Optical lens

Abstract

The utility model provides an optical lens. The optical lens comprises a lens barrel, a first lens, a second lens, a third lens and at least one spacing element, the first lens, the second lens and the third lens are arranged in the lens barrel, the at least one spacing element comprises a first spacing element, and the first spacing element is located between the first lens and the second lens and makes contact with the image side face part of the first lens; the inner diameter d0s of the end face, closest to the object side, of the lens cone and the inner diameter d0m of the end face, closest to the image side, of the lens cone meet the condition that d0s / d0m is larger than or equal to 2.12 and smaller than or equal to 2.59. The curvature radius R1 of the object side face of the first lens, the refractive index N1 of the first lens, the outer diameter D1s of the object side face of the first spacing element and the inner diameter d1s of the object side face of the first spacing element meet the following condition:-4.13 < = (R1 * N1) / (D1s-d1s) < = 0.89. The utility model solves the problem of serious stray light caused by the fact that an optical lens in the prior art meets the requirement of a large field of view.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical imaging technical field, specifically, relate to an optical lens. BACKGROUND

[0002] With the continuous progress of science and technology, optical lenses are gradually mounted in various electronic devices, such as mobile phones, tablet computers and notebook computers, as well as industrial cameras, smart cameras, smart Internet of Things devices, robots, unmanned aerial vehicles (UAVs) and intelligent driving systems, etc. Different electronic devices have different requirements for optical lenses. For a part of electronic devices, it is required that the optical lens can capture a wider scene, so the optical lens is required to have a large field of view and high image quality to meet the camera requirements of the electronic device.

[0003] However, the design of a large field of view usually requires a larger object-side opening (the inner diameter of the object-side end of the lens barrel) to capture edge light, ensuring that the light in the entire field of view enters the optical lens sufficiently and uniformly. At the same time, a larger object-side opening provides a larger inner wall area, increasing the opportunity for light to contact the inner wall of the lens barrel, which in turn leads to the generation of stray light, affecting the final imaging quality.

[0004] That is, the optical lens in the prior art has the problem of severe stray light caused by meeting the requirement of a large field of view. SUMMARY

[0005] The main purpose of the utility model is to provide an optical lens to solve the problem of severe stray light caused by meeting the requirement of a large field of view in the prior art.

[0006] In order to achieve the above purpose, according to one aspect of the utility model, an optical lens is provided, which comprises a lens barrel, three lenses and at least one spacing element, the three lenses and the at least one spacing element are arranged in the lens barrel, the three lenses comprise a first lens, a second lens and a third lens arranged in order from the object side to the image side; the at least one spacing element comprises a first spacing element, the first spacing element is located between the first lens and the second lens and in contact with the image side surface of the first lens; wherein the inner diameter d0s of the end surface of the lens barrel closest to the object side and the inner diameter d0m of the end surface of the lens barrel closest to the image side satisfy: 2.12≤d0s / d0m≤2.59; the curvature radius R1 of the object side surface of the first lens, the refractive index N1 of the first lens, the outer diameter D1s of the object side surface of the first spacing element and the inner diameter d1s of the object side surface of the first spacing element satisfy: -4.13≤(R1*N1) / (D1s-d1s)≤0.89.

[0007] According to another aspect of the utility model, still provide a kind of optical lens, including lens barrel, three lenses and at least one spacer element, three lenses and at least one spacer element are arranged in lens barrel, three lenses include the first lens with negative optical power, the second lens with positive optical power and the third lens with positive optical power sequentially arranged from object side to image side;At least one spacer element includes first spacer element, and first spacer element is located between the first lens and the second lens and with the image side surface portion of first lens contact;Wherein, the inner diameter d0s of the end face of lens barrel closest to object side and the inner diameter d0m of the end face of lens barrel closest to image side satisfy: 2.12≤d0s / d0m≤2.59;The curvature radius R2 of the image side surface of first lens, the refractive index N1 of first lens, the inner diameter d1s of the object side surface of first spacer element satisfy: 0.42≤(R2*N1) / d1s≤0.88.

[0008] According to another aspect of the utility model, still provide a kind of optical lens, including lens barrel, three lenses and at least one spacer element, three lenses and at least one spacer element are arranged in lens barrel, three lenses include the first lens with negative optical power, the second lens with positive optical power and the third lens with positive optical power sequentially arranged from object side to image side;At least one spacer element includes first spacer element and second spacer element, and first spacer element is located between the first lens and the second lens and with the image side surface portion of first lens contact, and second spacer element is located between the second lens and the third lens and with the image side surface portion of second lens contact;Wherein, the inner diameter d0s of the end face of lens barrel closest to object side and the inner diameter d2s of the object side surface of second spacer element satisfy: 5.46≤d0s / d2s≤7.49;The curvature radius R2 of the image side surface of first lens, the outer diameter D1s of the object side surface of first spacer element, the curvature radius R3 of the object side surface of second lens, the outer diameter D2s of the object side surface of second spacer element satisfy: 0.5≤R2*D1s / (R3*D2s)≤1.59.

[0009] Further, the outer diameter D0s of the end face of lens barrel closest to object side and the outer diameter D0m of the end face of lens barrel closest to image side satisfy: 1.09≤D0s / D0m≤1.50.

[0010] Further, the outer diameter D1s of the object side surface of first spacer element and the curvature radius R1 of the object side surface of first lens satisfy: -1.33≤D1s / R1≤3.08.

[0011] Further, the curvature radius R2 of the image side surface of first lens, the refractive index N1 of first lens, the inner diameter d1s of the object side surface of first spacer element satisfy: 0.42≤(R2*N1) / d1s≤0.88.

[0012] Further, the air separation T12 of the first lens and the second lens on the optical axis of the optical lens, the on-axis distance SAG21 between the intersection of the object side surface of the second lens and the optical axis and the effective radius vertex of the object side surface of the second lens, the maximum thickness CP1 of the first spacer element satisfy: 0.76≤(T12+CP1) / SAG21≤3.87.

[0013] Further, the central thickness CT1 of the first lens on the optical axis of the optical lens, the central thickness CT2 of the second lens on the optical axis and the central thickness CT3 of the third lens on the optical axis satisfy: 2.78≤(CT2+CT3) / CT1≤4.2.

[0014] Further, the at least one spacer element comprises a second spacer element, the second spacer element is located between the second lens and the third lens and in contact with the image side surface portion of the second lens, wherein the curvature radius R4 of the image side surface of the second lens, the outer diameter D1m of the image side surface of the first spacer element, the curvature radius R3 of the object side surface of the second lens, the outer diameter D2s of the object side surface of the second spacer element satisfy: 1.52≤R4*D1m / (R3*D2s)≤4.14.

[0015] Further, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the inner diameter d2s of the object side surface of the second spacer element, the inner diameter d2m of the image side surface of the second spacer element satisfy: 0.93≤(f2*d2s) / (f3*d2m)≤2.66.

[0016] Further, the separation EP12 between the first spacer element and the second spacer element, the maximum height L of the barrel in the extension direction of the optical axis of the optical lens satisfy: 4.21≤L / EP12≤5.15.

[0017] Further, the air separation T12 of the first lens and the second lens on the optical axis of the optical lens, the air separation T23 of the second lens and the third lens on the optical axis, the maximum thickness CP1 of the first spacer element and the maximum thickness CP2 of the second spacer element satisfy: 0.29≤(T23*CP2) / (T12*CP1)≤1.1.

[0018] Further, the outer diameter D2m of the image side surface of the second spacer element and the curvature radius of the image side surface of the third lens satisfy: -5.06≤D2m / R6≤-3.74.

[0019] Further, the curvature radius R5 of the object side surface of the third lens, the inner diameter d2m of the image side surface of the second spacer element satisfy: 3.02≤R5 / d2m≤6.28.

[0020] Further, the first lens has a negative focal power, the second lens has a positive focal power, and the third lens has a positive focal power.

[0021] Further, the image side surface of the first lens is a concave surface, the object side surface of the second lens is a convex surface, the image side surface of the second lens is a concave surface, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface.

[0022] With the technical scheme of the utility model, the optical lens is composed of a lens barrel, three lenses and at least one spacing element, the inner diameter d0s of the end surface closest to the object side of the lens barrel and the inner diameter d0m of the end surface closest to the image side of the lens barrel satisfy 2.12≤d0s / d0m≤2.59, so that the inner diameter d0s of the end surface closest to the object side of the lens barrel is greater than the inner diameter d0m of the end surface closest to the image side of the lens barrel, the optical lens has a larger object side opening, a wider light inlet is provided, more edge light can enter the optical lens, and the field of view of the optical lens is increased. In addition, the image side opening of the optical lens is small, the optical lens forms an inverted structure, the lens size of the object side end is greater than the lens size of the image side end, the large-size lens of the object side end can more uniformly collect and disperse light, so that the light is relatively gentle when entering the subsequent lens, and the optimization of the light path helps to reduce the severe refraction of the edge light, thereby reducing distortion. However, in this case, when the light enters from the larger object side opening, reflection may occur on the surface of the lens edge and the spacing element, especially at the edge of the first lens, which causes serious stray light. In order to reduce the stray light generated at the edge of the first lens, the present application restricts (R1*N1) / (D1s-d1s) to a reasonable range to adjust the deflection degree of the light passing through the first lens, ensures that the light will not be deflected at a large angle, avoids excessive reflection of the light at the edge of the first lens, reduces the generation of stray light, ensures that the first spacing element can effectively block the area where stray light may be generated, and at the same time does not limit the normal transmission path of the light. BRIEF DESCRIPTION OF DRAWINGS

[0023] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the specification explain the present application. The use of the same reference numbers in different drawings is intended to denote the same or similar elements.

[0024] Figure 1 A size marking diagram of the optical lens of an optional embodiment of the present application is shown;

[0025] Figure 2 A structure schematic view of the optical lens of embodiment 1-1 of the present application is shown;

[0026] Figure 3A structural schematic view of the optical lens of the embodiment 1-2 of the utility model is shown;

[0027] Figures 4 to 7 The on-axis chromatic aberration, astigmatic curve, distortion curve and magnification chromatic aberration curve of the optical lens of the embodiment one of the utility model are respectively shown;

[0028] Figure 8 A structural schematic view of the optical lens of the embodiment 2-1 of the utility model is shown;

[0029] Figure 9 A structural schematic view of the optical lens of the embodiment 2-2 of the utility model is shown;

[0030] Figures 10 to 13 The on-axis chromatic aberration, astigmatic curve, distortion curve and magnification chromatic aberration curve of the optical lens of the embodiment two of the utility model are respectively shown;

[0031] Figure 14 A structural schematic view of the optical lens of the embodiment 3-1 of the utility model is shown;

[0032] Figure 15 A structural schematic view of the optical lens of the embodiment 3-2 of the utility model is shown;

[0033] Figures 16 to 19 The on-axis chromatic aberration, astigmatic curve, distortion curve and magnification chromatic aberration curve of the optical lens of the embodiment three of the utility model are respectively shown;

[0034] Figure 20 A structural schematic view of the optical lens of the embodiment 4-1 of the utility model is shown;

[0035] Figure 21 A structural schematic view of the optical lens of the embodiment 4-2 of the utility model is shown;

[0036] Figures 22 to 25 The on-axis chromatic aberration, astigmatic curve, distortion curve and magnification chromatic aberration curve of the optical lens of the embodiment four of the utility model are respectively shown;

[0037] Figure 26 A light path diagram of the optical lens of an optional embodiment of the utility model is shown;

[0038] Figure 27 A light path diagram of an example optical lens is shown; Figure 26 A stray light schematic diagram of the optical lens is shown;

[0039] Figure 28 A light path diagram of an example optical lens is shown;

[0040] Figure 29 A light path diagram of an example optical lens is shown; Figure 28A stray light schematic diagram of the optical lens;

[0041] Figure 30 A light path diagram of another example optical lens is shown;

[0042] Figure 31 A light path diagram of another example optical lens is shown Figure 30 A stray light schematic diagram of the optical lens;

[0043] Figure 32 A scanning electron microscope diagram of a flange position of a first lens of the optical lens of one optional embodiment of the present application is shown;

[0044] Figure 33 A scanning electron microscope diagram of a flange position of a first lens of one example optical lens is shown.

[0045] Among them, the above drawings include the following reference signs:

[0046] P0, lens barrel; E1, first lens; S1, object side surface of the first lens; S2, image side surface of the first lens; E2, second lens; S3, object side surface of the second lens; S4, image side surface of the second lens; E3, third lens; S5, object side surface of the third lens; S6, image side surface of the third lens; P1, first spacer element; P2, second spacer element. DETAILED DESCRIPTION

[0047] It should be noted that the embodiments and features in the embodiments in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with embodiments.

[0048] It should be noted that, unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0049] In the present application, unless otherwise stated, the orientation words such as "up, down, top, bottom" are generally directed to the directions shown in the drawings, or are directed to the vertical, perpendicular or gravity directions of the components themselves. Similarly, for the convenience of understanding and description, "inner, outer" refers to the inner and outer relative to the contour of each component itself, but the above orientation words are not used to limit the present application.

[0050] It should be noted that in the present 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, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.

[0051] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0052] In this article, the paraxial area refers to the area near the optical axis. If the lens surface is convex and the convex surface position is not defined, it means that the lens surface is convex at least in the paraxial area; if the lens surface is concave and the concave surface position is not defined, it means that the lens surface is concave at least in the paraxial area. The judgment of the surface shape in the paraxial area can be based on the judgment method of ordinary knowledge in this field, and the positive and negative R values ​​(R refers to the radius of curvature of the paraxial area, usually refers to the R value on the lens database (lens data) in the optical software) are used to judge the convexity and concavity. In terms of the object side, when the R value is positive, it is judged to be convex, and when the R value is negative, it is judged to be concave; in terms of the image side, when the R value is positive, it is judged to be concave, and when the R value is negative, it is judged to be convex. In this application, the left side is the object side and the right side is the image side.

[0053] In order to solve the problem in the prior art that optical lenses have a large field of view requirement but cause serious stray light, the utility model provides an optical lens.

[0054] like Figures 1 to 33 As shown, the optical lens includes a lens barrel, three lenses and at least one spacer element, and the three lenses and the at least one spacer element are arranged in the lens barrel, and the three lenses include a first lens, a second lens and a third lens arranged in sequence from the object side to the image side; the at least one spacer element includes a first spacer element, and 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; wherein, the inner diameter d0s of the end face of the lens barrel closest to the object side and the inner diameter d0m of the end face of the lens barrel closest to the image side satisfy: 2.12≤d0s / d0m≤2.59; the curvature radius R1 of the object side surface of the first lens, the refractive index N1 of the first lens, the outer diameter D1s of the object side surface of the first spacer element and the inner diameter d1s of the object side surface of the first spacer element satisfy: -4.13≤(R1*N1) / (D1s-d1s)≤0.89.

[0055] The optical lens of the present application is composed of a lens barrel, three lenses and at least one spacer element, the inner diameter d0sof the end face closest to the object side of the lens barrel and the inner diameter d0mof the end face closest to the image side of the lens barrel satisfy: 2.12≤d0s / d0m≤2.59, so that the inner diameter d0sof the end face closest to the object side of the lens barrel is greater than the inner diameter d0mof the end face closest to the image side of the lens barrel, so that the optical lens has a larger object side opening, providing a wider light entrance, allowing more edge light to enter the optical lens, which is beneficial to increase the field of view of the optical lens. In addition, the image side opening of the optical lens is smaller, so that the optical lens forms an inverted structure, the lens size of the object side end is larger than that of the image side end, and the large size lens of the object side end can more uniformly collect and disperse light, so that the light is relatively gentle when entering the subsequent lens. The optimization of such light path helps to reduce the severe refraction of edge light, thereby reducing distortion. However, in this case, light entering from the larger object side opening may form reflections on the surface of the lens edge and the spacer element, especially at the edge of the first lens, resulting in serious stray light.

[0056] In order to reduce the stray light generated at the edge of the first lens, the present application restricts (R1*N1) / (D1s-d1s) to a reasonable range to adjust the deflection degree of light passing through the first lens, ensures that the light will not produce large angle deflection, avoids the light forming too much reflection at the edge of the first lens, reduces the generation of stray light, and ensures that the first spacer element can effectively block the area where stray light may be generated, while not limiting the normal transmission path of light.

[0057] In addition, by restricting (R1*N1) / (D1s-d1s) to a reasonable range, the shape and size of the first lens are optimized. When the flange position of the first lens is subjected to fogging treatment or other light reduction treatment, the feasibility of the treatment will not be limited by the geometry or size of the lens. The flange position after fogging treatment or other light reduction treatment can further absorb and scatter edge reflected light, thereby reducing stray light. If (R1*N1) / (D1s-d1s) is less than -4.13 or (R1*N1) / (D1s-d1s) is greater than 0.89, the laser processing head is easy to interfere between the mold of the lens or the optical effective area of the lens during the fogging process, affecting the structure or imaging performance of the lens, and then the fogging treatment cannot be performed. Figure 32 For the optical lens satisfying -4.13≤(R1*N1) / (D1s-d1s)≤0.89, the scanning electron microscope image of the flange position of the first lens, the flange position of the first lens is subjected to fogging treatment, and Figure 33This is a SEM image of the flange position of the first lens in an example optical lens. This optical lens does not satisfy -4.13≤(R1*N1) / (D1s-d1s)≤0.89, and the flange position of the first lens cannot be fogged. Therefore, this image can be understood as an enlarged image of the flange position of the first lens without fogging. Figure 32 and Figure 33 From the comparison, it can be seen that the flange position after atomization has more microstructures and greater roughness, which leads to better light absorption.

[0058] The flange position refers to the position where the lens rests against the inner wall of the lens barrel.

[0059] In addition, refer to Table 1 and Figures 26 to 31 As shown, Figure 26 The optical path diagram of the optical lens is shown when d0s / d0m=2.31 and (R1*N1) / (D1s-d1s)=-2.02. Figure 27 for Figure 26 Schematic diagram of stray light in optical lenses. Figure 28 The optical path diagram of the optical lens is shown when d0s / d0m=2.31 and (R1*N1) / (D1s-d1s)=-4.5. Figure 29 for Figure 28 Schematic diagram of stray light in optical lenses. Figure 30 The optical path diagram of the optical lens is shown when d0s / d0m=2.31 and (R1*N1) / (D1s-d1s)=1.0. Figure 31 for Figure 30 Schematic diagram of stray light in optical lenses.

[0060] Depend on Figures 26 to 31 It can be seen that when (R1*N1) / (D1s-d1s) = -2.02, the stray light energy is weakened, the stray light is improved, and the performance is better. When (R1*N1) / (D1s-d1s) = -4.5, the stray light energy is strong, the stray light has a greater impact on the image quality, and the performance is poor. When (R1*N1) / (D1s-d1s) = 1.0, the stray light energy is strong, the stray light has a greater impact on the image quality, and the performance is poor. Therefore, when (R1*N1) / (D1s-d1s) is in the range of -4.13 to 0.89, the optical lens has the best stray light improvement effect. Therefore, the present application reasonably constrains the relationship between the curvature radius of the object side surface of the first lens, the refractive index of the first lens, and the outer diameter and outer diameter of the first spacer element by constraining -4.13≤(R1*N1) / (D1s-d1s)≤0.89, which is beneficial to reducing the stray light generated in the edge area of ​​the first lens, thereby weakening the impact of stray light on imaging quality and ensuring the imaging quality of the optical lens.

[0061]

[0062] Table 1

[0063] It should be noted that the present application limits (R1*N1) / (D1s-d1s) to a reasonable range to control the deflection of light, optimize the size of the lens and spacer element, ensure the machining precision of the parts, and improve the smoothness of the light path to solve the stray light problem when d0s / d0m is in the range of 2.12 to 2.59, especially suitable for VR / AR lens design that requires a large field of view, small optical distortion, and cost control. When (R1*N1) / (D1s-d1s) meets the above range, the purpose of reducing stray light can be achieved, and it does not depend on the power of the lens and the surface shape of the lens, which is further optimized for the optical lens. Each lens can be positive or negative according to the actual design requirements of the optical system, and the surface shape of each lens can be convex or concave according to the design requirements of the optical system. As long as the optical system meets: 2.12≤d0s / d0m≤2.59; -4.13≤(R1*N1) / (D1s-d1s)≤0.89, the purpose of reducing stray light can be achieved.

[0064] For example, the first lens has a negative power, the second lens has a positive power, and the third lens has a positive power. For another example, the image side surface of the first lens is a concave surface; the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the object side surface of the third lens is a convex surface; and the image side surface of the third lens is a convex surface. The optical lens can be simulated by software and / or tools such as ZEMAX, CODEV, etc. Preferably, the optical lens can be simulated by CODEV. In the process of simulation by software and / or tools such as the above, the surface shape of each lens can be simulated according to the surface shape provided by the software and / or tools used and appropriately adjusted.

[0065] In some optional embodiments, the outer diameter D0s of the end surface of the lens barrel closest to the object side and the outer diameter D0m of the end surface of the lens barrel closest to the image side satisfy: 1.09≤D0s / D0m≤1.50. This setting limits the difference between the outer diameters of the two ends of the lens barrel, which helps to ensure the uniformity and strength of the entire lens barrel structure, avoiding the problem of structural instability caused by significant size difference between the two ends of the lens barrel. This is especially important during the assembly and use of the lens, reducing the probability of lens displacement or deformation caused by mechanical stress or thermal stress, thereby maintaining the stability of the imaging quality.

[0066] In addition, the lens barrel in the present application satisfies 2.12≤d0s / d0m≤2.59, 1.09≤D0s / D0m≤1.50 at the same time, which is set to make the size of the end surface of the lens barrel closest to the object side in the radial direction smaller, which is conducive to reducing the risk of stray light generated on the end surface of the lens barrel closest to the object side. At the same time, the size of the end surface of the lens barrel closest to the image side in the radial direction is larger, which is convenient for the optical lens to be installed with other structures.

[0067] In some optional embodiments, the outer diameter D1s of the object side surface of the first spacer element and the radius of curvature R1 of the object side surface of the first lens satisfy: -1.33≤D1s / R1≤3.08. Such a setting can ensure that the radius of curvature of the object side surface of the first lens and the outer diameter of the first spacer element are reasonably matched, avoiding the decline of optical performance such as excessive aberration or stray light due to excessive curvature of the object side surface of the first lens or too small outer diameter of the first spacer element.

[0068] In addition, when D1s / R1 satisfies the above range, the relationship between the outer diameter of the first spacer element and the radius of curvature of the object side surface of the first lens can ensure that the flange surface of the first lens has sufficient width. The flange surface of the first lens is the area where the lens contacts the spacer element or other mechanical structures, such as the lens barrel, and the width of the flange surface directly affects the adsorption range of the lens and the stability during assembly. A sufficiently wide flange surface helps to correctly position and fix the lens during assembly, reduces assembly errors, and improves the assembly yield and overall stability of the optical lens.

[0069] In summary, by adjusting the ratio of D1s / R1, the blocking efficiency between the first spacer element and the first lens can be ensured, the stray light is reduced, and at the same time the good lens forming property and assembly stability are maintained, and finally the purpose of optimizing the overall optical performance of the lens is achieved. In high-demand optical applications such as VR / AR, such precise control is particularly critical, because any minor optical defect can significantly affect the user experience.

[0070] In some optional embodiments, the radius of curvature R2 of the image side surface of the first lens, the refractive index N1 of the first lens, and the inner diameter d1s of the object side surface of the first spacer element satisfy: 0.42≤(R2*N1) / d1s≤0.88. This can optimize the deflection angle of the light rays emitted from the image side surface of the first lens, while ensuring that the first spacer element can effectively control stray light and improve optical quality.

[0071] In some optional embodiments, the air gap T12 of the first lens and the second lens on the optical axis of the optical lens, the on-axis distance SAG21 between the intersection of the object side surface of the second lens and the optical axis and the effective radius vertex of the object side surface of the second lens, and the maximum thickness CP1 of the first spacer element satisfy: 0.76≤(T12+CP1) / SAG21≤3.87. By limiting (T12+CP1) / SAG21 within a reasonable range, the bending degree of the first lens and the second lens can be controlled to ensure the processability of the first lens and the second lens, while limiting the deflection degree of the light between the first lens and the second lens to reduce stray light, and also preventing adverse problems such as lens floating caused by excessive air gap between lenses.

[0072] In some optional embodiments, the center thickness CT1 of the first lens on the optical axis of the optical lens, the center thickness CT2 of the second lens on the optical axis, and the center thickness CT3 of the third lens on the optical axis satisfy: 2.78≤(CT2+CT3) / CT1≤4.2. Field curvature is a common aberration in optical lenses, which is manifested as the central field of view and the edge field of view cannot form clear images at the same time. By controlling the ratio of (CT2+CT3) / CT1, the center thickness of each lens can be reasonably distributed, thereby optimizing the path of light passing through the entire optical system and reducing the fluctuation of field curvature. In this way, objects in the entire field of view can maintain high clarity even at large field angles. In addition, by controlling the ratio of (CT2+CT3) / CT1, the space between lenses can be further reasonably distributed while each lens is shaped, further reducing the fluctuation of field curvature of the optical lens.

[0073] In some optional embodiments, the at least one spacer element includes a second spacer element located between the second lens and the third lens and in contact with the image side surface portion of the second lens, wherein the curvature radius R4 of the image side surface of the second lens, the outer diameter D1m of the image side surface of the first spacer element, the curvature radius R3 of the object side surface of the second lens, and the outer diameter D2s of the object side surface of the second spacer element satisfy: 1.52≤R4*D1m / (R3*D2s)≤4.14. By optimizing the curvature radius of the second lens and the outer diameters of the first spacer element and the second spacer element, the contact width of the second lens with the first spacer element and the second spacer element can be ensured, thereby ensuring the stability of the optical lens assembly, while helping to optimize the light path and reduce distortion when the light beam is transmitted in the second lens, which is conducive to improving the imaging quality of the optical lens.

[0074] In some optional embodiments, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the inner diameter d2s of the object side surface of the second spacer element, and the inner diameter d2m of the image side surface of the second spacer element satisfy: 0.93≤(f2*d2s) / (f3*d2m)≤2.66. The focal length is one of the most important optical parameters of a lens, which determines the effect of light passing through the lens. By controlling the ratio of (f2*d2s) / (f3*d2m) within a reasonable range, the transmission path of light between the second lens and the third lens can be optimized to ensure that the light travels along the preset path, while the limitation on the inner diameter of the second spacer element between the second lens and the third lens ensures that the light smoothly passes through the inner diameter of the second spacer element, and the second spacer element can more effectively block or reduce stray light, further improving the improvement effect of stray light. This is particularly important for high-performance imaging systems in VR / AR applications, as stray light can significantly reduce user experience. In addition, such a setting also matches the focal length between the second lens and the third lens, avoiding imaging deviation or blur caused by mismatched focal length between the two, ensuring consistency and accuracy of imaging.

[0075] In some optional embodiments, the spacing EP12 between the first spacer element and the second spacer element, and the maximum height L of the barrel along the extension direction of the optical axis of the optical lens satisfy: 4.21≤L / EP12≤5.15. By controlling the range of L / EP12, the space between the front and back of the second lens is limited to facilitate the control of the edge thickness of the second lens, which is conducive to the uniformity of the overall thickness of the second lens, reduces the molding problems caused by local over-thickness or under-thickness, and improves the lens quality. At the same time, the overall length of the optical lens is limited, which is conducive to the miniaturization of the optical lens. In VR / AR applications, the miniaturization design of the lens helps to reduce the overall volume and weight of the device, improve the wearing comfort and portability.

[0076] In some optional embodiments, the air spacing T12 of the first lens and the second lens on the optical axis of the optical lens, the air spacing T23 of the second lens and the third lens on the optical axis, the maximum thickness CP1 of the first spacer element, and the maximum thickness CP2 of the second spacer element satisfy: 0.29≤(T23*CP2) / (T12*CP1)≤1.1. By limiting (T23*CP2) / (T12*CP1) within a reasonable range, the profiles of the image side surface of the first lens, the object side surface of the second lens, the image side surface of the second lens, and the object side surface of the third lens can be optimized, and the deflection angle and transmission path of the light between the first lens, the second lens, and the third lens can be optimized, reducing the generation of aberration. At the same time, the light blocking effect of the first spacer element and the second spacer element can also be balanced, reducing the stray light caused by multiple reflections on the lens surface, thereby improving the imaging quality.

[0077] In some optional embodiments, an image-side outer diameter D2m of the second spacing element and a radius of curvature of the image-side surface of the third lens satisfy: -5.06≤D2m / R6≤-3.74. By limiting D2m / R6 within a reasonable range, the convergence point of light rays after the third lens can be optimized to ensure accurate transmission of light rays onto the imaging surface, while ensuring that the flange surface of the third lens has sufficient width. A too-narrow flange surface width can easily cause instability in assembly, and even cause insufficient shading effect to produce stray light, while a too-large flange surface width can block imaging light rays. Such a setting helps to strike a balance between reducing stray light interference and maintaining normal transmission of light rays, thereby improving the imaging quality of the optical lens, especially in large field of view and high contrast scenarios, while ensuring the stability of the third lens assembly and the assembly yield of the optical lens.

[0078] In some optional embodiments, a radius of curvature R5 of the object-side surface of the third lens and an inner diameter d2m of the image-side surface of the second spacing element satisfy: 3.02≤R5 / d2m≤6.28. By limiting R5 / d2m within a reasonable range, it can be ensured that light rays are properly deflected when entering the third lens, while the shading effect of the second spacing element reduces stray light, improving the clarity and contrast of the imaging. If R5 / d2m is too small, the object-side surface of the third lens can be too curved, increasing the difficulty of molding and reducing the assembly stability, while if R5 / d2m is too large, it can affect the imaging quality of the optical lens due to insufficient shading. By limiting R5 / d2m within a reasonable range, the second spacing element effectively blocks stray light passing through the aperture, while the path of light transmission is ensured, thereby improving the imaging quality of the optical lens.

[0079] In addition, in another optional embodiment of the present application, an optical lens is also provided, which comprises a lens barrel, three lenses and at least one spacing element, the three lenses and the at least one spacing element are arranged in the lens barrel, the three lenses comprise a first lens with negative focal power, a second lens with positive focal power and a third lens with positive focal power arranged in sequence from the object side to the image side; the at least one spacing element comprises a first spacing element, the first spacing element is located between the first lens and the second lens and partially contacts the image-side surface of the first lens; wherein the inner diameter d0s of the end surface of the lens barrel closest to the object side and the inner diameter d0m of the end surface of the lens barrel closest to the image side satisfy: 2.12≤d0s / d0m≤2.59; the radius of curvature R2 of the image-side surface of the first lens, the refractive index N1 of the first lens and the inner diameter d1s of the object-side surface of the first spacing element satisfy: 0.42≤(R2*N1) / d1s≤0.88.

[0080] The optical lens of the present application is composed of a lens barrel, three lenses and at least one spacer element. The inner diameter d0sof the end surface of the lens barrel closest to the object side and the inner diameter d0mof the end surface of the lens barrel closest to the image side satisfy: 2.12≤d0s / d0m≤2.59. In this way, the inner diameter d0sof the end surface of the lens barrel closest to the object side is greater than the inner diameter d0mof the end surface of the lens barrel closest to the image side, so that the optical lens has a larger object side opening, providing a wider light entrance, allowing more marginal light to enter the optical lens, which is conducive to increasing the field of view of the optical lens. In addition, the image side opening of the optical lens is smaller, so that the optical lens forms an inverted structure, and the lens size at the object side end is greater than the lens size at the image side end. The large-size lens at the object side end can more uniformly collect and disperse light, so that the light entering the subsequent lens is relatively gentle. This optimization of the light path helps to reduce the severe refraction of marginal light, thereby reducing distortion. However, in this case, the light entering from the larger object side opening may form reflections on the surface of the lens edge and the spacer element, especially at the edge of the first lens, resulting in serious stray light.

[0081] In order to reduce the stray light generated at the edge of the first lens, the present application restricts (R2*N1) / d1s to a reasonable range to adjust the degree of deflection of the light passing through the first lens, optimizes the deflection angle of the light exiting the image side surface of the first lens, and ensures that the light does not produce a large angle deflection, avoids excessive reflection of light at the edge of the first lens, reduces the generation of stray light, and ensures that the first spacer element can effectively block the area where stray light may be generated, while not limiting the normal transmission path of the light.

[0082] In addition, in another optional embodiment of the present application, an optical lens is also provided. The optical lens includes a lens barrel, three lenses and at least one spacer element. The three lenses and the at least one spacer element are arranged in the lens barrel. The three lenses include a first lens with negative focal power, a second lens with positive focal power and a third lens with positive focal power arranged in sequence from the object side to the image side. The at least one spacer element includes a first spacer element and a second spacer element. The first spacer element is located between the first lens and the second lens and partially contacts the image side surface of the first lens. The second spacer element is located between the second lens and the third lens and partially contacts the image side surface of the second lens. The inner diameter d0sof the end surface of the lens barrel closest to the object side and the inner diameter d2sof the object side surface of the second spacer element satisfy: 5.46≤d0s / d2s≤7.49. The curvature radius R2of the image side surface of the first lens, the outer diameter D1sof the object side surface of the first spacer element, the curvature radius R3of the object side surface of the second lens and the outer diameter D2sof the object side surface of the second spacer element satisfy: 0.5≤R2*D1s / (R3*D2s)≤1.59.

[0083] The optical lens of the present application is composed of a lens barrel, three lenses and at least one spacer element. The inner diameter d0s of the end surface closest to the object side of the lens barrel and the inner diameter d2s of the object side surface of the second spacer element satisfy the condition: 5.46≤d0s / d2s≤7.49. When the inner diameter d0s of the end surface closest to the object side of the lens barrel is larger than the inner diameter d2s of the object side surface of the second spacer element, d0s is more than five times d2s, and the light ray needs to pass through a larger convergence when passing through the central hole of the second spacer element from the opening closest to the object side of the lens barrel, the light ray is easily deflected by a larger angle when passing through the first lens and the second lens, and the deflected light ray is easily reflected at the inner wall surface of the lens barrel or the optical structure region of the lens, resulting in serious stray light.

[0084] In order to reduce the stray light generated at the edge of the first lens and the second lens, the present application restricts R2*D1s / (R3*D2s) within a reasonable range to adjust the deflection degree of the light ray when passing through the first lens and the second lens, especially to adjust the deflection degree of the light ray when passing through the object side surface of the first lens and the deflection degree of the light ray when entering the second lens, to optimize the deflection angle of the light ray exiting the image side surface of the first lens and the deflection angle of the light ray entering the object side surface of the second lens, to ensure that the light ray will not be deflected by a large angle, to reduce the generation of stray light, and to ensure that the first spacer element and the second spacer element can effectively shield the area where stray light may be generated, while not limiting the normal transmission path of the light ray.

[0085] In some optional embodiments, at least one cut-edge lens can be included in the above-mentioned multiple lenses. The outer periphery of the cut-edge lens can have a cut-edge portion and a non-cut-edge portion, and the outer diameter of the cut-edge portion of the lens is smaller than the outer diameter of the non-cut-edge portion of the lens. When the outer periphery of the lens has a cut-edge portion, the outer diameter of the lens generally refers to the outer diameter of the non-cut-edge portion of the lens.

[0086] In some optional embodiments, at least one cut-edge spacer element can be included in the above-mentioned multiple spacer elements. The outer periphery of the cut-edge spacer element can have a cut-edge portion and a non-cut-edge portion, and the outer diameter of the cut-edge portion of the cut-edge spacer element is smaller than the outer diameter of the non-cut-edge portion of the cut-edge spacer element. The outer diameter of the spacer element generally refers to the maximum outer diameter of the non-cut-edge portion.

[0087] Of course, other parameter formulas in the above embodiments can also be included in the present embodiment, which will not be described one by one here.

[0088] Optionally, the above-mentioned optical lens can further include a protective glass for protecting the photosensitive element located on the imaging surface.

[0089] The optical lens in the present application can adopt multiple lenses, for example, three lenses as mentioned above. In the present application, at least one of the lens surfaces of each lens is an aspheric lens surface. The aspheric lens has the characteristic that the curvature is continuously changed from the center of the lens to the periphery of the lens. Unlike the spherical lens which has a constant curvature from the center of the lens to the periphery of the lens, the aspheric lens has better curvature radius characteristics, and has the advantages of improving the distortion aberration and improving the astigmatism aberration. After using the aspheric lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality.

[0090] However, those skilled in the art should understand that the number of lenses constituting the optical lens can be changed without departing from the technical solutions claimed by the present application, to obtain the various results and advantages described in the present application. For example, although described in the embodiments by taking three lenses as an example, the optical lens is not limited to including three lenses. If necessary, the optical lens can also include other numbers of lenses.

[0091] Figure 1 The size annotation diagram of one optical lens of the present application is shown, Figure 1 The parameters d1s, d1m, D1s, D1m, d2s, d2m, D2s, D2m, d0s, d0m, D0s, D0m, CP1, CP2, EP12, L, etc. are marked in the figure, so that the meaning of the parameters can be clearly and intuitively understood. In order to facilitate the description of the optical lens and the surface shape of the specific lens, these parameters will not be embodied in the figure when the specific embodiments are described below.

[0092] The specific surface shape and parameters of the optical lens applicable to the above-mentioned embodiments are further described below with reference to the drawings.

[0093] It should be noted that there are two examples of embodiment 1-1 and embodiment 1-2 in the following embodiment one, there are two examples of embodiment 2-1 and embodiment 2-2 in the following embodiment two, there are two examples of embodiment 3-1 and embodiment 3-2 in the following embodiment three, and there are two examples of embodiment 4-1 and embodiment 4-2 in the following embodiment four. The curvature radius, center thickness, etc. of the first lens to the third lens of the optical lens in the two examples in the same embodiment are the same, but the thickness, inner diameter and outer diameter of the lens barrel, the first spacing element and the second spacing element, and the shape of part of the lens are different. Or, the main structure for imaging is the same, and the auxiliary structure for imaging is different.

[0094] It should be noted that any one of the following embodiments one to four is applicable to all embodiments of the present application.

[0095] Embodiment one

[0096] As shown in Figures 2 to 7 , an optical lens of embodiment one is described. Figure 2 A structural schematic diagram of the optical lens of embodiment 1-1 is shown, Figure 3 A structural schematic diagram of the optical lens of embodiment 1-2 is shown.

[0097] As shown in Figure 2 and Figure 3 , the optical lens comprises a lens barrel P0, three lenses and a plurality of spacer elements, the lens barrel P0 comprises, in order from the object side to the image side, a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2 and a third lens E3.

[0098] As shown in Figure 2 , a structural schematic diagram of the optical lens of embodiment 1-1 is shown. In this example, the object side surface S1 of the first lens is arranged apart from the lens barrel P0, and the outer annular surface of the first lens E1 partially abuts the inner wall surface of the lens barrel P0. The object side surface and the image side surface of the first spacer element P1 partially abut the image side surface S2 of the first lens and the object side surface S3 of the second lens, respectively. The object side surface and the image side surface of the second spacer element partially abut the image side surface S4 of the second lens and the object side surface S5 of the third lens, respectively. The image side surface S6 of the third lens partially abuts the lens barrel P0.

[0099] As shown in Figure 3 , a structural schematic diagram of the optical lens of embodiment 1-2 is shown. In this example, the abutting manner of each spacer element is the same as that of embodiment 1-1, and the relevant description in embodiment 1-1 can be referred to, which is not repeated here.

[0100] In summary, the structural parameters of the optical lens of embodiment one under embodiments 1-1 and 1-2 are shown in Table 2. (unit: mm)

[0101] Parameter / Embodiment 1-1 1-2 d1s 0.867 0.882 d1m 0.867 0.841 D1s 2.166 2.154 d2s 0.339 0.358 d2m 0.339 0.318 D2s 1.567 1.766 D2m 1.567 1.766 d0s 2.414 2.428 d0m 0.977 0.960 D0s 2.648 2.770 D0m 1.913 2.356 CP1 0.022 0.022 CP2 0.022 0.022 EP12 0.328 0.345 D1m 2.166 2.154 L 1.382 1.542

[0102] Table 2

[0103] In embodiment one, the object side surface S1 of the first lens is a concave surface, and the image side surface S2 of the first lens is a concave surface. 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 concave surface. 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 convex surface. S7 to S10 in Table 3 below can be the surface of a filter or a protective glass, and S11 is an imaging surface, and STO is a diaphragm, which is not shown in the figure.

[0104] In the embodiment one, the effective focal length f1 of the first lens is -0.42mm, the effective focal length f2 of the second lens is 0.56mm, the effective focal length f3 of the third lens is 0.60mm, and the on-axis distance SAG21 between the intersection of the object side of the second lens and the optical axis and the effective radius vertex of the object side of the second lens is 0.21mm.

[0105] Table 3 shows the basic structure parameter table of the optical lens of the embodiment one, wherein the units of the radius of curvature, thickness / distance are millimeters mm.

[0106]

[0107]

[0108] Table 3

[0109] In the embodiment one, the object side and the image side of the first lens E1 to the third lens E3 are all aspheric surfaces, and the surface type of each aspheric lens can be defined by, but not limited to, the following aspheric formula:

[0110]

[0111] wherein x is the distance sagittal height of the aspheric surface at a height of h along the optical axis direction from the vertex of the aspheric surface; c is the paraxial curvature of the aspheric surface, c = 1 / R, i.e. the paraxial curvature c is the inverse of the radius of curvature R in Table 1 above; k is the conic coefficient; and Ai is the correction coefficient of the i-th order of the aspheric surface. Table 4 below gives the high order coefficient A4, A6, A8, A10, A12, A14, A16, A18 of each aspheric mirror S1-S6 that can be used in the embodiment one.

[0112] Face No. A4 A6 A8 A10 A12 A14 A16 A18 S1 1.38E+00 -5.63E+00 1.97E+01 -5.23E+01 9.76E+01 -1.18E+02 8.33E+01 -2.54E+01 S2 -8.37E+00 8.28E+01 -1.27E+03 1.36E+04 -1.03E+05 4.44E+05 -9.31E+05 6.45E+05 S3 -2.29E+00 3.47E+01 -4.68E+02 5.28E+03 -4.49E+04 1.80E+05 -2.16E+05 0.00E+00 S4 4.85E+00 -1.31E+02 6.06E+03 -1.15E+05 1.42E+06 -2.16E+07 2.94E+08 0.00E+00 S5 7.77E-01 3.86E+00 8.79E+02 -2.32E+04 2.95E+05 -1.88E+06 4.61E+06 0.00E+00 S6 2.38E+00 -4.28E+01 1.06E+03 -1.28E+04 8.67E+04 -2.15E+05 0.00E+00 0.00E+00

[0113] Table 4

[0114] Figure 4 The on-axis chromatic aberration curve of the optical lens of the embodiment one is shown, which represents the convergence focus deviation of light rays of different wavelengths after passing through the optical lens. Figure 5 The astigmatism curve of the optical lens of the embodiment one is shown, which represents the meridional image surface curvature and sagittal image surface curvature. Figure 6 The distortion curve of the optical lens of the embodiment one is shown, which represents the distortion size value corresponding to different field angles. Figure 7 The rate of change of magnification curve of the optical lens of the embodiment one is shown, which represents the deviation of light rays on the imaging surface after passing through the lens at different image heights.

[0115] According to Figures 4 to 7 It can be known that the optical lens given in the embodiment one can achieve good imaging quality.

[0116] Embodiment Two

[0117] As shown in FIG. 2A, an optical lens of Embodiment Two is described. Figures 8 to 13 As shown in FIG. 2A, an optical lens of Embodiment Two is described. Figure 8 As shown in FIG. 2A, an optical lens of Embodiment Two is described. Figure 9 As shown in FIG. 2A, an optical lens of Embodiment Two is described.

[0118] As shown in FIG. 2A, an optical lens of Embodiment Two is described. Figure 8 As shown in FIG. 2A, an optical lens of Embodiment Two is described. Figure 9 As shown in FIG. 2A, an optical lens of Embodiment Two is described.

[0119] As shown in FIG. 2A, an optical lens of Embodiment Two is described. Figure 8 As shown in FIG. 2A, an optical lens of Embodiment Two is described.

[0120] As shown in FIG. 2A, an optical lens of Embodiment Two is described. Figure 9 As shown in FIG. 2A, an optical lens of Embodiment Two is described.

[0121] As shown in FIG. 2A, an optical lens of Embodiment Two is described.

[0122] Parameter / Embodiment 1-1 1-2 d1s 0.771 0.768 d1m 0.771 0.728 D1s 1.720 1.781 d2s 0.352 0.369 d2m 0.352 0.329 D2s 1.329 1.664 D2m 1.329 1.664 d0s 1.995 2.015 d0m 0.939 0.871 D0s 2.332 2.335 D0m 1.762 2.137 CP1 0.022 0.022 CP2 0.022 0.022 EP12 0.283 0.293 D1m 1.720 1.781 L 1.459 1.330

[0123] Table 5

[0124] In Embodiment Two, the object side surface S1 of the first lens is a concave surface, and the image side surface S2 of the first lens is a concave surface. 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 concave surface. 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 convex surface.

[0125] In Embodiment Two, the effective focal length f1 of the first lens is -0.61 mm, the effective focal length f2 of the second lens is 1.10 mm, the effective focal length f3 of the third lens is 0.54 mm, and the on-axis distance SAG21 between the intersection of the object side surface of the second lens and the optical axis and the effective radius vertex of the object side surface of the second lens is 0.15 mm.

[0126] Table 6 shows the basic structure parameter table of the optical lens of Example Two, wherein the units of the radius of curvature, thickness / distance are millimeters (mm).

[0127]

[0128] Table 6

[0129] The following Table 7 gives the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20 of each aspherical surface S1-S6 that can be used in Example Two. Wherein each aspherical surface type can be defined by the formula (1) given in Example One above.

[0130] Face No. A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 5.13E+00 -4.45E+01 2.98E+02 -1.42E+03 4.67E+03 -1.04E+04 1.49E+04 -1.23E+04 4.46E+03 S2 1.26E+01 -1.93E+02 3.17E+03 -5.06E+04 6.29E+05 -5.17E+06 2.52E+07 -6.64E+07 7.39E+07 S3 1.81E+00 -4.47E+01 1.13E+03 -3.25E+04 6.49E+05 -8.35E+06 6.25E+07 -2.46E+08 3.96E+08 S4 3.43E+00 -7.01E+02 7.18E+04 -4.47E+06 1.67E+08 -3.71E+09 4.50E+10 -2.29E+11 0.00E+00 S5 -1.49E+01 4.02E+03 -6.55E+05 6.10E+07 -3.46E+09 1.21E+11 -2.55E+12 2.95E+13 -1.43E+14 S6 8.58E-01 -2.83E+02 1.85E+04 -7.21E+05 1.81E+07 -2.90E+08 2.89E+09 -1.62E+10 3.87E+10

[0131] Table 7

[0132] Figure 10 The on-axis chromatic aberration curve of the optical lens of Example Two is shown, which represents the convergence focus deviation of light rays of different wavelengths after passing through the optical lens. Figure 11 The astigmatism curve of the optical lens of Example Two is shown, which represents the meridional image surface curvature and sagittal image surface curvature. Figure 12 The distortion curve of the optical lens of Example Two is shown, which represents the distortion size values corresponding to different field angles. Figure 13 The lateral chromatic aberration curve of the optical lens of Example Two is shown, which represents the deviation of light rays on the imaging surface after passing through the lens at different image heights.

[0133] According to Figures 10 to 13 It can be seen that the optical lens given in Example Two can achieve good imaging quality.

[0134] Example Three

[0135] As Figures 14 to 19 shown, the optical lens of Example Three is described. Figure 14 The structural schematic diagram of the optical lens of Example 3-1 is shown, Figure 15 The structural schematic diagram of the optical lens of Example 3-2 is shown.

[0136] As Figure 14 and Figure 15 The optical lens includes a lens barrel P0, three lenses and a plurality of spacer elements, the lens barrel P0 includes, in order from the object side to the image side, a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2 and a third lens E3.

[0137] As Figure 14Fig. 3-1 shows a schematic diagram of the structure of the optical lens of Example 3-1. In this example, the object side S1 of the first lens is spaced apart from the lens barrel PO, and the outer circumferential surface of the first lens E1 partially abuts the inner wall surface of the lens barrel PO. The object side and the image side of the first spacer element PI partially abut 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 partially abut the image side S4 of the second lens and the object side S5 of the third lens, respectively. The image side S6 of the third lens partially abuts the lens barrel PO.

[0138] As shown in Fig. 3-2, a schematic diagram of the structure of the optical lens of Example 3-2 is shown. In this example, the abutting mode of each spacer element is the same as that of Example 3-1, and the relevant description in Example 3-1 can be referred to, which will not be repeated here. Figure 15

[0139] In summary, the structure parameters of the optical lens of Example Three under Example 3-1 and Example 3-2 are shown in Table 8 (unit: mm).

[0140] Parameter / Embodiment 1-1 1-2 d1s 0.810 0.855 d1m 0.810 0.815 D1s 2.123 2.164 d2s 0.342 0.372 d2m 0.342 0.332 D2s 1.836 1.574 D2m 1.836 1.574 d0s 2.560 2.393 d0m 1.072 0.963 D0s 2.999 2.703 D0m 2.492 1.980 CP1 0.022 0.022 CP2 0.022 0.022 EP12 0.328 0.343 D1m 2.123 2.164 L 1.579 1.514

[0141] Table 8

[0142] In Example Three, the object side S1 of the first lens is convex, and the image side S2 of the first lens is concave. The object side S3 of the second lens is convex, and the image side S4 of the second lens is concave. The object side S5 of the third lens is convex, and the image side S6 of the third lens is convex.

[0143] In Example Three, the effective focal length f1 of the first lens is -0.80 mm, the effective focal length f2 of the second lens is 1.38 mm, the effective focal length f3 of the third lens is 0.61 mm, and the on-axis distance SAG21 between the intersection of the object side of the second lens and the optical axis and the effective radius vertex of the object side of the second lens is 0.10 mm.

[0144] Table 9 shows the basic structure parameter table of the optical lens of Example Three, wherein the units of the curvature radius and the thickness / distance are millimeters (mm).

[0145]

[0146]

[0147] Table 9

[0148] The following Table 10 gives the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20 of the aspherical surfaces S1-S6 that can be used in Example Three. Wherein, each aspherical surface can be defined by the formula (1) given in the above Example One. ​

[0149] Face No. A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 1.55E-01 -7.45E+00 2.56E+01 -1.95E+01 -1.87E+02 8.22E+02 -1.61E+03 1.61E+03 -6.71E+02 S2 3.68E+00 -9.57E+01 8.32E+02 -3.95E+03 -3.78E+04 7.44E+05 -5.39E+06 1.91E+07 -2.71E+07 S3 7.15E-01 -3.67E+01 1.36E+03 -4.12E+04 7.50E+05 -8.51E+06 5.79E+07 -2.14E+08 3.29E+08 S4 4.56E+00 -6.92E+02 5.86E+04 -2.10E+06 -2.12E+07 4.52E+09 -1.60E+11 2.50E+12 -1.52E+13 S5 -1.10E+00 1.70E+02 -1.50E+04 9.26E+05 -3.42E+07 7.63E+08 -1.01E+10 7.36E+10 -2.25E+11 S6 1.83E+00 -2.29E+02 1.23E+04 -3.97E+05 8.10E+06 -1.04E+08 8.28E+08 -3.68E+09 7.01E+09

[0150] Table 10

[0151] Figure 16 An axial chromatic aberration curve of the optical lens of Example Three is shown, which represents the convergence point deviation of light rays of different wavelengths after passing through the optical lens. Figure 17 An astigmatism curve of the optical lens of Example Three is shown, which represents the meridional image curvature and sagittal image curvature. Figure 18 A distortion curve of the optical lens of Example Three is shown, which represents the distortion size values corresponding to different field angles. Figure 19 A lateral chromatic aberration curve of the optical lens of Example Three is shown, which represents the deviation of light rays on the imaging plane after passing through the lens at different image heights.

[0152] According to Figures 16 to 19 It can be known that the optical lens provided in Example Three can achieve good imaging quality.

[0153] Example Four

[0154] As Figures 20 to 25 shown, the optical lens of Example Four is described. Figure 20 A structural schematic diagram of the optical lens of Example 4-1 is shown, Figure 21 A structural schematic diagram of the optical lens of Example 4-2 is shown.

[0155] As Figure 20 and Figure 21 shown, the optical lens includes a lens barrel P0, three lenses and a plurality of spacer elements, the lens barrel P0 includes, in order from the object side to the image side, a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2 and a third lens E3.

[0156] As Figure 20 shown, it is a structural schematic diagram of the optical lens of Example 4-1. In this example, the object side surface S1 of the first lens is arranged apart from the lens barrel P0, and the outer annular surface of the first lens E1 partially abuts the inner wall surface of the lens barrel P0. The object side surface and the image side surface of the first spacer element P1 partially abut the image side surface S2 of the first lens and the object side surface S3 of the second lens, respectively. The object side surface and the image side surface of the second spacer element partially abut the image side surface S4 of the second lens and the object side surface S5 of the third lens, respectively. The image side surface S6 of the third lens partially abuts the lens barrel P0.

[0157] As Figure 21 shown, it is a structural schematic diagram of the optical lens of Example 4-2. In this example, the abutting abutment mode of each spacer element is the same as that of Example 4-1, and the related description in Example 4-1 can be referred to, which will not be described here.

[0158] The structure parameters of the optical lens in Example Four under Example 4-1 and Example 4-2 are shown in Table 11. (unit: mm)

[0159] Parameter / Embodiment 4-2 4-3 d1s 0.816 0.818 d1m 0.816 0.778 D1s 2.137 2.128 d2s 0.350 0.378 d2m 0.350 0.338 D2s 1.686 1.486 D2m 1.686 1.486 d0s 2.444 2.420 d0m 1.006 0.933 D0s 2.946 2.851 D0m 2.245 1.905 CP1 0.022 0.022 CP2 0.022 0.022 EP12 0.345 0.335 D1m 2.137 2.128 L 1.555 1.553

[0160] Table 11

[0161] In Example Four, the object side S1 of the first lens is convex, the image side S2 of the first lens is concave. The object side S3 of the second lens is convex, the image side S4 of the second lens is concave. The object side S5 of the third lens is convex, the image side S6 of the third lens is convex.

[0162] In Example Four, the effective focal length f1 of the first lens is -0.77mm, the effective focal length f2 of the second lens is 1.41mm, the effective focal length f3 of the third lens is 0.59mm, the on-axis distance SAG21 between the intersection of the object side of the second lens and the optical axis and the effective radius vertex of the object side of the second lens is 0.10mm.

[0163] Table 12 shows the basic structure parameter table of the optical lens in Example Four, wherein the units of the curvature radius, thickness / distance are all millimeters mm.

[0164]

[0165]

[0166] Table 12

[0167] The following Table 13 gives the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20 of the aspherical surfaces S1-S6 that can be used in Example Four. Wherein each aspherical surface type can be defined by the formula (1) given in the above Example One.

[0168] Face No. A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 7.69E-01 -1.10E+01 5.08E+01 -1.58E+02 3.35E+02 -4.51E+02 3.26E+02 -6.65E+01 -3.38E+01 S2 5.38E+00 -1.12E+02 1.02E+03 -6.88E+03 2.45E+04 -3.53E+04 0.00E+00 0.00E+00 0.00E+00 S3 3.32E-01 -1.08E+01 2.37E+00 -8.73E+02 8.68E+03 -2.03E+04 0.00E+00 0.00E+00 0.00E+00 S4 5.41E+00 -6.57E+02 5.19E+04 -2.09E+06 4.18E+07 -3.19E+08 0.00E+00 0.00E+00 0.00E+00 S5 -3.32E-01 5.70E+01 -1.99E+03 9.22E+04 -2.21E+06 2.53E+07 -1.11E+08 0.00E+00 0.00E+00 S6 1.43E+00 -1.36E+02 5.00E+03 -1.01E+05 1.17E+06 -6.99E+06 1.72E+07 0.00E+00 0.00E+00

[0169] Table 13

[0170] Figure 22 The on-axis chromatic aberration curve of the optical lens in Example Four is shown, which represents the convergence focus deviation of light rays of different wavelengths after passing through the optical lens. Figure 23 The astigmatism curve of the optical lens in Example Four is shown, which represents the meridional image surface curvature and sagittal image surface curvature. Figure 24 The distortion curve of the optical lens in Example Four is shown, which represents the distortion size value corresponding to different field angles. Figure 25 The rate of change of the optical lens in Example Four is shown, which represents the deviation of light rays on the imaging plane after passing through the lens.

[0171] According to Figures 22 to 25 It can be seen that the optical lens given in Embodiment Four can achieve good imaging quality.

[0172] In summary, the optical lenses of Embodiments One to Four respectively satisfy the relationships shown in Table 14.

[0173]

[0174]

[0175] Table 14

[0176] Table 15 shows the effective focal length (unit: mm) of each lens of the optical lenses of Embodiments One to Four.

[0177] Parameter / Embodiment One Two Three Four f1 -0.42 -0.61 -0.80 -0.77 f2 0.56 1.10 1.38 1.41 f3 0.60 0.54 0.61 0.59 SAG21 0.21 0.15 0.10 0.10

[0178] Table 15

[0179] The present application also provides an imaging device, the electronic photosensitive element of which can be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The imaging device can be a stand-alone imaging apparatus such as a digital camera, or an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical lens described above.

[0180] Obviously, the above-described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work should belong to the protection scope of the present application.

[0181] It should be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that, when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, work, device, component and / or combination thereof.

[0182] It should be noted that the terms "first", "second", and the like used in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the data used in this way 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.

[0183] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An optical lens, characterized in that: The lens barrel comprises a lens barrel, three lenses and at least one spacer element, wherein the three lenses and the at least one spacer element are arranged in the lens barrel, The three lenses include a first lens, a second lens and a third lens arranged in sequence from the object side to the image side; The at least one spacer element includes a first spacer element positioned between the first lens and the second lens and in contact with an image-side surface portion of the first lens; The inner diameter d0s of the end face of the lens barrel closest to the object side is equal to the inner diameter d0s of the end face of the lens barrel closest to the image side. d0m satisfies: 2.12≤d0s / d0m≤2.59; The curvature radius R1 of the object-side surface of the first lens, the refractive index N1 of the first lens, the outer diameter D1s of the object-side surface of the first spacer element, and the inner diameter d1s of the object-side surface of the first spacer element satisfy the following relationship: -4.13≤(R1*N1) / (D1s-d1s)≤0.

89.

2. The optical lens according to claim 1, wherein: An outer diameter D0s of an end surface of the lens barrel closest to the object side and an outer diameter D0m of an end surface of the lens barrel closest to the image side satisfy the following relationship: 1.09≤D0s / D0m≤1.

50.

3. The optical lens according to claim 1, wherein: An outer diameter D1s of the object-side surface of the first spacer element and a curvature radius R1 of the object-side surface of the first lens satisfy the following relationship: -1.33≤D1s / R1≤3.

08.

4. The optical lens according to claim 1, wherein: The curvature radius R2 of the image-side surface of the first lens, the refractive index N1 of the first lens, and the inner diameter d1s of the object-side surface of the first spacer element satisfy the following: 0.42≤(R2*N1) / d1s≤0.

88.

5. The optical lens according to claim 1, wherein: The air gap T12 between the first lens and the second lens on the optical axis of the optical lens, the on-axis distance SAG21 between the intersection of the object side surface of the second lens and the optical axis and the effective radius vertex of the object side surface of the second lens, and the maximum thickness CP1 of the first spacer element satisfy the following: 0.76≤(T12+CP1) / SAG21≤3.

87.

6. The optical lens according to claim 1, wherein: A center thickness CT1 of the first lens on the optical axis of the optical lens, a center thickness CT2 of the second lens on the optical axis, and a center thickness CT3 of the third lens on the optical axis satisfy the following: 2.78≤(CT2+CT3) / CT1≤4.

2.

7. The optical lens according to claim 1, wherein: The at least one spacer element further includes a second spacer element, the second spacer element being located between the second lens and the third lens and in contact with the image-side surface of the second lens, Among them, the curvature radius R4 of the image side surface of the second lens, the outer diameter D1m of the image side surface of the first spacer element, the curvature radius R3 of the object side surface of the second lens, and the outer diameter D2s of the object side surface of the second spacer element satisfy the following relationship: 1.52≤R4*D1m / (R3*D2s)≤4.

14.

8. The optical lens according to claim 7, wherein: The effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the inner diameter d2s of the object side surface of the second spacer element, and the inner diameter d2m of the image side surface of the second spacer element satisfy the following: 0.93≤(f2*d2s) / (f3*d2m)≤2.

67.

9. The optical lens according to claim 7, wherein: The interval EP12 between the first spacing element and the second spacing element and the maximum height L of the lens barrel along the extension direction of the optical axis of the optical lens satisfy the following: 4.21≤L / EP12≤5.

15.

10. The optical lens according to claim 7, wherein: The air gap T12 between the first lens and the second lens on the optical axis of the optical lens, the air gap T23 between the second lens and the third lens on the optical axis, the maximum thickness CP1 of the first spacer element and the maximum thickness CP2 of the second spacer element satisfy the following: 0.29≤(T23*CP2) / (T12*CP1)≤1.

1.

11. The optical lens according to claim 7, wherein: An outer diameter D2m of the image-side surface of the second spacer element and a curvature radius of the image-side surface of the third lens satisfy the following relationship: -5.06≤D2m / R6≤-3.

74.

12. The optical lens according to claim 7, wherein: A curvature radius R5 of the object-side surface of the third lens and an inner diameter d2m of the image-side surface of the second spacer element satisfy the following: 3.02≤R5 / d2m≤6.

28.

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

14. The optical lens according to any one of claims 1 to 12, characterized in that: The image side surface of the first lens is concave; The object-side surface of the second lens is convex, and the image-side surface of the second lens is concave; The object-side surface of the third lens is a convex surface; the image-side surface of the third lens is a convex surface.

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