Optical imaging lens

Abstract

The present invention provides an optical imaging lens. The optical imaging lens includes a lens barrel, a lens group, and a spacer element group disposed within the lens barrel. Among the adjacent two lenses in the lens group, the air gap between the third lens and the fourth lens on the optical axis is the largest; the spacer element group at least includes a second spacer element and a third spacer element. The inner diameter d3s of the object side surface of the third spacer element and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy: 5.45 < d3s / T34 < 8.10; the inner diameter d3s of the object side surface of the third spacer element, the inner diameter d2s of the object side surface of the second spacer element, and the effective focal length f3 of the third lens satisfy: -17.90 < f3 / (d2s - d3s) < -7.25. The present invention solves the problem in the prior art that the optical imaging lens has serious stray light due to the need to meet miniaturization requirements.

Description

Technical Field

[0001] This invention relates to the field of optical imaging equipment technology, and more specifically, to an optical imaging lens. Background Technology

[0002] With the development of mobile devices, especially the continuous development of camera technology in smartphones, users' demand for optical imaging quality is increasing, while also requiring mobile devices to become thinner and lighter. In order to meet the demand for thinner and lighter mobile devices, optical imaging lenses are gradually developing towards miniaturization.

[0003] However, the internal space of miniaturized optical imaging lenses is limited, and interference can easily occur during lens assembly. To reduce interference during lens assembly, the air gap between lenses at the rear end is usually designed to be larger. However, this increases the optical path length of light within the air gap, directly leading to an increase in stray light beyond the effective light source. The generation of stray light not only reduces image contrast but can also cause image quality degradation problems such as halos and color distortion. In high-precision imaging systems, even tiny stray lights can have a significant impact on the final image, especially in low-light environments where the interference effect of stray light is even more pronounced.

[0004] In other words, existing optical imaging lenses suffer from severe stray light issues due to the pursuit of miniaturization. Summary of the Invention

[0005] The main objective of this invention is to provide an optical imaging lens to solve the problem of severe stray light caused by miniaturization in existing optical imaging lenses.

[0006] To achieve the above object, according to one aspect of the present invention, there is provided an optical imaging lens, comprising a lens barrel, a lens group and a spacer element group disposed within the lens barrel. The lens group consists of four lenses, and the lens group includes a first lens with a negative optical power, a second lens with a positive optical power, a third lens with a negative optical power, and a fourth lens with a positive optical power, which are arranged in sequence along the optical axis direction from the object side to the image side. Among the air gaps between adjacent two lenses in the lens group along the optical axis, the air gap between the third lens and the fourth lens along the optical axis is the largest; the spacer element group at least includes a second spacer element and a third spacer element. The second spacer element is located between the second lens and the third lens and is in partial contact with the image side surface of the second lens, and the third spacer element is located between the third lens and the fourth lens and is in partial contact with the image side surface of the third lens; the inner diameter d3s of the object side surface of the third spacer element and the air gap T34 between the third lens and the fourth lens along the optical axis satisfy: 5.45 < d3s / T34 < 8.10; the inner diameter d3s of the object side surface of the third spacer element, the inner diameter d2s of the object side surface of the second spacer element, and the effective focal length f3 of the third lens satisfy: -17.90 < f3 / (d2s - d3s) < -7.25.

[0007] According to another aspect of the present invention, there is provided an optical imaging lens, comprising a lens barrel, a lens group and a spacer element group disposed within the lens barrel. The lens group consists of four lenses, and the lens group includes a first lens with a negative optical power, a second lens with a positive optical power, a third lens with a negative optical power, and a fourth lens with a positive optical power, which are arranged in sequence along the optical axis direction from the object side to the image side. Among the air gaps between adjacent two lenses in the lens group along the optical axis, the air gap between the third lens and the fourth lens along the optical axis is the largest; the spacer element group at least includes a second spacer element and a third spacer element. The second spacer element is located between the second lens and the third lens and is in partial contact with the image side surface of the second lens, and the third spacer element is located between the third lens and the fourth lens and is in partial contact with the image side surface of the third lens; the air gap T34 between the third lens and the fourth lens along the optical axis and the maximum thickness CP3 of the third spacer element in the optical axis direction satisfy: 16.20 < T34 / CP3 < 43.50; the inner diameter d3s of the object side surface of the third spacer element, the inner diameter d2s of the object side surface of the second spacer element, and the effective focal length f3 of the third lens satisfy: -17.90 < f3 / (d2s - d3s) < -7.25.

[0008] According to another aspect of the present invention, an optical imaging lens is provided, which includes a lens barrel, a lens group and a spacer element group disposed in the lens barrel. The lens group consists of four lenses, and the lens group includes a first lens with a negative optical power, a second lens with a positive optical power, a third lens with a negative optical power, and a fourth lens with a positive optical power, which are arranged in sequence along the optical axis from the object side to the image side; the spacer element group at least includes a second spacer element and a third spacer element. The second spacer element is located between the second lens and the third lens and is partially in contact with the image side surface of the second lens. The third spacer element is located between the third lens and the fourth lens and is partially in contact with the image side surface of the third lens. The inner diameter of the third spacer element in the spacer element group is the smallest; the inner diameter d0s of the object side end surface of the lens barrel and the inner diameter d3s of the object side surface of the third spacer element satisfy: 1.80 < d0s / d3s < 2.20; the curvature radius R3 of the object side surface of the second lens, the refractive index N2 of the second lens, the inner diameter d2s of the object side surface of the second spacer element, the curvature radius R5 of the object side surface of the third lens, the refractive index N3 of the third lens, and the inner diameter d3s of the object side surface of the third spacer element satisfy: 2.95 < R3×N2 / d2s + R5×N3 / d3s < 4.20.

[0009] Further, the air gap T34 between the third lens and the fourth lens on the optical axis and the maximum thickness CP3 of the third spacer element in the optical axis direction satisfy: 16.20 < T34 / CP3 < 43.50.

[0010] Further, the spacer distance EP23 between the image side surface of the second spacer element and the object side surface of the third spacer element in the optical axis direction and the central thickness CT3 of the third lens on the optical axis satisfy: 1.42 < EP23 / CT3 < 2.40.

[0011] Further, the inner diameter d3m of the image side surface of the third spacer element and the effective focal length f4 of the fourth lens satisfy: 4.55 < f4 / d3m < 8.60; the curvature radius R7 of the object side surface of the fourth lens and the inner diameter d3m of the image side surface of the third spacer element satisfy: 3.00 < R7 / d3m < 18.30.

[0012] Further, the outer diameter D2s of the object side surface of the second spacer element, the inner diameter d2s of the object side surface of the second spacer element, and the central thickness CT2 of the second lens on the optical axis satisfy: 1.10 < (D2s - d2s) / CT2 < 1.95.

[0013] Furthermore, the air gap T34 between the third and fourth lenses on the optical axis, and the air gap T23 between the second and third lenses on the optical axis, satisfy the following condition: 14.95 < T34 / T23 < 20.68; the distance EP23 between the image side of the second spacer element and the object side of the third spacer element on the optical axis, and the effective focal length f3 of the third lens satisfy the following condition: -10.40. <f3 / EP23<-6.85。

[0014] Furthermore, the inner diameter d2m of the image-side surface of the second spacer element and the center thickness CT3 of the third lens on the optical axis satisfy the following condition: 6.62 <d2m / CT3<10.55。

[0015] Furthermore, the maximum thickness CP3 of the third spacer element in the optical axis direction, and the axial distance SAG41 between the intersection of the object-side surface of the fourth lens and the optical axis and the vertex of the effective radius of the object-side surface of the fourth lens satisfy the following condition: 1.25 <SAG41 / CP3<5.92。

[0016] Furthermore, the inner diameter of the object-side surface of the second spacer element is larger than the inner diameter of the object-side surface of the third spacer element, and the central thickness CT3 of the third lens on the optical axis and the central thickness CT2 of the second lens on the optical axis satisfy the following relationship: 2.27 <CT2 / CT3<4.55。

[0017] Furthermore, the spacer element group also includes a first spacer element, which is located between the first lens and the second lens and contacts the image-side surface of the first lens. The effective focal length f1 of the first lens and the outer diameter D1s of the object-side surface of the first spacer element satisfy the following relationship: -21.25 <f1 / D1s<-19.40。

[0018] Furthermore, the spacer element group also includes a first spacer element, which is located between the first lens and the second lens and contacts the image-side surface of the first lens. The inner diameter of the object-side surface of the first spacer element is larger than the inner diameter of the object-side surface of the second spacer element. The distance EP12 between the image-side surface of the first spacer element and the object-side surface of the second spacer element in the optical axis direction, and the effective focal length f2 of the second lens, satisfy: 6.80. <f2 / EP12<11.91。

[0019] Furthermore, the spacer element group also includes a first spacer element, which is located between the first lens and the second lens and contacts the image-side surface of the first lens. The inner diameter d1m of the image-side surface of the first spacer element and the center thickness CT2 of the second lens on the optical axis satisfy the following condition: 2.56 <d1m / CT2<3.61。

[0020] Further, the spacer element group further includes a first spacer element, the first spacer element is located between the first lens and the second lens and contacts the image-side surface portion of the first lens, the outer diameters of the plurality of spacer elements in the spacer element group gradually decrease from the object side to the image side, and the inner diameter of the third spacer element in the spacer element group is the smallest.

[0021] Further, the inner diameter d0s of the object-side end surface of the lens barrel and the inner diameter d0m of the image-side end surface of the lens barrel satisfy: 1.39 < d0s / d0m < 2.03.

[0022] Further, the axial distance SAG32 between the intersection point of the image-side surface of the third lens and the optical axis and the vertex of the effective radius of the image-side surface of the third lens and the maximum thickness CP3 of the third spacer element in the optical axis direction satisfy: 16.35 < SAG32 / CP3 < 41.60.

[0023] Further, the optical imaging lens further includes a trapezoidal prism, the trapezoidal prism is located on the image side of the lens group and reflects the light rays emitted from the fourth lens back to the imaging surface.

[0024] Applying the technical solution of the present invention, the optical imaging lens includes a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens group is composed of four lenses. The lens group includes a first lens with a negative optical power, a second lens with a positive optical power, a third lens with a negative optical power, and a fourth lens with a positive optical power, which are arranged in sequence along the optical axis from the object side to the image side. The air gap on the optical axis between the third lens and the fourth lens in the air gaps between adjacent two lenses in the lens group is the largest; the spacer element group at least includes a second spacer element and a third spacer element. The second spacer element is located between the second lens and the third lens and contacts the image-side surface portion of the second lens. The third spacer element is located between the third lens and the fourth lens and contacts the image-side surface portion of the third lens; the inner diameter d3s of the object-side surface of the third spacer element and the air gap T34 on the optical axis between the third lens and the fourth lens satisfy: 5.45 < d3s / T34 < 8.10; the inner diameter d3s of the object-side surface of the third spacer element, the inner diameter d2s of the object-side surface of the second spacer element, and the effective focal length f3 of the third lens satisfy: -17.90 < f3 / (d2s - d3s) < -7.25.

[0025] The optical imaging lens of this application consists of a lens barrel, four lenses, and at least two spacer elements. When the air gap between the third and fourth lenses on the optical axis is the largest among the adjacent lenses in the lens group, large-angle light rays are easily deflected into the optical structure area of ​​the fourth lens when light is transmitted between the third and fourth lenses, thus forming stray light. This application can intercept stray light emitted from the second and third lenses by constraining d3s / T34 and f3 / (d2s-d3s) within a reasonable range. At the same time, it can constrain the degree of light deflection by the third lens and the air gap between the third and fourth lenses on the optical axis, so that the light is transmitted along a preset path, reducing the large-angle deflected light rays, thereby reducing the generation of stray light. Attached Figure Description

[0026] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0027] Figure 1 A dimensioned diagram of an optical imaging lens according to an alternative embodiment of the present invention is shown;

[0028] Figure 2 A partial structural schematic diagram of the optical imaging lens of Embodiment 1-1 of the present invention is shown;

[0029] Figure 3 A partial structural schematic diagram of the optical imaging lens of Embodiments 1-2 of the present invention is shown;

[0030] Figure 4 The diagram shows partial structural schematics of the optical imaging lenses of embodiments 1-3 of the present invention;

[0031] Figures 5 to 7 The astigmatism curve, distortion curve, and relative illumination curve of the optical imaging lens according to Embodiment 1 of the present invention are shown respectively.

[0032] Figure 8 A partial structural schematic diagram of the optical imaging lens of Embodiment 2-1 of the present invention is shown;

[0033] Figure 9 A partial structural schematic diagram of the optical imaging lens of Embodiment 2-2 of the present invention is shown;

[0034] Figure 10 A partial structural schematic diagram of the optical imaging lens of Embodiments 2-3 of the present invention is shown;

[0035] Figures 11 to 13 The astigmatism curve, distortion curve, and relative illumination curve of the optical imaging lens of Embodiment 2 of the present invention are shown respectively.

[0036] Figure 14 A partial structural schematic diagram of the optical imaging lens of Embodiment 3-1 of the present invention is shown;

[0037] Figure 15 A partial structural schematic diagram of the optical imaging lens of Embodiment 3-2 of the present invention is shown;

[0038] Figure 16 A partial structural schematic diagram of the optical imaging lens of Embodiment 3-3 of the present invention is shown;

[0039] Figures 17 to 19 The astigmatism curve, distortion curve, and relative illumination curve of the optical imaging lens of Embodiment 3 of the present invention are shown respectively.

[0040] Figure 20 A schematic diagram of the overall structure of an optical imaging lens according to an optional embodiment of the present invention is shown;

[0041] Figure 21 A stray light spot diagram of an optical imaging lens according to an optional embodiment of the present invention is shown;

[0042] Figure 22 A stray light pattern of an example optical imaging lens is shown;

[0043] Figure 23 Another example of stray light pattern from an optical imaging lens is shown.

[0044] The above figures include the following reference numerals:

[0045] E1, First lens; P1, First spacer element; E2, Second lens; P2, Second spacer element; E3, Third lens; P3, Third spacer element; E4, Fourth lens; 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; 10, Trapezoidal prism. Detailed Implementation

[0046] 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.

[0047] 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.

[0048] In this invention, 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 intended to limit this invention.

[0049] 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.

[0050] 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.

[0051] 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 determination of the surface shape in the paraxial region can be based on 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 convexity or concavity. 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, during the transmission of light, the front of the imaging ray is the object side, and the rear of the imaging ray is the image side. That is, of the two sides of the lens, the side that the imaging ray passes through first is the object side of the lens, and the side that the imaging ray passes through last is the image side of the lens.

[0052] To address the problem of severe stray light in existing optical imaging lenses due to miniaturization requirements, this invention provides an optical imaging lens.

[0053] like Figures 1 to 21As shown in the figure, the optical imaging lens includes a lens barrel, a lens group, and a spacer element group disposed within the lens barrel. The lens group consists of four lenses, including a first lens with a negative focal power arranged sequentially along the optical axis from the object side to the image side, a second lens with a positive focal power, a third lens with a negative focal power, and a fourth lens with a positive focal power. Among the air gaps between adjacent two lenses in the lens group along the optical axis, the air gap between the third lens and the fourth lens along the optical axis is the largest. The spacer element group at least includes a second spacer element and a third spacer element. The second spacer element is located between the second lens and the third lens and is in partial contact with the image side surface of the second lens. The third spacer element is located between the third lens and the fourth lens and is in partial contact with the image side surface of the third lens. The inner diameter d3s of the object side surface of the third spacer element and the air gap T34 between the third lens and the fourth lens along the optical axis satisfy: 5.45 < d3s / T34 < 8.10. The inner diameter d3s of the object side surface of the third spacer element, the inner diameter d2s of the object side surface of the second spacer element, and the effective focal length f3 of the third lens satisfy: -17.90 < f3 / (d2s - d3s) < -7.25.

[0054] The optical imaging lens of the present application consists of a lens barrel, four lenses, and at least two spacer elements. When the air gap between the third lens and the fourth lens along the optical axis is the largest among the air gaps between adjacent two lenses in the lens group, when light travels between the third lens and the fourth lens, large-angle light is likely to deflect into the optical structure area of the fourth lens and form stray light. In the present application, by constraining d3s / T34 and f3 / (d2s - d3s) within a reasonable range, the stray light emitted from the second lens and the third lens can be intercepted. At the same time, the deflection degree of the third lens on the light and the air gap between the third lens and the fourth lens along the optical axis are constrained, so that the light travels along a preset path, reducing the light with large-angle deflection, and thus reducing the generation of stray light.

[0055] In addition, refer to the following Figures 21 to 23 As shown in the figure, when the optical imaging lens satisfies that the air gap between the third lens and the fourth lens along the optical axis is the largest among the air gaps between adjacent two lenses in the lens group, Figure 21 The stray light spot diagram of the optical imaging lens of an optional embodiment of the present invention is shown. Specifically, in this embodiment, the optical imaging lens satisfies d3s / T34 = 7.59 and f3 / (d2s - d3s) = -11.47. Hereinafter, this embodiment is referred to as Embodiment 1. Figure 22 The stray light spot diagram of an exemplary optical imaging lens is shown. Specifically, in this example, the optical imaging lens satisfies d3s / T34 = 0.50 and f3 / (d2s - d3s) = -11.47. Specifically, hereinafter, this example is referred to as Example 1. Figure 23A stray light pattern of another example optical imaging lens is shown. Specifically, the optical imaging lens in this example satisfies d3s / T34 = 14.50 and f3 / (d2s-d3s) = -11.47. This example is referred to as Example 2.

[0056] The stray light spot pattern is a simulation of geometrical ray spots formed on the imaging surface. It shows the energy intensity distribution of stray light, with the X and Y axes representing the spatial position on the imaging surface. It also displays the energy distribution peaks of the stray light on the imaging surface, and the color intensity represents the strength of the stray light energy, i.e., the luminous flux per square millimeter on the imaging surface (unit: lumens / mm).

[0057] like Figure 21 As shown, when the optical imaging lens satisfies d3s / T34 = 7.59 and f3 / (d2s-d3s) = -11.47, the light transmission is relatively uniform. Stray light emanating from the second and third lenses is intercepted by the second and third spacer elements, respectively, resulting in less stray light on the imaging surface and lower stray light energy. Therefore, it can be concluded that the optical imaging lens in Scheme 1 has better imaging quality.

[0058] like Figure 22 As shown, when the optical imaging lens satisfies d3s / T34 = 0.50 and f3 / (d2s-d3s) = -11.47, the light is not uniform. Stray light emanating from the second and third lenses is not effectively intercepted by the spacer element, resulting in a large amount of stray light on the imaging surface with high energy. Therefore, it can be concluded that the imaging quality of the optical imaging lens in Example 1 is poor.

[0059] like Figure 23 As shown, when the optical imaging lens has d3s / T34 = 14.50 and f3 / (d2s-d3s) = -11.47, the light is not uniform. Stray light emanating from the second and third lenses is not effectively intercepted by the spacer element, resulting in a large amount of stray light on the imaging surface with high energy. Therefore, it can be concluded that the imaging quality of the optical imaging lens in Example 2 is poor.

[0060] In summary, when the optical imaging lens satisfies that the air gap between the third lens and the fourth lens on the optical axis is the largest and satisfies 5.45 < d3s / T34 < 8.10 and -17.90 < f3 / (d2s - d3s) < -7.25, the light transmission is relatively uniform. The stray light emitted from the second lens and the third lens is intercepted by the second spacer element and the third spacer element respectively, and the stray light on the imaging surface is the least, and the stray light energy is the lowest. Therefore, by constraining d3s / T34 and f3 / (d2s - d3s) within a reasonable range, the present application can intercept the stray light emitted from the second lens and the third lens, and at the same time constrain the degree of light deflection by the third lens and the air gap between the third lens and the fourth lens on the optical axis, so that the light is transmitted along a preset path, reducing the light with large-angle deflection, and further reducing the generation of stray light.

[0061] It should be noted that the present application constrains d3s / T34 and f3 / (dqs - d3s) within a reasonable range, and constrains the relationship between the second spacer element, the third spacer element, the third lens and the fourth lens, which can intercept the stray light generated by the front optical imaging lens, reduce the stray light transmitted to the fourth lens, and at the same time control the light transmission path, improve the imaging quality of the optical imaging lens, and solve the problem of stray light caused by the large air gap between the third lens and the fourth lens. When d3s / T34 and f3 / (d2s - d3s) are within the above ranges, the stray light of the optical imaging lens can be reduced, and it does not depend on the optical power and surface shape of other lenses. The optical power and surface shape of other lenses are further optimizations of the optical imaging lens on this basis. The optical power of each of the other lenses can be positive or negative according to the actual design requirements of the optical imaging lens, and the surface shape of each lens can be convex or concave according to the design requirements of the optical imaging lens. When the optical imaging lens satisfies 5.45 < d3s / T34 < 8.10; -17. < f3 / (d2s - d3s) < -7.25, the influence of stray light can be reduced while improving the assembly stability of the optical imaging lens.

[0062] For example, in some optional embodiments, the first lens has a negative optical power, which is beneficial for more light to enter the optical imaging lens and ensures the relative illumination of the optical imaging lens. For another example, in some optional embodiments, the second lens has a positive optical power, which can balance the aberration brought by the first lens and improve the imaging quality. For another example, in some optional embodiments, the third lens has a negative optical power, which diverges the light appropriately to make the light transition smoothly to the rear. For another example, in some optional embodiments, the fourth lens has a positive optical power, which balances the aberration brought by the front lens, improves the imaging quality, and converges the light appropriately, which is beneficial for the light to transition smoothly to the rear lens. For another example, in some optional embodiments, the object side surface of the first lens is convex, and the image side surface of the first lens is concave. The object side surface of the second lens is convex. The object side surface of the third lens is convex, and the image side surface of the third lens is concave. The object side surface of the fourth lens is convex. By reasonably constraining the surface types of each lens, it is beneficial to reasonably constrain the light trend, ensure the smooth transition of light, and is beneficial for correcting aberration.

[0063] The optical imaging lens can be simulated by software and / or tools such as ZEMAX, CODEV, etc. Preferably, the optical imaging lens can be simulated by CODEV. During the simulation using software and / or tools such as the above, the surface types of each lens can be simulated according to the built-in surface types of the software and / or tools used and adjusted appropriately.

[0064] In some optional embodiments, the air gap T34 between the third lens and the fourth lens on the optical axis and the maximum thickness CP3 of the third spacer in the optical axis direction satisfy: 16.20 < T34 / CP3 < 43.50. By constraining T34 / CP3 within a reasonable range, the air gap between the third lens and the fourth lens on the optical axis can be controlled to reduce the sensitivity of the optical imaging lens, which is beneficial for improving the assembly yield of the optical imaging lens. At the same time, ensuring the thickness of the third spacer can reduce the risk of baking deformation of the third spacer and control the problem of stray light formed by the reflection of the third spacer.

[0065] In some optional embodiments, the interval distance EP23 between the image side surface of the second spacer and the object side surface of the third spacer in the optical axis direction and the central thickness CT3 of the third lens on the optical axis satisfy: 1.42 < EP23 / CT3 < 2.40. By constraining EP23 / CT3 within a reasonable range, the difference between the central thickness and the edge thickness of the third lens can be effectively constrained, which is beneficial for the processing and demolding of the third lens, effectively reduces the appearance risk of the third lens, and ensures the optical performance of the optical imaging lens.

[0066] In some optional embodiments, the inner diameter d3m of the image side surface of the third spacer element and the effective focal length f4 of the fourth lens satisfy: 4.55 < f4 / d3m < 8.60. By restricting f4 / d3m within a reasonable range, the deflection angle of light in the fourth lens can be controlled, ensuring that the light entering the fourth lens through the third spacer element converges smoothly, reducing the light deflected into the optical structure area, which is beneficial to reducing stray light.

[0067] In some optional embodiments, the curvature radius R7 of the object side surface of the fourth lens and the inner diameter d3m of the image side surface of the third spacer element satisfy: 3.00 < R7 / d3m < 18.30. By restricting R7 / d3m within a reasonable range, stray light outside the effective light can be effectively blocked, ensuring that the light enters the fourth lens smoothly. At the same time, the deflection angle of the light when entering the fourth lens is controlled, reducing the deflection of large-angle light and improving the imaging quality.

[0068] In some optional embodiments, the inner diameter d3m of the image side surface of the third spacer element and the effective focal length f4 of the fourth lens satisfy: 4.55 < f4 / d3m < 8.60, and the curvature radius R7 of the object side surface of the fourth lens and the inner diameter d3m of the image side surface of the third spacer element satisfy: 3.00 < R7 / d3m < 18.30. By restricting the effective focal length and curvature radius of the fourth lens, the optical sensitivity of the surface shape can be reduced, and the resolution of the optical imaging lens can be improved. By reasonably controlling the inner diameter of the image side surface of the third spacer element through the relational formula, the stray light outside the effective light can be blocked, and the stray light reflected by the third spacer element can also be reduced, improving the imaging quality.

[0069] In some optional embodiments, the outer diameter D2s of the object side surface of the second spacer element, the inner diameter d2s of the object side surface of the second spacer element, and the central thickness CT2 of the second lens on the optical axis satisfy: 1.10 < (D2s - d2s) / CT2 < 1.95. By restricting (D2s - d2s) / CT2 within a reasonable range, the bearing range between the second spacer element and the second lens can be ensured, guaranteeing the stability of the assembly of the second lens group. At the same time, the central thickness of the second lens is controlled to ensure the structural strength of the second lens, further improving the assembly stability, and avoiding molding defects caused by the second lens being too thick or too thin.

[0070] In some optional embodiments, the air gap T34 between the third lens and the fourth lens on the optical axis and the air gap T23 between the second lens and the third lens on the optical axis satisfy: 14.95 < T34 / T23 < 20.68. By restricting T34 / T23 within a reasonable range, the air gaps between the second lens, the third lens, and the fourth lens can be ensured, avoiding problems such as interference between the front and rear lenses during the assembly process due to too small gaps.

[0071] In some optional embodiments, the distance EP23 between the image side of the second spacer element and the object side of the third spacer element in the optical axis direction and the effective focal length f3 of the third lens satisfy: -10.40 < f3 / EP23 < -6.85. By restricting f3 / EP23 within a reasonable range, the deflection angle of light in the third lens can be controlled to reduce the light with large-angle deflection. At the same time, restricting the distance between the second spacer element and the third spacer element is beneficial to improving the assembly stability and reducing the reliability risk.

[0072] In some optional embodiments, the air gap T34 between the third lens and the fourth lens on the optical axis and the air gap T23 between the second lens and the third lens on the optical axis satisfy: 14.95 < T34 / T23 < 20.68. The distance EP23 between the image side of the second spacer element and the object side of the third spacer element in the optical axis direction and the effective focal length f3 of the third lens satisfy: -10.40 < f3 / EP23 < -6.85. By restricting T34, T23, f3, and EP23, it can ensure the smooth transmission of light at the third lens, reduce the light with large-angle deflection, which is beneficial to reducing the generation of stray light. At the same time, it reduces the sensitivity of the third lens and improves the assembly stability.

[0073] In some optional embodiments, the inner diameter d2m of the image side of the second spacer element and the central thickness CT3 of the third lens on the optical axis satisfy: 6.62 < d2m / CT3 < 10.55. By restricting d2m / CT3 within a reasonable range, the relationship between the optical effective diameter region and the central thickness of the third lens can be indirectly restricted, ensuring the shape of the third lens and reducing the molding difficulty of the third lens.

[0074] In some optional embodiments, the maximum thickness CP3 of the third spacer element in the optical axis direction and the axial distance SAG41 between the intersection of the object side of the fourth lens and the optical axis and the vertex of the effective radius of the object side of the fourth lens satisfy: 1.25 < SAG41 / CP3 < 5.92. By restricting SAG41 / CP3 within a reasonable range, the height of the marginal rays can be effectively reduced, controlling the generation of stray light caused by excessive light. At the same time, restricting the thickness of the third spacer element ensures the structural strength of the third spacer element, which is beneficial to improving the assembly stability between the third spacer element and the fourth lens and is beneficial to improving the stability of the optical imaging lens in high-temperature and high-humidity environments.

[0075] In some optional embodiments, the inner diameter of the object side of the second spacer element is greater than the inner diameter of the object side of the third spacer element. The center thickness CT3 of the third lens on the optical axis and the center thickness CT2 of the second lens on the optical axis satisfy: 2.27 < CT2 / CT3 < 4.55. By restricting CT2 / CT3 within a reasonable range, while ensuring the processability of the second lens and the third lens, it is beneficial to the miniaturization of the optical imaging lens.

[0076] In some optional embodiments, the spacer element group further includes a first spacer element. The first spacer element is located between the first lens and the second lens and is partially in contact with the image side of the first lens. The effective focal length f1 of the first lens and the outer diameter D1s of the object side of the first spacer element satisfy: -21.25 < f1 / D1s < -19.40. By restricting f1 / D1s within a reasonable range, the size of the front end of the optical imaging lens can be restricted, which is beneficial to the miniaturization of the optical imaging lens. At the same time, it is beneficial to control the deflection angle of light in the first lens, which is beneficial to the smooth entry of light into the first lens. Reasonably setting the effective focal length of the first lens is beneficial to balancing the aberration of the optical imaging lens and improving the imaging quality.

[0077] In some optional embodiments, the spacer element group further includes a first spacer element. The first spacer element is located between the first lens and the second lens and is partially in contact with the image side of the first lens. The inner diameter of the object side of the first spacer element is greater than the inner diameter of the object side of the second spacer element. The spacing distance EP12 between the image side of the first spacer element and the object side of the second spacer element in the optical axis direction and the effective focal length f2 of the second lens satisfy: 6.80 < f2 / EP12 < 11.91. The inner diameter of the object side of the first spacer element being greater than the inner diameter of the object side of the second spacer element can effectively block the stray light reflected in the second lens, improving the molding quality. At the same time, by restricting the range of f2 / EP12, the deflection degree of light by the second lens can be controlled, further reducing the reflected stray light. It can also ensure the thickness ratio of the second lens as a whole, reducing the molding difficulty and sensitivity of the second lens, and ensuring the stability of the optical performance.

[0078] In some optional embodiments, the spacer element group further includes a first spacer element. The first spacer element is located between the first lens and the second lens and contacts a part of the image side surface of the first lens. The inner diameter d1m of the image side surface of the first spacer element and the central thickness CT2 of the second lens on the optical axis satisfy: 2.56 < d1m / CT2 < 3.61. By constraining d1m / CT2 within a reasonable range, the central thickness of the second lens can be constrained, which is beneficial to the miniaturization of the optical imaging lens while ensuring the structural strength of the second lens. At the same time, by constraining the inner diameter of the image side surface of the first spacer element, the bearing range between the first spacer element and the second lens can be ensured, and the deformation risk of the first spacer element in reliability items such as high temperature and high humidity can be reduced, thereby effectively blocking the transmission of stray light of the effective light and improving the imaging quality.

[0079] In some optional embodiments, the spacer element group further includes a first spacer element. The first spacer element is located between the first lens and the second lens and contacts a part of the image side surface of the first lens. The outer diameters of the multiple spacer elements in the spacer element group gradually decrease from the object side to the image side, and the inner diameter of the third spacer element in the spacer element group is the smallest. Such a setting is beneficial to realizing that the outer diameter of the lens barrel gradually decreases from the object side to the image side, which is beneficial to the miniaturization of the optical imaging lens. At the same time, by constraining the inner diameter of the third spacer element to be the smallest, the stray light transmitted from the front optical imaging lens can be effectively reduced, and the imaging quality of the optical imaging lens can be improved.

[0080] In some optional embodiments, the inner diameter d0s of the object side end surface of the lens barrel and the inner diameter d0m of the image side end surface of the lens barrel satisfy: 1.39 < d0s / d0m < 2.03. By constraining d0s / d0m within a reasonable range, the difference in the inner diameters of the object side end surface and the image side end surface of the lens barrel can be ensured, and the wall thickness uniformity of the overall lens barrel can be guaranteed, which is beneficial to the molding of the lens barrel and is beneficial to realizing miniaturization. At the same time, in a miniaturized optical imaging lens, it is possible to avoid excessive differences in the outer diameters of the lenses from affecting the assembly stability.

[0081] In some optional embodiments, the axial distance SAG32 between the intersection of the image side surface of the third lens and the optical axis and the vertex of the effective radius of the image side surface of the third lens and the maximum thickness CP3 of the third spacer element in the optical axis direction satisfy: 16.35 < SAG32 / CP3 < 41.60. By constraining SAG32 / CP3 within a reasonable range, the third lens can be prevented from being too curved, reducing the molding difficulty of the third lens. At the same time, by constraining the thickness of the third spacer element, the bearing force of the third spacer element on the front and rear lenses can be ensured, which is beneficial to improving the assembly stability among the third lens, the third spacer element and the fourth lens, and reducing the assembly deformation amount of the third spacer element.

[0082] In some optional embodiments, please refer to Figure 20, the optical imaging lens further includes a trapezoidal prism 10. The trapezoidal prism 10 is located on the image side of the lens group and reflects the light emitted from the fourth lens back to the imaging surface. The setting of the trapezoidal prism 10 can increase the optical path of the optical imaging lens, which is beneficial to increasing the effective focal length of the optical imaging lens, enabling the optical imaging lens to take into account both long focal length and miniaturization at the same time.

[0083] It should be noted that the trapezoidal prism 10 is a three-dimensional structure, and the lower bottom surface of the trapezoidal prism 10 is located on the side close to the lens group.

[0084] Optionally, the trapezoidal prism 10 is a three-dimensional isosceles trapezoid.

[0085] On the other hand, in another alternative embodiment, the optical imaging lens includes a lens barrel, a lens group and a spacer element group arranged in the lens barrel. The lens group consists of four lenses. The lens group includes a first lens with negative optical power, a second lens with positive optical power, a third lens with negative optical power, and a fourth lens with positive optical power arranged in sequence along the optical axis direction from the object side to the image side. Among the adjacent two lenses in the lens group, the air gap between the third lens and the fourth lens on the optical axis is the largest; the spacer element group at least includes a second spacer element and a third spacer element. The second spacer element is located between the second lens and the third lens and is partially in contact with the image side surface of the second lens. The third spacer element is located between the third lens and the fourth lens and is partially in contact with the image side surface of the third lens; the air gap T 34 between the third lens and the fourth lens on the optical axis and the maximum thickness CP 3 of the third spacer element in the optical axis direction satisfy: 16.20 < T 34 / CP 3 < 43.50; the inner diameter d 3s of the object side surface of the third spacer element, the inner diameter d 2s of the object side surface of the second spacer element, and the effective focal length f 3 of the third lens satisfy: -17.90 < f 3 / (d 2s - d 3s) < -7.25.

[0086] The optical imaging lens of the present application consists of a lens barrel, four lenses, and at least two spacer elements. When the air gap on the optical axis between two adjacent lenses in the lens group is the largest between the third lens and the fourth lens, when light travels between the third lens and the fourth lens, large-angle light is prone to deflect into the optical structure area of the fourth lens and form stray light. In the present application, by constraining T34 / CP3 and f3 / (d2s - d3s) within a reasonable range, the stray light emitted from the second lens and the third lens can be intercepted. At the same time, the degree of light deflection by the third lens and the air gap between the third lens and the fourth lens on the optical axis are constrained, so that the light travels along a preset path, reducing the large-angle deflected light, and thus reducing the generation of stray light. Controlling the air gap between the third lens and the fourth lens on the optical axis to reduce the sensitivity of the optical imaging lens is beneficial to improving the assembly yield of the optical imaging lens. At the same time, ensuring the thickness of the third spacer element can control the problem of stray light formed by the reflection of the third spacer element while reducing the risk of baking deformation of the third spacer element.

[0087] Of course, other parametric formulas in the above embodiments may also be included in this embodiment, which will not be elaborated here one by one.

[0088] On the other hand, in another optional embodiment, the optical imaging lens includes a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens group consists of four lenses. The lens group includes a first lens with a negative optical power, a second lens with a positive optical power, a third lens with a negative optical power, and a fourth lens with a positive optical power arranged in sequence along the optical axis from the object side to the image side; the spacer element group at least includes a second spacer element and a third spacer element. The second spacer element is located between the second lens and the third lens and is partially in contact with the image side surface of the second lens. The third spacer element is located between the third lens and the fourth lens and is partially in contact with the image side surface of the third lens. The inner diameter of the third spacer element in the spacer element group is the smallest; the inner diameter d0s of the object side end face of the lens barrel and the inner diameter d3s of the object side surface of the third spacer element satisfy: 1.80 < d0s / d3s < 2.20; the curvature radius R3 of the object side surface of the second lens, the refractive index N2 of the second lens, the inner diameter d2s of the object side surface of the second spacer element, the curvature radius R5 of the object side surface of the third lens, the refractive index N3 of the third lens, and the inner diameter d3s of the object side surface of the third spacer element satisfy: 2.95 < R3×N2 / d2s + R5×N3 / d3s < 4.20.

[0089] The optical imaging lens of the present application consists of a lens barrel, four lenses and at least two spacer elements. The inner diameter of the third spacer element in the spacer element group is the smallest, and the inner diameter d0s of the object-side end face of the lens barrel and the inner diameter d3s of the object-side face of the third spacer element satisfy: when 1.80 < d0s / d3s < 2.20, the relative illumination of the optical imaging lens can be ensured, and the imaging quality of the optical imaging lens can be ensured. However, due to the large diameter of the object-side port of the lens barrel, stray light is likely to enter the optical imaging lens. In order to reduce the generation of stray light, in the present application, by constraining R3×N2 / d2s + R5×N3 / d3s within a reasonable range, the deflection angle of light rays between the second lens and the third lens can be controlled, the light rays with large-angle deflection can be reduced, and thus the generation of stray light can be reduced. At the same time, by controlling the inner diameters of the second spacer element and the third spacer element, the stray light can be blocked, and the stray light entering the rear optical imaging lens can be reduced, which is beneficial to improving the imaging quality of the optical imaging lens.

[0090] Of course, other parametric formulas in the above embodiments may also be included in this embodiment, which will not be elaborated here one by one.

[0091] Optionally, the above optical imaging lens may further include a protective glass located in front of the imaging surface.

[0092] Optionally, the above optical imaging lens may further include a protective glass for protecting the photosensitive element located on the imaging surface.

[0093] It should be noted that each lens consists of an optical effective diameter region located at the center and an optical structure region located at the edge. The optical structure region is located on the outer peripheral side of the optical effective diameter region and is arranged circumferentially around the optical effective diameter region. The optical effective diameter region is used for the passage of imaging light rays, while the optical structure region is not used for the passage of imaging light rays. The optical structure region is used to abut against the lens barrel, an adjacent lens or an adjacent spacer element. The optical structure region is also called a non-effective diameter region.

[0094] In the optical imaging lens of the present application, multiple lenses can be used, such as the four lenses mentioned above. In the present application, at least one of the lens surfaces of each lens is an aspherical surface. The characteristics of an aspherical lens are that the curvature changes continuously from the center of the lens to the periphery of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and improving astigmatism aberration (astigmatism is also called astigmatism). After using an aspherical lens, the aberration that appears during imaging can be eliminated as much as possible, thereby improving the imaging quality.

[0095] 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.

[0096] Figure 1 A schematic diagram showing the dimensions of an optical imaging lens according to this application is provided. Figure 1 The figures clearly indicate parameters such as d1m, D1s, d2s, d2m, D2s, d3s, d3m, d0s, d0m, EP12, EP23, and CP3 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 figures when describing specific embodiments.

[0097] It should be noted that, in the process of light traveling from the object being photographed to the imaging surface, along the direction of light transmission, the object side refers to the side of the optical element that receives the light, or the side where the light first passes through the optical element along the direction of light transmission. The image side refers to the side of the optical element that emits light, or the side where the light last passes through the optical element along the direction of light transmission. The object-side end face of the lens barrel refers to the surface of the lens barrel located in front of the optical element in the direction of light transmission and perpendicular to the optical axis. The image-side end face of the lens barrel refers to the surface of the lens barrel located behind the optical element in the direction of light transmission and perpendicular to the optical axis. The object-side surface of the spacer element refers only to the surface of the spacer element that contacts the optical element in front of it and is perpendicular to the optical axis; the image-side surface of the spacer element refers only to the surface of the spacer element that contacts the optical element behind it and is perpendicular to the optical axis. In the direction of light transmission, among two adjacent optical elements, the light first passes through the optical element in front and then the optical element behind.

[0098] Aberration refers to the phenomenon that, due to physical limitations or design flaws, the actual image formed by an optical imaging lens deviates from the ideal image during imaging.

[0099] Astigmatism: For the entire narrow beam, at the meridional focal point, a short line perpendicular to the meridional plane is obtained, called the meridional focal line; at the sagittal focal point, a short line perpendicular to the meridional focal line and located on the meridional plane is obtained, called the sagittal focal line; at other positions, the beam cross-section is an elliptical blur spot; at the middle position of the two focal lines, a circular blur spot is obtained. A beam with this structure is called an astigmatic beam, and this imaging defect is called astigmatism.

[0100] Distortion: Because lenses have different magnifications for different parts of the same object, images are distorted and warped, with the distortion being more pronounced at the edges. This aberration is called distortion. Distortion manifests in two different ways: when the magnification at the edges is greater than that at the center, straight lines in the image will curve inwards towards the center, called pincushion distortion, also known as positive distortion; when the magnification at the edges is less than that at the center, straight lines in the image will curve outwards, called barrel distortion, also known as negative distortion.

[0101] Relative illumination refers to the ability of an optical imaging lens to reach its maximum aperture, which is the ratio of the maximum amount of incident light to the minimum amount of incident light.

[0102] 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.

[0103] It should be noted that in the following Embodiment 1, there are Embodiments 1-1, 1-2, and 1-3; in Embodiment 2, there are Embodiments 2-1, 2-2, and 2-3; and in Embodiment 3, there are Embodiments 3-1, 3-2, and 3-3. In the three embodiments within the same embodiment, the curvature radius, center thickness, and other parameters of the first to fourth lenses of the optical imaging lens, as well as the spacing distance between lenses and higher-order coefficients, are the same. However, the thickness, inner diameter, and outer diameter of the lens barrel, the first spacer element, the second spacer element, and the third spacer element, and the shape of some lenses are different. In other words, the main structure used for imaging is the same, but the auxiliary structures used for imaging are different.

[0104] It should be noted that any of the embodiments described in Examples 1 to 3 below are applicable to all implementation methods of this application.

[0105] Example 1

[0106] like Figures 2 to 8 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 The diagram shows the structure of the optical imaging lens in Embodiments 1-2. Figure 4 A schematic diagram of the optical imaging lens of Embodiments 1-3 is shown.

[0107] like Figures 2 to 4 As shown, the optical imaging lens includes a lens barrel, four lenses and multiple spacer elements. The lens barrel includes a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3 and a fourth lens E4 arranged sequentially from the object side to the image side.

[0108] like Figure 2 The diagram shows a schematic of the optical imaging lens in Embodiment 1-1. In this embodiment, the object-side and image-side surfaces of the first spacer element P1 are in partial contact with the image-side surface S2 of the first lens and the object-side surface S3 of the second lens, respectively. The object-side surface of the second spacer element P2 is in partial contact with the image-side surface S4 of the second lens. The object-side and image-side surfaces of the third spacer element P3 are in partial contact with the image-side surface S6 of the third lens and the object-side surface S7 of the fourth lens, respectively. The image-side surface S8 of the fourth lens is in contact with the lens barrel.

[0109] like Figure 3 The diagram shown is a structural schematic of the optical imaging lens of Embodiment 1-2. The bearing and contact methods of each spacer element are the same as in Embodiment 1-1, and can be referred to the relevant description in Embodiment 1-1, which will not be repeated here.

[0110] like Figure 4 The diagram shown is a structural schematic of the optical imaging lens of Embodiments 1-3. The bearing and contact methods of each spacer element are the same as those in Embodiment 1-1, and can be referred to the relevant descriptions in Embodiment 1-1, which will not be repeated here.

[0111] In addition, a second auxiliary spacer element can be set between the second spacer element P2 and the third lens E3 according to actual needs, without specific restrictions here.

[0112] In summary, the structural parameters of the optical imaging lens of Embodiment 1 under Embodiments 1-1, 1-2, and 1-3 are shown in Table 8.

[0113] In Embodiment 1, the first lens E1 has negative optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The first 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 negative optical power, its object-side surface S5 is convex, and its image-side surface S6 is concave. The fourth lens E4 has positive optical power, its object-side surface S7 is convex, and its image-side surface S8 is concave. In Table 1, OBJ (not shown in the figure) represents the object surface of the optical imaging lens; S9 and S10 (not shown in the figure) can be the object-side and image-side surfaces of a filter or protective glass; S11 (not shown in the figure) is the imaging surface of the optical imaging lens; and STO (not shown in the figure) is the aperture stop, located on the image-side surface S8 of the fourth lens.

[0114] Table 1 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). In Table 1, T represents a trapezoidal prism, and positive numbers in the thickness represent the distance from the object side to the image side, while negative numbers represent the distance from the image side to the object side.

[0115]

[0116] Table 1

[0117] In Embodiment 1, the object-side surface and image-side surface of the second lens E2 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:

[0118]

[0119] 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 2 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical mirror S3-S8 in Example 1.

[0120] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S3 3.1690E-03 -6.6698E-04 2.0924E-04 -6.0101E-05 1.1698E-05 -1.2499E-06 5.9125E-08 -1.8087E-11 -6.2463E-11 S4 1.1205E-03 1.3689E-03 -1.3930E-03 6.1342E-04 -1.4624E-04 2.0878E-05 -1.8470E-06 9.7127E-08 -2.3819E-09 S5 -2.4305E-02 8.7751E-03 -3.8871E-03 1.7009E-03 -5.2172E-04 1.0277E-04 -1.2593E-05 8.7895E-07 -2.6681E-08 S6 -4.3499E-02 1.7573E-02 -1.0542E-02 7.5935E-03 -3.7454E-03 1.1291E-03 -2.0246E-04 1.9889E-05 -8.2371E-07 S7 -2.6092E-02 8.1252E-03 4.5615E-04 -3.0842E-04 -2.8023E-04 1.7816E-04 -4.3021E-05 4.9785E-06 -2.2915E-07 S8 -1.4305E-02 3.5324E-03 2.0203E-03 -1.3535E-03 2.9472E-04 -1.7816E-05 -3.2050E-06 5.5824E-07 -2.3872E-08

[0121] Table 2

[0122] Figure 5 The astigmatism curve (also known as the astigmatic 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 relative illumination curve of the optical imaging lens of Embodiment 1 is shown, which represents the relative illumination corresponding to different field of view angles.

[0123] according to Figures 5 to 7 As can be seen, the optical imaging lens given in Example 1 can achieve good imaging quality.

[0124] Example 2

[0125] 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. Figure 10 A schematic diagram of the optical imaging lens of Embodiments 2-3 is shown.

[0126] like Figures 8 to 10As shown, the optical imaging lens includes a lens barrel, four lenses and multiple spacer elements. The lens barrel includes a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3 and a fourth lens E4 arranged sequentially from the object side to the image side.

[0127] like Figure 8 The diagram shows a schematic of the optical imaging lens in Embodiment 2-1. In this embodiment, the object-side and image-side of the first spacer element P1 are in partial contact with the image-side S2 of the first lens and the object-side S3 of the second lens, respectively. The object-side of the second spacer element P2 is in partial contact with the image-side S4 of the second lens. The object-side and image-side of the third spacer element P3 are in partial contact with the image-side S6 of the third lens and the object-side S7 of the fourth lens, respectively. The image-side S8 of the fourth lens is in contact with the lens barrel.

[0128] like Figure 9 The diagram shown is a structural schematic of the optical imaging lens of Embodiment 2-2. The bearing and contact methods of each spacer element are the same as in Embodiment 2-1, and can be referred to the relevant description in Embodiment 2-1, which will not be repeated here.

[0129] like Figure 10 The diagram shown is a structural schematic of the optical imaging lens of Embodiment 2-3. The bearing and contact methods of each spacer element are the same as in Embodiment 2-1, and can be referred to the relevant description in Embodiment 2-1, which will not be repeated here.

[0130] In addition, a second auxiliary spacer element can be set between the second spacer element P2 and the third lens E3 according to actual needs, without specific restrictions here.

[0131] In summary, the structural parameters of the optical imaging lens of Embodiment 2 under Embodiments 2-1, 2-2, and 2-3 are shown in Table 8.

[0132] In Embodiment 2, the first lens E1 has negative optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The first lens E2 has positive optical power, its object-side surface S3 is convex, and its image-side surface S4 is convex. The third lens E3 has negative optical power, its object-side surface S5 is convex, and its image-side surface S6 is concave. The fourth lens E4 has positive optical power, its object-side surface S7 is convex, and its image-side surface S8 is convex. In Table 3, OBJ (not shown in the figure) represents the object surface of the optical imaging lens; S9 and S10 (not shown in the figure) can be the object-side and image-side surfaces of a filter or protective glass; S11 (not shown in the figure) is the imaging surface of the optical imaging lens; and STO (not shown in the figure) is the aperture stop, located on the image-side surface S8 of the fourth lens.

[0133] Table 3 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). In Table 3, T represents a trapezoidal prism, and positive numbers in the thickness represent the distance from the object side to the image side, while negative numbers represent the distance from the image side to the object side.

[0134]

[0135] Table 3

[0136] Table 4 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical mirror S3-S8 in Example 2. The aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0137] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S3 1.0646E-03 1.7875E-04 -8.3421E-05 2.4035E-05 -4.6412E-06 6.6812E-07 -6.5291E-08 3.6777E-09 -8.7537E-11 S4 -3.4729E-03 3.4412E-03 -8.6291E-04 -2.2703E-04 2.1492E-04 -6.0147E-05 8.3234E-06 -5.7746E-07 1.6020E-08 S5 -2.4792E-02 1.2652E-03 4.9870E-03 -3.5331E-03 1.2917E-03 -2.7876E-04 3.5255E-05 -2.4062E-06 6.8285E-08 S6 -2.5518E-02 -1.1254E-02 1.7720E-02 -1.0232E-02 3.3199E-03 -6.0595E-04 5.3165E-05 -7.9879E-07 -1.1650E-07 S7 2.6975E-03 -1.5216E-02 1.7972E-02 -1.0438E-02 3.5700E-03 -7.0940E-04 7.3606E-05 -2.7810E-06 -4.0934E-08 S8 3.5572E-03 -9.2533E-03 1.0774E-02 -6.3320E-03 2.2546E-03 -4.9507E-04 6.3987E-05 -4.3423E-06 1.1373E-07

[0138] Table 4

[0139] Figure 11 The astigmatism curve (also known as the astigmatic 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 in Embodiment 2 is shown, which represents the distortion magnitude value corresponding to different field of view angles. Figure 13 The relative illumination curve of the optical imaging lens of Embodiment 2 is shown, which represents the relative illumination corresponding to different field of view angles.

[0140] according to Figures 11 to 13 It can be seen that the optical imaging lens given in Example 2 can achieve good imaging quality.

[0141] Example 3

[0142] 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. Figure 16 A schematic diagram of the optical imaging lens of Embodiment 3-3 is shown.

[0143] like Figures 14 to 16 As shown, the optical imaging lens includes a lens barrel, four lenses and multiple spacer elements. The lens barrel includes a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3 and a fourth lens E4 arranged sequentially from the object side to the image side.

[0144] like Figure 14The diagram shows a schematic of the optical imaging lens in Embodiment 3-1. In this embodiment, the object-side and image-side of the first spacer element P1 are in partial contact with 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 element P2 are in partial contact with 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 element P3 are in partial contact with the image-side S6 of the third lens and the object-side S7 of the fourth lens, respectively, and the image-side S8 of the fourth lens is in contact with the lens barrel portion.

[0145] like Figure 15 The diagram shown is a structural schematic of the optical imaging lens of Embodiment 3-2. The abutment and contact methods of each spacer element are the same as in Embodiment 3-1, and can be referred to the relevant description in Embodiment 3-1, which will not be repeated here.

[0146] like Figure 16 The diagram shown is a structural schematic of the optical imaging lens of Embodiment 3-3. The bearing and contact methods of each spacer element are the same as those in Embodiment 3-1, and can be referred to the relevant description in Embodiment 3-1, which will not be repeated here.

[0147] In summary, the structural parameters of the optical imaging lens of Embodiment 3 under Embodiments 3-1, 3-2, and 3-3 are shown in Table 8.

[0148] In Embodiment 3, the first lens E1 has negative optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The first 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 negative optical power, its object-side surface S5 is convex, and its image-side surface S6 is concave. The fourth lens E4 has positive optical power, its object-side surface S7 is convex, and its image-side surface S8 is convex. In Table 5, OBJ (not shown in the figure) represents the object surface of the optical imaging lens; S9 and S10 (not shown in the figure) can be the object-side and image-side surfaces of a filter or protective glass; S11 (not shown in the figure) is the imaging surface of the optical imaging lens; and STO (not shown in the figure) is the aperture stop, located on the image-side surface S8 of the fourth lens.

[0149] Table 5 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). In Table 5, T represents a trapezoidal prism, and positive numbers in the thickness represent the distance from the object side to the image side, while negative numbers represent the distance from the image side to the object side.

[0150]

[0151]

[0152] Table 5

[0153] Table 6 below shows the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical mirror S3-S8 in Example 3. Among them, each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0154] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S3 2.1151E-03 -4.8252E-05 -7.8560E-05 4.0220E-05 -1.1254E-05 2.0947E-06 -2.4089E-07 1.5166E-08 -3.9522E-10 S4 4.1836E-03 -3.1526E-03 1.9052E-03 -8.3575E-04 2.5822E-04 -5.0136E-05 5.6495E-06 -3.3205E-07 7.7132E-09 S5 -1.6630E-02 1.2094E-03 1.3832E-03 -7.3045E-04 2.0770E-04 -3.6654E-05 3.7014E-06 -1.7805E-07 2.3924E-09 S6 -3.6851E-02 1.0272E-02 -6.2984E-03 6.4158E-03 -3.7464E-03 1.2312E-03 -2.3227E-04 2.3541E-05 -9.9358E-07 S7 -2.1447E-02 4.7116E-03 -3.0680E-03 5.4448E-03 -3.7177E-03 1.3055E-03 -2.5608E-04 2.6693E-05 -1.1525E-06 S8 -8.9064E-03 -8.6624E-04 3.3566E-03 -1.2864E-03 1.5665E-04 1.9085E-05 -8.0572E-06 9.1132E-07 -3.6264E-08

[0155] Table 6

[0156] Figure 17 The astigmatism curve (also known as the astigmatic 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 relative illumination curve of the optical imaging lens of Embodiment 3 is shown, which represents the relative illumination corresponding to different field of view angles.

[0157] according to Figures 17 to 19 It can be seen that the optical imaging lens given in Example 3 can achieve good imaging quality.

[0158] In summary, the optical imaging lenses of Examples 1 to 3 respectively satisfy the relationships shown in Table 7.

[0159]

[0160]

[0161] Tables 7 and 8 show some parameters (unit: millimeters) of the optical imaging lenses of Examples 1 to 3.

[0162] Parameters / Examples 1-1 1-2 1-3 2-1 2-2 2-3 3-1 3-2 3-3 d1m 6.5244 6.5068 6.4407 6.7856 6.7139 6.5157 6.2603 6.1991 6.1641 D1s 8.8828 9.2542 8.7336 8.8427 8.5320 9.0774 8.8628 8.4931 9.2434 d2s 5.7028 5.6154 5.9048 5.6435 5.4957 5.8093 5.5222 5.4183 5.8086 d2m 5.7028 5.6154 5.9048 5.6435 5.4957 5.8093 5.5222 5.4183 5.8086 D2s 8.7228 9.0942 8.4936 8.6827 8.3507 8.9174 8.7028 8.3331 9.0834 d3s 4.6377 4.5250 4.6794 4.6377 4.6954 4.7499 4.6377 4.8260 4.3580 d3m 4.6377 4.5250 4.6794 4.6377 4.6954 4.7499 4.6377 4.8260 4.3580 d0s 9.3541 9.7255 9.2048 9.0957 8.7849 9.5374 9.1358 8.7661 9.5164 d0m 6.4870 4.9039 5.7583 6.0230 5.5936 5.1793 5.1263 5.1262 5.9055 EP12 0.9083 0.8683 0.8986 1.0321 1.1476 1.1426 0.9460 0.9327 0.9609 EP23 1.3689 1.4517 1.3446 1.2985 1.2346 1.2830 1.2189 1.2841 1.1915 CP3 0.0190 0.0280 0.0220 0.0170 0.0300 0.0240 0.0160 0.0370 0.0330 FOV (°) 23.1054 23.1054 23.1054 23.4130 23.4130 23.4130 23.2640 23.2640 23.2640 Fno 2.8115 2.8115 2.8115 2.8115 2.8115 2.8115 2.8115 2.8115 2.8115 f 19.2878 19.2878 19.2878 19.0412 19.0412 19.0412 19.1795 19.1795 19.1795 f1 -180.0000 -180.0000 -180.0000 -181.0000 -181.0000 -181.0000 -180.0001 -180.0001 -180.0001 f2 10.3022 10.3022 10.3022 7.8621 7.8621 7.8621 9.6592 9.6592 9.6592 f3 -14.0612 -14.0612 -14.0612 -8.9519 -8.9519 -8.9519 -10.5771 -10.5771 -10.5771 f4 38.7783 38.7783 38.7783 35.2678 35.2678 35.2678 22.1100 22.1100 22.1100 SAG32 0.7893 0.7893 0.7893 0.6366 0.6366 0.6366 0.6068 0.6068 0.6068 SAG41 0.0362 0.0362 0.0362 0.0998 0.0998 0.0998 0.0803 0.0803 0.0803

[0163] Table 8

[0164] 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.

[0165] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0166] 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.

[0167] 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.

[0168] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An optical imaging lens, characterized in that, It includes a lens barrel and a lens assembly and a spacer assembly disposed within the lens barrel. The lens group consists of four lenses, including a first lens with negative optical power, a second lens with positive optical power, a third lens with negative optical power, and a fourth lens with positive optical power, arranged sequentially from the object side to the image side along the optical axis. Among the adjacent lenses in the lens group, the air gap between the third lens and the fourth lens on the optical axis is the largest. The spacer element group includes at least a second spacer element and a third spacer element, wherein the second spacer element is located between the second lens and the third lens and contacts the image-side side portion of the second lens, and the third spacer element is located between the third lens and the fourth lens and contacts the image-side side portion of the third lens; The inner diameter d3s of the object side of the third spacer element and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy the following: 5.48≤d3s / T34≤8.04; The inner diameter d3s of the object side of the third spacer element, the inner diameter d2s of the object side of the second spacer element, and the effective focal length f3 of the third lens satisfy the following condition: -17.86≤f3 / (d2s-d3s)≤-7.

29.

2. The optical imaging lens according to claim 1, characterized in that, The air gap T34 between the third lens and the fourth lens on the optical axis and the maximum thickness CP3 of the third spacer element in the optical axis direction satisfy the following condition: 16.23≤T34 / CP3≤43.

43.

3. The optical imaging lens according to claim 1, characterized in that, The distance EP23 between the image side of the second spacer element and the object side of the third spacer element in the optical axis direction, and the center thickness CT3 of the third lens in the optical axis, satisfy the following: 1.47≤EP23 / CT3≤2.

34.

4. The optical imaging lens according to claim 1, characterized in that, The inner diameter d3m of the image side of the third spacer element and the effective focal length f4 of the fourth lens satisfy the following condition: 4.58 ≤ f4 / d3m ≤ 8.57; The radius of curvature R7 of the object side of the fourth lens and the inner diameter d3m of the image side of the third spacer element satisfy the following condition: 3.01≤R7 / d3m≤18.

26.

5. The optical imaging lens according to claim 1, characterized in that, The outer diameter D2s of the object side of the second spacer element, the inner diameter d2s of the object side of the second spacer element, and the center thickness CT2 of the second lens on the optical axis satisfy the following: 1.14≤(D2s-d2s) / CT2≤1.

90.

6. The optical imaging lens according to claim 1, characterized in that, The air gap T34 between the third lens and the fourth lens on the optical axis, and the air gap T23 between the second lens and the third lens on the optical axis satisfy the following condition: 15.01≤T34 / T23≤20.63; The image-side surface of the second spacer element and the object-side surface of the third spacer element satisfy the following condition in the optical axis direction: distance EP23 and effective focal length f3 of the third lens: -10.

40. <f3 / EP23≤-6.89。 7. The optical imaging lens according to claim 1, characterized in that, The inner diameter d2m of the image side of the second spacer element and the center thickness CT3 of the third lens on the optical axis satisfy the following condition: 6.67≤d2m / CT3≤10.

48.

8. The optical imaging lens according to claim 1, characterized in that, The maximum thickness CP3 of the third spacer element in the optical axis direction and the on-axis distance SAG41 between the intersection of the object side surface of the fourth lens and the optical axis and the vertex of the effective radius of the object side surface of the fourth lens satisfy the following: 1.29≤SAG41 / CP3≤5.

87.

9. The optical imaging lens according to claim 1, characterized in that, The inner diameter of the object side of the second spacer element is greater than the inner diameter of the object side of the third spacer element, and the center thickness CT3 of the third lens on the optical axis and the center thickness CT2 of the second lens on the optical axis satisfy the following: 2.32≤CT2 / CT3≤4.

50.

10. The optical imaging lens according to any one of claims 1 to 9, characterized in that, The spacer element group further includes a first spacer element, which is located between the first lens and the second lens and contacts the image side surface of the first lens. The effective focal length f1 of the first lens and the outer diameter D1s of the object side surface of the first spacer element satisfy the following condition: -21.21≤f1 / D1s≤-19.

45.

11. The optical imaging lens according to any one of claims 1 to 9, characterized in that, The spacer group further includes a first spacer element, which is located between the first lens and the second lens and contacts the image side of the first lens. The image side of the first spacer element and the object side of the second spacer element satisfy the following condition between the distance EP12 between them in the optical axis direction and the effective focal length f2 of the second lens: 6.85≤f2 / EP12≤11.

86.

12. The optical imaging lens according to any one of claims 1 to 9, characterized in that, The spacer element group further includes a first spacer element, which is located between the first lens and the second lens and contacts the image side of the first lens. The inner diameter of the object side of the first spacer element is larger than the inner diameter of the object side of the second spacer element. The inner diameter d1m of the image side of the first spacer element and the center thickness CT2 of the second lens on the optical axis satisfy the following: 2.61≤d1m / CT2≤3.

56.

13. The optical imaging lens according to any one of claims 1 to 9, characterized in that, The spacer group further includes a first spacer element, which is located between the first lens and the second lens and contacts the image side of the first lens. The outer diameter of the multiple spacers in the spacer group gradually decreases from the object side to the image side, and the inner diameter of the third spacer element in the spacer group is the smallest.

14. The optical imaging lens according to any one of claims 1 to 9, characterized in that, The inner diameter d0s of the object-side end face of the lens tube and the inner diameter d0m of the image-side end face of the lens tube satisfy the following condition: 1.44≤d0s / d0m≤1.

98.

15. The optical imaging lens according to any one of claims 1 to 9, characterized in that, The axial distance SAG32 between the intersection of the image-side surface of the third lens and the optical axis and the vertex of the effective radius of the image-side surface of the third lens, and the maximum thickness CP3 of the third spacer element in the optical axis direction, satisfy the following: 16.4≤SAG32 / CP3≤41.54.

Images