Optical lens

Abstract

The utility model provides an optical lens. The optical lens comprises a lens barrel, three lenses and at least one spacing element, wherein 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 which are sequentially arranged from an object side to an image side; 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 is in contact with the image side surface part of the first lens; the effective focal length f1 of the first lens and the distance EP01 between the end face, closest to the object side, of the lens barrel and the object side face of the first spacing element meet the condition that f1 / EP01 is larger than or equal to-3.27 and smaller than or equal to-1.93; the inner diameter d1s of the object side surface of the first spacing element and the curvature radius R2 of the image side surface of the first lens meet the condition that d1s / R2 is greater than or equal to 0.63 and less than or equal to 1.59. According to the utility model, the problem of poor reliability caused by the miniaturization requirement of the optical lens in the prior art 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 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, and for a part of electronic devices, the optical lens is required to have the characteristics of miniaturization while meeting the requirements of image pickup.

[0003] Under normal circumstances, the miniaturized optical lens has the characteristics of small head to reduce the opening area of the electronic device. In some cases, in order to ensure that the imaging quality of the optical lens is not affected and at the same time ensure that the optical lens has a small head, the thickness of the barrel wall of the object side end of the lens barrel is reduced, which results in a small lens barrel thickness, resulting in poor reliability.

[0004] That is, the optical lens in the prior art has the problem of poor reliability due to meeting the miniaturization requirement. UTILITY MODEL CONTENTS

[0005] The main purpose of the utility model is to provide an optical lens to solve the problem of poor reliability of the optical lens in the prior art due to meeting the miniaturization requirement.

[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 spacer element, the three lenses and the at least one spacer 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 spacer element comprises a first spacer element, the first spacer element is located between the first lens and the second lens and is in contact with the image side surface of the first lens; wherein the effective focal length f1 of the first lens and the distance EP01 between the end face of the lens barrel closest to the object side and the object side surface of the first spacer element satisfy: -3.27≤f1 / EP01≤-1.93; the inner diameter d1s of the object side surface of the first spacer element and the curvature radius R2 of the image side surface of the first lens satisfy: 0.63≤d1s / R2≤1.59.

[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 focal power, the second lens with positive focal power and the third lens with focal power sequentially arranged from object side to image side;At least one spacer element includes first spacer element, 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 effective focal length f1 of first lens, the distance EP01 between the end face of lens barrel closest to object side and the object side surface of first spacer element satisfy:-3.27≤f1 / EP01≤-1.93;The central thickness CT1 of first lens on the optical axis of optical lens, the maximum thickness CP1 of first spacer element, the on-axis distance SAG12 between the intersection of the image side surface of first lens and optical axis and the effective radius vertex of image side surface of first lens satisfy:1.46≤(CT1+CP1) / SAG12≤2.87.

[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 focal power, the second lens with positive focal power and the third lens with focal power sequentially arranged from object side to image side;At least one spacer element includes first spacer element, 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 effective focal length f1 of first lens, the distance EP01 between the end face of lens barrel closest to object side and the object side surface of first spacer element satisfy:-3.27≤f1 / EP01≤-1.93;The central thickness CT1 of first lens on the optical axis of optical lens, the maximum thickness CP1 of first spacer element, the on-axis distance SAG12 between the intersection of the image side surface of first lens and optical axis and the effective radius vertex of image side surface of first lens satisfy:1.46≤(CT1+CP1) / SAG12≤2.87.

[0009] Further, the inner diameter d0s of the end face of lens barrel closest to object side, the inner 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:-0.03≤(d0s-d1s) / R1≤1.68.

[0010] Further, the outer diameter of the end face of lens barrel closest to object side is less than the outer diameter of the end face of lens barrel closest to image side.

[0011] Further, the curvature radius R2 of the image side surface of first lens, the refractive index N1 of first lens and the inner diameter d1m of the image side surface of first spacer element satisfy:1.1≤(R2*N1) / d1m≤2.62.

[0012] Further, a central thickness CT1 of the first lens on an optical axis of the optical lens, a distance EP01 between an end surface of the lens barrel closest to an object side and an object side surface of the first spacer element satisfy: 1.82 ≤ EP01 / CT1 ≤ 3.25.

[0013] Further, a central thickness CT1 of the first lens on an optical axis of the optical lens, a maximum thickness CP1 of the first spacer element, an on-axis distance SAG12 between an intersection of an image side surface of the first lens and the optical axis to a vertex of an effective radius of the image side surface of the first lens satisfy: 1.46 ≤ (CT1+CP1) / SAG12 ≤ 2.87.

[0014] Further, a central thickness CT2 of the second lens on an optical axis of the optical lens, an on-axis distance SAG22 between an intersection of an image side surface of the second lens and the optical axis to a vertex of an effective radius of the image side surface of the second lens satisfy: 1.95 ≤ CT2 / |SAG22| ≤ 2.50.

[0015] Further, a central thickness CT1 of the first lens on an optical axis of the optical lens and a central thickness CT2 of the second lens on the optical axis satisfy: 2.19 ≤ CT2 / CT1 ≤ 2.86.

[0016] Further, a radius of curvature R6 of the image side surface of the third lens, a refractive index N3 of the third lens, an inner diameter d0m of an end surface of the lens barrel closest to an image side satisfy: 0.26 ≤ d0m / (R6*N3) ≤ 2.24.

[0017] Further, the at least one spacer element includes a second spacer element, the second spacer element being located between the second lens and the third lens and partially in contact with the image side surface of the second lens, wherein,

[0018] An outer diameter D2s of an object side surface of the second spacer element, a radius of curvature R4 of the image side surface of the second lens, and a refractive index N2 of the second lens satisfy: -3.06 ≤ D2s / (R4*N2) ≤ -1.83.

[0019] Further, an effective focal length f2 of the second lens and a separation EP12 between the first spacer element and the second spacer element satisfy: 1.41 ≤ f2 / EP12 ≤ 2.89.

[0020] Further, a maximum thickness CP2 of the second spacer element, a separation EP12 between the first spacer element and the second spacer element, and a central thickness CT2 of the second lens on an optical axis of the optical lens satisfy: 1.1 ≤ (CT2+CP2) / EP12 ≤ 3.01.

[0021] Further, the first lens has a negative refractive power and the second lens has a positive refractive power.

[0022] 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; and the image side surface of the third lens is a concave surface.

[0023] 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 positions of the three lenses and the first spacing element are arranged reasonably, and the optical lens is set to satisfy-3.27≤f1 / EP01≤-1.93, which is beneficial to reducing the size of the optical lens without affecting the imaging performance of the optical lens, and meets the requirement of miniaturization. However, the above parameters not only limit the imaging performance of the first lens, but also limit the distance EP01 between the end surface of the lens barrel closest to the object side and the object side surface of the first spacing element. When designing the optical lens, in order to meet the requirement of the imaging quality of the first lens, the performance of the first lens is usually prioritized at the expense of the thickness of the lens barrel, which leads to a small thickness of the lens barrel. The optical lens thus formed performs poorly in subsequent reliability experiments such as dropping, high temperature and humidity, mechanical impact and the like. It can be understood that, when the optical lens satisfies-3.27≤f1 / EP01≤-1.93, the reliability of the optical lens will be poor. In order to meet the requirement of miniaturization and improve the reliability of the optical lens, the optical lens also satisfies 0.63≤d1s / R2≤1.59. This setting makes the image side surface of the first lens a concave surface, provides more choices for the placement position of the first spacing element while ensuring the imaging performance of the first lens, makes the degree of freedom of the position of the first spacing element greater, limits the inner diameter d1s of the object side surface of the first spacing element, and can ensure the adhesion space between the image side surface of the first lens and the first spacing element, which is beneficial to improving the stability of the first lens and then appropriately reducing the edge thickness of the first lens without affecting the assembly of the optical lens. At the same time, more space can be allocated to the lens barrel to increase the thickness of the lens barrel, thereby improving the reliability of the optical lens. If d1s / R2 is less than 0.63, the adhesion space between the image side surface of the first lens and the first spacing element will be small, which affects the assembly of the optical lens. If d1s / R2 is greater than 1.59, the image side surface of the first lens will be too curved, which affects the molding of the first lens. Limiting d1s / R2 to the range of 0.63 to 1.59 can ensure the stability of the first lens while allocating more space to the lens barrel to increase the thickness of the lens barrel, thereby improving the reliability of the optical lens. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the application and are incorporated herein by reference. The embodiments illustrated in the drawings are intended to explain the present application and are not intended to limit the present application. In the drawings:

[0025] Figure 1 A size marking drawing of the optical lens of an optional embodiment of the present application is shown;

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

[0027] Figure 3 A structure schematic view of the optical lens of embodiment 1-2 of the present application is shown;

[0028] Figures 4 to 6 The on-axis chromatic aberration, the astigmatism curve and the magnification chromatic aberration curve of the optical lens of the embodiment one of the present application are shown respectively;

[0029] Figure 7 A structure schematic view of the optical lens of embodiment 2-1 of the present application is shown;

[0030] Figure 8 A structure schematic view of the optical lens of embodiment 2-2 of the present application is shown;

[0031] Figures 9 to 11 The on-axis chromatic aberration, the astigmatism curve and the magnification chromatic aberration curve of the optical lens of the embodiment two of the present application are shown respectively;

[0032] Figure 12 A structure schematic view of the optical lens of embodiment 3-1 of the present application is shown;

[0033] Figure 13 A structure schematic view of the optical lens of embodiment 3-2 of the present application is shown;

[0034] Figures 14 to 16 The on-axis chromatic aberration, the astigmatism curve and the magnification chromatic aberration curve of the optical lens of the embodiment three of the present application are shown respectively;

[0035] Figure 17 A structure schematic view of the optical lens of embodiment 4-1 of the present application is shown;

[0036] Figure 18 A structure schematic view of the optical lens of embodiment 4-2 of the present application is shown;

[0037] Figures 19 to 21 The on-axis chromatic aberration, the astigmatism curve and the magnification chromatic aberration curve of the optical lens of the embodiment four of the present application are shown respectively.

[0038] Among them, the above-mentioned drawings include the following figure marks:

[0039] 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; P2b, second auxiliary spacer element. DETAILED DESCRIPTION

[0040] 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 conjunction with the embodiments.

[0041] 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.

[0042] In the present application, unless otherwise specified, the orientation words such as "upper, lower, 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.

[0043] 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.

[0044] 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.

[0045] In the present disclosure, the paraxial region refers to a 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 skilled in the art. The convexity or concavity can be judged by the R value (R refers to the radius of curvature in the paraxial region, usually refers to the R value in the lens data of the optical software). For the object side surface, 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. For the image side surface, 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 the present application, the left side is the object side, and the right side is the image side.

[0046] In order to solve the problem that the optical lens in the prior art meets the miniaturization requirement and causes poor reliability, the utility model provides an optical lens.

[0047] As shown in Figures 1 to 21 The optical lens 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 sequence from an object side to an 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 is in contact with an image side surface of the first lens; wherein the effective focal length f1 of the first lens and the distance EP01 between the end surface of the lens barrel closest to the object side and the object side surface of the first spacing element satisfy: -3.27≤f1 / EP01≤-1.93; the inner diameter d1s of the object side surface of the first spacing element and the radius of curvature R2 of the image side surface of the first lens satisfy: 0.63≤d1s / R2≤1.59.

[0048] The optical lens of the present application is composed of a lens barrel, three lenses and at least one spacing element. By reasonably arranging the positions of the three lenses and the first spacing element and setting the optical lens to satisfy -3.27≤f1 / EP01≤-1.93, the imaging performance of the optical lens is not affected, and the size of the optical lens is reduced, meeting the requirement of miniaturization. However, the above parameters not only limit the imaging performance of the first lens, but also limit the distance EP01 between the end surface of the lens barrel closest to the object side and the object side surface of the first spacing element. In the design of the optical lens, in order to meet the requirements of the imaging quality of the first lens, the performance of the first lens is usually prioritized at the expense of the thickness of the lens barrel, resulting in a small thickness of the lens barrel. The optical lens thus formed performs poorly in subsequent reliability experiments such as drop, high temperature and humidity, mechanical impact and the like. It can be understood that when the optical lens satisfies -3.27≤f1 / EP01≤-1.93, the reliability of the optical lens will be poor.

[0049] In order to meet the miniaturization requirement while improving the reliability of the optical lens, the optical lens of the present application also meets: 0.63≤d1s / R2≤1.59. This setting makes the image side surface of the first lens concave, provides more choices for the placement position of the first spacing element while ensuring the imaging performance of the first lens, makes the freedom degree of the position of the first spacing element greater, limits the inner diameter d1s of the object side surface of the first spacing element at the same time, and can ensure the image side surface of the first lens and the adsorption space of the first spacing element, which is conducive to improving the stability of the first lens bearing, and then appropriately reducing the edge thickness of the first lens will not affect the assembly of the optical lens, at the same time, more space can be allocated to the lens barrel to increase the thickness of the lens barrel, thereby improving the reliability of the optical lens. If d1s / R2 is less than 0.63, the image side surface of the first lens and the adsorption space of the first spacing element will become smaller, which affects the assembly of the optical lens, and if d1s / R2 is greater than 1.59, the image side surface of the first lens is too curved, which affects the molding of the first lens. However, by limiting d1s / R2 to the range of 0.63 to 1.59, more space is allocated to the lens barrel while ensuring the stability of the first lens bearing, the thickness of the lens barrel is increased, and the reliability of the optical lens is improved.

[0050] In addition, with reference to the following Table 1 and Tables 16 to 18, Table 16 shows the field variation table of the optical lens after mechanical impact when f1 / EP01=-2.55 and d1s / R2=1.09, Table 17 shows the field variation table of the optical lens after mechanical impact when f1 / EP01=-2.55 and d1s / R2=0.5, and Table 18 shows the field variation table of the optical lens after mechanical impact when f1 / EP01=-2.55 and d1s / R2=1.7.

[0051] As can be seen from Tables 16 to 18, when d1s / R2=1.09 is satisfied, the change in field curvature obtained after the mechanical impact test is small, indicating that the mechanical impact has little effect on the optical lens, and the reliability of the optical lens performs better. When d1s / R2=0.5 is satisfied, the change in field curvature obtained after the mechanical impact test is larger, indicating that the mechanical impact has a greater effect on the optical lens, and the reliability of the optical lens performs worse. When d1s / R2=1.7 is satisfied, the change in field curvature obtained after the mechanical impact test is larger, indicating that the mechanical impact has a greater effect on the optical lens, and the reliability of the optical lens performs worse. As can be seen, when 0.63≤d1s / R2≤1.59 is in the range of 0.63 to 1.59, the reliability of the optical lens is best. Therefore, by restricting 0.63≤d1s / R2≤1.59, the relationship between the curvature radius of the image side of the first lens and the outer diameter of the first spacing element is reasonably restricted, the image side of the first lens and the adsorption space of the first spacing element can be guaranteed, the stability of the first lens can be improved, the edge thickness of the first lens can be appropriately reduced to allocate more space to the lens barrel, the thickness of the lens barrel can be improved, and thus the reliability of the optical lens is improved.

[0052]

[0053] Table 1

[0054] It should be noted that the present application limits d1s / R2 in the above range, optimizes the surface shape of the image side of the first lens and the size of the first spacing element, optimizes the bearing area between the first lens and the first spacing element and the structural strength of the first lens, to improve the stability of the first lens bearing, while guaranteeing the imaging performance of the first lens, to provide more choices for the placement position of the first spacing element, to facilitate the design freedom of the barrel wall thickness of the front end of the lens barrel, and thus to achieve the purpose of improving the reliability of the optical lens. The reliability is not dependent on the focal power of the lens and the surface shape of other lenses, and the focal power and surface shape of other lenses are further optimized on this basis. The other lenses can be positive or negative according to the actual design requirements of the optical system, and the surface shape of the other lenses can be convex or concave according to the design requirements of the optical system. As long as the optical system satisfies -3.27≤f1 / EP01≤-1.93; 0.63≤d1s / R2≤1.59, the miniaturization requirement can be met while the reliability of the optical lens is guaranteed.

[0055] For example, the first lens has negative refractive power, and the second lens has positive refractive power. For another example, 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 optical lens can be simulated by software and / or tools such as ZEMAX, CODEV, and the like. Preferably, the optical lens is 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 the tool used and appropriately adjusted.

[0056] In some optional embodiments, the inner diameter d0sof the end surface of the lens barrel closest to the object side, the inner diameter d1sof the object-side surface of the first spacer element, and the radius of curvature R1of the object-side surface of the first lens satisfy: -0.03≤(d0s-d1s) / R1≤1.68. By limiting (d0s-d1s) / R1in the above range, the matching degree of the first lens and the lens barrel is improved while ensuring that the optical lens meets the miniaturization and improves the reliability, which is conducive to controlling the incident angle of light, so that the optical lens in the embodiment has the characteristics of a large field of view. The optical lens in the embodiment can be applied to VR and AR devices that require the optical lens to be miniaturized and have a large field of view, to provide a wide and clear field of view for VR and AR, and thus improve the immersive experience of the user.

[0057] In addition, limiting (d0s-d1s) / R1in the above range limits the inner diameter d0sof the end surface of the lens barrel closest to the object side and the radius of curvature R1of the object-side surface of the first lens, to ensure the gap between the object-side surface of the first lens and the barrel wall of the lens barrel, to ensure the stability of the first lens group, to improve the stability of the optical lens in the reliability test, and to further improve the reliability of the optical lens.

[0058] In some optional embodiments, the diaphragm is located between the first lens and the second lens. By limiting (d0s-d1s) / R1in the above range, it is helpful to ensure that the optical lens optimizes the diaphragm aperture size while maintaining sufficient field of view and imaging area, thereby improving the luminous flux of the optical lens and further improving the relative luminance of the optical lens. High relative luminance means that the optical lens can capture more light under the same light, which is particularly important for imaging in low-light environments, and can significantly improve the imaging performance in low-light conditions and improve the brightness and details of the image.

[0059] In some optional embodiments, the outer diameter of the end of the lens barrel closest to the object side is smaller than the outer diameter of the end of the lens barrel closest to the image side. This design ensures the assembly sequence of the lens, i.e., the lens is inserted into the lens barrel from the object side to the image side, which helps to simplify the assembly process and reduce the decline in optical performance caused by improper assembly sequence. The smaller outer diameter on the object side also means that the front end of the lens barrel has a certain taper design, so that the head of the optical lens is smaller, which is convenient for adapting to electronic devices, while ensuring the difference in outer diameter between the two ends of the lens barrel, which is conducive to ensuring the feasibility of the molding of the lens barrel.

[0060] 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 d1m of the image side surface of the first spacer element satisfy: 1.1≤(R2*N1) / d1m≤2.62. By limiting (R2*N1) / d1m within the above range, it is ensured that the imaging light can smoothly pass through the first spacer element after the light passes out of the image side surface of the first lens, while it is also conducive to the convergence of the light at the stop aperture position, thereby improving the imaging clarity and focusing performance. At the same time, by controlling the relationship between the radius of curvature of the image side surface of the first lens and the refractive index and the size of the first spacer element, the path of the light between the first lens and the first spacer element can be optimized, reducing internal reflection and thus reducing the generation of stray light, thereby ensuring the imaging quality of the optical lens.

[0061] In some optional embodiments, the center thickness CT1 of the first lens on the optical axis of the optical lens, and the distance EP01 between the end of the lens barrel closest to the object side and the object side surface of the first spacer element satisfy: 1.82≤EP01 / CT1≤3.25. By limiting EP01 / CT1 within the above range, the molding of the first lens is ensured while reducing the reflection of light between the edge of the first lens and the inner wall of the lens barrel, avoiding the formation of additional spots and reducing stray light.

[0062] In addition, in some optional embodiments, the optical lens simultaneously satisfies: -3.27≤f1 / EP01≤-1.93, 1.82≤EP01 / CT1≤3.25, which can effectively control the degree of deflection of the light at the first lens, while it is also conducive to controlling the ratio of the center thickness to the edge thickness of the first lens, reducing the edge thickness while ensuring the molding of the first lens, so as to improve the wall thickness of the lens barrel and further increase the reliability of the optical lens.

[0063] In some alternative embodiments, the center thickness CT1 of the first lens on the optical axis of the optical lens, the maximum thickness CP1 of the first spacer element, and the on-axis distance SAG12 between the intersection of the image side surface of the first lens and the optical axis and the effective radius vertex of the image side surface of the first lens satisfy: 1.46≤(CT1+CP1) / SAG12≤2.87. Limiting (CT1+CP1) / SAG12 within the above range ensures the processability of the first lens, avoids the mismatch between the center thickness of the first lens and the sagittal height of the image side surface of the first lens, and causes forming problems such as flow marks in the process of forming the first lens. At the same time, limiting the center thickness of the first lens and the thickness of the first spacer element ensures the processability of the first lens and the bearing strength of the first spacer element to the first lens, thereby improving the reliability of the optical lens. In addition, limiting (CT1+CP1) / SAG12 within the above range is conducive to controlling the refraction angle of light in the first lens and when the light is emitted from the first lens, and is conducive to reducing stray light reflected by the first spacer element, thereby improving the imaging quality of the optical lens.

[0064] In some alternative embodiments, the center thickness CT2 of the second lens on the optical axis of the optical lens, and the on-axis distance SAG22 between the intersection of the image side surface of the second lens and the optical axis and the effective radius vertex of the image side surface of the second lens satisfy: 1.95≤CT2 / |SAG22|≤2.50. Controlling CT2 / |SAG22| within a reasonable range ensures the processability of the second lens, and is conducive to controlling the refraction degree of light in the second lens and reducing the generation of stray light.

[0065] In some alternative embodiments, the center thickness CT1 of the first lens on the optical axis of the optical lens and the center thickness CT2 of the second lens on the optical axis satisfy: 2.19≤CT2 / CT1≤2.86. By limiting the center thickness of the first lens and the second lens within the above range, the gap between the first lens and the second lens is controlled within a reasonable range, which helps to reduce the change of optical performance caused by thermal expansion and contraction, and enhances the stability and reliability of the optical lens under different temperature conditions.

[0066] In some optional embodiments, a relationship among a radius of curvature R6 of an image-side surface of the third lens, a refractive index N3 of the third lens, and an inner diameter d0m of the end surface of the lens barrel closest to the image side satisfies 0.26≤d0m / (R6*N3)≤2.24. Limiting d0m / (R6*N3) within the above range can control the inner diameter of the end surface of the lens barrel closest to the image side and the size of the third lens, facilitate miniaturization of the optical lens, and control the folding ability of the image-side surface of the third lens, ensuring smooth transition of the light rays in the inner diameter range of the end surface of the lens barrel closest to the image side, avoiding excessive folding of the light rays, and facilitating improvement of the clarity and contrast of the imaging. In addition, by limiting d0m / (R6*N3), the light rays exiting the image-side surface of the third lens can enter the inner diameter range of the end surface of the lens barrel closest to the image side, optimizing the light ray path, facilitating reduction of light reflection between the third lens and the lens barrel, reducing the generation of optical ghost images, especially reducing the energy threshold of the ghost images, and facilitating improvement of the imaging quality of the optical lens.

[0067] In some optional embodiments, the at least one spacing element includes a second spacing element located between the second lens and the third lens and in contact with the image-side surface of the second lens, and a relationship among an outer diameter D2s of the object-side surface of the second spacing element, a radius of curvature R4 of the image-side surface of the second lens, and a refractive index N2 of the second lens satisfies -3.06≤D2s / (R4*N2)≤-1.83. Limiting D2s / (R4*N2) within the above range can effectively control the bending degree of the image-side surface of the second lens, ensure that the second lens can maintain a predetermined curvature shape during molding, avoid optical performance degradation due to excessive bending, and ensure that the image-side surface of the second lens has a sufficient bearing width with the second spacing element to bear the second lens and prevent the lens from being offset during assembly, thereby maintaining the overall assembly stability of the optical lens.

[0068] In some optional embodiments, a relationship among an effective focal length f2 of the second lens and a spacing EP12 between the first spacing element and the second spacing element satisfies 1.41≤f2 / EP12≤2.89. Limiting f2 / EP12 within the above range can ensure the light folding performance of the second lens while taking into account the structural strength of the second lens. This helps to achieve a balance between high-performance transmission and high reliability of the optical lens, so that the optical lens not only performs well in optical performance, but also can maintain stability under various use conditions, prolonging the service life of the lens. In addition, limiting f2 / EP12 within the above range also facilitates molding of the second lens.

[0069] In some optional embodiments, the maximum thickness CP2 of the second spacer element, the interval EP12 between the first spacer element and the second spacer element, and the central thickness CT2 of the second lens on the optical axis of the optical lens satisfy: 1.1≤(CT2+CP2) / EP12≤3.01. Limiting (CT2+CP2) / EP12 within the above range reduces the difference between the central thickness and the edge thickness of the second lens, ensures the uniformity of the thickness of the second lens, improves the processability of the second lens, avoids defects such as cracks and flow marks during the forming of the second lens, ensures the yield of the second lens, and at the same time can ensure that the second lens and the second spacer element remain stable in structure and are not easy to displace or deform when subjected to mechanical impact or environmental changes such as high temperature, low temperature, and dropping, thereby improving the reliability of the optical lens. In addition, the parameter optimizes the space occupied by the second lens in the lens barrel, which is conducive to forming a compact optical system and is conducive to the miniaturization of the optical lens.

[0070] According to another aspect of the present application, an optical lens is also provided, which comprises 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 comprise, in order from the object side to the image side, a first lens with negative optical power, a second lens with positive optical power, and a third lens with optical power. The at least one spacer element comprises a first spacer element. The first spacer element is located between the first lens and the second lens and is in contact with the image side surface of the first lens. The effective focal length f1 of the first lens and the distance EP01 between the end surface of the lens barrel closest to the object side and the object side surface of the first spacer element satisfy: -3.27≤f1 / EP01≤-1.93. The central thickness CT1 of the first lens on the optical axis of the optical lens, the maximum thickness CP1 of the first spacer element, and the on-axis distance SAG12 between the intersection of the image side surface of the first lens and the optical axis and the effective radius vertex of the image side surface of the first lens satisfy: 1.46≤(CT1+CP1) / SAG12≤2.87.

[0071] The optical lens of the present application is composed of a lens barrel, three lenses and at least one spacing element. By reasonably arranging the positions of the three lenses and the first spacing element and setting the optical lens to satisfy -3.27≤f1 / EP01≤-1.93, the imaging performance of the optical lens is not affected, and the size of the optical lens is reduced, meeting the miniaturization requirement. However, the above parameters not only limit the imaging performance of the first lens, but also limit the distance EP01 between the end face of the lens barrel closest to the object side and the object side face of the first spacing element. When designing the optical lens, in order to meet the requirements of the imaging quality of the first lens, the performance of the first lens is usually prioritized at the expense of the thickness of the lens barrel, resulting in a small thickness of the lens barrel. The optical lens formed in this way performs poorly in subsequent reliability experiments such as drop, high temperature and humidity, mechanical impact, etc. It can be understood that when the optical lens satisfies -3.27≤f1 / EP01≤-1.93, the reliability of the optical lens will be poor. In order to meet the miniaturization requirement while improving the reliability of the optical lens, the optical lens of the present application also satisfies 1.46≤(CT1+CP1) / SAG12≤2.87. By limiting (CT1+CP1) / SAG12 within the above range, the machinability of the first lens is ensured, and the mismatch between the center thickness of the first lens and the sag of the image side face of the first lens is avoided, which causes forming problems such as flow marks in the forming process of the first lens. At the same time, the center thickness of the first lens and the thickness of the first spacing element are limited, which ensures the machinability of the first lens and the bearing strength of the first spacing element to the first lens, thereby improving the reliability of the optical lens.

[0072] In addition, by limiting (CT1+CP1) / SAG12 within the above range, it is beneficial to control the deflection angle of light when it passes through the first lens and is emitted from the first lens, which is beneficial to reduce the stray light reflected by the first spacing element, and thereby improves the imaging quality of the optical lens.

[0073] According to the optical lens, the inner diameter d0s of the end surface closest to the object side of the lens barrel and the outer diameter D2s of the object side surface of the second spacer element are similar in size, and thus the size of the front end of the lens barrel is similar to the size of the rear end, which is beneficial to miniaturization of the optical lens.

[0074] The optical lens of the present application is composed of a lens barrel, three lenses and at least one spacer element. By reasonably arranging the positions of the three lenses and the first spacer element and setting the optical lens to satisfy 0.59≤d0s / D2s≤0.96, the inner diameter d0s of the end surface closest to the object side of the lens barrel is similar in size to the outer diameter D2s of the object side surface of the second spacer element, and thus the size of the front end of the lens barrel is similar to the size of the rear end, which is beneficial to miniaturization of the optical lens. However, this may cause the light to be easily deflected to the inner wall of the lens barrel or the optical structure area of the lens when propagating between the lenses, resulting in serious stray light. In order to reduce the generation of stray light in the optical lens, the present application restricts R4*N2 / (D2S-d2s) within a reasonable range to adjust the deflection degree of the light when the light exits the second lens, optimizes the exit angle of the image side light of the second lens, ensures that the light will not be deflected at a large angle, reduces the generation of stray light, ensures that the second spacer 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.

[0075] Of course, the present embodiment can also include other parameter formulas in the above embodiments, which will not be described here.

[0076] Optionally, the optical lens can also include a protective glass for protecting the photosensitive element located on the imaging surface.

[0077] 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 lens surfaces of each lens is an aspherical surface. The aspherical lens has the characteristic that the curvature continuously changes 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, which has the advantages of improving the distortion aberration and improving the astigmatism aberration. After using the aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality.

[0078] In some optional embodiments, the multiple lenses described above can have at least one cut lens, the outer periphery of the cut lens can have a cut edge part and a non-cut edge part, and the outer diameter of the cut edge part of the lens is smaller than the outer diameter of the non-cut edge part of the lens. When the outer periphery of the lens has a cut edge part, the outer diameter of the lens usually refers to the outer diameter of the non-cut edge part of the lens.

[0079] In some optional embodiments, the multiple spacing elements described above can have at least one cut spacing element. The outer periphery of the cut spacing element can have a cut edge part and a non-cut edge part, and the outer diameter of the cut edge part of the cut spacing element is smaller than the outer diameter of the non-cut edge part of the cut spacing element. The outer diameter of the spacing element usually refers to the maximum outer diameter that is not cut by the cut edge part.

[0080] 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 specification. For example, although three lenses are described as an example in the embodiments, the optical lens is not limited to including three lenses. If necessary, the optical lens can also include other numbers of lenses.

[0081] Figure 1 The size annotation diagram of one optical lens of the present application is shown, Figure 1 The parameters d1s, d1m, D2s, D2m, d0s, d0m, CP1, CP2, EP01, EP12, 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 type of the specific lens, these parameters will not be embodied in the figure when the specific embodiments are described later.

[0082] The specific surface type and parameters of the optical lens applicable to the above-mentioned embodiments are further described below with reference to the drawings.

[0083] It should be noted that there are two examples of Example 1-1, Example 1-2 in the following Example One, two examples of Example 2-1, Example 2-2 in Example Two, two examples of Example 3-1, Example 3-2 in Example Three, and two examples of Example 4-1, Example 4-2 in Example Four. The curvature radius, center thickness and other parameters of the first lens to the third lens of the optical lens in the two examples in the same example 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 to say, the main structure for imaging is the same, and the auxiliary structure for imaging is different.

[0084] It should be noted that any one example in the following Example One to Example Four is applicable to all examples of the present application.

[0085] Example One

[0086] As shown in Figures 2 to 6 , the optical lens of Example One is described. Figure 2 The structural schematic diagram of the optical lens of Example 1-1 is shown, Figure 3 The structural schematic diagram of the optical lens of Example 1-2 is shown.

[0087] As shown in Figure 2 and Figure 3 , the optical lens includes a lens barrel P0, three lenses and multiple spacing elements, the lens barrel P0 includes a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a second auxiliary spacing element P2b and a third lens E3 arranged in order from the object side to the image side.

[0088] As shown in Figure 2 , the structural schematic diagram of the optical lens of Example 1-1 is shown. In this example, the object side end of the lens barrel has a bearing protrusion extending to the central axis of the lens barrel, and the object side surface S1 of the first lens abuts against the bearing protrusion of the lens barrel P0. The object side surface and the image side surface of the first spacing element P1 partially 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 spacing element P2 partially abut against the image side surface S4 of the second lens and the object side surface of the second auxiliary spacing element P2b respectively, and the image side surface of the second auxiliary spacing element P2b partially abuts against the object side surface S5 of the third lens.

[0089] As shown in Figure 3 , the structural schematic diagram of the optical lens of Example 1-2 is shown. In this example, the bearing abutting mode of each spacing element is the same as that of Example 1-1, and the relevant description in Example 1-1 can be referred to, which will not be repeated here.

[0090] The structure parameters of the optical lens in Example 1-1 and Example 1-2 are shown in Table 2 (unit: mm).

[0091]

[0092] Table 2

[0093] In Example 1, 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 convex. The object side S5 of the third lens is convex, and the image side S6 of the third lens is concave. S7 to S10 in Table 3 below can be the surface of the filter and the protective glass, and S11 is the imaging surface, and STO is the diaphragm, which is not shown in the figure.

[0094] In Example 1, the effective focal length f1 of the first lens is -0.90 mm, the effective focal length f2 of the second lens is 0.56 mm, the effective focal length f3 of the third lens is -6.07 mm, the on-axis distance SAG12 between the intersection of the image side of the first lens and the optical axis and the effective radius vertex of the image side of the first lens is 0.09 mm, and the on-axis distance SAG22 between the intersection of the image side of the second lens and the optical axis and the effective radius vertex of the image side of the second lens is -0.21 mm.

[0095] Table 3 shows the basic structure parameter table of the optical lens in Example 1, wherein the units of the curvature radius and the thickness / distance are all millimeters.

[0096]

[0097] Table 3

[0098] In Example 1, 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 the following aspheric formula, but is not limited thereto:

[0099] Formula (1)

[0100] wherein x is the distance vector 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 curvature radius R in Table 1; k is the conic coefficient; and Ai is the correction coefficient of the i-th order of the aspheric surface. Table 4 below shows the high-order coefficient A4, A6, A8, A10, A12, A14, A16, A18, A20 which can be used for each aspheric surface S1-S6 in Example 1.

[0101]

[0102] Table 4

[0103] Figure 4 The axial chromatic aberration curve of the optical lens of embodiment one is shown, which represents the convergence point deviation of light rays of different wavelengths after passing through the optical lens. Figure 5 The astigmatism curve of the optical lens of embodiment one is shown, which represents the meridional image curvature and sagittal image curvature. Figure 6 The lateral chromatic aberration curve of the optical lens of embodiment one is shown, which represents the deviation of light rays on the imaging plane after passing through the lens at different image heights.

[0104] According to Figures 4 to 6 It can be seen that the optical lens given by embodiment one can achieve good imaging quality.

[0105] Embodiment two

[0106] As Figures 7 to 11 shown, the optical lens of embodiment two is described. Figure 7 The structural schematic diagram of the optical lens of embodiment 2-1 is shown, Figure 8 The structural schematic diagram of the optical lens of embodiment 2-2 is shown.

[0107] As Figure 7 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.

[0108] The optical lens shown in Figure 8 has the same number of lenses as the optical lens shown in Figure 7 but different number of spacer elements, and the optical lens shown in Figure 8 further includes a second auxiliary spacer element P2b, wherein the second auxiliary spacer element P2b is located between the second spacer element P2 and the third lens E3.

[0109] As Figure 7 shown, the structural schematic diagram of the optical lens of embodiment 2-1 is shown. In this example, the object side end of the lens barrel has a bearing convex protrusion extending to the central axis of the lens barrel, and the object side surface S1 of the first lens abuts against the bearing convex protrusion of the lens barrel P0. The object side surface and the image side surface of the first spacer element P1 partially 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 partially abut against the image side surface S4 of the second lens and the object side surface S5 of the third lens, respectively.

[0110] As Figure 8Fig. 2 shows a structural schematic diagram of the optical lens of Example 2-2. In this example, the abutting mode of each spacer element is similar to that of Example 2-1, and the relevant description in Example 2-1 can be referred to, which will not be repeated here. The difference is the abutting mode of the second spacer element P2 and the third lens E3 position, which is shown in Figure 8 In the optical lens shown, the image side surface of the second spacer element P2 partially abuts with the object side surface of the second auxiliary spacer element P2b, and the image side surface of the second auxiliary spacer element P2b partially abuts with the object side surface S5 of the third lens.

[0111] In summary, the structural parameters of the optical lens of Example Two under Example 2-1 and Example 2-2 are shown in Table 5. (unit: mm)

[0112]

[0113] Table 5

[0114] In Example Two, the object side surface S1 of the first lens is a convex surface, and the image side surface S2 of the first lens is a concave surface. The object side surface S3 of the second lens is a concave surface, and the image side surface S4 of the second lens is a convex 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 concave surface.

[0115] In Example Two, the effective focal length f1 of the first lens is -1.29 mm, the effective focal length f2 of the second lens is 0.72 mm, the effective focal length f3 of the third lens is 11.09 mm, the axial distance SAG12 between the intersection of the image side surface of the first lens and the optical axis and the effective radius vertex of the image side surface of the first lens is 0.09 mm, and the axial distance SAG22 between the intersection of the image side surface of the second lens and the optical axis and the effective radius vertex of the image side surface of the second lens is -0.19 mm.

[0116] Table 6 shows the basic structural parameter table of the optical lens of Example Two, wherein the units of the curvature radius and the thickness / distance are all millimeters.

[0117]

[0118] Table 6

[0119] The following Table 7 gives the high-order term coefficients A4, A6, A8, A10, A12, A14, A16 of the aspherical surfaces S1-S6 that can be used in Example Two. Among them, each aspherical surface can be defined by the formula (1) given in the above Example One.

[0120]

[0121] Table 7

[0122] Figure 9An on-axis 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 An astigmatism curve of the optical lens of Embodiment Two is shown, which represents the meridional image curvature and sagittal image curvature. Figure 11 A lateral chromatic aberration curve of the optical lens of Embodiment Two is shown, which represents the deviation of light rays on different image heights after passing through the lens.

[0123] According to Figures 9 to 11 It can be seen that the optical lens of Embodiment Two can achieve good imaging quality.

[0124] Embodiment Three

[0125] As Figures 12 to 16 shown, the optical lens of Embodiment Three is described. Figure 12 A structural schematic diagram of the optical lens of Embodiment 3-1 is shown, Figure 13 A structural schematic diagram of the optical lens of Embodiment 3-2 is shown.

[0126] As 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 second auxiliary spacer element P2b, and a third lens E3.

[0127] The optical lens shown in Figure 13 has the same number of lenses and different number of spacer elements as the optical lens shown in Figure 12 , and in the optical lens shown in Figure 13 , there is no second auxiliary spacer element P2b, wherein the second spacer element P2 abuts against the third lens E3.

[0128] As Figure 12 shown, a structural schematic diagram of the optical lens of Embodiment 3-1 is shown. In this example, the object side end of the lens barrel has an abutting protrusion extending to the central axis of the lens barrel, and the object side surface S1 of the first lens abuts against the abutting protrusion of the lens barrel P0. The object side surface and the image side surface of the first spacer element P1 partially 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 partially abut against the image side surface S4 of the second lens and the object side surface of the second auxiliary spacer element P2b, respectively, and the image side surface of the second auxiliary spacer element P2b partially abuts against the object side surface S5 of the third lens.

[0129] As Figure 13Fig. 3 shows a schematic diagram of the structure of the optical lens of Example 3-2. In this example, the abutting mode of each spacer element is similar to that of Example 3-1, and reference can be made to the relevant description in Example 3-1, which will not be repeated here. The difference is that there is no second auxiliary spacer element P2b in this example, and the object side S5 of the second spacer element P2 partially abuts the object side of the third lens.

[0130] 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).

[0131]

[0132] Table 8

[0133] 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 convex. The object side S5 of the third lens is convex, and the image side S6 of the third lens is concave.

[0134] In Example Three, the effective focal length f1 of the first lens is -0.96 mm, the effective focal length f2 of the second lens is 0.59 mm, the effective focal length f3 of the third lens is -6.09 mm, the on-axis distance SAG12 between the intersection of the image side of the first lens and the optical axis and the effective radius vertex of the image side of the first lens is 0.12 mm, and the on-axis distance SAG22 between the intersection of the image side of the second lens and the optical axis and the effective radius vertex of the image side of the second lens is -0.20 mm.

[0135] 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 all millimeters.

[0136]

[0137] Table 9

[0138] 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. Among them, each aspherical surface can be defined by the formula (1) given in Example One above.

[0139]

[0140] Table 10

[0141] Figure 14 Fig. 4 shows the on-axis chromatic aberration curve of the optical lens of Example Three, which represents the deviation of the converging focal points of light rays of different wavelengths after passing through the optical lens. Figure 15Astigmatism curves of the optical lens of embodiment three are shown, which represent meridional image curvature and sagittal image curvature. Figure 16 Aberration curves of the optical lens of embodiment three are shown, which represent deviation of light rays via the lens at different image heights on the imaging plane.

[0142] According to Figures 14 to 16 It can be seen that the optical lens given by embodiment three can achieve good imaging quality.

[0143] Embodiment four

[0144] As Figures 17 to 21 shown, the optical lens of embodiment four is described. Figure 17 A structural schematic diagram of the optical lens of embodiment 4-1 is shown, Figure 18 A structural schematic diagram of the optical lens of embodiment 4-2 is shown.

[0145] As Figure 17 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 second auxiliary spacer element P2b and a third lens E3.

[0146] The optical lens shown in Figure 18 is different from the optical lens shown in Figure 12 in the number of lenses and the number of spacer elements, in the optical lens shown in Figure 13 there is no second auxiliary spacer element P2b, wherein the second spacer element P2 abuts against the third lens E3.

[0147] As Figure 17 shown, a structural schematic diagram of the optical lens of embodiment 4-1 is shown. In this example, the object side end of the lens barrel has an abutting protrusion extending to the central axis of the lens barrel, and the object side surface S1 of the first lens abuts against the abutting protrusion of the lens barrel P0. The object side surface and the image side surface of the first spacer element P1 partially 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 partially abut against the image side surface S4 of the second lens and the object side surface of the second auxiliary spacer element P2b, respectively, and the image side surface of the second auxiliary spacer element P2b partially abuts against the object side surface S5 of the third lens.

[0148] As Figure 18Fig. 4-2 shows a schematic diagram of the optical lens of Example 4-2. In this example, the abutting mode of each spacer element is similar to that of Example 4-1, and the relevant description in Example 4-1 can be referred to, which will not be repeated here. The difference is that there is no second auxiliary spacer element P2b in this example, and the object side S5 of the second spacer element P2 partially abuts the object side of the third lens.

[0149] In summary, the structural parameters of the optical lens of Example 4 in Examples 4-1 and 4-2 are shown in Table 11 (unit: mm).

[0150]

[0151] Table 11

[0152] In Example 4, the object side S1 of the first lens is concave, 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 convex. The object side S5 of the third lens is convex, and the image side S6 of the third lens is concave.

[0153] In Example 4, the effective focal length f1 of the first lens is -1.05 mm, the effective focal length f2 of the second lens is 0.58 mm, the effective focal length f3 of the third lens is -3.33 mm, the axial distance SAG12 between the intersection of the image side of the first lens and the optical axis and the effective radius vertex of the image side of the first lens is 0.06 mm, and the axial distance SAG22 between the intersection of the image side of the second lens and the optical axis and the effective radius vertex of the image side of the second lens is -0.20 mm.

[0154] Table 12 shows the basic structural parameter table of the optical lens of Example 4, wherein the units of the curvature radius and the thickness / distance are millimeters.

[0155]

[0156] Table 12

[0157] The following Table 13 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 4. Among them, each aspherical surface can be defined by the formula (1) given in Example 1 above.

[0158]

[0159] Table 13

[0160] Figure 19 Fig. 4-3 shows the axial chromatic aberration curve of the optical lens of Example 4, which represents the deviation of the converging focal points of light rays of different wavelengths after passing through the optical lens. Figure 20Astigmatism curves of the optical lens of embodiment four are shown, which represent meridional image surface curvature and sagittal image surface curvature. Figure 21 Aberration curves of the optical lens of embodiment four are shown, which represent deviation of light rays via the lens at different image heights on the imaging plane.

[0161] According to Figures 19 to 21 It can be seen that the optical lens given by embodiment four can achieve good imaging quality.

[0162] In summary, the optical lenses of embodiments one to four respectively satisfy the relationships shown in table 14.

[0163]

[0164] Table 14

[0165] Table 15 shows the effective focal length (unit: mm) of each lens of the optical lenses of embodiments one to four.

[0166]

[0167] Table 15

[0168] The present application also provides an imaging device, and the electronic photosensitive element thereof can be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The imaging device can be a separate imaging equipment 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.

[0169] Table 16 is a change table of the field area of the optical lens in an optional embodiment of the present application after mechanical impact.

[0170]

[0171] Table 16

[0172] Table 17 is a change table of the field area of the optical lens in an example of the present application after mechanical impact.

[0173]

[0174] Table 17

[0175] Table 18 is a change table of the field area of the optical lens in another example of the present application after mechanical impact.

[0176]

[0177] Table 18

[0178] 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 of the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the present application.

[0179] It is to be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, devices, components and / or combinations thereof, but do not preclude the presence or addition of one or more other features, steps, operations, devices, components and / or combinations thereof.

[0180] It should be noted that the terms "first", "second", and the like, used in the specification and the claims of the application, as well as above-described accompanying drawings, are used to distinguish similar objects, and do not necessarily indicate 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 application described herein can be implemented in an order other than those illustrated or described herein.

[0181] The above only describes the 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 optical lens barrel comprises 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 comprise a first lens, a second lens and a third lens arranged in order from an object side to an image side; The at least one spacer element comprises a first spacer element, the first spacer element is located between the first lens and the second lens and is in contact with an image side surface portion of the first lens; Wherein, the effective focal length f1 of the first lens, the distance EP01 between the end face of the lens barrel closest to the object side and the object side surface of the first spacer element satisfy: -3.27≤f1 / EP01≤-1.93; The inner diameter d1s of the object side surface of the first spacer element and the curvature radius R2 of the image side surface of the first lens satisfy: 0.63≤d1s / R2≤1.

59.

2. The optical lens of claim 1, wherein, The inner diameter d0s of the end face of the lens barrel closest to the object side, the inner diameter d1s of the object side surface of the first spacer element and the curvature radius R1 of the object side surface of the first lens satisfy: -0.03≤(d0s-d1s) / R1≤1.

68.

3. The optical lens of claim 1, wherein, The outer diameter of the end face of the lens barrel closest to the object side is smaller than the outer diameter of the end face of the lens barrel closest to the image side.

4. The optical lens of 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 d1m of the image side surface of the first spacer element satisfy: 1.1≤(R2*N1) / d1m≤2.

62.

5. The optical lens of claim 1, wherein, The central thickness CT1 of the first lens on the optical axis of the optical lens barrel, the distance EP01 between the end face of the lens barrel closest to the object side and the object side surface of the first spacer element satisfy: 1.82≤EP01 / CT1≤3.

25.

6. The optical lens of claim 1, wherein, The central thickness CT1 of the first lens on the optical axis of the optical lens barrel, the maximum thickness CP1 of the first spacer element, the on-axis distance SAG12 between the intersection of the image side surface of the first lens and the optical axis and the effective radius vertex of the image side surface of the first lens satisfy: 1.46≤(CT1+CP1) / SAG12≤2.

87.

7. The optical lens of claim 1, wherein, The central thickness CT2 of the second lens on the optical axis of the optical lens barrel, the on-axis distance SAG22 between the intersection of the image side surface of the second lens and the optical axis and the effective radius vertex of the image side surface of the second lens satisfy: 1.95≤CT2 / |SAG22|≤2.

50.

8. The optical lens of claim 1, wherein, The central thickness CT1 of the first lens on the optical axis of the optical lens barrel and the central thickness CT2 of the second lens on the optical axis satisfy: 2.19≤CT2 / CT1≤2.

86.

9. The optical lens of claim 1, wherein, The curvature radius R6 of the image side surface of the third lens, the refractive index N3 of the third lens and the inner diameter d0m of the end face of the lens barrel closest to the image side satisfy: 0.26≤d0m / (R6*N3)≤2.

24.

10. The optical lens of claim 1, wherein, The at least one spacer element further comprises a second spacer element, the second spacer element is located between the second lens and the third lens and is in contact with an image side surface portion of the second lens, wherein, An outer diameter D2s of an object side surface of the second spacer element, a radius of curvature R4 of an image side surface of the second lens, and a refractive index N2 of the second lens satisfy: -3.06 ≤ D2s / (R4*N2) ≤ -1.

83.

11. The optical lens of claim 10, wherein, An effective focal length f2 of the second lens and a separation EP12 between the first spacer element and the second spacer element satisfy: 1.41 ≤ f2 / EP12 ≤ 2.

89.

12. The optical lens of claim 10, wherein, A maximum thickness CP2 of the second spacer element, the separation EP12 between the first spacer element and the second spacer element, and a central thickness CT2 of the second lens on an optical axis of the optical lens satisfy: 1.1 ≤ (CT2+CP2) / EP12 ≤ 3.

01.

13. The optical lens of any of claims 1 to 12, wherein, The first lens has a negative refractive power, and the second lens has a positive refractive power.

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

Images