Optical imaging lens

Abstract

The utility model provides an optical imaging lens, the number of the optical imaging lens is four, the optical imaging lens comprises a lens group, a spacing element group and a lens barrel, the lens group from the object side to the image side of the optical imaging lens comprises a first lens, a second lens, a third lens, a fourth lens and a fourth lens which are sequentially arranged at intervals; 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] This utility model relates to the field of optical imaging equipment technology, and more specifically, to an optical imaging lens. Background Technology

[0002] Environmental perception modules play a crucial role in autonomous driving technology. LiDAR, as a primary environmental perception solution, demonstrates significant advantages and broad application prospects in the field of autonomous driving due to its all-weather operation, low sensitivity to ambient light, and high ranging accuracy. In autonomous driving environments, optical imaging lenses need to maintain stable performance under various harsh conditions; therefore, the assembly stability of optical imaging lenses must be considered during the design phase. LiDAR typically uses near-infrared light for detection, so the optical imaging lens at the receiving end must be able to operate in the near-infrared band to ensure sufficient signal strength and clarity. In traditional four-element optical imaging lens designs, the rear lens has a significant impact on the final imaging effect, easily leading to extreme lens shape designs and large differences in thickness between the lens center and edges, affecting assembly stability. However, due to the mutual constraints of the structural designs among multiple lenses, even with a reasonable third lens shape, the structure of the fourth lens is difficult to meet the requirements of molding, resulting in poor assembly stability. In other words, how to control the shape of the fourth lens while ensuring the molding and assembly of the third lens, and balancing the molding and assembly stability of the two rear lenses, is a crucial issue. Utility Model Content

[0003] The main objective of this invention is to provide an optical imaging lens to solve the problem of how to balance the shaping and assembly stability of the two rear lenses in existing optical imaging lenses.

[0004] To achieve the above objectives, according to one aspect of the present invention, an optical imaging lens is provided, comprising four lenses having optical power. The optical imaging lens includes: a lens group comprising, from the object side to the image side, a first lens to a fourth lens arranged sequentially at intervals; and a spacer element group, comprising at least a first spacer element located between the first and second lenses and at least partially in contact with the image side of the first lens, and a second spacer element located between the second and third lenses and at least partially in contact with the image side of the second lens. A third spacer element is located between the third lens and the fourth lens and is at least partially in contact with the image-side surface of the third lens; a lens barrel, a lens group, and a spacer element group are housed within 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 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 spacer element satisfy the following: -6.58≤f4 / (CP3+CT4)≤-4.35.

[0005] According to another aspect of the present invention, an optical imaging lens is provided, the optical imaging lens having four lenses with optical power, the optical imaging lens comprising: a lens group, the lens group from the object side to the image side of the optical imaging lens comprising a first lens to a fourth lens arranged sequentially at intervals; a spacer element group, the spacer element group comprising 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 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 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 of the third lens; a lens barrel, the lens group and the spacer element group being housed within 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: 0.89≤CP1 / (CT1+CT2)≤1.34; the radius of curvature R4 of the image side of the second lens and the outer diameter D1m of the image side of the first spacer element satisfy: 3.89≤D1m / R4≤4.29.

[0006] According to another aspect of the present invention, an optical imaging lens is provided, the optical imaging lens having four lenses with optical power, the optical imaging lens comprising: a lens group, the lens group from the object side to the image side of the optical imaging lens comprising a first lens to a fourth lens arranged sequentially at intervals; and a spacer element group, the spacer element group comprising 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, and 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. The lens comprises an element, a third spacer element located between the third and fourth lenses and in at least partial contact with the image-side surface of the third lens; a lens barrel, a lens group, and a spacer element group are housed within 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 the following: -231.04≤f4 / T34≤-105.74; the radius of curvature R7 of the object-side surface of the fourth lens and the inner diameter d3m of the image-side surface of the third spacer element satisfy the following: 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 the following condition: 0.89≤CP1 / (CT1+CT2)≤1.34.

[0008] Furthermore, the axial distance EP01 between the object-side end face of the lens barrel and the object-side surface of the first spacer element, and the sagitta SAG11 of the object-side surface of the first lens satisfy the following condition: 3.20≤EP01 / |SAG11|≤3.78.

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

[0010] Furthermore, the radius of curvature 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 condition: 3.89≤D1m / R4≤4.29.

[0011] Furthermore, the outer diameter D2m of the image side of the second spacer element and the radius of curvature R5 of the object side of the third lens satisfy the following condition: 1.14≤D2m / R5≤1.53.

[0012] Furthermore, the third lens is made of aspherical glass, 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 the following condition: 1.19≤R5*N3 / d3s≤1.48.

[0013] Furthermore, the outer diameter D3m of the image side of the third spacer element, the outer diameter D3s of the object side of the third spacer element, the radius of curvature R6 of the image side of the third lens, and the radius of curvature R7 of the object side of the fourth lens satisfy the following: -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 the following condition: 2.72≤L / CT3≤3.37.

[0015] Furthermore, the outer diameter D0m of the image-side end face of the lens barrel, the outer diameter D0s of the object-side end face 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 condition: 0.32≤(D0m-D0s) / ImgH≤1.17.

[0016] Furthermore, the inner diameter d0s of the object-side end face of the lens barrel, the inner diameter d0m of the image-side end face 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 condition: 1.01≤(d0m-d0s) / ImgH≤1.30.

[0017] Furthermore, the third lens has positive optical power, and the fourth lens has negative optical power.

[0018] Furthermore, 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] Applying the technical solution of this utility model, 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. From the object side to the image side of the optical imaging lens, the lens group includes a first lens to a fourth lens arranged in sequence. 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 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 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 of the third lens. The lens group and the spacer element group are housed in the lens barrel. The effective focal length f4 of the fourth lens and the axial distance T34 between the image side of the third lens and the object side 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 spacer element satisfy the following: -6.58≤f4 / (CP3+CT4)≤-4.35.

[0020] The optical imaging lens of this application uses four lenses with optical power, arranged sequentially from the first to the fourth lens at intervals. To ensure the assembly stability of the optical imaging lens, by controlling f4 / T34 within a reasonable range, the radius of curvature of the image-side surface of the third lens is kept relatively large, thereby keeping the edge thickness of the third lens within a suitable range, improving the stability and reliability of the third lens molding, and ultimately enhancing the assembly stability of the third lens. However, under this condition, the radius of curvature of the object-side surface of the fourth lens becomes larger, resulting in a phenomenon where the fourth lens is thicker in the middle and thinner at the edges within its effective diameter range, causing instability in the assembly of the fourth lens. Therefore, by controlling f4 / (CP3+CT4) within a reasonable range, the focal length and center thickness of the fourth lens are further limited, avoiding a decrease in the assembly stability of the fourth lens due to the improved assembly stability of the third lens. This 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. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0022] Figure 1 A schematic diagram showing partial parameters of the optical imaging lens of any optional embodiment of the present invention is provided.

[0023] Figure 2 A schematic diagram of the structure of the optical imaging lens according to Embodiment 1 of this utility model is shown;

[0024] Figures 3 to 6 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens of Embodiment 1 of this utility model are shown respectively.

[0025] Figure 7 A schematic diagram of the structure of the optical imaging lens of Embodiment 2 of this utility model is shown;

[0026] Figure 8 A schematic diagram of the structure of the optical imaging lens of Embodiment 3 of this utility model is shown;

[0027] Figures 9 to 12 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens of Embodiment 3 of this utility model are shown respectively.

[0028] Figure 13 A schematic diagram of the structure of the optical imaging lens of Embodiment 4 of this utility model is shown;

[0029] Figure 14 A schematic diagram of the structure of the optical imaging lens of Embodiment 5 of this utility model is shown;

[0030] Figures 15 to 18 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens of Embodiment 5 of this utility model are shown respectively.

[0031] Figure 19 A schematic diagram of the structure of the optical imaging lens of Embodiment Six of this utility model is shown;

[0032] Figure 20 A schematic diagram of the structure of the optical imaging lens of Embodiment Seven of this utility model is shown;

[0033] Figures 21 to 24 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens of Embodiment 7 of this utility model are shown respectively.

[0034] Figure 25 A schematic diagram of the structure of the optical imaging lens of Embodiment 8 of this utility model is shown;

[0035] Figure 26 The tolerance analysis results of an optical imaging lens of this utility model are shown under the conditions of f4 / T34=-105.74 and f4 / (CP3+CT4)=-4.35;

[0036] Figure 27 The tolerance analysis results of an optical imaging lens in the prior art are shown under the conditions of f4 / T34=-105.74 and f4 / (CP3+CT4)=-1.25;

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

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

[0039] P0, Lens tube; E1, First lens; P1, First spacer element; E2, Second lens; P2, Second spacer element; E3, Third lens; P3, Third spacer element; E4, Fourth lens; P4, Fourth spacer 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 Implementation

[0040] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0041] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0042] In this utility model, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0043] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0044] In the accompanying 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 illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not drawn strictly to scale.

[0045] In this paper, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of that convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of that concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The determination of the surface shape in the paraxial region can be based on the judgment method commonly used by those knowledgeable in the field, using the R value (R refers to the radius of curvature of the paraxial region, usually the R value in the lens database of optical software) to determine convexity or concavity. For the eye-side surface, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; for the display-side surface, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex.

[0046] like Figures 1 to 26As shown, 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 from the object side to the image side of the optical imaging lens includes a first lens to a fourth lens arranged in sequence. 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 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 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 of the third lens. The lens group and the spacer element group are housed in the lens barrel. The effective focal length f4 of the fourth lens and the axial distance T34 between the image side of the third lens and the object side 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 spacer element satisfy the following: -6.58≤f4 / (CP3+CT4)≤-4.35.

[0047] The optical imaging lens of this application uses four lenses with optical power, arranged sequentially from the first to the fourth lens at intervals. To ensure the assembly stability of the optical imaging lens, by controlling f4 / T34 within a reasonable range, the radius of curvature of the image-side surface of the third lens is kept relatively large, thereby keeping the edge thickness of the third lens within a suitable range, improving the stability and reliability of the third lens molding, and ultimately enhancing the assembly stability of the third lens. However, under this condition, the radius of curvature of the object-side surface of the fourth lens becomes larger, resulting in a phenomenon where the fourth lens is thicker in the middle and thinner at the edges within its effective diameter range, causing instability in the assembly of the fourth lens. Therefore, by controlling f4 / (CP3+CT4) within a reasonable range, the focal length and center thickness of the fourth lens are further limited, avoiding a decrease in the assembly stability of the fourth lens due to the improved assembly stability of the third lens. This 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 between an optional embodiment of this application and optical imaging lenses in the prior art.

[0049]

[0050]

[0051] Table 1

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

[0053] The optical imaging lens of this application controls the f4 / T34 ratio within a reasonable range, such as... Figure 26 As shown, the third lens has a large radius of curvature on the image side, and the edge thickness of the third lens meets its requirements for stability and reliability in molding. The assembly of the third lens is stable, and the final optical imaging lens has small assembly tolerance and 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 ratio: 0.89 ≤ CP1 / (CT1+CT2) ≤ 1.34. Since CP1 can be considered as the sum of the image-side sag of the first lens, the air gap between the first and second lenses, and the object-side sag of the second lens, controlling the size of CP1 also reflects the sag of the first and second lenses. The sag describes the degree of deviation of the lens surface from its central axis and is crucial to the optical performance of the lens. When the ratio of CP1 / (CT1+CT2) is less than 0.89, the sag of the image-side of the first lens and the sag of the object-side of the second lens decrease, weakening the refractive power of light. This necessitates thickening the third lens to compensate, leading to an increase in the thickness of the third lens and affecting its molding process. When the ratio of CP1 / (CT1+CT2) is greater than 1.34, the sag of the image-side surface of the first lens and the sag of the object-side surface of the second lens are too large. This results in poor surface shape and excessive wavefront aberration in the second lens, affecting the final imaging effect of the optical imaging lens. By controlling CP1 / (CT1+CT2) within a reasonable range, the sag of the image-side surface of the first lens, the sag of the object-side surface of the second lens, and the air gap between the first and second lenses can be kept within a reasonable range. This ensures good forming effect for each lens, helps improve the stability of optical imaging lens assembly, and reduces assembly tolerances caused by lens shape mismatch.

[0055] It should be noted that the sag of the lens surface represents the axial distance from the point where the lens surface intersects the optical axis to the vertex of the effective radius of the lens surface.

[0056] In this embodiment, the axial distance EP01 between the object-side end face of the lens barrel and the object-side surface of the first spacer element, and the sagitta SAG11 of the object-side surface of the first lens, satisfy the following condition: 3.20 ≤ EP01 / |SAG11| ≤ 3.78. EP01 can be considered as the sum of the edge thickness of the object-side end face of the lens barrel and the edge thickness of the first lens, and |SAG11| is the sagitta length of the object-side surface of the first lens. When the ratio of EP01 / |SAG11| is less than 3.20, the edge thickness of the first lens is small while the sagitta of the object-side surface of the first lens is large, leading to a risk of poor molding of the first lens. When the ratio of EP01 / |SAG11| is greater than 3.78, the sagitta of the object-side surface of the first lens is small while the edge thickness is large, and there is a phenomenon of edge curvature of the effective diameter of the first lens, making it difficult to guarantee the molding of the first lens. By controlling EP01 / |SAG11| within a reasonable range, the sagitta of the object-side surface of the first lens can be controlled, making it less prone to edge warping and other phenomena during molding, thus ensuring the stability and quality of the first lens molding. Simultaneously, proper control of EP01 / |SAG11| helps reduce tolerances during the assembly of optical imaging lenses, making the first lens more stable during assembly and reducing optical performance degradation caused by assembly errors. Furthermore, proper control of the sagitta of the object-side surface of the first lens and the relative position of the object-side end face of the lens barrel ensures that the first lens is fixed in the correct position, reducing unnecessary stress and deformation.

[0057] In this embodiment, the first lens is made of aspherical glass. The outer diameter D1s of the object side of the first spacer element, the radius of curvature R1 of the object side of the first lens, and the refractive index N1 of the first lens satisfy the following relationship: -1.81 ≤ D1s / (R1*N1) ≤ -1.49. Since the first lens of the optical imaging lens is made of aspherical glass, and the aspherical curve of the image side of the first lens is prone to curvature, excessive curvature 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 of the first lens exhibits severe curvature, increasing the molding difficulty. By controlling D1s / (R1*N1) within a reasonable range, the shape of the first lens can be controlled to meet the requirements of molding, reducing curvature at the edges, thereby reducing the failure rate in the manufacturing process of the first lens and improving the production yield of the optical imaging lens. Furthermore, 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 under the condition of meeting the structural design requirements.

[0058] In this embodiment, the radius of curvature 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 relationship: 3.89 ≤ D1m / R4 ≤ 4.29. When D1m / R4 is too small, the sag of the image-side surface of the second lens is too large, affecting the shaping 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 aspherical curve becomes flatter, resulting in poor shaping of the third lens. By controlling D1m / R4 within a reasonable range, it is possible to ensure that the image-side surface of the second lens has an appropriate radius of curvature to maintain good refractive power, while avoiding excessive light refraction angle caused by an excessively 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, a reasonable range of D1m / R4 can ensure a smooth transition of light when it is transmitted from the first lens to the second lens, reducing step differences and assembly tolerances, and improving the stability and reliability of the optical imaging lens.

[0059] In this embodiment, the outer diameter D2m of the image side of the second spacer element and the radius of curvature R5 of the object side of the third lens satisfy the following ratio: 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, posing a risk during the assembly of 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 increased, causing the outer diameter of the third lens to expand further, increasing the volume of the optical imaging lens. Simultaneously, due to the increased step difference between the second and third spacers, 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, sufficient contact area between the second spacer element and the third lens can be ensured, providing sufficient support and positioning during assembly. This prevents the third lens from shifting or becoming 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 is made of aspherical glass. The radius of curvature 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 relationship: 1.19 ≤ R5*N3 / d3s ≤ 1.48. When the third lens is made of glass, light is easily reflected by the third spacer element, forming 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, posing a risk of assembly instability. When the ratio of R5*N3 / d3s is too large, the inner diameter of the object-side surface of the third spacer element is too small, causing light to be 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 generation of stray light at the sharp corners of the inner diameter of the third spacer element can be effectively avoided, reducing unexpected light spots and interference, thereby improving the imaging quality of the optical imaging lens.

[0061] In this embodiment, the outer diameter D3m of the image side of the third spacer element, the outer diameter D3s of the object side of the third spacer element, the radius of curvature R6 of the image side of the third lens, and the radius of curvature R7 of the object side of the fourth lens satisfy the following: -1.22 ≤ D3m / R7 / (D3s / R6) ≤ -0.98. When D3m / R7 / (D3s / R6) is not within this range, there is a risk that the radius of curvature of the object side of the fourth lens is too large or too small. If the edge thickness is too thin, it may cause the fourth lens to break or deform during the molding process, while if the edge is too thick, it 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 of the third lens and the curvature radius of the object side of the fourth lens can be kept within a reasonable range. This ensures a more reasonable transition design between the third and fourth lenses, avoids edge thickness problems caused by excessively large or small curvature radius of the object side of the fourth lens, and reduces lens displacement and uneven stress distribution caused by excessive step differences during assembly, thereby improving the assembly yield and stability of optical imaging lenses.

[0062] In this embodiment, the maximum height L of the lens barrel and the center thickness CT3 of the third lens satisfy the following ratio: 2.72 ≤ L / CT3 ≤ 3.37. L refers to the maximum height of the entire lens barrel, which is the distance along the optical axis from the object-side end face to the image-side end face of the optical imaging lens. Controlling L / CT3 within a reasonable range helps control the ratio of the thickness of the third lens to the maximum height of the lens barrel. A larger air gap between the third and fourth lenses makes the selection and matching of the third spacer element easier, and provides greater potential for improving stray light. This allows for better control over the interaction between the third and fourth lenses, which is more conducive to improving the overall stray light quality of the optical imaging lens. Furthermore, the maximum height of the lens barrel not only affects the appearance and size of the optical imaging lens but also relates to its strength and heat dissipation performance. A higher L value helps enhance the structural stability of the lens barrel and reduces the impact of external impacts on the lens. Simultaneously, by controlling the L / CT3 ratio, a compact, sufficiently strong, and well-heat-dissipated lens barrel can be designed without sacrificing the optical performance of the third lens.

[0063] In this embodiment, the outer diameter D0m of the image-side end face of the lens barrel, the outer diameter D0s of the object-side end face of the lens barrel, and ImgH, half the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens, satisfy the following condition: 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, resulting in poor structural strength and impact resistance. Controlling (D0m - D0s) / ImgH within a reasonable range helps to meet the requirements for appearance control of the optical imaging lens. The outer diameter D0m of the image-side end face of the lens barrel is controlled by the size of the imaging surface of the lens in conjunction with the module motor, while the outer diameter D0s of the object-side end face of the lens barrel is mainly controlled by the size of the module window and the assembly support area. These dimensions collectively affect the appearance of the optical imaging lens. Under the condition of fixed optical effective aperture, the better the uniformity of the lens barrel wall thickness, the more stable the reliability of the optical imaging lens.

[0064] In this embodiment, the inner diameter d0s of the object-side end face of the lens barrel, the inner diameter d0m of the image-side end face of the lens barrel, and ImgH (half the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens) satisfy the following ratio: 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, leading to difficulties in forming the first lens due to excessively long structural parts of the first and second lenses, or instability during the assembly of the optical imaging lens due to excessively short structural parts of the third and fourth lenses. 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 spacer element, requiring replacement with 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 optical power, and the fourth lens has negative optical power. By combining the positive and negative focal lengths of the third and fourth lenses, the optical imaging lens can maintain good imaging performance over a wider wavelength range, reduce aberrations, and improve image sharpness and color reproduction. Furthermore, the combination of positive and negative lenses can reduce the overall length and volume of the optical imaging lens through optimization of the internal optical path, achieving a compact structure.

[0066] In this embodiment, the object-side surface of the first lens is concave, and the image-side surface is convex; the object-side surface of the second lens is convex, and the image-side surface is concave; the object-side surface of the third lens is convex, and the image-side surface is convex; the object-side surface of the fourth lens is convex, and the image-side surface is concave. By configuring the lens surface shapes, chromatic aberration, especially magnification chromatic aberration, can be effectively corrected. The combination of concave and convex surfaces allows control over the refraction angles of different wavelengths of light, enabling more accurate light convergence and reducing color fringing or blurring caused by dispersion. Furthermore, the concave object-side surface of the first lens effectively widens the angle of incident light, while the convex image-side surface helps converge the light. The second lens further controls the light path, the third lens converges the light again, and the fourth lens finally diverges the light to the imaging surface. This configuration helps to precisely control the direction of light, ensuring that the light reaches the imaging surface in the best possible condition.

[0067] Optionally, the optical imaging lens in the embodiments of this application can be simulated using software and / or tools such as ZEMAX and CODEV. Optionally, the optical imaging lens can be simulated using ZEMAX software. During the simulation process using software and / or tools as described above, the surface profile of each lens can be appropriately adjusted based on the surface profile of the software and / or tools used.

[0068] In this embodiment, each lens can be optionally configured as a tangent lens. The outer diameter surface of the tangent lens has a tangent structure and a non-tangent structure, with the outer diameter of the tangent structure being smaller than the outer diameter of the non-tangent structure. The outer diameter of the tangent lens typically refers to the outer diameter of the non-tangent structure.

[0069] In this embodiment, each spacer element can be optionally configured as a truncated spacer element. The outer ring surface of the truncated spacer element has a truncated portion and a non-truncated portion, with the outer diameter of the truncated portion being smaller than the outer diameter of the non-truncated portion. The outer diameter of the truncated spacer element typically refers to the maximum outer diameter of the non-truncated portion.

[0070] In another optional embodiment of this application, an optical imaging lens is also 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 from the object side to the image side of the optical imaging lens includes a first lens to a fourth lens arranged in sequence at intervals. 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 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 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 of the third lens. The lens group and the spacer element group are housed in the lens barrel. 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 radius of curvature R4 of the image side of the second lens and the outer diameter D1m of the image side of the first spacer element satisfy the following: 3.89≤D1m / R4≤4.29.

[0071] The optical imaging lens of this application uses four lenses with optical power, arranged sequentially from the first to the fourth lens at intervals. To optimize the surface shape 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 and second lenses can be kept within a reasonable range. This results in good shaping of each lens, improving the stability of the optical imaging lens assembly and reducing assembly tolerances caused by lens shape mismatch. However, in this case, the refractive power of the first and second lenses weakens. By controlling D1m / R4 within a reasonable range, the image-side surface of the second lens has an appropriate radius of curvature to maintain good refractive power, while avoiding excessively large light refraction angles due to an excessively small radius of curvature on the image-side surface 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 from the above embodiments, which will not be elaborated here.

[0073] In another optional embodiment of this application, an optical imaging lens is also 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 from the object side to the image side of the optical imaging lens includes a first lens to a fourth lens arranged in sequence at intervals. 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 of the first lens, and a spacer element located between the second lens and the third lens and at least partially in contact with the image side of the second lens. A second spacer element, a third spacer element located between the third and fourth lenses and in at least partial contact with the image-side surface of the third lens; the lens group and the spacer element group are housed within 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 radius of curvature R7 of the object-side surface of the fourth lens and the inner diameter d3m of the image-side surface of the third spacer element satisfy: 0.41≤R7 / d3m≤0.46.

[0074] The optical imaging lens of this application uses four lenses with optical power, arranged sequentially from the first to the fourth lens at intervals. To ensure the assembly stability of the optical imaging lens, by controlling f4 / T34 within a reasonable range, an appropriate ratio between the focal length of the fourth lens and the air gap between the third and fourth lenses is ensured. This reduces fluctuations in optical parameters caused by temperature changes or stress, thereby improving the lens's stability under different environments. Furthermore, reasonable control of f4 / T34 allows for precise control of axial chromatic aberration and spherical aberration correction. The negative focal length characteristic of the fourth lens, combined with a specific air gap, helps to ensure consistent focusing of light of different wavelengths on the imaging surface, improving image quality. By controlling R7 / d3m within a reasonable range, the transition position of the effective diameter portion and structural portion of the fourth lens on the object side is more rationally controlled, avoiding large differences in the center and edge thickness of the fourth lens, optimizing the shaping and assembly stability of the fourth lens. Simultaneously, controlling d3m helps to intercept stray light between lenses, ensuring that light entering the fourth lens is effectively controlled, reducing scattered light, improving image contrast, and thus improving the efficiency and imaging quality of the optical imaging lens.

[0075] It should be noted that this embodiment also includes other conditional expressions from the above embodiments, which will not be elaborated here.

[0076] The optical imaging lens in this application may employ multiple lenses, such as the four lenses described above. In this application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. An aspherical lens is characterized by a continuously changing curvature from the lens center to the lens periphery. Unlike a spherical lens, which has a constant curvature from the lens center to the lens periphery, an aspherical lens has superior curvature radius characteristics, offering advantages in improving distortion aberrations and astigmatism. By using an aspherical lens, aberrations occurring during imaging can be eliminated as much as possible, thereby improving image quality.

[0077] However, those skilled in the art will understand that the number of lenses constituting the optical imaging lens can be varied to obtain the various results and advantages described herein without departing from the technical solutions claimed in this application. For example, although four lenses have been 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 showing the dimensions of an optical imaging lens according to this application is provided. Figure 1 The parameters D1s, d3s, EP01, etc., are indicated to provide a clear and intuitive understanding of their meaning. To facilitate the description of the optical imaging lens and the specific lens shape, these parameters will not be shown in the accompanying drawings when describing specific embodiments.

[0079] The following description, with reference to the accompanying drawings, further illustrates examples of specific surface shapes and parameters of optical imaging lenses applicable to the above embodiments.

[0080] It should be noted that any one of the following embodiments, from Embodiment 1 to Embodiment 8, is applicable to all implementation methods of this application.

[0081] Example 1

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

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

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

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

[0086]

[0087]

[0088] Table 2

[0089] In Embodiment 1, the object-side surface and image-side surface of any one of the first lens E1 to the fourth lens E4 are aspherical surfaces. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0090]

[0091] Where x is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 2 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 3 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26 and A28 that can be used for each aspherical mirror S1-S8 in Example 1.

[0092]

[0093] Table 3

[0094] Figure 3 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 1 is shown, which represents the deflection 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 Embodiment 1 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 5 The distortion curve of the optical imaging lens of Embodiment 1 is shown, which represents the distortion magnitude value corresponding to different field of view angles. Figure 6 The magnification chromatic aberration curve of the optical imaging lens of Embodiment 1 is shown, which represents the degree to which the focal points of light of different wavelengths do not completely coincide.

[0095] according to Figures 3 to 6 As can be seen, the optical imaging lens given in Example 1 can achieve good imaging quality.

[0096] Example 2

[0097] like Figure 7 As shown, an optical imaging lens according to Embodiment 2 of this application is described. The difference between it and Embodiment 1 is that the distance and thickness between the various spacer elements, lenses, lens barrels P0, etc. are different.

[0098] Figure 7 A schematic diagram of the optical imaging lens of Embodiment 2 is shown. For simplicity, descriptions similar to those in Embodiment 1 are omitted. In this embodiment, the outer diameters of each lens and spacer element are small, which is beneficial for the miniaturization design of the optical imaging lens.

[0099] Example 3

[0100] like Figures 8 to 12 As shown, an optical imaging lens according to Embodiment 3 of this application is described. Figure 8 A schematic diagram of the optical imaging lens of Embodiment 3 is shown.

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

[0102] The first lens E1 has positive optical power, its object-side surface S1 is concave, and its image-side surface S2 is convex. The second lens E2 has positive optical power, its object-side surface S3 is convex, and its image-side surface S4 is concave. The third lens E3 has positive optical power, its object-side surface S5 is convex, and its image-side surface S6 is convex. The fourth lens E4 has negative optical power, its object-side surface S7 is convex, and its image-side surface S8 is concave. The filter has an object-side surface S9 and an image-side surface S10, and the protective glass has an object-side surface S11 and an image-side surface S12. Light from the object passes sequentially through surfaces S1 to S12 and is finally imaged onto the imaging surface S13.

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

[0104] Face number Surface type radius of curvature thickness Refractive index Abbe number Conic coefficient OBJ spherical endless endless STO spherical endless 0.9152 S1 aspherical -3.8254 1.2781 1.52 64.00 -0.7005 S2 aspherical -3.9762 0.0250 0.0924 S3 aspherical 3.0519 1.6594 1.66 20.40 -0.9779 S4 aspherical 2.4704 2.2617 -1.0214 S5 aspherical 9.5092 4.9202 1.52 64.00 0.5918 S6 aspherical -4.5000 0.1990 -0.9030 S7 aspherical 4.2290 1.4265 1.66 20.40 -0.5666 S8 aspherical 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 higher-order coefficients that can be used for each aspherical mirror in Embodiment 3, wherein each aspherical surface shape can be defined by formula (1) given in Embodiment 1 above. In this embodiment, the object-side and image-side surfaces of the first to fourth lenses are all aspherical.

[0107]

[0108] Table 5

[0109] Figure 9 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 3 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 10 The astigmatism curve of the optical imaging lens of Embodiment 3 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 11 The distortion curve of the optical imaging lens of Embodiment 3 is shown, which represents the distortion magnitude value corresponding to different field of view angles. Figure 12 The magnification chromatic aberration curve of the optical imaging lens of Embodiment 3 is shown, which represents the degree to which the focal points of light of different wavelengths do not completely coincide.

[0110] according to Figures 9 to 12It can be seen that the optical imaging lens given in Example 3 can achieve good imaging quality.

[0111] Example 4

[0112] like Figure 13 As shown, an optical imaging lens according to Embodiment 4 of this application is described. The difference between this lens and Embodiment 3 is that the distances and thicknesses between the various spacer elements, lenses, lens barrels, etc., are different.

[0113] Figure 13 A schematic diagram of the optical imaging lens of Embodiment 4 is shown. For the sake of brevity, descriptions similar to those in Embodiment 3 are omitted. In this embodiment, the difference between the outer and inner diameters of the spacer element is small, which is beneficial for light transmission.

[0114] Example 5

[0115] like Figures 14 to 18 As shown, an optical imaging lens according to Embodiment 5 of this application is described. Figure 14 A schematic diagram of the optical imaging lens of Embodiment 5 is shown.

[0116] like Figure 14 As shown, the optical imaging lens includes, from the object side to the image side, the following components in sequence: lens barrel P0, first lens E1, first spacer element P1, second lens E2, second spacer element P2, third lens E3, third spacer element P3, fourth lens E4, and fourth spacer element P4.

[0117] The first lens E1 has positive optical power, its object-side surface S1 is concave, and its image-side surface S2 is convex. The second lens E2 has negative optical power, its object-side surface S3 is convex, and its image-side surface S4 is concave. The third lens E3 has positive optical power, its object-side surface S5 is convex, and its image-side surface S6 is convex. The fourth lens E4 has negative optical power, its object-side surface S7 is convex, and its image-side surface S8 is concave. The filter has an object-side surface S9 and an image-side surface S10, and the protective glass has an object-side surface S11 and an image-side surface S12. Light from the object passes sequentially through surfaces S1 to S12 and is finally imaged onto the imaging surface S13.

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

[0119] Face number Surface type radius of curvature thickness Refractive index Abbe number Conic coefficient OBJ spherical endless endless STO spherical endless 0.8854 S1 aspherical -3.9061 1.2994 1.52 64.00 -0.6946 S2 aspherical -3.9429 0.0385 0.0483 S3 aspherical 3.3393 1.8152 1.66 20.40 -0.9590 S4 aspherical 2.4778 1.0811 -1.0352 S5 aspherical 7.5722 5.9655 1.52 64.00 0.7066 S6 aspherical -4.5041 0.1969 -1.0264 S7 aspherical 4.4407 1.5371 1.66 20.40 -0.4985 S8 aspherical 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 higher-order coefficients that can be used for each aspherical mirror in Embodiment 5, wherein each aspherical surface shape can be defined by formula (1) given in Embodiment 1 above. In this embodiment, the object-side and image-side surfaces of the first to fourth lenses are all aspherical.

[0122]

[0123]

[0124] Table 7

[0125] Figure 15 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 5 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 16 The astigmatism curve of the optical imaging lens of Embodiment 5 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 17 The distortion curve of the optical imaging lens of Embodiment 5 is shown, which represents the distortion magnitude value corresponding to different field of view angles. Figure 18 The magnification chromatic aberration curve of the optical imaging lens of Embodiment 5 is shown, which represents the degree to which the focal points of light of different wavelengths do not completely coincide.

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

[0127] Example 6

[0128] like Figure 19 As shown, an optical imaging lens according to Embodiment Six of this application is described. The difference between Embodiment Five and Embodiment Six is ​​that the distance and thickness between the various spacer elements, lenses, lens barrels, etc. are different.

[0129] Figure 19 A schematic diagram of the optical imaging lens of Embodiment Six is ​​shown. For the sake of brevity, descriptions similar to those in Embodiment Five are omitted. In this embodiment, the second spacer element has a certain thickness rather than being a thin sheet-like spacer element, so that the shapes of the second and third lenses meet the processing requirements while compensating for the axial spacing, ensuring the stability of the bearing.

[0130] Example 7

[0131] like Figures 20 to 24 The image shows an optical imaging lens according to Embodiment Seven of this application. Figure 20 A schematic diagram of the optical imaging lens of Embodiment 7 is shown.

[0132] like Figure 20As shown, the optical imaging lens includes, from the object side to the image side, the following components in sequence: lens barrel P0, first lens E1, first spacer element P1, second lens E2, second spacer element P2, third lens E3, third spacer element P3, fourth lens E4, and fourth spacer element P4.

[0133] The first lens E1 has positive optical power, its object-side surface S1 is concave, and its image-side surface S2 is convex. The second lens E2 has positive optical power, its object-side surface S3 is convex, and its image-side surface S4 is concave. The third lens E3 has positive optical power, its object-side surface S5 is convex, and its image-side surface S6 is convex. The fourth lens E4 has negative optical power, its object-side surface S7 is convex, and its image-side surface S8 is concave. The filter has an object-side surface S9 and an image-side surface S10, and the protective glass has an object-side surface S11 and an image-side surface S12. Light from the object passes sequentially through surfaces S1 to S12 and is finally imaged onto the imaging surface S13.

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

[0135] Face number Surface type radius of curvature thickness Refractive index Abbe number Conic coefficient OBJ spherical endless endless STO spherical endless 0.8750 S1 aspherical -3.8338 0.9909 1.52 64.00 -0.7287 S2 aspherical -3.9868 0.3500 0.0838 S3 aspherical 3.0333 1.5684 1.66 20.40 -0.9843 S4 aspherical 2.4811 2.1965 -1.0294 S5 aspherical 9.0213 5.0356 1.52 64.00 0.4473 S6 aspherical -4.4953 0.1385 -0.9034 S7 aspherical 4.2723 1.5150 1.66 20.40 -0.5650 S8 aspherical 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 higher-order coefficients that can be used for each aspherical mirror in Embodiment 7, wherein each aspherical surface shape can be defined by formula (1) given in Embodiment 1 above. In this embodiment, the object-side and image-side surfaces of the first to fourth lenses are all aspherical.

[0138]

[0139] Table 9

[0140] Figure 21 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 7 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 22 The astigmatism curve of the optical imaging lens of Embodiment 7 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 23 The distortion curve of the optical imaging lens of Embodiment 7 is shown, which represents the distortion magnitude value corresponding to different field of view angles. Figure 24 The magnification chromatic aberration curve of the optical imaging lens of Embodiment 7 is shown, which represents the degree to which the focal points of light of different wavelengths do not completely coincide.

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

[0142] Example 8

[0143] like Figure 25 As shown, an optical imaging lens of Embodiment 8 of this application is described. The difference between this lens and Embodiment 7 is that the distances and thicknesses between the various spacer elements, lenses, lens barrels, etc., are different.

[0144] Figure 25 A schematic diagram of the optical imaging lens of Embodiment 8 is shown. For the sake of brevity, descriptions similar to those in Embodiment 7 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, Examples 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 in Examples 1 to 8, as well as the sagitta 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 shows some structural parameters of the optical imaging lenses of Examples 1 to 8, in mm.

[0152]

[0153]

[0154] Table 12

[0155] This application also provides an imaging device, wherein the electronic photosensitive element can be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device can be a stand-alone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

[0156] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0157] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0158] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0159] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

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: The lens group, from the object side to the image side of the optical imaging lens, includes a first lens to a fourth lens arranged at intervals in sequence; A group of spacers, the group of spacers including at least a first spacer located between the first lens and the second lens and in at least partial contact with the image side of the first lens, a second spacer located between the second lens and the third lens and in at least partial contact with the image side of the second lens, and a third spacer located between the third lens and the fourth lens and in at least partial contact with the image side of the third lens; The lens barrel, wherein the lens group and the spacer element group are housed within the lens barrel; Wherein, 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 condition: -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 the following condition: -6.58≤f4 / (CP3+CT4)≤-4.

35.

2. The optical imaging lens according to claim 1, characterized in that, 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 condition: 0.89≤CP1 / (CT1+CT2)≤1.

34.

3. The optical imaging lens according to claim 1, characterized in that, The axial distance EP01 between the object-side end face of the lens barrel and the object-side surface of the first spacer element, and the sagitta SAG11 of the object-side surface of the first lens satisfy the following condition: 3.20≤EP01 / |SAG11|≤3.

78.

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

49.

5. The optical imaging lens according to claim 1, characterized in that, The radius of curvature R4 of the image side of the second lens and the outer diameter D1m of the image side of the first spacer element satisfy the following condition: 3.89≤D1m / R4≤4.

29.

6. The optical imaging lens according to claim 1, characterized in that, The outer diameter D2m of the image side of the second spacer element and the radius of curvature R5 of the object side of the third lens satisfy the following condition: 1.14≤D2m / R5≤1.

53.

7. The optical imaging lens according to claim 1, characterized in that, The third lens is made of aspherical glass. The radius of curvature 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 condition: 1.19≤R5*N3 / d3s≤1.

48.

8. The optical imaging lens according to claim 1, characterized in that, The outer diameter D3m of the image side of the third spacer element, the outer diameter D3s of the object side of the third spacer element, the radius of curvature R6 of the image side of the third lens, and the radius of curvature R7 of the object side of the fourth lens satisfy the following condition: -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 condition: 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 end face of the lens barrel, the outer diameter D0s of the object side end face 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 condition: 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 face of the lens barrel, the inner diameter d0m of the image-side end face 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 condition: 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 optical power, and the fourth lens has negative optical 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, and the image-side surface of the first lens is convex. The object-side surface of the second lens is convex, and the image-side surface of the second lens is concave. The object-side surface of the third lens is convex, and 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