Optical imaging lens

Abstract

The utility model provides an optical imaging lens. The optical imaging lens comprises a lens barrel, a lens group and at least one spacer, the lens group and the spacer are arranged in the lens barrel, the lens group is composed of four lenses, and the four lenses are sequentially a first lens, a second lens, a third lens and a fourth lens from the object side to the image side; the at least one spacer includes a first spacer located between the first lens and the second lens and in contact with an image-side surface portion of the first lens; wherein the maximum axial thickness CP1 of the first spacer, the center thickness CT1 of the first lens on the optical axis, and the air interval T12 of the first lens and the second lens on the optical axis meet the condition that CP1 / (CT1 + T12) is larger than or equal to 2.02 and smaller than or equal to 2.75. According to the utility model, the problem of poor assembly stability caused by unreasonable lens size of a four-piece optical imaging lens 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] In today's rapidly developing autonomous driving technology, environmental perception modules, as one of its core technologies, play a crucial role. LiDAR, as one of the main solutions for environmental perception modules, boasts significant advantages and broad application prospects in autonomous driving due to its all-weather operation capability, insensitivity to ambient light, and high ranging accuracy. Compared to traditional VR lenses, the optical imaging lenses at the LiDAR receiver not only need to ensure image quality but also face increasingly stringent requirements for reliability, as they directly impact the system's safety and accuracy.

[0003] In existing four-element optical imaging lenses, some lenses are too thin or too thick, and the lens size is not reasonable. This results in poor stability of the lens assembly, which directly affects the performance of the optical imaging lens.

[0004] In other words, the existing four-element optical imaging lens has the problem of poor assembly stability due to unreasonable lens size. Utility Model Content

[0005] The main objective of this invention is to provide an optical imaging lens to solve the problem of poor assembly stability caused by unreasonable lens size in existing four-element optical imaging lenses.

[0006] To achieve the above objectives, according to one aspect of the present invention, an optical imaging lens is provided, comprising a lens barrel and a lens group disposed in the lens barrel and at least one spacer. The lens group consists of four lenses, which are arranged sequentially from the object side to the image side as a first lens, a second lens, a third lens, and a fourth lens. The at least one spacer includes a first spacer located between the first lens and the second lens and in contact with the image-side surface of the first lens. The maximum axial thickness CP1 of the first spacer, the center thickness CT1 of the first lens on the optical axis, and the air gap T12 between the first lens and the second lens on the optical axis satisfy the following condition: 2.02≤CP1 / (CT1+T12)≤2.75.

[0007] According to another aspect of the present invention, an optical imaging lens is provided, comprising a lens barrel and a lens group and at least one spacer disposed in the lens barrel. The lens group consists of four lenses, which are arranged sequentially from the object side to the image side as a first lens with optical power, a second lens with optical power, a third lens with positive optical power, and a fourth lens with positive optical power. The at least one spacer includes a first spacer located between the first lens and the second lens and in contact with the image side surface of the first lens. The radius of curvature R2 of the image side surface of the first lens and the inner diameter d1s of the object side surface of the first spacer satisfy the following condition: -2.06 ≤ d1s / R2 ≤ -1.66.

[0008] According to another aspect of the present invention, an optical imaging lens is provided, comprising a lens barrel and a lens group and at least one spacer disposed within the lens barrel. The lens group consists of four lenses, which are arranged sequentially from the object side to the image side as a first lens with optical power, a second lens with optical power, a third lens with positive optical power, and a fourth lens with positive optical power. The at least one spacer includes a first spacer located between the first lens and the second lens and in contact with the image-side surface of the first lens. The effective focal length f1 of the first lens, the inner diameter d1s of the object-side surface of the first spacer, and the maximum axial thickness CP1 of the first spacer satisfy the following condition: 4.29 mm. -1 ≤|f1 / d1s / CP1|≤10.47mm -1 .

[0009] Furthermore, the radius of curvature R2 of the image side of the first lens and the inner diameter d1s of the object side of the first spacer satisfy the following condition: -2.06≤d1s / R2≤-1.66.

[0010] Furthermore, the inner diameter d1m of the image side of the first spacer and the radius of curvature R3 of the object side of the second lens satisfy the following condition: 2.49≤d1m / R3≤2.97.

[0011] Furthermore, at least one spacer also includes a second spacer located between the second lens and the third lens and in contact with the image-side portion of the second lens. The central thickness CT3 of the third lens on the optical axis, the air gap T23 between the second lens and the third lens on the optical axis and the maximum axial thickness CP2 of the second spacer satisfy the following: 1.57≤CT3 / (T23+CP2)≤4.10.

[0012] Furthermore, at least one spacer also includes a second spacer located between the second lens and the third lens and in contact with the image-side portion of the second lens. The axial spacing EP12 between the first spacer and the second spacer and the air spacing T23 between the second lens and the third lens on the optical axis satisfy the following: 0.61≤T23 / EP12≤1.32.

[0013] Furthermore, at least one spacer also includes a second spacer located between the second lens and the third lens and in contact with the image-side surface of the second lens. The radius of curvature R4 of the image-side surface of the second lens, the outer diameter D2s of the object-side surface of the second spacer, and the inner diameter d2s of the object-side surface of the second spacer satisfy the following: 0.70≤R4 / (D2s-d2s)≤0.92.

[0014] Furthermore, at least one spacer also includes a second spacer located between the second lens and the third lens and in contact with the image-side portion of the second lens, and a third spacer located between the third lens and the fourth lens and in contact with the image-side portion of the third lens. The axial spacing EP23 between the second spacer and the third spacer satisfies the following relationship with the center thickness CT3 of the third lens on the optical axis: 1.97≤CT3 / EP23≤2.72.

[0015] Furthermore, at least one spacer also includes a third spacer located between the third lens and the fourth lens and in contact with the image-side surface of the third lens, wherein 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 satisfy the following: 1.22≤R5×N3 / d3s≤1.57.

[0016] Furthermore, the radius of curvature R5 of the object side of the third lens and the radius of curvature R6 of the image side of the third lens satisfy the following condition: -1.64≤R5 / R6≤-1.05.

[0017] Furthermore, at least one spacer also includes a second spacer located between the second lens and the third lens and in contact with the image-side portion of the second lens, and a third spacer located between the third lens and the fourth lens and in contact with the image-side portion of the third lens. The outer diameter D2m of the image-side of the second spacer, the inner diameter d2m of the image-side of the second spacer, the inner diameter d3s of the object-side of the third spacer, and the outer diameter D3s of the object-side of the third spacer satisfy the following: 0.88≤(D2m-d2m) / (D3s-d3s)≤1.71.

[0018] Furthermore, at least one spacer also includes a second spacer located between the second lens and the third lens and in contact with the image-side surface of the second lens. The axial distance EP12 between the first spacer and the second spacer and the axial distance SAG21 between the intersection of the object-side surface of the second lens and the optical axis and the effective radius vertex of the object-side surface of the second lens satisfy the following: 1.01≤SAG21 / EP12≤1.49.

[0019] Furthermore, the central thickness CT3 of the third lens on the optical axis satisfies the following relationship with the maximum axial height L of the lens barrel: 3.23≤L / CT3≤3.71.

[0020] 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 ImgH on the imaging surface satisfy the following condition: 1.15≤(d0m-d0s) / ImgH≤1.34.

[0021] Furthermore, the third lens has positive optical power, and the fourth lens has positive optical power; 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 convex.

[0022] According to the technical solution of this utility model, the optical imaging lens includes a lens barrel and a lens group and at least one spacer disposed in the lens barrel. The lens group consists of four lenses, which are arranged in order from the object side to the image side as a first lens, a second lens, a third lens and a fourth lens. The at least one spacer includes a first spacer located between the first lens and the second lens and in contact with the image side surface of the first lens. The maximum axial thickness CP1 of the first spacer, the center thickness CT1 of the first lens on the optical axis and the air gap T12 between the first lens and the second lens on the optical axis satisfy the following: 2.02≤CP1 / (CT1+T12)≤2.75.

[0023] The optical imaging lens of this application consists of a lens barrel, four lenses disposed within the lens barrel, and at least one spacer. CP1 can be considered as the sum of the image-side elevation of the first lens, the air gap between the first and second lenses, and the object-side elevation of the second lens. Since the optical imaging lens of this application is composed of four lenses, changes in the first two lenses will cause changes in the effective diameter edges of the latter two lenses. When the value of CP1 / (CT1+T12) is too large or too small, the edge thickness of the third lens will be too thick, and the edge thickness of the fourth lens will be too thin, which is detrimental to lens formation and thus affects assembly stability. Therefore, this application, by reasonably arranging the four lenses and the position of the first spacer and controlling CP1 / (CT1+T12) within a reasonable range, can maintain the image-side elevation of the first lens, the object-side elevation of the second lens, the air gap between the first and second lenses, and the center thickness of the first lens on the optical axis within a reasonable range, thereby optimizing the dimensions of the front-end structure, reducing system sensitivity, and increasing assembly stability. Attached Figure Description

[0024] 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:

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

[0026] Figure 2 A schematic diagram of the structure of the optical imaging lens of Embodiment 1-1 of this utility model is shown;

[0027] Figure 3 A schematic diagram of the structure of the optical imaging lens of Embodiments 1-2 of this utility model is shown;

[0028] Figures 4 to 7 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.

[0029] Figure 8 A schematic diagram of the structure of the optical imaging lens of Embodiment 2-1 of this utility model is shown;

[0030] Figure 9 A schematic diagram of the structure of the optical imaging lens of Embodiment 2-2 of this utility model is shown;

[0031] Figures 10 to 13 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens of Embodiment 2 of this utility model are shown respectively.

[0032] Figure 14 A schematic diagram of the structure of the optical imaging lens of Embodiment 3-1 of this utility model is shown;

[0033] Figure 15 A schematic diagram of the structure of the optical imaging lens of Embodiment 3-2 of this utility model is shown;

[0034] Figures 16 to 19 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.

[0035] Figure 20 A schematic diagram of the structure of the optical imaging lens of Embodiment 4-1 of this utility model is shown;

[0036] Figure 21 A schematic diagram of the structure of the optical imaging lens of Embodiment 4-2 of this utility model is shown;

[0037] Figures 22 to 25 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens of Embodiment 4 of this utility model are shown respectively.

[0038] Figure 26 and Figure 27The MTF defocus curve and tolerance analysis diagram of an optical imaging lens according to an optional embodiment of the present invention are shown respectively when CP1 / (CT1+T12)=2.11.

[0039] Figure 28 and Figure 29 The MTF defocus curve and tolerance analysis diagram of an optical imaging lens according to an optional embodiment of the present invention are shown respectively when CP1 / (CT1+T12)=2.90;

[0040] Figure 30 and Figure 31 The MTF defocus curve and tolerance analysis diagram of an optical imaging lens according to an optional embodiment of the present invention are shown respectively when CP1 / (CT1+T12)=1.88;

[0041] Figure 32 and Figure 33 The stray light path diagram and stray light energy diagram of an optional embodiment of the optical imaging lens of this utility model are shown respectively when d1s / R2=-1.86;

[0042] Figure 34 and Figure 35 The stray light path diagram and stray light energy diagram of an optional embodiment of the optical imaging lens of this utility model are shown respectively when d1s / R2 = -3.2 or d1s / R2 = -0.8.

[0043] The above figures include the following reference numerals:

[0044] P0, Lens tube; E1, First lens; S1, Object-side surface of the first lens; S2, Image-side surface of the first lens; E2, Second lens; S3, Object-side surface of the second lens; S4, Image-side surface of the second lens; E3, Third lens; S5, Object-side surface of the third lens; S6, Image-side surface of the third lens; E4, Fourth lens; S7, Object-side surface of the fourth lens; S8, Image-side surface of the fourth lens; P1, First spacer; P2, Second spacer; P3, Third spacer; P4, Fourth spacer. Detailed Implementation

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] In this paper, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the 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 the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface shape in the paraxial region can be determined according to the judgment method commonly known in the art, 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 concavity or convexity. For the object side, 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 image side, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex. In this application, the left side is the object side, and the right side is the image side.

[0051] To address the problem of poor assembly stability caused by unreasonable lens sizes in existing four-element optical imaging lenses, this invention provides an optical imaging lens.

[0052] like Figures 1 to 35As shown, in an optional embodiment of this application, the optical imaging lens includes a lens barrel and a lens group and at least one spacer disposed in the lens barrel. The lens group consists of four lenses, which are arranged sequentially from the object side to the image side as a first lens, a second lens, a third lens, and a fourth lens. The at least one spacer includes a first spacer located between the first lens and the second lens and in contact with the image side portion of the first lens. The maximum axial thickness CP1 of the first spacer, the center thickness CT1 of the first lens on the optical axis, and the air gap T12 between the first lens and the second lens on the optical axis satisfy the following: 2.02≤CP1 / (CT1+T12)≤2.75.

[0053] The optical imaging lens of this application consists of a lens barrel, four lenses disposed within the lens barrel, and at least one spacer. CP1 can be considered as the sum of the image-side elevation of the first lens, the air gap between the first and second lenses, and the object-side elevation of the second lens. Since the optical imaging lens of this application is composed of four lenses, changes in the first two lenses will cause changes in the effective diameter edges of the latter two lenses. When the value of CP1 / (CT1+T12) is too large or too small, the edge thickness of the third lens will be too thick, and the edge thickness of the fourth lens will be too thin, which is detrimental to lens formation and thus affects assembly stability. Therefore, this application, by reasonably arranging the four lenses and the position of the first spacer and controlling CP1 / (CT1+T12) within a reasonable range, can maintain the image-side elevation of the first lens, the object-side elevation of the second lens, the air gap between the first and second lenses, and the center thickness of the first lens on the optical axis within a reasonable range, thereby optimizing the dimensions of the front-end structure, reducing system sensitivity, and increasing assembly stability.

[0054] In addition, please refer to Table 1 below and Figures 26 to 31 As shown. Figure 26 and Figure 27 The MTF defocus curve and tolerance analysis diagram are shown respectively when the optical imaging lens satisfies CP1 / (CT1+T12)=2.11. Figure 28 and Figure 19 The MTF defocus curve and tolerance analysis diagram are shown respectively when the optical imaging lens satisfies CP1 / (CT1+T12)=2.90. Figure 30 and Figure 31 The MTF defocus curve and tolerance analysis diagram are shown respectively when the optical imaging lens satisfies CP1 / (CT1+T12)=1.88. In the MTF defocus curve, the horizontal axis represents the defocus position, and the vertical axis represents the modulation transfer function (MTF). The smaller the defocus amount, the higher the MTF, and the clearer the image quality. In the tolerance analysis diagram, the horizontal axis represents MTF, and the vertical axis represents the simulated cumulative ratio. The higher the cumulative ratio, the higher the yield.

[0055] Depend on Figures 26 to 31 It can be seen that when CP1 / (CT1+T12) = 2.11, the MTF defocus curve is relatively concentrated, with high peak values, good image quality, and good tolerance analysis performance, but low sensitivity. When CP1 / (CT1+T12) = 2.90, the MTF defocus curve is relatively dispersed, some peak values ​​drop, field curvature increases, performance is poor, tolerance analysis performance is poor, and sensitivity is high. When CP1 / (CT1+T12) = 1.88, the MTF defocus curve is relatively dispersed, some peak values ​​drop, field curvature increases, performance is poor, tolerance analysis performance is poor, and sensitivity is high. Therefore, it is evident that when CP1 / (CT1+T12) is within the range of 2.02 to 2.75, the MTF defocus curve and tolerance analysis chart exhibit the best performance. Therefore, by constraining 2.02≤CP1 / (CT1+T12)≤2.75, this application can keep the image-side height of the first lens, the object-side height of the second lens, the air gap between the first and second lenses, and the center thickness of the first lens on the optical axis within a reasonable range, thereby optimizing the size of the front-end structure, reducing field curvature, improving image quality, and at the same time reducing system sensitivity and increasing assembly stability.

[0056] Table 1

[0057] Example 1 Example 2 Example 3 Conditional expression CP1 / (CT1+T12)=2.11 CP1 / (CT1+T12)=2.90 CP1 / (CT1+T12)=1.88 MTF defocus curve Figure 26 Figure 28 Figure 30 Tolerance Analysis Chart Figure 27 Figure 29 Figure 31

[0058] In addition, at least one spacer also includes a second spacer located between the second lens and the third lens and in contact with the image-side portion of the second lens, a third spacer located between the third lens and the fourth lens and in contact with the image-side portion of the third lens, and a fourth spacer located on the image side of the fourth lens and abutting against the image-side portion of the fourth lens.

[0059] It should be noted that each lens consists of a central optical effective part and an edge structural part. The edge structural part is located on the outer periphery of the central optical effective part and is arranged circumferentially around the central optical effective part. The central optical effective part is used for the passage of imaging light, while the edge structural part is not used for the passage of imaging light, but is used to abut against the lens barrel, adjacent lenses, or adjacent spacers.

[0060] In this embodiment, the radius of curvature R2 of the image-side surface of the first lens and the inner diameter d1s of the object-side surface of the first spacer satisfy the condition: -2.06 ≤ d1s / R2 ≤ -1.66. By controlling this condition, the shape of the first spacer and the stray light reduction effect can be controlled. By controlling the inner diameter of the object-side surface of the first spacer and the radius of curvature of the image-side surface of the first lens, stray light passing through the first lens can be blocked by the first spacer, which can effectively improve stray light and thus improve the imaging quality of the optical imaging lens.

[0061] In addition, such as Figures 32 to 35 As shown, Figure 32 and Figure 33 The stray light path diagram and stray light energy diagram are shown respectively when d1s / R2=-1.86. It can be seen from the stray light path diagram that when the scope of this application is met, the stray light can be effectively blocked by the first spacer, thereby reducing the stray light entering the rear system and effectively reducing the stray light energy. It can be seen from the stray light energy diagram that the stray light energy is relatively weak. Figure 34 and Figure 35 The stray light path diagram and stray light energy diagram are shown when the value of d1s / R2 is outside the range of this application, for example, d1s / R2 = -3.2 or d1s / R2 = -0.8. The stray light path diagram shows that the stray light is not blocked by the first spacer and enters the rear system. The stray light energy diagram shows that the stray light energy is relatively severe. Therefore, it can be seen that the stray light improvement effect of the optical imaging lens is best when d1s / R2 is in the range of -2.06 to -1.66.

[0062] In this embodiment, the inner diameter d1m of the image-side surface of the first spacer and the radius of curvature R3 of the object-side surface of the second lens satisfy the following condition: 2.49 ≤ d1m / R3 ≤ 2.97. By controlling this formula within a reasonable range, the shape of the first spacer and the stray light improvement effect can be controlled. By improving the inner diameter of the image-side surface of the first spacer and the shape of the first spacer, the stray light reflection path on the first spacer is changed, causing the stray light to undergo multiple reflections, which helps to reduce the energy and shape of the stray light, thereby achieving the purpose of improving stray light.

[0063] In this embodiment, the central thickness CT3 of the third lens on the optical axis, the air gap T23 between the second and third lenses on the optical axis, and the maximum axial thickness CP2 of the second spacer satisfy the following condition: 1.57 ≤ CT3 / (T23+CP2) ≤ 4.10. By controlling this formula within a reasonable range, not only can the positions of the second and third lenses be effectively limited, improving the structural compactness of the optical imaging lens, but it also helps to correct off-axis aberrations and improve the overall image quality of the optical imaging lens.

[0064] In this embodiment, the axial spacing EP12 between the first and second spacers and the air gap T23 between the second and third lenses on the optical axis satisfy the following condition: 0.61 ≤ T23 / EP12 ≤ 1.32. By controlling T23 / EP12 within a reasonable range, the edge thickness of the second lens and the size of the air gap between the second and third lenses can be made reasonable. At the same time, the ratio of the edge thickness of the second lens to its center thickness on the optical axis can be kept within a reasonable range, preventing an excessively large thickness ratio.

[0065] In this embodiment, the radius of curvature R4 of the image-side surface of the second lens, the outer diameter D2s of the object-side surface of the second spacer, and the inner diameter d2s of the object-side surface of the second spacer satisfy the following ratio: 0.70 ≤ R4 / (D2s-d2s) ≤ 0.92. By controlling D2s-d2s within a reasonable range, the contact length between the second spacer and the image-side surface of the second lens is optimized. When the ratio is within a reasonable range, controlling the value of this formula not only blocks stray light emitted from the edge structure of the second lens but also effectively improves the stray light emitted from the effective diameter portion of the second lens to the second spacer, thereby improving the image quality of the lens.

[0066] In this embodiment, the axial spacing EP23 between the second and third spacers and the center thickness CT3 of the third lens on the optical axis satisfy the following condition: 1.97 ≤ CT3 / EP23 ≤ 2.72. By controlling this formula within a reasonable range, the thickness ratio of the third lens can be kept within a reasonable range. Since the third lens is a glass lens, if the ratio is too large, the lens stress will concentrate at the edge of the effective diameter; if the ratio is too small, the edge thickness of the lens will be too large, affecting the molding of the lens and thus increasing the difficulty of lens molding.

[0067] In this embodiment, 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 satisfy the following condition: 1.22 ≤ R5 × N3 / d3s ≤ 1.57. By controlling this formula within a reasonable range, it can be ensured that non-imaging light rays passing through the third lens can be blocked by the third spacer, improving stray light conditions in the optical imaging lens and enhancing image quality.

[0068] In this embodiment, the radius of curvature R5 of the object-side surface of the third lens and the radius of curvature R6 of the image-side surface of the third lens satisfy the following condition: -1.64 ≤ R5 / R6 ≤ -1.05. By controlling this formula within a reasonable range, the radius of curvature of the object-side surface and the radius of curvature of the image-side surface of the third lens can be effectively controlled within a reasonable range. At the same time, the ratio of the edge thickness of the third lens to its center thickness on the optical axis can be effectively controlled within a reasonable range. This ensures the stability of the third lens formation while keeping the edge radius of curvature of the fourth lens small or negative, avoiding the situation where the edge thickness of the fourth lens is too thin.

[0069] In this embodiment, the outer diameter D2m of the image-side surface of the second spacer, the inner diameter d2m of the image-side surface of the second spacer, the inner diameter d3s of the object-side surface of the third spacer, and the outer diameter D3s of the object-side surface of the third spacer satisfy the following: 0.88≤(D2m-d2m) / (D3s-d3s)≤1.71. By controlling this formula within a reasonable range, the contact length between the third lens and the second spacer, and between the third spacer, can be ensured to be within a reasonable range. Simultaneously, the length of the edge structure portion of the third lens is ensured to be reasonable, avoiding situations where the edge structure portion of the third lens is too short or too long, thus preventing any impact on the assembly stability of the optical imaging lens.

[0070] In this embodiment, the axial distance EP12 between the first spacer and the second spacer, and the axial distance SAG21 between the intersection of the object-side surface of the second lens and the optical axis and the vertex of the effective radius of the object-side surface of the second lens, satisfy the following condition: 1.01 ≤ SAG21 / EP12 ≤ 1.49. Controlling this formula within a reasonable range ensures that the edge thickness and sag of the second lens are maintained at an appropriate size, avoiding excessive sag of the second lens, which could lead to surface shape problems during lens forming. Conversely, if the sag of the second lens is too small, the refractive power of the lens will be insufficient, easily causing the overall optical system to become longer, resulting in an excessively large total optical length.

[0071] In this embodiment, the central thickness CT3 of the third lens on the optical axis satisfies the following relationship with the maximum axial height L of the lens barrel: 3.23 ≤ L / CT3 ≤ 3.71. This setting helps to control the ratio of the thickness of the third lens to the maximum axial height of the lens barrel. Moreover, the larger the interval between the third and fourth lenses, the easier it is to select and match the third spacer, and the greater the space for improving stray light. This allows for better control over the matching method between the third and fourth lenses, which is more conducive to improving the overall stray light quality of the optical imaging lens.

[0072] 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 half the diagonal length of the effective pixel area on the imaging surface, ImgH, satisfy the following condition: 1.15 ≤ (d0m - d0s) / ImgH ≤ 1.34. Controlling this condition helps to control the length of the edge structure portion of the lens. When this ratio is too small, the step difference between the lens segments is too small, resulting in the edge structure portions of the first and second lenses being too long or the edge structure portions of the third and fourth lenses being too short. The former makes it difficult to form the first lens, and the latter makes the components less stable during the assembly of the optical imaging lens. When the ratio is too large, the step difference between the lens segments is too large, resulting in insufficient strength of the spacer, requiring the replacement with a stronger material, increasing the cost of the lens. Considering all factors, this range is limited. It should be noted that ImgH is half the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens.

[0073] In this embodiment, the third lens has positive optical power, and the fourth lens has positive optical power; 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 convex. By reasonably constraining the optical power and surface shape of each lens, it is beneficial to reasonably constrain the light path, ensure a smooth light transition, correct aberrations, and ensure image quality. It also helps ensure that the optical imaging lens is suitable for the near-infrared band. Specifically, the optical imaging lens of this application is mainly suitable for the near-infrared band, with a wavelength range greater than or equal to 700 nm and less than or equal to 2500 nm or 3000 nm.

[0074] Optionally, the optical imaging lens in the embodiments of this application can be simulated using software and / or tools such as ZEMAX and CODEV. During the simulation process using such software and / or tools, the surface profile of each lens can be appropriately adjusted according to the surface profile simulation provided by the software and / or tools used.

[0075] In addition, such as Figures 1 to 35 As shown, in another optional embodiment of this application, an optical imaging lens is also provided, including a lens barrel and a lens group and at least one spacer disposed in the lens barrel. The lens group consists of four lenses, which are arranged sequentially from the object side to the image side as a first lens with optical power, a second lens with optical power, a third lens with positive optical power, and a fourth lens with positive optical power. The at least one spacer includes a first spacer located between the first lens and the second lens and in contact with the image side surface of the first lens. The radius of curvature R2 of the image side surface of the first lens and the inner diameter d1s of the object side surface of the first spacer satisfy the following: -2.06≤d1s / R2≤-1.66.

[0076] The optical imaging lens of this application consists of a lens barrel, four lenses disposed in the lens barrel, and at least one spacer. By reasonably arranging the optical power of the four lenses and the position of the first spacer, and controlling -2.06≤d1s / R2≤-1.66, this application can control the shape of the first spacer and the stray light improvement effect. By controlling the inner diameter of the object side of the first spacer and the radius of curvature of the image side of the first lens, stray light passing through the first lens can be blocked by the first spacer, which can effectively improve stray light and thus improve the imaging quality of the optical imaging lens.

[0077] In addition, such as Figures 1 to 35As shown, in another optional embodiment of this application, an optical imaging lens is also provided, including a lens barrel and a lens group and at least one spacer disposed in the lens barrel. The lens group consists of four lenses, which are arranged sequentially from the object side to the image side as a first lens with optical power, a second lens with optical power, a third lens with positive optical power, and a fourth lens with positive optical power. The at least one spacer includes a first spacer located between the first lens and the second lens and in contact with the image side surface of the first lens. The effective focal length f1 of the first lens, the inner diameter d1s of the object side surface of the first spacer, and the maximum axial thickness CP1 of the first spacer satisfy the following: 4.29 mm. -1 ≤|f1 / d1s / CP1|≤10.47mm -1 .

[0078] The optical imaging lens of this application consists of a lens barrel, four lenses disposed within the lens barrel, and at least one spacer. This application achieves this by rationally arranging the optical power of the four lenses, the position of the first spacer, and controlling the focal length to 4.29mm. -1 ≤|f1 / d1s / CP1|≤10.47mm -1 This helps to control the shape of the first lens and the first spacer, and helps to ensure that the first spacer can effectively intercept stray light emitted from the first lens, improve stray light reduction effect, and ensure imaging quality.

[0079] Of course, this embodiment may also include other parametric expressions as described in the above embodiments, which will not be elaborated here.

[0080] Optionally, the aforementioned optical imaging lens may also include protective glass for protecting the photosensitive element located on the imaging surface.

[0081] 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.

[0082] 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.

[0083] Figure 1 A schematic diagram showing the dimensions of an optical imaging lens according to this application is provided. Figure 1 The parameters D2m, D2s, d0s, d1m, d2m, d2s, d1s, d3s, D3s, d0m, CP1, CP2, SAG21, EP12, EP23, and L are clearly and intuitively illustrated to provide a clear 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.

[0084] 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.

[0085] It should be noted that in the following Embodiment 1, there are two examples: Embodiment 1-1 and Embodiment 1-2; in Embodiment 2, there are two examples: Embodiment 2-1 and Embodiment 2-2; in Embodiment 3, there are two examples: Embodiment 3-1 and Embodiment 3-2; and in Embodiment 4, there are two examples: Embodiment 4-1 and Embodiment 4-2. In the two examples within the same embodiment, the radii of curvature, center thickness, and other parameters of the optical imaging lens from the first to the fourth lens, as well as the spacing distance between the lenses and the higher-order coefficients, are the same. However, the thickness, inner diameter, and outer diameter of the lens barrel, the first spacer, and the fourth spacer are different. In other words, the main structure used for imaging is the same, but the auxiliary structures used for imaging are different.

[0086] It should be noted that any one of the examples in Embodiments 1 to 4 described below is applicable to all embodiments of this application.

[0087] Example 1

[0088] like Figures 2 to 7 As shown, the optical imaging lens of Embodiment 1 is described. Figure 2 A schematic diagram of the optical imaging lens of Embodiment 1-1 is shown. Figure 3 A schematic diagram of the optical imaging lens of Embodiments 1-2 is shown.

[0089] like Figure 2 and Figure 3 As shown, the optical imaging lens includes a lens barrel P0 and a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, and a fourth spacer P4 arranged sequentially from the object side to the image side in the lens barrel P0.

[0090] like Figure 2The diagram shows a schematic representation of the optical imaging lens in Embodiment 1-1. In this example, the object-side and image-side surfaces of the first spacer P1 abut against the image-side surface S2 of the first lens and the object-side surface S3 of the second lens, respectively. The object-side and image-side surfaces of the second spacer P2 abut against the image-side surface S4 of the second lens and the object-side surface S5 of the third lens, respectively. The object-side and image-side surfaces of the third spacer P3 abut against the image-side surface S6 of the third lens and the object-side surface S7 of the fourth lens, respectively. The object-side surface of the fourth spacer P4 abuts against the image-side surface S8 of the fourth lens.

[0091] like Figure 3 The diagram shown is a structural schematic of the optical imaging lens of Embodiment 1-2. In this example, the bearing and contact method of each spacer is the same as that of Embodiment 1-1, and can be referred to the relevant description in Embodiment 1-1, which will not be repeated here.

[0092] In summary, the structural parameters of the optical imaging lens of Embodiment 1 under Embodiments 1-1 and 1-2 are shown in Table 2.

[0093] (Unit: mm)

[0094] Table 2

[0095]

[0096]

[0097] In Embodiment 1, the object-side surface S1 of the first lens is concave, and the image-side surface S2 of the first lens is convex. The object-side surface S3 of the second lens is convex, and the image-side surface S4 of the second lens is concave. The object-side surface S5 of the third lens is convex, and the image-side surface S6 of the third lens is convex. The object-side surface S7 of the fourth lens is convex, and the image-side surface S8 of the fourth lens is concave.

[0098] In Embodiment 1, the effective focal length f1 of the first lens is 92.82 mm, the effective focal length f2 of the second lens is -81.61 mm, the effective focal length f3 of the third lens is 8.47 mm, and the effective focal length f4 of the fourth lens is 31.35 mm.

[0099] Table 3 shows the basic structural parameters of the optical imaging lens in Embodiment 1, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0100] Table 3

[0101]

[0102] In Embodiment 1, the object-side surface and image-side surface of the first lens E1 to the fourth lens E4 are both aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0103]

[0104] Where x is the distance vector from the vertex of the aspherical surface at a height 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 1 above; k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 4 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.

[0105] Table 4

[0106]

[0107] Figure 4 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 5 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 6 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 7 The magnification chromatic aberration curve of the optical imaging lens of Embodiment 1 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical imaging lens.

[0108] according to Figures 4 to 7 As can be seen, the optical imaging lens given in Example 1 can achieve good imaging quality.

[0109] Example 2

[0110] like Figures 8 to 13 As shown, the optical imaging lens of Embodiment 2 is described. Figure 8 A schematic diagram of the optical imaging lens of Embodiment 2-1 is shown. Figure 9 A schematic diagram of the optical imaging lens of Embodiment 2-2 is shown.

[0111] like Figure 8 and Figure 9 As shown, the optical imaging lens includes a lens barrel P0 and a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, and a fourth spacer P4 arranged sequentially from the object side to the image side in the lens barrel P0.

[0112] like Figure 8The diagram shows a schematic of the optical imaging lens in Embodiment 2-1. In this example, the object-side and image-side surfaces of the first spacer P1 abut against the image-side surface S2 of the first lens and the object-side surface S3 of the second lens, respectively. The object-side and image-side surfaces of the second spacer P2 abut against the image-side surface S4 of the second lens and the object-side surface S5 of the third lens, respectively. The object-side and image-side surfaces of the third spacer P3 abut against the image-side surface S6 of the third lens and the object-side surface S7 of the fourth lens, respectively. The object-side surface of the fourth spacer P4 abuts against the image-side surface S8 of the fourth lens.

[0113] like Figure 9 The diagram shown is a structural schematic of the optical imaging lens of Embodiment 2-2. In this example, the bearing and contact method of each spacer is the same as that of Embodiment 2-1, and can be referred to the relevant description in Embodiment 2-1, which will not be repeated here.

[0114] In summary, the structural parameters of the optical imaging lens in Embodiment 2 under Embodiments 2-1 and 2-2 are shown in Table 5.

[0115] (Unit: mm)

[0116] Table 5

[0117] Parameters / Examples 2-1 2-2 d1s(mm) 7.109 8.001 d1m(mm) 8.752 8.752 d2s(mm) 8.072 8.072 d2m(mm) 9.189 9.189 D2s(mm) 11.686 11.686 D2m(mm) 11.446 11.446 d3s(mm) 10.076 10.076 D3s(mm) 11.446 11.446 d0s(mm) 8.512 8.512 d0m(mm) 13.365 13.365 CP1(mm) 3.192 3.192 CP2(mm) 0.498 0.498 EP12(mm) 1.745 1.745 EP23(mm) 1.783 2.068 L(mm) 16.673 16.673

[0118] In Embodiment 2, the object-side surface S1 of the first lens is concave, and the image-side surface S2 of the first lens is convex. The object-side surface S3 of the second lens is convex, and the image-side surface S4 of the second lens is concave. The object-side surface S5 of the third lens is convex, and the image-side surface S6 of the third lens is convex. The object-side surface S7 of the fourth lens is convex, and the image-side surface S8 of the fourth lens is concave.

[0119] In Embodiment 2, the effective focal length f1 of the first lens is -151.59mm, the effective focal length f2 of the second lens is 88.18mm, the effective focal length f3 of the third lens is 8.70mm, and the effective focal length f4 of the fourth lens is 30.50mm.

[0120] Table 6 shows the basic structural parameters of the optical imaging lens in Embodiment 2, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0121] Table 6

[0122]

[0123] Table 7 below lists 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 2. The aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0124] Table 7

[0125]

[0126] Figure 10 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 2 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 11 The astigmatism curve of the optical imaging lens of Embodiment 2 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 12 The distortion curve of the optical imaging lens of Embodiment 2 is shown, which represents the distortion magnitude value corresponding to different field of view angles. Figure 13 The magnification chromatic aberration curve of the optical imaging lens of Embodiment 2 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical imaging lens.

[0127] according to Figures 10 to 13 It can be seen that the optical imaging lens given in Example 2 can achieve good imaging quality.

[0128] Example 3

[0129] like Figures 14 to 19 As shown, the optical imaging lens of Embodiment 3 is described. Figure 14 A schematic diagram of the optical imaging lens of Embodiment 3-1 is shown. Figure 15 A schematic diagram of the optical imaging lens of Embodiment 3-2 is shown.

[0130] like Figure 14 and Figure 15 As shown, the optical imaging lens includes a lens barrel P0 and a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, and a fourth spacer P4 arranged sequentially from the object side to the image side in the lens barrel P0.

[0131] like Figure 14The diagram shows a schematic of the optical imaging lens in Embodiment 3-1. In this example, the object-side and image-side of the first spacer P1 abut against the image-side S2 of the first lens and the object-side S3 of the second lens, respectively. The object-side and image-side of the second spacer P2 abut against the image-side S4 of the second lens and the object-side S5 of the third lens, respectively. The object-side and image-side of the third spacer P3 abut against the image-side S6 of the third lens and the object-side S7 of the fourth lens, respectively. The object-side of the fourth spacer P4 abuts against the image-side S8 of the fourth lens.

[0132] like Figure 15 The diagram shown is a structural schematic of the optical imaging lens of Embodiment 3-2. In this example, the bearing and contact method of each spacer is the same as that of Embodiment 3-1, and can be referred to the relevant description in Embodiment 3-1, which will not be repeated here.

[0133] In summary, the structural parameters of the optical imaging lens in Embodiment 3 under Embodiments 3-1 and 3-2 are shown in Table 8.

[0134] (Unit: mm)

[0135] Table 8

[0136] Parameters / Examples 3-1 3-2 d1s(mm) 7.247 7.649 d1m(mm) 8.809 8.809 d2s(mm) 7.749 7.749 d2m(mm) 9.063 9.064 D2s(mm) 11.234 11.234 D2m(mm) 11.707 11.707 d3s(mm) 9.623 9.623 D3s(mm) 11.503 11.503 d0s(mm) 8.417 8.420 d0m(mm) 13.354 13.354 CP1(mm) 3.393 3.393 CP2 (mm) 0.854 0.854 EP12(mm) 1.521 1.521 EP23(mm) 1.781 1.781 L(mm) 16.673 16.673

[0137] In Embodiment 3, the object-side surface S1 of the first lens is concave, and the image-side surface S2 of the first lens is convex. The object-side surface S3 of the second lens is convex, and the image-side surface S4 of the second lens is concave. The object-side surface S5 of the third lens is convex, and the image-side surface S6 of the third lens is convex. The object-side surface S7 of the fourth lens is convex, and the image-side surface S8 of the fourth lens is concave.

[0138] In Embodiment 3, the effective focal length f1 of the first lens is 257.56 mm, the effective focal length f2 of the second lens is 97.95 mm, the effective focal length f3 of the third lens is 8.21 mm, and the effective focal length f4 of the fourth lens is 80.85 mm.

[0139] Table 9 shows the basic structural parameters of the optical imaging lens in Embodiment 3, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0140] Table 9

[0141]

[0142] Table 10 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, and A28 that can be used for each aspherical mirror S1-S8 in Example 3. The surface shape of each aspherical surface can be defined by formula (1) given in Example 1 above.

[0143] Table 10

[0144]

[0145]

[0146] Figure 16 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 17 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 18 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 19 The magnification chromatic aberration curve of the optical imaging lens of Embodiment 3 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical imaging lens.

[0147] according to Figures 16 to 19 It can be seen that the optical imaging lens given in Example 3 can achieve good imaging quality.

[0148] Example 4

[0149] like Figures 20 to 25 As shown, the optical imaging lens of Embodiment 4 is described. Figure 20 A schematic diagram of the optical imaging lens of Embodiment 4-1 is shown. Figure 21 A schematic diagram of the optical imaging lens of Embodiment 4-2 is shown.

[0150] like Figure 20 and Figure 21 As shown, the optical imaging lens includes a lens barrel P0 and a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, and a fourth spacer P4 arranged sequentially from the object side to the image side in the lens barrel P0.

[0151] like Figure 20The diagram shows a schematic of the optical imaging lens in Embodiment 4-1. In this example, the object-side and image-side of the first spacer P1 abut against the image-side S2 of the first lens and the object-side S3 of the second lens, respectively. The object-side and image-side of the second spacer P2 abut against the image-side S4 of the second lens and the object-side S5 of the third lens, respectively. The object-side and image-side of the third spacer P3 abut against the image-side S6 of the third lens and the object-side S7 of the fourth lens, respectively. The object-side of the fourth spacer P4 abuts against the image-side S8 of the fourth lens.

[0152] like Figure 21 The diagram shown is a structural schematic of the optical imaging lens of Embodiment 4-2. In this example, the bearing and contact method of each spacer is the same as that of Embodiment 4-1, and can be referred to the relevant description in Embodiment 4-1, which will not be repeated here.

[0153] In summary, the structural parameters of the optical imaging lens of Embodiment 4 under Embodiments 4-1 and 4-2 are shown in Table 11.

[0154] (Unit: mm)

[0155] Table 11

[0156]

[0157]

[0158] In Embodiment 4, the object-side surface S1 of the first lens is concave, and the image-side surface S2 of the first lens is convex. The object-side surface S3 of the second lens is convex, and the image-side surface S4 of the second lens is concave. The object-side surface S5 of the third lens is convex, and the image-side surface S6 of the third lens is convex. The object-side surface S7 of the fourth lens is convex, and the image-side surface S8 of the fourth lens is concave.

[0159] In Embodiment 4, the effective focal length f1 of the first lens is 169.11 mm, the effective focal length f2 of the second lens is 133.37 mm, the effective focal length f3 of the third lens is 8.21 mm, and the effective focal length f4 of the fourth lens is 162.70 mm.

[0160] Table 12 shows the basic structural parameters of the optical imaging lens in Embodiment 4, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0161] Table 12

[0162]

[0163] Table 13 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, and A28 that can be used for each aspherical mirror S1-S8 in Example 4. The surface shape of each aspherical surface can be defined by formula (1) given in Example 1 above.

[0164] Table 13

[0165]

[0166] Figure 22 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 4 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 23 The astigmatism curve of the optical imaging lens of Embodiment 4 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 24 The distortion curve of the optical imaging lens of Embodiment 4 is shown, which represents the distortion magnitude value corresponding to different field of view angles. Figure 25 The magnification chromatic aberration curve of the optical imaging lens of Embodiment 4 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical imaging lens.

[0167] according to Figures 22 to 25 It can be seen that the optical imaging lens given in Example 4 can achieve good imaging quality.

[0168] In summary, Examples 1 to 4 satisfy the relationships shown in Table 14.

[0169] Table 14

[0170]

[0171]

[0172] Table 15 shows the effective focal length and other parameters of each lens of the optical imaging lens in Examples 1 to 4.

[0173] Table 15

[0174] Parameters / Examples one two three Four f1(mm) 92.82 -151.59 257.56 169.11 f2 (mm) -81.61 88.18 97.95 133.37 f3 (mm) 8.47 8.70 8.21 8.21 f4 (mm) 31.35 30.50 80.85 162.70 SAG21 (mm) 2.03 2.26 2.22 2.26 ImgH(mm) 3.87 3.87 3.87 3.87

[0175] 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.

[0176] 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.

[0177] 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.

[0178] 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.

[0179] 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, Includes a lens barrel, a lens assembly disposed within the lens barrel, and at least one spacer. The lens group consists of four lenses, which are arranged in the order of first lens, second lens, third lens and fourth lens from object side to image side; The at least one spacer includes a first spacer located between the first lens and the second lens and in contact with the image-side portion of the first lens; The maximum axial thickness CP1 of the first spacer, the center thickness CT1 of the first lens on the optical axis, and the air gap T12 between the first lens and the second lens on the optical axis satisfy the following condition: 2.02≤CP1 / (CT1+T12)≤2.

75.

2. The optical imaging lens according to claim 1, characterized in that, The radius of curvature R2 of the image side of the first lens and the inner diameter d1s of the object side of the first spacer satisfy the following condition: -2.06≤d1s / R2≤-1.

66.

3. The optical imaging lens according to claim 1, characterized in that, The inner diameter d1m of the image side of the first spacer and the radius of curvature R3 of the object side of the second lens satisfy the following condition: 2.49≤d1m / R3≤2.

97.

4. The optical imaging lens according to claim 1, characterized in that, The at least one spacer further includes a second spacer located between the second lens and the third lens and in contact with the image-side surface portion of the second lens. The central thickness CT3 of the third lens on the optical axis, the air gap T23 between the second lens and the third lens on the optical axis, and the maximum axial thickness CP2 of the second spacer satisfy the following condition: 1.57≤CT3 / (T23+CP2)≤4.

10.

5. The optical imaging lens according to claim 1, characterized in that, The at least one spacer further includes a second spacer located between the second lens and the third lens and in contact with the image-side surface portion of the second lens. The axial spacing EP12 between the first spacer and the second spacer satisfies the following condition with respect to the air spacing T23 between the second lens and the third lens on the optical axis: 0.61≤T23 / EP12≤1.

32.

6. The optical imaging lens according to claim 1, characterized in that, The at least one spacer further includes a second spacer located between the second lens and the third lens and in contact with the image-side surface portion of the second lens. The radius of curvature R4 of the image side of the second lens, the outer diameter D2s of the object side of the second spacer, and the inner diameter d2s of the object side of the second spacer satisfy the following condition: 0.70≤R4 / (D2s-d2s)≤0.

92.

7. The optical imaging lens according to claim 1, characterized in that, The at least one spacer further includes a second spacer located between the second lens and the third lens and in contact with the image-side surface of the second lens, and a third spacer located between the third lens and the fourth lens and in contact with the image-side surface of the third lens. The axial spacing EP23 between the second spacer and the third spacer satisfies the following relationship with the center thickness CT3 of the third lens on the optical axis: 1.97≤CT3 / EP23≤2.

72.

8. The optical imaging lens according to claim 1, characterized in that, The at least one spacer also includes a third spacer located between the third lens and the fourth lens and in contact with the image-side portion of the third lens. 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 satisfy the following condition: 1.22≤R5×N3 / d3s≤1.

57.

9. The optical imaging lens according to claim 1, characterized in that, The radius of curvature R5 of the object side of the third lens and the radius of curvature R6 of the image side of the third lens satisfy the following condition: -1.64≤R5 / R6≤-1.

05.

10. The optical imaging lens according to claim 1, characterized in that, The at least one spacer further includes a second spacer located between the second lens and the third lens and in contact with the image-side surface of the second lens, and a third spacer located between the third lens and the fourth lens and in contact with the image-side surface of the third lens. The outer diameter D2m of the image side of the second spacer, the inner diameter d2m of the image side of the second spacer, the inner diameter d3s of the object side of the third spacer, and the outer diameter D3s of the object side of the third spacer satisfy the following: 0.88≤(D2m-d2m) / (D3s-d3s)≤1.

71.

11. The optical imaging lens according to claim 1, characterized in that, The at least one spacer further includes a second spacer located between the second lens and the third lens and in contact with the image-side surface portion of the second lens. The axial distance EP12 between the first spacer and the second spacer and the axial distance SAG21 between the intersection of the object side surface and the optical axis of the second lens and the vertex of the effective radius of the object side surface of the second lens satisfy the following condition: 1.01≤SAG21 / EP12≤1.

49.

12. The optical imaging lens according to claim 1, characterized in that, The central thickness CT3 of the third lens on the optical axis and the maximum axial height L of the lens barrel satisfy the following condition: 3.23≤L / CT3≤3.

71.

13. The optical imaging lens according to claim 1, 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 satisfy the following condition: 1.15≤(d0m-d0s) / ImgH≤1.

34.

14. The optical imaging lens according to any one of claims 1 to 13, characterized in that, The third lens has positive optical power, and the fourth lens has positive optical power; The first lens has a concave object side and a convex image side; the second lens has a convex object side and a concave image side; the third lens has a convex object side and a convex image side; and the fourth lens has a convex object side and a convex image side.

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