Optical lens

Abstract

The invention provides an optical lens. 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, and the three lenses comprise a first lens, a second lens and a third lens which are sequentially arranged from the object side to the 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 invention, the problem of poor reliability caused by the fact that an optical lens in the prior art meets the miniaturization requirement is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of optical imaging equipment, and in particular to an optical lens. Background Art

[0002] With the continuous advancement of technology, optical lenses are gradually installed in various electronic devices, such as mobile phones, tablets and laptops, as well as industrial cameras, smart cameras, smart IoT devices, robots, unmanned aerial vehicles (UAVs) and intelligent driving systems. Different electronic devices have different requirements for optical lenses. For some electronic devices, optical lenses are required to be miniaturized while meeting the requirements of imaging.

[0003] Typically, miniaturized optical lenses have a small head to reduce the opening area of ​​electronic equipment. In some cases, in order to ensure that the imaging quality of the optical lens is not affected while ensuring that the optical lens has a small head, the wall thickness of the object side of the lens barrel is reduced, which results in a smaller lens barrel thickness and poor reliability.

[0004] That is to say, the optical lens in the prior art has the problem of poor reliability due to the requirement of miniaturization. Summary of the invention

[0005] The main purpose of the present invention is to provide an optical lens to solve the problem that the optical lens in the prior art meets the requirement of miniaturization but leads to poor reliability.

[0006] To achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided an optical lens, comprising a lens barrel, three lenses and at least one spacer element, wherein the three lenses and the at least one spacer element are arranged in the lens barrel, the three lenses comprising a first lens, a second lens and a third lens arranged in sequence from the object side to the image side; the at least one spacer element 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 portion of the first lens; wherein the effective focal length f1 of the first lens, 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 the following conditions: -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 the following conditions: 0.63≤d1s / R2≤1.59.

[0007] According to another aspect of the present invention, an optical lens is also provided, comprising a lens barrel, three lenses and at least one spacer element, wherein the three lenses and the at least one spacer element are arranged in the lens barrel, wherein the three lenses comprise a first lens with negative optical power, a second lens with positive optical power and a third lens with optical power, which are arranged in sequence from the object side to the image side; wherein the at least one spacer element comprises a first spacer element, wherein 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; wherein the effective focal length f1 of the first lens, 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 the following conditions: -3.27≤f1 / EP01≤-1.93; and 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 the following conditions: 1.46≤(CT1+CP1) / SAG12≤2.87.

[0008] According to another aspect of the present invention, an optical lens is provided, comprising a lens barrel, three lenses and at least one spacer element, wherein the three lenses and the at least one spacer element are arranged in the lens barrel, wherein the three lenses comprise a first lens with negative optical power, a second lens with positive optical power and a third lens with optical power, which are arranged in sequence from the object side to the image side; wherein the at least one spacer element comprises a first spacer element, wherein the first spacer element is located between the first lens and the second lens and is in contact with the image side surface portion of the first lens; wherein the inner diameter d0s of the end surface of the lens barrel closest to the object side and the outer diameter D1s of the object side surface of the first spacer element satisfy the following relationship: 0.59≤d0s / D2s≤0.96; and the curvature radius R1 of the object side surface of the first lens, the refractive index N1 of the first lens and the inner diameter d1s of the object side surface of the first spacer element satisfy the following relationship: -1.77≤R4*N2 / (D2S-d2s)≤-0.52.

[0009] Furthermore, the inner diameter d0s of the end surface of the lens barrel closest to the object side, the inner diameter d1s of the object side surface of the first spacing element and the curvature radius R1 of the object side surface of the first lens satisfy: -0.03≤(d0s-d1s) / R1≤1.68.

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

[0011] Furthermore, 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 spacing element satisfy: 1.1≤(R2*N1) / d1m≤2.62.

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

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

[0014] Further, a center thickness CT2 of the second lens on the optical axis of the optical lens and an axial distance SAG22 from an intersection of the 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 center thickness CT1 of the first lens on the optical axis of the optical lens and a center thickness CT2 of the second lens on the optical axis satisfy: 2.19≤CT2 / CT1≤2.86.

[0016] Furthermore, 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 surface of the lens barrel closest to the 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 is located between the second lens and the third lens and is in contact with the image side surface portion of the second lens, wherein,

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

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

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

[0021] Furthermore, the first lens has negative optical power, and the second lens has positive optical power.

[0022] Furthermore, 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.

[0023] By applying the technical solution of the present invention, 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 meet -3.27≤f1 / EP01≤-1.93, it is beneficial to reduce the size of the optical lens without affecting the imaging performance of the optical lens, and meet the requirements 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 face of the lens barrel closest to the object side and the object side face of the first spacer 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 will be prioritized and the thickness of the lens barrel will be sacrificed, resulting in a smaller thickness of the lens barrel. The optical lens formed in this way performs poorly in subsequent reliability experiments in experimental items such as drop, high temperature and humidity, and mechanical shock. It can be understood that when the optical lens meets -3.27≤f1 / EP01≤-1.93, the reliability of the optical lens will deteriorate. In order to meet the requirements of miniaturization and improve the reliability of the optical lens, the optical lens of the present application also meets the following conditions: 0.63≤d1s / R2≤1.59. This arrangement makes the image side surface of the first lens concave, which provides more options for the placement position of the first spacing element while ensuring the imaging performance of the first lens, making the position of the first spacing element more free, and at the same time limiting the inner diameter d1s of the object side surface of the first spacing element, which can ensure the adsorption space between the image side surface of the first lens and the first spacing element, which is conducive to improving the stability of the first lens, and then appropriately reducing the edge thickness of the first lens will not affect the assembly of the optical lens, and at the same time more space can be allocated to the lens barrel, increasing the thickness of the lens barrel, and thus improving the reliability of the optical lens. If d1s / R2 is less than 0.63, the adsorption space between the image side surface of the first lens and the first spacing element becomes smaller, affecting the assembly of the optical lens, and when d1s / R2 is greater than 1.59, the image side surface of the first lens is too curved, affecting the molding of the first lens. By limiting d1s / R2 within the range of 0.63 to 1.59, more space is allocated to the lens barrel while ensuring the bearing stability of the first lens, increasing the thickness of the lens barrel and thereby improving the reliability of the optical lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0025] Figure 1A dimensioning diagram of an optical lens of an optional embodiment of the present invention is shown;

[0026] Figure 2 A schematic structural diagram of an optical lens according to Embodiment 1-1 of the present invention is shown;

[0027] Figure 3 A schematic structural diagram of an optical lens according to Embodiment 1-2 of the present invention is shown;

[0028] Figures 4 to 6 The axial chromatic aberration, astigmatism curve and magnification chromatic aberration curve of the optical lens of the first embodiment of the present invention are respectively shown;

[0029] Figure 7 A schematic structural diagram of an optical lens according to Embodiment 2-1 of the present invention is shown;

[0030] Figure 8 A schematic structural diagram of an optical lens according to Embodiment 2-2 of the present invention is shown;

[0031] Figures 9 to 11 The axial chromatic aberration, astigmatism curve and magnification chromatic aberration curve of the optical lens of the second embodiment of the present invention are respectively shown;

[0032] Fig.12 A schematic structural diagram of an optical lens according to Embodiment 3-1 of the present invention is shown;

[0033] Fig.13 A schematic structural diagram of an optical lens according to Embodiment 3-2 of the present invention is shown;

[0034] Figures 14 to 16 The axial chromatic aberration, astigmatism curve and magnification chromatic aberration curve of the optical lens of the third embodiment of the present invention are respectively shown;

[0035] Fig.17 A schematic structural diagram of an optical lens according to Embodiment 4-1 of the present invention is shown;

[0036] Fig.18 A schematic structural diagram of an optical lens according to Embodiment 4-2 of the present invention is shown;

[0037] Figures 19 to 21 The axial chromatic aberration, astigmatism curve and magnification chromatic aberration curve of the optical lens of the fourth embodiment of the present invention are respectively shown;

[0038] Fig. 22 A table showing changes in the field area of ​​the optical lens in an optional embodiment of the present invention after a mechanical impact;

[0039] Fig.23 A table showing changes in the field area of ​​an optical lens in an example of the present invention after a mechanical impact;

[0040] Fig.24 A table showing changes in the field area of ​​an optical lens in another example of the present invention after a mechanical impact.

[0041] The above drawings include the following reference numerals:

[0042] 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

[0043] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0044] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0045] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0046] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0047] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0048] In this article, the paraxial area refers to the area 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 area; 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 area. The judgment of the surface shape in the paraxial area can be based on the judgment method of the general knowledge in this field, and the positive and negative R value (R refers to the radius of curvature of the paraxial area, usually refers to the R value on the lens database (lens data) in the optical software) is used to judge the convexity and concavity. For the object side, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; for the image side, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface. In the present application, the left side is the object side and the right side is the image side.

[0049] In order to solve the problem that the optical lens in the prior art has poor reliability due to the requirement of miniaturization, the present invention provides an optical lens.

[0050] like Figures 1 to 24 As shown, the optical lens includes a lens barrel, three lenses and at least one spacer element, the three lenses and the at least one spacer element are arranged in the lens barrel, the three lenses include a first lens, a second lens and a third lens arranged in sequence from the object side to the image side; the at least one spacer element includes a first spacer element, 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, 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 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.

[0051] 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 meet -3.27≤f1 / EP01≤-1.93, it is beneficial to reduce the size of the optical lens without affecting the imaging performance of the optical lens, and meet the requirements 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 face of the lens barrel closest to the object side and the object side face of the first spacer 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 will be prioritized and the thickness of the lens barrel will be sacrificed, resulting in a smaller thickness of the lens barrel. The optical lens formed in this way performs poorly in subsequent reliability experiments in experimental items such as drop, high temperature and humidity, and mechanical shock. It can be understood that when the optical lens meets -3.27≤f1 / EP01≤-1.93, the reliability of the optical lens will deteriorate.

[0052] In order to meet the requirements of miniaturization and improve the reliability of the optical lens, the optical lens of the present application also meets the following conditions: 0.63≤d1s / R2≤1.59. This arrangement makes the image side surface of the first lens concave, which provides more options for the placement position of the first spacing element while ensuring the imaging performance of the first lens, making the position of the first spacing element more free, and at the same time limiting the inner diameter d1s of the object side surface of the first spacing element, which can ensure the adsorption space between the image side surface of the first lens and the first spacing element, which is conducive to improving the stability of the first lens, and then appropriately reducing the edge thickness of the first lens will not affect the assembly of the optical lens, and at the same time more space can be allocated to the lens barrel, increasing the thickness of the lens barrel, and thus improving the reliability of the optical lens. If d1s / R2 is less than 0.63, the adsorption space between the image side surface of the first lens and the first spacing element becomes smaller, affecting the assembly of the optical lens, and when d1s / R2 is greater than 1.59, the image side surface of the first lens is too curved, affecting the molding of the first lens. By limiting d1s / R2 within the range of 0.63 to 1.59, more space is allocated to the lens barrel while ensuring the bearing stability of the first lens, increasing the thickness of the lens barrel and thereby improving the reliability of the optical lens.

[0053] In addition, refer to Table 1 and Figure 22 to Figure 24 As shown, Fig. 22 23 shows a table showing the field changes of the optical lens after mechanical impact when f1 / EP01=-2.55, d1s / R2=1.09; 24 shows a table showing the field changes of the optical lens after mechanical impact when f1 / EP01=-2.55, d1s / R2=1.7.

[0054] Depend on Figure 22 to Figure 24It can be seen that when d1s / R2=1.09 is satisfied, the field curvature obtained after the mechanical shock changes little, indicating that the mechanical shock has little effect on the optical lens, and the reliability of the optical lens is better. When d1s / R2=0.5 is satisfied, the field curvature obtained after the mechanical shock changes greatly, indicating that the mechanical shock has a greater impact on the optical lens, and the reliability of the optical lens is poor. When d1s / R2=1.7 is satisfied, the field curvature obtained after the mechanical shock changes greatly, indicating that the mechanical shock has a greater impact on the optical lens, and the reliability of the optical lens is poor. It can be seen that 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, the present application reasonably constrains the relationship between the radius of curvature of the image side surface of the first lens and the outer diameter of the first spacing element by constraining 0.63≤d1s / R2≤1.59, which can ensure the adsorption space between the image side surface of the first lens and the first spacing element, improve the bearing stability of the first lens, and appropriately reduce the edge thickness of the first lens to allocate more space to the lens barrel, increase the thickness of the lens barrel, and thereby improve the reliability of the optical lens.

[0055]

[0056] Table 1

[0057] It should be noted that the present application limits d1s / R2 within the above range, optimizes the surface shape of the image side surface 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, so as to improve the bearing stability of the first lens, and provides more options for the placement position of the first spacing element while ensuring the imaging performance of the first lens, so as to increase the freedom of designing the barrel wall thickness at the front end of the lens barrel, thereby achieving the purpose of improving the reliability of the optical lens. Improving the reliability does not depend on the focal length of the lens and the surface shape of other lenses, and the focal length and surface shape of other lenses are further optimization of the optical lens on this basis. Other lenses can be positive or negative according to the actual design requirements of the optical system, and the surface shape of other lenses can also 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, it is possible to meet the miniaturization requirements while ensuring the reliability of the optical lens.

[0058] For example, the first lens has negative optical power and the second lens has positive optical 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; and the image side surface of the third lens is concave. The optical lens can be simulated by software and / or tools such as ZEMAX and CODEV. Preferably, the optical lens is simulated by CODEV. In the process of simulation using software and / or tools such as the above, the surface shape of each lens can be simulated and appropriately adjusted according to the surface shape of the software and / or tools used.

[0059] In some optional embodiments, 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 face of the first spacer element, and the curvature radius R1 of the object side face of the first lens satisfy: -0.03≤(d0s-d1s) / R1≤1.68. By limiting (d0s-d1s) / R1 to the above range, while ensuring that the optical lens meets the requirements of miniaturization and improving reliability, the matching degree between the first lens and the lens barrel is improved, which is conducive to controlling the incident angle of light, so that the optical lens in this embodiment also has the characteristics of a large field of view. The optical lens in this embodiment can be applied to VR and AR devices that require the optical lens to have a miniaturized and large field of view, so as to provide a wide and clear field of view for VR and AR, thereby improving the user's immersive experience.

[0060] In addition, (d0s-d1s) / R1 is limited within the above range, so that the inner diameter d0s of the end face of the lens barrel closest to the object side and the curvature radius R1 of the object side face of the first lens are mutually restricted, so as to ensure the gap between the object side face of the first lens and the barrel wall of the lens barrel, so as to ensure the stability of the first lens assembly, so as to improve the stability of the optical lens in the reliability test, and further improve the reliability of the optical lens.

[0061] In some optional embodiments, the aperture is located between the first lens and the second lens. By limiting (d0s-d1s) / R1 within the above range, it helps to ensure that the optical lens optimizes the aperture size of the aperture while maintaining a sufficient field of view and imaging area, thereby increasing the luminous flux of the optical lens and further improving the relative illumination of the optical lens. High relative illumination means that the optical lens can capture more light under the same light, which is particularly important for imaging in low-light environments. It can significantly improve the imaging performance under low-light conditions and increase the brightness and details of the image.

[0062] In some optional embodiments, 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. This design ensures the assembly order of the lenses, that is, the lenses are inserted into the lens barrel from the object side to the image side, which helps to simplify the assembly process and reduce the degradation of optical performance caused by improper assembly order. The smaller object side outer diameter also means that the front end of the lens barrel has a certain closing design, so that the head of the optical lens is smaller, which is convenient for adaptation to electronic equipment, while ensuring the difference in outer diameters at both ends of the lens barrel, which is conducive to ensuring the feasibility of molding the lens barrel.

[0063] In some optional embodiments, 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 spacing element satisfy: 1.1≤(R2*N1) / d1m≤2.62. By limiting (R2*N1) / d1m within the above range, it is ensured that after the light is emitted through the image side surface of the first lens, the imaging light can smoothly pass through the first spacing element, and it is also beneficial for the light to converge at the aperture position, thereby improving the imaging clarity and focusing performance. At the same time, by controlling the relationship between the curvature radius and the refractive index of the image side surface of the first lens and the size of the first spacing element, the path of the light between the first lens and the first spacing element can be optimized, internal reflections can be reduced, thereby reducing the generation of stray light and ensuring the imaging quality of the optical lens.

[0064] 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 surface of the lens barrel closest to the object side and the object side surface of the first spacing element satisfy: 1.82≤EP01 / CT1≤3.25. By limiting EP01 / CT1 within the above range, the reflection of light between the edge of the first lens and the inner wall of the lens barrel is reduced while ensuring the molding of the first lens, thereby avoiding the formation of additional light spots and reducing stray light.

[0065] 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 light at the first lens, and is beneficial to control the ratio of the center thickness to the edge thickness of the first lens, while ensuring the molding of the first lens while reducing the edge thickness, so as to increase the wall thickness of the lens barrel, and further increase the reliability of the optical lens.

[0066] In some optional embodiments, the center thickness CT1 of the first lens on the optical axis of the optical lens, the maximum thickness CP1 of the first spacing element, and the on-axis distance SAG12 between the intersection of the image side surface of the first lens and the optical axis to the effective radius vertex of the image side surface of the first lens satisfy: 1.46≤(CT1+CP1) / SAG12≤2.87. (CT1+CP1) / SAG12 is limited within the above range to ensure the processability of the first lens, avoid the mismatch between the center thickness of the first lens and the sagittal height of the image side surface of the first lens, and cause the first lens to produce flow marks and other molding problems during the molding process. At the same time, the center thickness of the first lens and the thickness of the first spacing element are limited, while ensuring the processability of the first lens, the bearing strength of the first spacing element on the first lens is guaranteed, thereby improving the reliability of the optical lens. In addition, limiting (CT1+CP1) / SAG12 within the above range is conducive to controlling the deflection angle of light in the first lens and when it is emitted by the first lens, and is conducive to reducing stray light formed by reflection of the first spacing element, thereby improving the imaging quality of the optical lens.

[0067] In some optional 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 vertex of the effective radius 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 also beneficial to controlling the degree of light deflection in the second lens and reducing the generation of stray light.

[0068] In some optional 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, while ensuring the molding of the first lens and the second lens, it is helpful to control the gap between the two within a reasonable range, which helps to reduce the change of optical performance caused by thermal expansion and contraction, and enhance the stability and reliability of the optical lens under different temperature conditions.

[0069] In some optional embodiments, the radius of curvature 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 surface of the lens barrel closest to the image side satisfy: 0.26≤d0m / (R6*N3)≤2.24. By limiting d0m / (R6*N3) within the above range, the inner diameter of the end surface of the lens barrel closest to the image side and the size of the third lens can be controlled at the same time, which is conducive to the miniaturization of the optical lens, and the deflection ability of the image side surface of the third lens to the light is controlled to ensure that the light smoothly transitions within the inner ring range between the third lens and the end surface of the lens barrel closest to the image side, avoiding excessive deflection of the light, which is conducive to improving the clarity and contrast of the imaging. In addition, by limiting d0m / (R6*N3), after the light is emitted from the image side surface of the third lens, it can enter the inner diameter range of the end surface of the lens barrel closest to the image side, optimizing the light path, helping to reduce the reflection of light between the third lens and the lens barrel, reducing the generation of optical ghost images, especially reducing the energy threshold of ghost images, which is conducive to improving the imaging quality of the optical lens.

[0070] In some optional embodiments, at least one spacer element includes a second spacer element, the second spacer element is located between the second lens and the third lens and is in contact with the image side surface of the second lens, wherein the outer diameter D2s of the object side surface of the second spacer element, the radius of curvature R4 of the image side surface of the second lens and the refractive index N2 of the second lens satisfy: -3.06≤D2s / (R4*N2)≤-1.83. Limiting D2s / (R4*N2) within the above range can effectively control the curvature 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 at the same time ensure that the image side surface of the second lens and the second spacer element have sufficient supporting width to support the second lens and prevent the lens from shifting during the assembly process, thereby maintaining the overall assembly stability of the optical lens.

[0071] In some optional embodiments, the effective focal length f2 of the second lens and the interval EP12 between the first spacing element and the second spacing element satisfy: 1.41≤f2 / EP12≤2.89. Limiting f2 / EP12 within the above range ensures the light deflection 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 remains stable under various conditions of use, thereby extending the service life of the lens. In addition, limiting f2 / EP12 within the above range is also conducive to the molding of the second lens.

[0072] In some optional embodiments, the maximum thickness CP2 of the second spacing element, the spacing EP12 between the first spacing element and the second spacing element, and the center 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 center 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 when the second lens is formed, ensures the yield of the second lens, and at the same time ensures that the second lens and the second spacing element remain structurally stable and are not prone to displacement or deformation when subjected to mechanical shock or environmental changes, such as high temperature, low temperature, and falling, thereby improving the reliability of the optical lens. In addition, the parameter formula optimizes the space occupied by the second lens in the lens barrel, which is conducive to forming a compact optical system and miniaturization of the optical lens.

[0073] According to another aspect of the present invention, an optical lens is also provided, comprising a lens barrel, three lenses and at least one spacer element, wherein the three lenses and the at least one spacer element are arranged in the lens barrel, wherein the three lenses comprise a first lens with negative optical power, a second lens with positive optical power and a third lens with optical power, which are arranged in sequence from the object side to the image side; wherein the at least one spacer element comprises a first spacer element, wherein 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; wherein the effective focal length f1 of the first lens, 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 the following conditions: -3.27≤f1 / EP01≤-1.93; and 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 the following conditions: 1.46≤(CT1+CP1) / SAG12≤2.87.

[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 meet -3.27≤f1 / EP01≤-1.93, it is beneficial to reduce the size of the optical lens without affecting the imaging performance of the optical lens, and meet the requirements 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 face of the lens barrel closest to the object side and the object side face of the first spacer 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 will be prioritized and the thickness of the lens barrel will be sacrificed, resulting in a smaller thickness of the lens barrel. The optical lens formed in this way performs poorly in subsequent reliability experiments in experimental items such as drop, high temperature and humidity, and mechanical shock. It can be understood that when the optical lens meets -3.27≤f1 / EP01≤-1.93, the reliability of the optical lens will deteriorate. In order to meet the requirements of miniaturization and improve the reliability of the optical lens, the optical lens of the present application also meets the following conditions: 1.46≤(CT1+CP1) / SAG12≤2.87, and (CT1+CP1) / SAG12 is limited within the above range to ensure the machinability of the first lens, and avoid the mismatch between the center thickness of the first lens and the sagittal height of the image side of the first lens, which may cause molding problems such as flow marks during the molding 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, so that the first spacing element can ensure the bearing strength of the first lens while ensuring the machinability of the first lens, thereby improving the reliability of the optical lens.

[0075] In addition, limiting (CT1+CP1) / SAG12 within the above range is beneficial to controlling the deflection angle of light in the first lens and when emitted by the first lens, which is beneficial to reducing stray light formed by reflection of the first spacing element, thereby improving the imaging quality of the optical lens.

[0076] According to another aspect of the present invention, an optical lens is provided, comprising a lens barrel, three lenses and at least one spacer element, wherein the three lenses and the at least one spacer element are arranged in the lens barrel, wherein the three lenses comprise a first lens with negative optical power, a second lens with positive optical power and a third lens with optical power, which are arranged in sequence from the object side to the image side; wherein the at least one spacer element comprises a first spacer element, wherein the first spacer element is located between the first lens and the second lens and is in contact with the image side surface portion of the first lens; wherein the inner diameter d0s of the end surface of the lens barrel closest to the object side and the outer diameter D1s of the object side surface of the first spacer element satisfy the following relationship: 0.59≤d0s / D2s≤0.96; and the curvature radius R1 of the object side surface of the first lens, the refractive index N1 of the first lens and the inner diameter d1s of the object side surface of the first spacer element satisfy the following relationship: -1.77≤R4*N2 / (D2S-d2s)≤-0.52.

[0077] 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 meet 0.59≤d0s / D2s≤0.96, the inner diameter d0s of the end face of the lens barrel closest to the object side is similar to the outer diameter D2s of the object side face of the second spacer element, thereby making the size of the front end and the rear end of the lens barrel similar, which is conducive to the miniaturization of the optical lens. However, when the light propagates between the lenses, the light is easily deflected to the inner wall of the lens barrel or the optical structure area of ​​the lens to produce reflection, resulting in serious stray light. In order to reduce the generation of stray light in the optical lens, the present application constrains R4*N2 / (D2S-d2s) within a reasonable range to adjust the degree of deflection when the light is emitted by the second lens, optimize the emission angle of the light on the image side of the second lens, ensure that the light will not produce a large angle deflection, reduce the generation of stray light, and ensure that the second spacer element can effectively block the area where stray light may be generated, while not limiting the normal transmission path of the light.

[0078] Of course, this embodiment may also include other parameter formulas in the above embodiment, which will not be described one by one here.

[0079] Optionally, the optical lens may further include a protective glass for protecting a photosensitive element located on the imaging surface.

[0080] The optical lens in the present application may use multiple lenses, such as the three lenses mentioned above. In the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The characteristics of an aspherical lens are: the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After using an aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality.

[0081] In some optional embodiments, the above-mentioned multiple lenses may have at least one trimmed lens, the outer peripheral surface of the trimmed lens may have a trimmed portion and a non-trimmed portion, and the outer diameter of the trimmed portion of the lens is smaller than the outer diameter of the non-trimmed portion of the lens. When the outer peripheral surface of the lens has a trimmed portion, the outer diameter of the lens generally refers to the outer diameter of the non-trimmed portion of the lens.

[0082] In some optional embodiments, at least one trimming spacer element may be included in the plurality of spacer elements. The outer circumference of the trimming spacer element may have a trimming portion and a non-trimming portion, and the outer diameter of the trimming portion of the trimming spacer element is smaller than the outer diameter of the non-trimming portion of the trimming spacer element, and the outer diameter of the spacer element generally refers to the maximum outer diameter of the non-trimmed portion.

[0083] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the optical lens can be changed to obtain the various results and advantages described in this 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 may also include other numbers of lenses.

[0084] Figure 1 A schematic diagram of the dimension marking of an optical lens of the present application is shown. Figure 1 Parameters such as d1s, d1m, D2s, D2m, d0s, d0m, CP1, CP2, EP01, and EP12 are marked in the figure 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, these parameters will no longer be reflected in the drawings when the specific embodiments are described later.

[0085] The following further describes examples of specific surface shapes and parameters of the optical lens applicable to the above-mentioned embodiments with reference to the accompanying drawings.

[0086] It should be noted that in the following embodiment 1, there are two examples of embodiment 1-1 and embodiment 1-2, in embodiment 2, there are two examples of embodiment 2-1 and embodiment 2-2, in embodiment 3, there are two examples of embodiment 3-1 and embodiment 3-2, and in embodiment 4, there are two examples of embodiment 4-1 and embodiment 4-2. In the two examples of the same embodiment, the parameters such as the radius of curvature, center thickness, and the spacing distance between the lenses and the coefficient of high-order terms of the optical lens are the same, but the parameters such as the thickness, inner diameter, and outer diameter of the lens barrel, the first spacing element, and the second spacing element, as well as the shapes of some lenses are different. In other words, the main structure for imaging is the same, but the auxiliary structure for imaging is different.

[0087] It should be noted that any one of the following embodiments 1 to 4 is applicable to all embodiments of the present application.

[0088] Embodiment 1

[0089] like Figures 2 to 6 As shown, the optical lens of embodiment 1 is described. Figure 2 The structure diagram of the optical lens of Example 1-1 is shown. Figure 3 A schematic structural diagram of the optical lens of Example 1-2 is shown.

[0090] like Figure 2 and Figure 3 As 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 second auxiliary spacer element P2b and a third lens E3 arranged in sequence from the object side to the image side.

[0091] like Figure 2 Shown is the structural representation of the optical lens of embodiment 1-1.In this example, the object side end of lens barrel has a bearing convex edge extending toward the central axis of lens barrel, and the object side surface S1 of the first lens abuts against the bearing convex edge of lens barrel P0.The object side surface and the image side surface of the first spacing 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 spacing element P2 abut against the image side surface S4 of the second lens respectively and the object side surface of the second auxiliary spacing element P2b abut against, and the image side surface of the second auxiliary spacing element P2b abuts against the object side surface S5 of the 3rd lens.

[0092] like Figure 3 FIG. 1 is a schematic diagram of the structure of the optical lens of Example 1-2. In this example, the supporting and abutting manner of each spacing element is the same as that of Example 1-1, and the relevant description in Example 1-1 may be referred to, and will not be repeated here.

[0093] In summary, the structural parameters of the optical lens of Example 1 in Example 1-1 and Example 1-2 are shown in Table 2. (Unit: mm)

[0094]

[0095]

[0096] Table 2

[0097] In the first embodiment, 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 convex 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. S7 to S10 in the following table 3 can be the surface of the filter or the protective glass, while S11 is the imaging surface, and STO is the aperture, which is not shown in the figure.

[0098] 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 surface of the first lens and the optical axis to the effective radius vertex of the image side surface of the first lens is 0.09 mm, and the on-axis distance SAG22 between the intersection of the image side surface of the second lens and the optical axis to the effective radius vertex of the image side surface of the second lens is -0.21 mm.

[0099] Table 3 shows a basic structural parameter table of the optical lens of Example 1, wherein the units of the radius of curvature and thickness / distance are all millimeters.

[0100]

[0101] Table 3

[0102] In the first embodiment, the object side surface and the image side surface of the first lens E1 to the third lens E3 are all aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0103]

[0104] Among them, x is the distance vector height from the vertex of the aspherical surface when the aspherical surface is at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c=1 / R, that is, the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above; k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspherical surface. The following Table 4 gives the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical mirror surface S1-S6 in Example 1.

[0105] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -2.05E+00 -2.47E+00 4.92E+01 -1.48E+02 2.21E-04 1.11E-05 8.82E-06 -1.01E-05 5.58E-06 S2 3.40E+00 2.94E+01 -1.61E+02 1.81E+04 8.88E-07 3.49E-06 4.22E-06 3.72E-06 5.01E-06 S3 -9.61E-01 -3.28E+00 -2.34E+01 4.12E+02 8.91E-05 -9.68E-05 1.33E-04 3.84E-05 3.82E-05 S4 -8.31E-01 -9.77E+00 1.54E+01 -5.61E+01 1.93E+01 5.00E-05 6.68E-05 2.06E-04 4.96E-05 S5 -2.58E-01 -7.48E+00 2.72E+01 -1.17E+02 -3.01E+01 8.60E+01 4.95E-06 1.68E-05 5.45E-06 S6 -1.93E-01 1.16E+00 -1.03E+00 -1.81E+01 4.85E+01 1.81E-06 3.35E-06 -8.52E-06 4.51E-06

[0106] Table 4

[0107] Figure 4 The axial chromatic aberration curve of the optical lens of the first embodiment is shown, which indicates the deviation of the focusing point of light rays of different wavelengths after passing through the optical lens. Figure 5 The astigmatism curve of the optical lens of Example 1 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 6 The magnification chromatic aberration curve of the optical lens of Example 1 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens.

[0108] according to Figures 4 to 6 It can be seen that the optical lens provided in the first embodiment can achieve good imaging quality.

[0109] Embodiment 2

[0110] like Figures 7 to 11 As shown, the optical lens of the second embodiment is described. Figure 7 The structure diagram of the optical lens of Example 2-1 is shown. Figure 8 A schematic structural diagram of the optical lens of Example 2-2 is shown.

[0111] like Figure 7 As 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 and a third lens E3 arranged in sequence from the object side to the image side.

[0112] exist Figure 8 The optical lens shown in Figure 7 The optical lenses shown in FIG. 1 have the same number of lenses but different numbers of spacer elements. Figure 8 The optical lens shown also includes a second auxiliary spacing element P2b, wherein the second auxiliary spacing element P2b is located between the second spacing element P2 and the third lens E3.

[0113] like Figure 7 2-1. The object side of the lens barrel has a supporting convex edge extending toward the central axis of the lens barrel, and the object side surface S1 of the first lens abuts against the supporting convex edge of the lens barrel P0. The object side surface and the image side surface of the first spacing 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 spacing element P2 abut against the image side surface S4 of the second lens and the object side surface S5 of the third lens respectively.

[0114] like Figure 8, which is a schematic diagram of the structure of the optical lens of Example 2-2. In this example, the supporting and abutting manner of each spacing element is similar to that of Example 2-1, and reference may be made to the relevant description in Example 2-1, which will not be repeated here. The difference is the supporting and abutting manner of the second spacing element P2 and the third lens E3. Figure 8 In the optical lens shown, the image side surface of the second spacer element P2 partially abuts against 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 against the object side surface S5 of the third lens.

[0115] In summary, the structural parameters of the optical lens of Example 2 in Example 2-1 and Example 2-2 are shown in Table 5. (Unit: mm)

[0116] Parameters / Examples 2-1 2-2 d1s 0.402 0.431 d1m 0.402 0.391 d2s 0.762 0.964 D2s 1.763 1.525 d0s 1.178 1.466 d0m 1.920 1.904 CP1 0.022 0.022 CP2 0.022 0.200 EP01 0.395 0.506 EP12 0.449 0.249

[0117] Table 5

[0118] In the second embodiment, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The object side surface S3 of the second lens is concave, and the image side surface S4 of the second lens is convex. The object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is concave.

[0119] In Example 2, 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 on-axis distance SAG12 between the intersection of the image side surface of the first lens and the optical axis to the effective radius vertex of the image side surface of the first lens is 0.09 mm, and the on-axis distance SAG22 between the intersection of the image side surface of the second lens and the optical axis to the effective radius vertex of the image side surface of the second lens is -0.19 mm.

[0120] Table 6 shows a basic structural parameter table of the optical lens of Example 2, wherein the units of the radius of curvature and thickness / distance are all millimeters.

[0121]

[0122] Table 6

[0123] Table 7 below lists the high-order coefficients A4, A6, A8, A10, A12, A14, and A16 that can be used for the aspheric mirror surfaces S1-S6 in Example 2. The surface shape of each aspheric surface can be defined by the formula (1) given in the above-mentioned Example 1.

[0124] Face number A4 A6 A8 A10 A12 A14 A16 S1 4.60E-01 -7.94E-01 -5.48E-01 2.56E+00 1.93E-12 1.03E-13 2.72E-15 S2 -6.01E-01 7.64E+01 -2.09E+03 2.61E+04 -2.87E-17 0.00E+00 0.00E+00 S3 -1.64E+00 9.89E+00 -2.83E+02 2.92E+03 5.26E-14 1.41E-20 0.00E+00 S4 -8.02E-01 -4.77E+00 5.38E+00 -7.92E+01 4.52E-13 6.78E-14 7.86E-16 S5 -1.87E-01 1.28E+00 -1.26E+00 3.62E+00 -8.13E-14 1.46E-15 2.24E-16 S6 -6.84E-01 2.80E+00 -5.10E+00 8.92E+00 4.96E-14 -5.74E-15 -8.62E-18

[0125] Table 7

[0126] Fig. 9The axial chromatic aberration curve of the optical lens of the second embodiment is shown, which indicates the deviation of the focusing point of light rays of different wavelengths after passing through the optical lens. Fig.10 The astigmatism curve of the optical lens of Example 2 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.11 The magnification chromatic aberration curve of the optical lens of Example 2 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens.

[0127] according to Figures 9 to 11 It can be seen that the optical lens provided in the second embodiment can achieve good imaging quality.

[0128] Embodiment 3

[0129] like Figures 12 to 16 As shown, the optical lens of embodiment 3 is described. Fig.12 The structure diagram of the optical lens of Example 3-1 is shown. Fig.13 A schematic structural diagram of the optical lens of Example 3-2 is shown.

[0130] like Fig.12 As 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 second auxiliary spacer element P2b and a third lens E3 arranged in sequence from the object side to the image side.

[0131] exist Fig.13 The optical lens shown in Fig.12 The optical lenses shown in FIG. 1 have the same number of lenses but different numbers of spacer elements. Fig.13 The optical lens shown does not have the second auxiliary spacing element P2b, wherein the second spacing element P2 is in contact with the third lens E3.

[0132] like Fig.12 Shown is the structural representation of the optical lens of embodiment 3-1. In this example, the object side end of the lens barrel has a bearing convex edge extending toward the central axis of the lens barrel, and the object side surface S1 of the first lens abuts against the bearing convex edge of the lens barrel P0. The object side surface and the image side surface of the first spacing 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 spacing element P2 abut against the image side surface S4 of the second lens respectively and the object side surface of the second auxiliary spacing element P2b abut against the object side surface S5 of the third lens.

[0133] like Fig.13, which is a schematic diagram of the structure of the optical lens of Example 3-2. In this example, the abutment manner of each spacing element is similar to that of Example 3-1, and reference may be made to the relevant description in Example 3-1, which will not be repeated here. The difference is that in this embodiment, there is no second auxiliary spacing element P2b, and the object side surface of the second spacing element P2 partially abuts against the object side surface S5 of the third lens.

[0134] In summary, the structural parameters of the optical lens of Example 3 in Example 3-1 and Example 3-2 are shown in Table 8. (Unit: mm)

[0135] Parameters / Examples 3-1 3-2 d1s 0.402 0.434 d1m 0.402 0.394 d2s 0.820 0.768 D2s 1.341 1.957 d0s 1.231 1.463 d0m 1.687 2.174 CP1 0.022 0.022 CP2 0.249 0.022 EP01 0.439 0.498 EP12 0.281 0.418

[0136] Table 8

[0137] In the third embodiment, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is convex. The object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is concave.

[0138] In Example 3, 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 surface of the first lens and the optical axis to the effective radius vertex of the image side surface of the first lens is 0.12 mm, and the on-axis distance SAG22 between the intersection of the image side surface of the second lens and the optical axis to the effective radius vertex of the image side surface of the second lens is -0.20 mm.

[0139] Table 9 shows a basic structural parameter table of the optical lens of Example 3, wherein the units of the radius of curvature and thickness / distance are all millimeters.

[0140]

[0141] Table 9

[0142] Table 10 below lists the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical mirror surface S1-S6 in Example 3. Among them, the surface shape of each aspherical surface can be defined by the formula (1) given in the above-mentioned Example 1.

[0143] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -1.79E+00 -1.03E+00 -8.76E+00 3.75E+01 2.21E-04 1.11E-05 8.83E-06 -1.01E-05 5.59E-06 S2 3.57E+00 1.26E+01 3.74E+02 2.97E+02 8.96E-07 3.50E-06 4.23E-06 3.73E-06 5.01E-06 S3 -6.02E-01 -1.38E+01 4.58E+01 -5.35E+02 8.91E-05 -9.68E-05 1.33E-04 3.84E-05 3.82E-05 S4 -7.64E-01 -1.28E+01 9.89E+01 -3.60E+02 1.93E+01 5.00E-05 6.68E-05 2.06E-04 4.96E-05 S5 -1.32E+00 -1.64E+01 7.05E+01 -3.10E+02 -3.01E+01 8.60E+01 4.96E-06 1.69E-05 5.46E-06 S6 -2.54E-01 -9.23E+00 3.24E+01 -4.66E+01 4.85E+01 1.81E-06 3.36E-06 -8.51E-06 4.52E-06

[0144] Table 10

[0145] Fig.14 The axial chromatic aberration curve of the optical lens of the third embodiment is shown, which indicates the deviation of the focusing point of light rays of different wavelengths after passing through the optical lens. Fig.15The astigmatism curve of the optical lens of Example 3 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.16 The magnification chromatic aberration curve of the optical lens of Example 3 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens.

[0146] according to Figures 14 to 16 It can be seen that the optical lens provided in the third embodiment can achieve good imaging quality.

[0147] Embodiment 4

[0148] like Figures 17 to 21 As shown, the optical lens of embodiment 4 is described. Fig.17 FIG4 is a schematic diagram showing the structure of the optical lens of Example 4-1. Fig.18 A schematic structural diagram of the optical lens of Example 4-2 is shown.

[0149] like Fig.17 As 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 second auxiliary spacer element P2b and a third lens E3 arranged in sequence from the object side to the image side.

[0150] exist Fig.18 The optical lens shown in Fig.12 The optical lenses shown in FIG. 1 have the same number of lenses but different numbers of spacer elements. Fig.13 The optical lens shown does not have the second auxiliary spacing element P2b, wherein the second spacing element P2 is in contact with the third lens E3.

[0151] like Fig.17 Shown is the structural representation of the optical lens of embodiment 4-1. In this example, the object side end of the lens barrel has a bearing convex edge extending toward the central axis of the lens barrel, and the object side surface S1 of the first lens abuts against the bearing convex edge of the lens barrel P0. The object side surface and the image side surface of the first spacing 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 spacing element P2 abut against the image side surface S4 of the second lens respectively and the object side surface of the second auxiliary spacing element P2b abut against the object side surface S5 of the third lens.

[0152] like Fig.18, which is a schematic diagram of the structure of the optical lens of Example 4-2. In this example, the abutment manner of each spacing element is similar to that of Example 4-1, and reference may be made to the relevant description in Example 4-1, which will not be repeated here. The difference is that in this embodiment, there is no second auxiliary spacing element P2b, and the object side surface of the second spacing element P2 partially abuts against the object side surface S5 of the third lens.

[0153] In summary, the structural parameters of the optical lens of Example 4 in Example 4-1 and Example 4-2 are shown in Table 11. (Unit: mm)

[0154]

[0155]

[0156] Table 11

[0157] In the fourth embodiment, the object side surface S1 of the first lens is a concave surface, and the image side surface S2 of the first lens is a concave surface. The object side surface S3 of the second lens is a convex surface, and the image side surface S4 of the second lens is a 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.

[0158] 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 on-axis distance SAG12 between the intersection of the image side surface of the first lens and the optical axis to the effective radius vertex of the image side surface of the first lens is 0.06 mm, and the on-axis distance SAG22 between the intersection of the image side surface of the second lens and the optical axis to the effective radius vertex of the image side surface of the second lens is -0.20 mm.

[0159] Table 12 shows a basic structural parameter table of the optical lens of Example 4, wherein the units of the radius of curvature and thickness / distance are all millimeters.

[0160]

[0161] Table 12

[0162] Table 13 below gives the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical mirror surface S1-S6 in Example 4. Among them, the surface shape of each aspherical surface can be defined by the formula (1) given in the above-mentioned Example 1.

[0163]

[0164]

[0165] Table 13

[0166] Fig.19 The axial chromatic aberration curve of the optical lens of Example 4 is shown, which indicates the deviation of the focusing point of light rays of different wavelengths after passing through the optical lens. Fig. 20 The astigmatism curve of the optical lens of Example 4 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.21 The magnification chromatic aberration curve of the optical lens of Example 4 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens.

[0167] according to Figures 19 to 21 It can be seen that the optical lens provided in the fourth embodiment can achieve good imaging quality.

[0168] In summary, the optical lenses of Examples 1 to 4 respectively satisfy the relationships shown in Table 14.

[0169] Conditional / Example 1-1 1-2 2-1 2-2 3-1 3-2 4-1 4-2 f1 / EP01 -2.08 -2.77 -3.27 -2.55 -2.19 -1.93 -2.86 -2.28 (d0s-d1s) / R1 1.41 0.91 0.69 0.91 1.36 1.68 -0.03 -0.03 d1s / R2 1.42 1.55 1.02 1.09 1.48 1.59 0.63 0.68 (R2*N1) / d1m 1.14 1.15 1.51 1.55 1.10 1.12 2.58 2.62 D2s / (R4*N2) -2.11 -2.17 -2.51 -2.17 -1.83 -2.68 -1.94 -3.06 EP01 / CT1 2.82 2.12 1.82 2.33 2.87 3.25 2.45 3.07 (CT1+CP1) / SAG12 1.94 1.94 2.66 2.66 1.46 1.46 2.87 2.87 CT2 / |SAG22| 2.07 2.07 2.50 2.50 2.19 2.19 1.95 1.95 CT2 / CT1 2.84 2.84 2.19 2.19 2.86 2.86 2.60 2.60 f2 / EP12 2.39 1.92 1.60 2.89 2.10 1.41 2.15 1.59 (CT2+CP2) / EP12 3.01 2.30 1.11 2.71 2.44 1.10 2.44 1.13 d0m / (R6*N3) 1.05 1.03 0.26 0.26 1.59 2.05 1.58 2.24 d0s / D2s 0.93 0.71 0.67 0.96 0.92 0.75 0.81 0.59 R4*N2 / (D2S-d2s) -1.44 -1.15 -0.70 -1.25 -1.40 -0.61 -1.77 -0.52

[0170] Table 14

[0171] Table 15 shows the effective focal length of each lens of the optical lens of Examples 1 to 4 (unit: mm).

[0172] Parameters / Examples one two three Four f1(mm) -0.90 -1.29 -0.96 -1.05 f2(mm) 0.56 0.72 0.59 0.58 f3(mm) -6.07 11.09 -6.09 -3.33 SAG12(mm) 0.09 0.09 0.12 0.06 SAG22(mm) -0.21 -0.19 -0.20 -0.20

[0173] Table 15

[0174] The present application also provides an imaging device, whose electronic photosensitive element can be a photosensitive coupled device (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated in a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical lens described above.

[0175] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0176] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0177] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0178] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An optical lens, characterized in that: The invention comprises a lens barrel, three lenses and at least one spacer element, wherein the three lenses and the at least one spacer element are arranged in the lens barrel, The three lenses include a first lens, a second lens and a third lens arranged in sequence from the object side to the image side; The at least one spacer element includes a first spacer element located between the first lens and the second lens and in contact with an image-side surface portion 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 spacing element satisfy: -3.27≤f1 / EP01≤-1.93; An inner diameter d1s of the object-side surface of the first spacer element and a curvature radius R2 of the image-side surface of the first lens satisfy the following relationship: 0.63≤d1s / R2≤1.

59.

2. The optical lens according to claim 1, characterized in that: The inner diameter d0s of the end surface 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 according to claim 1, characterized in that: The outer diameter of the end surface of the lens barrel closest to the object side is smaller than the outer diameter of the end surface of the lens barrel closest to the image side.

4. The optical lens according to claim 1, characterized in that: 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 the following: 1.1≤(R2*N1) / d1m≤2.

62.

5. The optical lens according to claim 1, characterized in that: The center thickness CT1 of the first lens on the optical axis of the optical 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 the following: 1.82≤EP01 / CT1≤3.

25.

6. The optical lens according to claim 1, characterized in that: 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 from the intersection of the image side surface of the first lens and the optical axis to the vertex of the effective radius of the image side surface of the first lens satisfy the following: 1.46≤(CT1+CP1) / SAG12≤2.

87.

7. The optical lens according to claim 1, characterized in that: A center thickness CT2 of the second lens on the optical axis of the optical lens and an axial distance SAG22 from an intersection of the 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 the following: 1.95≤CT2 / |SAG22|≤2.

50.

8. The optical lens according to claim 1, characterized in that: A center thickness CT1 of the first lens on the optical axis of the optical lens and a center thickness CT2 of the second lens on the optical axis satisfy the following: 2.19≤CT2 / CT1≤2.

86.

9. The optical lens according to claim 1, characterized in that: 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 surface of the lens barrel closest to the image side satisfy the following: 0.26≤d0m / (R6*N3)≤2.

24.

10. The optical lens according to claim 1, characterized in that: The at least one spacer element further comprises a second spacer element, the second spacer element being located between the second lens and the third lens and in contact with the image side surface portion of the second lens, wherein, An outer diameter D2s of the object side surface of the second spacer element, a curvature radius 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.

11. The optical lens according to claim 10, characterized in that: The effective focal length f2 of the second lens and the interval EP12 between the first spacing element and the second spacing element satisfy: 1.41≤f2 / EP12≤2.

89.

12. The optical lens according to claim 10, characterized in that: The maximum thickness CP2 of the second spacer element, the interval EP12 between the first spacer element and the second spacer element, and the center thickness CT2 of the second lens on the optical axis of the optical lens satisfy: 1.1≤(CT2+CP2) / EP12≤3.

01.

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

14. The optical lens according to any one of claims 1 to 12, characterized in that: The image side surface of the first lens is 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.

Images