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 a first lens, a second lens, a third lens and a fourth lens; the at least one spacer comprises a first spacer, a second spacer and a third spacer; cT1 / EP01 is more than or equal to 0.96 and less than or equal to 1.26; r3 / (D1m-d1m) is greater than or equal to-1.69 and less than or equal to-1.11. The problem that stray light is increased due to the fact that a four-piece optical imaging lens in the prior art meets the imaging definition 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 continuous update and iteration of mobile electronic devices, related industries have also ushered in a wave of optimization and upgrading. Among them, the mobile phone industry is the most representative industry. Its development has not only promoted the continuous progress of the optical imaging lenses configured on it, but also promoted the iteration and upgrading of related technologies.

[0003] As users continue to pursue higher quality mobile phone photography, high definition and high picture cleanliness have become key requirements for users. The prior art provides a four-piece optical imaging lens. In order to achieve high imaging clarity, the front end size usually needs to be increased. However, this easily leads to unreasonable matching between the lens barrel size design and the lens size, which results in an increase in stray light and affects the imaging quality and clarity.

[0004] That is to say, the four-piece optical imaging lens in the prior art has the problem of increasing stray light in order to meet the imaging clarity. Summary of the invention

[0005] The main purpose of the present invention is to provide an optical imaging lens to solve the problem of increased stray light caused by insufficient imaging clarity in the four-lens optical imaging lens in the prior art.

[0006] To achieve the above object, 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 order; the at least one spacer comprises 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, 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 center thickness CT1 of the first lens on the optical axis and an axial spacing EP01 between the object side end surface of the lens barrel and the first spacer satisfy the following relationship: 0.96≤CT1 / EP01≤1.26; an outer diameter D1m of the image side surface of the first spacer, an inner diameter d1m of the image side surface of the first spacer and a curvature radius R3 of the object side surface of the second lens satisfy the following relationship: -1.69≤R3 / (D1m-d1m)≤-1.11.

[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, a second lens, a third lens and a fourth lens in order; the first lens has positive focal power, the second lens has negative focal power, the third lens has negative focal power, and the fourth lens has positive focal power; the object side surface of the first lens is convex, and the image side surface is convex; the object side surface of the second lens is concave, and the image side surface is concave; the object side surface of the third lens is concave, and the image side surface is concave; the object side surface of the fourth lens is convex, and the image side surface is concave; the at least one spacer includes a spacer arranged on the first lens A first spacer between the second lens and the second lens and in contact with the image side surface of the first lens, a second spacer 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 placed between the third lens and the fourth lens and in contact with the image side surface of the third 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: 0.96≤CT1 / EP01≤1.26; the curvature radius R6 of the image side surface of the third lens, the inner diameter d3s of the object side surface of the third spacer and the refractive index of the third lens satisfy: 2.30≤d3s / R6×N3≤2.54.

[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, a second lens, a third lens, and a fourth lens in order; the first lens has positive focal power, the second lens has negative focal power, the third lens has negative focal power, and the fourth lens has positive focal power; the object side surface of the first lens is a convex surface, and the image side surface is a convex surface; the object side surface of the second lens is a concave surface, and the image side surface is a concave surface; the object side surface of the third lens is a concave surface, and the image side surface is a concave surface; The object side surface of the fourth lens is convex, and the image side surface is concave; at least one spacer includes a first spacer placed between the first lens and the second lens and partially in contact with the image side surface of the first lens, 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; the inner diameter d0s of the object side end surface of the lens barrel and the axial spacing EP01 between the object side end surface of the lens barrel and the first spacer satisfy the following conditions: 3.43≤d0s / EP01≤4.76.

[0009] Further, a curvature radius R4 of the image-side surface of the second lens and an outer diameter D2s of the object-side surface of the second spacer satisfy the relationship: 2.68≤R4 / D2s≤14.75.

[0010] Furthermore, an outer diameter D2m of the image side surface of the second spacer, an inner diameter d2m of the image side surface of the second spacer, and a curvature radius R5 of the object side surface of the third lens satisfy: -3.51≤R5 / (D2m-d2m)≤-2.32.

[0011] Further, a curvature radius R6 of the image-side surface of the third lens, an inner diameter d3s of the object-side surface of the third spacer, and a refractive index of the third lens satisfy: 2.30≤d3s / R6×N3≤2.54.

[0012] Further, the center thickness CT1 of the first lens on the optical axis, the center thickness CT2 of the second lens on the optical axis, and the maximum thickness CP1 of the first spacer satisfy: 4.53≤(CT1+CP1) / CT2≤6.35.

[0013] Further, the axial interval EP12 between the first spacer and the second spacer and the center thickness CT2 of the second lens on the optical axis satisfy: 2.71≤EP12 / CT2≤3.68.

[0014] Further, an axial interval EP23 between the second spacer and the third spacer and a center thickness CT3 of the third lens on the optical axis satisfy: 2.67≤EP23 / CT3≤3.27.

[0015] Further, the maximum axial height L of the lens barrel, the air interval T12 between the first lens and the second lens on the optical axis, the air interval T23 between the second lens and the third lens on the optical axis, and the air interval T34 between the third lens and the fourth lens on the optical axis satisfy: 6.57≤L / (T12+T23+T34)≤7.21.

[0016] Further, the effective focal length f1 of the first lens and the axial interval EP01 between the object-side end surface of the lens barrel and the first spacer satisfy: 2.38≤f1 / EP01≤3.00.

[0017] Further, the outer diameter D0s of the object side end surface of the lens barrel, the inner diameter d0s of the object side end surface of the lens barrel, and the center thickness CT1 of the first lens on the optical axis satisfy: 0.27≤(D0s-d0s) / CT1≤1.52.

[0018] Furthermore, the inner diameter d0s of the object-side end surface of the lens barrel and the curvature radius R1 of the object-side surface of the first lens satisfy the following relationship: 1.37≤d0s / R1≤1.77.

[0019] Further, a curvature radius R7 of the object side surface of the fourth lens, an outer diameter D3m of the image side surface of the third spacer, and an inner diameter d3m of the image side surface of the third spacer satisfy: 1.14≤(D3m-d3m) / R7≤1.83.

[0020] Further, the axial interval EP12 between the first spacer and the second spacer, the axial interval EP23 between the second spacer and the third spacer, and the effective focal length f2 of the second lens satisfy: -2.25≤f2 / (EP12+EP23)≤-2.01.

[0021] Further, the first lens has positive optical power, the second lens has negative optical power, the third lens has negative optical power, and the fourth lens has positive optical power.

[0022] Furthermore, the object side surface of the first lens is convex, and the image side surface is convex; the object side surface of the second lens is concave, and the image side surface is concave; the object side surface of the third lens is concave, and the image side surface is concave; the object side surface of the fourth lens is convex, and the image side surface is concave.

[0023] By applying the technical solution of the present invention, 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, the first spacer to the third spacer, and setting the optical imaging lens to meet 0.96≤CT1 / EP01≤1.26, the field curvature can be adjusted while improving the system's ability to converge light, improving imaging clarity, and improving the matching degree between the edge field of view CRA and the chip CRA of the optical imaging lens, reducing the risk of color cast. However, in this case, the design size of the front end of the lens barrel is difficult to match the size of the first lens, resulting in an increase in stray light. Therefore, the present application can effectively eliminate the problems of defocus, chromatic aberration, and distortion caused by air spacing by constraining -1.69≤R3 / (D1m-d1m)≤-1.11, and at the same time intercept the invalid light path reflected by the first lens and its object side parts, which is conducive to intercepting stray light, improving optical performance, reducing stray light spots, and improving imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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:

[0025] Figure 1 A dimensioning diagram of an optical imaging lens according to an optional embodiment of the present invention is shown;

[0026] Figure 2 A schematic structural diagram of an optical imaging lens according to Embodiment 1-1 of the present invention is shown;

[0027] Figure 3 A schematic structural diagram of an optical imaging lens according to Embodiment 1-2 of the present invention is shown;

[0028] Figures 4 to 7 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging lens of the first embodiment of the present invention are respectively shown;

[0029] Figure 8 A schematic structural diagram of an optical imaging lens according to Embodiment 2-1 of the present invention is shown;

[0030] Fig. 9 A schematic structural diagram of an optical imaging lens according to Embodiment 2-2 of the present invention is shown;

[0031] 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;

[0032] Fig.14 A schematic structural diagram of an optical imaging lens according to Embodiment 3-1 of the present invention is shown;

[0033] Fig.15 A schematic structural diagram of an optical imaging lens according to Embodiment 3-2 of the present invention is shown;

[0034] 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;

[0035] Fig. 20 A schematic structural diagram of an optical imaging lens according to Embodiment 4-1 of the present invention is shown;

[0036] Fig.21 A schematic structural diagram of an optical imaging lens according to Embodiment 4-2 of the present invention is shown;

[0037] Figure 22 to Figure 25 The 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;

[0038] Fig.26 and Fig. 27 The stray light optical path diagram and the stray light energy diagram of an optional example optical imaging lens are respectively shown when CT1 / EP01=0.96 and R3 / (D1m-d1m)=-1.72;

[0039] Fig.28 and Fig.29 The stray light optical path diagram and the stray light energy diagram of an optional example optical imaging lens are respectively shown when CT1 / EP01=0.96 and R3 / (D1m-d1m)=-0.96;

[0040] Fig.30A stray light energy diagram is shown when the optical imaging lens of an optional embodiment of the present invention satisfies CT1 / EP01=0.96 and R3 / (D1m-d1m)=-1.11.

[0041] The above drawings include the following reference numerals:

[0042] 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

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] In order to solve the problem that the four-lens optical imaging lens in the prior art has an increase in stray light due to insufficient imaging clarity, the present invention provides an optical imaging lens.

[0050] like Figures 1 to 30 As shown, in an optional embodiment of the present application, the optical imaging lens includes 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, 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; the 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, 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; 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: 0.96≤CT1 / EP01≤1.26; the outer diameter D1m of the image side surface of the first spacer, the inner diameter d1m of the image side surface of the first spacer and the curvature radius R3 of the object side surface of the second lens satisfy: -1.69≤R3 / (D1m-d1m)≤-1.11.

[0051] 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, the first spacer to the third spacer, and setting the optical imaging lens to meet 0.96≤CT1 / EP01≤1.26, it is possible to adjust the field curvature while improving the system's ability to converge light, improve imaging clarity, and improve the matching degree between the edge field of view CRA and the chip CRA of the optical imaging lens, thereby reducing the risk of color cast. However, in this case, the design size of the front end of the lens barrel is difficult to match the size of the first lens, resulting in an increase in stray light. Therefore, the present application can effectively eliminate the problems of defocus, chromatic aberration, and distortion caused by air spacing by constraining -1.69≤R3 / (D1m-d1m)≤-1.11, and at the same time intercept the invalid light path reflected by the first lens and its object side parts, which is conducive to intercepting stray light, improving optical performance, reducing stray light spots, and improving imaging quality.

[0052] In addition, refer to Table 1 and Figures 26 to 30 As shown, under the premise that the optical imaging lens satisfies CT1 / EP01=0.96, Fig.26 and Fig. 27 The stray light path diagram and stray light energy diagram are shown respectively when the optical imaging lens satisfies R3 / (D1m-d1m)=-1.72, Fig.28 and Fig.29 The stray light path diagram and stray light energy diagram are shown respectively when the optical imaging lens satisfies R3 / (D1m-d1m)=-0.96, Fig.30 The stray light energy diagram is shown when the optical imaging lens satisfies R3 / (D1m-d1m)=-1.11.

[0053] Depend on Figures 26 to 30It can be seen that when R3 / (D1m-d1m)=-1.72, more stray light rays are not intercepted after multiple reflections, and enter the imaging surface to form stray light spots, and the stray light energy is more obvious, and the performance is poor. When R3 / (D1m-d1m)=-0.96, some stray light rays are not intercepted after multiple reflections, and enter the imaging surface to form stray light spots, and the stray light energy diagram is poor. When R3 / (D1m-d1m)=-1.11, the first spacer can effectively intercept the stray light generated by the front end, intercept the invalid light path reflected by the lens and its object side parts, reduce the stray light spots, and perform better. It can be seen that when R3 / (D1m-d1m) is in the range of -1.69 to -1.11, the stray light improvement effect of the optical imaging lens is best. Therefore, the present application reasonably constrains the outer diameter of the image side surface of the first spacer, the inner diameter of the image side surface of the first spacer, and the curvature radius of the object side surface of the second lens by constraining -1.69≤R3 / (D1m-d1m)≤-1.11, which can effectively eliminate the problems of defocus, chromatic aberration and distortion caused by the air gap, and at the same time intercept the invalid optical path of the light reflected by the first lens and its object side components, effectively intercept the stray light, improve the optical performance, reduce the stray light spot, and improve the imaging quality.

[0054] Table 1

[0055] Conditional expression R3 / (D1m-d1m)=-1.72 R3 / (D1m-d1m)=-0.96 R3 / (D1m-d1m)=-1.11 Evaluation chart Fig.26 and Fig. 27 Fig.28 and Fig.29 Fig.30

[0056] In this embodiment, the curvature radius R4 of the image side surface of the second lens and the outer diameter D2s of the object side surface of the second spacer satisfy: 2.68≤R4 / D2s≤14.75. By controlling the above conditional expression, it is beneficial to reduce the processing angle of the curvature radius of the image side surface of the second lens, which is beneficial to the processing and molding of the second lens, and by controlling the outer diameter of the object side surface of the second spacer, a stable step difference can be obtained, and it can also ensure that the optical imaging lens has the characteristics of small size and high image quality.

[0057] In this embodiment, the outer diameter D2m of the image side surface of the second spacer, the inner diameter d2m of the image side surface of the second spacer and the curvature radius R5 of the object side surface of the third lens satisfy: -3.51≤R5 / (D2m-d2m)≤-2.32. By controlling this condition, the smoothness and formability of the optically effective surface of the third lens, that is, the aspheric surface of the third lens used to transmit effective light, can be improved, and it can be ensured that the third lens does not have a large curved surface shape, thereby improving the imaging quality; at the same time, controlling the inner and outer diameters of the image side surface of the second spacer is conducive to improving the light blocking efficiency of the second spacer and reducing the risk of stray light.

[0058] In this embodiment, the curvature radius R6 of the image side surface of the third lens, the inner diameter d3s of the object side surface of the third spacer and the refractive index of the third lens satisfy: 2.30≤d3s / R6×N3≤2.54. By controlling this condition, the MTF performance of the lens group after assembly can be greatly improved, and the distortion and aberration of the aspheric lens can be reduced, thereby improving the imaging effect; in addition, by controlling the inner diameter of the object side surface of the third spacer, the stray light path can be effectively blocked, reducing the risk of stray light.

[0059] In this embodiment, the center thickness CT1 of the first lens on the optical axis, the center thickness CT2 of the second lens on the optical axis, and the maximum thickness CP1 of the first spacer satisfy: 4.53≤(CT1+CP1) / CT2≤6.35. By controlling this condition, it is ensured that the center thickness of the first lens and the second lens can be in a relatively reasonable range. In addition, the maximum thickness of the lens with the maximum center thickness of the optical imaging lens and the maximum thickness of the spacer in contact with the lens are controlled to avoid assembly interference and facilitate the later adjustment of field curvature.

[0060] In this embodiment, the axial spacing EP12 between the first spacer and the second spacer and the center thickness CT2 of the second lens on the optical axis satisfy: 2.71≤EP12 / CT2≤3.68. By controlling the above formula, it is helpful to ensure that the center thickness and edge thickness of the second lens can be in a relatively reasonable range, reduce the risk of weld marks during molding of the second lens, thereby reducing the risk of stray light caused by weld marks, improve the cleanliness of the imaging of the optical imaging lens, reduce the demolding force when the plastic lens is demolded after molding, reduce the risk of the surface shape deviating from the design curve due to lens demolding deformation, and improve the MTF quality of the optical imaging lens.

[0061] In this embodiment, the axial spacing EP23 between the second spacer and the third spacer and the center thickness CT3 of the third lens on the optical axis satisfy: 2.67≤EP23 / CT3≤3.27. By controlling this condition, it is ensured that the center thickness and edge thickness of the third lens can be in a relatively reasonable range, reducing the risk of weld marks during molding of the third lens, thereby reducing the risk of stray light caused by weld marks, which is conducive to improving the cleanliness of imaging.

[0062] In this embodiment, the maximum axial height L of the lens barrel, the air interval T12 between the first lens and the second lens on the optical axis, the air interval T23 between the second lens and the third lens on the optical axis, and the air interval T34 between the third lens and the fourth lens on the optical axis satisfy: 6.57≤L / (T12+T23+T34)≤7.21. The maximum axial height L of the lens barrel is specifically the axial distance from the object side end face of the lens barrel to the image side end face of the lens barrel. By controlling this condition, it is beneficial to the stability of the air interval between the lens and its adjacent lens on the optical axis, and it is within a reasonable range, which is beneficial to improving the assembly stability and consistency, and is more conducive to adjusting the field curvature and improving the performance; at the same time, the maximum axial height of the lens barrel can be controlled, which further helps the overall design of the optical imaging lens and better takes into account the characteristics of small size.

[0063] In this embodiment, the effective focal length f1 of the first lens and the axial spacing EP01 between the object side end surface of the lens barrel and the first spacer satisfy: 2.38≤f1 / EP01≤3.00. By controlling this condition, the dispersion phenomenon of the first lens can be reduced and the pixel can be improved; at the same time, by using this conditional formula, the edge thickness of the first lens and the effective focal length of the first lens can be controlled, which is conducive to controlling the size of the front-end structure and avoiding the situation where the size of the front-end structure is too large. At the same time, it is conducive to balancing the rear focal length of the optical imaging lens, ensuring that the rear focal length can reach a relatively stable imaging focal plane position, and ensuring that the optical imaging lens has better stability during use.

[0064] In this embodiment, the outer diameter D0s of the object side end surface of the lens barrel, the inner diameter d0s of the object side end surface of the lens barrel and the center thickness CT1 of the first lens on the optical axis satisfy: 0.27≤(D0s-d0s) / CT1≤1.52. By controlling this condition, it is beneficial to the overall head design of the optical imaging lens, so that it can take into account the characteristics of the small head, and at the same time, it can effectively control the incident light and reduce the risk of stray light there; in addition, controlling the center thickness of the first lens is beneficial to reducing the risk of its weld line and improving the imaging quality.

[0065] In this embodiment, the inner diameter d0s of the object side end surface of the lens barrel and the curvature radius R1 of the object side surface of the first lens satisfy: 1.37≤d0s / R1≤1.77. By controlling the above relationship, the amount of light entering the optical imaging lens can be significantly improved, and at the same time, the rationality of the surface shape of the object side surface of the first lens can be ensured, and the interference between the first lens and the lens barrel can be avoided, which is beneficial to improving the relative illumination of the optical imaging lens and the field of view.

[0066] In this embodiment, the curvature radius R7 of the object side surface of the fourth lens, the outer diameter D3m of the image side surface of the third spacer, and the inner diameter d3m of the image side surface of the third spacer satisfy: 1.14≤(D3m-d3m) / R7≤1.83. By controlling this condition, the light blocking efficiency of the third spacer can be effectively improved. Furthermore, when the apertures of the object side and the image side of the third spacer are within this range, the risks of baking deformation and assembly eccentricity of the third spacer can be greatly reduced, and the generation of light leakage and stray light caused by deformation of the spacer and assembly eccentricity can be reduced; in addition, by this conditional expression, the smoothness and formability of the optically effective surface of the fourth lens can be improved, and the imaging quality can be improved.

[0067] In this embodiment, the axial spacing EP12 between the first spacer and the second spacer, the axial spacing EP23 between the second spacer and the third spacer and the effective focal length f2 of the second lens satisfy: -2.25≤f2 / (EP12+EP23)≤-2.01. By controlling this condition, it is beneficial to reduce the processing angle of the curvature radius of the second lens and the third lens, which is beneficial to processing and molding; it is also beneficial to control the effective focal length of the second lens and the design of the field of view; at the same time, controlling EP12 and EP23 to satisfy the above relationship is beneficial to the control of the edge thickness of the second lens and the third lens.

[0068] In this embodiment, the first lens has positive focal power, the second lens has negative focal power, the third lens has negative focal power, and the fourth lens has positive focal power. By reasonably constraining the focal power of each lens, it is helpful to reasonably constrain the light trend, ensure smooth transition of light, balance the front and rear aberrations, and ensure imaging quality.

[0069] In this embodiment, the object side surface of the first lens is convex, and the image side surface is convex; the object side surface of the second lens is concave, and the image side surface is concave; the object side surface of the third lens is concave, and the image side surface is concave; the object side surface of the fourth lens is convex, and the image side surface is concave. By reasonably constraining the surface shape of each lens, it is helpful to reasonably constrain the light deflection angle, ensure smooth transition of light, correct aberrations, improve distortion, and ensure imaging quality.

[0070] 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.

[0071] In addition, in another optional embodiment of the present application, an optical imaging lens is also provided, including 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, from the object side to the image side, a first lens, a second lens, a third lens and a fourth lens in order; the first lens has positive focal power, the second lens has negative focal power, the third lens has negative focal power, and the fourth lens has positive focal power; the object side surface of the first lens is convex, and the image side surface is convex; the object side surface of the second lens is concave, and the image side surface is concave; the object side surface of the third lens is concave, and the image side surface is concave; the object side surface of the fourth lens is convex, and the image side surface is concave; at least one spacer includes a spacer placed A first spacer between the first lens and the second lens and in contact with the image side surface of the first lens, a second spacer between the second lens and the third lens and in contact with the image side surface of the second lens, and a third spacer between the third lens and the fourth lens and in contact with the image side surface of the third 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: 0.96≤CT1 / EP01≤1.26; the curvature radius R6 of the image side surface of the third lens, the inner diameter d3s of the object side surface of the third spacer and the refractive index of the third lens satisfy: 2.30≤d3s / R6×N3≤2.54.

[0072] 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, the first spacer to the third spacer and setting the optical imaging lens to meet 0.96≤CT1 / EP01≤1.26, it is possible to adjust the field curvature while improving the system's ability to converge light, improve imaging clarity, and improve the matching degree between the edge field of view CRA and the chip CRA of the optical imaging lens, thereby reducing the risk of color cast. However, in this case, the design size of the front end of the lens barrel is difficult to match the size of the first lens, resulting in an increase in stray light. Therefore, the present application can greatly improve the MTF performance of the lens group after assembly by constraining 2.30≤d3s / R6×N3≤2.54, and at the same time can reduce the distortion and aberration of the aspheric lens, thereby improving the imaging effect; in addition, by controlling the inner diameter of the side surface of the third spacer, the stray light path can be effectively blocked to reduce the risk of stray light.

[0073] Of course, this embodiment may also include other parameter formulas in the above embodiment, which will not be described one by one here.

[0074] In addition, in another optional embodiment of the present application, an optical imaging lens is also provided, including 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, from the object side to the image side, a first lens, a second lens, a third lens and a fourth lens in order; the first lens has positive focal power, the second lens has negative focal power, the third lens has negative focal power, and the fourth lens has positive focal power; the object side surface of the first lens is a convex surface, and the image side surface is a convex surface; the object side surface of the second lens is a concave surface, and the image side surface is a concave surface; the object side surface of the third lens is a concave surface, and the image side surface is a concave surface is a concave surface; the object side surface of the fourth lens is a convex surface, and the image side surface is a concave surface; at least one spacer includes 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, 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, and a third spacer placed between the third lens and the fourth lens and in contact with the image side surface portion of the third lens; the inner diameter d0s of the object side end surface of the lens barrel and the axial spacing EP01 between the object side end surface of the lens barrel and the first spacer satisfy the following: 3.43≤d0s / EP01≤4.76.

[0075] 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 to third spacers and setting the optical imaging lens to satisfy 3.43≤d0s / EP01≤4.76, it can be ensured that sufficient light enters the lens barrel, which is beneficial to ensuring imaging clarity. At the same time, the thickness of the front-end structure can be constrained to avoid the situation where the front-end structure is too large to cause physical interference in the assembly, which is beneficial to avoiding the situation where new stray light appears in the front-end structure, thereby ensuring the imaging quality.

[0076] Optionally, the optical imaging lens may further include a protective glass for protecting a photosensitive element located on the imaging surface.

[0077] 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.

[0078] 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.

[0079] Figure 1 A schematic diagram of the dimensions of an optical imaging lens of the present application is shown. Figure 1 Parameters such as D0s, D2s, d0s, d3s, d3m, d2m, d1m, D1m, D3m, EP01, EP12, EP23, CP1, 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 the specific embodiments are described later.

[0080] 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.

[0081] 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 the 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.

[0082] It should be noted that any one of the following embodiments 1 to 4 is applicable to all implementation methods of the present application.

[0083] Embodiment 1

[0084] 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.

[0085] 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 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 from the object side to the image side.

[0086] 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 in partial contact 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 image side surface of the second spacer P2 are in partial contact 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 image side surface of the third spacer P3 are in partial contact with the image side surface S6 of the third lens and the object side surface S7 of the fourth lens, respectively.

[0087] 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.

[0088] 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.

[0089] Table 2

[0090]

[0091]

[0092] In the first embodiment, the object side surface S1 of the first lens is a convex surface, and the image side surface S2 of the first lens is a convex 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 concave 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 concave surface. The object side surface S7 of the fourth lens is a convex surface, and the image side surface S8 of the fourth lens is a concave surface.

[0093] In the first embodiment, the effective focal length f1 of the first lens is 3.99 mm, the effective focal length f2 of the second lens is -3.91 mm, the effective focal length f3 of the third lens is -2.63 mm, and the effective focal length f4 of the fourth lens is 2.57 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, A28, and A30 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. 9As 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 arranged in the lens barrel P0 from the object side to the image side.

[0108] like Figure 8 , which is a schematic diagram of the structure of the optical imaging lens of Example 2-1. In this example, the object side surface and image side surface of the first spacer P1 are in partial contact 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 image side surface of the second spacer P2 are in partial contact 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 image side surface of the third spacer P3 are in partial contact with the image side surface S6 of the third lens and the object side surface S7 of the fourth lens, respectively.

[0109] like Fig. 9 FIG. 2 is a schematic diagram of the structure of the optical imaging lens of Example 2-2. In this example, the supporting and abutting manner of each spacer is the same as that of Example 2-1, and the relevant description in Example 2-1 may be referred to, and 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] Table 5

[0112]

[0113]

[0114] In the second embodiment, the object side surface S1 of the first lens is a convex surface, and the image side surface S2 of the first lens is a convex 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 concave 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 concave surface. The object side surface S7 of the fourth lens is a convex surface, and the image side surface S8 of the fourth lens is a concave surface.

[0115] In the second embodiment, the effective focal length f1 of the first lens is 3.84 mm, the effective focal length f2 of the second lens is -4.12 mm, the effective focal length f3 of the third lens is -2.66 mm, and the effective focal length f4 of the fourth lens is 2.72 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] Table 7 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for the aspheric mirror surfaces S1-S8 in Example 2.

[0120] Table 7

[0121] Face number A4 A6 A8 A10 A12 A14 A16 S1 -3.98E-02 -1.61E-02 -3.80E-03 -4.98E-04 -4.44E-05 8.51E-05 3.24E-05 S2 2.49E-01 -2.99E-02 2.82E-03 1.33E-03 -4.83E-04 6.99E-04 -3.43E-04 S3 4.55E-01 -1.90E-02 9.61E-04 3.85E-03 -1.98E-03 1.64E-03 -1.09E-03 S4 -7.89E-02 1.74E-02 -1.54E-02 7.39E-03 -3.16E-03 2.31E-03 -1.42E-03 S5 3.31E-01 7.26E-04 -1.26E-02 8.65E-03 -4.76E-03 3.02E-03 -1.42E-03 S6 -3.62E-01 9.00E-02 -3.05E-02 1.33E-02 -5.62E-03 2.32E-03 -8.63E-04 S7 -5.38E-01 8.57E-02 -2.45E-02 8.26E-03 -2.65E-03 9.78E-04 -2.93E-04 S8 2.93E-02 -5.82E-03 -1.05E-03 7.58E-05 1.65E-04 -5.23E-05 4.95E-05 Face number A18 A20 A22 A24 A26 A28 A30 S1 1.68E-05 5.21E-06 6.64E-06 7.17E-06 4.23E-06 2.09E-06 1.92E-06 S2 2.67E-04 -1.25E-04 8.77E-05 -5.18E-05 1.80E-06 -1.78E-06 -3.94E-06 S3 8.11E-04 -5.87E-04 3.77E-04 -2.77E-04 1.28E-04 -4.71E-05 1.66E-05 S4 7.23E-04 -1.10E-03 7.37E-04 -4.84E-04 1.40E-04 8.34E-05 -4.67E-06 S5 5.98E-04 -8.84E-04 5.18E-04 -3.48E-04 6.33E-05 6.31E-05 1.52E-05 S6 3.84E-04 -2.20E-04 9.39E-05 -6.09E-05 1.27E-05 -1.27E-05 1.21E-06 S7 1.25E-04 -4.51E-05 1.87E-05 -1.11E-05 2.32E-06 -1.47E-06 -2.01E-07 S8 -8.52E-06 8.76E-06 -1.58E-06 2.15E-07 -2.59E-07 1.09E-07 -9.25E-07

[0122] 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.

[0123] 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.

[0124] Embodiment 3

[0125] 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.

[0126] like Fig.14 and Fig.15 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, and a fourth lens E4 arranged in the lens barrel P0 from the object side to the image side.

[0127] like Fig.14 , which is a schematic diagram of the structure of the optical imaging lens of Example 3-1. In this example, the object side surface and image side surface of the first spacer P1 are in partial contact 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 image side surface of the second spacer P2 are in partial contact 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 image side surface of the third spacer P3 are in partial contact with the image side surface S6 of the third lens and the object side surface S7 of the fourth lens, respectively.

[0128] 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.

[0129] 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.

[0130] Table 8

[0131] Parameters / Examples 3-1 3-2 d1m(mm) 4.265 4.246 D1m(mm) 6.440 5.890 d2m(mm) 3.906 3.857 D2s(mm) 6.540 5.790 D2m(mm) 6.540 5.790 d3s(mm) 3.566 3.592 d3m(mm) 3.566 3.592 D3m(mm) 6.640 5.690 d0s(mm) 5.543 6.485 D0s(mm) 7.559 7.693 CP1(mm) 0.016 0.014 EP01(mm) 1.590 1.407 EP12(mm) 0.934 0.925 EP23(mm) 0.951 1.035 L(mm) 4.385 4.129

[0132] In the third embodiment, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is convex. The object side surface S3 of the second lens is concave, and the image side surface S4 of the second lens is concave. The object side surface S5 of the third lens is concave, and the image side surface S6 of the third lens is concave. The object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is concave.

[0133] In the third embodiment, the effective focal length f1 of the first lens is 3.80 mm, the effective focal length f2 of the second lens is -4.06 mm, the effective focal length f3 of the third lens is -2.68 mm, and the effective focal length f4 of the fourth lens is 2.74 mm.

[0134] 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.

[0135] Table 9

[0136]

[0137] Table 10 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for the aspheric mirror surfaces S1-S8 in Example 3.

[0138] Table 10

[0139] Face number A4 A6 A8 A10 A12 A14 A16 S1 -3.73E-02 -1.86E-02 -4.94E-03 -8.61E-04 -1.51E-04 9.64E-05 3.93E-05 S2 2.31E-01 -2.85E-02 2.00E-03 2.35E-03 -8.77E-04 1.08E-03 -5.95E-04 S3 4.28E-01 -1.16E-02 -1.16E-03 6.12E-03 -2.99E-03 2.38E-03 -1.57E-03 S4 -7.11E-02 2.04E-02 -1.62E-02 7.73E-03 -3.34E-03 2.43E-03 -1.37E-03 S5 3.22E-01 9.44E-03 -1.57E-02 9.38E-03 -5.12E-03 3.14E-03 -1.30E-03 S6 -3.65E-01 9.85E-02 -3.22E-02 1.39E-02 -5.96E-03 2.37E-03 -7.66E-04 S7 -5.37E-01 8.40E-02 -2.38E-02 8.07E-03 -2.59E-03 8.91E-04 -2.08E-04 S8 2.13E-02 -7.33E-03 -8.23E-04 1.12E-04 1.45E-04 -7.12E-05 6.75E-05 Face number A18 A20 A22 A24 A26 A28 A30 S1 2.77E-05 4.63E-06 3.24E-06 4.13E-06 2.34E-06 3.07E-06 4.07E-06 S2 5.09E-04 -2.60E-04 1.94E-04 -9.91E-05 2.45E-05 -3.38E-06 -1.52E-05 S3 1.34E-03 -9.13E-04 6.67E-04 -4.56E-04 2.26E-04 -1.00E-04 1.97E-05 S4 1.20E-03 -8.87E-04 7.29E-04 -5.85E-04 1.01E-04 6.08E-05 -1.01E-05 S5 7.20E-04 -4.07E-04 3.59E-04 -3.17E-04 -1.63E-05 5.66E-05 1.81E-06 S6 2.31E-04 -8.34E-05 4.49E-05 -3.01E-05 9.55E-06 -1.13E-05 -2.31E-06 S7 4.98E-05 -1.01E-05 6.55E-06 -7.65E-06 3.38E-06 -7.14E-07 5.52E-08 S8 -2.34E-05 9.04E-06 -3.93E-08 -1.64E-06 1.17E-06 4.27E-07 -8.37E-07

[0140] 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.19The 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.

[0141] 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.

[0142] Embodiment 4

[0143] 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.

[0144] 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, and a fourth lens E4 arranged in the lens barrel P0 from the object side to the image side.

[0145] 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 in partial contact 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 image side surface of the second spacer P2 are in partial contact 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 image side surface of the third spacer P3 are in partial contact with the image side surface S6 of the third lens and the object side surface S7 of the fourth lens, respectively.

[0146] like Fig.21 FIG. 4 is a schematic diagram of the structure of the optical imaging lens of Example 4-2. In this example, the supporting and abutting manner of each spacer is the same as that of Example 4-1, and the relevant description in Example 4-1 may be referred to, and will not be repeated here.

[0147] 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.

[0148] Table 11

[0149] Parameters / Examples 4-1 4-2 d1m(mm) 4.215 4.274 D1m(mm) 6.588 5.870 d2m(mm) 3.996 3.916 D2s(mm) 6.688 5.770 D2m(mm) 6.688 5.770 d3s(mm) 3.580 3.672 d3m(mm) 3.580 3.672 D3m(mm) 6.788 5.670 d0s(mm) 5.517 6.580 D0s(mm) 7.867 7.122 CP1(mm) 0.026 0.028 EP01(mm) 1.607 1.507 EP12(mm) 0.847 0.851 EP23(mm) 1.020 1.099 L(mm) 4.471 4.343

[0150] In the fourth embodiment, the object side surface S1 of the first lens is a convex surface, and the image side surface S2 of the first lens is a convex 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 concave 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 concave surface. The object side surface S7 of the fourth lens is a convex surface, and the image side surface S8 of the fourth lens is a concave surface.

[0151] In the fourth embodiment, the effective focal length f1 of the first lens is 3.83 mm, the effective focal length f2 of the second lens is -4.20 mm, the effective focal length f3 of the third lens is -2.67 mm, and the effective focal length f4 of the fourth lens is 2.76 mm.

[0152] 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.

[0153] Table 12

[0154]

[0155]

[0156] Table 13 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for the aspheric mirror surfaces S1-S8 in Example 4.

[0157] Table 13

[0158] Face number A4 A6 A8 A10 A12 A14 A16 S1 -4.35E-02 -1.19E-02 -1.42E-03 3.49E-04 2.07E-04 1.37E-04 3.86E-05 S2 2.59E-01 -2.85E-02 6.07E-03 1.33E-03 1.14E-04 7.53E-04 -2.21E-04 S3 4.54E-01 -2.76E-02 4.79E-03 1.63E-03 -7.49E-04 1.36E-03 -9.56E-04 S4 -1.12E-01 4.57E-03 -1.22E-02 6.47E-03 -2.20E-03 2.39E-03 -1.61E-03 S5 3.75E-01 -1.12E-02 -1.11E-02 8.33E-03 -4.13E-03 3.13E-03 -1.26E-03 S6 -3.18E-01 8.57E-02 -2.98E-02 1.26E-02 -5.16E-03 2.09E-03 -6.53E-04 S7 -5.31E-01 8.27E-02 -2.34E-02 7.71E-03 -2.47E-03 8.85E-04 -2.42E-04 S8 1.57E-02 -6.79E-03 -9.07E-04 -1.59E-05 1.25E-04 -5.00E-05 4.40E-05 Face number A18 A20 A22 A24 A26 A28 A30 S1 1.29E-05 4.66E-06 5.89E-08 -2.62E-08 -2.51E-06 -3.71E-06 -2.84E-06 S2 2.70E-04 -1.24E-04 4.47E-05 -4.69E-05 -1.24E-05 -1.05E-05 -5.24E-06 S3 8.42E-04 -6.91E-04 3.97E-04 -2.71E-04 1.15E-04 -4.93E-05 2.06E-05 S4 7.59E-04 -1.31E-03 1.03E-03 -5.34E-04 1.08E-04 7.42E-05 -1.34E-05 S5 5.13E-04 -9.60E-04 5.96E-04 -2.48E-04 -1.87E-05 5.62E-05 5.76E-06 S6 2.67E-04 -1.56E-04 4.79E-05 -5.03E-05 9.16E-06 -1.19E-05 -2.28E-06 S7 1.07E-04 -3.40E-05 1.50E-05 -1.21E-05 1.50E-06 -7.21E-07 2.51E-07 S8 -5.76E-06 8.40E-06 -1.00E-06 -6.56E-07 -8.40E-07 8.98E-07 -8.97E-07

[0159] 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.

[0160] 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.

[0161] In summary, Embodiments 1 to 4 respectively satisfy the relationships shown in Table 14.

[0162] Table 14

[0163]

[0164]

[0165] Table 15 shows the effective focal lengths of the lenses of the optical imaging lenses of Examples 1 to 4.

[0166] Table 15.

[0167] Parameters / Examples one two three Four f1(mm) 3.99 3.84 3.80 3.83 f2(mm) -3.91 -4.12 -4.06 -4.20 f3(mm) -2.63 -2.66 -2.68 -2.67 f4(mm) 2.57 2.72 2.74 2.76

[0168] 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.

[0169] 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.

[0170] 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.

[0171] 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.

[0172] 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, 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; The central 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 the following relationship: 0.96≤CT1 / EP01≤1.26; the outer diameter D1m of the image side face of the first spacer, the inner diameter d1m of the image side face of the first spacer and the curvature radius R3 of the object side face of the second lens satisfy the following relationship: -1.69≤R3 / (D1m-d1m)≤-1.

11.

2. The optical imaging lens according to claim 1, wherein: A curvature radius R4 of the image-side surface of the second lens and an outer diameter D2s of the object-side surface of the second spacer satisfy the following: 2.68≤R4 / D2s≤14.

75.

3. The optical imaging lens according to claim 1, wherein: The outer diameter D2m of the image side surface of the second spacer, the inner diameter d2m of the image side surface of the second spacer, and the curvature radius R5 of the object side surface of the third lens satisfy: -3.51≤R5 / (D2m-d2m)≤-2.

32.

4. The optical imaging lens according to claim 1, wherein: A curvature radius R6 of the image-side surface of the third lens, an inner diameter d3s of the object-side surface of the third spacer, and a refractive index of the third lens satisfy: 2.30≤d3s / R6×N3≤2.

54.

5. The optical imaging lens according to claim 1, wherein: A center thickness CT1 of the first lens on the optical axis, a center thickness CT2 of the second lens on the optical axis, and a maximum thickness CP1 of the first spacer satisfy the following: 4.53≤(CT1+CP1) / CT2≤6.

35.

6. The optical imaging lens according to claim 1, wherein: An axial interval EP12 between the first spacer and the second spacer and a center thickness CT2 of the second lens on the optical axis satisfy the following: 2.71≤EP12 / CT2≤3.

68.

7. The optical imaging lens according to claim 1, wherein: An axial interval EP23 between the second spacer and the third spacer and a center thickness CT3 of the third lens on the optical axis satisfy the following: 2.67≤EP23 / CT3≤3.

27.

8. The optical imaging lens according to claim 1, wherein: The maximum axial height L of the lens barrel, the air interval T12 between the first lens and the second lens on the optical axis, the air interval T23 between the second lens and the third lens on the optical axis, and the air interval T34 between the third lens and the fourth lens on the optical axis satisfy: 6.57≤L / (T12+T23+T34)≤7.

21.

9. The optical imaging lens according to claim 1, wherein: The effective focal length f1 of the first lens and the axial distance EP01 between the object-side end surface of the lens barrel and the first spacer satisfy the following ratio: 2.38≤f1 / EP01≤3.

00.

10. The optical imaging lens according to claim 1, wherein: The outer diameter D0s of the object side end surface of the lens barrel, the inner diameter d0s of the object side end surface of the lens barrel, and the center thickness CT1 of the first lens on the optical axis satisfy the following relationship: 0.27≤(D0s-d0s) / CT1≤1.

52.

11. The optical imaging lens according to claim 1, wherein: The inner diameter d0s of the object-side end surface of the lens barrel and the curvature radius R1 of the object-side surface of the first lens satisfy the following relationship: 1.37≤d0s / R1≤1.

77.

12. The optical imaging lens according to claim 1, wherein: A curvature radius R7 of the object side surface of the fourth lens, an outer diameter D3m of the image side surface of the third spacer, and an inner diameter d3m of the image side surface of the third spacer satisfy the following: 1.14≤(D3m-d3m) / R7≤1.

83.

13. The optical imaging lens according to claim 1, wherein: The axial interval EP12 between the first spacer and the second spacer, the axial interval EP23 between the second spacer and the third spacer, and the effective focal length f2 of the second lens satisfy: -2.25≤f2 / (EP12+EP23)≤-2.

01.

14. The optical imaging lens according to any one of claims 1 to 13, characterized in that: The first lens has positive optical power, the second lens has negative optical power, the third lens has negative optical power, and the fourth lens has positive optical power.

15. The optical imaging lens according to any one of claims 1 to 13, characterized in that: The object side surface of the first lens is convex, and the image side surface is convex; the object side surface of the second lens is concave, and the image side surface is concave; the object side surface of the third lens is concave, and the image side surface is concave; the object side surface of the fourth lens is convex, and the image side surface is concave.

Images