Optical imaging lens

Abstract

The invention 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. 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 the requirement for a large field angle is met is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of optical imaging equipment, and in particular to an optical imaging lens. Background Art

[0002] With the rapid development of modern electronic products, especially smartphones and portable devices, the design and performance requirements of optical imaging lenses are increasing day by day. Especially in VR, AR and other products, optical imaging lenses have become an indispensable part in obtaining key information such as eye movement through eye tracking.

[0003] In this technical background, four-piece optical imaging lenses are widely used due to their small number of lenses and simple structure. However, in the prior art, when pursuing a large field of view, the four-piece optical imaging lenses usually need to constrain the optical parameters of the first lens. However, in this case, it is difficult to control the bearing stability of the front lens, thereby affecting the assembly stability of the front structure and the performance stability of the optical imaging lens.

[0004] That is to say, the four-piece optical imaging lens in the prior art has the problem of poor front-end assembly stability due to the large field of view. Summary of the invention

[0005] The main purpose of the present invention is to provide an optical imaging lens to solve the problem that the four-lens optical imaging lens in the prior art has a large field of view, resulting in poor front-end assembly stability.

[0006] To achieve the above-mentioned purpose, according to one aspect of the present invention, an optical imaging lens is provided, comprising a lens barrel, a lens group and at least one spacer arranged in the lens barrel, wherein the lens group consists of four lenses, and the four lenses are, from the object side to the image side, a first lens, a second lens, a third lens and a fourth lens in sequence; the at least one spacer comprises a first spacer placed between the first lens and the second lens and in contact with the image side surface portion 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 the following relationship: -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 the following relationship: 0.55≤R2 / (D1s-d1s)≤1.42.

[0007] According to another aspect of the present invention, an optical imaging lens is provided, comprising a lens barrel, a lens group and at least one spacer arranged in the lens barrel, wherein the lens group is composed of four lenses, and the four lenses are, from the object side to the image side, a first lens with negative optical power, a second lens with positive optical power, a third lens with positive optical power and a fourth lens with 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; the object side surface of the fourth lens is a concave surface, and the image side surface is a convex surface; the at least one spacer includes a spacer disposed between the first lens and the second lens A first spacer is placed between the second lens and in contact with the image side surface of the first lens, and a second spacer is placed between the second lens and the third lens and 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; the effective focal length f1 of the first lens, the center 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.

[0008] According to another aspect of the present invention, an optical imaging lens is provided, comprising a lens barrel, a lens group arranged in the lens barrel, and at least one spacer, wherein the lens group is composed of four lenses, and the four lenses are, from the object side to the image side, a first lens with negative optical power, a second lens with positive optical power, a third lens with positive optical power, and a fourth lens with 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; the object side surface of the fourth lens is a concave surface, and the image side surface is a convex surface; the at least one spacer includes a spacer disposed A first spacer is placed between the first lens and the second lens and in contact with the image side surface of the first lens, a second spacer is placed between the second lens and the third lens and in contact with the image side surface of the second lens, and a third spacer is placed between the third lens and the fourth lens and 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.

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

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

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

[0012] Furthermore, at least one spacer also includes a second spacer placed between the second lens and the third lens and partially in contact with the image side surface of the second lens, and 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.

[0013] Furthermore, at least one spacer also includes a second spacer placed between the second lens and the third lens and in contact with the image side portion of the second lens, and the air gap T23 between 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] Furthermore, at least one spacer also includes a third spacer placed between the third lens and the fourth lens and partially in contact with the image side surface of the third lens, and 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.

[0015] Furthermore, at least one spacer also includes a second spacer placed between the second lens and the third lens and in contact with the image side portion of the second lens, and a third spacer placed between the third lens and the fourth lens and in contact with the image side portion of the third lens, and the center thickness CT3 of the third lens on the optical axis and the axial spacing EP23 between the second spacer and the third spacer satisfy: 0.87≤CT3 / EP23≤1.82.

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

[0017] Furthermore, a curvature radius R8 of the image-side surface of the fourth lens element 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 ΣAT of air intervals between adjacent lenses of the first to fourth lenses on the optical axis satisfy: 2.19≤L / ΣAT≤5.54.

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

[0020] According to the technical solution of the present invention, an optical imaging lens comprises a lens barrel, a lens group and at least one spacer arranged in the lens barrel, wherein the lens group comprises four lenses, and the four lenses are, from the object side to the image side, a first lens, a second lens, a third lens and a fourth lens in sequence; the at least one spacer comprises a first spacer placed between the first lens and the second lens and in contact with the image side surface portion 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 the following relationship: -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 the following relationship: 0.55≤R2 / (D1s-d1s)≤1.42.

[0021] The optical imaging lens of the present application is composed of a lens barrel, four lenses arranged in the lens barrel, and at least one spacer. By reasonably arranging the positions of the four lenses and the first spacer and setting the optical imaging lens to meet: -5.09≤R1×N1 / d1s≤-2.32, the refractive index of the first lens is guaranteed, and the optical imaging lens is guaranteed to have no light leakage problems while meeting a large field of view. However, in this case, the first spacer is prone to bending, offset, etc. after assembly, resulting in poor assembly stability of the front-end structure, and the optical imaging lens is prone to field curvature, discreteness, and other problems. Therefore, the present application ensures the curvature of the object side of the first lens by constraining 0.55≤R2 / (D1s-d1s)≤1.42, thereby ensuring that the supporting width of the first lens and the first spacer is within a reasonable range, thereby ensuring assembly stability, avoiding the bending and offset of the first spacer assembly, and further ensuring the stability of the optical performance of the optical imaging lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0023] Figure 1 A dimensioning diagram of an optical imaging lens according to an optional embodiment of the present invention is shown;

[0024] Figure 2 A schematic structural diagram of an optical imaging lens according to Embodiment 1-1 of the present invention is shown;

[0025] Figure 3 A schematic structural diagram of an optical imaging lens according to Embodiment 1-2 of the present invention is shown;

[0026] Figures 4 to 7 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging lens according to the first embodiment of the present invention are respectively shown;

[0027] Figure 8 A schematic structural diagram of an optical imaging lens according to Embodiment 2-1 of the present invention is shown;

[0028] Fig. 9 A schematic structural diagram of an optical imaging lens according to Embodiment 2-2 of the present invention is shown;

[0029] Figures 10 to 13 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging lens of the second embodiment of the present invention are respectively shown;

[0030] Fig.14 A schematic structural diagram of an optical imaging lens according to Embodiment 3-1 of the present invention is shown;

[0031] Fig.15 A schematic structural diagram of an optical imaging lens according to Embodiment 3-2 of the present invention is shown;

[0032] Figures 16 to 19 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging lens of the third embodiment of the present invention are respectively shown;

[0033] Fig. 20 A schematic structural diagram of an optical imaging lens according to Embodiment 4-1 of the present invention is shown;

[0034] Fig.21 A schematic structural diagram of an optical imaging lens according to Embodiment 4-2 of the present invention is shown;

[0035] Figure 22 to Figure 25The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging lens of the fourth embodiment of the present invention are respectively shown;

[0036] Fig.26 An MTF defocus curve diagram is shown when the optical imaging lens of an optional embodiment of the present invention satisfies R1×N1 / d1s=-4.28 and R2 / (D1s-d1s)=0.71;

[0037] Fig. 27 An MTF defocus curve diagram is shown when the optical imaging lens of an optional embodiment of the present invention satisfies R1×N1 / d1s=-4.28 and R2 / (D1s-d1s)=0.47;

[0038] Fig.28 The MTF defocus curve diagram of the optical imaging lens of an optional embodiment of the present invention is shown when R1×N1 / d1s=-4.28 and R2 / (D1s-d1s)=1.48.

[0039] The above drawings include the following reference numerals:

[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, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0042] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0043] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0044] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0045] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0046] In this article, the paraxial area refers to the area near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial area; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial area. The judgment of the surface shape in the paraxial area can be based on the judgment method of the general knowledge in this field, and the positive and negative R value (R refers to the radius of curvature of the paraxial area, usually refers to the R value on the lens database (lens data) in the optical software) is used to judge the convexity and concavity. For the object side, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; for the image side, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface. 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 a four-lens optical imaging lens in the prior art has a large field of view, which results in poor front-end assembly stability, the present invention provides an optical imaging lens.

[0048] like Figures 1 to 28 As shown, in an optional embodiment of the present application, the optical imaging lens includes 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 a first lens, a second lens, a third lens and a fourth lens in order from the object side to the image side; at least one spacer includes a first spacer placed between the first lens and the second lens and in contact with the image side portion 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, four lenses arranged in the lens barrel, and at least one spacer. By reasonably arranging the positions of the four lenses and the first spacer and setting the optical imaging lens to meet: -5.09≤R1×N1 / d1s≤-2.32, the refractive index of the first lens is guaranteed, and the optical imaging lens is guaranteed to have no light leakage problems while meeting a large field of view. However, in this case, the first spacer is prone to bending, offset, etc. after assembly, resulting in poor assembly stability of the front-end structure, and the optical imaging lens is prone to field curvature, discreteness, and other problems. Therefore, the present application ensures the curvature of the object side of the first lens by constraining 0.55≤R2 / (D1s-d1s)≤1.42, thereby ensuring that the supporting width of the first lens and the first spacer is within a reasonable range, thereby ensuring assembly stability, avoiding the bending and offset of the first spacer assembly, and further ensuring the stability of the optical performance of the optical imaging lens.

[0050] In addition, refer to Table 1 and Figure 26 to Figure 28 As shown, under the premise that the optical imaging lens satisfies R1×N1 / d1s=-4.28, Fig.26 The MTF defocus curve diagram when the optical imaging lens satisfies R2 / (D1s-d1s)=0.71 is shown. Fig. 27 The MTF defocus curve diagram when the optical imaging lens satisfies R2 / (D1s-d1s)=0.47 is shown. Fig.28 The MTF defocus curve diagram when the optical imaging lens satisfies R2 / (D1s-d1s)=1.48 is shown.

[0051] Depend on Figure 26 to Figure 28 It can be seen that when R2 / (D1s-d1s)=0.71 is met, the curves of each field of view are more gathered and concentrated, with better consistency and better performance. When R2 / (D1s-d1s)=0.47 is met, the peak value of the curve of some fields of view drops, the defocus curve becomes discrete, the performance of some outer fields of view deteriorates, and the performance is poor. When R2 / (D1s-d1s)=1.48 is met, the peak value of the curve of some fields of view drops, the defocus curve becomes discrete, the performance of some outer fields of view deteriorates, and the performance is poor. It can be seen that when R2 / (D1s-d1s) is in the range of 0.55 to 1.42, the MTF defocus curve performs best. Therefore, the present application ensures the curvature of the object side surface of the first lens by constraining 0.55≤R2 / (D1s-d1s)≤1.42, thereby ensuring that the supporting width between the first lens and the first spacer is within a reasonable range, ensuring better assembly stability of the optical imaging lens, and ensuring 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 Fig.26 Fig. 27 Fig.28

[0054] In this embodiment, the at least one spacer also includes a second spacer placed 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 placed between the third lens and the fourth lens and partially in contact with the image side surface of the third lens.

[0055] In this embodiment, the effective focal length f1 of the first lens, the center thickness CT1 of the first lens on the optical axis, and the axial spacing EP01 between the object side end face of the lens barrel and the first spacer satisfy: -2.18≤f1 / (EP01+CT1)≤-1.25. Through the constraint of this conditional expression, the relationship between the effective focal length of the first lens and the sum of the center thickness of the first lens on the optical axis and the axial spacing between the object side end face of the lens barrel and the first spacer is balanced, the edge thickness of the first lens and the glue dispensing space of the optical imaging lens are guaranteed, the molding feasibility of the first lens is guaranteed, the thickness of the first lens and the first spacer is reasonable, and appearance problems such as glue overflow can be prevented. By limiting the effective focal length of the first lens, the curvature of the first lens is guaranteed, and the accurate transmission of light is guaranteed.

[0056] In this embodiment, the maximum axial thickness CP1 of the first spacer, the center thickness CT2 of the second lens on the optical axis, and the air gap T12 between 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 optical sensitivity change of the first spacer when subjected to radial force is minimized, and the optical performance of the optical imaging lens is stable. By limiting CT2, the optical performance affected by the change in the processing tolerance of the center thickness of the second lens can be minimized.

[0057] In this embodiment, the effective focal length f2 of the second lens and the axial spacing EP12 between the first spacer and the second spacer satisfy: 1.41≤f2 / EP12≤4.90. Constraining this conditional expression ensures the curvature of the second lens and ensures that the light converges at the aperture position of the optical imaging lens. Limiting EP12 is conducive to ensuring the edge thickness of the second lens and ensuring the feasibility of molding the second lens.

[0058] In this 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. The above expression is conducive to ensuring the rationality of the outer diameter of the second spacer, ensuring that the width of the bearing surface of the image side surface of the second lens is within a reliable range, and limiting R4 to ensure that the light of the second lens can be accurately transmitted.

[0059] In this embodiment, the air gap T23 between 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 gap between the second lens and the third lens on the optical axis, the resolution performance of the optical imaging lens is improved, and at the same time, the maximum axial thickness of the second spacer is limited to prevent the optical imaging lens from being affected by the actual edge thickness of the lens during processing, thereby affecting the optical field curvature. 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 this 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 constraining this conditional expression, it is ensured that the light emitted by the third lens generates less stray light, so that more stray light is intercepted by the third spacer, thereby ensuring the imaging quality of the optical imaging lens.

[0061] In this 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. The central thickness and edge thickness of the third lens are limited by the above expression, which is beneficial to the uniformity of the overall thickness of the third lens, ensures the molding feasibility of the third lens, and prevents the appearance and other problems of the third lens from occurring during the molding process.

[0062] In this 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. This setting limits the curvature radius and refractive index of the object side surface of the fourth lens, ensures the curvature degree of the fourth lens, and ensures that the output light spot of the optical imaging lens is minimally affected by the optical ghost image. The restriction of the expression is conducive to reducing the threshold of the optical ghost image. At the same time, limiting the outer diameter of the third spacer is conducive to ensuring the bearing width between the third lens and the fourth lens, and ensuring the assembly stability.

[0063] In this 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. This arrangement ensures the curvature of the image side surface of the fourth lens and the convergence of the outgoing light of the optical imaging lens. By limiting d0m, it is possible to prevent the outgoing light of the optical imaging lens from being reflected at a certain angle on the color filter and the inclined surface of the exit hole of the lens barrel, thereby generating serious lens stray light, thereby preventing stray light from affecting the imaging quality.

[0064] In this embodiment, the maximum axial height L of the lens barrel and the sum of the air gaps ∑AT between the adjacent lenses from the first lens to the fourth lens on the optical axis satisfy: 2.19≤L / ∑AT≤5.54. This setting limits the ratio of the 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 center thickness of each lens, ensures the stability of the air gap before and after the optical imaging lens is baked, and ensures the optical performance of the optical imaging lens.

[0065] In this embodiment, the first lens has negative focal power, the second lens has positive focal power, and the third lens has positive focal power; the object side surface of the first lens is concave, and the image side surface is concave; the object side surface of the second lens is concave, and the image side surface is convex; the object side surface of the third lens is concave, and the image side surface is convex; the object side surface of the fourth lens is concave, and the image side surface is convex. By reasonably constraining the focal power and surface shape of each lens, it is helpful to reasonably constrain the light trend, ensure a smooth transition of light, correct aberrations, and ensure imaging quality.

[0066] In this embodiment, each lens can be selected as a trimmed lens. The outer diameter surface of the trimmed lens has a trimmed structure and a non-trimmed structure, and the outer diameter of the trimmed structure is smaller than the outer diameter of the non-trimmed structure. The outer diameter of the trimmed lens usually refers to the outer diameter of the non-trimmed structure.

[0067] In this embodiment, each spacer can be selected as a trimming spacer. The outer annular surface of the trimming spacer has a trimming portion and a non-trimming portion, and the outer diameter of the trimming portion is smaller than the outer diameter of the non-trimming portion. The outer diameter of the trimming spacer usually refers to the maximum outer diameter of the non-trimming portion.

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

[0069] In addition, in another optional embodiment of the present application, Figures 1 to 28As shown, an optical imaging lens is also provided, comprising a lens barrel, a lens group and at least one spacer arranged in the lens barrel, the lens group consists of four lenses, and the four lenses are, from the object side to the image side, a first lens with negative optical focal length, a second lens with positive optical focal length, a third lens with positive optical focal length and a fourth lens with optical focal length; 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; the object side surface of the fourth lens is a concave surface, and the image side surface is a convex surface; the at least one spacer includes a spacer placed between the first lens and the second lens and A first spacer in contact with the image side surface portion of the first lens, and a second spacer placed between the second lens and the third lens and in contact with the image side surface portion of the second 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 effective focal length f1 of the first lens, the center 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 is composed of a lens barrel, four lenses arranged in the lens barrel, and at least one spacer. By reasonably arranging the optical focal length and surface shape of the four lenses, the positions of the first spacer and the second spacer, and setting the optical imaging lens to meet: -5.09≤R1×N1 / d1s≤-2.32, the refractive index of the first lens is guaranteed, and the optical imaging lens is guaranteed to have no light leakage problems while meeting a large field of view. However, in this case, the first spacer is prone to bending, offset, etc. after assembly, resulting in poor assembly stability of the front-end structure. Therefore, the present application guarantees the edge thickness of the first lens and the glue dispensing space of the optical imaging lens by constraining -2.18≤f1 / (EP01+CT1)≤-1.25, guarantees the molding feasibility of the first lens, guarantees the assembly stability of the front-end lens, and can prevent appearance problems such as glue overflow. By limiting the effective focal length of the first lens, the curvature of the first lens is guaranteed, and the accurate transmission of light is guaranteed.

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

[0072] In addition, in another optional embodiment of the present application, Figures 1 to 28As shown, an optical imaging lens is also provided, comprising a lens barrel, a lens group and at least one spacer arranged in the lens barrel, the lens group consisting of four lenses, the four lenses being, from the object side to the image side, a first lens with negative optical power, a second lens with positive optical power, a third lens with positive optical power and a fourth lens with 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; the object side surface of the fourth lens is a concave surface, and the image side surface is a convex surface; the at least one spacer includes a spacer disposed on the first lens A first spacer is placed between the mirror and the second lens and in contact with the image side surface of the first lens, a second spacer is placed between the second lens and the third lens and in contact with the image side surface of the second lens, and a third spacer is placed between the third lens and the fourth lens and 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 is composed of a lens barrel, four lenses arranged in the lens barrel, and at least one spacer. By reasonably arranging the optical focal length and surface shape of the four lenses, the positions of the first spacer to the third spacer, and setting the optical imaging lens to satisfy -2.17≤f1 / d1s≤-0.89 and 1.44≤D3s / d3s≤3.30, it is beneficial for the first spacer to intercept stray light at the edge of the first lens, thereby reducing stray light. At the same time, the rationality of the size of the third spacer can be ensured, the structural strength of the third spacer can be ensured, and the bearing stability with the third lens can be ensured.

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

[0075] Optionally, the optical imaging lens may further include a protective glass for protecting a 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 may use multiple lenses, such as the four lenses mentioned above. In the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The characteristics of an aspherical lens are: the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After using an 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, without departing from the technical solution claimed in the present application, the number of lenses constituting the optical imaging lens can be changed to obtain the various results and advantages described in this specification. For example, although four lenses are described as an example in the embodiments, the optical imaging lens is not limited to including four lenses. If necessary, the optical imaging lens may also include other numbers of lenses.

[0078] Figure 1 A schematic diagram of the dimensions of an optical imaging lens of the present application is shown. Figure 1 Parameters such as D1s, D2s, D3s, d1s, d0m, D3m, d3s, CP1, CP2, EP01, EP12, EP23, and L 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 will no longer be reflected in the drawings when describing the specific embodiments later.

[0079] The following further describes examples of specific surface shapes and parameters of the optical imaging lens applicable to the above-mentioned embodiments with reference to the accompanying drawings.

[0080] It should be noted that in the following embodiment 1, there are two examples of embodiment 1-1 and embodiment 1-2, in embodiment 2, there are two examples of embodiment 2-1 and embodiment 2-2, in embodiment 3, there are two examples of embodiment 3-1 and embodiment 3-2, and in embodiment 4, there are two examples of embodiment 4-1 and embodiment 4-2. In the two examples of the same embodiment, the parameters such as the radius of curvature, center thickness, and the spacing distance between the lenses and the coefficients of high-order terms of the optical imaging lens are the same, but the parameters such as the thickness, inner diameter, and outer diameter of each lens barrel and the first to third spacers are different. In other words, the main structure for imaging is the same, but the auxiliary structure for imaging is different.

[0081] It should be noted that any one of the following embodiments 1 to 4 is applicable to all implementation methods of the present application.

[0082] Embodiment 1

[0083] like Figures 2 to 7 As shown, the optical imaging lens of the first embodiment is described. Figure 2 FIG. 1 is a schematic diagram showing the structure of the optical imaging lens of Example 1-1. Figure 3 A schematic structural diagram of the optical imaging lens of Embodiment 1-2 is shown.

[0084] like Figure 2 and Figure 3As shown, the optical imaging lens includes a lens barrel P0 and 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, which are arranged in the lens barrel P0 in sequence from the object side to the image side along the optical axis.

[0085] like Figure 2 , which is a schematic diagram of the structure of the optical imaging lens of Example 1-1. In this example, the object side surface and image side surface of the first spacer P1 are respectively in contact with the image side surface S2 of the first lens and the object side surface of the first auxiliary spacer P1b. The image side surface of the first auxiliary spacer P1b is partially in contact with the object side surface S3 of the second lens. The object side surface and image side surface of the second spacer P2 are respectively in contact with the image side surface S4 of the second lens and the object side surface S5 of the third lens. The object side surface and image side surface of the third spacer P3 are respectively in contact with the image side surface S6 of the third lens and the object side surface S7 of the fourth lens.

[0086] like Figure 3 FIG. 1 is a schematic diagram of the structure of the optical imaging lens of Example 1-2. In this example, the supporting and abutting manner of each spacer is the same as that of Example 1-1, and the relevant description in Example 1-1 may be referred to, and will not be repeated here.

[0087] In summary, the structural parameters of the optical imaging lens of Example 1 in Example 1-1 and Example 1-2 are shown in Table 2.

[0088] (Unit: mm)

[0089] Table 2

[0090]

[0091]

[0092] In the first embodiment, 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 first embodiment, 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 structural parameters of the optical imaging lens of Example 1, wherein the units of the radius of curvature and thickness / distance are all millimeters.

[0095] Table 3

[0096]

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

[0098]

[0099] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R, that is, the paraxial curvature c is the reciprocal of the curvature radius R in the above Table 1; k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. The following Table 4 gives the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, and A28 that can be used for each aspheric mirror surface S1-S8 in Example 1.

[0100] Table 4

[0101]

[0102]

[0103] Figure 4 The axial chromatic aberration curve of the optical imaging lens of the first embodiment is shown, which indicates the deviation of the focusing point of light rays of different wavelengths after passing through the imaging lens. Figure 5 The astigmatism curve of the optical imaging lens of the first embodiment is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 6 The distortion curve of the optical imaging lens of the first embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles. Figure 7 The magnification chromatic aberration curve of the optical imaging lens of the first embodiment is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging lens.

[0104] according to Figures 4 to 7 It can be seen that the optical imaging lens provided in the first embodiment can achieve good imaging quality.

[0105] Embodiment 2

[0106] like Figures 8 to 13 As shown, the optical imaging lens of the second embodiment is described. Figure 8 A schematic diagram of the structure of the optical imaging lens of Example 2-1 is shown. Fig. 9 A schematic structural diagram of the optical imaging lens of Example 2-2 is shown.

[0107] like Figure 8 and Fig. 9 As shown, the optical imaging lens includes a lens barrel P0 and 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, which are arranged in the lens barrel P0 in sequence from the object side to the image side along the optical axis.

[0108] like Figure 8 As shown, it is a schematic diagram of the structure of the optical imaging lens of Example 2-1. In this example, a second auxiliary spacer P2b is also provided on the image side of the second spacer P2. The object side surface and image side surface of the first spacer P1 are respectively in contact with the image side surface S2 of the first lens and the object side surface S3 of the second lens. The object side surface and image side surface of the second spacer P2 are respectively in contact with the image side surface S4 of the second lens and the object side surface of the second auxiliary spacer P2b, and the image side surface of the second auxiliary spacer P2b is respectively in contact with the object side surface S5 of the third lens. The object side surface and image side surface of the third spacer P3 are respectively in contact with the image side surface S6 of the third lens and the object side surface of the third auxiliary spacer P3b, and the image side surface of the third auxiliary spacer P3b is respectively in contact with the object side surface S7 of the fourth lens.

[0109] like Fig. 9 , which is a schematic diagram of the structure of the optical imaging lens of Example 2-2. The difference between this example and Example 2-1 is that the second auxiliary spacer P2b is not provided. The object side and image side of the second spacer P2 are respectively abutted against the image side S4 of the second lens and the object side S5 of the third lens. The abutment method of the remaining spacers is the same as that of Example 2-1, and the relevant description in Example 2-1 can be referred to, which will not be repeated here.

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

[0111] (Unit: mm)

[0112] Table 5

[0113] Parameters / Examples 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 the second embodiment, 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.

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

[0116] Table 6 shows a basic structural parameter table of the optical imaging lens of Example 2, wherein the units of the radius of curvature and thickness / distance are all millimeters.

[0117] Table 6

[0118]

[0119]

[0120] Table 7 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, and A28 that can be used for the aspherical mirror surfaces S1-S8 in Example 2.

[0121] Table 7

[0122]

[0123] Fig.10 The axial chromatic aberration curve of the optical imaging lens of the second embodiment is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the imaging lens. Fig.11 The astigmatism curve of the optical imaging lens of the second embodiment is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.12 The distortion curve of the optical imaging lens of the second embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles. Fig.13 The magnification chromatic aberration curve of the optical imaging lens of the second embodiment is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging lens.

[0124] according to Figures 10 to 13 It can be seen that the optical imaging lens provided in the second embodiment can achieve good imaging quality.

[0125] Embodiment 3

[0126] like Figures 14 to 19 As shown, the optical imaging lens of embodiment 3 is described. Fig.14 FIG. 3 is a schematic diagram showing the structure of the optical imaging lens of Example 3-1. Fig.15 A schematic structural diagram of the optical imaging lens of Example 3-2 is shown.

[0127] like Fig.14 and Fig.15As shown, the optical imaging lens includes a lens barrel P0 and 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 which are sequentially arranged in the lens barrel P0 from the object side to the image side along the optical axis.

[0128] like Fig.14 , which is a schematic diagram of the structure of the optical imaging lens of Example 3-1. The object side surface and image side surface of the first spacer P1 are respectively in contact with the image side surface S2 of the first lens and the object side surface S3 of the second lens. The object side surface and image side surface of the second spacer P2 are respectively in contact with the image side surface S4 of the second lens and the object side surface S5 of the third lens. The object side surface and image side surface of the third spacer P3 are respectively in contact with the image side surface S6 of the third lens and the object side surface S7 of the fourth lens.

[0129] like Fig.15 FIG. 3 is a schematic diagram of the structure of the optical imaging lens of Example 3-2. In this example, the supporting and abutting manner of each spacer is the same as that of Example 3-1, and the relevant description in Example 3-1 may be referred to, and will not be repeated here.

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

[0131] (Unit: mm)

[0132] Table 8

[0133] Parameters / Examples 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 the third embodiment, 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 the third embodiment, 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 a basic structural parameter table of the optical imaging lens of Example 3, wherein the units of the radius of curvature and thickness / distance are both millimeters.

[0137] Table 9

[0138]

[0139]

[0140] Table 10 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, and A28 that can be used for the aspheric mirror surfaces S1-S8 in Example 3.

[0141] Table 10

[0142]

[0143] Fig.16 The axial chromatic aberration curve of the optical imaging lens of the third embodiment is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the imaging lens. Fig.17 The astigmatism curve of the optical imaging lens of the third embodiment is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.18 The distortion curve of the optical imaging lens of the third embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles. Fig.19 The magnification chromatic aberration curve of the optical imaging lens of Example 3 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging lens.

[0144] according to Figures 16 to 19 It can be seen that the optical imaging lens provided in the third embodiment can achieve good imaging quality.

[0145] Embodiment 4

[0146] like Figure 20 to Figure 25 As shown, the optical imaging lens of Example 4 is described. Fig. 20 FIG. 4 is a schematic diagram showing the structure of the optical imaging lens of Example 4-1. Fig.21 A schematic structural diagram of the optical imaging lens of Example 4-2 is shown.

[0147] like Fig. 20 and Fig.21 As shown, the optical imaging lens includes a lens barrel P0 and 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, which are arranged in the lens barrel P0 in sequence from the object side to the image side along the optical axis.

[0148] like Fig. 20, which is a schematic diagram of the structure of the optical imaging lens of Example 4-1. In this example, the object side surface and image side surface of the first spacer P1 are respectively in contact with the image side surface S2 of the first lens and the object side surface S3 of the second lens. The object side surface and image side surface of the second spacer P2 are respectively in contact with the image side surface S4 of the second lens and the object side surface S5 of the third lens. The object side surface and image side surface of the third spacer P3 are respectively in contact with the image side surface S6 of the third lens and the object side surface of the third auxiliary spacer P3b, and the image side surface of the third auxiliary spacer P3b is respectively in contact with the object side surface S7 of the fourth lens.

[0149] like Fig.21 As shown, it is a schematic diagram of the structure of the optical imaging lens of Example 4-2. In this example, a second auxiliary spacer P2b is also provided on the image side of the second spacer P2. At this time, the object side and image side of the second spacer P2 are respectively abutted against the image side S4 of the second lens and the object side of the second auxiliary spacer P2b, and the image side of the second auxiliary spacer P2b is partially abutted against the object side S5 of the third lens. The abutment method of the remaining spacers is the same as that of Example 4-1, and the relevant description in Example 4-1 can be referred to, and no further description is given here.

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

[0151] (Unit: mm)

[0152] Table 11

[0153] Parameters / Examples 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 the fourth embodiment, 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.

[0155] In the fourth embodiment, 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 a basic structural parameter table of the optical imaging lens of Example 4, wherein the units of the radius of curvature and thickness / distance are all millimeters.

[0157] Table 12

[0158]

[0159] Table 13 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, and A28 that can be used for the aspheric mirror surfaces S1-S8 in Example 4.

[0160] Table 13

[0161]

[0162] Fig. 22 The axial chromatic aberration curve of the optical imaging lens of the fourth embodiment is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the imaging lens. Fig.23 The astigmatism curve of the optical imaging lens of Example 4 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.24 The distortion curve of the optical imaging lens of the fourth embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles. Fig.25 The magnification chromatic aberration curve of the optical imaging lens of Example 4 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging lens.

[0163] according to Figure 22 to Figure 25 It can be seen that the optical imaging lens provided in the fourth embodiment can achieve good imaging quality.

[0164] In summary, Embodiments 1 to 4 respectively satisfy the relationships shown in Table 14.

[0165] Table 14

[0166] Conditional / Example 1-1 1-2 2-1 2-2 3-1 3-2 4-1 4-2 R1×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×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 lengths of the lenses of the optical imaging lenses of Examples 1 to 4.

[0168] Table 15

[0169] Parameters / Examples 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, whose electronic photosensitive element can be a photosensitive coupled device (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated in a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

[0171] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0172] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0173] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0174] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An optical imaging lens, characterized in that: comprising a lens barrel, a lens group and at least one spacer disposed in the lens barrel, The lens group is composed of four lenses, and the four lenses are, from the object side to the image side, a first lens, a second lens, a third lens and a fourth lens in sequence; The at least one spacer includes a first spacer disposed between the first lens and the second lens and in contact with the image-side surface portion 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; A curvature radius R2 of the image-side surface of the first lens, an inner diameter d1s of the object-side surface of the first spacer, and an outer diameter D1s of the object-side surface of the first spacer satisfy the following: 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 center thickness CT1 of the first lens on the optical axis, and the on-axis 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 center thickness CT2 of the second lens on the optical axis, and the air interval T12 between 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 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, The effective focal length f2 of the second lens and the axial interval EP12 between the first spacer and the second spacer satisfy the following: 1.41≤f2 / EP12≤4.

90.

5. 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 the image side surface portion of the second lens, An outer diameter D2s of the object-side surface of the second spacer and a 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 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, An air interval T23 between the second lens and the third lens on the optical axis and a maximum axial thickness CP2 of the second spacer satisfy the following: 0.21≤T23 / CP2≤2.

73.

7. 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 the image side surface portion of the third lens, A curvature radius R6 of the image side surface of the third lens, an outer diameter D3s of the object side surface of the third spacer, and an inner diameter d3s of the object side surface of the third spacer satisfy the following: -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 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. 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 the following: 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 the image side surface portion of the third lens, A curvature radius R7 of the object-side surface of the fourth lens, a refractive index N4 of the fourth lens, and an outer diameter D3m of the image-side surface of the third spacer satisfy the following: -1.29≤R7×N4 / D3m≤-0.

47.

10. The optical imaging lens according to claim 1, wherein: A curvature radius R8 of the image side surface of the fourth lens and an inner diameter d0m of the image side end surface of the lens barrel satisfy the following: -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 ΣAT of air intervals between adjacent lenses from the first lens to the fourth lens on the optical axis satisfy the following: 2.19≤L / ΣAT≤5.

54.

12. The optical imaging lens according to any one of claims 1 to 11, characterized in that: The first lens has negative optical power, the second lens has positive optical power, and the third lens has positive optical power; and / or, The object side surface of the first lens is concave, and the image side surface is concave; the object side surface of the second lens is concave, and the image side surface is convex; the object side surface of the third lens is concave, and the image side surface is convex; the object side surface of the fourth lens is concave, and the image side surface is convex.

Images