Optical imaging lens

Abstract

The invention provides an optical imaging lens, the optical imaging lens has four lenses with focal power, the optical imaging lens comprises a lens group, a spacing element group and a lens barrel, and the lens group comprises a first lens, a second lens, a third lens, a fourth lens and a fourth lens which are sequentially arranged at intervals from the object side to the image side of the optical imaging lens; the lens group and the spacing element group are accommodated in the lens barrel; wherein the effective focal length f4 of the fourth lens and the axial distance T34 between the image side surface of the third lens and the object side surface of the fourth lens meet the condition that f4 / T34 is more than or equal to-231.04 and less than or equal to-105.74; and the effective focal length f4 of the fourth lens, the central thickness CT4 of the fourth lens and the maximum thickness CP3 of the third spacing element meet the condition that f4 / (CP3 + CT4) is more than or equal to-6.58 and less than or equal to-4.35. According to the optical imaging lens, the problem of how to consider forming and assembling stability of two lenses at the rear end in the prior art 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] Environmental perception modules play a vital role in autonomous driving technology. Among them, laser radar, as the main environmental perception solution, has shown great advantages and broad application prospects in the field of autonomous driving with its full-time working ability, low sensitivity to ambient light and high ranging accuracy. In the environment of autonomous driving, the optical imaging lens needs to maintain stable working performance under various harsh conditions, so the assembly stability of the optical imaging lens must be considered during design. Laser radar usually uses light in the near-infrared band for detection, so the optical imaging lens at the receiving end must be able to work in the near-infrared band to ensure that the received signal has sufficient strength and clarity. In the traditional four-piece optical imaging lens design, the rear lens has a greater impact on the final imaging effect, and it is easy to have an extreme design of the lens shape. The thickness difference between the center and edge of the lens is large, which affects the assembly stability. However, due to the mutual constraints of the structural design between multiple lenses, when the shape of the third lens is reasonable, the structure of the fourth lens is difficult to meet the requirements of compression molding, and the assembly stability is also poor. In other words, how to control the shape of the fourth lens while ensuring the molding and assembly of the third lens, and taking into account the molding and assembly stability of the two rear lenses is a very important issue. Summary of the invention

[0003] The main purpose of the present invention is to provide an optical imaging lens to solve the problem of how to balance the molding and assembly stability of two rear lenses in the optical imaging lens in the prior art.

[0004] In order to achieve the above object, according to one aspect of the present invention, an optical imaging lens is provided, wherein the number of lenses having optical power in the optical imaging lens is four, and the optical imaging lens comprises: a lens group, wherein the lens group comprises a first lens to a fourth lens arranged in sequence from the object side to the image side of the optical imaging lens; a spacer element group, wherein the spacer element group comprises at least a first spacer element located between the first lens and the second lens and at least partially in contact with the image side surface of the first lens, a second spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens, and a spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens. A third spacing element is between the third lens and the fourth lens and at least partially contacts the image side surface of the third lens; a lens barrel, a lens group and a spacing element group are accommodated in the lens barrel; wherein the effective focal length f4 of the fourth lens and the axial distance T34 between the image side surface of the third lens and the object side surface of the fourth lens satisfy: -231.04≤f4 / T34≤-105.74; the effective focal length f4 of the fourth lens, the center thickness CT4 of the fourth lens, and the maximum thickness CP3 of the third spacing element satisfy: -6.58≤f4 / (CP3+CT4)≤-4.35.

[0005] According to another aspect of the present invention, an optical imaging lens is provided, wherein the number of lenses having optical power of the optical imaging lens is four, and the optical imaging lens comprises: a lens group, wherein the lens group comprises a first lens to a fourth lens arranged in sequence from the object side to the image side of the optical imaging lens; a spacer element group, wherein the spacer element group comprises at least a first spacer element located between the first lens and the second lens and at least partially in contact with the image side surface of the first lens, a second spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens, and a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens; a lens barrel, wherein the lens group and the spacer element group are accommodated in the lens barrel; wherein the maximum thickness CP1 of the first spacer element, the center thickness CT1 of the first lens, and the center thickness CT2 of the second lens satisfy the following: 0.89≤CP1 / (CT1+CT2)≤1.34; and the curvature radius R4 of the image side surface of the second lens and the outer diameter D1m of the image side surface of the first spacer element satisfy the following: 3.89≤D1m / R4≤4.29.

[0006] According to another aspect of the present invention, there is provided an optical imaging lens, wherein the number of lenses having optical power is four, and the optical imaging lens comprises: a lens group, wherein the lens group comprises a first lens to a fourth lens arranged in sequence from the object side to the image side of the optical imaging lens; a spacer element group, wherein the spacer element group comprises at least a first spacer element located between the first lens and the second lens and at least partially in contact with the image side surface of the first lens, a second spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens, and a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens; a lens barrel, wherein the lens group and the spacer element group are accommodated in the lens barrel; wherein an effective focal length f4 of the fourth lens and an axial distance T34 between the image side surface of the third lens and the object side surface of the fourth lens satisfy: -231.04≤f4 / T34≤-105.74; and a curvature radius R7 of the object side surface of the fourth lens and an inner diameter d3m of the image side surface of the third spacer element satisfy: 0.41≤R7 / d3m≤0.46.

[0007] Furthermore, the maximum thickness CP1 of the first spacer element, the center thickness CT1 of the first lens, and the center thickness CT2 of the second lens satisfy: 0.89≤CP1 / (CT1+CT2)≤1.34.

[0008] Furthermore, an axial distance EP01 between the object-side end surface of the lens barrel and the object-side surface of the first spacing element and a sag height SAG11 of the object-side surface of the first lens satisfy: 3.20≤EP01 / |SAG11|≤3.78.

[0009] Furthermore, the first lens is a glass aspheric surface, and the outer diameter D1s of the object side surface of the first spacer element, the curvature radius R1 of the object side surface of the first lens, and the refractive index N1 of the first lens satisfy: -1.81≤D1s / (R1*N1)≤-1.49.

[0010] Furthermore, a curvature radius R4 of the image side surface of the second lens and an outer diameter D1m of the image side surface of the first spacing element satisfy: 3.89≤D1m / R4≤4.29.

[0011] Furthermore, an outer diameter D2m of the image-side surface of the second spacing element and a curvature radius R5 of the object-side surface of the third lens satisfy the following relationship: 1.14≤D2m / R5≤1.53.

[0012] Furthermore, the third lens is a glass aspheric surface, and the curvature radius R5 of the object side surface of the third lens, the refractive index N3 of the third lens, and the inner diameter d3s of the object side surface of the third spacer element satisfy: 1.19≤R5*N3 / d3s≤1.48.

[0013] Furthermore, an outer diameter D3m of the image side surface of the third spacer element, an outer diameter D3s of the object side surface of the third spacer element, a curvature radius R6 of the image side surface of the third lens, and a curvature radius R7 of the object side surface of the fourth lens satisfy: -1.22≤D3m / R7 / (D3s / R6)≤-0.98.

[0014] Furthermore, the maximum height L of the lens barrel and the center thickness CT3 of the third lens satisfy: 2.72≤L / CT3≤3.37.

[0015] Furthermore, an outer diameter D0m of the image side surface of the image side end surface of the lens barrel, an outer diameter D0s of the object side surface of the object side end surface of the lens barrel, and half the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens ImgH satisfy the following: 0.32≤(D0m-D0s) / ImgH≤1.17.

[0016] Furthermore, the inner diameter d0s of the object side end surface of the lens barrel, the inner diameter d0m of the image side end surface of the lens barrel, and half the diagonal length of the effective pixel area on the imaging plane of the optical imaging lens ImgH satisfy the following: 1.01≤(d0m-d0s) / ImgH≤1.30.

[0017] Further, the third lens has positive refractive power, and the fourth lens has negative refractive power.

[0018] Further, the object side surface of the first lens is concave, the image side surface of the first lens is convex, the object side surface of the second lens is convex, the image side surface of the second lens is concave, the object side surface of the third lens is convex, the image side surface of the third lens is convex, the object side surface of the fourth lens is convex, and the image side surface of the fourth lens is concave.

[0019] According to the technical solution of the present invention, the optical imaging lens has four lenses with optical power, and the optical imaging lens includes a lens group, a spacer element group and a lens barrel. The lens group includes a first lens to a fourth lens arranged in sequence from the object side to the image side of the optical imaging lens; the spacer element group includes at least a first spacer element located between the first lens and the second lens and at least partially in contact with the image side surface of the first lens, a second spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens, and a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens; the lens group and the spacer element group are accommodated in the lens barrel; wherein the effective focal length f4 of the fourth lens and the axial distance T34 between the image side surface of the third lens and the object side surface of the fourth lens satisfy: -231.04≤f4 / T34≤-105.74; the effective focal length f4 of the fourth lens, the center thickness CT4 of the fourth lens, and the maximum thickness CP3 of the third spacer element satisfy: -6.58≤f4 / (CP3+CT4)≤-4.35.

[0020] The optical imaging lens of the present application uses four lenses with optical power, and the first lens to the fourth lens are arranged in sequence and spaced apart. In order to meet the assembly stability of the optical imaging lens, by controlling f4 / T34 within a reasonable range, the radius of curvature of the image side of the third lens is maintained at a large degree, and then the edge thickness of the third lens is maintained within a suitable range, thereby improving the stability and reliability of the third lens molding, and finally improving the assembly stability of the third lens. However, in this case, the radius of curvature of the object side of the fourth lens will become larger, resulting in a phenomenon of thick middle and thin edges within the effective diameter of the fourth lens, causing the problem of unstable assembly of the fourth lens. Therefore, by controlling f4 / (CP3+CT4) within a reasonable range, the focal length of the fourth lens and its center thickness are further limited, avoiding the situation where the stability of the fourth lens assembly is reduced due to the improvement of the stability of the third lens assembly. The present application ensures that the optical imaging lens maintains the stability and good optical performance of the fourth lens while improving the reliability of the third lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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:

[0022] Figure 1 A schematic diagram showing some parameters of an optical imaging lens of any optional embodiment of the present invention;

[0023] Figure 2 A schematic structural diagram of an optical imaging lens according to a first embodiment of the present invention is shown;

[0024] Figures 3 to 6 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;

[0025] Figure 7 A schematic structural diagram of an optical imaging lens according to a second embodiment of the present invention is shown;

[0026] Figure 8 A schematic structural diagram of an optical imaging lens according to a third embodiment of the present invention is shown;

[0027] Figures 9 to 12 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;

[0028] Fig.13 A schematic structural diagram of an optical imaging lens according to a fourth embodiment of the present invention is shown;

[0029] Fig.14A schematic structural diagram of an optical imaging lens according to a fifth embodiment of the present invention is shown;

[0030] Figures 15 to 18 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging lens of the fifth embodiment of the present invention are respectively shown;

[0031] Fig.19 A schematic structural diagram of an optical imaging lens according to a sixth embodiment of the present invention is shown;

[0032] Fig. 20 A schematic structural diagram of an optical imaging lens according to a seventh embodiment of the present invention is shown;

[0033] Figure 21 to Figure 24 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging lens of the seventh embodiment of the present invention are respectively shown;

[0034] Fig.25 A schematic structural diagram of an optical imaging lens according to an eighth embodiment of the present invention is shown;

[0035] Fig.26 The tolerance analysis result of an optical imaging lens of the present invention under the conditions of f4 / T34=-105.74, f4 / (CP3+CT4)=-4.35 is shown;

[0036] Fig. 27 The tolerance analysis result of an optical imaging lens in the prior art under the conditions of f4 / T34=-105.74, f4 / (CP3+CT4)=-1.25 is shown;

[0037] Fig.28 The tolerance analysis result of an optical imaging lens in the prior art under the conditions of f4 / T34=-105.74, f4 / (CP3+CT4)=-10.37 is shown.

[0038] The above drawings include the following reference numerals:

[0039] P0, lens barrel; E1, first lens; P1, first spacing element; E2, second lens; P2, second spacing element; E3, third lens; P3, third spacing element; E4, fourth lens; P4, fourth spacing element; S1, object-side surface of the first lens; S2, image-side surface of the first lens; S3, object-side surface of the second lens; S4, image-side surface of the second lens; S5, object-side surface of the third lens; S6, image-side surface of the third lens; S7, object-side surface of the fourth lens; S8, image-side surface of the fourth lens. DETAILED DESCRIPTION

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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 ordinary knowledgeable people 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 eye-side surface, 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 display-side surface, 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.

[0046] like Figures 1 to 26As shown, the optical imaging lens has four lenses with optical power, and the optical imaging lens includes a lens group, a spacer element group and a lens barrel. The lens group includes a first lens to a fourth lens arranged in sequence from the object side to the image side of the optical imaging lens; the spacer element group includes at least a first spacer element located between the first lens and the second lens and at least partially in contact with the image side surface of the first lens, a second spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens, and a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens; the lens group and the spacer element group are accommodated in the lens barrel; wherein, the effective focal length f4 of the fourth lens and the axial distance T34 between the image side surface of the third lens and the object side surface of the fourth lens satisfy: -231.04≤f4 / T34≤-105.74; the effective focal length f4 of the fourth lens, the center thickness CT4 of the fourth lens, and the maximum thickness CP3 of the third spacer element satisfy: -6.58≤f4 / (CP3+CT4)≤-4.35.

[0047] The optical imaging lens of the present application uses four lenses with optical power, and the first lens to the fourth lens are arranged in sequence and spaced apart. In order to meet the assembly stability of the optical imaging lens, by controlling f4 / T34 within a reasonable range, the radius of curvature of the image side of the third lens is maintained at a large degree, and then the edge thickness of the third lens is maintained within a suitable range, thereby improving the stability and reliability of the third lens molding, and finally improving the assembly stability of the third lens. However, in this case, the radius of curvature of the object side of the fourth lens will become larger, resulting in a phenomenon of thick middle and thin edges within the effective diameter of the fourth lens, causing the problem of unstable assembly of the fourth lens. Therefore, by controlling f4 / (CP3+CT4) within a reasonable range, the focal length of the fourth lens and its center thickness are further limited, avoiding the situation where the stability of the fourth lens assembly is reduced due to the improvement of the stability of the third lens assembly. The present application ensures that the optical imaging lens maintains the stability and good optical performance of the fourth lens while improving the reliability of the third lens.

[0048] Table 1 below shows a comparison of tolerance analysis results of an optional embodiment of the present application and an optical imaging lens in the prior art.

[0049]

[0050]

[0051] Table 1

[0052] Lens 2 and Lens 3 in Table 1 are optical imaging lenses in the prior art. The horizontal axis MTF of the tolerance analysis result represents the modulation transfer function value, and the vertical axis simulates the cumulative ratio. The higher the cumulative ratio at the same MTF value, the higher the performance yield of the optical imaging lens under the MTF value. Fig. 27 As shown in FIG. 1 , under the condition of f4 / (CP3+CT4)=-1.25, the radius of curvature of the object side of the fourth lens increases abnormally, making the fourth lens thick in the middle and thin at the edge, which not only affects the structural stability of the fourth lens, but also increases the difficulty of molding, resulting in large assembly tolerance and low yield of the optical imaging lens. Fig.28 As shown, under the condition of f4 / (CP3+CT4)=-10.37, the object side surface of the fourth lens requires a larger curvature radius or a thicker shape, resulting in a relatively thinner thickness in the edge area of ​​the object side surface of the fourth lens, thereby increasing the difficulty and instability risk of molding, resulting in a large assembly tolerance and low yield of the optical imaging lens.

[0053] The optical imaging lens of the present application controls the f4 / T34 ratio within a reasonable range, such as Fig.26 As shown, the curvature radius of the image side of the third lens is relatively large, the edge thickness of the third lens meets the stability and reliability requirements of the molding, the assembly of the third lens is stable, and the final optical imaging lens has a small assembly tolerance and a high yield.

[0054] In this embodiment, the maximum thickness CP1 of the first spacer element, the center thickness CT1 of the first lens, and the center thickness CT2 of the second lens satisfy the following relationship: 0.89≤CP1 / (CT1+CT2)≤1.34. Since CP1 can be regarded as the sum of the sagitta of the image side surface of the first lens, the air gap between the first lens and the second lens, and the sagitta of the object side surface of the second lens, the control of the size of CP1 also reflects the sagitta of the first lens and the second lens. The sagitta describes the degree of deviation of the lens surface relative to its central axis, which is crucial to the optical performance of the lens. When the ratio of CP1 / (CT1+CT2) is less than 0.89, the sagitta of the image side surface of the first lens and the sagitta of the object side surface of the second lens become smaller, and the light refraction ability becomes weaker, and the third lens needs to be thickened to compensate, which in turn causes the thickness of the third lens to increase, affecting the molding of the third lens. When the ratio of CP1 / (CT1+CT2) is greater than 1.34, the sagitta of the image side surface of the first lens and the sagitta of the object side surface of the second lens are too large, resulting in a poor surface shape and excessive wavefront aberration in the molding of the second lens, affecting the final imaging effect of the optical imaging lens. By controlling CP1 / (CT1+CT2) within a reasonable range, the sagitta of the image side surface of the first lens, the sagitta of the object side surface of the second lens, and the air gap between the first lens and the second lens can be kept within a reasonable range, and each lens has a good molding effect, which helps to improve the stability of the optical imaging lens during assembly and reduce the assembly tolerance caused by lens shape mismatch.

[0055] It should be noted that the sagittal height of the lens surface represents the on-axis distance from the intersection of the lens surface and the optical axis to the vertex of the effective radius of the lens surface.

[0056] In this embodiment, the on-axis distance EP01 between the object side end face of the lens barrel and the object side face of the first spacing element, and the sagitta SAG11 of the object side face of the first lens satisfy the following conditions: 3.20≤EP01 / |SAG11|≤3.78. EP01 can be regarded as the sum of the edge thickness of the object side end face of the lens barrel and the first lens, and |SAG11| is the sagitta length of the object side face of the first lens. When the ratio of EP01 / |SAG11| is less than 3.20, the edge thickness of the first lens is small and the sagitta of the object side face of the first lens is large, resulting in the risk of poor compression molding of the first lens. When the ratio of EP01 / |SAG11| is greater than 3.78, the sagitta of the object side face of the first lens is small and the edge thickness is large, and there is a phenomenon of reverse curvature of the effective diameter edge of the first lens, and compression molding of the first lens is difficult to ensure. By controlling EP01 / |SAG11| within a reasonable range, it is helpful to control the sagitta of the object side of the first lens, so that it is not easy to have edge recurvature and other phenomena during the molding process, thereby ensuring the stability and quality of the molding of the first lens. At the same time, the reasonable control of EP01 / |SAG11| helps to reduce the tolerance when assembling the optical imaging lens, making the first lens more stable during the assembly process and reducing the degradation of optical performance caused by assembly errors. In addition, the relative position of the sagitta of the object side of the first lens and the object side end face of the lens barrel is properly controlled, which can ensure that the first lens is fixed in the correct position and reduce unnecessary stress and deformation.

[0057] In this embodiment, the first lens adopts a glass aspheric surface, and the outer diameter D1s of the object side surface of the first spacer element, the radius of curvature R1 of the object side surface of the first lens, and the refractive index N1 of the first lens satisfy: -1.81≤D1s / (R1*N1)≤-1.49. Since the first lens of the optical imaging lens adopts an aspheric glass material, and the aspheric curve of the image side surface of the first lens is prone to recurvature, when the recurvature is too large, it affects the molding of the first lens. When the ratio of D1s / (R1*N1) is too small or too large, the effective diameter edge of the image side surface of the first lens is severely recurved, and the molding difficulty becomes greater. By controlling D1s / (R1*N1) within a reasonable range, the shape of the first lens can be controlled to meet the requirements of molding, and the recurvature phenomenon at the edge can be reduced, thereby reducing the failure rate of the first lens in the manufacturing process and improving the production yield of the optical imaging lens. In addition, by controlling the ratio of D1s / (R1*N1) within a reasonable range, the structural strength and optical performance of the first lens are balanced, ensuring that the optical performance of the first lens is not affected while satisfying the structural design conditions.

[0058] In this embodiment, the curvature radius R4 of the image side surface of the second lens and the outer diameter D1m of the image side surface of the first spacer element satisfy: 3.89≤D1m / R4≤4.29. When D1m / R4 is too small, the sagittal height of the image side surface of the second lens is too large, which affects the molding of the second lens. When D1m / R4 is too large, the refractive power of the second lens decreases. As compensation, the thickness of the third lens increases and its aspheric curve becomes flat, resulting in poor molding of the third lens. By controlling D1m / R4 within a reasonable range, it can be ensured that the image side surface of the second lens has an appropriate radius of curvature to maintain good refractive power, while avoiding excessive refraction angles of light caused by too small radius of curvature of the image side surface of the second lens, thereby reducing aberrations and optimizing the imaging performance of the optical imaging lens. In addition, D1m / R4 within a reasonable range can ensure a smooth transition of light when it is transmitted from the first lens to the second lens, reduce step differences and assembly tolerances, and improve the stability and reliability of the optical imaging lens.

[0059] In this embodiment, the outer diameter D2m of the image side surface of the second spacer element and the curvature radius R5 of the object side surface of the third lens satisfy: 1.14≤D2m / R5≤1.53. When the ratio of D2m / R5 is too small, the contact area between the third lens and the second spacer element is insufficient, which poses a risk when assembling the optical imaging lens. When the ratio of D2m / R5 is too large, the step difference between the second spacer element and the third lens will be enlarged, causing the outer diameter of the third lens to further expand, and the volume of the optical imaging lens will increase. At the same time, due to the increase in the step difference between the second spacer element and the third spacer element, the material of the second spacer element will change from plastic to metal, increasing the cost of the optical imaging lens. By controlling D2m / R5 within a reasonable range, it is possible to ensure that there is sufficient contact area between the second spacer element and the third lens, thereby providing sufficient support and positioning during the assembly process, preventing the third lens from being displaced or unstable due to insufficient contact, ensuring the assembly accuracy and stability of the optical imaging lens, and balancing the cost and imaging quality of the optical imaging lens.

[0060] In this embodiment, the third lens adopts a glass aspheric surface, and the radius of curvature R5 of the object side of the third lens, the refractive index N3 of the third lens, and the inner diameter d3s of the object side of the third spacer element satisfy: 1.19≤R5*N3 / d3s≤1.48. When the third lens is made of glass, light is easily reflected on the third spacer element to form stray light. When the ratio of R5*N3 / d3s is too small, the contact area between the third spacer element and the third lens is insufficient, and there is a risk of unstable assembly. When the ratio of R5*N3 / d3s is too large, the inner diameter of the object side of the third spacer element is too small, and the light is reflected on the inner diameter surface of the third spacer element, resulting in a decrease in the imaging quality of the optical imaging lens. By controlling R5*N3 / d3s within a reasonable range, the sharp corners of the inner diameter of the third spacer element can effectively avoid the generation of stray light, reduce unexpected light spots and interference, and thus improve the imaging quality of the optical imaging lens.

[0061] In this embodiment, the outer diameter D3m of the image side surface of the third spacer element, the outer diameter D3s of the object side surface of the third spacer element, the curvature radius R6 of the image side surface of the third lens, and the curvature radius R7 of the object side surface of the fourth lens satisfy: -1.22≤D3m / R7 / (D3s / R6)≤-0.98. When D3m / R7 / (D3s / R6) is not within this range, there is a risk that the curvature radius of the object side surface of the fourth lens is too large or too small, and the excessively thin edge thickness may cause the fourth lens to break or deform during the molding process, while the excessively thick edge may cause light to scatter at the edge of the fourth lens, affecting the imaging quality of the optical imaging lens. By controlling D3m / R7 / D3s / R6 within a reasonable range, the curvature radius of the image side surface of the third lens and the curvature radius of the object side surface of the fourth lens can be kept within a reasonable range, which can ensure that the transition design between the third lens and the fourth lens is more reasonable, avoid the edge thickness problem caused by the curvature radius of the object side surface of the fourth lens being too large or too small, and reduce the lens displacement and uneven stress distribution caused by excessive step difference during the assembly process, thereby improving the assembly yield and stability of the optical imaging lens.

[0062] In this embodiment, the maximum height L of the lens barrel and the center thickness CT3 of the third lens satisfy: 2.72≤L / CT3≤3.37. L refers to the maximum height of the entire lens barrel, that is, the distance from the object side end face of the optical imaging lens to the image side end face along the optical axis. By controlling L / CT3 within a reasonable range, it is helpful to control the ratio of the thickness of the third lens to the maximum height of the lens barrel. The larger the air gap between the third lens and the fourth lens, the easier it is to select and match the third spacing element, and the larger the space for improving stray light, so that the matching mode of the third lens and the fourth lens can be better controlled, which is more conducive to the improvement of the overall stray light quality of the optical imaging lens. In addition, the maximum height of the lens barrel not only affects the appearance and volume of the optical imaging lens, but also is related to the strength and heat dissipation performance of the lens barrel. A higher L value helps to enhance the structural stability of the lens barrel and reduce the impact of external impact on the lens. At the same time, by controlling the ratio of L / CT3, a lens barrel with compact structure, sufficient strength and good heat dissipation can be designed without sacrificing the optical performance of the third lens.

[0063] In this embodiment, the outer diameter D0m of the image side surface of the image side end surface of the lens barrel, the outer diameter D0s of the object side surface of the object side end surface of the lens barrel, and the half of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens ImgH satisfy: 0.32≤(D0m-D0s) / ImgH≤1.17. When the wall thickness of the lens barrel is uneven, the optical imaging lens is prone to stress concentration, and the structural strength and impact resistance are poor. By controlling (D0m-D0s) / ImgH within a reasonable range, it is conducive to meeting the needs of the appearance control of the optical imaging lens. The outer diameter D0m of the image side end surface of the lens barrel is controlled by the size of the imaging surface of the lens and the module motor, and the outer diameter D0s of the object side surface of the lens barrel is mainly controlled by the module window opening and the size of the assembly bearing area. These dimensions jointly affect the appearance style of the optical imaging lens. Under the condition of fixed optical effective aperture, the better the wall thickness uniformity of the lens barrel, the more stable the reliability of the optical imaging lens.

[0064] In this embodiment, the inner diameter d0s of the object side end surface of the lens barrel, the inner diameter d0m of the image side end surface of the lens barrel, and half of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens ImgH satisfy the following: 1.01≤(d0m-d0s) / ImgH≤1.30. When the ratio of (d0m-d0s) / ImgH is too small, the step difference between the lenses is too small, resulting in difficulty in molding the first lens due to the excessive length of the structural parts of the first lens and the second lens, or instability during the assembly of the optical imaging lens due to the excessive shortness of the structural parts of the third lens and the fourth lens. When the ratio of (d0m-d0s) / ImgH is too large, the step difference between the lenses is too large, resulting in insufficient strength of the spacing element, requiring replacement of a stronger material, and increasing the cost of the optical imaging lens. By controlling (d0m-d0s) / ImgH within a reasonable range, the lens structure length of the optical imaging lens can be controlled, which helps to optimize the internal structural layout of the optical imaging lens, reduce aberrations, and improve the reliability and cost-effectiveness of the optical imaging lens.

[0065] In this embodiment, the third lens has positive focal length and the fourth lens has negative focal length. By setting the combination design of positive and negative focal lengths of the third lens and the fourth lens, the optical imaging lens can maintain good imaging performance in a wider wavelength range, reduce aberrations, and improve image sharpness and color reproduction. In addition, the combination of positive and negative lenses can reduce the total length and volume of the optical imaging lens by optimizing the internal optical path, thereby achieving a compact structure.

[0066] In this embodiment, the object side of the first lens is concave, the image side of the first lens is convex, the object side of the second lens is convex, the image side of the second lens is concave, the object side of the third lens is convex, the image side of the third lens is convex, the object side of the fourth lens is convex, and the image side of the fourth lens is concave. Through the configuration of the lens surface shape, chromatic aberration, especially magnification chromatic aberration, can be effectively corrected. The combined use of concave and convex surfaces can control the refraction angle of light of different wavelengths, so that the light can be more accurately converged, reducing the color edge or blur caused by dispersion. In addition, the object side of the first lens is concave, which can effectively expand the angle of the incident light, and the image side of the first lens is convex, which helps to converge the light, the second lens further controls the light trend, the third lens converges the light again, and the fourth lens finally diverges the light to the imaging surface. This configuration helps to accurately control the direction of the light and ensure that the light can reach the imaging surface in the best state.

[0067] 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. Optionally, the optical imaging lens can be simulated by ZEMAX software. In the process of simulation using the above software and / or tools, the surface shape of each lens can be appropriately adjusted according to the surface shape of the surface provided by the software and / or tool used.

[0068] 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.

[0069] In this embodiment, each spacer element can be selected as a trimming spacer element. The outer annular surface of the trimming spacer element 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 element usually refers to the maximum outer diameter of the non-trimming portion.

[0070] In another optional embodiment of the present application, an optical imaging lens is further provided, wherein the number of lenses with optical power of the optical imaging lens is four, the optical imaging lens comprises a lens group, a spacer element group and a lens barrel, wherein the lens group comprises a first lens to a fourth lens arranged in sequence from the object side to the image side of the optical imaging lens; the spacer element group comprises at least a first spacer element located between the first lens and the second lens and at least partially in contact with the image side surface of the first lens, a second spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens, and a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens; the lens group and the spacer element group are accommodated in the lens barrel; wherein the maximum thickness CP1 of the first spacer element, the center thickness CT1 of the first lens, and the center thickness CT2 of the second lens satisfy the following: 0.89≤CP1 / (CT1+CT2)≤1.34; the curvature radius R4 of the image side surface of the second lens and the outer diameter D1m of the image side surface of the first spacer element satisfy the following: 3.89≤D1m / R4≤4.29.

[0071] The optical imaging lens of the present application uses four lenses with optical focal length, and the first lens to the fourth lens are arranged in sequence and spaced apart. In order to meet the requirements of optimizing the surface shape of the optical imaging lens, by controlling CP1 / (CT1+CT2) within a reasonable range, the sagittal height of the image side of the first lens, the sagittal height of the object side of the second lens, and the air gap between the first lens and the second lens can be kept within a reasonable range, and each lens has a good molding effect, which helps to improve the stability of the optical imaging lens during assembly and reduce the assembly tolerance caused by lens shape mismatch. However, in this case, the refractive power of the first lens and the second lens to light becomes weaker. By controlling D1m / R4 to be within a reasonable range, it is ensured that the image side of the second lens has an appropriate radius of curvature to maintain good refractive power, while avoiding excessive light refraction angles caused by too small radius of curvature of the image side of the second lens, thereby reducing aberrations and optimizing the imaging performance of the optical imaging lens.

[0072] It should be noted that this embodiment also includes other conditional expressions in the above embodiment, which will not be described one by one here.

[0073] In another optional embodiment of the present application, an optical imaging lens is further provided. The optical imaging lens has four lenses with optical power. The optical imaging lens includes a lens group, a spacer element group and a lens barrel. The lens group includes a first lens to a fourth lens arranged in sequence from the object side to the image side of the optical imaging lens; the spacer element group includes at least a first spacer element located between the first lens and the second lens and at least partially in contact with the image side surface of the first lens, a spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens. A second spacing element, a third spacing element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens; the lens group and the spacing element group are accommodated in the lens barrel; wherein, the effective focal length f4 of the fourth lens and the axial distance T34 between the image side surface of the third lens and the object side surface of the fourth lens satisfy: -231.04≤f4 / T34≤-105.74; the curvature radius R7 of the object side surface of the fourth lens and the inner diameter d3m of the image side surface of the third spacing element satisfy: 0.41≤R7 / d3m≤0.46.

[0074] The optical imaging lens of the present application uses four lenses with optical power, and the first lens to the fourth lens are arranged in sequence and spaced apart. In order to meet the assembly stability of the optical imaging lens, by controlling f4 / T34 within a reasonable range, the appropriate ratio between the focal length of the fourth lens and the air gap between the third lens and the fourth lens is ensured, which can reduce the fluctuation of optical parameters caused by temperature changes or stress, thereby improving the stability of the lens in different environments. In addition, reasonable control of f4 / T34 can accurately control the correction of axial chromatic aberration and spherical aberration. The negative focal length characteristics of the fourth lens combined with a specific air gap help different wavelengths of light to focus consistently on the imaging surface and improve image quality. By controlling R7 / d3m within a reasonable range, the transition position of the effective diameter part and the structural part of the object side of the fourth lens is controlled more reasonably, avoiding large differences in the center thickness and edge thickness of the fourth lens, optimizing the molding and assembly stability of the fourth lens, and controlling d3m at the same time helps intercept stray light between lenses, ensuring that light can be effectively controlled when entering the fourth lens, reducing scattered light, and improving the contrast of the image, thereby improving the efficiency and imaging quality of the optical imaging lens.

[0075] It should be noted that this embodiment also includes other conditional expressions in the above embodiment, which will not be described one by one here.

[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, d3s, and EP01 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 any one of the following embodiments 1 to 8 is applicable to all implementation methods of the present application.

[0081] Embodiment 1

[0082] like Figures 2 to 6 As shown, the optical imaging lens of the first embodiment of the present application is described. Figure 2 A schematic structural diagram of an optical imaging lens according to Embodiment 1 is shown.

[0083] like Figure 2 As shown, the optical imaging lens includes, from the object side to the image side, a lens barrel P0, a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a third lens E3, a third spacing element P3, a fourth lens E4, and a fourth spacing element P4.

[0084] The first lens E1 has negative power, the object side surface S1 of the first lens is concave, and the image side surface S2 of the first lens is convex. The second lens E2 has positive power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens E3 has positive power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is convex. The fourth lens E4 has negative power, the object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is concave. The filter has an object side surface S9 of the filter and an image side surface S10 of the filter, and the protective glass has an object side surface S11 of the protective glass and an image side surface S12 of the protective glass. The light from the object passes through each surface S1 to S12 in sequence and is finally imaged on the imaging surface S13.

[0085] Table 2 shows the basic structural parameters of the optical imaging lens of Example 1, wherein the units of the curvature radius, thickness / distance, effective radius and focal length are all millimeters (mm).

[0086]

[0087]

[0088] Table 2

[0089] In the first embodiment, the object side surface and the image side surface of any lens among the first lens E1 to the fourth lens E4 are both aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0090]

[0091] 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 (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 2 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 3 below 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.

[0092]

[0093] Table 3

[0094] Figure 3 The axial chromatic aberration curve of the optical imaging lens of the first embodiment is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 4 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 5 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 6 The chromatic aberration curve of the optical imaging lens of the first embodiment is shown, which indicates the degree to which the focusing points of light rays of different wavelengths do not completely overlap.

[0095] according to Figures 3 to 6 It can be seen that the optical imaging lens provided in the first embodiment can achieve good imaging quality.

[0096] Embodiment 2

[0097] like Figure 7 As shown, the optical imaging lens of the second embodiment of the present application is described, which is different from the first embodiment in that the distances and thicknesses between the spacer elements, lenses, lens barrel P0, etc. are different.

[0098] Figure 7 The schematic diagram of the structure of the optical imaging lens of the second embodiment is shown. For the sake of brevity, some descriptions similar to those of the first embodiment are omitted. In this embodiment, the outer diameters of each lens and the spacer element are small, which is conducive to the miniaturization design of the optical imaging lens.

[0099] Embodiment 3

[0100] like Figures 8 to 12 As shown, the optical imaging lens of the third embodiment of the present application is described. Figure 8 A schematic structural diagram of an optical imaging lens according to a third embodiment is shown.

[0101] like Figure 8As shown, the optical imaging lens includes, from the object side to the image side, a lens barrel P0, a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a third lens E3, a third spacing element P3, a fourth lens E4, and a fourth spacing element P4.

[0102] The first lens E1 has positive focal power, the object side surface S1 of the first lens is concave, and the image side surface S2 of the first lens is convex. The second lens E2 has positive focal power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens E3 has positive focal power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is convex. The fourth lens E4 has negative focal power, the object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is concave. The filter has an object side surface S9 of the filter and an image side surface S10 of the filter, and the protective glass has an object side surface S11 of the protective glass and an image side surface S12 of the protective glass. The light from the object passes through each surface S1 to S12 in sequence and is finally imaged on the imaging surface S13.

[0103] Table 4 shows the basic structural parameters of the optical imaging lens of Example 3, wherein the units of the curvature radius, thickness / distance, effective radius and focal length are all millimeters (mm).

[0104] Face number Surface type Radius of curvature thickness Refractive Index Abbe number Cone coefficient OBJ Spherical endless endless STO Spherical endless 0.9152 S1 Aspheric -3.8254 1.2781 1.52 64.00 -0.7005 S2 Aspheric -3.9762 0.0250 0.0924 S3 Aspheric 3.0519 1.6594 1.66 20.40 -0.9779 S4 Aspheric 2.4704 2.2617 -1.0214 S5 Aspheric 9.5092 4.9202 1.52 64.00 0.5918 S6 Aspheric -4.5000 0.1990 -0.9030 S7 Aspheric 4.2290 1.4265 1.66 20.40 -0.5666 S8 Aspheric 3.0146 1.2971 -1.0172 S9 Spherical endless 0.5000 1.52 64.20 S10 Spherical endless 0.5136 S11 Spherical endless 0.5000 1.52 64.20 S12 Spherical endless 0.4998 S13 Spherical endless

[0105] Table 4

[0106] Table 5 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 3, wherein each aspherical surface shape can be defined by formula (1) given in the above Example 1. In this embodiment, the object side surface and image side surface of the first to fourth lenses are all aspherical surfaces.

[0107]

[0108] Table 5

[0109] Fig. 9 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 optical imaging lens. Fig.10 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.11 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.12 The magnification chromatic aberration curve of the optical imaging lens of Example 3 is shown, which indicates the degree to which the focusing points of light rays of different wavelengths do not completely overlap.

[0110] according to Figures 9 to 12It can be seen that the optical imaging lens provided in the third embodiment can achieve good imaging quality.

[0111] Embodiment 4

[0112] like Fig.13 As shown, the optical imaging lens of the fourth embodiment of the present application is described, which is different from the third embodiment in that the distances and thicknesses between the spacer elements, lenses, lens barrel P0, etc. are different.

[0113] Fig.13 The schematic diagram of the structure of the optical imaging lens of the fourth embodiment is shown. For the sake of brevity, some descriptions similar to those of the third embodiment are omitted. In this embodiment, the difference between the outer diameter and the inner diameter of the spacer element is small, which is beneficial to the transmission of light.

[0114] Embodiment 5

[0115] like Figures 14 to 18 As shown, the optical imaging lens of the fifth embodiment of the present application is described. Fig.14 A schematic structural diagram of an optical imaging lens according to a fifth embodiment is shown.

[0116] like Fig.14 As shown, the optical imaging lens includes, from the object side to the image side, a lens barrel P0, a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a third lens E3, a third spacing element P3, a fourth lens E4, and a fourth spacing element P4.

[0117] The first lens E1 has positive focal power, the object side surface S1 of the first lens is concave, and the image side surface S2 of the first lens is convex. The second lens E2 has negative focal power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens E3 has positive focal power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is convex. The fourth lens E4 has negative focal power, the object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is concave. The filter has an object side surface S9 of the filter and an image side surface S10 of the filter, and the protective glass has an object side surface S11 of the protective glass and an image side surface S12 of the protective glass. The light from the object passes through each surface S1 to S12 in sequence and is finally imaged on the imaging surface S13.

[0118] Table 6 shows the basic structural parameters of the optical imaging lens of Example 5, wherein the units of the curvature radius, thickness / distance, effective radius and focal length are all millimeters (mm).

[0119] Face number Surface type Radius of curvature thickness Refractive Index Abbe number Cone coefficient OBJ Spherical endless endless STO Spherical endless 0.8854 S1 Aspheric -3.9061 1.2994 1.52 64.00 -0.6946 S2 Aspheric -3.9429 0.0385 0.0483 S3 Aspheric 3.3393 1.8152 1.66 20.40 -0.9590 S4 Aspheric 2.4778 1.0811 -1.0352 S5 Aspheric 7.5722 5.9655 1.52 64.00 0.7066 S6 Aspheric -4.5041 0.1969 -1.0264 S7 Aspheric 4.4407 1.5371 1.66 20.40 -0.4985 S8 Aspheric 3.1633 1.1631 -1.0030 S9 Spherical endless 0.5000 1.52 64.20 S10 Spherical endless 0.5136 S11 Spherical endless 0.5000 1.52 64.20 S12 Spherical endless 0.4993 S13 Spherical endless

[0120] Table 6

[0121] Table 7 shows the coefficients of the higher order terms of each aspheric mirror surface that can be used in Example 5, wherein the surface type of each aspheric surface can be defined by the formula (1) given in the above Example 1. In this embodiment, the object side surface and the image side surface of the first lens to the fourth lens are all aspheric surfaces.

[0122]

[0123]

[0124] Table 7

[0125] Fig.15 The axial chromatic aberration curve of the optical imaging lens of Example 5 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Fig.16 The astigmatism curve of the optical imaging lens of Example 5 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.17 The distortion curve of the optical imaging lens of Example 5 is shown, which represents the distortion magnitude values ​​corresponding to different field angles. Fig.18 The chromatic aberration curve of the optical imaging lens of Example 5 is shown, which indicates the degree to which the focusing points of light rays of different wavelengths do not completely overlap.

[0126] according to Figures 15 to 18 It can be seen that the optical imaging lens provided in Example 5 can achieve good imaging quality.

[0127] Embodiment 6

[0128] like Fig.19 As shown, the optical imaging lens of the sixth embodiment of the present application is described, which differs from the fifth embodiment in that the distances and thicknesses between the spacer elements, lenses, lens barrel P0, etc. are different.

[0129] Fig.19 The structure diagram of the optical imaging lens of Example 6 is shown. For the sake of brevity, some descriptions similar to those of Example 5 are omitted. In this embodiment, the second spacing element has a certain thickness rather than a thinner sheet-shaped spacing element, so that the second lens and the third lens can meet the processing requirements while supplementing the axial spacing to ensure the stability of the bearing.

[0130] Embodiment 7

[0131] like Figure 20 to Figure 24 As shown, the optical imaging lens of the seventh embodiment of the present application is described. Fig. 20 A schematic structural diagram of an optical imaging lens according to a seventh embodiment is shown.

[0132] like Fig. 20As shown, the optical imaging lens includes, from the object side to the image side, a lens barrel P0, a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a third lens E3, a third spacing element P3, a fourth lens E4, and a fourth spacing element P4.

[0133] The first lens E1 has positive focal power, the object side surface S1 of the first lens is concave, and the image side surface S2 of the first lens is convex. The second lens E2 has positive focal power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens E3 has positive focal power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is convex. The fourth lens E4 has negative focal power, the object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is concave. The filter has an object side surface S9 of the filter and an image side surface S10 of the filter, and the protective glass has an object side surface S11 of the protective glass and an image side surface S12 of the protective glass. The light from the object passes through each surface S1 to S12 in sequence and is finally imaged on the imaging surface S13.

[0134] Table 8 shows the basic structural parameters of the optical imaging lens of Example 7, wherein the units of the curvature radius, thickness / distance, effective radius and focal length are all millimeters (mm).

[0135] Face number Surface type Radius of curvature thickness Refractive Index Abbe number Cone coefficient OBJ Spherical endless endless STO Spherical endless 0.8750 S1 Aspheric -3.8338 0.9909 1.52 64.00 -0.7287 S2 Aspheric -3.9868 0.3500 0.0838 S3 Aspheric 3.0333 1.5684 1.66 20.40 -0.9843 S4 Aspheric 2.4811 2.1965 -1.0294 S5 Aspheric 9.0213 5.0356 1.52 64.00 0.4473 S6 Aspheric -4.4953 0.1385 -0.9034 S7 Aspheric 4.2723 1.5150 1.66 20.40 -0.5650 S8 Aspheric 3.0427 1.3122 -1.0253 S9 Spherical endless 0.5000 1.52 64.20 S10 Spherical endless 0.5136 S11 Spherical endless 0.5000 1.52 64.20 S12 Spherical endless 0.4985 S13 Spherical endless

[0136] Table 8

[0137] Table 9 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 7, wherein each aspherical surface type can be defined by formula (1) given in the above Example 1. In this embodiment, the object side surface and image side surface of the first to fourth lenses are all aspherical surfaces.

[0138]

[0139] Table 9

[0140] Fig.21 The axial chromatic aberration curve of the optical imaging lens of Example 7 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Fig. 22 The astigmatism curve of the optical imaging lens of Example 7 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.23 The distortion curve of the optical imaging lens of Example 7 is shown, which represents the distortion magnitude values ​​corresponding to different field angles. Fig.24 The chromatic aberration curve of the optical imaging lens of Example 7 is shown, which indicates the degree to which the focusing points of light rays of different wavelengths do not completely overlap.

[0141] according to Figure 21 to Figure 24It can be seen that the optical imaging lens provided in Example 7 can achieve good imaging quality.

[0142] Embodiment 8

[0143] like Fig.25 As shown, the optical imaging lens of the eighth embodiment of the present application is described, which differs from the seventh embodiment in that the distances and thicknesses between the spacer elements, lenses, lens barrel P0, etc. are different.

[0144] Fig.25 The structure diagram of the optical imaging lens of the eighth embodiment is shown. For the sake of brevity, some descriptions similar to those of the seventh embodiment are omitted. In this embodiment, the thickness of the lens barrel is significantly increased, which is beneficial to the stability of the optical imaging lens.

[0145] In summary, Embodiments 1 to 8 respectively satisfy the relationships shown in Table 10.

[0146] Conditional / Example 1 2 3 4 5 6 7 8 CP1 / (CT1+CT2) 1.11 1.06 1.06 1.06 0.93 0.89 1.34 1.34 EP01 / |SAG11| 3.56 3.60 3.20 3.21 3.78 3.78 3.30 3.30 D1s / (R1*N1) -1.81 -1.49 -1.75 -1.62 -1.68 -1.72 -1.73 -1.64 D1m / R4 4.22 3.89 4.29 3.97 4.20 4.28 4.21 4.13 D2m / R5 1.41 1.25 1.20 1.14 1.53 1.47 1.26 1.24 R5*N3 / d3s 1.19 1.20 1.45 1.48 1.27 1.27 1.37 1.37 D3m / R7 / (D3s / R6) -1.07 -0.98 -1.10 -1.10 -1.05 -1.06 -1.09 -1.22 f4 / (CP3+CT4) -4.35 -4.43 -5.52 -5.51 -6.41 -6.58 -5.70 -5.77 L / CT3 3.03 3.07 3.23 3.37 2.72 2.72 3.31 3.31 (D0m-D0s) / ImgH 1.17 1.07 1.16 0.48 0.98 0.98 1.10 0.32 (d0m-d0s) / ImgH 1.01 1.16 1.30 1.19 1.17 1.17 1.23 1.23 f4 / T34 -105.74 -105.74 -153.15 -153.15 -165.55 -165.55 -231.04 -231.04 R7 / d3m 0.46 0.44 0.42 0.42 0.45 0.46 0.41 0.42

[0147] Table 10

[0148] Table 11 shows the effective focal lengths f1 to f4 of each lens of the optical imaging lens of Examples 1 to 8 and the sag height SAG11 of the object-side surface of the first lens.

[0149] Parameters / Examples 1 2 3 4 5 6 7 8 f1(mm) -171.23 -171.23 107.00 107.00 75.62 75.62 166.44 166.44 f2(mm) 72.71 72.71 195.91 195.91 -82.52 -82.52 216.25 216.25 f3(mm) 6.64 6.64 6.82 6.82 6.67 6.67 6.75 6.75 f4(mm) -23.47 -23.47 -30.48 -30.48 -32.59 -32.59 -32.00 -32.00 SAG11(mm) -0.61 -0.61 -0.72 -0.72 -0.69 -0.69 -0.68 -0.68

[0150] Table 11

[0151] Table 12 lists some structural parameters of the optical imaging lenses of Examples 1 to 8, with the unit being mm.

[0152]

[0153]

[0154] Table 12

[0155] 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.

[0156] 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.

[0157] 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.

[0158] 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.

[0159] 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: The optical imaging lens has four lenses with optical power, and the optical imaging lens includes: A lens group, wherein the lens group includes first to fourth lenses arranged in sequence from the object side to the image side of the optical imaging lens; a spacer element group, the spacer element group at least comprising a first spacer element located between the first lens and the second lens and at least partially in contact with the image side surface of the first lens, a second spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens, and a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens; a lens barrel, wherein the lens group and the spacer element group are accommodated in the lens barrel; The effective focal length f4 of the fourth lens and the on-axis distance T34 between the image side surface of the third lens and the object side surface of the fourth lens satisfy the following: -231.04≤f4 / T34≤-105.74; The effective focal length f4 of the fourth lens, the center thickness CT4 of the fourth lens, and the maximum thickness CP3 of the third spacing element satisfy: -6.58≤f4 / (CP3+CT4)≤-4.

35.

2. The optical imaging lens according to claim 1, wherein: The maximum thickness CP1 of the first spacer element, the center thickness CT1 of the first lens, and the center thickness CT2 of the second lens satisfy the following: 0.89≤CP1 / (CT1+CT2)≤1.

34.

3. The optical imaging lens according to claim 1, wherein: The on-axis distance EP01 between the object-side end surface of the lens barrel and the object-side surface of the first spacing element and the sag height SAG11 of the object-side surface of the first lens satisfy the following: 3.20≤EP01 / |SAG11|≤3.

78.

4. The optical imaging lens according to claim 1, wherein: The first lens is made of a glass aspheric surface, and the outer diameter D1s of the object side surface of the first spacer element, the curvature radius R1 of the object side surface of the first lens, and the refractive index N1 of the first lens satisfy: -1.81≤D1s / (R1*N1)≤-1.

49.

5. 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 D1m of the image side surface of the first spacer element satisfy the following: 3.89≤D1m / R4≤4.

29.

6. The optical imaging lens according to claim 1, wherein: An outer diameter D2m of the image-side surface of the second spacer element and a curvature radius R5 of the object-side surface of the third lens satisfy the following relationship: 1.14≤D2m / R5≤1.

53.

7. The optical imaging lens according to claim 1, wherein: The third lens is made of a glass aspheric surface, and the curvature radius R5 of the object side surface of the third lens, the refractive index N3 of the third lens, and the inner diameter d3s of the object side surface of the third spacer element satisfy the following: 1.19≤R5*N3 / d3s≤1.

48.

8. The optical imaging lens according to claim 1, wherein: An outer diameter D3m of the image side surface of the third spacing element, an outer diameter D3s of the object side surface of the third spacing element, a curvature radius R6 of the image side surface of the third lens, and a curvature radius R7 of the object side surface of the fourth lens satisfy the following relationship: -1.22≤D3m / R7 / (D3s / R6)≤-0.

98.

9. The optical imaging lens according to any one of claims 1 to 8, characterized in that: The maximum height L of the lens barrel and the center thickness CT3 of the third lens satisfy the following: 2.72≤L / CT3≤3.

37.

10. The optical imaging lens according to any one of claims 1 to 8, characterized in that: The outer diameter D0m of the image side surface of the image side end surface of the lens barrel, the outer diameter D0s of the object side surface of the object side end surface of the lens barrel, and half the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens satisfy the following: 0.32≤(D0m-D0s) / ImgH≤1.

17.

11. The optical imaging lens according to any one of claims 1 to 8, characterized in that: The inner diameter d0s of the object side end surface of the lens barrel, the inner diameter d0m of the image side end surface of the lens barrel, and half the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens satisfy the following relationship: 1.01≤(d0m-d0s) / ImgH≤1.

30.

12. The optical imaging lens according to any one of claims 1 to 8, characterized in that: The third lens has positive refractive power, and the fourth lens has negative refractive power.

13. The optical imaging lens according to any one of claims 1 to 8, characterized in that: The object side surface of the first lens is concave, the image side surface of the first lens is convex, the object side surface of the second lens is convex, the image side surface of the second lens is concave, the object side surface of the third lens is convex, the image side surface of the third lens is convex, the object side surface of the fourth lens is convex, and the image side surface of the fourth lens is concave.

Images