Optical lens

Abstract

The invention provides an optical lens. The optical lens comprises a lens barrel, a lens group and a spacing element group, wherein the lens group and the spacing element group are assembled in the lens barrel; the height L of the lens barrel and the effective focal length f of the optical lens meet the following conditions: 0.27 lt; l / flt; 0.30, 0.30; the refractive index N1 of the first lens and the effective focal length f1 of the first lens meet the following condition: 17.22 mmlt; n1 * f1lt; the thickness is 18.96 mm; the spacing distance EP01 between the object side end face of the lens barrel and the object side face of the first spacing element in the extension direction of the optical axis and the edge thickness ET1 of the non-effective diameter area of the first lens meet the following formula: 1.69 lt; eP01 / ET1 < lt >; 2.66); the inner diameter d0s of the object side end surface of the lens barrel and the inner diameter d1s of the object side surface of the first spacing element satisfy the following conditions: 1.18 lt; d0s / d1slt; and 1.25. According to the invention, the problem of poor reliability caused by the fact that an optical lens in the prior art meets the long-focus requirement 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] The imaging system has always been a key factor in differentiating the positioning of different smartphones. From mainstream mid-range phones to top flagship phones, all brands require a main wide-angle lens, and most brands also have an ultra-wide-angle lens. However, telephoto lenses have generally become exclusive to high-end flagship phones. However, with the increasing demand for smartphone imaging systems, telephoto lenses have a tendency to spread from high-end flagship phones to mainstream mid-range phones and even entry-level low-end phones.

[0003] However, when designing a telephoto lens, due to the limited freedom in the design of the front port diameter, it is easy for the force peak at the front edge of the lens to be concentrated at a certain point. During the reliability test, it is easy to cause the front lens to shatter and fail to meet the reliability requirements.

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

[0006] In order to achieve the above object, according to one aspect of the present invention, an optical lens is provided, comprising a lens barrel, a lens group and a spacer element group assembled in the lens barrel,

[0007] The lens group includes a first lens, a second lens, a third lens and a fourth lens in sequence from the object side to the image side along the optical axis;

[0008] The spacer element group includes at least a first spacer element, the first spacer element is located between the first lens and the second lens and is in at least partial contact with the image side surface of the first lens;

[0009] The height of the lens barrel L and the effective focal length f of the optical lens satisfy: 0.27 <L / f<0.30;

[0010] The refractive index N1 of the first lens and the effective focal length f1 of the first lens satisfy: 17.22 mm <N1×f1<18.96mm;

[0011] The distance EP01 between the object side end face of the lens barrel and the object side face of the first spacing element along the optical axis extension direction and the edge thickness ET1 of the non-effective diameter area of ​​the first lens meet the following conditions: 1.69 <EP01 / ET1<2.66;

[0012] The inner diameter d0s of the object-side end face of the lens barrel and the inner diameter d1s of the object-side face of the first spacer element satisfy: 1.18 < d0s / d1s < 1.25.

[0013] According to another aspect of the present invention, there is provided an optical lens. The optical lens includes a lens barrel, a lens group and a spacer element group assembled in the lens barrel. The lens group sequentially includes a first lens with a positive optical power, a second lens with a positive optical power, a third lens with a negative optical power, and a fourth lens with a positive optical power along the optical axis from the object side to the image side; the spacer element group includes at least a first spacer element, the first spacer element is located between the first lens and the second lens and is at least partially in contact with the image-side face of the first lens; the lens barrel height L and the effective focal length f of the optical lens satisfy: 0.27 < L / f < 0.30; the refractive index N1 of the first lens and the effective focal length f1 of the first lens satisfy: 17.22 mm < N1×f1 < 18.96 mm; the central thickness CT1 of the first lens, the air gap T12 on the optical axis between the first lens and the second lens, and the spacing distance EP01 between the object-side end face of the lens barrel and the object-side face of the first spacer element along the optical axis extension direction satisfy: 1.29 < (CT1 + T12) / EP01 < 1.72; the effective focal length f1 of the first lens, the inner diameter d0s of the object-side end face of the lens barrel and the inner diameter d1s of the object-side face of the first spacer element satisfy: 5.65 < f1 / (d0s - d1s) < 7.65.

[0014] According to another aspect of the present invention, there is provided an optical lens. The optical lens includes a lens barrel, a lens group and a spacer element group assembled in the lens barrel. The lens group sequentially includes a first lens with a positive optical power, a second lens with a positive optical power, a third lens with a negative optical power, and a fourth lens with a positive optical power along the optical axis from the object side to the image side; the spacer element group includes at least a first spacer element, the first spacer element is located between the first lens and the second lens and is at least partially in contact with the image-side face of the first lens; the air gap T12 on the optical axis between the first lens and the second lens and the sum ∑AT of the air gaps between adjacent two lenses between the first lens and the fourth lens satisfy: 0.05 < T12 / ∑AT < 0.17, the curvature radius R2 of the image-side face of the first lens and the curvature radius R3 of the object-side face of the second lens satisfy: -25.55 < R3 / R2 < 29.93; the maximum thickness CP1 of the first spacer element in the optical axis extension direction and the air gap T12 on the optical axis between the first lens and the second lens satisfy: 5.45 < (CP1 + EP12) / T12 < 21.25.

[0015] Furthermore, an axial distance SAG11 between the intersection of the object side surface of the first lens and the optical axis to the vertex of the effective radius of the non-effective diameter area of ​​the object side surface of the first lens and an outer diameter D1s of the object side surface of the first spacer element satisfy: 0.09<|SAG11| / D1s <0.12.

[0016] Furthermore, the center thickness CT1 of the first lens, the air gap T12 between the first lens and the second lens on the optical axis, and the spacing distance EP01 between the object side end face of the lens barrel and the object side face of the first spacing element along the extension direction of the optical axis satisfy: 1.29<(CT1+T12) / EP01<1.72.

[0017] Furthermore, the curvature radius R1 of the object side surface of the first lens and the outer diameter D0s of the object side end surface of the lens barrel satisfy: 0.95 <R1 / D0s<1.19。

[0018] Furthermore, the outer diameter D1s of the object side surface of the first spacer element, the distance EP01 between the object side end surface of the lens barrel and the object side surface of the first spacer element along the optical axis extension direction, and the center thickness CT1 of the first lens satisfy: 8.96 mm <D1s / (EP01 / CT1)<10.89mm。

[0019] Furthermore, the air gap T12 between the first lens and the second lens on the optical axis and the sum ΣAT of the air gaps between two adjacent lenses from the first lens to the fourth lens satisfy: 0.05 <T12 / ∑AT<0.17。

[0020] Furthermore, the effective focal length f1 of the first lens, the inner diameter d0s of the object side end surface of the lens barrel and the inner diameter d1s of the object side surface of the first spacing element satisfy the following relationship: 5.65 <f1 / (d0s-d1s)<7.65。

[0021] Furthermore, the spacer element group further includes a first auxiliary spacer element, the first auxiliary spacer element is located between the first spacer element and the second lens and is in at least partial contact with the image side surface of the first spacer element, and the outer diameter D1bm of the image side surface of the first auxiliary spacer element and the inner diameter d1bm of the image side surface of the first auxiliary spacer element satisfy the following relationship: 1.12 <D1bm / d1bm<1.30。

[0022] Furthermore, the spacer element group also includes a second spacer element, which is located between the second lens and the third lens, and the second spacer element is in partial contact with the image side surface of the second lens, and the maximum thickness CP1 of the first spacer element in the extension direction of the optical axis, the spacing distance EP12 between the image side surface of the first spacer element and the object side surface of the second spacer element along the extension direction of the optical axis, and the center thickness CT2 of the first lens satisfy: 1.38<(CP1+EP12) / CT2<1.65.

[0023] Further, a curvature radius R3 of the object side surface of the second lens, a curvature radius R4 of the image side surface of the second lens, and an inner diameter d2s of the object side surface of the second spacing element satisfy: 2.49<(R3+R4) / d2s<9.56.

[0024] Furthermore, the combined focal length f12 of the first lens and the second lens, the maximum thickness CP1 of the first spacing element in the direction in which the optical axis extends, and the spacing distance EP12 between the image side surface of the first spacing element and the object side surface of the second spacing element in the direction in which the optical axis extends satisfy: 4.47 <f12 / (CP1+EP12)<5.49。

[0025] Further, the spacer element group further includes a second spacer element and a third spacer element, the second spacer element is located between the second lens and the third lens and contacts the image side surface portion of the second lens, the third spacer element is located between the third lens and the fourth lens and contacts the image side surface portion of the third lens, the minimum inner diameter of the first spacer element is greater than the minimum inner diameter of the second spacer element, the minimum inner diameter of the second spacer element is greater than the minimum inner diameter of the third spacer element,

[0026] The inner diameter d1s of the object side surface of the first spacing element and the inner diameter d2s of the object side surface of the second spacing element satisfy: 0.77 <d2s / d1s<0.84;

[0027] The inner diameter d3s of the object side surface of the third spacing element and the inner diameter d2s of the object side surface of the second spacing element satisfy: 0.85 <d3s / d2s<0.89;

[0028] The inner diameter d1m of the image side surface of the first spacing element and the inner diameter d2m of the image side surface of the second spacing element satisfy: 0.81 <d2m / d1m<0.90;

[0029] The inner diameter d3m of the image side surface of the third spacing element and the inner diameter d2m of the image side surface of the second spacing element satisfy: 0.86 <d3m / d2m<0.89。

[0030] Furthermore, the optical lens further comprises an auxiliary lens barrel, the auxiliary lens barrel is located on the object side of the lens barrel, the connection between the auxiliary lens barrel and the lens barrel, the height L of the lens barrel, the height Lb of the auxiliary lens barrel, the outer diameter D0bm of the image side end surface of the auxiliary lens barrel, and the inner diameter d0bs of the object side end surface of the auxiliary lens barrel satisfy the following conditions: 1.98 mm-1 <L / Lb / (D0bm-d0bs)<2.34mm-1。

[0031] Furthermore, the inner diameter d0bs of the object side end surface of the auxiliary lens barrel and the maximum effective radius DT11 of the object side surface of the first lens satisfy the following relationship: 1.96 <d0bs / DT11<2.04。

[0032] Further, the first lens has a positive optical power, the second lens has a positive optical power, the third lens has a negative optical power, and the fourth lens has a positive optical power.

[0033] Further, the object side surface of the first lens is convex; 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 concave; the image side surface of the fourth lens is convex.

[0034] Applying the technical solution of the present invention, the optical lens includes a lens barrel, a lens group and a spacer element group assembled in the lens barrel. The lens group sequentially includes a first lens, a second lens, a third lens and a fourth lens along the optical axis from the object side to the image side; the spacer element group includes at least a first spacer element, and the first spacer element is located between the first lens and the second lens and is at least partially in contact with the image side surface of the first lens; the relationship between the lens barrel height L and the effective focal length f of the optical lens satisfies: 0.27 < L / f < 0.30; the relationship between the refractive index N1 of the first lens and the effective focal length f1 of the first lens satisfies: 17.22 mm < N1×f1 < 18.96 mm; the relationship between the spacing distance EP01 along the optical axis extension direction between the object side end surface of the lens barrel and the object side surface of the first spacer element and the edge thickness ET1 of the non-effective diameter region of the first lens satisfies: 1.69 < EP01 / ET1 < 2.66; the relationship between the inner diameter d0s of the object side end surface of the lens barrel and the inner diameter d1s of the object side surface of the first spacer element satisfies: 1.18 < d0s / d1s < 1.25.

[0035] The optical lens of the present application is composed of a lens barrel, four lenses and at least one spacer element. When the relationship between the lens barrel height L and the effective focal length f of the optical lens satisfies: 0.27 < L / f < 0.30; and the relationship between the refractive index N1 of the first lens and the effective focal length f1 of the first lens satisfies 17.22 mm < N1×f1 < 18.96 mm, by restricting the focal length of the first lens and the optical lens and the lens barrel height, the convergence degree of light passing through the first lens is optimized, so that the light converges reasonably in the subsequent space to achieve long focal length imaging. However, the aperture of the long focal length lens is relatively small, resulting in relatively concentrated force on the edge of the first lens. In order to improve the convergence degree of light passing through the first lens, the first lens can be made of glass material. However, the glass material has low toughness, resulting in a risk of cracking at the edge of the first lens during the reliability test, making the optical lens unable to meet the reliability requirements.

[0036] In order not to affect the telephoto performance of the optical lens and the degree of convergence of light when passing through the first lens, the present application constrains EP01 / ET1 and d0s / d1s within a reasonable range to control the space at the front end of the first lens so as to provide an installation position for the pressure ring. The pressure ring can not only share part of the stress of the lens barrel, but also abut against the object side of the first lens, so that the position where the first lens and the pressure ring abut is subjected to the pressure of the pressure ring, thereby dispersing the force on the first lens, effectively avoiding the risk of glass lens breakage, improving the reliability of the optical lens, and ensuring the stability of the lens assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] 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:

[0038] Figure 1 A dimensioning diagram of an optical lens of an optional embodiment of the present invention is shown;

[0039] Figure 2 A dimensioning diagram of an optical lens according to another optional embodiment of the present invention is shown;

[0040] Figure 3 A schematic structural diagram of an optical lens according to Embodiment 1-1 of the present invention is shown;

[0041] Figure 4 A schematic structural diagram of an optical lens according to Embodiment 1-2 of the present invention is shown;

[0042] Figure 5 A schematic structural diagram of an optical lens according to Embodiment 1 to 3 of the present invention is shown;

[0043] Figures 6 to 8 The axial chromatic aberration, astigmatism curve and distortion curve of the optical lens of the first embodiment of the present invention are respectively shown;

[0044] Fig. 9 A schematic structural diagram of an optical lens according to Embodiment 2-1 of the present invention is shown;

[0045] Fig.10 A schematic structural diagram of an optical lens according to Embodiment 2-2 of the present invention is shown;

[0046] Fig.11 A schematic structural diagram of an optical lens according to Embodiment 2-3 of the present invention is shown;

[0047] Figure 12 to Figure 14 The axial chromatic aberration, astigmatism curve and distortion curve of the optical lens of the second embodiment of the present invention are respectively shown;

[0048] Fig.15 A schematic structural diagram of an optical lens according to Embodiment 3-1 of the present invention is shown;

[0049] Fig.16 A schematic structural diagram of an optical lens according to Embodiment 3-2 of the present invention is shown;

[0050] Fig.17 A schematic structural diagram of an optical lens according to Embodiment 3-3 of the present invention is shown;

[0051] Figures 18 to 20 The axial chromatic aberration, astigmatism curve and distortion curve of the optical lens of the third embodiment of the present invention are respectively shown;

[0052] Fig.21 A simulation diagram of the overall stress of an optical lens at a first lens position according to an optional embodiment of the present invention is shown;

[0053] Fig. 22 Shows Fig.21 A stress simulation diagram of the optical lens in the side view direction at the first lens position;

[0054] Fig.23 A simulation diagram of the overall stress of an optical lens at a first lens position in an example is shown;

[0055] Fig.24 Shows Fig.23 Stress simulation diagram of the optical lens in the side view direction at the first lens position.

[0056] The above drawings include the following reference numerals:

[0057] 10. supporting groove; 20. pressing ring; P0b, auxiliary lens barrel; P0, lens barrel; E1, first lens; P1, first spacing element; P1b, first auxiliary spacing element; P1c, second auxiliary spacing element; E2, second lens; P2, second spacing element; E3, third lens; P3, third spacing element; E4, fourth lens; S1, object side surface of the first lens; S2, image side surface of the first lens; S3, object side surface of the second lens; S4, image side surface of the second lens; S5, object side surface of the third lens; S6, image side surface of the third lens; S7, object side surface of the fourth lens; S8, image side surface of the fourth lens. DETAILED DESCRIPTION

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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 concave and convex. 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 this application, the left side is the object side and the right side is the image side.

[0064] In order to solve the problem that the optical lens in the prior art has poor reliability due to meeting the telephoto requirement, the present invention provides an optical lens.

[0065] like Figures 1 to 20As shown in the figure, the optical lens includes a lens barrel, a lens group and a spacer element group assembled in the lens barrel. The lens group includes a first lens, a second lens, a third lens and a fourth lens in sequence from the object side to the image side along the optical axis. The spacer element group includes at least a first spacer element. The first spacer element is located between the first lens and the second lens and is at least partially in contact with the image side surface of the first lens. The relationship between the lens barrel height L and the effective focal length f of the optical lens satisfies: 0.27 < L / f < 0.30. The relationship between the refractive index N1 of the first lens and the effective focal length f1 of the first lens satisfies: 17.22mm < N1×f1 < 18.96mm. The relationship between the spacing distance EP01 between the object side end face of the lens barrel and the object side surface of the first spacer element along the optical axis extension direction and the edge thickness ET1 of the non-effective diameter region of the first lens satisfies: 1.69 < EP01 / ET1 < 2.66. The relationship between the inner diameter d0s of the object side end face of the lens barrel and the inner diameter d1s of the object side surface of the first spacer element satisfies: 1.18 < d0s / d1s < 1.25.

[0066] The optical lens of the present application is composed of a lens barrel, four lenses and at least one spacer element. When the relationship between the lens barrel height L and the effective focal length f of the optical lens satisfies: 0.27 < L / f < 0.30, and the relationship between the refractive index N1 of the first lens and the effective focal length f1 of the first lens satisfies 17.22mm < N1×f1 < 18.96mm, by restricting the focal length of the first lens and the optical lens and the lens barrel height, the convergence degree of light passing through the first lens is optimized, so that the light converges reasonably in the subsequent space to achieve long focal length imaging. However, the aperture of the long focal length lens is relatively small, resulting in relatively concentrated stress on the edge of the first lens. In order to improve the convergence degree of light passing through the first lens, the first lens can be made of glass material. However, the glass material has low toughness, resulting in a risk of cracking at the edge of the first lens during the reliability test, making the optical lens unable to meet the reliability requirements.

[0067] In order not to affect the long focal length performance of the optical lens and the convergence degree of light passing through the first lens, the present application constrains both EP01 / ET1 and d0s / d1s within a reasonable range to control the space at the front end of the first lens, so as to provide an installation position for the retaining ring 20. The retaining ring 20 can not only share part of the stress of the lens barrel, but also abut against the object side surface of the first lens, so that the position where the first lens abuts against the retaining ring 20 is subjected to the pressure of the retaining ring 20, thereby dispersing the force on the first lens, effectively avoiding the risk of cracking of the glass lens, improving the reliability of the optical lens, and ensuring the stability of the lens group erection.

[0068] Table 1 below shows a comparison of the stress simulation diagrams of an optional embodiment of the present application and the optical lens in the prior art.

[0069] Table 1

[0070]

[0071] In addition, referring to Table 1 and Figure 21 to Figure 24 as shown, Fig.21 shows the overall stress simulation diagram of the optical lens at the first lens position when L / f = 0.28, N1×f1 = 18.96, EP01 / ET1 = 1.90, and d0s / d1s = 1.24. Fig. 22 shows the stress simulation diagram of the optical lens at the first lens position in the side view direction when L / f = 0.28, N1×f1 = 18.96, EP01 / ET1 = 1.90, and d0s / d1s = 1.24. It can be seen from Fig.21 and Fig. 22 that the stress is mainly concentrated on the object side surface of the first lens. Fig.23 shows the overall stress simulation diagram of the optical lens at the first lens position when L / f = 0.28, N1×f1 = 18.96, EP01 / ET1 = 1.47, and d0s / d1s = 1.09. Fig.24 shows the stress simulation diagram of the optical lens at the first lens position in the side view direction when L / f = 0.28, N1×f1 = 18.96, EP01 / ET1 = 1.47, and d0s / d1s = 1.09. It can be seen from Fig.23 and Fig.24 that the stress is mainly concentrated on the outer ring surface position of the first lens. From the above Table 1 and Fig.21 and Fig.23 it can be known that the stress concentration degree of the first lens in Lens 1 is relatively high, concentrated at the position where the first lens abuts against the inner wall surface of the lens barrel, and the stress peak value is relatively large. When the first lens is made of glass, it is more likely to break. While the stress on the first lens in Lens 2 is relatively uniform and the stress peak value is relatively small. When the first lens is made of glass, it is not easy to break. And when EP01 / ET1 is greater than 2.66 and d0s / d1s is greater than 1.25, the front-end space of the first lens is relatively large, resulting in the lens group being unable to be stably assembled. Therefore, there is no stress simulation diagram of Lens 3.

[0072] The above-mentioned Lens 1 and Lens 3 can be understood as lenses in the prior art, while Lens 2 is the optical lens under application. From the above Table 1 and Figure 21 to Figure 24 it can be known that the optical lens has good reliability when 0.27 < L / f < 0.30, 17.22 mm < N1×f1 < 18.96 mm, 1.69 < EP01 / ET1 < 2.66, and 1.18 < d0s / d1s < 1.25.

[0073] It should be noted that in this application, EP01 / ET1 and d0s / d1s are restricted within a reasonable range to control the space at the front end of the first lens within a reasonable range, so as to solve the problem that when L / f is in the range of 0.27 to 0.33 and N1×f1 is in the range of 17.22 mm to 18.96 mm, the first lens is prone to breakage when it is a glass lens. This is particularly applicable to the design of telephoto lenses. When EP01 / ET1 and d0s / d1s meet the above ranges, the purpose of reducing the stress concentration of the first lens and improving the reliability can be achieved, which does not depend 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 optimizations of the optical lens on this basis. Each lens can be positive or negative according to the design requirements of the actual 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: 0.27 < L / f < 0.30, 17.22 mm < N1×f1 < 18.96 mm, 1.69 < EP01 / ET1 < 2.66, 1.18 < d0s / d1s < 1.25, it can meet the requirements of telephoto lenses and reliability requirements at the same time.

[0074] For example, the first lens has a positive optical power, the second lens has a positive optical power, the third lens has a negative optical power, and the fourth lens has a positive optical power. Another example is that the object side of the first lens is convex, the object side of the second lens is convex, the image side of the second lens is concave, the object side of the third lens is convex, the image side of the third lens is concave, and the image side of the fourth lens is convex. The optical lens can be simulated by software and / or tools such as ANSYS, ABAQUS, etc. The optical lens in this application is simulated by ANSYS. During the simulation using software and / or tools such as the above, the surface shape of each lens can be simulated according to the built-in surface shape of the software and / or tool used and adjusted appropriately.

[0075] In some alternative embodiments, the axial distance SAG11 between the intersection of the object side of the first lens and the optical axis and the vertex of the effective radius of the non-effective diameter region of the object side of the first lens and the outer diameter D1s of the object side of the first spacer element satisfy: 0.09 < |SAG11| / D1s < 0.12. By restricting |SAG11| / D1s within a reasonable range, the bending degree of the object side of the first lens and the size of the first lens can be ensured, and at the same time, the bearing area between the first spacer element and the first lens can be ensured, which is beneficial to ensuring the assembly stability of the optical lens.

[0076] In some alternative embodiments, the following relationship is satisfied among the central thickness CT1 of the first lens, the air gap T12 between the first lens and the second lens along the optical axis, and the spacing distance EP01 between the object-side end face of the lens barrel and the object-side surface of the first spacer element along the optical axis extension direction: 1.29 < (CT1 + T12) / EP01 < 1.72. By restricting (CT1 + T12) / EP01 within a reasonable range, the edge thickness and the central thickness of the first lens can be ensured to be within a reasonable range, thereby ensuring the shape of the first lens. At the same time, interference between the first lens and the second lens can be avoided, which is beneficial to improving the structural stability.

[0077] In some alternative embodiments, the following relationship is satisfied between the curvature radius R1 of the object-side surface of the first lens and the outer diameter D0s of the object-side end face of the lens barrel: 0.95 < R1 / D0s < 1.19. If R1 / D0s is less than 0.95, the curvature radius of the object-side surface of the first lens is relatively small, which will cause the refraction intersection point to be biased to the right, resulting in a relatively large degree of deflection of light rays. At the same time, some imaging light rays cannot enter the effective diameter region of the object-side surface of the first lens. If R1 / D0s is greater than 1.19, the curvature radius of the object-side surface of the first lens is relatively large, which will cause the refraction intersection point to be biased to the left. At the same time, some non-imaging light rays will enter the effective diameter region of the object-side surface of the first lens, affecting the imaging quality. Restricting R1 / D0s within a reasonable range can ensure the imaging quality of the optical lens.

[0078] In some alternative embodiments, the following relationship is satisfied among the outer diameter D1s of the object-side surface of the first spacer element, the spacing distance EP01 between the object-side end face of the lens barrel and the object-side surface of the first spacer element along the optical axis extension direction, and the central thickness CT1 of the first lens: 8.96 mm < D1s / (EP01 / CT1) < 10.89 mm. By restricting D1s / (EP01 / CT1) within a reasonable range, while ensuring that the central thickness and the edge thickness of the first lens are within a reasonable range, the structural shape of the first lens can be ensured. At the same time, the stability of the bearing between the first lens and the first spacer element can be ensured. If D1s / (EP01 / CT1) is greater than 10.89 mm, it means that D1s is relatively large, which is likely to cause an increase in the size of the optical lens and is not conducive to the miniaturization of the optical lens. Or it means that CT1 is large and EP01 is small, which is likely to make it difficult to fabricate the shape of the first lens. If D1s / (EP01 / CT1) is less than 8.96 mm, it means that D1s is relatively small, which is likely to cause unstable bearing between the first spacer element and the first lens. Or it means that CT1 is small and EP01 is large, which is likely to make it difficult to fabricate the shape of the first lens. At the same time, it is also likely to affect the refraction path of the predetermined light path in the first lens.

[0079] In some alternative embodiments, the air gap T12 between the first lens and the second lens on the optical axis and the sum ∑AT of the air gaps between two adjacent lenses among the first lens to the fourth lens satisfy: 0.05 < T12 / ∑AT < 0.17. If T12 / ∑AT is less than 0.05, it is likely to result in a small air gap T12 between the first lens and the second lens on the optical axis, and interference is likely to occur between the first lens and the second lens. If T12 / ∑AT is greater than 0.17, it is not conducive to the rapid convergence of light rays into the second lens, and it is not conducive to meeting the requirements of telephoto performance. By restricting T12 / ∑AT within a reasonable range, it can be ensured that after the light rays are converged by the first lens, they can quickly enter the second lens, which is conducive to the rapid convergence of light rays, and thus conducive to meeting the requirements of telephoto performance.

[0080] In some alternative embodiments, the effective focal length f1 of the first lens, the inner diameter d0s of the object-side end face of the lens barrel, and the inner diameter d1s of the object-side face of the first spacer element satisfy: 5.65 < f1 / (d0s - d1s) < 7.65. By restricting f1 / (d0s - d1s) within a reasonable range, the degree of deflection of light rays passing through the first lens can be ensured, which is conducive to the imaging light rays passing smoothly through the inner diameter of the object-side end face of the lens barrel and the inner diameter of the object-side face of the first spacer element, reducing the reflection of large-angle deflected light rays hitting the inner wall of the lens barrel or the first spacer element, and is conducive to reducing the risk of stray light generated at the front end of the optical lens.

[0081] In some alternative embodiments, the spacer element group further includes a first auxiliary spacer element. The first auxiliary spacer element is located between the first spacer element and the second lens and is at least partially in contact with the image-side face of the first spacer element. The outer diameter D1bm of the image-side face of the first auxiliary spacer element and the inner diameter d1bm of the image-side face of the first auxiliary spacer element satisfy: 1.12 < D1bm / d1bm < 1.30. When the gap between the first lens and the second lens is relatively large, in order to ensure the assembly stability of the lenses, a spacer element with a relatively thick thickness is usually used between the two to ensure the supporting force on the first lens and the second lens. At the same time, in order to improve the stray light of the first spacer element with a relatively large thickness, the first auxiliary spacer element is added. When the first auxiliary spacer element satisfies the above conditional formula, the stray light reflected onto the first spacer element can be effectively improved through the aperture adjustment of the first auxiliary spacer element, thereby improving the imaging quality.

[0082] In some optional embodiments, the spacer element group further includes a second spacer element, the second spacer element is located between the second lens and the third lens, and the second spacer element is in contact with the image side surface of the second lens, and the maximum thickness CP1 of the first spacer element in the direction of extension of the optical axis, the spacing distance EP12 between the image side surface of the first spacer element and the object side surface of the second spacer element along the direction of extension of the optical axis, and the center thickness CT2 of the first lens satisfy: 1.38<(CP1+EP12) / CT2<1.65. By limiting (CP1+EP12) / CT2 within a reasonable range, the thickness ratio of the second lens can be effectively controlled within a reasonable range, ensuring the molding stability of the second lens and effectively avoiding the risk of assembly deformation of the second lens during the assembly process.

[0083] In some optional embodiments, the curvature radius R3 of the object side surface of the second lens, the curvature radius R4 of the image side surface of the second lens, and the inner diameter d2s of the object side surface of the second spacer element satisfy: 2.49<(R3+R4) / d2s<9.56. If (R3+R4) / d2s is greater than 9.56, the curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens are too large, while the inner diameter d2s of the object side surface of the second spacer element is too small, which will cause the edge light passing through the second lens to fail to pass through the second spacer element smoothly, affecting the imaging quality. If (R3+R4) / d2s is less than 2.49, the curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens are too small, while the inner diameter d2s of the object side surface of the second spacer element is too large, which will cause non-imaging light to enter the subsequent imaging system, affecting the imaging quality, and there may also be a risk of light leakage. By limiting R3+R4) / d2s to the range of 2.49 to 9.56, the curvature radii of the object side and image side of the second lens are ensured to match the inner diameter of the second spacing element, thereby reducing the generation of stray light while ensuring that the imaging light passes smoothly through the second spacing element.

[0084] In some alternative embodiments, the combined focal length f12 of the first lens and the second lens, the maximum thickness CP1 of the first spacer element in the optical axis extension direction, and the spacing distance EP12 between the image side surface of the first spacer element and the object side surface of the second spacer element in the optical axis extension direction satisfy: 4.47 < f12 / (CP1 + EP12) < 5.49. By controlling the relationship between the combined focal length of the first lens and the second lens, the maximum thickness of the first spacer element in the optical axis extension direction, and the spacing distance between the image side surface of the first spacer element and the object side surface of the second spacer element in the optical axis extension direction, the edge distance between the first lens and the second lens and the edge thickness of the second lens can be constrained within a reasonable range, reducing the interference generated during the assembly of the first lens and the second lens, avoiding the problem that the interference during the assembly process affects the lens performance due to the too-close edge distance between the first lens and the second lens, and at the same time, avoiding the problem of unstable assembly caused by too large a distance between the two or too thin an edge thickness of the second lens, improving the stability of the optical lens assembly, ensuring the performance of light transmission in the first lens and the second lens while ensuring the stability of the optical lens assembly, reducing the generation of stray light, and at the same time ensuring the refractive performance of the first lens and the second lens for light, and ensuring the imaging performance of the optical lens.

[0085] In some alternative embodiments, the spacer element group further includes a second spacer element and a third spacer element. The second spacer element is located between the second lens and the third lens and contacts the image-side surface portion of the second lens. The third spacer element is located between the third lens and the fourth lens and contacts the image-side surface portion of the third lens. The minimum inner diameter of the first spacer element is greater than the minimum inner diameter of the second spacer element, and the minimum inner diameter of the second spacer element is greater than the minimum inner diameter of the third spacer element. The ratio between the inner diameter d1s of the object-side surface of the first spacer element and the inner diameter d2s of the object-side surface of the second spacer element satisfies: 0.77 < d2s / d1s < 0.84; the ratio between the inner diameter d3s of the object-side surface of the third spacer element and the inner diameter d2s of the object-side surface of the second spacer element satisfies: 0.85 < d3s / d2s < 0.89; the ratio between the inner diameter d1m of the image-side surface of the first spacer element and the inner diameter d2m of the image-side surface of the second spacer element satisfies: 0.81 < d2m / d1m < 0.90; the ratio between the inner diameter d3m of the image-side surface of the third spacer element and the inner diameter d2m of the image-side surface of the second spacer element satisfies: 0.86 < d3m / d2m < 0.89. By designing the minimum inner diameters of the first spacer element, the second spacer element, and the third spacer element to gradually decrease, it is beneficial for the light to show a gradually shrinking trend during the transmission from the first lens to the fourth lens. While ensuring the telephoto performance of the optical lens, the first spacer element, the second spacer element, and the third spacer element can effectively absorb stray light to ensure the imaging quality of the optical lens. In addition, by optimizing the ratio of the inner diameter of the object-side surface of the first spacer element to the inner diameter of the object-side surface of the second spacer element and the ratio of the inner diameter of the image-side surface of the first spacer element to the inner diameter of the image-side surface of the second spacer element, the light emitted from the first lens can smoothly enter the second lens and then be emitted from the second lens and enter the third lens, which is beneficial for controlling the deflection degree of the light in the second lens, avoiding large-angle deflection of the light at the second lens, and facilitating the smooth transition of the light from the first lens to the third lens. By optimizing the ratio of the inner diameter of the object-side surface of the third spacer element to the inner diameter of the object-side surface of the second spacer element and the ratio of the inner diameter of the image-side surface of the third spacer element to the inner diameter of the image-side surface of the second spacer element, the light emitted from the second lens can smoothly enter the third lens and then be emitted from the third lens and enter the fourth lens, which is beneficial for controlling the deflection degree of the light in the third lens, avoiding large-angle deflection of the light at the third lens, and facilitating the smooth transition of the light from the second lens to the fourth lens. By restricting the inner diameter sizes of the first spacer element, the second spacer element, and the third spacer element, it is beneficial for the light to smoothly transition between the second lens and the third lens, reduce large-angle deflection, reduce the generation of stray light, improve the imaging quality, and at the same time facilitate the optical lens to meet the requirements of image height.

[0086] In some alternative embodiments, the optical lens further includes an auxiliary barrel. The auxiliary barrel is located on the object side of the barrel. The connection between the auxiliary barrel and the barrel, the height L of the barrel, the height Lb of the auxiliary barrel, the outer diameter D0bm of the image-side end face of the auxiliary barrel, and the inner diameter d0bs of the object-side end face of the auxiliary barrel satisfy: 1.98 mm -1 <L / Lb / (D0bm - d0bs) < 2.34 mm -1 . Since the inner diameter d0s of the object-side end face of the barrel in the present application is greater than the inner diameter d1s of the object-side face of the first spacer element, more marginal rays enter the object-side end face of the barrel, making it easy to form stray light. By adding the auxiliary barrel, part of the light entering the optical lens can be blocked on the object side of the barrel to reduce the amount of marginal rays entering and improve the imaging quality of the optical lens. By controlling the relationship between the height of the barrel, the height of the auxiliary barrel, the outer diameter of the image-side end face of the auxiliary barrel, and the inner diameter of the object-side end face of the auxiliary barrel, while ensuring the overall size of the optical lens, the degree of blocking of the marginal rays by the auxiliary barrel can be controlled. While ensuring that the optical lens meets the telephoto performance, the entry of non-imaging marginal rays into the optical system can be reduced to improve the imaging quality of the optical lens.

[0087] In some alternative embodiments, the object-side end face of the barrel has a bearing groove 10. The bearing groove 10 communicates with the outer peripheral surface of the barrel. A part of the auxiliary barrel extends into the bearing groove 10, and the auxiliary barrel and the barrel can be connected by glue.

[0088] In some alternative embodiments, the inner diameter d0bs of the object-side end face of the auxiliary barrel and the maximum effective radius DT11 of the object-side face of the first lens satisfy: 1.96 < d0bs / DT11 < 2.04. If d0bs / DT11 is less than 1.96, the inner diameter of the object-side end face of the auxiliary barrel is too small and the maximum effective radius of the object-side face of the first lens is too large, and the auxiliary barrel is likely to block the maximum effective radius of the object-side face of the first lens, resulting in the blocking of imaging rays that can pass through the maximum effective radius position of the object-side face of the first lens and affecting the imaging quality. If d0bs / DT11 is greater than 2.04, the inner diameter of the object-side end face of the auxiliary barrel is too large and the maximum effective radius of the object-side face of the first lens is too small, which easily causes non-imaging rays to enter the optical lens and affects the imaging quality. By controlling the ratio of the inner diameter of the object-side end face of the auxiliary barrel to the maximum effective radius of the object-side face of the first lens, the amount of light entering through the auxiliary barrel can be adapted to the maximum effective radius of the object-side face of the first lens, thereby improving the imaging quality.

[0089] In addition, in another alternative embodiment of the present application, an optical lens is further provided. The optical lens includes a lens barrel, a lens group and a spacer element group assembled in the lens barrel. The lens group sequentially includes a first lens with a positive focal power, a second lens with a positive focal power, a third lens with a negative focal power, and a fourth lens with a positive focal power along the optical axis from the object side to the image side; the spacer element group includes at least a first spacer element, and the first spacer element is located between the first lens and the second lens and is at least partially in contact with the image side surface of the first lens; the following relationships are satisfied between the lens barrel height L and the effective focal length f of the optical lens: 0.27 < L / f < 0.30; the following relationship is satisfied between the refractive index N1 of the first lens and the effective focal length f1 of the first lens: 17.22 mm < N1×f1 < 18.96 mm; the following relationship is satisfied between the central thickness CT1 of the first lens, the air gap T12 between the first lens and the second lens on the optical axis, and the interval distance EP01 between the object side end surface of the lens barrel and the object side surface of the first spacer element along the optical axis extension direction: 1.29 < (CT1 + T12) / EP01 < 1.72; the following relationship is satisfied between the effective focal length f1 of the first lens, the inner diameter d0s of the object side end surface of the lens barrel, and the inner diameter d1s of the object side surface of the first spacer element: 5.65 < f1 / (d0s - d1s) < 7.65.

[0090] The optical lens of the present application is composed of a lens barrel, four lenses and at least one spacer element. When the following relationships are satisfied between the lens barrel height L and the effective focal length f of the optical lens: 0.27 < L / f < 0.30; and the following relationship is satisfied between the refractive index N1 of the first lens and the effective focal length f1 of the first lens: 17.22 mm < N1×f1 < 18.96 mm, by restricting the focal length of the first lens and the optical lens and the lens barrel height, the convergence degree of light when passing through the first lens is optimized, so that the light converges reasonably in the subsequent space to achieve telephoto imaging. However, the aperture of the telephoto lens is relatively small, resulting in relatively concentrated stress on the edge of the first lens. In order to improve the convergence degree of light when passing through the first lens, the first lens can be made of glass material. However, the glass material has low toughness, resulting in a risk of cracking at the edge of the first lens during the reliability test, making the optical lens unable to meet the reliability requirements. By restricting (CT1 + T12) / EP01 and f1 / (d0s - d1s) within a reasonable range, the edge thickness and central thickness of the first lens can be ensured to be within a reasonable range, thereby ensuring the shape of the first lens, which is beneficial to improving the structural strength of the first lens, effectively reducing the risk of cracking of the first lens, and at the same time avoiding interference between the first lens and the second lens, which is beneficial to improving the structural stability, and further beneficial to improving the reliability of the optical lens. In addition, the deflection angle of light in the first lens can also be controlled to reduce the reflection of large-angle deflected light on the inner wall of the lens barrel or the first spacer element, which is beneficial to reducing the risk of stray light generated at the front end of the optical lens.

[0091] In addition, in another optional embodiment of the present application, an optical lens is further provided. The optical lens includes a lens barrel, a lens group and a spacer element group assembled in the lens barrel. The lens group sequentially includes a first lens with a positive optical power, a second lens with a positive optical power, a third lens with a negative optical power, and a fourth lens with a positive optical power along the optical axis from the object side to the image side; the spacer element group includes at least a first spacer element, and the first spacer element is located between the first lens and the second lens and at least partially contacts the image side surface of the first lens; the air gap T12 between the first lens and the second lens on the optical axis and the sum ∑AT of the air gaps between two adjacent lenses between the first lens and the fourth lens satisfy: 0.05 < T12 / ∑AT < 0.17, and the radius of curvature R2 of the image side surface of the first lens and the radius of curvature R3 of the object side surface of the second lens satisfy: -25.55 < R3 / R2 < 29.93; the maximum thickness CP1 of the first spacer element in the optical axis extension direction and the air gap T12 between the first lens and the second lens on the optical axis satisfy: 5.45 < (CP1 + EP12) / T12 < 21.25.

[0092] By limiting T12 / ∑AT within a reasonable range, it can be ensured that after the light rays are converged by the first lens, they can quickly enter the second lens, which is beneficial to the rapid convergence of light rays and thus beneficial to meeting the requirements of telephoto performance. However, due to the small air gap between the first lens and the second lens on the optical axis, when the first lens is installed, it is easy to interfere with the second lens, which is not conducive to the installation of the first lens. By controlling the relationship between the radius of curvature of the image side surface of the first lens, the radius of curvature of the object side surface of the second lens, the maximum thickness of the first spacer element in the optical axis extension direction, and the air gap between the first lens and the second lens on the optical axis, it is beneficial to control the edge gap between the first lens and the second lens. When the first lens is installed, the first spacer element abuts against the first lens first, avoiding interference with the second lens during the installation of the first lens and improving the convenience of assembling the first lens.

[0093] Of course, other parametric formulas in the above embodiments may also be included in this embodiment, which will not be elaborated here one by one.

[0094] Optionally, the above optical lens may further include a protective glass for protecting the photosensitive element located on the imaging surface.

[0095] The optical lens in the present application may use multiple lenses, such as the four 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.

[0096] 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 four lenses are described as an example in the embodiments, the optical lens is not limited to including four lenses. If necessary, the optical lens may also include other numbers of lenses.

[0097] Figure 1 A schematic diagram of dimension marking of an optical lens of an optional embodiment of the present application is shown. Figure 2 The following is a schematic diagram illustrating the dimensions of an optical lens according to another optional embodiment of the present application. Figure 1 Parameters such as d1s, d1m, D1s, D1m, d1bm, D1bm, d2s, d2m, d3s, d3m, d0s, D0s, d0bs, EP01, CP1, EP12, L, Lb, etc. are indicated in the figure. Figure 2 Parameters such as SAG11 and ET1 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 describing the specific embodiments later.

[0098] 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.

[0099] It should be noted that in the following embodiment 1, there are three examples of embodiment 1-1, embodiment 1-2, and embodiment 1-3; in embodiment 2, there are three examples of embodiment 2-1, embodiment 2-2, and embodiment 2-3; and in embodiment 3, there are three examples of embodiment 3-1, embodiment 3-2, and embodiment 2-3. In the three examples of the same embodiment, the parameters such as the radius of curvature, center thickness, and spacing distances between lenses 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, the second spacing element, and the third 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.

[0100] Embodiment 1

[0101] like Figures 3 to 8 As shown, the optical lens of embodiment 1 is described. Figure 3 The structure diagram of the optical lens of Example 1-1 is shown. Figure 4 The structure diagram of the optical lens of Example 1-2 is shown. Figure 5 The schematic diagrams of the structures of the optical lenses of Examples 1-3 are shown.

[0102] like Figures 3 to 5 As shown, the optical lens includes an auxiliary lens barrel P0b, a lens barrel P0, four lenses and multiple spacer elements. The lens barrel P0 includes a pressure ring 20, a first lens E1, a first spacer element P1, a first auxiliary spacer element P1b, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3 and a fourth lens E4 arranged in sequence from the object side to the image side.

[0103] like Figure 2 As shown, it is the structural schematic diagram of the optical lens of embodiment 1-1. In this example, the image side surface of the pressing ring 20 partially abuts against the object side surface S1 of the first lens, 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 of the first spacing element P1 partially abuts against the image side surface S2 of the first lens, and the object side surface and image side surface of the first auxiliary spacing element P1b partially abut against the image side surface S3 of the first spacing element P1 and the object side surface S4 of the second lens and the object side surface S5 of the third lens respectively. The object side surface and image side surface of the third spacing element P3 partially abut against the image side surface S6 of the third lens and the object side surface S7 of the fourth lens respectively. The image side surface S8 of the fourth lens partially abuts against the bearing surface of the lens barrel P0. The end face of the lens barrel P0 closest to the object has a bearing groove 10, and a part of the auxiliary lens barrel P0b extends into the bearing groove 10 and abuts against the lens barrel P0, and the two are connected by glue.

[0104] like Figure 3 As shown in FIG. 1 , it is a schematic diagram of the structure of the optical lens of Example 1-2. Figure 4 , which is a schematic diagram of the structure of the optical lens of Example 1-3. In Example 1-2 and Example 1-3, the abutment manner of each spacing element is similar to that of Example 1-1, and the relevant description in Example 1-1 may be referred to, and will not be repeated here.

[0105] In summary, the structural parameters of the optical lens of Example 1 in Example 1-1, Example 1-2, and Example 1-3 are shown in Table 2. (Unit: mm)

[0106] Table 2

[0107]

[0108] In Embodiment 1, the first lens has positive focal power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is convex. The second lens has positive focal power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens has negative focal power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is concave; the fourth lens has positive focal power, the object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is convex. S9 to S12 in Table 3 below can be the surface of a filter or a protective glass, which is not specifically limited here, and S13 is an imaging surface. S9 to S13 are not shown in the figure.

[0109] 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.

[0110] Table 3

[0111]

[0112] In the first embodiment, the object side surface and the image side surface of the second lens E2 to the fourth lens E4 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:

[0113] Formula (1)

[0114] Wherein, 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 radius of curvature R in Table 1 above; k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspherical surface. Table 4 below gives the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for each aspherical mirror surface S3-S8 in Example 1.

[0115] Table 4

[0116]

[0117] Figure 6 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 7 The astigmatism curve of the optical lens of Example 1 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 8 The distortion curve of the optical lens of the first embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles.

[0118] according to Figures 6 to 8 It can be seen that the optical lens provided in the first embodiment can achieve good imaging quality.

[0119] Embodiment 2

[0120] like Figures 9 to 14 As shown, the optical lens of the second embodiment is described. Fig. 9 The structure diagram of the optical lens of Example 2-1 is shown. Fig.10 FIG. 2 shows a schematic structural diagram of an optical lens of Example 2-2. Fig.11 A schematic structural diagram of the optical lens of Example 2-3 is shown.

[0121] like Figures 9 to 14 As shown, the optical lens includes an auxiliary lens barrel P0b, a lens barrel P0, four lenses and multiple spacer elements. The lens barrel P0 includes a pressure ring 20, a first lens E1, a first spacer element P1, a first auxiliary spacer element P1b, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3 and a fourth lens E4 arranged in sequence from the object side to the image side.

[0122] like Fig. 9 As shown, it is the structural schematic diagram of the optical lens of embodiment 2-1. In this example, the image side surface of the pressing ring 20 partially abuts against the object side surface S1 of the first lens, 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 of the first spacing element P1 partially abuts against the image side surface S2 of the first lens, and the object side surface and image side surface of the first auxiliary spacing element P1b partially abut against the image side surface S3 of the first spacing element P1 and the object side surface S3 of the second lens, respectively. The object side surface and image side surface of the second spacing element P2 partially abut against the image side surface S4 of the second lens and the object side surface S5 of the third lens, respectively. The object side surface and image side surface of the third spacing element P3 partially abut against the image side surface S6 of the third lens and the object side surface S7 of the fourth lens, respectively. The image side surface S8 of the fourth lens partially abuts against the bearing surface of the lens barrel P0. The end face of the lens barrel P0 closest to the object has a bearing groove 10, and a part of the auxiliary lens barrel P0b extends into the bearing groove 10 and abuts against the lens barrel P0, and the two are connected by glue.

[0123] like Fig.10 , which is a schematic diagram of the structure of the optical lens of Example 2-2. In Example 2-2, the supporting and abutting manner of each spacing element is similar to that of Example 2-1, and the relevant description in Example 2-1 may be referred to, and will not be repeated here.

[0124] like Fig.11, which is a schematic diagram of the structure of the optical lens of Example 2-3. In Example 2-3, the spacer element group further includes a second auxiliary spacer element P1c, which is located between the first auxiliary spacer element P1b and the second lens E2, and the object side surface and image side surface of the second auxiliary spacer element P1c are respectively abutted with the image side surface of the first auxiliary spacer element P1b and the object side surface S3 of the second lens. The abutment manner of other spacer elements is similar to that of Example 2-1, and the relevant description in Example 2-1 may be referred to, and no further description is given here.

[0125] In summary, the structural parameters of the optical lens of Example 2 in Example 2-1, Example 2-2, and Example 2-3 are shown in Table 5. (Unit: mm)

[0126] Table 5

[0127]

[0128] In the second embodiment, the first lens has positive power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens has positive power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens has negative power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is concave; the fourth lens has positive power, the object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is convex.

[0129] 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.

[0130] Table 6

[0131]

[0132] Table 7 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 2, wherein each aspherical surface shape can be defined by formula (1) given in the above Example 1. In this embodiment, the object side surface and image side surface of the first lens to the fourth lens are all aspherical surfaces.

[0133] Table 7

[0134]

[0135] Fig.12 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.13 The astigmatism curve of the optical lens of Example 2 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.14The distortion curve of the optical lens of the second embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles.

[0136] according to Figure 12 to Figure 14 It can be seen that the optical lens provided in the second embodiment can achieve good imaging quality.

[0137] Embodiment 3

[0138] like Figures 15 to 20 As shown, the optical lens of embodiment 3 is described. Fig.15 The structure diagram of the optical lens of Example 3-1 is shown. Fig.16 FIG. 3 is a schematic diagram showing the structure of the optical lens of Example 3-2. Fig.17 A schematic structural diagram of the optical lens of Example 3-3 is shown.

[0139] like Figures 15 to 17 As shown, the optical lens includes an auxiliary lens barrel P0b, a lens barrel P0, four lenses and multiple spacer elements. The lens barrel P0 includes a pressure ring 20, a first lens E1, a first spacer element P1, a first auxiliary spacer element P1b, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3 and a fourth lens E4 arranged in sequence from the object side to the image side.

[0140] like Fig.15 As shown, it is the structural schematic diagram of the optical lens of embodiment 3-1. In this example, the image side surface of the pressing ring 20 partially abuts against the object side surface S1 of the first lens, 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 of the first spacing element P1 partially abuts against the image side surface S2 of the first lens, and the object side surface and image side surface of the first auxiliary spacing element P1b partially abut against the image side surface S3 of the first spacing element P1 and the object side surface S4 of the second lens and the object side surface S5 of the third lens, respectively. The object side surface and image side surface of the third spacing element P3 partially abut against the image side surface S6 of the third lens and the object side surface S7 of the fourth lens, respectively. The image side surface S8 of the fourth lens partially abuts against the bearing surface of the lens barrel P0. The end face of the lens barrel P0 closest to the object has a bearing groove 10, and a part of the auxiliary lens barrel P0b extends into the bearing groove 10 and abuts against the lens barrel P0, and the two are connected by glue.

[0141] like Fig.16, which is a schematic diagram of the structure of the optical lens of Example 3-2. In Example 3-2, the spacer element group further includes a second auxiliary spacer element P1c, which is located between the first auxiliary spacer element P1b and the second lens E2, and the object side surface and image side surface of the second auxiliary spacer element P1c are respectively abutted with the image side surface of the first auxiliary spacer element P1b and the object side surface S3 of the second lens. The abutment manner of other spacer elements is similar to that of Example 3-1, and the relevant description in Example 3-1 may be referred to, and no further description is given here.

[0142] like Fig.11 As shown, it is a schematic diagram of the structure of the optical lens of Example 3-3. In Example 3-3, the supporting and abutting manner of each spacing element is similar to that of Example 3-1. Please refer to the relevant description in Example 3-1 and no further details will be given here.

[0143] In summary, the structural parameters of the optical lens of Example 3 in Example 3-1, Example 3-2, and Example 3-3 are shown in Table 8. (Unit: mm)

[0144] Table 8

[0145]

[0146] In the third embodiment, the first lens has positive power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is a plane. The second lens has positive power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens has negative power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is concave; the fourth lens has positive power, the object side surface S7 of the fourth lens is concave, and the image side surface S8 of the fourth lens is convex.

[0147] 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.

[0148] Table 9

[0149]

[0150] Table 10 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 3, wherein each aspherical surface shape can be defined by formula (1) given in the above Example 1. In this embodiment, the object side surface and image side surface of the first lens to the fourth lens are all aspherical surfaces.

[0151] Table 10

[0152]

[0153] Fig.18The 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.19 The astigmatism curve of the optical lens of Example 3 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig. 20 The distortion curve of the optical lens of the third embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles.

[0154] according to Figures 18 to 20 It can be seen that the optical lens provided in the third embodiment can achieve good imaging quality.

[0155] In summary, the optical lenses of Embodiments 1 to 3 respectively satisfy the relationship shown in Table 11.

[0156] Table 11

[0157]

[0158] Table 12 shows the effective focal length of each lens of the optical lens of Examples 1 to 3 (unit: mm).

[0159] Table 12

[0160]

[0161] 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.

[0162] 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.

[0163] 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.

[0164] 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.

[0165] 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 and a lens group and a spacer element group assembled in the lens barrel. The lens group includes a first lens, a second lens, a third lens and a fourth lens in sequence from the object side to the image side along the optical axis; The spacer element group includes at least a first spacer element, the first spacer element is located between the first lens and the second lens and is in at least partial contact with the image side surface of the first lens; The height L of the lens barrel and the effective focal length f of the optical lens satisfy the following conditions: 0.27 <L / f<0.30; The refractive index N1 of the first lens and the effective focal length f1 of the first lens satisfy: 17.22 mm <N1×f1<18.96mm; The distance EP01 between the object side end face of the lens barrel and the object side face of the first spacing element along the optical axis extension direction and the edge thickness ET1 of the non-effective diameter area of ​​the first lens satisfy: 1.69 <EP01 / ET1<2.66; The inner diameter d0s of the object side end surface of the lens barrel and the inner diameter d1s of the object side surface of the first spacing element satisfy: 1.18 <d0s / d1s<1.25。 2. The optical lens according to claim 1, characterized in that: The on-axis distance SAG11 between the intersection of the object side surface of the first lens and the optical axis to the vertex of the effective radius of the non-effective diameter area of ​​the object side surface of the first lens and the outer diameter D1s of the object side surface of the first spacer element satisfy: 0.09<|SAG11| / D1s <0.

12.

3. The optical lens according to claim 1, characterized in that: The center thickness CT1 of the first lens, the air gap T12 between the first lens and the second lens on the optical axis, and the spacing distance EP01 between the object side end face of the lens barrel and the object side face of the first spacing element along the extension direction of the optical axis satisfy the following: 1.29<(CT1+T12) / EP01<1.

72.

4. The optical lens according to claim 1, characterized in that: The curvature radius R1 of the object side surface of the first lens and the outer diameter D0s of the object side end surface of the lens barrel satisfy: 0.95 <R1 / D0s<1.19。 5. The optical lens according to claim 1, characterized in that: The outer diameter D1s of the object side surface of the first spacer element, the distance EP01 between the object side end surface of the lens barrel and the object side surface of the first spacer element along the optical axis extension direction, and the center thickness CT1 of the first lens satisfy: 8.96 mm <D1s / (EP01 / CT1)<10.89mm。 6. 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 and the sum ΣAT of the air gaps between two adjacent lenses from the first lens to the fourth lens satisfy the following: 0.05 <T12 / ∑AT<0.17。 7. The optical lens according to claim 1, characterized in that: The effective focal length f1 of the first lens, the inner diameter d0s of the object side end surface of the lens barrel and the inner diameter d1s of the object side surface of the first spacing element satisfy: 5.65 <f1 / (d0s-d1s)<7.65。 8. The optical lens according to any one of claims 1 to 7, characterized in that: The spacer element group further includes a first auxiliary spacer element, which is located between the first spacer element and the second lens and at least partially contacts the image side surface of the first spacer element, and the outer diameter D1bm of the image side surface of the first auxiliary spacer element and the inner diameter d1bm of the image side surface of the first auxiliary spacer element satisfy the following relationship: 1.12 <D1bm / d1bm<1.30。 9. The optical lens according to any one of claims 1 to 7, characterized in that: The spacer element group also includes a second spacer element, which is located between the second lens and the third lens, and the second spacer element is in contact with the image side portion of the second lens, and the maximum thickness CP1 of the first spacer element in the extension direction of the optical axis, the spacing distance EP12 between the image side surface of the first spacer element and the object side surface of the second spacer element along the extension direction of the optical axis, and the center thickness CT2 of the first lens satisfy the following: 1.38<(CP1+EP12) / CT2<1.

65.

10. The optical lens according to claim 9, characterized in that: A curvature radius R3 of the object-side surface of the second lens, a curvature radius R4 of the image-side surface of the second lens, and an inner diameter d2s of the object-side surface of the second spacer element satisfy the following relationship: 2.49<(R3+R4) / d2s<9.

56.

11. The optical lens according to claim 9, characterized in that: The combined focal length f12 of the first lens and the second lens, the maximum thickness CP1 of the first spacing element in the direction of extension of the optical axis, and the spacing distance EP12 between the image side surface of the first spacing element and the object side surface of the second spacing element in the direction of extension of the optical axis satisfy: 4.47 <f12 / (CP1+EP12)<5.49。 12. The optical lens according to any one of claims 1 to 7, characterized in that: The spacer element group further includes a second spacer element and a third spacer element, the second spacer element is located between the second lens and the third lens and contacts the image side surface of the second lens, the third spacer element is located between the third lens and the fourth lens and contacts the image side surface of the third lens, the minimum inner diameter of the first spacer element is greater than the minimum inner diameter of the second spacer element, and the minimum inner diameter of the second spacer element is greater than the minimum inner diameter of the third spacer element, The inner diameter d1s of the object side surface of the first spacing element and the inner diameter d2s of the object side surface of the second spacing element satisfy: 0.77 <d2s / d1s<0.84; The inner diameter d3s of the object side surface of the third spacing element and the inner diameter d2s of the object side surface of the second spacing element satisfy: 0.85 <d3s / d2s<0.89; The inner diameter d1m of the image side surface of the first spacing element and the inner diameter d2m of the image side surface of the second spacing element satisfy: 0.81 <d2m / d1m<0.90; The inner diameter d3m of the image side surface of the third spacing element and the inner diameter d2m of the image side surface of the second spacing element satisfy: 0.86 <d3m / d2m<0.89。 13. The optical lens according to any one of claims 1 to 7, characterized in that: The optical lens also includes an auxiliary lens barrel, which is located on the object side of the lens barrel, and is connected to the lens barrel. The height L of the lens barrel, the height Lb of the auxiliary lens barrel, the outer diameter D0bm of the image side end surface of the auxiliary lens barrel, and the inner diameter d0bs of the object side end surface of the auxiliary lens barrel satisfy the following conditions: 1.98 mm -1 <L / Lb / (D0bm-d0bs)<2.34mm -1 .

14. The optical lens according to claim 13, characterized in that: The inner diameter d0bs of the object side end surface of the auxiliary lens barrel and the maximum effective radius DT11 of the object side surface of the first lens satisfy the following relationship: 1.96 <d0bs / DT11<2.04。 15. The optical lens according to any one of claims 1 to 7, characterized in that: The first lens has positive optical power, the second lens has positive optical power, the third lens has negative optical power, and the fourth lens has positive optical power.

16. The optical lens according to any one of claims 1 to 7, characterized in that: The object side surface of the first lens is a convex surface; The object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; The object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; The image side surface of the fourth lens is a convex surface.

Images