Optical lens

Abstract

The utility model 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] This application relates to the field of optical device technology, and in particular to an optical lens. Background Technology

[0002] With the rapid development of science and technology and the increasing demand for security, surveillance cameras have become an important part of the security industry, driving the entire industry forward. In recent years, the types of surveillance cameras have become increasingly diverse, among which fixed-focus lenses occupy a leading position in the security monitoring field due to their high image quality, large aperture, and stable image quality.

[0003] However, traditional prime lenses often contain a large number of lens elements, resulting in a bulky and heavy lens that not only wastes manpower and resources but also causes inconvenience in use. Although some prime lenses on the market now use a four-lens structure to reduce lens size and weight, the distribution of these lenses usually results in large air gaps between them. These large air gaps can significantly affect lens performance (such as modulation transfer function (MTF) and field of view), thereby impacting the image quality of the prime lens. Utility Model Content

[0004] One advantage of this application is that it provides an optical lens that can solve the adverse effects of large air gaps on lens performance in traditional fixed-focus lenses.

[0005] On one hand, this application provides an optical lens, including a lens barrel and a lens group and a spacer assembly housed within the lens barrel; the lens group includes, arranged sequentially along the optical axis from the object side to the image side: 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; 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 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] 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; EP12 is the distance between the first spacer element and the second spacer element along the optical axis; CP1 is the maximum thickness of the first spacer element; EP23 is the distance between the second spacer element and the third spacer element along the optical axis; CP2 is the maximum thickness of the second spacer element; d1s is the object-side inner diameter of the first spacer element; d2s is the object-side inner diameter of the second spacer element; and d3s is the object-side inner diameter of the third spacer element.

[0010] In some embodiments of this 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 element satisfies: 6.25 mm < ∑CP1 + ∑CP2 < 8.15 mm; where ∑CP1 is the sum of the maximum thicknesses of all spacer elements between the first lens and the second lens; and ∑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 this 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 image-side inner diameter d2m of the second spacing element satisfies:

[0012] 0.35 <d1cs / (D2m-d2m)<0.70。

[0013] In some embodiments of this 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 radius of curvature R4 of the second lens satisfy the following:

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

[0015] In some embodiments of this application, the distance EP01 from the object-side end face of the lens barrel to the object-side surface of the first spacer element along the optical axis satisfies the following condition:

[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] where, T12 is the air gap between the first lens and the second lens on the optical axis; CT1 is the center thickness of the first lens; CT2 is the center 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 spacer 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 convex and concave surfaces 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 concave and convex surfaces respectively; the optical lens satisfies:

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

[0031] 1.10 < L / D0m < 1.95;

[0032] where f is the effective focal length of the optical lens; Semi - FOV is half of the maximum field 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 - level 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 outer diameter D1cm of the image side of the first - level auxiliary spacer element, the inner diameter d1cs of the object side of the first - level auxiliary 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] where 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, comprising a lens barrel, a lens group and a spacer assembly accommodated within the lens barrel; the lens group includes, arranged in sequence along the optical axis from the object side to the image side: 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 placed on the image side of the first lens and in contact with the image side surface of the first lens, a second spacer 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 spacer 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 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] 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; 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] 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; CP3 is the maximum thickness of the third spacer element.

[0047] In 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:

[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, the optical powers of the four lenses in the optical lens of the present application 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 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 offset will also cause the MTF peak to drop. Based on this, the present application indirectly controls the structural region thicknesses of the second lens and the third lens and the thicknesses of the spacer elements by restricting the spacing distance EP12 along the optical axis direction between the first spacer element and the second spacer element, the maximum thickness CP1 of the first spacer element, the spacing distance EP23 along the optical axis direction 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 thicknesses of the lenses and the thicknesses and inner diameters of the spacer elements. 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 4This is a schematic diagram of the structure of an optical lens according to Embodiment 3 of this application;

[0056] Figure 5A A schematic diagram of the on-axis chromatic aberration curves of the optical lenses according to the above-described Embodiment 1, Embodiment 2 and Embodiment 3 of this application is shown;

[0057] Figure 5B A schematic diagram of the astigmatism curves of the optical lenses according to Embodiment 1, Embodiment 2 and Embodiment 3 of this application is shown.

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

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

[0060] Figure 8 This is a schematic diagram of the structure of an optical lens according to Embodiment Six of this application;

[0061] Figure 9A A schematic diagram of the on-axis chromatic aberration curves of the optical lenses according to Embodiments 4, 5 and 6 of this application is shown.

[0062] Figure 9B A schematic diagram of the astigmatism curves of the optical lenses according to Embodiments 4, 5 and 6 of this application is shown.

[0063] Figure 10 This is a schematic diagram of the structure of an optical lens according to Embodiment Seven of this application;

[0064] Figure 11 This is a schematic diagram of the structure of an optical lens according to Embodiment 8 of this application;

[0065] Figure 12 This is a schematic diagram of the structure of an optical lens according to Embodiment Nine of this application;

[0066] Figure 13A A schematic diagram of the on-axis chromatic aberration curves of the optical lenses of Embodiments 7, 8, and 9 according to this application is shown.

[0067] Figure 13B A schematic diagram of the astigmatism curves of the optical lenses according to Embodiments 7, 8 and 9 of this application is shown.

[0068] Figure 14 This is a schematic diagram of the structure of an optical lens according to Embodiment 10 of this application;

[0069] Figure 15This is a schematic diagram of the structure of an optical lens according to Embodiment Eleven of this application;

[0070] Figure 16 This is a schematic diagram of the structure of an optical lens according to Embodiment Twelve of this application;

[0071] Figure 17A A schematic diagram of the on-axis chromatic aberration curves of the optical lenses of Embodiments 10, 11, and 12 according to this application is shown.

[0072] Figure 17B A schematic diagram of the astigmatism curves of the optical lenses according to Embodiments 10, 11, and 12 of this application is shown.

[0073] Figure 18A and Figure 18B The MTF curves and modulation transfer function curves 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] Figure 19A and Figure 19B The MTF curves and modulation transfer function curves 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] Figure 20A and Figure 20B The MTF curves and modulation transfer function curves of the optical imaging lens are shown respectively when L / (T12+T23)=2.02, (EP12+CP1) / (EP23+CP2)=2.43 and (d1s+d2s) / d3s=2.5. Detailed Implementation

[0076] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this 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 terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0078] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not strictly to scale.

[0079] In this paper, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface shape in the paraxial region can be determined according to methods commonly used in the art, such as using the sign of the R value (R refers to the radius of curvature of the paraxial region) to determine concavity or convexity. In this paper, the surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens. For the object-side surface, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; for the image-side surface, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex.

[0080] It should also be understood that the terms "comprising," "including," "having," "containing," 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. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0081] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having a meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formalized sense, unless expressly so specified herein.

[0082] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other. The following embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this application. It should be pointed out that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0083] According to one aspect of this application, such as Figure 1 As shown, one embodiment of this application proposes an optical lens, which may include a lens barrel and a lens group and a spacer assembly housed within the lens barrel; the lens group includes, arranged sequentially along the optical axis from the object side to the image side: 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; the spacer assembly includes a first spacer element placed on the image side of the first lens and in contact with the image side surface of the first lens, a second spacer 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 spacer element placed on the image side of the third lens and in contact with the image side surface of the third lens.

[0084] Specifically, 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] 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; EP12 is the distance between the first spacer element and the second spacer element along the optical axis; CP1 is the maximum thickness of the first spacer element; EP23 is the distance between the second spacer element and the third spacer element along the optical axis; CP2 is the maximum thickness of the second spacer element; d1s is the object-side inner diameter of the first spacer element; d2s is the object-side inner diameter of the second spacer element; and d3s is the object-side inner diameter of the third spacer 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 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 more sensitive to the peripheral field of view, which will have a greater impact on the field curvature of the 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 post - assembly bearing, 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 - collecting 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 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.

[0091] Exemplarily, Figure 18A and Figure 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; Figure 19A and Figure 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; Figure 20A and Figure 20BThe MTF and modulation transfer function curves 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 figures that: Figure 18A and Figure 18B As shown, when the relation (EP12+CP1) / (EP23+CP2) is greater than 1.45 and less than 2.35, and the relation (d1s+d2s) / d3s is greater than 2.05 and less than 2.25, the air gap of the optical lens has a small impact on the field curvature, resulting in good MTF performance of the optical lens; Figure 19A and Figure 19B As shown, when the relation (EP12+CP1) / (EP23+CP2) is less than 1.45 and the relation (d1s+d2s) / d3s is less than 2.05, the optical lens exhibits a significant positive field region, resulting in a slight decrease in the MTF performance of the optical lens and failing to meet imaging requirements; for example... Figure 20A and Figure 20B As shown, when the relation (EP12+CP1) / (EP23+CP2) is greater than 2.35 and the relation (d1s+d2s) / d3s is greater than 2.25, the air gap of the optical lens is obviously poor, which leads to a serious decrease in the MTF performance of the optical lens and fails 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 this 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 element satisfies: 6.25 mm < ∑CP1 + ∑CP2 < 8.15 mm; where ∑CP1 is the sum of the maximum thicknesses of all spacer elements between the first lens and the second lens; and ∑CP2 is the sum of the maximum thicknesses of all spacer elements between the second lens and the third lens.

[0094] Thus, the optical lens of this application not only provides better support for the lens by setting 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 by the relationship 6.25mm<∑CP1+∑CP2<8.15mm, so as to reduce the lens size 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 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.

[0097] Thus, since d1cs is the minimum aperture through which light is allowed to pass through the object side surface of the second lens, it determines the range of light that the lens can capture, and thus affects the imaging field of view and brightness. And 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 transmission aperture on the front surface to maximize the light collection ability, while reducing unnecessary stray light or achieving specific beam constraints by reducing the rear aperture.

[0098] Preferably, 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: 0.38 ≤ 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] Thus, 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, facilitate ensuring the compactness and compatibility of the entire system, and thus ensure the magnification effect of the entire lens on light or images under specific conditions.

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

[0102] According to some embodiments of this application, the distance EP01 from the object-side end face of the lens barrel to the object-side surface of the first spacer element along the optical axis satisfies the following condition: 1.95. <EP01 / CT1<5.15。

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

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

[0105] According to some embodiments of this 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] Thus, since the difference between the inner and outer diameters on the object side of the second spacer element represents the portion of the lens edge that extends beyond the light-transmitting aperture of its second surface, reflecting the extra edge width designed for the lens for installation and protection, this application ensures that the second lens will not block too much of the light transmitted from the first lens during installation by constraining the above relationship 1.05 < (D2s - d2s) / d1m < 1.80.

[0107] Preferably, 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: 1.10≤(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, by setting the proportional relationship among 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, the optical lens of the present application accurately controls the air gap between the first lens and the second lens within a reasonable range, so as to ensure the smooth transition of light between the lenses, reduce the scattering and loss of light, and thus improve 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 deformation of the lens 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, by controlling the relational expression 5.20 mm < d3s / (f3 / R5) < 7.0 mm, the optical lens of the present application can control the focusing or diverging characteristics of the lens on light; 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 spacer element, the effective focal length f3 of the third lens, and the object-side radius of curvature R5 of the third lens satisfy: 5.24mm≤d3s / (f3 / R5)≤6.95mm.

[0114] According to some embodiments of this 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; the spacing distance EP12 between the first spacing element and the second spacing element along the optical axis and the maximum thickness CP1b of the first auxiliary spacing element satisfy: 1.35 <EP12 / CP1b<1.70。

[0115] Thus, by introducing a first auxiliary spacer element and precisely controlling its maximum thickness, the optical lens of this application helps to ensure a smooth transition and tight fit between the first spacer element and the second spacer element. This 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 gaps.

[0116] Preferably, the spacing 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: 1.37≤EP12 / CP1b≤1.69.

[0117] According to some embodiments of this application, the object-side surface and the image-side surface of the first lens are convex and concave, respectively; the object-side radius of curvature R1 of the first lens, the image-side radius of curvature 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 this application, through the relationship 1.20 < (R1 + R2) / d1s < 1.75, can ensure that the first lens has a good light-gathering effect while also ensuring a strong refractive ability; while the object-side inner diameter d1s of the first spacer element limits the amount of light passing through. In other words, the optical lens of this application, through the control of the relationship 1.20 < (R1 + R2) / d1s < 1.75, can ensure a balance between the lens's focal length, aberration correction, and relative illumination.

[0119] Preferably, the object-side radius of curvature R1 of the first lens, the image-side radius of curvature 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 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.

[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 near - scene monitoring, making the monitoring of the near - by scene clearer and ensuring better display of objects such as human faces that need to be monitored within the monitoring range; 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 more compact, and thus the size of the entire surveillance camera can be reduced, 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 - time auxiliary spacer element disposed on the image of 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 - time auxiliary spacer element, the inner diameter d1cs of the object side of the first - time auxiliary 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 - time auxiliary spacer element and the second spacer element, the optical lens of the present application can ensure the effective light - blocking area of the first - time auxiliary spacer element and the second spacer element, and reasonably setting the effective light - blocking area of the first - time auxiliary spacer element and the effective light - blocking area of the second lens can effectively block the excess light refracted through 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 this application, the optical lens satisfies: 1.01≤EB34 / (CT3+CT4)≤1.10; where EB34 is the distance along the optical axis from the side closest to the object of the structural region of the third lens to the side closest to the image of the structural region of the fourth lens; CT3 is the center thickness of the third lens; and CT4 is the center thickness of the fourth lens.

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

[0128] It is worth mentioning that, according to another aspect of this application, another embodiment of this application provides an optical lens, which may include a lens barrel and a lens group and a spacer assembly housed within the lens barrel; the lens group includes, arranged sequentially along the optical axis from the object side to the image side: 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; 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 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; and the object side surface and the image side surface of the fourth lens are both 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 on the optical axis between the first lens and the second lens; T23 is the air gap on the optical axis between the second lens and the third lens; 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 on the optical axis between the third lens and the fourth lens; and CP3 is the maximum thickness of the third spacer element.

[0130] It should be noted that from the relationship 1.85 < L / (T12 + T23) < 2.75, it can be seen that the proportion of the air gaps on the optical axis between the first lens and the second lens and between the second lens and the third lens 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, it balances the lens focal lengths and the intervals to ensure the performance stability after assembly.

[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 on the optical axis between the third lens and the fourth lens; 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 axial distance EP01 along the optical axis from the object-side end face of the lens barrel to the object-side surface 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 axial distance EP01 along the optical axis from the object-side end face of the lens barrel to the object-side surface 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 solutions 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 thereto. 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] The following describes some specific, non-limiting embodiments of the above-described embodiments of this application in more detail with reference to the accompanying drawings. For ease of description, in the following embodiments, OBJ represents the object plane of the optical lens, STO represents the surface of the aperture stop, S1 represents the object-side plane of the first lens E1, S2 represents the image-side plane of the first lens E1, S3 represents the object-side plane of the second lens E2, S4 represents the image-side plane of the second lens E2, S5 represents the object-side plane of the third lens E3, S6 represents the image-side plane of the third lens E3, S7 represents the object-side plane of the fourth lens E4, and S8 represents the image-side plane of the fourth lens E4. Furthermore, Aj represents the j-th order aspherical coefficient, j = 4, 6, 8, 10, 12, 14, 16.

[0142] Example 1

[0143] like Figure 2 As shown, in this embodiment, the optical lens includes a lens barrel P0 and a lens group and a spacer assembly housed within 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 sequentially along the optical axis from the object side to the image side; the spacer assembly includes a first spacer 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 spacer 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 spacer 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 assembly further includes a first auxiliary spacing element P1b disposed on the image side of the first spacing element P1 and in contact with the image side of the first spacing element P1, a first auxiliary spacing element P1c disposed on the image side of the first auxiliary spacing element P1b and in contact with the image side of the first auxiliary spacing element P1b, a second auxiliary spacing element P2b disposed on the image side of the second spacing element P2 and in contact with the image side of the second spacing element P2, and a second auxiliary spacing element P2c disposed on the image side of the second auxiliary spacing element P2b and in contact with the image side of the second auxiliary spacing element P2b.

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

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

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

[0148]

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

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

[0151]

[0152] Where x is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, and A16 that can be used for each aspherical mirror S1 to S8 in Example 1.

[0153] Table 2: Aspherical coefficients of the optical lens in 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] Example 2

[0156] like Figure 3 As shown, in this embodiment, the optical lens includes a lens barrel P0 and a lens group and a spacer assembly housed within the lens barrel P0; the lens group includes, arranged sequentially along the optical axis from the object side to the image side: a first lens E1 with negative optical power, a second lens E2 with positive optical power, a third lens E3 with positive optical power, and a fourth lens E4 with negative optical power; the spacer assembly includes a first spacer 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 spacer 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 spacer 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.

[0157] In this embodiment, the spacing assembly further includes a first auxiliary spacing element P1b disposed on the image side of the first spacing element P1 and in contact with the image side of the first spacing element P1, a first auxiliary spacing element P1c disposed on the image side of the first auxiliary spacing element P1b and in contact with the image side of the first auxiliary spacing element P1b, a second auxiliary spacing element P2b disposed on the image side of the second spacing element P2 and in contact with the image side of the second spacing element P2, and a second auxiliary spacing element P2c disposed on the image side of the second auxiliary spacing element P2b and in contact with the image side of the second auxiliary spacing element P2b.

[0158] It is worth noting that, compared with Embodiment 1 above, the optical lens of Embodiment 2 has the same white object structure, that is, the basic optical parameter table of the optical lens of Embodiment 2 is the same as Table 1, and the aspherical coefficient table is the same as Table 2. However, the optical lens of Embodiment 2 has a different black object structure than the optical lens of Embodiment 1 above, that is, the difference between Embodiment 2 and Embodiment 1 above lies in the different dimensional values ​​of some structural parameters of the lens barrel and the spacer assembly in the optical lens.

[0159] Specifically, the values ​​of various related structural parameters in this embodiment and the above embodiment are shown in Table 10 below. Multiple black object parameters specifically include: the object-side inner diameter d1s of the first spacer element P1; the image-side inner diameter d1m of the first spacer element P1; the object-side inner diameter d2s of the second spacer element P2; the image-side inner diameter d2m of the second spacer element P2; the object-side outer diameter D2s of the second spacer element P2; the image-side outer diameter D2m of the second spacer element P2; the object-side inner diameter d3s of the third spacer element P3; the object-side outer diameter D3s of the third spacer element P3; the object-side inner diameter d0s of the lens barrel P0; the image-side outer diameter D0m of the lens barrel P0; the distance EP01 between the object-side end face of the lens barrel P0 and the object-side surface of the first spacer element P1 along the optical axis; the maximum thickness CP1 of the first spacer element P1; and the distance between the first spacer element P1 and the second spacer element P2 along the optical axis. The following parameters are considered: distance EP12; maximum thickness CP2 of the second spacer P2; distance EP23 between the second spacer P2 and the third spacer P3 along the optical axis; maximum thickness CP3 of the third spacer P3; maximum height L of the lens barrel P0; maximum thickness CP1b of the first auxiliary spacer P1b; object-side inner diameter d1cs of the first auxiliary spacer P1c; image-side outer diameter D1cm of the first auxiliary spacer P1c; maximum thickness CP1c of the first auxiliary spacer P1c; maximum thickness CP2b of the second auxiliary spacer P2b; distance EP34 between the third spacer P3 and the fourth spacer P4 along the optical axis; sum of maximum thicknesses of all spacers between the first lens E1 and the second lens E2 ∑CP1; sum of maximum thicknesses of all spacers between the second lens E2 and the third lens E3 ∑CP2. It is understood that the units for the values ​​of each parameter shown in Table 10 are millimeters (mm), and the schematic diagrams of each parameter in the optical lens structure diagram are as follows: Figure 1 As shown.

[0160] Example 3

[0161] like Figure 4As shown, in this embodiment, the optical lens includes a lens barrel P0 and a lens group and a spacer assembly housed within the lens barrel P0; the lens group includes, arranged sequentially along the optical axis from the object side to the image side: a first lens E1 with negative optical power, a second lens E2 with positive optical power, a third lens E3 with positive optical power, and a fourth lens E4 with negative optical power; the spacer assembly includes a first spacer 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 spacer 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 spacer 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.

[0162] In this embodiment, the spacing assembly further includes a first auxiliary spacing element P1b disposed on the image side of the first spacing element P1 and in contact with the image side of the first spacing element P1, a first auxiliary spacing element P1c disposed on the image side of the first auxiliary spacing element P1b and in contact with the image side of the first auxiliary spacing element P1b, a second auxiliary spacing element P2b disposed on the image side of the second spacing element P2 and in contact with the image side of the second spacing element P2, and a second auxiliary spacing element P2c disposed on the image side of the second auxiliary spacing element P2b and in contact with the image side of the second auxiliary spacing element P2b.

[0163] It is worth noting that, compared with Embodiment 1 above, the optical lens of Embodiment 3 has the same white object structure, that is, the basic optical parameter table of the optical lens of Embodiment 3 is the same as Table 1, and the aspherical coefficient table is the same as Table 2. However, the optical lens of Embodiment 3 has a different black object structure than the optical lens of Embodiment 1 above. That is, the difference between Embodiment 3 and Embodiment 1 above lies in the different dimensional values ​​of some structural parameters of the lens barrel and the spacer assembly in the optical lens. Specifically, the values ​​of each relevant structural parameter in Embodiment 3 are shown in Table 10 below. The specific descriptions of the multiple black object parameters are the same as those in Embodiment 2 above, and will not be repeated here.

[0164] Simulation tests showed that the on-axis chromatic aberration curves of the optical lenses in Examples 1, 2, and 3 are as follows: Figure 5A As shown, this represents the degree of deviation of the focal point after light of different wavelengths passes through the optical lens; the astigmatism curves of the optical lenses in Embodiments 1, 2, and 3 are shown below. Figure 5B As shown, it represents the curvature of the meridional image plane and the curvature of the sagittal image plane. According to... 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] Example 4

[0166] like Figure 6 As shown, in this embodiment, the optical lens includes a lens barrel P0 and a lens group and a spacer assembly housed within the lens barrel P0; the lens group includes, arranged sequentially along the optical axis from the object side to the image side: a first lens E1 with negative optical power, a second lens E2 with positive optical power, a third lens E3 with positive optical power, and a fourth lens E4 with negative optical power; the spacer assembly includes a first spacer 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 spacer 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 spacer 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.

[0167] In this embodiment, the spacing assembly further includes a first auxiliary spacing element P1b disposed on the image side of the first spacing element P1 and in contact with the image side of the first spacing element P1, a first auxiliary spacing element P1c disposed on the image side of the first auxiliary spacing element P1b and in contact with the image side of the first auxiliary spacing element P1b, a second auxiliary spacing element P2b disposed on the image side of the second spacing element P2 and in contact with the image side of the second spacing element P2, and a second auxiliary spacing element P2c disposed on the image side of the second auxiliary spacing element P2b and in contact with the image side of the second auxiliary spacing element P2b.

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

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

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

[0171]

[0172]

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

[0174] Table 4: Aspherical coefficients of the optical lens in 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] Example 5

[0177] like Figure 7 As shown, in this embodiment, the optical lens includes a lens barrel P0 and a lens group and a spacer assembly housed within the lens barrel P0; the lens group includes, arranged sequentially along the optical axis from the object side to the image side: a first lens E1 with negative optical power, a second lens E2 with positive optical power, a third lens E3 with positive optical power, and a fourth lens E4 with negative optical power; the spacer assembly includes a first spacer 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 spacer 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 spacer 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.

[0178] In this embodiment, the spacing assembly further includes a first auxiliary spacing element P1b disposed on the image side of the first spacing element P1 and in contact with the image side of the first spacing element P1, a first auxiliary spacing element P1c disposed on the image side of the first auxiliary spacing element P1b and in contact with the image side of the first auxiliary spacing element P1b, a second auxiliary spacing element P2b disposed on the image side of the second spacing element P2 and in contact with the image side of the second spacing element P2, and a second auxiliary spacing element P2c disposed on the image side of the second auxiliary spacing element P2b and in contact with the image side of the second auxiliary spacing element P2b.

[0179] It is worth noting that, compared with Embodiment 4 above, the optical lens of Embodiment 5 has the same white object structure, that is, the basic optical parameter table of the optical lens of Embodiment 5 is the same as Table 3, and the aspherical coefficient table is the same as Table 4. However, the optical lens of Embodiment 5 has a different black object structure than the optical lens of Embodiment 4 above. That is, the difference between Embodiment 5 and Embodiment 4 above lies in the different dimensional values ​​of some structural parameters of the lens barrel and the spacer assembly in the optical lens. Specifically, the values ​​of each relevant structural parameter in Embodiment 5 are shown in Table 10 below. The specific descriptions of the multiple black object parameters are the same as those in Embodiment 2 above, and will not be repeated here.

[0180] Example 6

[0181] like Figure 8 As shown, in this embodiment, the optical lens includes a lens barrel P0 and a lens group and a spacer assembly housed within the lens barrel P0; the lens group includes, arranged sequentially along the optical axis from the object side to the image side: a first lens E1 with negative optical power, a second lens E2 with positive optical power, a third lens E3 with positive optical power, and a fourth lens E4 with negative optical power; the spacer assembly includes a first spacer 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 spacer 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 spacer 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.

[0182] In this embodiment, the spacing assembly further includes a first auxiliary spacing element P1b disposed on the image side of the first spacing element P1 and in contact with the image side of the first spacing element P1, a first auxiliary spacing element P1c disposed on the image side of the first auxiliary spacing element P1b and in contact with the image side of the first auxiliary spacing element P1b, a second auxiliary spacing element P2b disposed on the image side of the second spacing element P2 and in contact with the image side of the second spacing element P2, and a second auxiliary spacing element P2c disposed on the image side of the second auxiliary spacing element P2b and in contact with the image side of the second auxiliary spacing element P2b.

[0183] It is worth noting that, compared with Embodiment 4 above, the optical lens of Embodiment 6 has the same white object structure, that is, the basic optical parameter table of the optical lens of Embodiment 6 is the same as Table 3, and the aspherical coefficient table is the same as Table 4. However, the optical lens of Embodiment 6 has a different black object structure than the optical lens of Embodiment 4 above. That is, the difference between Embodiment 6 and Embodiment 4 above lies in the different dimensional values ​​of some structural parameters of the lens barrel and the spacer assembly in the optical lens. Specifically, the values ​​of each relevant structural parameter in Embodiment 6 are shown in Table 10 below. The specific descriptions of the multiple black object parameters are the same as those in Embodiment 2 above, and will not be repeated here.

[0184] Simulation tests showed that the on-axis chromatic aberration curves of the optical lenses in Examples 4, 5, and 6 are as follows: Figure 9A As shown, this indicates the degree of deviation of the focal point after light of different wavelengths passes through the optical lens; the astigmatism curves of the optical lenses in Examples 4, 5, and 6 are shown below. Figure 9B As shown, it represents the curvature of the meridional image plane and the curvature of the sagittal image plane. According to... Figure 9A and Figure 9B It can be seen that the optical lenses in Embodiments 4, 5 and 6 can all achieve good imaging quality.

[0185] Example 7

[0186] like Figure 10 As shown, in this embodiment, the optical lens includes a lens barrel P0 and a lens group and a spacer assembly housed within the lens barrel P0; the lens group includes, arranged sequentially along the optical axis from the object side to the image side: a first lens E1 with negative optical power, a second lens E2 with positive optical power, a third lens E3 with positive optical power, and a fourth lens E4 with negative optical power; the spacer assembly includes a first spacer 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 spacer 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 spacer 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.

[0187] In this embodiment, the spacing assembly further includes a first auxiliary spacing element P1b disposed on the image side of the first spacing element P1 and in contact with the image side of the first spacing element P1, a first auxiliary spacing element P1c disposed on the image side of the first auxiliary spacing element P1b and in contact with the image side of the first auxiliary spacing element P1b, a second auxiliary spacing element P2b disposed on the image side of the second spacing element P2 and in contact with the image side of the second spacing element P2, and a second auxiliary spacing element P2c disposed on the image side of the second auxiliary spacing element P2b and in contact with the image side of the second auxiliary spacing element P2b.

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

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

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

[0191]

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

[0193] Table 6: Aspherical coefficient table of the optical lens in 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] Example 8

[0196] like Figure 11As shown, in this embodiment, the optical lens includes a lens barrel P0 and a lens group and a spacer assembly housed within the lens barrel P0; the lens group includes, arranged sequentially along the optical axis from the object side to the image side: a first lens E1 with negative optical power, a second lens E2 with positive optical power, a third lens E3 with positive optical power, and a fourth lens E4 with negative optical power; the spacer assembly includes a first spacer 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 spacer 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 spacer 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.

[0197] In this embodiment, the spacing assembly further includes a first auxiliary spacing element P1b disposed on the image side of the first spacing element P1 and in contact with the image side of the first spacing element P1, a first auxiliary spacing element P1c disposed on the image side of the first auxiliary spacing element P1b and in contact with the image side of the first auxiliary spacing element P1b, a second auxiliary spacing element P2b disposed on the image side of the second spacing element P2 and in contact with the image side of the second spacing element P2, and a second auxiliary spacing element P2c disposed on the image side of the second auxiliary spacing element P2b and in contact with the image side of the second auxiliary spacing element P2b.

[0198] It is worth noting that, compared with Embodiment 7 above, the optical lens of Embodiment 8 has the same white object structure, that is, the basic optical parameter table of the optical lens of Embodiment 8 is the same as Table 5, and the aspherical coefficient table is the same as Table 6. However, the optical lens of Embodiment 8 has a different black object structure than the optical lens of Embodiment 7 above. That is, the difference between Embodiment 8 and Embodiment 7 above is that the dimensional values ​​of some structural parameters of the lens barrel and the spacer assembly in the optical lens are different. Specifically, the values ​​of each relevant structural parameter in Embodiment 8 are shown in Table 10 below. The specific descriptions of the multiple black object parameters are the same as those in Embodiment 2 above, and will not be repeated here.

[0199] Example 9

[0200] like Figure 12As shown, in this embodiment, the optical lens includes a lens barrel P0 and a lens group and a spacer assembly housed within the lens barrel P0; the lens group includes, arranged sequentially along the optical axis from the object side to the image side: a first lens E1 with negative optical power, a second lens E2 with positive optical power, a third lens E3 with positive optical power, and a fourth lens E4 with negative optical power; the spacer assembly includes a first spacer 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 spacer 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 spacer 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.

[0201] In this embodiment, the spacing assembly further includes a first auxiliary spacing element P1b disposed on the image side of the first spacing element P1 and in contact with the image side of the first spacing element P1, a first auxiliary spacing element P1c disposed on the image side of the first auxiliary spacing element P1b and in contact with the image side of the first auxiliary spacing element P1b, a second auxiliary spacing element P2b disposed on the image side of the second spacing element P2 and in contact with the image side of the second spacing element P2, and a second auxiliary spacing element P2c disposed on the image side of the second auxiliary spacing element P2b and in contact with the image side of the second auxiliary spacing element P2b.

[0202] It is worth noting that, compared with Embodiment 7 above, the optical lens of Embodiment 9 has the same white object structure, that is, the basic optical parameter table of the optical lens of Embodiment 9 is the same as Table 5, and the aspherical coefficient table is the same as Table 6. However, the optical lens of Embodiment 9 has a different black object structure than the optical lens of Embodiment 7 above. That is, the difference between Embodiment 9 and Embodiment 7 is that the dimensional values ​​of some structural parameters of the lens barrel and the spacer assembly in the optical lens are different. Specifically, the values ​​of each relevant structural parameter in Embodiment 9 are shown in Table 10 below. The specific descriptions of the multiple black object parameters are the same as those in Embodiment 2 above, and will not be repeated here.

[0203] Simulation tests showed that the on-axis chromatic aberration curves of the optical lenses in Examples 7, 8, and 9 are as follows: Figure 13A As shown, this indicates the degree of deviation of the focal point after light of different wavelengths passes through the optical lens; the astigmatism curves of the optical lenses in Embodiments 7, 8, and 9 are shown below. Figure 13B As shown, it represents the curvature of the meridional image plane and the curvature of the sagittal image plane. According to... Figure 13A and Figure 13B It can be seen that the optical lenses in Embodiments 7, 8 and 9 can all achieve good imaging quality.

[0204] Example 10

[0205] like Figure 14 As shown, in this embodiment, the optical lens includes a lens barrel P0 and a lens group and a spacer assembly housed within the lens barrel P0; the lens group includes, arranged sequentially along the optical axis from the object side to the image side: a first lens E1 with negative optical power, a second lens E2 with positive optical power, a third lens E3 with positive optical power, and a fourth lens E4 with negative optical power; the spacer assembly includes a first spacer 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 spacer 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 spacer 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.

[0206] In this embodiment, the spacing assembly further includes a first auxiliary spacing element P1b disposed on the image side of the first spacing element P1 and in contact with the image side of the first spacing element P1, a first auxiliary spacing element P1c disposed on the image side of the first auxiliary spacing element P1b and in contact with the image side of the first auxiliary spacing element P1b, a second auxiliary spacing element P2b disposed on the image side of the second spacing element P2 and in contact with the image side of the second spacing element P2, and a second auxiliary spacing element P2c disposed on the image side of the second auxiliary spacing element P2b and in contact with the image side of the second auxiliary spacing element P2b.

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

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

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

[0210]

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

[0212] Table 8: Aspherical coefficient table of the optical lens in 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] Example 11

[0215] like Figure 15 As shown, in this embodiment, the optical lens includes a lens barrel P0 and a lens group and a spacer assembly housed within the lens barrel P0; the lens group includes, arranged sequentially along the optical axis from the object side to the image side: a first lens E1 with negative optical power, a second lens E2 with positive optical power, a third lens E3 with positive optical power, and a fourth lens E4 with negative optical power; the spacer assembly includes a first spacer 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 spacer 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 spacer 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.

[0216] In this embodiment, the spacing assembly further includes a first auxiliary spacing element P1b disposed on the image side of the first spacing element P1 and in contact with the image side of the first spacing element P1, a first auxiliary spacing element P1c disposed on the image side of the first auxiliary spacing element P1b and in contact with the image side of the first auxiliary spacing element P1b, a second auxiliary spacing element P2b disposed on the image side of the second spacing element P2 and in contact with the image side of the second spacing element P2, and a second auxiliary spacing element P2c disposed on the image side of the second auxiliary spacing element P2b and in contact with the image side of the second auxiliary spacing element P2b.

[0217] It is worth noting that, compared with Embodiment 10 above, the optical lens of Embodiment 11 has the same white object structure, that is, the basic optical parameter table of the optical lens of Embodiment 11 is the same as Table 7, and the aspherical coefficient table is the same as Table 8. However, the optical lens of Embodiment 11 has a different black object structure than the optical lens of Embodiment 10 above. That is, the difference between Embodiment 11 and Embodiment 10 above is that the dimensional values ​​of some structural parameters of the lens barrel and the spacer assembly in the optical lens are different. Specifically, the values ​​of each relevant structural parameter in Embodiment 11 are shown in Table 10 below. The specific descriptions of the multiple black object parameters are the same as those in Embodiment 2 above, and will not be repeated here.

[0218] Example 12

[0219] like Figure 16 As shown, in this embodiment, the optical lens includes a lens barrel P0 and a lens group and a spacer assembly housed within the lens barrel P0; the lens group includes, arranged sequentially along the optical axis from the object side to the image side: a first lens E1 with negative optical power, a second lens E2 with positive optical power, a third lens E3 with positive optical power, and a fourth lens E4 with negative optical power; the spacer assembly includes a first spacer 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 spacer 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 spacer 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.

[0220] In this embodiment, the spacing assembly further includes a first auxiliary spacing element P1b disposed on the image side of the first spacing element P1 and in contact with the image side of the first spacing element P1, a first auxiliary spacing element P1c disposed on the image side of the first auxiliary spacing element P1b and in contact with the image side of the first auxiliary spacing element P1b, a second auxiliary spacing element P2b disposed on the image side of the second spacing element P2 and in contact with the image side of the second spacing element P2, and a second auxiliary spacing element P2c disposed on the image side of the second auxiliary spacing element P2b and in contact with the image side of the second auxiliary spacing element P2b.

[0221] It is worth noting that, compared with Embodiment 10 above, the optical lens of Embodiment 12 has the same white object structure, that is, the basic optical parameter table of the optical lens of Embodiment 12 is the same as Table 7, and the aspherical coefficient table is the same as Table 8. However, the optical lens of Embodiment 12 has a different black object structure than the optical lens of Embodiment 10 above. That is, the difference between Embodiment 12 and Embodiment 10 above is that the dimensional values ​​of some structural parameters of the lens barrel and the spacer assembly in the optical lens are different. Specifically, the values ​​of each relevant structural parameter in Embodiment 12 are shown in Table 10 below. The specific descriptions of the multiple black object parameters are the same as those in Embodiment 2 above, and will not be repeated here.

[0222] Simulation tests showed that the on-axis chromatic aberration curves of the optical lenses in Examples 10, 11, and 12 were as follows: Figure 17A As shown, this indicates the degree of deviation of the focal point after light of different wavelengths passes through the optical lens; the astigmatism curves of the optical lenses in Examples 10, 11, and 12 are shown below. Figure 17B As shown, it represents the curvature of the meridional image plane and the curvature of the sagittal image plane. According to... Figure 17A and Figure 17B It can be seen that the optical lenses in Embodiments 10, 11 and 12 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 shown in Table 9 below.

[0224] Table 9: System Optical Parameters of Optical Lenses

[0225]

[0226]

[0227] Furthermore, the black object structure parameters of the optical lenses in Examples 1 to 12 are shown in Table 10.

[0228] Table 10: Black Object Structure Parameters of Optical Lenses

[0229]

[0230] In summary, the optical lenses in Examples 1 to 12 satisfy the relationships shown in Table 11, as detailed in Table 11.

[0231] Table 11: Relationships Satisfied by Optical Lenses

[0232]

[0233]

[0234] It is worth mentioning that, according to one aspect of this application, one embodiment of this application further provides a camera module, which may include the aforementioned optical lens and a photosensitive element, the photosensitive element being disposed on the image side of the optical lens for imaging. It is understood that the photosensitive element mentioned in this application may, but is not limited to, be implemented as a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS) device, and this application will not elaborate further on this.

[0235] Furthermore, according to another aspect of this application, one embodiment of this application provides an electronic device that may include a camera module and a processor as described above. 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 this application may, but is not limited to, a device such as a mobile phone equipped with the camera module, and this application will not elaborate further on this.

[0236] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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 merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An optical lens, characterized in that, include: A lens barrel and a lens assembly and a spacer assembly housed within the lens barrel; the lens assembly includes, arranged sequentially along the optical axis from the object side to the image side: 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; the spacer assembly includes a first spacer element positioned on the image side of the first lens and in contact with the image side surface of the first lens, a second spacer element positioned 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 positioned 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; 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; EP12 is the distance between the first spacer element and the second spacer element along the optical axis; CP1 is the maximum thickness of the first spacer element; EP23 is the distance between the second spacer element and the third spacer element along the optical axis; CP2 is the maximum thickness of the second spacer element; d1s is the object-side inner diameter of the first spacer element; d2s is the object-side inner diameter of the second spacer element; and d3s is the object-side inner diameter of the third spacer element.

2. The optical lens according to claim 1, characterized in that, 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: 6.25mm<∑CP1+∑CP2<8.15mm; 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.

3. The optical lens according to claim 1, characterized in that, 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 object-side inner diameter d1cs of the first auxiliary spacing element, the image-side outer diameter D2m of the second spacing element, and the image-side inner diameter d2m of the second spacing 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 radius of curvature R4 of the second lens satisfy the following: -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 face of the lens barrel to the object-side surface of the first spacer element along the optical axis satisfies the following condition: 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; where, 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 in the optical axis direction 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; where, f is the effective focal length of the optical lens; Semi-FOV is half of the maximum field 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 satisfies: 1.01≤EB34 / (CT3+CT4)≤1.10; Wherein, EB34 is the distance along the optical axis from the side closest to the object of the structural region of the third lens to the side closest to the image of the structural region of the fourth lens; CT3 is the center thickness of the third lens; and CT4 is the center thickness of the fourth lens.

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