Optical lens

Abstract

The utility model provides an optical lens, which comprises a lens barrel, a lens group and a spacing element group, the lens group and the spacing element group are assembled in the lens barrel, the spacing element group at least comprises a first spacing element and a second spacing element, and the first spacing element is positioned between a first lens and a second lens and is in partial contact with the image side surface of the first lens. The second spacing element is positioned between the second lens and the third lens and is in contact with the image side surface part of the second lens; the maximum height L of the lens cone and the effective focal length f of the optical lens meet the following conditions: 2.44 lt; l / flt; 3.15, 3.15; the effective focal length f2 of the second lens, the spacing distance EP12 between the first spacing element and the second spacing element in the direction of the optical axis, and the center thickness CT2 of the second lens meet the following conditions: 2.90 mm <-1 > lt; (CT2 / EP12) / f2lt; 6.56 mm <-1 >. According to the utility model, the problem that miniaturization and assembly stability of an optical lens in the prior art are difficult to consider at the same time is solved.

Description

TECHNICAL FIELD

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

[0002] With the rapid progress of science and technology, the frequency of using electronic products in different places and different scenes is gradually improved, and the requirements of users for electronic products are developing towards portability while considering better imaging quality, which requires electronic products to be more lightweight and small, and the optical lens mounted on the electronic products also develops towards lightweight and small size while ensuring imaging quality. However, the existing optical lens gradually develops towards line miniaturization, but this leads to small internal space of the optical lens, and the lens located in the rear position of the optical lens is under great stress, and the lens located in the rear position is prone to breakage during assembly, and the lens is also prone to tilt after assembly.

[0003] That is, the optical lens in the prior art has the problem that miniaturization and assembly stability are difficult to balance. SUMMARY

[0004] The main purpose of the utility model is to provide an optical lens to solve the problem that the optical lens in the prior art has the problem that miniaturization and assembly stability are difficult to balance.

[0005] 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, a lens group and a spacer element group assembled in the lens barrel, the lens group comprises a first lens, a second lens and a third lens in sequence from the object side to the image side along the optical axis, wherein the second lens has a positive focal length, the center thickness of the second lens is greater than the center thickness of the first lens, and the center thickness of the second lens is greater than the center thickness of the third lens; the spacer element group comprises at least a first spacer element and a second spacer element, the first spacer element is located between the first lens and the second lens and contacts the image side surface of the first lens, and the second spacer element is located between the second lens and the third lens and contacts the image side surface of the second lens; the maximum height L of the lens barrel and the effective focal length f of the optical lens satisfy: 2.44 -1 <(CT2 / EP12) / f2<6.56mm -1 .

[0006] According to another aspect of the utility model, provide a kind of optical lens, optical lens includes lens barrel and the lens group and spacer element group assembled in lens barrel, lens group includes first lens, second lens and third lens in order from object side to image side along optical axis, wherein, second lens has positive focal power;Spacer element group at least includes first spacer element, second spacer element and third spacer element, first spacer element is located between first lens and second lens and with the image side part of first lens contact, second spacer element is located between second lens and third lens and with the image side part of second lens contact, third spacer element is located in the image side of third lens, and third spacer element with the image side part of third lens contact, the maximum height L of lens barrel, the effective focal length f of optical lens satisfy between 2.44 < L / f < 3.15;The distance Dr2r5 on the optical axis between the image side of first lens and the object side of third lens, the interval distance EP12 in the direction of optical axis of first spacer element and second spacer element, the center thickness CT3 of third lens, the interval distance EP23 in the direction of optical axis of second spacer element and third spacer element satisfy 2.6 < Dr2r5 / EP12+CT3 / EP23 < 3.45.

[0007] According to another aspect of the utility model, provide a kind of optical lens, optical lens includes lens barrel and the lens group and spacer element group assembled in lens barrel, lens group includes first lens, second lens and third lens in order from object side to image side along optical axis, wherein, second lens has positive focal power, the image side of first lens is concave, the image side of second lens is convex, the object side of third lens is convex, the image side of third lens is concave;Spacer element group at least includes first spacer element and second spacer element, first spacer element is located between first lens and second lens and with the image side part of first lens contact, second spacer element is located between second lens and third lens and with the image side part of second lens contact, the interval distance EP12 in the direction of optical axis of first spacer element and second spacer element, the center thickness CT2 of second lens satisfy 1.25 < CT2 / EP12 < 1.85;The curvature radius R3 of the object side of second lens, the curvature radius R4 of the image side of second lens, the inner diameter d1m of the image side of first spacer element, the inner diameter d2s of the object side of second spacer element satisfy 0.9 < (|R3|+|R4|) / (d2s+d1m) < 2.75.

[0008] Further, the outer circumferential surface of the lens barrel has a convex structure, the maximum outer diameter Y of the convex structure satisfies: 3.1 mm < Y < 3.4 mm.

[0009] Further, a distance EP12 between the first spacer element and the second spacer element in the optical axis direction, a center thickness CT2 of the second lens, and an inner diameter d2m of the image side surface of the second spacer element satisfy: 1.05 < EP12 / CT2 / d2m < 1.75 mm. -1 <EP12 / CT2 / d2m < 1.75 mm -1 .

[0010] Further, a radius of curvature R2 of the image side surface of the first lens, a radius of curvature R3 of the object side surface of the second lens, and an inner diameter d2s of the object side surface of the second spacer element satisfy: 1.25 < (R2+R3) / d2s < 4.20.

[0011] Further, an inner diameter d2m of the image side surface of the second spacer element, an outer diameter D2m of the image side surface of the second spacer element, and an inner diameter d1s of the object side surface of the first spacer element satisfy: 2.0 < (D2m-d1s) / d2m < 3.45.

[0012] Further, the spacer element group further comprises a third spacer element, the third spacer element is located on the image side of the third lens, and the third spacer element is partially in contact with the image side surface of the third lens, a center thickness CT2 of the second lens, a center thickness CT3 of the third lens, and a center thickness CT1 of the first lens satisfy: 0.70 < CT2 / (CT3+CT1) < 1.45; a distance EP12 between the first spacer element and the second spacer element in the optical axis direction, a distance EP01 between the object side end surface of the lens barrel and the object side surface of the first spacer element in the optical axis direction, and a distance EP23 between the second spacer element and the third spacer element in the optical axis direction satisfy: 0.25 < EP12 / (EP01+EP23) < 0.5.

[0013] Further, an inner diameter d2s of the object side surface of the second spacer element, an outer diameter D2m of the image side surface of the second spacer element, an outer diameter D1m of the image side surface of the first spacer element, and an inner diameter d1s of the object side surface of the first spacer element satisfy: 2.10 < D2m / D1m+d2s / d1s < 3.80.

[0014] Further, an effective focal length f of the optical lens, a half of the maximum field angle Semi-FOV of the optical lens, and a maximum height L of the lens barrel satisfy: 0.25 < f*tan(Semi-FOV) / L < 0.55.

[0015] Further, the spacer element group further comprises a third spacer element, the third spacer element is located on the image side of the third lens, and the third spacer element is partially in contact with the image side surface of the third lens, the distance EP23 in the optical axis direction between the second spacer element and the third spacer element, the outer diameter D2m of the image side surface of the second spacer element, and the inner diameter d2m of the image side surface of the second spacer element satisfy: 0.10 < EP23 / (D2m-d2m) < 0.28.

[0016] Further, the spacer element group further comprises a third spacer element, the third spacer element is located on the image side of the third lens, and the third spacer element is partially in contact with the image side surface of the third lens, the distance EP23 in the optical axis direction between the second spacer element and the third spacer element, the outer diameter D2m of the image side surface of the second spacer element, and the inner diameter d2m of the image side surface of the second spacer element satisfy: 0.10 < EP23 / (D2m-d2m) < 0.28.

[0017] Further, the distance EP01 in the optical axis direction between the object side end surface of the lens barrel and the object side surface of the first spacer element, the distance SG11 along the optical axis from the intersection point of the object side surface of the first lens and the optical axis to the object side surface of the structural region of the first lens, and the central thickness CT1 of the first lens satisfy: 0.75 < EP01 / (SG11+CT1) < 2.50.

[0018] Further, the distance SG11 along the optical axis from the intersection point of the object side surface of the first lens and the optical axis to the object side surface of the structural region of the first lens, the central thickness CT1 of the first lens, and the central thickness CT2 of the second lens satisfy: 1.65 < (SG11+CT2) / CT1 < 3.30.

[0019] Further, the image side surface of the first lens is a concave surface; the image side surface of the second lens is a convex surface; the object side surface of the third lens is a convex surface, the image side surface of the third lens is a concave surface, and the image side surface of the third lens has an inflection point.

[0020] The technical scheme is applied to the optical lens, the optical lens comprises a lens barrel, a lens group and a spacer element group assembled in the lens barrel, the lens group comprises a first lens, a second lens and a third lens from the object side to the image side along the optical axis, the second lens has a positive focal length, the central thickness of the second lens is greater than the central thickness of the first lens, and the central thickness of the second lens is greater than the central thickness of the third lens; the spacer element group comprises at least 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 in contact with the image side surface of the first lens, the second spacer element is located between the second lens and the third lens and partially in contact with the image side surface of the second lens; the maximum height L of the lens barrel and the effective focal length f of the optical lens satisfy: 2.44 < L / f < 3.15; the effective focal length f2 of the second lens, the distance EP12 in the optical axis direction between the first spacer element and the second spacer element, and the central thickness CT2 of the second lens satisfy: 2.90 mm-1 (CT2 / EP12) / f2< 6.56mm -1 .

[0021] The optical lens of the present application is composed of a lens barrel, three lenses and at least two spacer elements, when the maximum height L of the lens barrel and the effective focal length f of the optical lens satisfy 2.44 < L / f < 3.15, by limiting the relationship between the maximum height L of the lens barrel and the focal length of the optical lens, the space of the lens in the lens barrel can be constrained and the performance of the lens can be ensured, however, the miniaturization of the lens barrel leads to that the lens located in the middle and rear of the lens barrel bears a large stress, which easily causes the lens located in the middle and rear of the lens barrel to break during assembly, resulting in poor assembly stability of the optical lens. The second lens among the three lenses is located in the middle and plays a role of bearing the first lens and the third lens, so the stability of the second lens is more important, and if the second lens is not stable during assembly, it will usually cause problems of the first lens and the third lens, and at the same time, the second lens is the thickest lens at the center, and the thickness ratio between the edge and the center affects the bearing stability, by constraining (CT2 / EP12) / f2 within a reasonable range, the overall shape of the second lens can be effectively limited, the edge thickness, the center thickness of the second lens and the focal length of the second lens are ensured within a reasonable range, the light deflection ability of the second lens is ensured while the overall shape of the second lens is maintained, the problem of breakage caused by excessive stress during assembly of the second lens is effectively avoided, and at the same time, the structure of the second lens does not affect the structural layout of the third lens, which helps to ensure the stability and reliability of the assembly of the optical lens, the above two parameter formulas constitute important parameter constraints in the design of the optical lens of the present application, which ensure that the optical lens can not only maintain compact structure and assembly reliability, but also achieve good optical performance. BRIEF DESCRIPTION OF DRAWINGS

[0022] The drawings constituting a part of the specification of the present application serve to provide a further understanding of the present application, the schematic embodiments of the present application and the description thereof serve to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0023] Figure 1 A size marking diagram of the optical lens of one optional embodiment of the present application is shown;

[0024] Figure 2 A size marking diagram of the optical lens of another optional embodiment of the present application is shown;

[0025] Figure 3 A structure schematic diagram of the optical lens of embodiment 1-1 of the present application is shown;

[0026] Figure 4 A structure schematic diagram of the optical lens of embodiment 1-2 of the present application is shown;

[0027] Figure 5 and Figure 6 The on-axis chromatic aberration and stigmation curves of the optical lens of the embodiment one of the utility model are shown respectively;

[0028] Figure 7 The structural schematic diagram of the optical lens of the embodiment 2-1 of the utility model is shown;

[0029] Figure 8 The structural schematic diagram of the optical lens of the embodiment 2-2 of the utility model is shown;

[0030] Figure 9 and Figure 10 The on-axis chromatic aberration and stigmation curves of the optical lens of the embodiment two of the utility model are shown respectively;

[0031] Figure 11 The structural schematic diagram of the optical lens of the embodiment 3-1 of the utility model is shown;

[0032] Figure 12 The structural schematic diagram of the optical lens of the embodiment 3-2 of the utility model is shown;

[0033] Figure 13 and Figure 14 The on-axis chromatic aberration and stigmation curves of the optical lens of the embodiment three of the utility model are shown respectively;

[0034] Figure 15 The structural schematic diagram of the optical lens of the embodiment 4-1 of the utility model is shown;

[0035] Figure 16 The structural schematic diagram of the optical lens of the embodiment 4-2 of the utility model is shown;

[0036] Figure 17 and Figure 18 The on-axis chromatic aberration and stigmation curves of the optical lens of the embodiment four of the utility model are shown respectively;

[0037] Figure 19 The force cloud diagram of the second lens and the third lens in the optical lens of an optional embodiment of the utility model is shown;

[0038] Figure 20 The force cloud diagram of the second lens and the third lens in an example optical lens is shown;

[0039] Figure 21 The force cloud diagram of the second lens and the third lens in another example optical lens is shown.

[0040] Among them, the above-mentioned drawing includes the following figure marks:

[0041] 10, protruding structure; P0, lens barrel; E1, first lens; S1, object side surface of the first lens; S2, image side surface of the first lens; P1, first spacer element; E2, second lens; S3, object side surface of the second lens; S4, image side surface of the second lens; P2, second spacer element; E3, third lens; S5, object side surface of the third lens; S6, image side surface of the third lens; P3, third spacer element. DETAILED DESCRIPTION

[0042] It should be noted that the embodiments and features of 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 accompanying drawings and in combination with the embodiments.

[0043] 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.

[0044] 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 direction 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.

[0045] 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.

[0046] In the drawings, the thickness, size and shape of the lens have been slightly exaggerated for the convenience of explanation. Specifically, the shape of the spherical surface or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical surface or aspherical surface is not limited to the shape of the spherical surface or aspherical surface shown in the drawings. The drawings are merely examples and are not strictly drawn to scale.

[0047] In this text, 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 this field, and the positive or negative of the R value (R refers to the radius of curvature in the paraxial region, usually the R value on the lens database (lens data) in optical software) is used to judge convex or concave. Taking the object side surface as an example, when the R value is positive, it is judged as convex, and when the R value is negative, it is judged as concave; taking the image side surface as an example, when the R value is positive, it is judged as concave, and when the R value is negative, it is judged as convex. In this application, the left side is the object side and the right side is the image side.

[0048] In order to solve the problem that it is difficult to balance miniaturization and assembly stability of optical lenses in the prior art, the present utility model provides an optical lens.

[0049] As Figures 1 to 18 shown, the optical lens includes a lens barrel, a lens group and a spacer element group assembled in the lens barrel. The lens group sequentially includes a first lens, a second lens and a third lens along the optical axis from the object side to the image side. Among them, the second lens has a positive optical power, the central thickness of the second lens is greater than the central thickness of the first lens, and the central thickness of the second lens is greater than the central thickness of the third lens; the spacer element group at least 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 is partially in contact with the image side surface of the first lens. The second spacer element is located between the second lens and the third lens and is partially in contact with the image side surface of the second lens; the maximum height L of the lens barrel and the effective focal length f of the optical lens satisfy: 2.44 < L / f < 3.15; the effective focal length f2 of the second lens, the spacing distance EP12 between the first spacer element and the second spacer element in the optical axis direction, and the central thickness CT2 of the second lens satisfy: 2.90mm -1 <(CT2 / EP12) / f2 < 6.56mm -1 .

[0050] The optical lens of the present application is composed of a lens barrel, three lenses and at least two spacer elements, when the maximum height L of the lens barrel and the effective focal length f of the optical lens satisfy 2.44 < L / f < 3.15, by limiting the relationship between the maximum height L of the lens barrel and the focal length of the optical lens, the space of the lens in the lens barrel can be constrained and the performance of the lens can be ensured, however, the miniaturization of the lens barrel leads to that the lens located in the middle and rear of the lens barrel bears a large stress, which easily causes the lens located in the middle and rear of the lens barrel to break during the assembly process, resulting in poor assembly stability of the optical lens. However, the second lens among the three lenses is located in the middle, which plays a role in supporting the first lens and the third lens, and the stability of the second lens is more important, if the second lens is not stable during assembly, it will usually cause problems of the first lens and the third lens, and the second lens is the thickest lens in the center, the thickness ratio between the edge and the center affects the stability of the support, and by constraining (CT2 / EP12) / f2 within a reasonable range, the overall shape of the second lens can be effectively limited, the edge thickness, the center thickness of the second lens and the focal length of the second lens can be ensured within a reasonable range, the overall shape of the second lens can be ensured while maintaining the light deflection ability of the second lens, effectively avoiding the problem of fragmentation caused by excessive stress during assembly of the second lens; at the same time, the structure of the second lens does not affect the structural layout of the third lens, which helps to ensure the stability and reliability of the assembly of the optical lens, the above two parameter formulas constitute important parameter constraints in the design of the optical lens of the present application, which ensures that the optical lens can maintain compact structure and assembly reliability while achieving good optical performance.

[0051] Table 1 gives the stress cloud comparison of three optical lenses.

[0052]

[0053] Table 1

[0054] By Figure 19 With Figure 20 And Figure 21 From the comparison of lens 1 to lens 3, the maximum stress borne by the second lens and the third lens in lens 2 satisfies 2.90mm -1 <(CT2 / EP12) / f2<6.56mm -1 The maximum stress borne by the second lens and the third lens in lens 2 is the smallest, obviously when (CT2 / EP12) / f2 is less than 2.9 or greater than 6.56, the maximum stress borne by the second lens in the optical lens becomes larger. Therefore, during the assembly process of lens 1 and lens 3, the stress borne by the second lens and the third lens under a certain fit amount is larger, which has a risk of fragmentation. However, during the assembly process of lens 2, the stress borne by the second lens and the third lens under a certain fit amount becomes smaller, and the risk of fragmentation is significantly reduced.

[0055] It should be noted that the present application limits (CT2 / EP12) / f2 within a reasonable range to control the overall shape of the second lens, ensure that the edge thickness, center thickness and focal length of the second lens are within a reasonable range, ensure that the second lens maintains its overall shape while maintaining its light deflection ability, effectively avoids the problem of cracking caused by excessive stress during assembly of the second lens; At the same time, it ensures the structural layout of the third lens, which can simultaneously reduce the stress borne by the third lens, thereby reducing the stress borne by the second lens and the third lens, and improving the assembly stability of the optical lens. When (CT2 / EP12) / f2 meets the above range, the purpose of improving the assembly stability is achieved, and it does not depend on the focal power and surface shape of other lenses, and the focal power and surface shape of the lenses are further optimized on this basis. The first lens and the third 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, which satisfies: 2.44 -1 <(CT2 / EP12) / f2<6.56mm -1 , can achieve the requirements of miniaturization while improving the assembly stability.

[0056] For example, the first lens has positive focal power, the second lens has positive focal power, and the third lens has negative focal power. For another example, the first lens has negative focal power, the second lens has positive focal power, and the third lens has positive focal power. For another example, the first lens has negative focal power, the second lens has positive focal power, and the third lens has negative focal power. For another example, the image side surface of the first lens is concave; the image side surface of the second lens is convex; the object side surface of the third lens is convex, the image side surface of the third lens is concave, and the image side surface of the third lens has a reverse point. The optical lens can be simulated by software and / or tools such as ZEMAX, CODEV, etc. In the process of simulation using 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.

[0057] In some optional embodiments, the outer circumferential surface of the lens barrel has a convex structure, and the maximum outer diameter Y of the convex structure satisfies: 3.1mm < Y < 3.4mm. By arranging the convex structure on the outer circumferential surface of the lens barrel, the optical lens can be connected with other structures, and the arrangement of the convex structure can improve the mechanical strength of the lens barrel, so that the lens barrel can better resist external impact and vibration, and the reliability of the optical lens is effectively improved. In addition, the arrangement of the convex structure can also improve the stability of the lens on the assembly tray during the assembly process; and provide sufficient space for chip attachment to ensure the compatibility of the optical lens and the chip. By limiting the maximum outer diameter of the convex structure, the radial size of the lens barrel can be limited while ensuring the structure of the lens barrel, which is conducive to the miniaturization of the optical lens.

[0058] In some optional embodiments, the interval distance EP12 of the first interval element and the second interval element in the direction of the optical axis, the center thickness CT2 of the second lens, and the inner diameter d2m of the image side surface of the second interval element satisfy: 1.05mm < EP12 / CT2 / d2m < 1.75mm. -1 <EP12 / CT2 / d2m < 1.75mm -1 By limiting the relationship between the distance of the image side surface of the first interval element and the object side surface of the second interval element in the direction of the optical axis extension, the center thickness of the second lens, and the inner diameter of the image side surface of the second interval element, the structure strength of the second lens is ensured, and the light can smoothly exit from the second interval element after being deflected by the second lens, so as to avoid affecting the propagation of light, which is conducive to reducing aberration and distortion and improving imaging quality.

[0059] In some optional embodiments, the radius of curvature R2 of the image side surface of the first lens, the radius of curvature R3 of the object side surface of the second lens, and the inner diameter d2s of the object side surface of the second interval element satisfy: 1.25 < (R2+R3) / d2s < 4.20. By limiting the relationship between the radius of curvature of the image side surface of the first lens, the radius of curvature of the object side surface of the second lens, and the inner diameter of the object side surface of the second interval element, the deflection angle of the light during the propagation between the first lens and the second lens can be ensured, and large-angle deflection is avoided, which is conducive to the smooth passage of the imaging light through the second interval element, and the second interval element can effectively block stray light, which is conducive to improving the imaging quality of the optical lens.

[0060] In some optional embodiments, the following relationship is satisfied among the inner diameter d2m of the image-side surface of the second spacer element, the outer diameter D2m of the image-side surface of the second spacer element, and the inner diameter d1s of the object-side surface of the first spacer element: 2.0 < (D2m-d1s) / d2m < 3.45. By restricting the relationship among the inner diameter of the object-side surface of the first spacer element, the inner diameter of the image-side surface of the second spacer element, and the outer diameter of the image-side surface of the second spacer element, the stability of the abutment between the second lens and the second spacer element can be ensured while the second spacer element effectively blocks the surface, and meanwhile, the stray light deflected at a large angle can be absorbed, so as to reduce the risk of stray light.

[0061] In some optional embodiments, the spacer element group further comprises a third spacer element, the third spacer element is located on the image side of the third lens, and the third spacer element is partially in contact with the image-side surface of the third lens. The following relationship is satisfied among the central thickness CT2 of the second lens, the central thickness CT3 of the third lens, and the central thickness CT1 of the first lens: 0.70 < CT2 / (CT3+CT1) < 1.45. The following relationship is satisfied among the interval distance EP12 of the first spacer element and the second spacer element in the optical axis direction, the distance EP01 between the object-side end surface of the lens barrel and the object-side surface of the first spacer element in the optical axis direction, and the interval distance EP23 of the second spacer element and the third spacer element in the optical axis direction: 0.25 < EP12 / (EP01+EP23) < 0.5. By restricting the distance between the two adjacent spacer elements, the edge thickness of the lens located between the two adjacent spacer elements can be restricted, and meanwhile, by limiting the central thickness of the first lens, the second lens, and the third lens, the thickness-thinness ratio of the first lens to the third lens can be limited, so as to reduce the difficulty of lens forming, optimize the propagation path of the light rays in the first lens to the third lens, reduce the scattering and absorption of the light rays in the spacer element, further optimize the optical performance of the optical lens, and make the optical lens have good imaging quality.

[0062] In some optional embodiments, the following relationship is satisfied among the inner diameter d2s of the object-side surface of the second spacer element, the outer diameter D2m of the image-side surface of the second spacer element, the outer diameter D1m of the image-side surface of the first spacer element, and the inner diameter d1s of the object-side surface of the first spacer element: 2.10 < D2m / D1m+d2s / d1s < 3.80. By controlling the relationship among the inner diameter and the outer diameter of the object-side surface of the second spacer element and the inner diameter and the outer diameter of the object-side surface of the first spacer element, the stability of the abutment of the first lens and the second lens can be ensured while the light rays are smoothly passing through the first spacer element and the second spacer element, and meanwhile, the reasonable inner diameter and the outer diameter of the spacer element can block the excessive light rays after being emitted by the first lens and the second lens and reduce the internal reflection stray light generated by the second lens, so as to reduce the risk of stray light.

[0063] In some optional embodiments, the effective focal length f of the optical lens, half of the maximum field of view angle Semi-FOV of the optical lens, and the maximum height L of the lens barrel satisfy: 0.25 < f*tan(Semi-FOV) / L < 0.55. By limiting the relationship between the effective focal length of the optical lens, half of the maximum field of view angle of the optical lens, and the maximum height of the lens barrel, the balance between the effective focal length, the field of view angle of the optical lens, and the maximum height of the lens barrel can be effectively guaranteed, so that the optical lens can simultaneously consider both image quality and miniaturization. Limiting f*tan(Semi-FOV) / L in the above range helps to reduce aberration, improve resolution and contrast while ensuring the size of the optical lens.

[0064] In some optional embodiments, the set of spacer elements further includes a third spacer element, the third spacer element is located on the image side of the third lens, and the third spacer element partially contacts the image side surface of the third lens. The interval distance EP23 between the second spacer element and the third spacer element in the optical axis direction, the outer diameter D2m of the image side surface of the second spacer element, and the inner diameter d2m of the image side surface of the second spacer element satisfy: 0.10 < EP23 / (D2m-d2m) < 0.28. By restricting the outer diameter and the inner diameter of the image side surface of the second spacer element and the interval between the second spacer element and the third spacer element, the stability of the abutment between the second lens and the second spacer element is guaranteed, while helping to reduce the scattering and loss of light when passing through the spacer element, thereby maintaining the quality and clarity of the image. In addition, limiting EP23 / (D2m-d2m) in the above range can also ensure the relative position stability between the spacer elements, reduce the performance degradation caused by vibration or impact, and improve the reliability of the lens.

[0065] In some optional embodiments, the set of spacer elements further includes a third spacer element, the third spacer element is located on the image side of the third lens, and the third spacer element partially contacts the image side surface of the third lens. The inner diameter d0m of the image side end surface of the lens barrel and the minimum aperture d3min of the third spacer element satisfy: 0.95 < d0m / d3min < 2.0. By limiting the relationship between the inner diameter of the image side end surface of the lens barrel and the minimum aperture of the third spacer element, the compatibility between the inner diameter of the image side end surface of the lens barrel and the minimum aperture of the third spacer element can be ensured, so that the optical lens can be smoothly connected with other devices or elements, and the overall function is maximized. At the same time, effectively controlling the inner diameter of the image side end surface of the lens barrel and the minimum aperture of the third spacer element also helps to reduce the problems of stray light and ghost image of the system, and helps to improve the imaging quality of the optical lens.

[0066] In some optional embodiments, the distance EP01 between the object-side end surface of the lens barrel and the object-side surface of the first spacer element in the direction of the optical axis, the distance SG11 from the intersection of the object-side surface of the first lens and the optical axis to the object-side surface of the structural region of the first lens along the optical axis, and the central thickness CT1 of the first lens satisfy: 0.75 < EP01 / (SG11+CT1) < 2.50. By limiting the distance between the object-side end surface of the lens barrel and the object-side surface of the first spacer element in the direction of the optical axis, the axial distance between the intersection of the object-side surface of the first lens and the optical axis and the effective radius vertex of the object-side surface of the first lens, and the central thickness of the first lens, the overall shape of the first lens can be constrained to facilitate the smooth entry of light into the optical system, to provide sufficient optical performance for the optical lens while reducing the difficulty of forming the first lens and improving the yield of the first lens.

[0067] In some optional embodiments, the distance SG11 from the intersection of the object-side surface of the first lens and the optical axis to the object-side surface of the structural region of the first lens along the optical axis, the central thickness CT1 of the first lens, and the central thickness CT2 of the second lens satisfy: 1.65 < (SG11+CT2) / CT1 < 3.30. By constraining the relationship between the axial distance between the intersection of the object-side surface of the first lens and the optical axis and the effective radius vertex of the object-side surface of the first lens, the central thickness of the first lens, and the central thickness of the second lens, the mechanical strength and stability of the first lens and the second lens can be maintained while optimizing their optical performance, and the edge design of the lenses can be further optimized to reduce problems such as stray light and ghost images.

[0068] In another embodiment, as shown in FIG. 1, Figures 1 to 18 In another embodiment, as shown in FIG. 1,

[0069] The optical lens of the present application is composed of a lens barrel, three lenses and at least two spacer elements. When the maximum height L of the lens barrel and the effective focal length f of the optical lens satisfy 2.44 < L / f < 3.15, by limiting the relationship between the maximum height L of the lens barrel and the focal length of the optical lens, the space of the lenses in the lens barrel can be constrained, thereby facilitating the limitation of the thickness of the lenses, ensuring the overall size of the optical lens while ensuring the imaging quality of the optical lens, so that the optical lens can balance miniaturization and imaging quality. However, the development of the lens barrel in the direction of miniaturization leads to a larger stress on the lenses located in the middle and rear of the lens barrel, which easily causes the lenses located in the middle and rear of the lens barrel to break during assembly, resulting in poor assembly stability of the optical lens. The second lens and the third lens in the three lenses bear a larger pressure, which easily causes the second lens or the third lens to break, thereby resulting in poor assembly stability of the optical lens. By constraining Dr2r5 / EP12+CT3 / EP23 within a reasonable range, the overall shape of the second lens and the third lens can be effectively limited, which is conducive to the second lens and the third lens sharing the stress evenly, reducing the risk of excessive stress on a local position of a lens, improving the stability of the second lens and the third lens, and further improving the assembly stability of the optical lens.

[0070] In another embodiment, as shown in Figures 1 to 18 The optical lens includes a lens barrel and a lens group and a spacer element group assembled in the lens barrel. The lens group includes a first lens, a second lens and a third lens along the optical axis from the object side to the image side. The second lens has a positive focal length. The image side surface of the first lens is concave, the image 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 spacer element group includes at least 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 interval distance EP12 of the first spacer element and the second spacer element in the optical axis direction and the center thickness CT2 of the second lens satisfy 1.25 < CT2 / EP12 < 1.85. The curvature radius R3 of the object side surface of the second lens, the curvature radius R4 of the image side surface of the second lens, the inner diameter d1m of the image side surface of the first spacer element and the inner diameter d2s of the object side surface of the second spacer element satisfy 0.9 < (|R3| + |R4|) / (d2s + d1m) < 2.75.

[0071] The optical lens of the present application is composed of a lens barrel, three lenses and at least two spacer elements. When the distance EP12 between the first spacer element and the second spacer element in the optical axis direction and the center thickness CT2 of the second lens satisfy 1.25 < CT2 / EP12 < 1.85, by limiting the relationship between the center thickness and the edge thickness of the second lens, the structural strength of the second lens can be improved, which is conducive to improving the assembly stability of the optical lens in a miniaturized space. Since the second lens changes rapidly from the center to the edge, it is easy to produce large-angle light deflected to the inner wall of the lens barrel when the light passes through the second lens, thereby causing the optical lens to have stray light problems. By limiting (|R3|+|R4|) / (d2s+d1m) within a reasonable range, the present application can limit the angle of the light entering the object side of the second lens, reduce the large-angle light entering the second lens to produce a larger angle of deflection, thereby facilitating the reduction of stray light generation. In addition, by limiting the radii of curvature of the object side and the image side of the second lens, the light process entering the second lens is adjusted, and the internal reflection stray light generated inside the second lens is reduced. The inner diameter of the image side of the first spacer element and the inner diameter of the object side of the second spacer element can cooperate to block the excess light entering the edge of the second lens and absorb the excess light generated after passing through the edge of the second lens, thereby causing these non-imaging light not to reach the imaging surface, further reducing the generation of stray light.

[0072] Of course, the present embodiment can also include other parameter formulas in the above embodiments, which will not be described one by one here.

[0073] It should be noted that the optical axis direction refers to the extension direction of the optical axis.

[0074] Optionally, the optical lens can further include a protective glass for protecting the photosensitive element located on the imaging surface.

[0075] The optical lens in the present application can adopt multiple lenses, for example, three lenses as described above. In the present application, at least one of the mirror surfaces of each lens is a non-spherical mirror surface. The characteristic of the aspherical lens is 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 aspherical lens has better curvature radius characteristics, has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting the aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality.

[0076] 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 in the present application, to obtain the various results and advantages described in the present specification. For example, although described in the embodiments by way of example of three lenses, the optical lens is not limited to including three lenses. If necessary, the optical lens can also include other numbers of lenses.

[0077] Figure 1 and Figure 2 respectively show the size annotation schematic diagram of an optical lens of the present application, Figure 1 and Figure 2 The parameters d1s, D1m, d2s, d2m, D2m, d0m, EP01, EP12, EP23, L, Y, d3min, SG11 and the like are marked in the figures, to clearly and intuitively understand the meaning of the parameters. In order to facilitate the description of the optical lens and the surface shape of the specific lens, the parameters are no longer embodied in the figures when the specific embodiments are described subsequently.

[0078] The specific surface shape and parameters of the optical lens applicable to the above embodiments are further described below with reference to the figures.

[0079] It should be noted that there are two examples, example 1-1 and example 1-2, in the following embodiment one, two examples, example 2-1 and example 2-2, in the second embodiment, three examples, example 3-1 and example 3-2, in the third embodiment, and four examples, example 4-1 and example 4-2, in the fourth embodiment. The curvature radius, central thickness and the like of the first lens to the third lens of the optical lens in the three examples in the same embodiment are the same, but the thickness, inner diameter and outer diameter of the lens barrel, the first spacing element, the second spacing element and the third spacing element and the shape of part of the lenses are different. Or, the main structure for imaging is the same, and the auxiliary structure for imaging is different.

[0080] It should be noted that any one of the following embodiments one to four is applicable to the present application.

[0081] Embodiment one

[0082] As shown in Figures 3 to 6 , the optical lens of embodiment one is described. Figure 3 shows the structure schematic diagram of the optical lens of example 1-1, Figure 4 shows the structure schematic diagram of the optical lens of example 1-2.

[0083] As shown in Figure 3 and Figure 4As shown, the optical lens includes a lens barrel P0, three lenses and multiple spacer elements. The lens barrel P0 includes a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3 and a third spacer element P3 arranged sequentially from the object side to the image side.

[0084] like Figure 3 The diagram shown is a schematic representation of the optical lens structure of Embodiment 1-1. In this example, the object-side surface S1 of the first lens abuts against the lens barrel P0. The object-side surface and image-side surface of the first spacer element P1 abut against the image-side surface S2 of the first lens and the object-side surface S3 of the second lens, respectively. The object-side surface and image-side surface of the second spacer element P2 abut against 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 abuts against the object-side surface of the third spacer element P3. The protruding structure 10 of the lens barrel is located in the middle of the lens barrel.

[0085] like Figure 4 The diagram shown is a structural schematic of the optical lens in Embodiments 1-2. In Embodiments 1-2, the abutment and contact method of each spacer element is similar to that in Embodiment 1-1, and can be referred to the relevant description in Embodiment 1-1, which will not be repeated here.

[0086] In summary, the structural parameters of the optical lens in Embodiment 1 under Embodiments 1-1 and 1-2 are shown in Table 2. (Unit: mm)

[0087]

[0088]

[0089] Table 2

[0090] In Embodiment 1, the first lens has positive optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens has positive optical power, its object-side surface S3 is concave, and its image-side surface S4 is convex. The third lens has negative optical power, its object-side surface S5 is convex, and its image-side surface S6 is concave. An aperture stop is located between the second and third lenses.

[0091] Table 3 shows the basic structural parameters of the optical lens in Embodiment 1, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0092]

[0093] Table 3

[0094] In Embodiment 1, the object-side surface and image-side surface of the first lens E1 to the third lens E3 are both aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0095]

[0096] wherein x is the sag of the aspherical surface at a position along the optical axis at a height h from the vertex of the aspherical surface; c is the paraxial curvature of the aspherical 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 constant; and Ai is the correction coefficient of the i-th order of the aspherical surface. Table 4 below gives the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20 which can be used for the aspherical surfaces S1-S6 in Example 1.

[0097] Surface number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 4.83E+00 -4.64E+01 9.50E+02 -1.32E+04 1.21E+05 -6.69E+05 2.02E+06 -2.60E+06 0.00E+00 S2 2.13E+01 -5.48E+02 2.14E+04 -4.63E+05 4.98E+06 -3.12E+07 1.26E+08 0.00E+00 0.00E+00 S3 -2.27E+00 -2.62E+03 1.12E+05 -1.72E+06 1.28E+08 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S4 2.75E+01 -7.95E+02 1.37E+04 -3.24E+05 3.73E+06 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S5 -1.31E+01 9.46E+02 -5.53E+04 1.90E+06 -4.12E+07 5.70E+08 -4.83E+09 2.26E+10 -4.44E+10 S6 -8.63E+01 3.08E+03 -9.23E+04 1.91E+06 -2.65E+07 2.40E+08 -1.35E+09 4.30E+09 -5.93E+09

[0098] Table 4

[0099] Figure 5 The axial chromatic aberration curve of the optical lens of Example 1 is shown, which represents the convergence point deviation of light rays of different wavelengths after passing through the optical lens. Figure 6 The astigmatism curve of the optical lens of Example 1 is shown, which represents the meridional image curvature and sagittal image curvature.

[0100] According to Figure 5 and Figure 6 it can be seen that the optical lens given in Example 1 can achieve good imaging quality.

[0101] Example 2

[0102] As Figures 7 to 10 shown, the optical lens of Example 2 is described. Figure 7 The structural schematic diagram of the optical lens of Example 2-1 is shown, Figure 8 The structural schematic diagram of the optical lens of Example 2-2 is shown.

[0103] As Figure 7 and Figure 8 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, a third lens E3, and a third spacer element P3.

[0104] As Figure 7Figure 2-1 shows a schematic diagram of the optical lens structure of Example 2-1. In this example, the object side S1 of the first lens is in abutment with the barrel PO, the object side and image side of the first spacer P1 are in abutment with the image side S2 of the first lens and the object side S3 of the second lens, respectively, the object side and image side of the second spacer P2 are in abutment with the image side S4 of the second lens and the object side S5 of the third lens, respectively, and the image side S6 of the third lens is in abutment with the object side of the third spacer P3. The convex structure 10 of the barrel is located at the end of the barrel close to the image side.

[0105] Figure 2-2 shows a schematic diagram of the optical lens structure of Example 2-2. In Example 2-2, the abutment mode of each spacer is similar to that of Example 2-1, and the relevant description in Example 2-1 can be referred to here. Figure 8

[0106] In summary, the structure parameters of the optical lens of Example 2 in Examples 2-1 and 2-2 are shown in Table 5. (unit: mm)

[0107]

[0108]

[0109] Table 5

[0110] In Example 2, the first lens has a negative focal 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 has a positive focal power, the object side S3 of the second lens is convex, and the image side S4 of the second lens is convex. The third lens has a positive focal power, the object side S5 of the third lens is convex, and the image side S6 of the third lens is concave. The stop is located between the second lens and the third lens.

[0111] Table 6 shows the basic structure parameters of the optical lens of Example 2, wherein the units of the curvature radius and the thickness / distance are millimeters (mm).

[0112]

[0113] Table 6

[0114] Table 7 shows the high-order term coefficients of the aspherical surfaces that can be used in Example 2, wherein each aspherical surface can be defined by the formula (1) given in Example 1. In this example, the object side and image side of the first lens to the third lens are aspherical surfaces.

[0115] Surface number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 4.03E+00 -5.28E+01 1.20E+03 -1.53E+04 1.12E+05 -3.60E+05 0.00E+00 0.00E+00 0.00E+00 S2 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S3 1.00E+02 -6.26E+04 1.69E+07 -2.40E+09 1.70E+11 -4.68E+12 0.00E+00 0.00E+00 0.00E+00 S4 -1.12E+02 9.38E+03 -5.00E+05 1.57E+07 -2.61E+08 1.76E+09 0.00E+00 0.00E+00 0.00E+00 S5 -2.69E+01 -8.27E+01 5.70E+04 -3.07E+06 8.50E+07 -1.32E+09 1.08E+10 -3.59E+10 0.00E+00 S6 -7.38E+01 1.88E+03 -4.69E+04 8.53E+05 -1.06E+07 8.38E+07 -3.76E+08 7.25E+08 0.00E+00

[0116] Table 7

[0117] Figure 9 ​The axial chromatic aberration curve of the optical lens of embodiment two is shown, which represents the convergence point deviation of light rays of different wavelengths after passing through the optical lens. Figure 10 The astigmatism curve of the optical lens of embodiment two is shown, which represents the meridional image curvature and sagittal image curvature.

[0118] According to Figure 9 and Figure 10 It can be seen that the optical lens given in embodiment two can achieve good imaging quality.

[0119] Embodiment three

[0120] As Figures 11 to 14 shown, the optical lens of embodiment three is described. Figure 11 The structural schematic diagram of the optical lens of embodiment 3-1 is shown, Figure 12 The structural schematic diagram of the optical lens of embodiment 3-2 is shown.

[0121] As Figure 11 and Figure 12 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, a third lens E3 and a third spacer element P3.

[0122] As Figure 11 shown, the structural schematic diagram of the optical lens of embodiment 3-1 is shown. In this example, the object side surface S1 of the first lens abuts against the lens barrel P0, the object side surface and the image side surface of the first spacer element P1 abut against the image side surface S2 of the first lens and the object side surface S3 of the second lens respectively, the object side surface and the image side surface of the second spacer element P2 abut against the image side surface S4 of the second lens and the object side surface S5 of the third lens respectively, and the image side surface S6 of the third lens abuts against the object side surface of the third spacer element P3. Among them, the convex structure 10 of the lens barrel is located at the end of the lens barrel close to the image side.

[0123] As Figure 12 shown, the structural schematic diagram of the optical lens of embodiment 3-2 is shown. In embodiment 3-2, the abutting abutting mode of each spacer element is similar to that of embodiment 3-1, and the related description in embodiment 3-1 can be referred to, which will not be repeated here.

[0124] In summary, the structural parameters of the optical lens of embodiment three under embodiment 3-1 and embodiment 3-2 are shown in Table 8. (unit: mm)

[0125]

[0126]

[0127] Table 8

[0128] In embodiment three, the first lens has negative refractive 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 has positive refractive power, the object side S3 of the second lens is convex, and the image side S4 of the second lens is convex. The third lens has positive refractive power, the object side S5 of the third lens is convex, and the image side S6 of the third lens is concave. The diaphragm is located between the second lens and the third lens.

[0129] Table 9 shows the basic structure parameter table of the optical lens of embodiment three, wherein the units of the radius of curvature, thickness / distance are millimeters mm.

[0130]

[0131] Table 9

[0132] Table 10 shows the high-order term coefficients of the aspherical surfaces that can be used in the optical lens of embodiment three, wherein each aspherical surface can be defined by the formula (1) given in embodiment one. In this embodiment, the object side and the image side of the first lens to the third lens are aspherical surfaces.

[0133] Surface number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 3.10E+00 1.21E+01 9.49E+02 -5.24E+03 -1.58E+05 3.48E+06 0.00E+00 0.00E+00 0.00E+00 S2 3.46E+00 3.10E+03 -3.66E+05 2.66E+07 -9.24E+08 1.53E+10 0.00E+00 0.00E+00 0.00E+00 S3 -2.57E+00 6.60E+01 -5.13E+05 6.63E+07 -3.27E+09 4.96E+10 0.00E+00 0.00E+00 0.00E+00 S4 -6.01E+01 4.34E+03 -2.05E+05 6.28E+06 -1.06E+08 7.62E+08 0.00E+00 0.00E+00 0.00E+00 S5 -7.58E+01 3.72E+03 -1.74E+05 5.46E+06 -1.09E+08 1.28E+09 -8.01E+09 2.15E+10 0.00E+00 S6 -6.20E+01 1.59E+03 -3.76E+04 6.12E+05 -6.70E+06 4.56E+07 -1.77E+08 3.19E+08 0.00E+00

[0134] Table 10

[0135] Figure 13 The on-axis chromatic aberration curve of the optical lens of embodiment three is shown, which represents the convergence point deviation of light rays of different wavelengths after passing through the optical lens. Figure 14 The astigmatism curve of the optical lens of embodiment three is shown, which represents the meridional image curvature and sagittal image curvature.

[0136] According to Figure 13 and Figure 14 It can be seen that the optical lens given in embodiment three can achieve good imaging quality.

[0137] Embodiment four

[0138] As Figures 15 to 18 shown, the optical lens of embodiment four is described. Figure 15 The structural schematic diagram of the optical lens of embodiment 3-1 is shown, Figure 16 The structural schematic diagram of the optical lens of embodiment 3-2 is shown.

[0139] As Figure 15 and Figure 16 shown, the optical lens includes a lens barrel P0, three lenses, and a plurality of interval elements, the lens barrel P0 includes, in order from the object side to the image side, a first lens E1, a first interval element P1, a second lens E2, a second interval element P2, a third lens E3, and a third interval element P3.

[0140] like Figure 15 The diagram shows a schematic of the optical lens structure of Embodiment 3-1. In this example, the object-side surface S1 of the first lens abuts against the lens barrel P0; the object-side surface and image-side surface of the first spacer element P1 abut against the image-side surface S2 of the first lens and the object-side surface S3 of the second lens, respectively; the object-side surface and image-side surface of the second spacer element P2 abut against the image-side surface S4 of the second lens and the object-side surface S5 of the third lens, respectively; and the image-side surface S6 of the third lens abuts against the object-side surface of the third spacer element P3. The protruding structure 10 of the lens barrel is located at the end of the lens barrel closest to the image side.

[0141] like Figure 16 The diagram shown is a schematic representation of the optical lens structure of Embodiment 3-2. In Embodiment 3-2, the abutment and contact method of each spacer element is similar to that of Embodiment 3-1, and can be referred to the relevant description in Embodiment 3-1, which will not be repeated here.

[0142] In summary, the structural parameters of the optical lens in Example 4, as shown in Examples 3-1 and 3-2, are illustrated in Table 11. (Unit: mm)

[0143] Parameter / Embodiment 2-1 2-2 d1s 0.268 0.249 d1m 0.268 0.249 D1m 1.300 0.875 d2s 0.481 0.512 d2m 0.481 0.512 D2m 1.430 1.452 d0m 1.810 1.860 EP01 0.422 0.435 EP12 0.190 0.229 EP23 0.209 0.249 L 1.279 1.260 Y 3.167 3.216 SG11 0.010 0.024 d3min 1.105 1.133

[0144] Table 11

[0145] In Embodiment 4, the first lens has negative optical power, and its object-side surface S1 and image-side surface S2 are both concave. The second lens has positive optical power, and its object-side surface S3 and image-side surface S4 are both convex. The third lens has negative optical power, its object-side surface S5 is convex, and its image-side surface S6 is concave. An aperture stop is located between the second and third lenses.

[0146] Table 12 shows the basic structural parameters of the optical lens in Embodiment 4, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0147] Surface number Surface type Radius of curvature Thickness Material Conic constant OBJ Spherical Infinite 100.0000 Refractive index Abbe number S1 Aspherical -2.4507 0.1609 1.546 55.99 0.0000 S2 Aspherical 0.6035 0.1151 STO Spherical Infinite 0.0175 0.0000 S3 Aspherical 0.5269 0.3481 1.546 55.99 -46.5114 S4 Aspherical -0.1692 0.0216 -0.5662 S5 Aspherical 1.0790 0.1426 1.678 19.24 13.6873 S6 Aspherical 0.2293 0.1473 -2.4059 S7 Spherical Infinite 0.1100 1.542 47 S8 Spherical Infinite 0.0750 S9 Spherical Infinite

[0148] Table 12

[0149] Table 13 shows the higher-order coefficients that can be used for each aspherical mirror in Embodiment 4, wherein each aspherical surface shape can be defined by formula (1) given in Embodiment 1 above. In this embodiment, the object-side and image-side surfaces of the first to third lenses are all aspherical.

[0150] Surface number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 7.04E+00 -6.03E+01 -4.03E+02 1.44E+04 -1.46E+05 5.75E+05 0.00E+00 0.00E+00 0.00E+00 S2 -7.73E+00 6.46E+03 -7.26E+05 4.07E+07 -1.15E+09 1.28E+10 0.00E+00 0.00E+00 0.00E+00 S3 2.35E+01 -1.31E+03 -7.18E+04 7.71E+06 -2.05E+08 1.59E+09 -1.43E+09 0.00E+00 0.00E+00 S4 1.19E+01 5.24E+02 -1.33E+04 -6.44E+05 4.25E+07 -8.52E+08 6.03E+09 0.00E+00 0.00E+00 S5 -4.96E+01 2.86E+03 -1.61E+05 5.61E+06 -1.19E+08 1.43E+09 -8.50E+09 1.74E+10 0.00E+00 S6 -5.45E+01 2.18E+03 -6.89E+04 1.46E+06 -2.00E+07 1.67E+08 -7.64E+08 1.46E+09 0.00E+00

[0151] Table 13

[0152] Figure 17 An axial chromatic aberration curve of the optical lens of Embodiment Four is shown, which represents the convergence point deviation of light rays of different wavelengths after passing through the optical lens. Figure 18 An astigmatism curve of the optical lens of Embodiment Four is shown, which represents the meridional image curvature and sagittal image curvature.

[0153] According to Figure 17 and Figure 18 It can be seen that the optical lens given by Embodiment Four can achieve good imaging quality.

[0154] In summary, the optical lenses of Embodiments One to Four respectively satisfy the relationships shown in Table 14.

[0155]

[0156]

[0157] Table 14

[0158] Table 15 shows the effective focal length and half field angle (unit: mm) of each lens of the optical lenses of Embodiments One to Four.

[0159] Parameter / Embodiment One Two Three Four Semi-FOV 49.46 51.38 40.74 57.45 f 0.43 0.44 0.44 0.41 f1 83.95 -1.12 -0.84 -0.87 f2 0.27 0.39 0.43 0.28 f3 -0.42 10930.20 1.79 -0.45

[0160] Table 15

[0161] 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 those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0162] It should be noted that the terms used herein are only intended to describe specific embodiments and are not intended to limit 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 be understood that, when the terms "comprise" and / or "include" are used in the specification, there is a presence of a feature, step, work, device, component and / or combination thereof.

[0163] 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.

[0164] 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 includes a lens barrel body, a lens group and a spacer element group assembled in the lens barrel body, The lens group includes, in order from the object side to the image side along the optical axis, a first lens, a second lens and a third lens, wherein the second lens has positive refractive power, the central thickness of the second lens is greater than the central thickness of the first lens, and the central thickness of the second lens is greater than the central thickness of the third lens; The spacer element group includes at least a first spacer element and a second spacer element, the first spacer element is located between the first lens and the second lens and at least partially contacts the image side surface of the first lens, and the second spacer element is located between the second lens and the third lens and at least partially contacts the image side surface of the second lens; The maximum height L of the lens barrel, the effective focal length f of the optical lens and the maximum height L of the lens barrel satisfy: 2.44 < L / f < 3.

15. between the effective focal length f2 of the second lens, the interval distance EP12 of the first interval element and the second interval element in the optical axis direction, and the center thickness CT2 of the second lens satisfies: 2.90mm -1 <(CT2 / EP12) / f2<6.56mm -1 .

2. The optical lens of claim 1, wherein, The outer circumferential surface of the lens barrel has a convex structure, and the maximum outer diameter Y of the convex structure satisfies: 3.1 mm < Y < 3.4 mm.

3. The optical lens of claim 1, wherein, The interval distance EP12 of the first interval element and the second interval element in the optical axis direction, the center thickness CT2 of the second lens, and the inner diameter d2m of the image side surface of the second interval element satisfy: 1.05 mm < EP12 / CT2 / d2m < 1.75 mm -1 <EP12 / CT2 / d2m < 1.75 mm -1 .

4. The optical lens of claim 1, wherein, The radius of curvature R2 of the image side surface of the first lens, the radius of curvature R3 of the object side surface of the second lens, and the inner diameter d2s of the object side surface of the second spacer element satisfy: 1.25 < (R2+R3) / d2s < 4.

20.

5. The optical lens of claim 1, wherein, The inner diameter d2m of the image side surface of the second spacer element, the outer diameter D2m of the image side surface of the second spacer element, and the inner diameter d1s of the object side surface of the first spacer element satisfy: 2.0 < (D2m-d1s) / d2m < 3.

45.

6. The optical lens of claim 1, wherein, The spacer element group further includes a third spacer element, the third spacer element is located on the image side of the third lens, and the third spacer element at least partially contacts the image side surface of the third lens, The central thickness CT2 of the second lens, the central thickness CT3 of the third lens, and the central thickness CT1 of the first lens satisfy: 0.70 < CT2 / (CT3+CT1) < 1.45; The interval distance EP12 of the first spacer element and the second spacer element in the optical axis direction, the distance EP01 between the object side end surface of the lens barrel and the object side surface of the first spacer element in the optical axis direction, and the interval distance EP23 between the second spacer element and the third spacer element in the optical axis direction satisfy: 0.25 < EP12 / (EP01+EP23) < 0.

5.

7. The optical lens of claim 1, wherein, The inner diameter d2s of the object side surface of the second spacer element, the outer diameter D2m of the image side surface of the second spacer element, the outer diameter D1m of the image side surface of the first spacer element, and the inner diameter d1s of the object side surface of the first spacer element satisfy: 2.10 < D2m / D1m+d2s / d1s < 3.

80.

8. The optical lens of claim 1, wherein, The effective focal length f of the optical lens, half of the maximum field angle Semi-FOV of the optical lens, and the maximum height L of the lens barrel satisfy: 0.25 < f*tan(Semi-FOV) / L < 0.

55.

9. The optical lens of claim 1, wherein, The spacer element group further includes a third spacer element located on the image side of the third lens, and the third spacer element is in partial contact with the image side surface of the third lens, and a distance EP23 in the optical axis direction between the second spacer element and the third spacer element, an outer diameter D2m of the image side surface of the second spacer element, and an inner diameter d2m of the image side surface of the second spacer element satisfy: 0.10 < EP23 / (D2m-d2m) < 0.

28.

10. The optical lens of claim 1, wherein, The spacer element group further includes a third spacer element located on the image side of the third lens, and the third spacer element is in partial contact with the image side surface of the third lens, and an inner diameter d0m of the image side end surface of the lens barrel and a minimum aperture diameter d3min of the third spacer element satisfy: 0.95 < d0m / d3min < 2.

0.

11. The optical lens of any of claims 1 to 10, wherein, A distance EP01 in the optical axis direction between the object side end surface of the lens barrel and the object side surface of the first spacer element, a distance SG11 along the optical axis direction from the intersection of the object side surface of the first lens and the optical axis to the object side surface of the structural region of the first lens, and a central thickness CT1 of the first lens satisfy: 0.75 < EP01 / (SG11+CT1) < 2.

50.

12. The optical lens of any of claims 1 to 10, wherein, A distance SG11 along the optical axis direction from the intersection of the object side surface of the first lens and the optical axis to the object side surface of the structural region of the first lens, a central thickness CT1 of the first lens, and a central thickness CT2 of the second lens satisfy: 1.65 < (SG11+CT2) / CT1 < 3.

30.

13. The optical lens of any of claims 1 to 10, wherein, The optical lens satisfies at least one of the following: The image side surface of the first lens is a concave surface; The image side surface of the second lens is a convex surface; The object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; The image side surface of the third lens has an inflection point.

Images