Optical imaging lens

Abstract

The invention provides an optical imaging lens. The optical imaging lens comprises a lens barrel, a lens group and a spacing element group, wherein the lens group and the spacing element group are arranged in the lens barrel; the air interval of a third lens and a fourth lens on an optical axis is the largest in the air intervals of two adjacent lenses on the optical axis in the lens group; the spacing element group at least comprises a second spacing element and a third spacing element, and the inner diameter d3s of the object side surface of the third spacing element and the air spacing T34 of the third lens and the fourth lens on the optical axis meet the following conditions: 5.45 lt; d3s / T34lt; 8.10, 8.10; the inner diameter d3s of the object side surface of the third spacing element, the inner diameter d2s of the object side surface of the second spacing element and the effective focal length f3 of the third lens meet the following conditions:-17.90 lt; f3 / (d2s-d3s) lt; and-7.25. The optical imaging lens solves the problem that in the prior art, stray light is serious in order to meet the miniaturization requirement of an optical imaging lens.

Description

Technical Field

[0001] The present invention relates to the technical field of optical imaging devices, and more particularly, to an optical imaging lens. Background Art

[0002] With the development of mobile devices, especially the continuous development of camera technology in smart phones, while users' demand for optical imaging quality is increasing day by day, they also require mobile devices to develop in the direction of being thinner and lighter. In order to meet the requirements of thinner and lighter mobile devices, optical imaging lenses are gradually developing in the direction of miniaturization.

[0003] However, the internal space of a miniaturized optical imaging lens is limited, and interference is likely to occur during the lens assembly process. In order to reduce the interference generated during the lens assembly process, the air gap between the lenses at the tail end is usually designed to be relatively large. However, this will increase the optical path of light in the air gap, which directly leads to an increase in stray light outside the effective light rays. The generation of stray light not only reduces the imaging contrast but may also cause problems such as halos and color distortion, resulting in a decline in imaging quality. In a high-precision imaging system, even a tiny amount of stray light is sufficient to have a non-negligible impact on the final image. Especially in low-light environments, the interference effect of stray light is more obvious.

[0004] That is to say, in the prior art, there is a problem that the optical imaging lens has serious stray light in order to meet miniaturization. Summary of the Invention

[0005] The main object of the present invention is to provide an optical imaging lens to solve the problem that the optical imaging lens in the prior art has serious stray light in order to meet miniaturization.

[0006] To achieve the above object, according to one 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 is composed 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 spaces between adjacent two lenses in the lens group, the air space 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. 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 space 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.

[0007] 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 is composed 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 spaces between adjacent two lenses in the lens group, the air space 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. 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 air space 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; 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 is composed 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 includes at least 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 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 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 interval 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 effective focal length f3 of the third lens satisfy: -10.40 < f3 / EP23 < -6.85.

[0014] Furthermore, the inner diameter d2m of the image side surface 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.

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

[0016] Furthermore, the inner diameter of the object side surface of the second spacer element is greater 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: 2.27 < CT2 / CT3 < 4.55.

[0017] Furthermore, 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 in partial contact with the image side surface of the first lens, and 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: -21.25 < f1 / D1s < -19.40.

[0018] Furthermore, 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 in partial contact with the image side surface of the first lens, the inner diameter of the object side surface of the first spacer element is greater than the inner diameter of the object side surface of the second spacer element, and the interval 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 further includes a first spacer element, the first spacer element is located between the first lens and the second lens and is in partial contact with the image side surface of the first lens, and 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.

[0020] Furthermore, 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 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] Furthermore, 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] Furthermore, 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] Furthermore, the optical imaging lens further includes a trapezoidal prism which 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, a lens group and a spacer element group arranged in the lens barrel. The lens group is composed 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 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 the present application is composed 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 is transmitted between the third lens and the fourth lens, large-angle light is likely to deflect to the optical structure area of the fourth lens to 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, and at the same time, the degree of deflection of the third lens to light and the air gap on the optical axis between the third lens and the fourth lens are constrained, so that light is transmitted along a preset path, reducing the light with large-angle deflection, and further reducing the generation of stray light. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The specification drawings forming a part of the present application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0027] Figure 1 Shows the dimension marking diagram of the optical imaging lens of an optional embodiment of the present invention;

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

[0029] Figure 3 Shows a partial structural schematic diagram of the optical imaging lens of Embodiment 1-2 of the present invention;

[0030] Figure 4 Shows a partial structural schematic diagram of the optical imaging lens of Embodiment 1-3 of the present invention;

[0031] Figures 5 to 7 Respectively show the astigmatism curve, distortion curve and relative illumination curve diagram of the optical imaging lens of Embodiment 1 of the present invention;

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

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

[0034] Figure 10 Shows a partial structural schematic diagram of the optical imaging lens of Embodiment 2-3 of the present invention;

[0035] Figures 11 to 13 Respectively show the astigmatism curve, distortion curve and relative illumination curve diagram of the optical imaging lens of Embodiment 2 of the present invention;

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

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

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

[0039] Figures 17 to 19 Respectively show the astigmatism curve, distortion curve and relative illumination curve diagram of the optical imaging lens of Embodiment III of the present invention;

[0040] Figure 20 Shows an overall structural schematic diagram of the optical imaging lens of an alternative embodiment of the present invention;

[0041] Figure 21 Shows the stray light spot diagram of the optical imaging lens of an alternative embodiment of the present invention;

[0042] Figure 22 Shows the stray light spot diagram of the optical imaging lens of an example;

[0043] Figure 23 Shows the stray light spot diagram of the optical imaging lens of another example.

[0044] Among them, the above-mentioned drawings include the following reference numerals:

[0045] E1, the first lens; P1, the first spacer element; E2, the second lens; P2, the second spacer element; E3, the third lens; P3, the third spacer element; E4, the fourth lens; S1, the object side of the first lens; S2, the image side of the first lens; S3, the object side of the second lens; S4, the image side of the second lens; S5, the object side of the third lens; S6, the image side of the third lens; S7, the object side of the fourth lens; S8, the image side of the fourth lens; 10, the trapezoidal prism. Detailed implementation manners

[0046] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0047] It should be pointed out that unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0048] In the present invention, unless otherwise specified, the directional terms such as "upper", "lower", "top", and "bottom" generally refer to the directions shown in the drawings or to the vertical, perpendicular, or gravitational directions of the components themselves. Similarly, for the convenience of understanding and description, "inner" and "outer" refer to the inner and outer of the contours of the respective components themselves, but the above directional terms do not limit the present invention.

[0049] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teachings of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0050] In the drawings, for the convenience of illustration, the thickness, size, and shape of the lens have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are shown by way of example. That is, the spherical or aspherical shapes are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0051] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The judgment of the surface shape in the paraxial region can be based on the judgment method of those with ordinary knowledge in the field, and the concavity and convexity are judged by the positive and negative values of the R value (R refers to the radius of curvature of the paraxial region, usually the R value on the lens database (lens data) in optical software). Taking the object side as an example, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; taking the image side as an example, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface. In the present application, during the transmission of light, the front of the imaging light transmission is the object side, and the rear of the imaging light transmission is the image side. That is, among the two sides of the lens, the side that the imaging light passes through first is the object side of the lens, and the side that the imaging light passes through later is the image side of the lens.

[0052] In order to solve the problem in the prior art that the optical imaging lens has serious stray light in order to meet miniaturization, the present invention provides an optical imaging lens.

[0053] Such as 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 is composed of four lenses, and 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. Among the air spaces between adjacent two lenses in the lens group along the optical axis, the air space between the third lens and the fourth lens along the optical axis is the largest; the spacer element group includes at least 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 space 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 is composed of a lens barrel, four lenses, and at least two spacer elements. When the air space between the third lens and the fourth lens along the optical axis is the largest among the air spaces 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, and at the same time, the degree of deflection of the third lens to light and the air space between the third lens and the fourth lens along the optical axis are constrained, so that light is transmitted along a preset path, reducing the light with large-angle deflection, and thus reducing the generation of stray light.

[0055] In addition, referring to the following Figures 21 to 23 As shown in the figure, when the optical imaging lens satisfies that the air space between the third lens and the fourth lens along the optical axis is the largest among the air spaces between adjacent two lenses in the lens group, Figure 21 The stray light spot diagram of the optical imaging lens according to 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 23The stray light spot diagram of another example of an optical imaging lens is shown. Specifically, in this example, the optical imaging lens satisfies d3s / T34 = 14.50 and f3 / (d2s - d3s) = -11.47. Hereinafter, this example is referred to as Example 2.

[0056] Among them, the stray light spot diagram is a point array of geometric rays (Geometrical Ray SPOTS) formed by simulating geometric rays on the imaging surface. The stray light spot diagram shows the energy intensity distribution of stray light. The X and Y axes represent the spatial position of the imaging surface, and also show the peak position of the energy distribution of stray light corresponding on the imaging surface. The depth of color represents the strength of the energy of stray light, that is, the luminous flux per square millimeter of stray light on the imaging surface (unit: lumen / mm).

[0057] As Figure 21 shown, when the optical imaging lens satisfies d3s / T34 = 7.59 and f3 / (d2s - d3s) = -11.47, 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 there is less stray light on the imaging surface and the stray light energy is lower. It can be seen from this that the imaging quality of the optical imaging lens in Solution 1 is better.

[0058] As Figure 22 shown, when the optical imaging lens satisfies d3s / T34 = 0.50 and f3 / (d2s - d3s) = -11.47, the light is not uniform. The stray light emitted from the second lens and the third lens is not effectively intercepted by the spacer element, and there is more stray light on the imaging surface and the stray light energy is higher. It can be seen from this that the imaging quality of the optical imaging lens in Example 1 is poor.

[0059] As Figure 23 shown, when the optical imaging lens satisfies d3s / T34 = 14.50 and f3 / (d2s - d3s) = -11.47, the light is not uniform. The stray light emitted from the second lens and the third lens is not effectively intercepted by the spacer element, and there is more stray light on the imaging surface and the stray light energy is higher. It can be seen from this 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 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 of 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 / (d2s - 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 design requirements of the actual 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; -17.90 < 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 alternative embodiments, the first lens has a negative optical power, which is conducive to more light entering the optical imaging lens and ensuring the relative illumination of the optical imaging lens. For another example, in some alternative 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 alternative 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 alternative 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 conducive to the smooth transition of the light to the rear lens. For another example, in some alternative 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 restricting the surface types of the lenses, it is conducive to reasonably restricting the light path, ensuring the smooth transition of the light, and is conducive to correcting the 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 process using the software and / or tools as described above, the surface types of the lenses can be simulated according to the built-in surface types of the software and / or tools used and adjusted appropriately.

[0064] In some alternative 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 element in the optical axis direction satisfy: 16.20 < T34 / CP3 < 43.50. By restricting 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 conducive to improving the assembly yield of the optical imaging lens. At the same time, by ensuring the thickness of the third spacer element, the risk of baking deformation of the third spacer element can be reduced, and the problem of stray light formed by the reflection of the third spacer element can be controlled.

[0065] In some alternative embodiments, the interval 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. By restricting EP23 / CT3 within a reasonable range, the difference between the central thickness and the edge thickness of the third lens can be effectively restricted, which is conducive to the processing and demolding of the third lens, effectively reducing the appearance risk of the third lens and ensuring the optical performance of the optical imaging lens.

[0066] In some alternative embodiments, the following relationship is satisfied between the inner diameter d3m of the image side surface of the third spacer element and the effective focal length f4 of the fourth lens: 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 to ensure that the light entering the fourth lens through the third spacer element converges smoothly, reducing the light deflected into the optical structure region, which is beneficial to reducing stray light.

[0067] In some alternative embodiments, the following relationship is satisfied between 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: 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 alternative embodiments, the following relationships are satisfied: between the inner diameter d3m of the image side surface of the third spacer element and the effective focal length f4 of the fourth lens: 4.55 < f4 / d3m < 8.60; between 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: 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 expression, 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 alternative embodiments, the following relationship is satisfied between 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: 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 to guarantee 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 also avoiding molding defects caused by the second lens being too thick or too thin.

[0070] In some alternative embodiments, the following relationship is satisfied between 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: 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 a gap.

[0071] In some alternative embodiments, the spacing distance EP23 in the optical axis direction between the image side surface of the second spacer element and the object side surface of the third spacer element, and the effective focal length f3 of the third lens satisfy: -10.40 < f3 / EP23 < -6.85. By constraining 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. Meanwhile, constraining 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 alternative embodiments, the air spacing T34 between the third lens and the fourth lens on the optical axis and the air spacing T23 between the second lens and the third lens on the optical axis satisfy: 14.95 < T34 / T23 < 20.68. The spacing distance EP23 in the optical axis direction between the image side surface of the second spacer element and the object side surface of the third spacer element, and the effective focal length f3 of the third lens satisfy: -10.40 < f3 / EP23 < -6.85. By constraining T34, T23, f3, and EP23, the smooth transmission of light at the third lens can be ensured, the light with large-angle deflection can be reduced, which is beneficial to reducing the generation of stray light. Meanwhile, the sensitivity of the third lens can be reduced and the assembly stability can be improved.

[0073] In some alternative embodiments, the inner diameter d2m of the image side surface 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 constraining 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 constrained, ensuring the shape of the third lens and reducing the forming difficulty of the third lens.

[0074] In some alternative embodiments, the maximum thickness CP3 of the third spacer element in the optical axis direction and the axial distance SAG41 between the intersection point of the object side surface of the fourth lens and the optical axis and the effective radius vertex of the object side surface of the fourth lens satisfy: 1.25 < SAG41 / CP3 < 5.92. By constraining 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. Meanwhile, constraining 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 alternative embodiments, the inner diameter of the object side surface of the second spacer element is greater than the inner diameter of the object side surface 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 miniaturize the optical imaging lens.

[0076] In some alternative 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 in partial contact with 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: -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 miniaturize 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 balance the aberration of the optical imaging lens and improve the imaging quality.

[0077] In some alternative 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 in partial contact with the image side surface of the first lens. The inner diameter of the object side surface of the first spacer element is greater than the inner diameter of the object side surface of the second spacer element. The spacing 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. The inner diameter of the object side surface of the first spacer element being greater than the inner diameter of the object side surface 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 overall second lens, reduce the molding difficulty and sensitivity of the second lens, and ensure the stability of the optical performance.

[0078] In some alternative 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 the image-side surface portion 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 alternative 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 the image-side surface portion 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 alternative embodiments, the inner diameter d0s of the object-side end face of the lens barrel and the inner diameter d0m of the image-side end face 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 face and the image-side end face of the lens barrel can be ensured, and the wall thickness uniformity of the whole lens barrel can be guaranteed, which is beneficial to the molding of the lens barrel and the realization of miniaturization. At the same time, in a miniaturized optical imaging lens, the excessive difference in the outer diameters of the lenses can be avoided, which affects the assembly stability.

[0081] In some alternative embodiments, 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. By constraining SAG32 / CP3 within a reasonable range, the third lens can be prevented from being too curved, the molding difficulty of the third lens can be reduced, and at the same time, the thickness of the third spacer element can be constrained to ensure the bearing force of the third spacer element on the front and rear lenses, 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 alternative embodiments, please refer to Figure 20, the optical imaging lens further includes a trapezoidal prism 10, which 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.

[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 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 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 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 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; 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.

[0086] The optical imaging lens of the present application is composed of a lens barrel, four lenses and at least two spacer elements. When 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, when light travels between the third lens and the fourth lens, large-angle light is likely to deflect to the optical structure area of the fourth lens to form stray light. In the present application, by restricting 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 deflection of the third lens to light and the air gap on the optical axis between the third lens and the fourth lens are restricted so that light travels along a preset path, reducing the light with large-angle deflection, and thus reducing the generation of stray light. Controlling the air gap on the optical axis between the third lens and the fourth lens can reduce the sensitivity of the optical imaging lens, which is beneficial to improving the assembly yield of the optical imaging lens. At the same time, by ensuring the thickness of the third spacer element, while reducing the risk of baking deformation of the third spacer element, the problem of stray light formed by reflection of the third spacer element can be controlled.

[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 alternative embodiment, the optical imaging lens includes a lens barrel, 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 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 from the object side to the image side; the spacer element group includes at least 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 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.

[0089] The optical imaging lens of the present application is composed 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 easily introduced into 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 further 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 parameter 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 is composed 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, adjacent lenses or adjacent spacer elements. The optical structure region is also called the 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 should understand that, without departing from the technical solutions claimed in this application, the number of lenses constituting the optical imaging lens can be changed to obtain the various results and advantages described in this specification. For example, although four lenses are described as an example in the embodiments, the optical imaging lens is not limited to including four lenses. If necessary, the optical imaging lens may also include other numbers of lenses.

[0096] Figure 1 A schematic diagram of the dimension marking of an optical imaging lens of this application is shown, Figure 1 in which parameters such as d1m, D1s, d2s, d2m, D2s, d3s, d3m, d0s, d0m, EP12, EP23, CP3, etc. are marked to clearly and intuitively understand the meaning of these parameters. For the convenience of describing the surface shape of the optical imaging lens and specific lenses, these parameters will no longer be shown in the drawings when specific embodiments are described later.

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

[0098] Aberration refers to the phenomenon that there is a deviation between the actual image and the ideal image when the optical imaging lens forms an image due to physical limitations or design defects.

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

[0100] Distortion: Since a lens has different magnifications for different parts of the same object, the image is distorted and warped. This aberration is more obvious at the edges. There are two different manifestations of the distortion phenomenon: when the magnification of the edge part is greater than that of the central part, the straight lines of the image will be concave towards the center, which is called pincushion distortion, also known as positive distortion; when the magnification of the edge part is less than that of the central part, the straight lines of the image will protrude towards the surroundings, which is called barrel distortion, also known as negative distortion.

[0101] Relative illuminance refers to the ability to describe the maximum aperture of an optical imaging lens, that is, the ratio of the maximum incident light quantity to the minimum incident light quantity.

[0102] The following further describes, with reference to the accompanying drawings, examples of the specific surface shapes and parameters of the optical imaging lens applicable to the above-described embodiments.

[0103] It should be noted that in the following Example 1, there are Examples 1-1, 1-2, and 1-3; in Example 2, there are Examples 2-1, 2-2, and 2-3; in Example 3, there are Examples 3-1, 3-2, and 3-3. The curvature radii, central thicknesses, and other parameters of the first lens to the fourth lens of the optical imaging lens, as well as the spacing distances and high-order term coefficients between the lenses, are the same under the three examples in the same embodiment. However, the thicknesses, inner diameters, and outer diameters of the lens barrel, the first spacer element, the second spacer element, and the third spacer element, as well as the shapes of some lenses, are different. Or rather, the main structures for imaging are the same, while the auxiliary structures for imaging are different.

[0104] It should be noted that any of the following Examples 1 to 3 is applicable to all embodiments of the present application.

[0105] Example 1

[0106] As Figures 2 to 8 shown, the optical imaging lens of Example 1 is described. Figure 2 The structural schematic diagram of the optical imaging lens of Example 1-1 is shown, Figure 3 The structural schematic diagram of the optical imaging lens of Example 1-2 is shown, Figure 4 The structural schematic diagram of the optical imaging lens of Example 1-3 is shown.

[0107] As Figures 2 to 4 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 in sequence from the object side to the image side.

[0108] As shown Figure 2 in FIG. 1, it is a schematic structural diagram of the optical imaging lens of Embodiment 1-1. In this embodiment, the object side and the image side of the first spacer element P1 are respectively in partial contact with the image side S2 of the first lens and the object side S3 of the second lens. 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 the image side of the third spacer element P3 are respectively in partial contact with the image side S6 of the third lens and the object side S7 of the fourth lens, and the image side S8 of the fourth lens is in contact with the lens barrel.

[0109] As shown Figure 3 in FIG. 2, it is a schematic structural diagram of the optical imaging lens of Embodiment 1-2. The abutting and contacting manners of each spacer element are the same as those in Embodiment 1-1, and reference can be made to the relevant descriptions in Embodiment 1-1, which will not be elaborated here.

[0110] As shown Figure 4 in FIG. 3, it is a schematic structural diagram of the optical imaging lens of Embodiment 1-3. The abutting and contacting manners of each spacer element are the same as those in Embodiment 1-1, and reference can be made to the relevant descriptions in Embodiment 1-1, which will not be elaborated here.

[0111] In addition, a second auxiliary spacer element can be provided between the second spacer element P2 and the third lens E3 according to actual requirements, and no specific limitation is made 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 a negative optical power, the object side S1 of the first lens is a convex surface, and the image side S2 of the first lens is a concave surface. The second lens E2 has a positive optical power, the object side S3 of the second lens is a convex surface, and the image side S4 of the second lens is a concave surface. The third lens E3 has a negative optical power, the object side S5 of the third lens is a convex surface, and the image side S6 of the third lens is a concave surface. The fourth lens E4 has a positive optical power, the object side S7 of the fourth lens is a convex surface, and the image side S8 of the fourth lens is a concave surface. Among them, OBJ (not shown in the figure) in Table 1 is the object surface of the optical imaging lens, S9 and S10 (not shown in the figure) can be the object side and the image side of the filter or the protective glass, S11 (not shown in the figure) is the imaging surface of the optical imaging lens, STO (not shown in the figure) is the aperture stop, and the aperture stop STO is located on the image side S8 of the fourth lens.

[0114] Table 1 shows the basic structural parameter table of the optical imaging lens of Embodiment 1. Among them, the units of the radius of curvature and the thickness / distance are both millimeters (mm). T in Table 1 is a trapezoidal prism, and the positive number in the thickness represents the distance from the object side to the image side, and the negative number represents the distance from the image side to the object side.

[0115]

[0116] Table 1

[0117] In the first embodiment, the object side and the image side of the second lens E2 to the fourth lens E4 are both aspherical surfaces. The surface shapes of the aspherical lenses can be defined by, but not limited to, the following aspherical formula:

[0118]

[0119] Where x is the sagitta, the distance from the vertex of the aspherical surface when the aspherical surface is at a position with a height of h along the optical axis direction; c is the paraxial curvature of the aspherical surface, c = 1 / R, that is, 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 correction coefficient of the i-th order of the aspherical surface. Table 2 below gives the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20 that can be used for the aspherical surfaces S3 - S8 in the first embodiment.

[0120] Surface 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 Shows the astigmatism curve (also known as the tangential astigmatism curve) of the optical imaging lens in the first embodiment, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 6 Shows the distortion curve of the optical imaging lens in the first embodiment, which represents the distortion magnitude values corresponding to different field angles. Figure 7 Shows the relative illumination curve of the optical imaging lens in the first embodiment, which represents the relative illumination corresponding to different field angles.

[0123] According to Figures 5 to 7 It can be seen that the optical imaging lens given in the first embodiment can achieve good imaging quality.

[0124] Second Embodiment

[0125] As Figures 8 to 13 shown, the optical imaging lens of the second embodiment is described. Figure 8 Shows the schematic structural diagram of the optical imaging lens of Embodiment 2 - 1, Figure 9 Shows the schematic structural diagram of the optical imaging lens of Embodiment 2 - 2, Figure 10 Shows the schematic structural diagram of the optical imaging lens of Embodiment 2 - 3.

[0126] As Figures 8 to 10As shown, the optical imaging lens includes a lens barrel, four lenses, and a plurality of 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 in sequence from the object side to the image side.

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

[0128] As Figure 9 shown, it is a schematic structural diagram of the optical imaging lens of Embodiment 2-2. The abutting and contacting manners of each spacer element are the same as those in Embodiment 2-1. For the relevant descriptions, reference can be made to those in Embodiment 2-1, and details will not be elaborated here.

[0129] As Figure 10 shown, it is a schematic structural diagram of the optical imaging lens of Embodiment 2-3. The abutting and contacting manners of each spacer element are the same as those in Embodiment 2-1. For the relevant descriptions, reference can be made to those in Embodiment 2-1, and details will not be elaborated here.

[0130] In addition, a second auxiliary spacer element can be provided between the second spacer element P2 and the third lens E3 according to actual requirements, and no specific limitation is made here.

[0131] In summary, the structural parameters of the optical imaging lens in 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 a negative optical power. The object side surface S1 of the first lens is a convex surface, and the image side surface S2 of the first lens is a concave surface. The second lens E2 has a positive optical power. The object side surface S3 of the second lens is a convex surface, and the image side surface S4 of the second lens is a convex surface. The third lens E3 has a negative optical power. The object side surface S5 of the third lens is a convex surface, and the image side surface S6 of the third lens is a concave surface. The fourth lens E4 has a positive optical power. The object side surface S7 of the fourth lens is a convex surface, and the image side surface S8 of the fourth lens is a convex surface. Among them, OBJ (not shown in the figure) in Table 3 is the object surface of the optical imaging lens, S9 and S10 (not shown in the figure) can be the object side surface and the image side surface of a filter or a 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. The aperture stop STO is located on the image side surface S8 of the fourth lens.

[0133] Table 3 shows the basic structural parameter table of the optical imaging lens of the second embodiment. Among them, the unit of the radius of curvature and the thickness / distance is millimeter (mm). T in Table 3 is a trapezoidal prism. A positive number in the thickness indicates the distance from the object side to the image side, and a negative number indicates the distance from the image side to the object side.

[0134]

[0135] Table 3

[0136] The following Table 4 gives the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20 of the aspherical mirrors S3 - S8 in the second embodiment. Among them, each aspherical surface type can be defined by the formula (1) given in the first embodiment above.

[0137] Surface 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 shows the astigmatism curve (also known as the tangential astigmatism curve) of the optical imaging lens of the second embodiment, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 12 shows the distortion curve of the optical imaging lens of the second embodiment, which represents the distortion magnitude values corresponding to different field angles. Figure 13 shows the relative illumination curve of the optical imaging lens of the second embodiment, which represents the relative illumination corresponding to different field angles.

[0140] According to Figures 11 to 13 it can be known that the optical imaging lens given in the second embodiment can achieve good imaging quality.

[0141] Embodiment Three

[0142] As Figures 14 to 19 shown, the optical imaging lens of the third embodiment is described. Figure 14 shows the structural schematic diagram of the optical imaging lens of Embodiment 3 - 1, Figure 15 shows the structural schematic diagram of the optical imaging lens of Embodiment 3 - 2, Figure 16 shows the structural schematic diagram of the optical imaging lens of Embodiment 3 - 3.

[0143] As Figures 14 to 16 shown, the optical imaging lens includes a lens barrel, four lenses and a plurality of 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 in sequence from the object side to the image side.

[0144] As Figure 14As shown, it is a schematic structural diagram of the optical imaging lens of Embodiment 3-1. In this embodiment, the object side and the 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 the 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 the 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.

[0145] As Figure 15 shown, it is a schematic structural diagram of the optical imaging lens of Embodiment 3-2. The bearing and abutting manners of each spacer element are the same as those in Embodiment 3-1. For the relevant descriptions, reference can be made to Embodiment 3-1, and no further elaboration will be provided here.

[0146] As Figure 16 shown, it is a schematic structural diagram of the optical imaging lens of Embodiment 3-3. The bearing and abutting manners of each spacer element are the same as those in Embodiment 3-1. For the relevant descriptions, reference can be made to Embodiment 3-1, and no further elaboration will be provided here.

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

[0148] In Embodiment 3, the first lens E1 has a negative optical power. The object side S1 of the first lens is convex, and the image side S2 of the first lens is concave. The second lens E2 has a positive optical power. The object side S3 of the second lens is convex, and the image side S4 of the second lens is concave. The third lens E3 has a negative optical power. The object side S5 of the third lens is convex, and the image side S6 of the third lens is concave. The fourth lens E4 has a positive optical power. The object side S7 of the fourth lens is convex, and the image side S8 of the fourth lens is convex. Among them, OBJ (not shown in the figure) in Table 5 is the object surface of the optical imaging lens, S9 and S10 (not shown in the figure) can be the object side and the image side of the filter or the 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. The aperture stop STO is located on the image side S8 of the fourth lens.

[0149] Table 5 shows the basic structural parameter table of the optical imaging lens in Embodiment 3. Among them, the unit of the radius of curvature and the thickness / distance is millimeter (mm). T in Table 5 is a trapezoidal prism. The positive number in the thickness represents the distance from the object side to the image side, and the negative number represents the distance from the image side to the object side.

[0150]

[0151]

[0152] Table 5

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

[0154] Surface 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 Shows the astigmatism curve (also known as the astigmatic curve) of the optical imaging lens in Example 3, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 18 Shows the distortion curve of the optical imaging lens in Example 3, which represents the distortion magnitude values corresponding to different field angles. Figure 19 Shows the relative illumination curve of the optical imaging lens in Example 3, which represents the relative illumination corresponding to different field 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 in Examples 1 to 3 respectively satisfy the relationships shown in Table 7.

[0159]

[0160]

[0161] Table 7 Table 8 shows some parameters (unit: millimeter mm) of the optical imaging lenses in Examples 1 to 3.

[0162] Parameter / Example 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, and its electronic photosensitive element can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor element (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated on a mobile electronic device such as a mobile phone. This imaging device is equipped with the optical imaging lens described above.

[0165] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the scope of protection of the present invention.

[0166] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should also be understood that when the terms "comprising" and / or "including" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0167] It should be noted that the terms "first", "second", etc. in the description, claims and drawings of the present 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 under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0168] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An optical imaging lens, characterized in that: The invention comprises a lens barrel and a lens group and a spacer element group arranged in the lens barrel, The lens group is composed of four lenses, and 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, which are arranged in sequence from the object side to the image side along the optical axis. Among the air intervals between two adjacent lenses in the lens group on the optical axis, the air interval 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, the second spacer element is located between the second lens and the third lens and contacts the image side surface of the second lens, and the third spacer element is located between the third lens and the fourth lens and contacts the image side surface of the third lens; The inner diameter d3s of the object side of the third spacing 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 spacing element, the inner diameter d2s of the object side surface of the second spacing element, and the effective focal length f3 of the third lens satisfy: -17.90 <f3 / (d2s-d3s)<-7.25。 2. The optical imaging lens according to claim 1, wherein: The air gap T34 between the third lens and the fourth lens on the optical axis and the maximum thickness CP3 of the third spacing element in the direction of the optical axis satisfy the following conditions: 16.20 <T34 / CP3<43.50。 3. The optical imaging lens according to claim 1, wherein: The distance EP23 between the image side surface of the second spacing element and the object side surface of the third spacing element in the direction of the optical axis and the center thickness CT3 of the third lens on the optical axis satisfy: 1.42 <EP23 / CT3<2.40。 4. The optical imaging lens according to claim 1, wherein: The inner diameter d3m of the image side surface of the third spacing 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 spacing element satisfy: 3.00 <R7 / d3m<18.30。 5. The optical imaging lens according to claim 1, wherein: An outer diameter D2s of the object side surface of the second spacer element, an inner diameter d2s of the object side surface of the second spacer element, and a center thickness CT2 of the second lens on the optical axis satisfy the following: 1.10<(D2s-d2s) / CT2<1.

95.

6. The optical imaging lens according to claim 1, wherein: The air interval T34 between the third lens and the fourth lens on the optical axis and the air interval T23 between the second lens and the third lens on the optical axis satisfy the following: 14.95<T34 / T23<20.68; The image side surface of the second spacing element and the object side surface of the third spacing element satisfy the following conditions between the spacing distance EP23 in the optical axis direction and the effective focal length f3 of the third lens: -10.40 <f3 / EP23<-6.85。 7. The optical imaging lens according to claim 1, wherein: 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: 6.62 <d2m / CT3<10.55。 8. The optical imaging lens according to claim 1, wherein: The maximum thickness CP3 of the third spacing element in the direction of the optical axis 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 conditions: 1.25 <SAG41 / CP3<5.92。 9. The optical imaging lens according to claim 1, wherein: The inner diameter of the object side surface of the second spacing element is greater than the inner diameter of the object side surface of the third spacing 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: 2.27 <CT2 / CT3<4.55。 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, the first spacer element is located between the first lens and the second lens and is in contact with the image side surface of the first lens, and 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: -21.25 <f1 / D1s<-19.40。

Images