Optical lens

Abstract

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

Description

Technical Field

[0001] The present invention relates to the field of optical imaging technology, 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, the optical lens is required to capture a wider scene. Therefore, the optical lens is required to have a large field of view and high image quality to meet the camera requirements of electronic devices.

[0003] However, the design of a large field of view usually requires a larger object side opening (the inner diameter of the object side end of the lens barrel) to capture edge light and ensure that the light in the entire field of view fully and evenly enters the optical lens. At the same time, a larger object side opening provides a larger inner wall area, which increases the chance of light contacting the inner wall of the lens barrel, thereby causing stray light to be generated, affecting the final image quality.

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

[0006] To achieve the above-mentioned purpose, according to one 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, 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 relationship between an inner diameter d0s of the end surface of the lens barrel closest to the object side and an inner diameter d0m of the end surface of the lens barrel closest to the image side satisfies: 2.12≤d0s / d0m≤2.59; and the relationship between a curvature radius R1 of the object side surface of the first lens, a refractive index N1 of the first lens, an outer diameter D1s of the object side surface of the first spacer element and an inner diameter d1s of the object side surface of the first spacer element satisfies: -4.13≤(R1*N1) / (D1s-d1s)≤0.89.

[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 focal length, a second lens with positive optical focal length and a third lens with positive optical focal length, 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 inner diameter d0m of the end surface of the lens barrel closest to the image side satisfy the following relationship: 2.12≤d0s / d0m≤2.59; and the curvature radius R2 of the image side surface of the first lens, the refractive index N1 of the first lens, and the inner diameter d1s of the object side surface of the first spacer element satisfy the following relationship: 0.42≤(R2*N1) / d1s≤0.88.

[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 having negative optical power, a second lens having positive optical power and a third lens having positive optical power, which are arranged in sequence from the object side to the image side; and wherein the at least one spacer element comprises a first spacer element and a second 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 of the first lens, and the second 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 second lens is between the third lens and partially contacts the image side surface of the second lens; wherein, the inner diameter d0s of the end surface of the lens barrel closest to the object side and the inner diameter d2s of the object side surface of the second spacing element satisfy: 5.46≤d0s / d2s≤7.49; the curvature radius R2 of the image side surface of the first lens, the outer diameter D1s of the object side surface of the first spacing element, the curvature radius R3 of the object side surface of the second lens, and the outer diameter D2s of the object side surface of the second spacing element satisfy: 0.5≤R2*D1s / (R3*D2s)≤1.59.

[0009] Furthermore, an outer diameter D0s of an end surface of the lens barrel closest to the object side and an outer diameter D0m of an end surface of the lens barrel closest to the image side satisfy the following relationship: 1.09≤D0s / D0m≤1.50.

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

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

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

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

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

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

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

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

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

[0019] Furthermore, a curvature radius R5 of the object-side surface of the third lens and an inner diameter d2m of the image-side surface of the second spacing element satisfy: 3.02≤R5 / d2m≤6.28.

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

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

[0022] 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. When the inner diameter d0s of the end face of the lens barrel closest to the object side and the inner diameter d0m of the end face of the lens barrel closest to the image side satisfy the following relationship: 2.12≤d0s / d0m≤2.59, the inner diameter d0s of the end face of the lens barrel closest to the object side is larger than the inner diameter d0m of the end face of the lens barrel closest to the image side, so that the optical lens has a larger object side opening, provides a wider light entrance, allows more edge light to enter the optical lens, and is conducive to increasing the field of view of the optical lens. In addition, the image side opening of the optical lens is smaller, so that the optical lens forms an inverted structure, the lens size of the object side end is larger than the lens size of the image side end, and the large-size lens of the object side end can collect and disperse light more evenly, so that when the light enters the subsequent lens, the light is relatively gentle. This optimization of the light path helps to reduce the violent refraction of the edge light, thereby reducing distortion. However, in this case, when light enters from the larger object side opening, it may be reflected on the edge of the lens and the surface of the spacing element, especially at the edge of the first lens, where the reflection is more obvious, resulting in serious stray light. In order to reduce the stray light generated at the edge of the first lens, the present application constrains (R1*N1) / (D1s-d1s) within a reasonable range to adjust the degree of deflection of light when passing through the first lens, ensure that the light does not generate a large angle deflection, avoid excessive reflection of light at the edge of the first lens, reduce the generation of stray light, and ensure that the first spacing element can effectively block the area where stray light may be generated, while not restricting the normal transmission path of light. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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:

[0024] Figure 1 A dimensioning diagram of an optical lens of an optional embodiment of the present invention is shown;

[0025] Figure 2 A schematic structural diagram of an optical lens according to Embodiment 1-1 of the present invention is shown;

[0026] Figure 3 A schematic structural diagram of an optical lens according to Embodiment 1-2 of the present invention is shown;

[0027] Figures 4 to 7 The axial chromatic aberration, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical lens of the first embodiment of the present invention are respectively shown;

[0028] Figure 8 A schematic structural diagram of an optical lens according to Embodiment 2-1 of the present invention is shown;

[0029] Fig. 9 A schematic structural diagram of an optical lens according to Embodiment 2-2 of the present invention is shown;

[0030] Figures 10 to 13 The axial chromatic aberration, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical lens of the second embodiment of the present invention are respectively shown;

[0031] Fig.14 A schematic structural diagram of an optical lens according to Embodiment 3-1 of the present invention is shown;

[0032] Fig.15 A schematic structural diagram of an optical lens according to Embodiment 3-2 of the present invention is shown;

[0033] Figures 16 to 19 The axial chromatic aberration, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical lens of the third embodiment of the present invention are respectively shown;

[0034] Fig. 20 A schematic structural diagram of an optical lens according to Embodiment 4-1 of the present invention is shown;

[0035] Fig.21 A schematic structural diagram of an optical lens according to Embodiment 4-2 of the present invention is shown;

[0036] Figure 22 to Figure 25 The axial chromatic aberration, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical lens of the fourth embodiment of the present invention are respectively shown;

[0037] Fig.26 A light path diagram of an optical lens of an optional embodiment of the present invention is shown;

[0038] Fig. 27 Shows Fig.26 Schematic diagram of stray light in optical lens;

[0039] Fig.28 An optical path diagram of an example optical lens is shown;

[0040] Fig.29 Shows Fig.28 Schematic diagram of stray light in optical lens;

[0041] Fig.30Another example of an optical lens light path diagram is shown;

[0042] Fig.31 Shows Fig.30 Schematic diagram of stray light in optical lens;

[0043] Fig.32 A scanning electron microscope image showing the flange position of the first lens of an optical lens according to an optional embodiment of the present invention;

[0044] Fig.33 A scanning electron microscope image showing the flange position of the first lens of an example optical lens.

[0045] The above drawings include the following reference numerals:

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

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] In order to solve the problem in the prior art that an optical lens has a large field of view and causes serious stray light, the present invention provides an optical lens.

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

[0055] The optical lens of the present application is composed of a lens barrel, three lenses and at least one spacer element. When the inner diameter d0s of the end face of the lens barrel closest to the object side and the inner diameter d0m of the end face of the lens barrel closest to the image side satisfy the following relationship: 2.12≤d0s / d0m≤2.59, the inner diameter d0s of the end face of the lens barrel closest to the object side is larger than the inner diameter d0m of the end face of the lens barrel closest to the image side, so that the optical lens has a larger object side opening, provides a wider light entrance, allows more edge light to enter the optical lens, and is conducive to increasing the field of view of the optical lens. In addition, the image side opening of the optical lens is smaller, so that the optical lens forms an inverted structure, the lens size of the object side end is larger than the lens size of the image side end, and the large-size lens of the object side end can collect and disperse light more evenly, so that when the light enters the subsequent lens, the light is relatively gentle. This optimization of the light path helps to reduce the violent refraction of the edge light, thereby reducing distortion. However, in this case, when light enters from a larger object side opening, it may be reflected on the edge of the lens and the surface of the spacer element, especially at the edge of the first lens, where the reflection is more obvious, resulting in serious stray light.

[0056] In order to reduce the stray light generated at the edge of the first lens, the present application constrains (R1*N1) / (D1s-d1s) within a reasonable range to adjust the degree of deflection of light when passing through the first lens, ensure that the light will not be deflected at a large angle, avoid excessive reflection of the light at the edge of the first lens, reduce the generation of stray light, and ensure that the first spacing element can effectively block the area where stray light may be generated without restricting the normal transmission path of the light.

[0057] In addition, by constraining (R1*N1) / (D1s-d1s) within a reasonable range, the shape and size of the first lens are optimized. When the flange position of the first lens is subjected to atomization or other light reduction treatment, the feasibility of the treatment will not be limited by the geometric shape or size of the lens. The flange position after atomization or other light reduction treatment can further absorb and scatter edge reflected light, thereby reducing stray light. If (R1*N1) / (D1s-d1s) is less than -4.13, or (R1*N1) / (D1s-d1s) is greater than 0.89, the laser processing head is prone to interference with the lens mold or the optical effective area of ​​the lens during the atomization process, affecting the structure or imaging performance of the lens, and thus the atomization process cannot be performed. Fig.32 When the optical lens satisfies -4.13≤(R1*N1) / (D1s-d1s)≤0.89, the SEM image of the flange position of the first lens is atomized. Fig.33This is a SEM image of the flange position of the first lens of an optical lens in an example. The optical lens does not satisfy -4.13≤(R1*N1) / (D1s-d1s)≤0.89, and the flange position of the first lens cannot be atomized. Therefore, this image can be understood as an enlarged image of the flange position of the first lens without atomization. Fig.32 and Fig.33 By comparison, it can be seen that the flange position after atomization has more microstructures and greater roughness, which leads to better light absorption.

[0058] The flange position refers to the position where the lens and the inner wall of the lens barrel are supported.

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

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

[0061]

[0062] Table 1

[0063] It should be noted that the present application limits (R1*N1) / (D1s-d1s) within a reasonable range to control the deflection of light, optimize the size of lenses and spacer elements, ensure the processing accuracy of parts, and improve the smoothness of the light path to solve the stray light problem caused by d0s / d0m in the range of 2.12 to 2.59. It is particularly suitable for VR / AR lens design that requires a large field of view, small optical distortion, and cost control. When (R1*N1) / (D1s-d1s) meets the above range, the purpose of reducing stray light can be achieved without relying on the optical power of the lens and the surface shape of the lens. The optical power and surface shape of the lens are further optimization of the optical lens on this basis. Each lens can be positive or negative according to the actual design requirements of the optical system, and the surface shape of each lens can also be convex or concave according to the design requirements of the optical system. As long as the optical system satisfies: 2.12≤d0s / d0m≤2.59; -4.13≤(R1*N1) / (D1s-d1s)≤0.89, the purpose of reducing stray light can be achieved.

[0064] For example, the first lens has negative optical power, the second lens has positive optical power, and the third lens has positive optical power. For another example, the image side surface of the first lens is concave; the object side surface of the second lens is convex, the image side surface of the second lens is concave; the object side surface of the third lens is convex; and the image side surface of the third lens is convex. The optical lens can be simulated by software and / or tools such as ZEMAX and CODEV. Preferably, the optical lens can be 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.

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

[0066] In addition, the lens barrel in the present application satisfies 2.12≤d0s / d0m≤2.59 and 1.09≤D0s / D0m≤1.50 at the same time. This arrangement makes the radial dimension of the end face of the lens barrel closest to the object side smaller, which is beneficial to reduce the risk of stray light on the end face of the lens barrel closest to the object side. At the same time, the radial dimension of the end face of the lens barrel closest to the image side is larger, which is convenient for installing the optical lens and other structures.

[0067] In some optional embodiments, the outer 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: -1.33≤D1s / R1≤3.08. This arrangement can ensure that the curvature radius of the object side surface of the first lens and the outer diameter of the first spacing element are reasonably matched, avoiding the degradation of optical performance caused by the excessive curvature of the object side surface of the first lens or the excessively small outer diameter of the first spacing element, such as excessive aberration or stray light.

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

[0069] In summary, by adjusting the ratio of D1s / R1, the shielding efficiency between the first spacer element and the first lens can be ensured, stray light can be reduced, and good lens moldability and assembly stability can be maintained, ultimately achieving the goal of optimizing the overall optical performance of the lens. This precise control is particularly critical in demanding optical applications such as VR / AR, as any tiny optical defects may significantly affect the user experience.

[0070] 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 d1s of the object side surface of the first spacing element satisfy: 0.42≤(R2*N1) / d1s≤0.88. In this way, the deflection angle of the light emitted from the image side surface of the first lens can be optimized, while ensuring that the first spacing element can effectively control stray light and improve optical quality.

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

[0072] In some optional embodiments, the center thickness CT1 of the first lens on the optical axis of the optical lens, the center thickness CT2 of the second lens on the optical axis, and the center thickness CT3 of the third lens on the optical axis satisfy: 2.78≤(CT2+CT3) / CT1≤4.2. Field curvature is a common aberration in optical lenses, which manifests itself as the inability of the central field of view and the edge field of view to form clear images at the same time. By controlling the ratio of (CT2+CT3) / CT1, the center thickness of each lens can be reasonably distributed, thereby optimizing the path of light through the entire optical system and reducing the fluctuation of field curvature. In this way, even at a large field of view angle, objects within the entire field of view can maintain a high degree of clarity. In addition, by controlling the ratio of (CT2+CT3) / CT1, it is ensured that the gaps between the lenses can be further reasonably distributed while each lens is formed, further reducing the fluctuation of the field curvature of the optical lens.

[0073] 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 partially contacts the image side surface of the second lens, wherein the curvature radius R4 of the image side surface of the second lens, the outer diameter D1m of the image side surface of the first spacer element, the curvature radius R3 of the object side surface of the second lens, and the outer diameter D2s of the object side surface of the second spacer element satisfy: 1.52≤R4*D1m / (R3*D2s)≤4.14. By optimizing the curvature radius of the second lens and the outer diameters of the first spacer element and the second spacer element, it is helpful to ensure the supporting width of the second lens and the first spacer element and the second spacer element, thereby ensuring the stability of the optical lens assembly, and at the same time, it is helpful to optimize the light path, reduce the distortion of the light beam when it is transmitted in the second lens, and help improve the imaging quality of the optical lens.

[0074] In some optional embodiments, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the inner diameter d2s of the object side of the second spacer element, and the inner diameter d2m of the image side of the second spacer element satisfy the following relationship: 0.93≤(f2*d2s) / (f3*d2m)≤2.66. Focal length is one of the most important optical parameters of a lens, which determines the effect of light passing through the lens. By controlling the ratio of (f2*d2s) / (f3*d2m) within a reasonable range, the transmission path of light between the second lens and the third lens can be optimized to ensure that the light moves along a preset path. At the same time, the inner diameter of the second spacer element located between the second lens and the third lens is restricted. While ensuring that the light passes smoothly through the inner diameter of the second spacer element, the second spacer element can more effectively block or reduce stray light, further enhancing the improvement effect of stray light. This is particularly important for high-demand imaging systems in VR / AR applications, because stray light can significantly reduce the user experience. In addition, such an arrangement also allows the focal lengths of the second lens and the third lens to match, thereby avoiding imaging offset or blurring caused by focal length mismatch between the two, and ensuring imaging consistency and accuracy.

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

[0076] In some optional embodiments, the air gap T12 between the first lens and the second lens on the optical axis of the optical lens, the air gap T23 between the second lens and the third lens on the optical axis, the maximum thickness CP1 of the first spacing element, and the maximum thickness CP2 of the second spacing element satisfy: 0.29≤(T23*CP2) / (T12*CP1)≤1.1. By limiting (T23*CP2) / (T12*CP1) within a reasonable range, it is helpful to optimize the profiles of the image side surface of the first lens, the object side surface of the second lens, the image side surface of the second lens, and the object side surface of the third lens, and then optimize the deflection angle and transmission path of the light between the first lens, the second lens, and the third lens, reduce the generation of aberrations, and balance the shading effect of the first spacing element and the second spacing element, reduce stray light caused by multiple reflections on the lens surface, and thus improve the imaging quality.

[0077] In some optional embodiments, the outer diameter D2m of the image side surface of the second spacing element and the curvature radius of the image side surface of the third lens satisfy: -5.06≤D2m / R6≤-3.74. By limiting D2m / R6 within a reasonable range, the convergence point of the light behind the third lens can be optimized to ensure that the light is accurately transmitted to the imaging surface, while ensuring that the flange surface of the third lens has sufficient width. Too narrow flange surface width is prone to cause unstable assembly, and even insufficient shielding effect and stray light, while too large flange surface width may block the imaging light. Such a setting helps to find a balance between reducing stray light interference and maintaining normal light transmission, thereby improving the imaging quality of the optical lens, especially in scenes with large field of view and high contrast, while ensuring the stability of the third lens assembly and the assembly yield of the optical lens.

[0078] In some optional embodiments, the radius of curvature R5 of the object side of the third lens and the inner diameter d2m of the image side of the second spacer element satisfy: 3.02≤R5 / d2m≤6.28. Limiting R5 / d2m within a reasonable range can ensure that the light is properly deflected when entering the third lens. At the same time, the shielding effect of the second spacer element reduces stray light and improves the clarity and contrast of the image. If R5 / d2m is too small, the object side of the third lens may be too curved, thereby increasing the difficulty of molding and reducing the assembly stability. If R5 / d2m is too large, the imaging quality of the optical lens may be affected due to insufficient light shielding. By limiting R5 / d2m within a reasonable range, it is ensured that the second spacer element effectively blocks stray light passing through the aperture of the diaphragm, while ensuring the path of light transmission, thereby improving the imaging quality of the optical lens.

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

[0080] The optical lens of the present application is composed of a lens barrel, three lenses and at least one spacer element. When the inner diameter d0s of the end face of the lens barrel closest to the object side and the inner diameter d0m of the end face of the lens barrel closest to the image side satisfy the following relationship: 2.12≤d0s / d0m≤2.59, the inner diameter d0s of the end face of the lens barrel closest to the object side is larger than the inner diameter d0m of the end face of the lens barrel closest to the image side, so that the optical lens has a larger object side opening, provides a wider light entrance, allows more edge light to enter the optical lens, and is conducive to increasing the field of view of the optical lens. In addition, the image side opening of the optical lens is smaller, so that the optical lens forms an inverted structure, the lens size of the object side end is larger than the lens size of the image side end, and the large-size lens of the object side end can collect and disperse light more evenly, so that when the light enters the subsequent lens, the light is relatively gentle. This optimization of the light path helps to reduce the violent refraction of the edge light, thereby reducing distortion. However, in this case, when light enters from a larger object side opening, it may be reflected on the edge of the lens and the surface of the spacer element, especially at the edge of the first lens, where the reflection is more obvious, resulting in serious stray light.

[0081] In order to reduce the stray light generated at the edge of the first lens, the present application constrains (R2*N1) / d1s within a reasonable range to adjust the degree of deflection of the light when passing through the first lens, optimize the deflection angle of the light emitted from the image side of the first lens, ensure that the light will not be deflected at a large angle, avoid excessive reflection of the light at the edge of the first lens, reduce the generation of stray light, and ensure that the first spacing element can effectively block the area where stray light may be generated without restricting the normal transmission path of the light.

[0082] In addition, in another optional embodiment of the present application, an optical lens is further provided, the optical lens comprising 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 with negative optical power, a second lens with positive optical power and a third lens with positive optical power arranged in sequence from the object side to the image side; the at least one spacer element comprises a first spacer element and a second spacer element, the first spacer element is located between the first lens and the second lens and is in contact with the image side surface portion of the first lens, and the second 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, and the The spacer element is located between the second lens and the third lens and contacts the image side surface portion of the second lens; wherein, the inner diameter d0s of the end surface of the lens barrel closest to the object side and the inner diameter d2s of the object side surface of the second spacer element satisfy: 5.46≤d0s / d2s≤7.49; the curvature radius R2 of the image side surface of the first lens, the outer diameter D1s of the object side surface of the first spacer element, the curvature radius R3 of the object side surface of the second lens, and the outer diameter D2s of the object side surface of the second spacer element satisfy: 0.5≤R2*D1s / (R3*D2s)≤1.59.

[0083] The optical lens of the present application is composed of a lens barrel, three lenses and at least one spacer element. The inner diameter d0s of the end face of the lens barrel closest to the object side and the inner diameter d2s of the object side face of the second spacer element satisfy the following relationship: 5.46≤d0s / d2s≤7.49. The inner diameter d0s of the end face of the lens barrel closest to the object side is larger than the inner diameter d2s of the object side face of the second spacer element. d0s is more than five times of d2s. When light passes through the opening of the lens barrel closest to the object side to the central hole of the second spacer element, the light needs to undergo a larger convergence. When passing through the first lens and the second lens, the light is easily deflected to a greater extent. The deflected light is easily reflected by the inner wall surface of the image lens barrel or the optical structure area of ​​the lens, resulting in serious stray light.

[0084] In order to reduce the stray light generated at the edges of the first lens and the second lens, the present application constrains R2*D1s / (R3*D2s) within a reasonable range to adjust the degree of deflection of the light when passing through the first lens and the second lens, especially to adjust the degree of deflection of the light when it is emitted through the object side of the first lens and the degree of deflection of the light when it enters the second lens, optimize the deflection angle of the light emitted from the image side of the first lens, and optimize the deflection angle of the light incident on the object side of the second lens, ensure that the light will not be deflected at a large angle, reduce the generation of stray light, and ensure that the first spacing element and the second spacing element can effectively block the area where stray light may be generated, while not restricting the normal transmission path of the light.

[0085] 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.

[0086] 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.

[0087] Of course, this embodiment may also include other parameter formulas in the above embodiment, which will not be described one by one here.

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

[0089] 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.

[0090] 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.

[0091] 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, D1s, D1m, d2s, d2m, D2s, D2m, d0s, d0m, D0s, D0m, CP1, CP2, EP12, and L are indicated 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 describing the specific embodiments later.

[0092] 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.

[0093] 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.

[0094] It should be noted that any one of the following embodiments 1 to 4 is applicable to all embodiments of the present application.

[0095] Embodiment 1

[0096] like Figures 2 to 7 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.

[0097] 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 and a third lens E3 arranged in sequence from the object side to the image side.

[0098] like Figure 2 Shown is the structural representation of the optical lens of embodiment 1-1.In this example, the object side surface S1 of the first lens is spaced apart from the lens barrel P0, and the outer annular surface of the first lens E1 partially abuts against the inner wall surface 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 partially abut against the image side surface S4 of the second lens and the object side surface S5 of the 3rd lens respectively. The image side surface S6 of the 3rd lens partially abuts against the lens barrel P0.

[0099] 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.

[0100] 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)

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

[0102] Table 2

[0103] In the first 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 concave surface. The object side surface S5 of the third lens is a convex surface, and the image side surface S6 of the third lens is a convex surface. S7 to S10 in 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.

[0104] In Example 1, the effective focal length f1 of the first lens is -0.42 mm, the effective focal length f2 of the second lens is 0.56 mm, the effective focal length f3 of the third lens is 0.60 mm, and the axial distance SAG21 between the intersection of the object side surface of the second lens and the optical axis to the vertex of the effective radius of the object side surface of the second lens is 0.21 mm.

[0105] Table 3 shows the basic structural parameters of the optical lens of Example 1, wherein the units of the radius of curvature and thickness / distance are all millimeters.

[0106]

[0107]

[0108] Table 3

[0109] 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:

[0110]

[0111] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric 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 aspheric surface. Table 4 below gives the high-order coefficients A4, A6, A8, A10, A12, A14, A16, and A18 that can be used for each aspheric mirror surface S1-S6 in Example 1.

[0112] Face number A4 A6 A8 A10 A12 A14 A16 A18 S1 1.38E+00 -5.63E+00 1.97E+01 -5.23E+01 9.76E+01 -1.18E+02 8.33E+01 -2.54E+01 S2 -8.37E+00 8.28E+01 -1.27E+03 1.36E+04 -1.03E+05 4.44E+05 -9.31E+05 6.45E+05 S3 -2.29E+00 3.47E+01 -4.68E+02 5.28E+03 -4.49E+04 1.80E+05 -2.16E+05 0.00E+00 S4 4.85E+00 -1.31E+02 6.06E+03 -1.15E+05 1.42E+06 -2.16E+07 2.94E+08 0.00E+00 S5 7.77E-01 3.86E+00 8.79E+02 -2.32E+04 2.95E+05 -1.88E+06 4.61E+06 0.00E+00 S6 2.38E+00 -4.28E+01 1.06E+03 -1.28E+04 8.67E+04 -2.15E+05 0.00E+00 0.00E+00

[0113] Table 4

[0114] Figure 4 The 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 distortion curve of the optical lens of the first embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles. Figure 7 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.

[0115] according to Figures 4 to 7 It can be seen that the optical lens provided in the first embodiment can achieve good imaging quality.

[0116] Embodiment 2

[0117] like Figures 8 to 13 As shown, the optical lens of the second embodiment is described. Figure 8 The structure diagram of the optical lens of Example 2-1 is shown. Fig. 9 A schematic structural diagram of the optical lens of Example 2-2 is shown.

[0118] like Figure 8 and Fig. 9 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.

[0119] like Figure 8 Shown is the structural representation of the optical lens of embodiment 2-1. In this example, the object side surface S1 of the first lens is spaced apart from the lens barrel P0, and the outer annular surface of the first lens E1 partially abuts against the inner wall surface 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 partially abut against the image side surface S4 of the second lens and the object side surface S5 of the third lens respectively. The image side surface S6 of the third lens partially abuts against the lens barrel P0.

[0120] like Fig. 9 FIG. 2 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 the same as that of Example 2-1, and the relevant description in Example 2-1 may be referred to, and will not be repeated here.

[0121] 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)

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

[0123] Table 5

[0124] In the second 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 concave surface. The object side surface S5 of the third lens is a convex surface, and the image side surface S6 of the third lens is a convex surface.

[0125] In Example 2, the effective focal length f1 of the first lens is -0.61 mm, the effective focal length f2 of the second lens is 1.10 mm, the effective focal length f3 of the third lens is 0.54 mm, and the axial distance SAG21 between the intersection of the object side surface of the second lens and the optical axis to the effective radius vertex of the object side surface of the second lens is 0.15 mm.

[0126] Table 6 shows the basic structural parameters of the optical lens of Example 2, wherein the units of the radius of curvature and thickness / distance are all millimeters.

[0127]

[0128] Table 6

[0129] Table 7 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 2. Among them, the surface shape of each aspherical surface can be defined by the formula (1) given in the above-mentioned Example 1.

[0130] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 5.13E+00 -4.45E+01 2.98E+02 -1.42E+03 4.67E+03 -1.04E+04 1.49E+04 -1.23E+04 4.46E+03 S2 1.26E+01 -1.93E+02 3.17E+03 -5.06E+04 6.29E+05 -5.17E+06 2.52E+07 -6.64E+07 7.39E+07 S3 1.81E+00 -4.47E+01 1.13E+03 -3.25E+04 6.49E+05 -8.35E+06 6.25E+07 -2.46E+08 3.96E+08 S4 3.43E+00 -7.01E+02 7.18E+04 -4.47E+06 1.67E+08 -3.71E+09 4.50E+10 -2.29E+11 0.00E+00 S5 -1.49E+01 4.02E+03 -6.55E+05 6.10E+07 -3.46E+09 1.21E+11 -2.55E+12 2.95E+13 -1.43E+14 S6 8.58E-01 -2.83E+02 1.85E+04 -7.21E+05 1.81E+07 -2.90E+08 2.89E+09 -1.62E+10 3.87E+10

[0131] Table 7

[0132] Fig.10 The 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.11 The astigmatism curve of the optical lens of Example 2 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.12 The distortion curve of the optical lens of the second embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles. Fig.13 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.

[0133] according to Figures 10 to 13 It can be seen that the optical lens provided in the second embodiment can achieve good imaging quality.

[0134] Embodiment 3

[0135] like Figures 14 to 19 As shown, the optical lens of embodiment 3 is described. Fig.14 The structure diagram of the optical lens of Example 3-1 is shown. Fig.15 A schematic structural diagram of the optical lens of Example 3-2 is shown.

[0136] like Fig.14 and Fig.15 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.

[0137] like Fig.14Shown is the structural representation of the optical lens of embodiment 3-1. In this example, the object side surface S1 of the first lens is spaced apart from the lens barrel P0, and the outer annular surface of the first lens E1 partially abuts against the inner wall surface 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 partially abut against the image side surface S4 of the second lens and the object side surface S5 of the third lens respectively. The image side surface S6 of the third lens partially abuts against the lens barrel P0.

[0138] like Fig.15 FIG. 3 is a schematic diagram of the structure of the optical lens of Example 3-2. In this example, the supporting and abutting manner of each spacing element is the same as that of Example 3-1, and the relevant description in Example 3-1 may be referred to, and will not be repeated here.

[0139] 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)

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

[0141] Table 8

[0142] In 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 concave. The object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is convex.

[0143] In Example 3, the effective focal length f1 of the first lens is -0.80 mm, the effective focal length f2 of the second lens is 1.38 mm, the effective focal length f3 of the third lens is 0.61 mm, and the axial distance SAG21 between the intersection of the object side surface of the second lens and the optical axis to the vertex of the effective radius of the object side surface of the second lens is 0.10 mm.

[0144] Table 9 shows the basic structural parameters of the optical lens of Example 3, wherein the units of the radius of curvature and thickness / distance are all millimeters.

[0145]

[0146]

[0147] Table 9

[0148] 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.

[0149] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 1.55E-01 -7.45E+00 2.56E+01 -1.95E+01 -1.87E+02 8.22E+02 -1.61E+03 1.61E+03 -6.71E+02 S2 3.68E+00 -9.57E+01 8.32E+02 -3.95E+03 -3.78E+04 7.44E+05 -5.39E+06 1.91E+07 -2.71E+07 S3 7.15E-01 -3.67E+01 1.36E+03 -4.12E+04 7.50E+05 -8.51E+06 5.79E+07 -2.14E+08 3.29E+08 S4 4.56E+00 -6.92E+02 5.86E+04 -2.10E+06 -2.12E+07 4.52E+09 -1.60E+11 2.50E+12 -1.52E+13 S5 -1.10E+00 1.70E+02 -1.50E+04 9.26E+05 -3.42E+07 7.63E+08 -1.01E+10 7.36E+10 -2.25E+11 S6 1.83E+00 -2.29E+02 1.23E+04 -3.97E+05 8.10E+06 -1.04E+08 8.28E+08 -3.68E+09 7.01E+09

[0150] Table 10

[0151] Fig.16 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.17 The astigmatism curve of the optical lens of Example 3 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.18 The distortion curve of the optical lens of the third embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles. Fig.19 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.

[0152] according to Figures 16 to 19 It can be seen that the optical lens provided in the third embodiment can achieve good imaging quality.

[0153] Embodiment 4

[0154] like Figure 20 to Figure 25 As shown, the optical lens of embodiment 4 is described. Fig. 20 FIG4 is a schematic diagram showing the structure of the optical lens of Example 4-1. Fig.21 A schematic structural diagram of the optical lens of Example 4-2 is shown.

[0155] like Fig. 20 and Fig.21 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.

[0156] like Fig. 20 Shown is the structural representation of the optical lens of embodiment 4-1. In this example, the object side surface S1 of the first lens is spaced apart from the lens barrel P0, and the outer annular surface of the first lens E1 partially abuts against the inner wall surface 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 partially abut against the image side surface S4 of the second lens and the object side surface S5 of the third lens respectively. The image side surface S6 of the third lens partially abuts against the lens barrel P0.

[0157] like Fig.21 , which is a schematic diagram of the structure of the optical lens of Example 4-2. In this example, the supporting and abutting manner of each spacing element is the same as that of Example 4-1, and the relevant description in Example 4-1 may be referred to, and will not be repeated here.

[0158] 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)

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

[0160] Table 11

[0161] In the fourth 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 concave surface. The object side surface S5 of the third lens is a convex surface, and the image side surface S6 of the third lens is a convex surface.

[0162] In Example 4, the effective focal length f1 of the first lens is -0.77 mm, the effective focal length f2 of the second lens is 1.41 mm, the effective focal length f3 of the third lens is 0.59 mm, and the on-axis distance SAG21 between the intersection of the object side surface of the second lens and the optical axis to the vertex of the effective radius of the object side surface of the second lens is 0.10 mm.

[0163] Table 12 shows the basic structural parameters of the optical lens of Example 4, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0164]

[0165]

[0166] Table 12

[0167] 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.

[0168] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 7.69E-01 -1.10E+01 5.08E+01 -1.58E+02 3.35E+02 -4.51E+02 3.26E+02 -6.65E+01 -3.38E+01 S2 5.38E+00 -1.12E+02 1.02E+03 -6.88E+03 2.45E+04 -3.53E+04 0.00E+00 0.00E+00 0.00E+00 S3 3.32E-01 -1.08E+01 2.37E+00 -8.73E+02 8.68E+03 -2.03E+04 0.00E+00 0.00E+00 0.00E+00 S4 5.41E+00 -6.57E+02 5.19E+04 -2.09E+06 4.18E+07 -3.19E+08 0.00E+00 0.00E+00 0.00E+00 S5 -3.32E-01 5.70E+01 -1.99E+03 9.22E+04 -2.21E+06 2.53E+07 -1.11E+08 0.00E+00 0.00E+00 S6 1.43E+00 -1.36E+02 5.00E+03 -1.01E+05 1.17E+06 -6.99E+06 1.72E+07 0.00E+00 0.00E+00

[0169] Table 13

[0170] Fig. 22 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.23 The astigmatism curve of the optical lens of Example 4 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.24 The distortion curve of the optical lens of the fourth embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles. Fig.25 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.

[0171] according to Figure 22 to Figure 25 It can be seen that the optical lens provided in the fourth embodiment can achieve good imaging quality.

[0172] In summary, the optical lenses of Examples 1 to 4 respectively satisfy the relationships shown in Table 14.

[0173]

[0174]

[0175] Table 14

[0176] Table 15 shows the effective focal length of each lens of the optical lens of Examples 1 to 4 (unit: mm).

[0177] Parameters / Examples one two three Four f1 -0.42 -0.61 -0.80 -0.77 f2 0.56 1.10 1.38 1.41 f3 0.60 0.54 0.61 0.59 SAG21 0.21 0.15 0.10 0.10

[0178] Table 15

[0179] The present application also provides an imaging device, 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.

[0180] 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.

[0181] 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.

[0182] 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.

[0183] 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 inner diameter d0s of the end face of the lens barrel closest to the object side is equal to the inner diameter d0s of the end face of the lens barrel closest to the image side. d0m satisfies: 2.12≤d0s / d0m≤2.59; The curvature radius R1 of the object side surface of the first lens, the refractive index N1 of the first lens, the outer diameter D1s of the object side surface of the first spacing element and the inner diameter d1s of the object side surface of the first spacing element satisfy: -4.13≤(R1*N1) / (D1s-d1s)≤0.

89.

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

50.

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

08.

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

88.

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

87.

6. 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, a center thickness CT2 of the second lens on the optical axis, and a center thickness CT3 of the third lens on the optical axis satisfy the following: 2.78≤(CT2+CT3) / CT1≤4.

2.

7. The optical lens according to claim 1, characterized in that: The at least one spacer element further 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, Among them, the curvature radius R4 of the image side surface of the second lens, the outer diameter D1m of the image side surface of the first spacing element, the curvature radius R3 of the object side surface of the second lens, and the outer diameter D2s of the object side surface of the second spacing element satisfy: 1.52≤R4*D1m / (R3*D2s)≤4.

14.

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

67.

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

15.

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

1.

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

74.

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

28.

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

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

Images