Optical lens

Abstract

The invention provides an optical lens. The optical lens comprises a lens barrel, a lens group and a spacing assembly, wherein the lens group and the spacing assembly are accommodated in the lens barrel; the lens group comprises a first lens with negative focal power, a second lens with positive focal power, a third lens with positive focal power and a fourth lens with negative focal power which are sequentially arranged from the object side to the image side along the optical axis; the spacing assembly comprises a first spacing element which is arranged on the image side of the first lens and is in contact with the image side surface of the first lens; the second spacing element is arranged on the image side of the second lens and is in contact with the image side surface of the second lens; the third spacing element is arranged on the image side of the third lens and is in contact with the image side surface of the third lens; the optical lens satisfies the following conditions: 1.85 lt; l / (T12 + T23) lt; 2.75% of the total weight; 1.45 lt, 1.45 lt; (EP12 + CP1) / (EP2 + CP2) lt; 2.35, 2.35); and 2.05 lt; (d1s + d2s) / d3slt; and 2.25.

Description

Technical Field

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

[0002] With the rapid development of science and technology and the continuous improvement of people's demand for security, surveillance lenses have become an important part of the security industry and are driving the rapid progress of the entire industry. In recent years, the types of surveillance lenses have become increasingly diverse, among which fixed-focus lenses have taken a leading position in the field of security monitoring due to their many advantages such as high image quality, large aperture, and stable imaging quality.

[0003] However, the number of lenses in traditional fixed-focus lenses is often large, resulting in a large lens size and weight, which not only wastes manpower and material resources, but also causes inconvenience in use. Although there are some fixed-focus lenses with a four-lens structure on the market to reduce the size and weight of the lens, there are usually large air gaps between the lenses in these fixed-focus lenses when they are distributed, and the large air gaps will have a greater impact on the lens performance (such as the modulation transfer function MTF and field area), thereby affecting the imaging quality of the fixed-focus lens. Summary of the invention

[0004] One advantage of the present application is to provide an optical lens that can solve the adverse effect of a larger air gap in a traditional fixed-focus lens on lens performance.

[0005] On the one hand, the present application provides an optical lens, comprising a lens barrel, a lens group and a spacer assembly contained in the lens barrel; the lens group comprises: a first lens with negative optical power, a second lens with positive optical power, a third lens with positive optical power, and a fourth lens with negative optical power, which are arranged in sequence from the object side to the image side along the optical axis; the spacer assembly comprises a first spacer element disposed on the image side of the first lens and in contact with the image side surface of the first lens, a second spacer element disposed on the image side of the second lens and in contact with the image side surface of the second lens, and a third spacer element disposed on the image side of the third lens and in contact with the image side surface of the third lens; the optical lens satisfies:

[0006] 1.85 <L / (T12+T23)<2.75;

[0007] 1.45<(EP12+CP1) / (EP23+CP2)<2.35; and

[0008] 2.05<(d1s+d2s) / d3s<2.25;

[0009] Among them, L is the maximum height of the lens barrel; T12 is the air gap between the first lens and the second lens on the optical axis; T23 is the air gap between the second lens and the third lens on the optical axis; EP12 is the spacing distance between the first spacing element and the second spacing element along the optical axis; CP1 is the maximum thickness of the first spacing element; EP23 is the spacing distance between the second spacing element and the third spacing element along the optical axis; CP2 is the maximum thickness of the second spacing element; d1s is the object side inner diameter of the first spacing element; d2s is the object side inner diameter of the second spacing element; d3s is the object side inner diameter of the third spacing element.

[0010] In some embodiments of the present application, a spacer element with a maximum thickness between 3.80 mm and 4.83 mm is provided between the first lens and the second lens; the spacer assembly satisfies: 6.25 mm<∑CP1+∑CP2<8.15 mm; wherein ∑CP1 is the sum of the maximum thicknesses of all spacer elements between the first lens and the second lens; ∑CP2 is the sum of the maximum thicknesses of all spacer elements between the second lens and the third lens.

[0011] In some embodiments of the present application, the spacing assembly further includes a first auxiliary spacing element disposed on the image side of the first spacing element and in contact with the image side surface of the first spacing element, and a first auxiliary spacing element disposed on the image side of the first auxiliary spacing element and in contact with the image side surface of the first auxiliary spacing element; the difference between the object side inner diameter d1cs of the first auxiliary spacing element and the object side outer diameter D2m and the image side inner diameter d2m of the second spacing element satisfies:

[0012] 0.35 <d1cs / (D2m-d2m)<0.70。

[0013] In some embodiments of the present application, the object side outer diameter D2s of the second spacer element, the effective focal length f2 of the second lens, and the image side curvature radius R4 of the second lens satisfy:

[0014] -19.05mm <D2s / (f2 / R4)<-12.85mm。

[0015] In some embodiments of the present application, a distance EP01 from the object side end surface of the lens barrel to the object side surface of the first spacer element along the optical axis direction and a center thickness CT1 of the first lens satisfy:

[0016] 1.95 <EP01 / CT1<5.15。

[0017] In some embodiments of the present application, the object-side outer diameter D2s of the second spacer element, the object-side inner diameter d2s of the second spacer element, and the image-side inner diameter d1m of the first spacer element satisfy:

[0018] 1.05 < (D2s - d2s) / d1m < 1.80.

[0019] In some embodiments of the present application, the spacer assembly further includes a first auxiliary spacer element disposed on the image side of the first spacer element and in contact with the image side surface of the first spacer element, and a second auxiliary spacer element disposed on the image side of the second spacer element and in contact with the image side surface of the second spacer element; the optical lens satisfies:

[0020] 1.35 < T12 / (CT1 + CT2) < 1.85; and

[0021] 0.28 ≤ (CP1b + CP2b) / L ≤ 0.43;

[0022] wherein, T12 is the air gap between the first lens and the second lens on the optical axis; CT1 is the central thickness of the first lens; CT2 is the central thickness of the second lens; CP1b is the maximum thickness of the first auxiliary spacer element; CP2b is the maximum thickness of the second auxiliary spacer element.

[0023] In some embodiments of the present application, the object-side inner diameter d3s of the third spacer element, the effective focal length f3 of the third lens, and the object-side curvature radius R5 of the third lens satisfy:

[0024] 5.20 mm < d3s / (f3 / R5) < 7.0 mm.

[0025] In some embodiments of the present application, the spacer assembly further includes a first auxiliary spacer element disposed on the image side of the first spacer element and in contact with the image side surface of the first spacer element; the spacing distance EP12 between the first spacer element and the second spacer element in the optical axis direction and the maximum thickness CP1b of the first auxiliary spacer element satisfy:

[0026] 1.35 < EP12 / CP1b < 1.70.

[0027] In some embodiments of the present application, the object-side surface and the image-side surface of the first lens are a convex surface and a concave surface respectively; the object-side curvature radius R1 of the first lens, the image-side curvature radius R2 of the first lens, and the object-side inner diameter d1s of the first spacer element satisfy:

[0028] 1.20 < (R1 + R2) / d1s < 1.75.

[0029] In some embodiments of the present application, the object side and the image side of the second lens are both convex surfaces; the object side and the image side of the third lens are both convex surfaces; the object side and the image side of the fourth lens are a concave surface and a convex surface respectively; the optical lens satisfies:

[0030] 2.05mm < f / tan(Semi - FOV) < 3.75mm; and

[0031] 1.10 < L / D0m < 1.95;

[0032] wherein, f is the effective focal length of the optical lens; Semi - FOV is half of the maximum field of view angle of the optical lens; L is the maximum height of the lens barrel; D0m is the outer diameter of the image side of the lens barrel.

[0033] In some embodiments of the present application, the spacer assembly further includes a first auxiliary spacer element disposed on the image side of the first spacer element and in contact with the image side surface of the first spacer element, and a first secondary spacer element disposed on the image side of the first auxiliary spacer element and in contact with the image side surface of the first auxiliary spacer element; the outer diameter D1cm of the image side of the first secondary spacer element, the inner diameter d1cs of the object side of the first secondary spacer element, the outer diameter D2m of the image side of the second spacer element, and the inner diameter d2s of the object side of the second spacer element satisfy:

[0034] 0.95 < (D1cm - d1cs) / (D2m - d2s) < 1.20.

[0035] In some embodiments of the present application, the optical lens satisfies:

[0036] 1.01 ≤ EB34 / (CT3 + CT4) ≤ 1.10;

[0037] wherein, EB34 is the distance along the optical axis from the structure region of the third lens closest to the object side to the structure region of the fourth lens closest to the image side; CT3 is the central thickness of the third lens; CT4 is the central thickness of the fourth lens.

[0038] On the other hand, the present application provides an optical lens, which includes a lens barrel and a lens group and a spacer assembly accommodated within the lens barrel; the lens group includes, arranged in sequence from the object side to the image side along the optical axis: a first lens with a negative optical power, a second lens with a positive optical power, a third lens with a positive optical power, and a fourth lens with a negative optical power; the spacer assembly includes a first spacer element disposed on the image side of the first lens and in contact with the image side surface of the first lens, a second spacer element disposed on the image side of the second lens and in contact with the image side surface of the second lens, and a third spacer element disposed on the image side of the third lens and in contact with the image side surface of the third lens; the object side surface and the image side surface of the first lens are a convex surface and a concave surface respectively; the object side surface and the image side surface of the second lens are both convex surfaces; the object side surface and the image side surface of the third lens are both convex surfaces; the object side surface and the image side surface of the fourth lens are a concave surface and a convex surface respectively; the optical lens satisfies:

[0039] 1.85 < L / (T12 + T23) < 2.75;

[0040] -19.05 < D2s / (f2 / R4) < -12.85; and

[0041] -13.24 ≤ (f3 + f4) / (T34 + CP3) ≤ -8.76;

[0042] wherein, L is the maximum height of the lens barrel; T12 is the air gap between the first lens and the second lens on the optical axis; T23 is the air gap between the second lens and the third lens on the optical axis; D2s is the object side outer diameter of the second spacer element; f2 is the effective focal length of the second lens; R4 is the image side curvature radius of the second lens; f3 is the effective focal length of the third lens; f4 is the effective focal length of the fourth lens; T34 is the air gap between the third lens and the fourth lens on the optical axis; CP3 is the maximum thickness of the third spacer element.

[0043] In some embodiments of the present application, the optical lens satisfies:

[0044] 2.15 ≤ f34 / f ≤ 3.14; and

[0045] 3.25 < T34 / CP3 < 7.15;

[0046] wherein, f34 is the combined focal length of the third lens and the fourth lens; f is the effective focal length of the optical lens; T34 is the air gap between the third lens and the fourth lens on the optical axis; CP3 is the maximum thickness of the third spacer element.

[0047] In some embodiments of the present application, the distance EP01 along the optical axis from the object-side end face of the lens barrel to the object-side face of the first spacer element, the object-side inner diameter d0s of the lens barrel, and the object-side inner diameter d1s of the first spacer element satisfy:

[0048] 0.60 < EP01 / (d0s - d1s) < 1.0.

[0049] In some embodiments of the present application, the object-side inner diameter d0s of the lens barrel and the object-side outer diameter D3s of the third spacer element satisfy:

[0050] 0.85 < d0s / D3s < 1.60.

[0051] In summary, in the optical lens of the present application, the optical powers of the four lenses are distributed as negative-positive-positive-negative, and satisfy the relational expression 1.85 < L / (T12 + T23) < 2.75. It can be seen that the sum of the air gaps on the optical axis between the first lens and the second lens and the air gap on the optical axis between the second lens and the third lens occupies a relatively large space in the optical lens; and the air gap is highly sensitive to the peripheral field of view, which will have a greater impact on the field curvature of the outer peripheral field of view of the lens. Furthermore, the MTF field curvature shift will also cause the MTF peak to drop. Based on this, the present application indirectly controls the structural region thickness of the second lens and the third lens and the thickness of the spacer element by restricting the distance EP12 along the optical axis between the first spacer element and the second spacer element, the maximum thickness CP1 of the first spacer element, the distance EP23 along the optical axis between the second spacer element and the third spacer element, and the maximum thickness CP2 of the second spacer element, so as to increase the stability of the post-assembly support, reduce the influence of lens tilt or surface shape change and air gap fluctuation on the modulation transfer function MTF after assembly. At the same time, by reasonably setting the inner diameter of the spacer element, the field of view angle and light collection ability of the optical lens are also ensured, and the influence of the inner diameter of the spacer element on the marginal rays is reduced; that is to say, the optical lens of the present application effectively reduces the influence on the MTF peak and field curvature by restricting the edge thickness of the lens and the thickness and inner diameter of the spacer element. Description of the Drawings

[0052] Figure 1 is a schematic diagram of the structural parameters of an optical lens according to an embodiment of the present application;

[0053] Figure 2 is a schematic diagram of the structure of the optical lens according to Embodiment 1 of the present application;

[0054] Figure 3 is a schematic diagram of the structure of the optical lens according to Embodiment 2 of the present application;

[0055] Figure 4is a schematic structural diagram of an optical lens according to Embodiment 3 of the present application;

[0056] Figure 5A A schematic diagram of an axial chromatic aberration curve of the optical lens according to the first embodiment, the second embodiment and the third embodiment of the present application is shown;

[0057] Figure 5B Schematic diagrams of astigmatism curves of the optical lenses according to the first, second and third embodiments of the present application are shown;

[0058] Figure 6 is a schematic structural diagram of an optical lens according to Embodiment 4 of the present application;

[0059] Figure 7 is a schematic structural diagram of an optical lens according to Embodiment 5 of the present application;

[0060] Figure 8 is a schematic structural diagram of an optical lens according to Embodiment 6 of the present application;

[0061] Fig.9A A schematic diagram of an axial chromatic aberration curve of the optical lens according to the fourth embodiment, the fifth embodiment and the sixth embodiment of the present application is shown;

[0062] Fig. 9B Schematic diagrams of astigmatism curves of the optical lenses according to the fourth embodiment, the fifth embodiment, and the sixth embodiment of the present application are shown;

[0063] Fig.10 is a schematic structural diagram of an optical lens according to Embodiment 7 of the present application;

[0064] Fig.11 is a schematic structural diagram of an optical lens according to Embodiment 8 of the present application;

[0065] Fig.12 is a schematic structural diagram of an optical lens according to Embodiment 9 of the present application;

[0066] Fig.13A Schematic diagrams of axial chromatic aberration curves of the optical lenses according to the seventh embodiment, the eighth embodiment, and the ninth embodiment of the present application are shown;

[0067] Fig. 13B Schematic diagrams of astigmatism curves of the optical lenses according to the seventh embodiment, the eighth embodiment and the ninth embodiment of the present application are shown;

[0068] Fig.14 is a schematic structural diagram of an optical lens according to Embodiment 10 of the present application;

[0069] Fig.15is a schematic structural diagram of an optical lens according to the eleventh embodiment of the present application;

[0070] Fig.16 is a schematic structural diagram of an optical lens according to Embodiment 12 of the present application;

[0071] Fig.17A Schematic diagrams of axial chromatic aberration curves of the optical lenses according to the tenth embodiment, the eleventh embodiment, and the twelfth embodiment of the present application are shown;

[0072] Fig. 17B Schematic diagrams of astigmatism curves of the optical lenses according to the tenth embodiment, the eleventh embodiment, and the twelfth embodiment of the present application are shown;

[0073] Fig.18A and Fig.18B The MTF curve and modulation transfer function curve of the optical imaging lens are shown respectively when L / (T12+T23)=2.02, (EP12+CP1) / (EP23+CP2)=1.89 and (d1s+d2s) / d3s=2.16;

[0074] Fig.19A and Fig.19B The MTF curve and the modulation transfer function curve of the optical imaging lens are shown respectively when L / (T12+T23)=2.02, (EP12+CP1) / (EP23+CP2)=1.439 and (d1s+d2s) / d3s=2;

[0075] Fig. 20A and Fig. 20B The MTF curve and modulation transfer function curve of the optical imaging lens are respectively shown when L / (T12+T23)=2.02, (EP12+CP1) / (EP23+CP2)=2.43 and (d1s+d2s) / d3s=2.5. DETAILED DESCRIPTION

[0076] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0077] 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.

[0078] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. 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 only examples and are not drawn strictly to scale.

[0079] 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 type in the paraxial area can be judged according to the general method in this field, for example, the positive and negative R value (R refers to the radius of curvature of the paraxial area) is used to judge the concave and convex. In this article, the surface of each lens closest to the subject is called the object side of the lens, and the surface of each lens closest to the imaging surface is called the image side of the lens. 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.

[0080] It should also be understood that the terms "comprises", "including", "having", "includes" and / or "comprising", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0081] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0082] It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The following embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can also be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0083] According to one aspect of the present application, Figure 1 As shown, one embodiment of the present application proposes an optical lens, which may include a lens barrel and a lens group and a spacing assembly contained in the lens barrel; the lens group includes: a first lens with negative optical focal length, a second lens with positive optical focal length, a third lens with positive optical focal length, and a fourth lens with negative optical focal length, which are arranged in sequence from the object side to the image side along the optical axis; the spacing assembly includes a first spacing element disposed on the image side of the first lens and in contact with the image side surface of the first lens, a second spacing element disposed on the image side of the second lens and in contact with the image side surface of the second lens, and a third spacing element disposed on the image side of the third lens and in contact with the image side surface of the third lens.

[0084] In particular, the optical lens satisfies:

[0085] 1.85 <L / (T12+T23)<2.75;

[0086] 1.45<(EP12+CP1) / (EP23+CP2)<2.35; and

[0087] 2.05<(d1s+d2s) / d3s<2.25;

[0088] Among them, L is the maximum height of the lens barrel; T12 is the air gap between the first lens and the second lens on the optical axis; T23 is the air gap between the second lens and the third lens on the optical axis; EP12 is the spacing distance between the first spacing element and the second spacing element along the optical axis; CP1 is the maximum thickness of the first spacing element; EP23 is the spacing distance between the second spacing element and the third spacing element along the optical axis; CP2 is the maximum thickness of the second spacing element; d1s is the object side inner diameter of the first spacing element; d2s is the object side inner diameter of the second spacing element; d3s is the object side inner diameter of the third spacing element.

[0089] It should be noted that in the above embodiments of the present application, the optical powers of the four lenses in the optical lens are distributed as negative-positive-positive-negative, and satisfy the relational expression 1.85 < L / (T12 + T23) < 2.75. It can be seen that the sum of the air gaps on the optical axis between the first lens and the second lens and the air gaps on the optical axis between the second lens and the third lens occupies a relatively large space in the optical lens; and the air gap is more sensitive to the peripheral field of view, which will have a greater impact on the field curvature of the outer peripheral field of view of the lens. Furthermore, the MTF field curvature shift will also cause the MTF peak to drop. Based on this, the present application indirectly controls the thickness of the structural regions of the second lens and the third lens and the thickness of the spacer elements by restricting the axial spacing distance EP12 between the first spacer element and the second spacer element, the maximum thickness CP1 of the first spacer element, the axial spacing distance EP23 between the second spacer element and the third spacer element, and the maximum thickness CP2 of the second spacer element, so as to increase the stability of the bearing after assembly, reduce the influence of lens tilt or surface shape change and air gap fluctuation on the modulation transfer function MTF after assembly. At the same time, by reasonably setting the inner diameter of the spacer element, the field of view angle and light collection ability of the optical lens are also ensured, and the influence of the inner diameter of the spacer element on the marginal rays is reduced; that is to say, the optical lens of the present application effectively reduces the influence on the MTF peak and field curvature by restricting the edge thickness of the lens and the thickness and inner diameter of the spacer element. It can be understood that the maximum thickness mentioned in the present application refers to the distance along the optical axis from the surface closest to the object side to the surface closest to the image side on the spacer element; the structural region mentioned in the present application refers to the non-effective diameter region around the effective diameter region of the lens.

[0090] In addition, the object side surface and the image side surface of the first lens are a convex surface and a concave surface respectively; the object side surface and the image side surface of the second lens are both convex surfaces; the object side surface and the image side surface of the third lens are both convex surfaces; the object side surface and the image side surface of the fourth lens are a concave surface and a convex surface respectively.

[0091] Exemplarily, Fig.18A and Fig.18B respectively show the MTF curve and the modulation transfer function curve of the optical lens when L / (T12 + T23) = 2.02; (EP12 + CP1) / (EP23 + CP2) = 1.89; (d1s + d2s) / d3s = 2.16; Fig.19A and Fig.19B respectively show the MTF curve and the modulation transfer function curve of the optical lens when L / (T12 + T23) = 2.02; (EP12 + CP1) / (EP23 + CP2) = 1.439; (d1s + d2s) / d3s = 2; Fig. 20A and Fig. 20BThe MTF curve and modulation transfer function curve of the optical lens are shown respectively when L / (T12+T23)=2.02; (EP12+CP1) / (EP23+CP2)=2.43; (d1s+d2s) / d3s=2.5. It is easy to see from the figure: Fig.18A and Fig.18B As shown in FIG. 1 , when the relationship (EP12+CP1) / (EP23+CP2) is greater than 1.45 and less than 2.35, and the relationship (d1s+d2s) / d3s is greater than 2.05 and less than 2.25, the air spacing of the optical lens has little effect on the field curvature, so that the optical lens has good MTF performance; Fig.19A and Fig.19B As shown in FIG. 1 , when the relationship (EP12+CP1) / (EP23+CP2) is less than 1.45 and the relationship (d1s+d2s) / d3s is less than 2.05, an obvious positive field region will appear in the optical lens, causing the MTF performance of the optical lens to slightly decrease and fail to meet the imaging requirements; Fig. 20A and Fig. 20B As shown, when the relationship (EP12+CP1) / (EP23+CP2) is greater than 2.35 and the relationship (d1s+d2s) / d3s is greater than 2.25, the air spacing of the optical lens is obviously poor, resulting in a serious degradation of the MTF performance of the optical lens and failing to meet the imaging requirements.

[0092] Preferably, the optical lens satisfies: 1.88≤L / (T12+T23)≤2.70; 1.47≤(EP12+CP1) / (EP23+CP2)≤2.31; and 2.08≤(d1s+d2s) / d3s≤2.23.

[0093] According to some embodiments of the present application, a spacer element with a maximum thickness between 3.80 mm and 4.83 mm is provided between the first lens and the second lens; the spacer assembly satisfies: 6.25 mm<∑CP1+∑CP2<8.15 mm; wherein ∑CP1 is the sum of the maximum thicknesses of all spacer elements between the first lens and the second lens; ∑CP2 is the sum of the maximum thicknesses of all spacer elements between the second lens and the third lens.

[0094] In this way, the optical lens of the present application not only provides better support for the lens by arranging a thicker spacer element between the first lens and the second lens, thereby improving the stability of the lens assembly and the durability of the lens, but also controls the spacing between the first lens, the second lens and the third lens through the relationship 6.25mm<∑CP1+∑CP2<8.15mm, so as to reduce the size of the lens and ensure the compactness of the lens structure.

[0095] Preferably, a spacer element with a maximum thickness between 3.817 mm and 4.808 mm is provided between the first lens and the second lens; the spacer assembly satisfies: 6.27 mm ≤ ∑CP1 + ∑CP2 ≤ 8.11 mm.

[0096] According to some embodiments of the present application, the spacer assembly further includes a first auxiliary spacer element disposed on the image side of the first spacer element and in contact with the image side surface of the first spacer element, and a first secondary spacer element disposed on the image side of the first auxiliary spacer element and in contact with the image side surface of the first auxiliary spacer element; the object-side inner diameter d1cs of the first secondary spacer element, the image-side outer diameter D2m of the second spacer element, and the image-side inner diameter d2m of the second spacer element satisfy: 0.35 < d1cs / (D2m - d2m) < 0.70.

[0097] In this way, since d1cs is the minimum aperture through which light is allowed to pass through the object-side surface of the second lens, which determines the range of light that the lens can capture, and thus affects the field of view and brightness of the imaging, while d2m is the minimum aperture through which light is allowed to pass through the image-side surface of the second lens, which is used to optimize light control, reduce stray light or achieve specific optical effects; therefore, through the constraint of the above relationship 0.35 < d1cs / (D2m - d2m) < 0.70, the optical lens of the present application can make the lens design pay more attention to maintaining a large light-transmitting aperture on the front surface to maximize the light collection ability, and at the same time reduce unnecessary stray light or achieve specific beam constraints by reducing the rear aperture.

[0098] Preferably, the object-side inner diameter d1cs of the first secondary spacer element, the image-side outer diameter D2m of the second spacer element, and the image-side inner diameter d2m of the second spacer element satisfy: 0.38 ≤ d1cs / (D2m - d2m) ≤ 0.66.

[0099] According to some embodiments of the present application, the outer diameter D2s of the second spacer element P, the effective focal length f2 of the second lens, and the image-side curvature radius R4 of the second lens satisfy: -19.05 mm < D2s / (f2 / R4) < -12.85 mm.

[0100] In this way, the optical lens of the present application constrains the focal length and curvature radius of the second lens through the above relationship -19.05 mm < D2s / (f2 / R4) < -12.85 mm to provide sufficient positive refractive power, which is convenient for ensuring the compactness and compatibility of the entire system, and thus ensuring the magnification effect of the entire lens on light or images under specific conditions.

[0101] Preferably, the outer diameter D2s of the second spacer element, the effective focal length f2 of the second lens, and the image side curvature radius R4 of the second lens satisfy: -19.04mm≤D2s / (f2 / R4)≤-12.86mm. More preferably, the outer diameter D2s of the second spacer element, the effective focal length f2 of the second lens, and the image side curvature radius R4 of the second lens satisfy: -15.75mm <D2s / (f2 / R4)<-12.85mm。

[0102] According to some embodiments of the present application, the distance EP01 from the object side end surface of the lens barrel to the object side surface of the first spacing element along the optical axis direction and the center thickness CT1 of the first lens meet the following conditions: 1.95 <EP01 / CT1<5.15。

[0103] In this way, the optical lens of the present application can ensure that the edge thickness of the first lens and the wall thickness of the front end of the lens reduce performance fluctuations caused by mechanical shock or temperature changes by controlling the ratio of the distance EP01 from the object side end face of the lens barrel to the object side face of the first spacing element along the optical axis and the center thickness CT1 of the first lens, thereby improving the reliability and durability of the optical lens.

[0104] Preferably, a distance EP01 from the object-side end surface of the lens barrel to the object-side surface of the first spacer element along the optical axis direction and a center thickness CT1 of the first lens satisfy: 1.97≤EP01 / CT1≤5.12.

[0105] According to some embodiments of the present application, the object side outer diameter D2s of the second spacer element, the object side inner diameter d2s of the second spacer element, and the image side inner diameter d1m of the first spacer element satisfy: 1.05<(D2s-d2s) / d1m<1.80.

[0106] In this way, since the difference between the inner and outer diameters of the object side of the second spacer element represents the portion of the lens edge that exceeds the second surface light aperture, reflecting the additional edge width of the lens designed for installation and protection, the present application ensures that the second lens does not block too much light transmitted by the first lens when installed by constraining the above relationship 1.05<(D2s-d2s) / d1m<1.80.

[0107] Preferably, an object-side outer diameter D2s of the second spacer element, an object-side inner diameter d2s of the second spacer element, and an image-side inner diameter d1m of the first spacer element satisfy: 1.10≤(D2s-d2s) / d1m≤1.78.

[0108] According to some embodiments of the present application, the spacer assembly further includes a first auxiliary spacer element disposed on the image side of the first spacer element and in contact with the image side surface of the first spacer element, and a second auxiliary spacer element disposed on the image side of the second spacer element and in contact with the image side surface of the second spacer element; the optical lens satisfies: 1.35 < T12 / (CT1 + CT2) < 1.85; and 0.28 ≤ (CP1b + CP2b) / L ≤ 0.43; wherein, T12 is the air gap between the first lens and the second lens on the optical axis; CT1 is the central thickness of the first lens; CT2 is the central thickness of the second lens; CP1b is the maximum thickness of the first auxiliary spacer element; CP2b is the maximum thickness of the second auxiliary spacer element.

[0109] In this way, the optical lens of the present application precisely controls the air gap between the first lens and the second lens within a reasonable range by setting the proportional relationship between the air gap T12 between the first lens and the second lens on the optical axis, the central thickness CT1 of the first lens, and the central thickness CT2 of the second lens, so as to ensure the smooth transition of light between the lenses, reduce the scattering and loss of light, thereby improving the imaging quality of the lens; at the same time, the optical lens of the present application also disperses the stress inside the lens during assembly by reasonably designing the size and shape of the auxiliary spacer element and combining the corresponding air gap and lens central thickness, reduces the lens deformation caused by vibration or temperature change, and ensures that the lens can maintain stable performance in various environments.

[0110] Preferably, the optical lens satisfies: 1.38 ≤ T12 / (CT1 + CT2) ≤ 1.80; and 0.28 ≤ (CP1b + CP2b) / L ≤ 0.43.

[0111] According to some embodiments of the present application, the object-side inner diameter d3s of the third spacer element, the effective focal length f3 of the third lens, and the object-side curvature radius R5 of the third lens satisfy: 5.20 mm < d3s / (f3 / R5) < 7.0 mm.

[0112] In this way, the optical lens of the present application can control the focusing or diverging characteristics of the lens on light by controlling the relational expression 5.20 mm < d3s / (f3 / R5) < 7.0 mm; at the same time, since the effective clear aperture of the lens determines the amount of light that the lens can receive and pass through, the present application determines the light passing efficiency of the lens by controlling the relational expression 5.20 mm < d3s / (f3 / R5) < 7.0 mm, so that the relative illumination of the lens meets the requirements, in order to control the night vision performance of the lens.

[0113] Preferably, the object-side inner diameter d3s of the third spacing element, the effective focal length f3 of the third lens, and the object-side curvature radius R5 of the third lens satisfy: 5.24 mm≤d3s / (f3 / R5)≤6.95 mm.

[0114] According to some embodiments of the present application, the spacer assembly further includes a first auxiliary spacer element disposed on the image side of the first spacer element and in contact with the image side surface of the first spacer element; the spacing distance EP12 between the first spacer element and the second spacer element along the optical axis and the maximum thickness CP1b of the first auxiliary spacer element satisfy: 1.35 <EP12 / CP1b<1.70。

[0115] In this way, the optical lens of the present application helps to ensure a smooth transition and tight fit between the first spacer element and the second spacer element by introducing the first auxiliary spacer element and precisely controlling its maximum thickness, which not only improves the overall structural stability of the lens, but also reduces light scattering and performance degradation caused by loose optical elements or excessive intermittence.

[0116] Preferably, a spacing distance EP12 between the first spacing element and the second spacing element along the optical axis direction and a maximum thickness CP1b of the first auxiliary spacing element satisfy: 1.37≤EP12 / CP1b≤1.69.

[0117] According to some embodiments of the present application, the object-side surface and the image-side surface of the first lens are convex and concave, respectively; the object-side curvature radius R1 of the first lens, the image-side curvature radius of the first lens, and the object-side inner diameter d1s of the first spacer element satisfy: 1.20<(R1+R2) / d1s<1.75.

[0118] Thus, the optical lens of the present application can ensure that the first lens has a good light focusing effect and a strong refractive power through the relationship 1.20<(R1+R2) / d1s<1.75; and the object side inner diameter d1s of the first spacing element limits the amount of light passing through. In other words, the optical lens of the present application can ensure that the focal length, aberration correction and relative illumination of the lens are balanced through the control of the relationship 1.20<(R1+R2) / d1s<1.75.

[0119] Preferably, the object-side curvature radius R1 of the first lens, the image-side curvature radius of the first lens, and the object-side inner diameter d1s of the first spacer element satisfy: 1.24≤(R1+R2) / d1s≤1.72.

[0120] According to some embodiments of the present application, the object side and the image side of the second lens are both convex surfaces; the object side and the image side of the third lens are both convex surfaces; the object side and the image side of the fourth lens are concave and convex surfaces respectively; the optical lens satisfies: 2.05 mm < f / tan(Semi-FOV) < 3.75 mm; and 1.10 < L / D0m < 1.95; where f is the effective focal length of the optical lens; Semi-FOV is half of the maximum field of view angle of the optical lens; L is the maximum height of the lens barrel; and D0m is the outer diameter of the image side of the lens barrel.

[0121] In this way, by controlling the relationship 2.05 mm < f / tan(Semi-FOV) < 3.75 mm, the optical lens of the present application determines that the usage scenario of the lens is for close-range scene monitoring, making the monitoring of the nearby scene clearer and ensuring that objects to be monitored such as human faces within the monitoring range can be better presented; at the same time, combined with the control of the overall size of the lens by the relationship 1.10 < L / D0m < 1.95, the overall lens is made more compact, thereby reducing the size of the entire surveillance camera and facilitating the installation and concealment requirements of the camera.

[0122] Preferably, the optical lens satisfies: 2.10 mm ≤ f / tan(Semi-FOV) ≤ 3.71 mm; and 1.12 ≤ L / D0m ≤ 1.92.

[0123] According to some embodiments of the present application, the spacer assembly further includes a first auxiliary spacer element disposed on the image side of the first spacer element and in contact with the image side surface of the first spacer element, and a first secondary spacer element disposed on the image side of the first auxiliary spacer element and in contact with the image side surface of the first auxiliary spacer element; the outer diameter D1cm of the image side of the first secondary spacer element, the inner diameter d1cs of the object side of the first secondary spacer element, the outer diameter D2m of the image side of the second spacer element, and the inner diameter d2s of the object side of the second spacer element satisfy: 0.95 < (D1cm - d1cs) / (D2m - d2s) < 1.20.

[0124] In this way, by controlling the inner and outer diameter dimensions between the first secondary spacer element and the second spacer element, the optical lens of the present application can ensure the effective light-blocking area of the first secondary spacer element and the second spacer element, and reasonably setting the effective light-blocking area of the first secondary spacer element and the effective light-blocking area of the second lens can effectively block the excess light refracted by the first lens and the second lens without affecting the effective light.

[0125] Preferably, the image side outer diameter D1cm of the first auxiliary spacer element, the object side inner diameter d1cs of the first auxiliary spacer element, the image side outer diameter D2m of the second spacer element and the object side inner diameter d2s of the second spacer element satisfy: 0.98≤(D1cm-d1cs) / (D2m-d2s)≤1.18.

[0126] According to some embodiments of the present application, the optical lens satisfies: 1.01≤EB34 / (CT3+CT4)≤1.10; wherein EB34 is the distance along the optical axis from the structural area of ​​the third lens closest to the object side to the structural area of ​​the fourth lens closest to the image side; CT3 is the center thickness of the third lens; and CT4 is the center thickness of the fourth lens.

[0127] In this way, the optical lens of the present application can optimize the focal length and imaging distance of the lens system by precisely controlling the structural relationship between the third lens and the fourth lens, which helps to obtain clear images at different shooting distances and improve the adaptability and flexibility of the lens system; at the same time, it can also enhance the assembly stability of the lens and reduce the fluctuation of the lens gap after mechanical impact.

[0128] It is worth mentioning that according to another aspect of the present application, another embodiment of the present application provides an optical lens, which may include a lens barrel and a lens group and a spacing component contained in the lens barrel; the lens group includes: a first lens with negative optical power, a second lens with positive optical power, a third lens with positive optical power, and a fourth lens with negative optical power arranged in sequence from the object side to the image side along the optical axis; the spacing component includes a first spacing element placed on the image side of the first lens and in contact with the image side surface of the first lens, a second spacing element placed on the image side of the second lens and in contact with the image side surface of the second lens, and a third spacing element placed on the image side of the third lens and in contact with the image side surface of the third lens. The object side surface and the image side surface of the first lens are convex and concave respectively; the object side surface and the image side surface of the second lens are both convex; the object side surface and the image side surface of the third lens are both convex; the object side surface and the image side surface of the fourth lens are concave and convex respectively.

[0129] In particular, the optical lens satisfies: 1.85 < L / (T12 + T23) < 2.75; -19.05 < D2s / (f2 / R4) < -12.85; and -13.24 ≤ (f3 + f4) / (T34 + CP3) ≤ -8.76; where L is the maximum height of the lens barrel; T12 is the air gap between the first lens and the second lens on the optical axis; T23 is the air gap between the second lens and the third lens on the optical axis; D2s is the object-side outer diameter of the second spacer element; f2 is the effective focal length of the second lens; R4 is the image-side curvature radius of the second lens; f3 is the effective focal length of the third lens; f4 is the effective focal length of the fourth lens; T34 is the air gap between the third lens and the fourth lens on the optical axis; and CP3 is the maximum thickness of the third spacer element.

[0130] It should be noted that from the relation 1.85 < L / (T12 + T23) < 2.75, it can be seen that the proportion of the air gaps between the first lens and the second lens and between the second lens and the third lens on the optical axis in the total length of the lens is relatively large. While a larger air gap ensures the lens performance, it also leads to a problem of poor performance stability after the lens is assembled. However, the optical lens of the present application can control the outer diameter size of the lens by controlling the focal lengths of the second lens, the third lens, and the fourth lens and the sizes of the spacer elements therebetween, making it more suitable for manufacturing and assembly. At the same time, by balancing the lens focal lengths and the intervals, the performance stability after assembly is ensured.

[0131] According to some embodiments of the present application, the optical lens satisfies: 2.15 ≤ f34 / f ≤ 3.14; and 3.25 < T34 / CP3 < 7.15; where f34 is the combined focal length of the third lens and the fourth lens; f is the effective focal length of the optical lens; T34 is the air gap between the third lens and the fourth lens on the optical axis; and CP3 is the maximum thickness of the third spacer element.

[0132] In this way, by controlling the ratio between the combined focal length f34 of the third lens and the fourth lens and the effective focal length f of the optical lens, the optical lens of the present application helps to optimize the overall structure of the lens, making it more compact and efficient, facilitating the reduction of the lens weight and cost, and at the same time improving the reliability and durability of the lens.

[0133] Preferably, the optical lens satisfies: 2.15 ≤ f34 / f ≤ 3.14; and 3.26 ≤ T34 / CP3 ≤ 7.13.

[0134] According to some embodiments of the present application, the spacing distance EP01 along the optical axis direction from the object side end face of the lens barrel to the object side face of the first spacer element, the object side inner diameter d0s of the lens barrel, and the object side inner diameter d1s of the first spacer element satisfy: 0.60 < EP01 / (d0s - d1s) < 1.0.

[0135] In this way, by controlling the ratio of EP01 to (d0s - d1s), the optical lens of the present application can ensure the correct assembly position of the first spacer element in the lens barrel, guarantee the stability and reliability of the lens; at the same time, it can also reduce the processing error and assembly error of the spacer element, and improve the manufacturing precision and assembly efficiency of the lens.

[0136] Preferably, the spacing distance EP01 along the optical axis direction from the object side end face of the lens barrel to the object side face of the first spacer element, the object side inner diameter d0s of the lens barrel, and the object side inner diameter d1s of the first spacer element satisfy: 0.63 ≤ EP01 / (d0s - d1s) ≤ 0.98.

[0137] According to some embodiments of the present application, the object side inner diameter d0s of the lens barrel and the object side outer diameter D3s of the third spacer element satisfy: 0.85 < d0s / D3s < 1.60.

[0138] In this way, the optical lens of the present application ensures a tight fit between the spacer element and the lens barrel by controlling the radial distance through the relationship 0.85 < d0s / D3s < 1.60, thereby improving the stability and durability of the lens, and being beneficial to reducing the loosening or damage of the spacer element caused by vibration or impact.

[0139] Preferably, the object side inner diameter d0s of the lens barrel and the object side outer diameter D3s of the third spacer element satisfy: 0.88 ≤ d0s / D3s ≤ 1.58. More preferably, the object side inner diameter d0s of the lens barrel and the object side outer diameter D3s of the third spacer element satisfy: 1.40 < d0s / D3s < 1.60.

[0140] It should be noted that those skilled in the art should understand that without departing from the technical solution claimed in the present application, the number of spacer elements constituting the optical lens can be changed to obtain the various results and advantages described in this specification, and the present application does not make specific limitations in this regard. For example, according to needs, the optical imaging lens may also include other numbers of spacer elements different from those described in the above embodiments.

[0141] Some specific but non-restrictive embodiments of the above-mentioned embodiments of the present application are described in more detail below with reference to the accompanying drawings. For ease of description, in the following embodiments, OBJ represents the object surface of the optical lens, STO represents the surface of the aperture, S1 represents the object side surface of the first lens E1, S2 represents the image side surface of the first lens E1, S3 represents the object side surface of the second lens E2, S4 represents the image side surface of the second lens E2, S5 represents the object side surface of the third lens E3, S6 represents the image side surface of the third lens E3, S7 represents the object side surface of the fourth lens E4, and S8 represents the image side surface of the fourth lens E4. In addition, Aj represents the j-th order aspheric coefficient, j=4, 6, 8, 10, 12, 14, 16.

[0142] Embodiment 1

[0143] like Figure 2 As shown, in this embodiment, the optical lens includes a lens barrel P0 and a lens group and a spacing component contained in the lens barrel P0; the lens group includes: a first lens E1, a second lens E2, a third lens E3 and a fourth lens E4 arranged in sequence from the object side to the image side along the optical axis; the spacing component includes a first spacing element P1 placed on the image side of the first lens E1 and in contact with the image side surface S2 of the first lens E1, a second spacing element P2 placed on the image side of the second lens E2 and in contact with the image side surface S4 of the second lens E2, and a third spacing element P3 placed on the image side of the third lens E3 and in contact with the image side surface S6 of the third lens E3.

[0144] In this embodiment, the spacing component also includes a first auxiliary spacing element P1b placed on the image side of the first spacing element P1 and in contact with the image side surface of the first spacing element P1, a first auxiliary spacing element P1c placed on the image side of the first auxiliary spacing element P1b and in contact with the image side surface of the first auxiliary spacing element P1b, a second auxiliary spacing element P2b placed on the image side of the second spacing element P2 and in contact with the image side surface of the second spacing element P2, and a third auxiliary spacing element P2c placed on the image side of the second auxiliary spacing element P2b and in contact with the image side surface of the second auxiliary spacing element P2b.

[0145] In this embodiment, the first lens E1 has negative focal power, and the object-side surface S1 and the image-side surface S2 of the first lens E1 are convex and concave respectively; the second lens E2 has positive focal power, and the object-side surface S3 and the image-side surface S4 of the second lens E2 are both convex; the third lens E3 has positive focal power, and the object-side surface S5 and the image-side surface S6 of the third lens E3 are both convex; the fourth lens E4 has negative focal power, and the object-side surface S7 and the image-side surface S8 of the fourth lens E4 are respectively concave and convex.

[0146] In addition, Table 1 shows the basic optical parameters of the optical imaging lens of Example 1, wherein the units of the curvature radius, thickness / distance and effective radius are all millimeters (mm).

[0147] Table 1: Basic optical parameters of the optical lens of Example 1

[0148]

[0149] It should be noted that the materials in Table 1 include refractive index and Abbe number. For example, the materials 1.538 and 55.64 of S1 in Table 1 respectively indicate that the refractive index of the first lens E1 is 1.538 and the Abbe number is 55.64.

[0150] In this embodiment, the object side surface and the image side surface of any lens from the first lens E1 to the fourth lens E4 are both aspherical surfaces, and the surface shape x of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0151]

[0152] 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 (i.e., 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 2 below gives the high-order coefficients A4, A6, A8, A10, A12, A14, and A16 that can be used for each aspheric mirror surface S1 to S8 in Example 1.

[0153] Table 2: Aspheric coefficients of the optical lens of Example 1

[0154] Face number A4 A6 A8 A10 A12 A14 A16 S1 -3.71E-03 3.34E-05 3.40E-06 -8.70E-08 -2.98E-09 1.73E-10 -2.41E-12 S2 8.99E-03 -7.02E-04 -5.73E-05 3.00E-05 -4.38E-06 3.51E-07 -1.24E-08 S3 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S4 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S5 -2.59E-03 4.94E-05 -1.92E-04 1.33E-05 -2.52E-06 1.10E-07 -7.42E-08 S6 -3.42E-04 -2.25E-04 3.45E-05 -1.26E-05 7.11E-08 1.34E-07 -2.06E-08 S7 2.70E-03 -1.62E-04 2.53E-05 1.19E-05 2.55E-06 -4.35E-07 1.33E-08 S8 7.90E-03 1.88E-04 -4.91E-05 2.21E-05 1.60E-06 -3.14E-07 -8.60E-09

[0155] Embodiment 2

[0156] like Figure 3 As shown, in this embodiment, the optical lens comprises a lens barrel P0 and a lens group and a spacing component contained in the lens barrel P0; the lens group comprises: a first lens E1 with negative optical focal length, a second lens E2 with positive optical focal length, a third lens E3 with positive optical focal length, and a fourth lens E4 with negative optical focal length, which are arranged in sequence from the object side to the image side along the optical axis; the spacing component comprises a first spacing element P1 disposed on the image side of the first lens E1 and in contact with the image side surface S2 of the first lens E1, a second spacing element P2 disposed on the image side of the second lens E2 and in contact with the image side surface S4 of the second lens E2, and a third spacing element P3 disposed on the image side of the third lens E3 and in contact with the image side surface S6 of the third lens E3.

[0157] In this embodiment, the spacing component also includes a first auxiliary spacing element P1b placed on the image side of the first spacing element P1 and in contact with the image side surface of the first spacing element P1, a first auxiliary spacing element P1c placed on the image side of the first auxiliary spacing element P1b and in contact with the image side surface of the first auxiliary spacing element P1b, a second auxiliary spacing element P2b placed on the image side of the second spacing element P2 and in contact with the image side surface of the second spacing element P2, and a third auxiliary spacing element P2c placed on the image side of the second auxiliary spacing element P2b and in contact with the image side surface of the second auxiliary spacing element P2b.

[0158] It is worth noting that compared with the above-mentioned embodiment 1, the optical lens of the second embodiment has the same white object structure, that is, the basic optical parameter table of the optical lens of the second embodiment is the same as Table 1, and the aspheric coefficient table is the same as Table 2. However, the optical lens of the second embodiment has a different black object structure from the optical lens of the first embodiment, that is, the difference between the second embodiment and the first embodiment is that the size values ​​of some structural parameters of the lens barrel and the spacer assembly in the optical lens are different.

[0159] Specifically, the values ​​of the relevant structural parameters in the second embodiment and the first embodiment are respectively as shown in Table 10 below, and the multiple black object parameters specifically include: the inner diameter d1s of the object side of the first spacing element P1; the inner diameter d1m of the image side of the first spacing element P1; the inner diameter d2s of the object side of the second spacing element P2; the inner diameter d2m of the image side of the second spacing element P2; the outer diameter D2s of the object side of the second spacing element P2; the outer diameter D2m of the image side of the second spacing element P2; the inner diameter d3s of the object side of the third spacing element P3; the outer diameter D3s of the object side of the third spacing element P3; the inner diameter d0s of the object side of the lens barrel P0; the outer diameter D0m of the image side of the lens barrel P0; the spacing distance EP01 from the object side end face of the lens barrel P0 to the object side face of the first spacing element P1 along the optical axis; the maximum thickness CP1 of the first spacing element P1; the spacing between the first spacing element P1 and the second spacing element P2 along the optical axis Distance EP12; maximum thickness CP2 of the second spacing element P2; spacing distance EP23 between the second spacing element P2 and the third spacing element P3 along the optical axis; maximum thickness CP3 of the third spacing element P3; maximum height L of the lens barrel P0; maximum thickness CP1b of the first auxiliary spacing element P1b; object side inner diameter d1cs of the first auxiliary spacing element P1c; image side outer diameter D1cm of the first auxiliary spacing element P1c; maximum thickness CP1c of the first auxiliary spacing element P1c; maximum thickness CP2b of the second auxiliary spacing element P2b; spacing distance EP34 between the third spacing element P3 and the fourth spacing element P4 along the optical axis; sum of maximum thicknesses ∑CP1 of all spacing elements between the first lens E1 and the second lens E2; sum of maximum thicknesses ∑CP2 of all spacing elements between the second lens E2 and the third lens E3. It can be understood that the units of the values ​​of the parameters shown in Table 10 are all millimeters (mm), and the schematic diagram of the parameters in the structural diagram of the optical lens is as follows: Figure 1 shown.

[0160] Embodiment 3

[0161] like Figure 4As shown, in this embodiment, the optical lens comprises a lens barrel P0 and a lens group and a spacing component contained in the lens barrel P0; the lens group comprises: a first lens E1 with negative optical focal length, a second lens E2 with positive optical focal length, a third lens E3 with positive optical focal length, and a fourth lens E4 with negative optical focal length, which are arranged in sequence from the object side to the image side along the optical axis; the spacing component comprises a first spacing element P1 disposed on the image side of the first lens E1 and in contact with the image side surface S2 of the first lens E1, a second spacing element P2 disposed on the image side of the second lens E2 and in contact with the image side surface S4 of the second lens E2, and a third spacing element P3 disposed on the image side of the third lens E3 and in contact with the image side surface S6 of the third lens E3.

[0162] In this embodiment, the spacing component also includes a first auxiliary spacing element P1b placed on the image side of the first spacing element P1 and in contact with the image side surface of the first spacing element P1, a first auxiliary spacing element P1c placed on the image side of the first auxiliary spacing element P1b and in contact with the image side surface of the first auxiliary spacing element P1b, a second auxiliary spacing element P2b placed on the image side of the second spacing element P2 and in contact with the image side surface of the second spacing element P2, and a third auxiliary spacing element P2c placed on the image side of the second auxiliary spacing element P2b and in contact with the image side surface of the second auxiliary spacing element P2b.

[0163] It is worth noting that, compared with the above-mentioned embodiment 1, the optical lens of the third embodiment has the same white object structure, that is, the basic optical parameter table of the optical lens of the third embodiment is the same as Table 1, and the aspheric coefficient table is the same as Table 2. However, the optical lens of the third embodiment has a different black object structure from the optical lens of the first embodiment, that is, the difference between the third embodiment and the first embodiment is that the size values ​​of some structural parameters of the lens barrel and the spacer assembly in the optical lens are different. Specifically, the values ​​of the various related structural parameters in the third embodiment are shown in Table 10 below, and the specific description of the multiple black object parameters is the same as the related description in the second embodiment above, which will not be repeated here.

[0164] After simulation test, the axial chromatic aberration curves of the optical lenses in Embodiment 1, Embodiment 2 and Embodiment 3 are as follows: Figure 5A As shown, it indicates the degree of deviation of the focal point of light of different wavelengths after passing through the optical lens; the astigmatism curves of the optical lens in the first embodiment, the second embodiment and the third embodiment are as shown in Figure 5B As shown, it indicates the degree of meridional image curvature and sagittal image curvature. Figure 5A and Figure 5B It can be seen that the optical lenses in Embodiment 1, Embodiment 2 and Embodiment 3 can all achieve good imaging quality.

[0165] Embodiment 4

[0166] like Figure 6 As shown, in this embodiment, the optical lens comprises a lens barrel P0 and a lens group and a spacing component contained in the lens barrel P0; the lens group comprises: a first lens E1 with negative optical focal length, a second lens E2 with positive optical focal length, a third lens E3 with positive optical focal length, and a fourth lens E4 with negative optical focal length, which are arranged in sequence from the object side to the image side along the optical axis; the spacing component comprises a first spacing element P1 disposed on the image side of the first lens E1 and in contact with the image side surface S2 of the first lens E1, a second spacing element P2 disposed on the image side of the second lens E2 and in contact with the image side surface S4 of the second lens E2, and a third spacing element P3 disposed on the image side of the third lens E3 and in contact with the image side surface S6 of the third lens E3.

[0167] In this embodiment, the spacing component also includes a first auxiliary spacing element P1b placed on the image side of the first spacing element P1 and in contact with the image side surface of the first spacing element P1, a first auxiliary spacing element P1c placed on the image side of the first auxiliary spacing element P1b and in contact with the image side surface of the first auxiliary spacing element P1b, a second auxiliary spacing element P2b placed on the image side of the second spacing element P2 and in contact with the image side surface of the second spacing element P2, and a third auxiliary spacing element P2c placed on the image side of the second auxiliary spacing element P2b and in contact with the image side surface of the second auxiliary spacing element P2b.

[0168] In this embodiment, the first lens E1 has negative focal power, and the object-side surface S1 and the image-side surface S2 of the first lens E1 are convex and concave respectively; the second lens E2 has positive focal power, and the object-side surface S3 and the image-side surface S4 of the second lens E2 are both convex; the third lens E3 has positive focal power, and the object-side surface S5 and the image-side surface S6 of the third lens E3 are both convex; the fourth lens E4 has negative focal power, and the object-side surface S7 and the image-side surface S8 of the fourth lens E4 are respectively concave and convex.

[0169] In addition, Table 3 shows the basic optical parameters of the optical imaging lens of Example 4, wherein the units of the curvature radius, thickness / distance and effective radius are all millimeters (mm).

[0170] Table 3: Basic optical parameters of the optical lens of Example 4

[0171]

[0172]

[0173] In this embodiment, the object side surface and the image side surface of the second lens E2 are both spherical surfaces, and the object side surface and the image side surface of any one of the first lens E1, the third lens E3 and the fourth lens E4 are both aspherical surfaces, and the surface shape of each aspherical lens can be defined by the aspherical surface formula given in the above embodiment 1. Table 4 below gives the high-order coefficients A4, A6, A8, A10, A12, A14, A16 of each aspherical mirror surface S1, S2 and S5 to S8 that can be used in embodiment 4.

[0174] Table 4: Aspheric coefficients of the optical lens of Example 4

[0175] Face number A4 A6 A8 A10 A12 A14 A16 S1 -2.67E-03 4.89E-05 2.31E-06 -1.03E-07 -2.36E-09 2.11E-10 -3.57E-12 S2 9.53E-03 -5.18E-04 -7.60E-05 3.13E-05 -4.23E-06 3.01E-07 -9.25E-09 S5 -1.82E-03 -2.22E-04 -8.06E-05 2.36E-05 -6.29E-06 2.74E-08 3.68E-08 S6 8.94E-04 3.93E-05 1.03E-04 -1.89E-05 -1.78E-06 6.72E-08 4.07E-08 S7 2.34E-03 -3.18E-04 4.60E-05 1.89E-05 -5.06E-07 -8.12E-07 1.08E-07 S8 8.57E-03 -1.26E-04 -1.53E-04 3.03E-05 1.13E-06 -5.14E-07 2.06E-08

[0176] Embodiment 5

[0177] like Figure 7 As shown, in this embodiment, the optical lens comprises a lens barrel P0 and a lens group and a spacing component contained in the lens barrel P0; the lens group comprises: a first lens E1 with negative optical focal length, a second lens E2 with positive optical focal length, a third lens E3 with positive optical focal length, and a fourth lens E4 with negative optical focal length, which are arranged in sequence from the object side to the image side along the optical axis; the spacing component comprises a first spacing element P1 disposed on the image side of the first lens E1 and in contact with the image side surface S2 of the first lens E1, a second spacing element P2 disposed on the image side of the second lens E2 and in contact with the image side surface S4 of the second lens E2, and a third spacing element P3 disposed on the image side of the third lens E3 and in contact with the image side surface S6 of the third lens E3.

[0178] In this embodiment, the spacing component also includes a first auxiliary spacing element P1b placed on the image side of the first spacing element P1 and in contact with the image side surface of the first spacing element P1, a first auxiliary spacing element P1c placed on the image side of the first auxiliary spacing element P1b and in contact with the image side surface of the first auxiliary spacing element P1b, a second auxiliary spacing element P2b placed on the image side of the second spacing element P2 and in contact with the image side surface of the second spacing element P2, and a third auxiliary spacing element P2c placed on the image side of the second auxiliary spacing element P2b and in contact with the image side surface of the second auxiliary spacing element P2b.

[0179] It is worth noting that, compared with the above-mentioned fourth embodiment, the optical lens of the fifth embodiment has the same white object structure, that is, the basic optical parameter table of the optical lens of the fifth embodiment is the same as Table 3, and the aspheric coefficient table is the same as Table 4. However, the optical lens of the fifth embodiment has a different black object structure from the optical lens of the fourth embodiment, that is, the difference between the fifth embodiment and the fourth embodiment is that the size values ​​of some structural parameters of the lens barrel and the spacer assembly in the optical lens are different. Specifically, the values ​​of the various related structural parameters in the fifth embodiment are shown in Table 10 below, and the specific description of the multiple black object parameters is the same as the related description in the second embodiment above, which will not be repeated here.

[0180] Embodiment 6

[0181] like Figure 8 As shown, in this embodiment, the optical lens comprises a lens barrel P0 and a lens group and a spacing component contained in the lens barrel P0; the lens group comprises: a first lens E1 with negative optical focal length, a second lens E2 with positive optical focal length, a third lens E3 with positive optical focal length, and a fourth lens E4 with negative optical focal length, which are arranged in sequence from the object side to the image side along the optical axis; the spacing component comprises a first spacing element P1 disposed on the image side of the first lens E1 and in contact with the image side surface S2 of the first lens E1, a second spacing element P2 disposed on the image side of the second lens E2 and in contact with the image side surface S4 of the second lens E2, and a third spacing element P3 disposed on the image side of the third lens E3 and in contact with the image side surface S6 of the third lens E3.

[0182] In this embodiment, the spacing component also includes a first auxiliary spacing element P1b placed on the image side of the first spacing element P1 and in contact with the image side surface of the first spacing element P1, a first auxiliary spacing element P1c placed on the image side of the first auxiliary spacing element P1b and in contact with the image side surface of the first auxiliary spacing element P1b, a second auxiliary spacing element P2b placed on the image side of the second spacing element P2 and in contact with the image side surface of the second spacing element P2, and a third auxiliary spacing element P2c placed on the image side of the second auxiliary spacing element P2b and in contact with the image side surface of the second auxiliary spacing element P2b.

[0183] It is worth noting that, compared with the above-mentioned fourth embodiment, the optical lens of the sixth embodiment has the same white object structure, that is, the basic optical parameter table of the optical lens of the sixth embodiment is the same as Table 3, and the aspheric coefficient table is the same as Table 4. However, the optical lens of the sixth embodiment has a different black object structure from the optical lens of the fourth embodiment, that is, the difference between the sixth embodiment and the fourth embodiment is that the size values ​​of some structural parameters of the lens barrel and the spacer assembly in the optical lens are different. Specifically, the values ​​of the various related structural parameters in the sixth embodiment are shown in Table 10 below, and the specific description of the multiple black object parameters is the same as the related description in the second embodiment above, which will not be repeated here.

[0184] After simulation test, the axial chromatic aberration curves of the optical lenses in the fourth, fifth and sixth embodiments are as follows: Fig.9A As shown, it indicates the degree of deviation of the focal point of light of different wavelengths after passing through the optical lens; the astigmatism curves of the optical lens in the fourth embodiment, the fifth embodiment and the sixth embodiment are as shown in Fig. 9B As shown, it indicates the degree of meridional image curvature and sagittal image curvature. Fig.9A and Fig. 9B It can be seen that the optical lenses in the fourth embodiment, the fifth embodiment and the sixth embodiment can all achieve good imaging quality.

[0185] Embodiment 7

[0186] like Fig.10 As shown, in this embodiment, the optical lens comprises a lens barrel P0 and a lens group and a spacing component contained in the lens barrel P0; the lens group comprises: a first lens E1 with negative optical focal length, a second lens E2 with positive optical focal length, a third lens E3 with positive optical focal length, and a fourth lens E4 with negative optical focal length, which are arranged in sequence from the object side to the image side along the optical axis; the spacing component comprises a first spacing element P1 disposed on the image side of the first lens E1 and in contact with the image side surface S2 of the first lens E1, a second spacing element P2 disposed on the image side of the second lens E2 and in contact with the image side surface S4 of the second lens E2, and a third spacing element P3 disposed on the image side of the third lens E3 and in contact with the image side surface S6 of the third lens E3.

[0187] In this embodiment, the spacing component also includes a first auxiliary spacing element P1b placed on the image side of the first spacing element P1 and in contact with the image side surface of the first spacing element P1, a first auxiliary spacing element P1c placed on the image side of the first auxiliary spacing element P1b and in contact with the image side surface of the first auxiliary spacing element P1b, a second auxiliary spacing element P2b placed on the image side of the second spacing element P2 and in contact with the image side surface of the second spacing element P2, and a third auxiliary spacing element P2c placed on the image side of the second auxiliary spacing element P2b and in contact with the image side surface of the second auxiliary spacing element P2b.

[0188] In this embodiment, the first lens E1 has negative focal power, and the object-side surface S1 and the image-side surface S2 of the first lens E1 are convex and concave respectively; the second lens E2 has positive focal power, and the object-side surface S3 and the image-side surface S4 of the second lens E2 are both convex; the third lens E3 has positive focal power, and the object-side surface S5 and the image-side surface S6 of the third lens E3 are both convex; the fourth lens E4 has negative focal power, and the object-side surface S7 and the image-side surface S8 of the fourth lens E4 are respectively concave and convex.

[0189] In addition, Table 5 shows the basic optical parameters of the optical imaging lens of Example 7, wherein the units of the curvature radius, thickness / distance and effective radius are all millimeters (mm).

[0190] Table 5: Basic optical parameters of the optical lens of Example 7

[0191]

[0192] In this embodiment, the object side surface and the image side surface of the second lens E2 are both spherical surfaces, and the object side surface and the image side surface of any one of the first lens E1, the third lens E3 and the fourth lens E4 are both aspherical surfaces, and the surface shape of each aspherical lens can be defined by the aspherical surface formula given in the above embodiment 1. Table 6 below gives the high-order coefficients A4, A6, A8, A10, A12, A14, A16 of each aspherical mirror surface S1, S2 and S5 to S8 that can be used in embodiment 7.

[0193] Table 6: Aspheric coefficients of the optical lens of Example 7

[0194] Face number A4 A6 A8 A10 A12 A14 A16 S1 -2.97E-03 4.78E-05 2.52E-06 -1.03E-07 -2.57E-09 2.14E-10 -3.44E-12 S2 8.72E-03 -5.36E-04 -7.11E-05 3.17E-05 -4.42E-06 3.08E-07 -8.74E-09 S5 -1.81E-03 -1.72E-04 -1.00E-04 2.53E-05 -4.71E-06 -1.16E-07 1.25E-08 S6 9.77E-04 -7.46E-06 1.04E-04 -1.77E-05 -2.61E-06 5.18E-08 2.75E-08 S7 2.53E-03 -2.78E-04 4.61E-05 1.50E-05 -1.24E-06 -8.44E-07 1.02E-07 S8 8.53E-03 -1.27E-04 -1.44E-04 3.01E-05 6.08E-07 -5.40E-07 2.86E-08

[0195] Embodiment 8

[0196] like Fig.11As shown, in this embodiment, the optical lens comprises a lens barrel P0 and a lens group and a spacing component contained in the lens barrel P0; the lens group comprises: a first lens E1 with negative optical focal length, a second lens E2 with positive optical focal length, a third lens E3 with positive optical focal length, and a fourth lens E4 with negative optical focal length, which are arranged in sequence from the object side to the image side along the optical axis; the spacing component comprises a first spacing element P1 disposed on the image side of the first lens E1 and in contact with the image side surface S2 of the first lens E1, a second spacing element P2 disposed on the image side of the second lens E2 and in contact with the image side surface S4 of the second lens E2, and a third spacing element P3 disposed on the image side of the third lens E3 and in contact with the image side surface S6 of the third lens E3.

[0197] In this embodiment, the spacing component also includes a first auxiliary spacing element P1b placed on the image side of the first spacing element P1 and in contact with the image side surface of the first spacing element P1, a first auxiliary spacing element P1c placed on the image side of the first auxiliary spacing element P1b and in contact with the image side surface of the first auxiliary spacing element P1b, a second auxiliary spacing element P2b placed on the image side of the second spacing element P2 and in contact with the image side surface of the second spacing element P2, and a third auxiliary spacing element P2c placed on the image side of the second auxiliary spacing element P2b and in contact with the image side surface of the second auxiliary spacing element P2b.

[0198] It is worth noting that, compared with the above-mentioned embodiment 7, the optical lens of the embodiment 8 has the same white object structure, that is, the basic optical parameter table of the optical lens of the embodiment 8 is the same as Table 5, and the aspheric coefficient table is the same as Table 6. However, the optical lens of the embodiment 8 has a different black object structure from the optical lens of the embodiment 7, that is, the difference between the embodiment 8 and the embodiment 7 is that the size values ​​of some structural parameters of the lens barrel and the spacer assembly in the optical lens are different. Specifically, the values ​​of the various related structural parameters in the embodiment 8 are shown in Table 10 below, and the specific description of the multiple black object parameters is the same as the related description in the above-mentioned embodiment 2, which will not be repeated here.

[0199] Embodiment 9

[0200] like Fig.12As shown, in this embodiment, the optical lens comprises a lens barrel P0 and a lens group and a spacing component contained in the lens barrel P0; the lens group comprises: a first lens E1 with negative optical focal length, a second lens E2 with positive optical focal length, a third lens E3 with positive optical focal length, and a fourth lens E4 with negative optical focal length, which are arranged in sequence from the object side to the image side along the optical axis; the spacing component comprises a first spacing element P1 disposed on the image side of the first lens E1 and in contact with the image side surface S2 of the first lens E1, a second spacing element P2 disposed on the image side of the second lens E2 and in contact with the image side surface S4 of the second lens E2, and a third spacing element P3 disposed on the image side of the third lens E3 and in contact with the image side surface S6 of the third lens E3.

[0201] In this embodiment, the spacing component also includes a first auxiliary spacing element P1b placed on the image side of the first spacing element P1 and in contact with the image side surface of the first spacing element P1, a first auxiliary spacing element P1c placed on the image side of the first auxiliary spacing element P1b and in contact with the image side surface of the first auxiliary spacing element P1b, a second auxiliary spacing element P2b placed on the image side of the second spacing element P2 and in contact with the image side surface of the second spacing element P2, and a third auxiliary spacing element P2c placed on the image side of the second auxiliary spacing element P2b and in contact with the image side surface of the second auxiliary spacing element P2b.

[0202] It is worth noting that, compared with the above-mentioned embodiment 7, the optical lens of the embodiment 9 has the same white object structure, that is, the basic optical parameter table of the optical lens of the embodiment 9 is the same as Table 5, and the aspheric coefficient table is the same as Table 6. However, the optical lens of the embodiment 9 has a different black object structure from the optical lens of the embodiment 7, that is, the difference between the embodiment 9 and the embodiment 7 is that the size values ​​of some structural parameters of the lens barrel and the spacer assembly in the optical lens are different. Specifically, the values ​​of the various related structural parameters in the embodiment 9 are shown in Table 10 below, and the specific description of the multiple black object parameters is the same as the related description in the above-mentioned embodiment 2, which will not be repeated here.

[0203] After simulation test, the axial chromatic aberration curves of the optical lenses in Embodiment 7, Embodiment 8 and Embodiment 9 are as follows: Fig.13A As shown, it indicates the degree of deviation of the focal point of light of different wavelengths after passing through the optical lens; the astigmatism curves of the optical lens in the seventh embodiment, the eighth embodiment and the ninth embodiment are as shown in Fig. 13B As shown, it indicates the degree of meridional image curvature and sagittal image curvature. Fig.13A and Fig. 13B It can be seen that the optical lenses in the seventh embodiment, the eighth embodiment and the ninth embodiment can all achieve good imaging quality.

[0204] Embodiment 10

[0205] like Fig.14 As shown, in this embodiment, the optical lens comprises a lens barrel P0 and a lens group and a spacing component contained in the lens barrel P0; the lens group comprises: a first lens E1 with negative optical focal length, a second lens E2 with positive optical focal length, a third lens E3 with positive optical focal length, and a fourth lens E4 with negative optical focal length, which are arranged in sequence from the object side to the image side along the optical axis; the spacing component comprises a first spacing element P1 disposed on the image side of the first lens E1 and in contact with the image side surface S2 of the first lens E1, a second spacing element P2 disposed on the image side of the second lens E2 and in contact with the image side surface S4 of the second lens E2, and a third spacing element P3 disposed on the image side of the third lens E3 and in contact with the image side surface S6 of the third lens E3.

[0206] In this embodiment, the spacing component also includes a first auxiliary spacing element P1b placed on the image side of the first spacing element P1 and in contact with the image side surface of the first spacing element P1, a first auxiliary spacing element P1c placed on the image side of the first auxiliary spacing element P1b and in contact with the image side surface of the first auxiliary spacing element P1b, a second auxiliary spacing element P2b placed on the image side of the second spacing element P2 and in contact with the image side surface of the second spacing element P2, and a third auxiliary spacing element P2c placed on the image side of the second auxiliary spacing element P2b and in contact with the image side surface of the second auxiliary spacing element P2b.

[0207] In this embodiment, the first lens E1 has negative focal power, and the object-side surface S1 and the image-side surface S2 of the first lens E1 are convex and concave respectively; the second lens E2 has positive focal power, and the object-side surface S3 and the image-side surface S4 of the second lens E2 are both convex; the third lens E3 has positive focal power, and the object-side surface S5 and the image-side surface S6 of the third lens E3 are both convex; the fourth lens E4 has negative focal power, and the object-side surface S7 and the image-side surface S8 of the fourth lens E4 are respectively concave and convex.

[0208] In addition, Table 7 shows the basic optical parameters of the optical imaging lens of Example 10, wherein the units of the curvature radius, thickness / distance and effective radius are all millimeters (mm).

[0209] Table 7: Basic optical parameters of the optical lens of Example 10

[0210]

[0211] In this embodiment, the object side surface and the image side surface of the second lens E2 are both spherical surfaces, and the object side surface and the image side surface of any one of the first lens E1, the third lens E3 and the fourth lens E4 are both aspherical surfaces, and the surface shape of each aspherical lens can be defined by the aspherical surface formula given in the above embodiment 1. The following table 8 gives the high-order coefficients A4, A6, A8, A10, A12, A14, A16 of each aspherical mirror surface S1, S2 and S5 to S8 that can be used in embodiment 10.

[0212] Table 8: Aspheric coefficients of the optical lens of Example 10

[0213] Face number A4 A6 A8 A10 A12 A14 A16 S1 -3.10E-03 4.59E-05 2.54E-06 -9.69E-08 -2.51E-09 2.08E-10 -3.55E-12 S2 8.19E-03 -5.66E-04 -6.86E-05 3.13E-05 -4.29E-06 2.95E-07 -8.79E-09 S5 -1.87E-03 -2.02E-04 -1.04E-04 2.52E-05 -4.58E-06 3.61E-08 -1.30E-08 S6 9.30E-04 -2.01E-05 1.08E-04 -1.44E-05 -2.98E-06 -3.97E-07 1.08E-07 S7 2.57E-03 -2.38E-04 5.69E-05 1.31E-05 -2.74E-06 -9.39E-07 1.75E-07 S8 8.15E-03 -1.21E-04 -1.57E-04 2.80E-05 1.53E-06 -7.39E-07 5.00E-08

[0214] Embodiment 11

[0215] like Fig.15 As shown, in this embodiment, the optical lens comprises a lens barrel P0 and a lens group and a spacing component contained in the lens barrel P0; the lens group comprises: a first lens E1 with negative optical focal length, a second lens E2 with positive optical focal length, a third lens E3 with positive optical focal length, and a fourth lens E4 with negative optical focal length, which are arranged in sequence from the object side to the image side along the optical axis; the spacing component comprises a first spacing element P1 disposed on the image side of the first lens E1 and in contact with the image side surface S2 of the first lens E1, a second spacing element P2 disposed on the image side of the second lens E2 and in contact with the image side surface S4 of the second lens E2, and a third spacing element P3 disposed on the image side of the third lens E3 and in contact with the image side surface S6 of the third lens E3.

[0216] In this embodiment, the spacing component also includes a first auxiliary spacing element P1b placed on the image side of the first spacing element P1 and in contact with the image side surface of the first spacing element P1, a first auxiliary spacing element P1c placed on the image side of the first auxiliary spacing element P1b and in contact with the image side surface of the first auxiliary spacing element P1b, a second auxiliary spacing element P2b placed on the image side of the second spacing element P2 and in contact with the image side surface of the second spacing element P2, and a third auxiliary spacing element P2c placed on the image side of the second auxiliary spacing element P2b and in contact with the image side surface of the second auxiliary spacing element P2b.

[0217] It is worth noting that, compared with the above-mentioned embodiment 10, the optical lens of the embodiment 11 has the same white object structure, that is, the basic optical parameter table of the optical lens of the embodiment 11 is the same as Table 7, and the aspheric coefficient table is the same as Table 8. However, the optical lens of the embodiment 11 has a different black object structure from the optical lens of the above-mentioned embodiment 10, that is, the difference between the embodiment 11 and the above-mentioned embodiment 10 is that the size values ​​of some structural parameters of the lens barrel and the spacer assembly in the optical lens are different. Specifically, the values ​​of the various related structural parameters in the embodiment 11 are shown in Table 10 below, and the specific description of the multiple black object parameters is the same as the related description in the above-mentioned embodiment 2, which will not be repeated here.

[0218] Embodiment 12

[0219] like Fig.16 As shown, in this embodiment, the optical lens comprises a lens barrel P0 and a lens group and a spacing component contained in the lens barrel P0; the lens group comprises: a first lens E1 with negative optical focal length, a second lens E2 with positive optical focal length, a third lens E3 with positive optical focal length, and a fourth lens E4 with negative optical focal length, which are arranged in sequence from the object side to the image side along the optical axis; the spacing component comprises a first spacing element P1 disposed on the image side of the first lens E1 and in contact with the image side surface S2 of the first lens E1, a second spacing element P2 disposed on the image side of the second lens E2 and in contact with the image side surface S4 of the second lens E2, and a third spacing element P3 disposed on the image side of the third lens E3 and in contact with the image side surface S6 of the third lens E3.

[0220] In this embodiment, the spacing component also includes a first auxiliary spacing element P1b placed on the image side of the first spacing element P1 and in contact with the image side surface of the first spacing element P1, a first auxiliary spacing element P1c placed on the image side of the first auxiliary spacing element P1b and in contact with the image side surface of the first auxiliary spacing element P1b, a second auxiliary spacing element P2b placed on the image side of the second spacing element P2 and in contact with the image side surface of the second spacing element P2, and a third auxiliary spacing element P2c placed on the image side of the second auxiliary spacing element P2b and in contact with the image side surface of the second auxiliary spacing element P2b.

[0221] It is worth noting that, compared with the above-mentioned embodiment 10, the optical lens of the embodiment 12 has the same white object structure, that is, the basic optical parameter table of the optical lens of the embodiment 12 is the same as Table 7, and the aspheric coefficient table is the same as Table 8. However, the optical lens of the embodiment 12 has a different black object structure from the optical lens of the above-mentioned embodiment 10, that is, the difference between the embodiment 12 and the above-mentioned embodiment 10 is that the size values ​​of some structural parameters of the lens barrel and the spacer assembly in the optical lens are different. Specifically, the values ​​of the various related structural parameters in the embodiment 12 are shown in Table 10 below, and the specific description of the multiple black object parameters is the same as the related description in the above-mentioned embodiment 2, which will not be repeated here.

[0222] After simulation test, the axial chromatic aberration curves of the optical lenses in the tenth embodiment, the eleventh embodiment and the twelfth embodiment are as follows: Fig.17A As shown, it indicates the degree of deviation of the focal point of light of different wavelengths after passing through the optical lens; the astigmatism curves of the optical lenses in the tenth embodiment, the eleventh embodiment and the twelfth embodiment are as shown in Fig. 17B As shown, it indicates the degree of meridional image curvature and sagittal image curvature. Fig.17A and Fig. 17B It can be seen that the optical lenses in the tenth embodiment, the eleventh embodiment and the twelfth embodiment can all achieve good imaging quality.

[0223] In summary, in Examples 1 to 12, the effective focal lengths f1 to f4 of the first lens E1 to the fourth lens E4 in the optical lens, the effective focal length f of the optical lens, half of the maximum field of view Semi-FOV of the optical lens, and the aperture coefficient Fno of the optical lens are respectively as shown in Table 9 below.

[0224] Table 9: System optical parameters of optical lens

[0225]

[0226]

[0227] In addition, the black object structure parameters of the optical lens in Examples 1 to 12 are specifically shown in Table 10.

[0228] Table 10: Black object structure parameter table of optical lens

[0229]

[0230] In summary, the optical lenses in Embodiment 1 to Embodiment 12 satisfy the relationship shown in Table 11, as shown in Table 11.

[0231] Table 11: Relationships satisfied by optical lenses

[0232]

[0233]

[0234] It is worth mentioning that according to one aspect of the present application, an embodiment of the present application further provides a camera module, which may include the above-mentioned optical lens and a photosensitive element, and the photosensitive element is arranged on the image side of the optical lens to form an image. It is understandable that the photosensitive element mentioned in the present application may be implemented as a charge coupled device (CCD) or a complementary metal oxide semiconductor element (CMOS), but is not limited to this, and the present application will not repeat it.

[0235] In addition, according to another aspect of the present application, an embodiment of the present application further provides an electronic device, which may include a camera module and a processor configured as described above, wherein the camera module is communicatively connected to the processor for acquiring image data and inputting the image data into the processor for processing. It is understood that the electronic device mentioned in the present application may be, but is not limited to, implemented as a device such as a mobile phone equipped with the camera module, and the present application will not elaborate on this.

[0236] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0237] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. An optical lens, characterized in that: The optical lens comprises a lens barrel, a lens group and a spacer assembly contained in the lens barrel; the lens group comprises: a first lens with negative optical power, a second lens with positive optical power, a third lens with positive optical power and a fourth lens with negative optical power, which are arranged in sequence from the object side to the image side along the optical axis; the spacer assembly comprises a first spacer element disposed on the image side of the first lens and in contact with the image side surface of the first lens, a second spacer element disposed on the image side of the second lens and in contact with the image side surface of the second lens and a third spacer element disposed on the image side of the third lens and in contact with the image side surface of the third lens; the optical lens satisfies: 1.85 <L / (T12+T23)<2.75; 1.45<(EP12+CP1) / (EP23+CP2)<2.35; and 2.05<(d1s+d2s) / d3s<2.25; Among them, L is the maximum height of the lens barrel; T12 is the air gap between the first lens and the second lens on the optical axis; T23 is the air gap between the second lens and the third lens on the optical axis; EP12 is the spacing distance between the first spacing element and the second spacing element along the optical axis; CP1 is the maximum thickness of the first spacing element; EP23 is the spacing distance between the second spacing element and the third spacing element along the optical axis; CP2 is the maximum thickness of the second spacing element; d1s is the object side inner diameter of the first spacing element; d2s is the object side inner diameter of the second spacing element; d3s is the object side inner diameter of the third spacing element.

2. The optical lens according to claim 1, characterized in that: A spacer element having a maximum thickness between 3.80 mm and 4.83 mm is provided between the first lens and the second lens; the spacer element satisfies: 6.25mm<∑CP1+∑CP2<8.15mm; Wherein, ∑CP1 is the sum of the maximum thicknesses of all spacing elements between the first lens and the second lens; ∑CP2 is the sum of the maximum thicknesses of all spacing elements between the second lens and the third lens.

3. The optical lens according to claim 1, characterized in that: The spacer assembly further includes a first auxiliary spacer element disposed on the image side of the first spacer element and in contact with the image side surface of the first spacer element, and a first auxiliary spacer element disposed on the image side of the first auxiliary spacer element and in contact with the image side surface of the first auxiliary spacer element; the object side inner diameter d1cs of the first auxiliary spacer element, the image side outer diameter D2m of the second spacer element, and the image side inner diameter d2m of the second spacer element satisfy: 0.35 <d1cs / (D2m-d2m)<0.70。 4. The optical lens according to claim 1, characterized in that: The object side outer diameter D2s of the second spacer element, the effective focal length f2 of the second lens, and the image side curvature radius R4 of the second lens satisfy: -19.05mm <D2s / (f2 / R4)<-12.85mm。 5. The optical lens according to claim 1, characterized in that: The distance EP01 from the object side end surface of the lens barrel to the object side surface of the first spacer element along the optical axis direction and the center thickness CT1 of the first lens satisfy: 1.95 <EP01 / CT1<5.15。 6. The optical lens according to claim 1, characterized in that: The object-side outer diameter D2s of the second spacer element, the object-side inner diameter d2s of the second spacer element, and the image-side inner diameter d1m of the first spacer element satisfy: 1.05 < (D2s - d2s) / d1m < 1.

80.

7. The optical lens according to claim 1, characterized in that: The spacer assembly further includes a first auxiliary spacer element disposed on the image side of the first spacer element and in contact with the image side surface of the first spacer element, and a second auxiliary spacer element disposed on the image side of the second spacer element and in contact with the image side surface of the second spacer element; the optical lens satisfies: 1.35 < T12 / (CT1 + CT2) < 1.85; and 0.28 ≤ (CP1b + CP2b) / L ≤ 0.43; wherein, T12 is the air gap between the first lens and the second lens on the optical axis; CT1 is the central thickness of the first lens; CT2 is the central thickness of the second lens; CP1b is the maximum thickness of the first auxiliary spacer element; CP2b is the maximum thickness of the second auxiliary spacer element.

8. The optical lens according to claim 1, characterized in that: The object-side inner diameter d3s of the third spacer element, the effective focal length f3 of the third lens, and the object-side curvature radius R5 of the third lens satisfy: 5.20 mm < d3s / (f3 / R5) < 7.0 mm.

9. The optical lens according to claim 1, characterized in that: The spacer assembly further includes a first auxiliary spacer element disposed on the image side of the first spacer element and in contact with the image side surface of the first spacer element; the spacing distance EP12 between the first spacer element and the second spacer element along the optical axis and the maximum thickness CP1b of the first auxiliary spacer element satisfy: 1.35 < EP12 / CP1b < 1.

70.

10. The optical lens according to any one of claims 1 to 9, characterized in that: The object-side surface and the image-side surface of the first lens are a convex surface and a concave surface respectively; the object-side curvature radius R1 of the first lens, the image-side curvature radius R2 of the first lens, and the object-side inner diameter d1s of the first spacer element satisfy: 1.20 < (R1 + R2) / d1s < 1.

75.

11. The optical lens according to claim 1, characterized in that: The object-side surface and the image-side surface of the second lens are both convex surfaces; the object-side surface and the image-side surface of the third lens are both convex surfaces; the object-side surface and the image-side surface of the fourth lens are a concave surface and a convex surface respectively; the optical lens satisfies: 2.05 mm < f / tan(Semi-FOV) < 3.75 mm; and 1.10 < L / D0m < 1.95; wherein, f is the effective focal length of the optical lens; Semi-FOV is half of the maximum field of view angle of the optical lens; L is the maximum height of the lens barrel; D0m is the image-side outer diameter of the lens barrel.

12. The optical lens according to any one of claims 1 to 9, characterized in that: The spacer assembly further includes a first auxiliary spacer element disposed on the image side of the first spacer element and in contact with the image side surface of the first spacer element and a first secondary auxiliary spacer element disposed on the image side of the first auxiliary spacer element and in contact with the image side surface of the first auxiliary spacer element; the image-side outer diameter D1cm of the first secondary auxiliary spacer element, the object-side inner diameter d1cs of the first secondary auxiliary spacer element, the image-side outer diameter D2m of the second spacer element, and the object-side inner diameter d2s of the second spacer element satisfy: 0.95<(D1cm-d1cs) / (D2m-d2s)<1.

20.

13. The optical lens according to any one of claims 1 to 9, characterized in that: The optical lens meets the following requirements: 1.01≤EB34 / (CT3+CT4)≤1.10; Among them, EB34 is the distance from the structural area of ​​the third lens closest to the object side to the structural area of ​​the fourth lens closest to the image side along the optical axis; CT3 is the center thickness of the third lens; CT4 is the center thickness of the fourth lens.

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