contact with an image-side surface portion of the third lens, A central thickness CT3 of the third lens on the optical axis and an axial interval EP23 between the second spacer and the third spacer satisfy: 0.87 ≤ CT3 / EP23 ≤ 1.

82. 9.The optical imaging lens according to claim 1, wherein, The at least one spacer further includes a third spacer disposed between the third lens and the fourth lens and in contact with an image-side surface portion of the third lens, A radius of curvature R7 of an object-side surface of the fourth lens, a refractive index N4 of the fourth lens, and an outer diameter D3m of an image-side surface of the third spacer satisfy: -1.29 ≤ R7 x N4 / D3m ≤ -0.

47. 10.The optical imaging lens according to claim 1, wherein, A radius of curvature R8 of an image-side surface of the fourth lens and an inner diameter d0m of an image-side end surface of the lens barrel satisfy: -1.50 ≤ R8 / d0m ≤ -0.

62. 11.The optical imaging lens according to claim 1, wherein, A maximum axial height L of the lens barrel and a sum ∑AT of air intervals on the optical axis between adjacent lenses among the first lens to the fourth lens satisfy: 2.19 ≤ L / ∑AT ≤ 5.

54.

12. The optical imaging lens according to any one of claims 1 to 11, wherein the first lens has a negative refractive power, the second lens has a positive refractive power, and the third lens has a positive refractive power; and / or an object-side surface of the first lens is a concave surface, an image-side surface of the first lens is a concave surface, an object-side surface of the second lens is a concave surface, an image-side surface of the second lens is a convex surface, an object-side surface of the third lens is a concave surface, an image-side surface of the third lens is a convex surface, an object-side surface of the fourth lens is a concave surface, and an image-side surface of the fourth lens is a convex surface.

Images