Optical lens

Abstract

The present application discloses an optical lens. The optical lens comprises a lens set, at least one spacer, and a lens barrel for accommodating the lens set and the spacer. The lens set comprises, in order from the object side to the image side along the optical axis, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, wherein any two adjacent lenses among the first lens to the fifth lens have an air gap on the optical axis, the first lens to the fifth lens all have a center thickness on the optical axis, and the center thickness of the fourth lens on the optical axis is the largest. The lens barrel has an object side end facing the object side and an image side end facing the image side. The optical lens satisfies: 0 < (CT4+CT5+T45) x tan(FOV / 4) / d0m < 2, CT4 is the center thickness of the fourth lens on the optical axis, CT5 is the center thickness of the fifth lens on the optical axis, T45 is the air gap of the fourth lens and the fifth lens on the optical axis, FOV is the maximum field of view angle of the optical lens, and d0m is the inner diameter of the image side end of the lens barrel.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical elements, and in particular, to an optical lens. BACKGROUND

[0002] With the application of photography technology in different scenes more and more, consumers have higher and higher requirements for electronic devices with photography function. In order to cater to the needs of consumers, many lens manufacturers have begun to develop optical lenses with characteristics such as miniaturization, large field of view, etc. However, most of the current large field of view lenses usually have the problem of large air gap between the two lenses close to the imaging surface, and such lens architecture is prone to cause poor assembly stability of the lens. SUMMARY

[0003] In one aspect, the present application provides an optical lens including, in order from an object side to an image side along an optical axis, a lens group, at least one spacer, and a lens barrel for accommodating the lens group and the spacer. The lens group includes, in order from the object side to the image side along the optical axis, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. Any two adjacent lenses among the first lens to the fifth lens have an air gap on the optical axis. The first lens to the fifth lens each have a center thickness on the optical axis, and the center thickness of the fourth lens on the optical axis is the largest. The lens barrel has an object side end facing the object side and an image side end facing the image side. The optical lens satisfies 0 < (CT4 + CT5 + T45) x tan(FOV / 4) / d0m < 2, CT4 is the center thickness of the fourth lens on the optical axis, CT5 is the center thickness of the fifth lens on the optical axis, T45 is the air gap of the fourth lens and the fifth lens on the optical axis, FOV is the maximum field of view of the optical lens, and d0m is the inner diameter of the image side end of the lens barrel.

[0004] In one embodiment, at least one of the mirror surfaces from the object side surface of the first lens to the image side surface of the fifth lens is a non-spherical mirror surface.

[0005] In one embodiment, the at least one spacer includes a first spacer located on the image side of the first lens and in partial contact with the image side surface of the first lens, wherein the first lens has a positive focal power, the second lens has a negative focal power, and the optical lens satisfies -2 < D1m / (f1 + f2) < 0, D1m is the outer diameter of the image side surface of the first spacer, f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens.

[0006] In one embodiment, the at least one spacer includes: a first spacer located on the image side of the first lens and partially in contact with the image side surface of the first lens; and a second spacer located on the image side of the second lens and partially in contact with the image side surface of the second lens, wherein the optical lens can satisfy: 0 < EP12 / (T12+T23) < 1, EP12 is a separation distance of the image side surface of the first spacer to the object side surface of the second spacer in the direction along the optical axis, T12 is an air separation of the first lens and the second lens in the optical axis, and T23 is an air separation of the second lens and the third lens in the optical axis.

[0007] In one embodiment, the at least one spacer includes: a first spacer located on the image side of the first lens and partially in contact with the image side surface of the first lens; and a second spacer located on the image side of the second lens and partially in contact with the image side surface of the second lens, wherein the object side surface of the second lens is a concave surface; and the optical lens can satisfy: -10 < (R1+R3) / (EP01+EP12) < 0, R1 is a radius of curvature of the object side surface of the first lens, R3 is a radius of curvature of the object side surface of the second lens, EP01 is a separation distance of the object side end of the lens barrel to the object side surface of the first spacer in the direction along the optical axis, and EP12 is a separation distance of the image side surface of the first spacer to the object side surface of the second spacer in the direction along the optical axis.

[0008] In one embodiment, the at least one spacer includes: a first spacer located on the image side of the first lens and partially in contact with the image side surface of the first lens; a second spacer located on the image side of the second lens and partially in contact with the image side surface of the second lens; and a third spacer located on the image side of the third lens and partially in contact with the image side surface of the third lens, wherein the optical lens can satisfy: V2 / EP12 < V1 / EP01 < V2 / EP12+V3 / EP23 and V3 / EP23 < V1 / EP01 < V2 / EP12+V3 / EP23, V2 is an Abbe number of the second lens, EP12 is a separation distance of the image side surface of the first spacer to the object side surface of the second spacer in the direction along the optical axis, V3 is an Abbe number of the third lens, EP23 is a separation distance of the image side surface of the second spacer to the object side surface of the third spacer in the direction along the optical axis, V1 is an Abbe number of the first lens, and EP01 is a separation distance of the object side end of the lens barrel to the object side surface of the first spacer in the direction along the optical axis.

[0009] In one embodiment, the at least one spacer includes: a first spacer located on the image side of the first lens and partially in contact with the image side surface of the first lens; and a third spacer located on the image side of the third lens and partially in contact with the image side surface of the third lens, wherein the optical lens can satisfy: 20 < (|f3| - f1) / (d3s - d1s) < 40, f3 is the effective focal length of the third lens, f1 is the effective focal length of the first lens, d3s is the inner diameter of the object side surface of the third spacer, and d1s is the inner diameter of the object side surface of the first spacer.

[0010] In one embodiment, the at least one spacer includes a third spacer located on the image side of the third lens and partially in contact with the image side surface of the third lens, wherein the optical lens can satisfy: 7 < d3m x Fno / T34 < 15, d3m is the inner diameter of the image side surface of the third spacer, Fno is the F number of the optical lens, and T34 is the air separation of the third lens and the fourth lens on the optical axis.

[0011] In one embodiment, the at least one spacer includes: a third spacer located on the image side of the third lens and partially in contact with the image side surface of the third lens; and a fourth spacer located on the image side of the fourth lens and partially in contact with the image side surface of the fourth lens, wherein the optical lens can satisfy: 2 < L / (CT4 + EP34) < 5, L is the maximum height of the lens barrel, CT4 is the center thickness of the fourth lens on the optical axis, and EP34 is the separation distance of the image side surface of the third spacer to the object side surface of the fourth spacer in the direction along the optical axis.

[0012] In one embodiment, the at least one spacer includes: a third spacer located on the image side of the third lens and partially in contact with the image side surface of the third lens; and a fourth spacer located on the image side of the fourth lens and partially in contact with the image side surface of the fourth lens, wherein the optical lens can satisfy: -4 < R8 / (EP34 + CP3) < -1, R8 is the radius of curvature of the image side surface of the fourth lens, EP34 is the separation distance of the image side surface of the third spacer to the object side surface of the fourth spacer in the direction along the optical axis, and CP3 is the maximum thickness of the third spacer.

[0013] In one embodiment, the at least one spacer includes: a third spacer located on the image side of the third lens and partially in contact with the image side surface of the third lens; and a fourth spacer located on the image side of the fourth lens and partially in contact with the image side surface of the fourth lens, wherein the fourth lens has a positive refractive power; and the optical lens can satisfy: 3 < f4 / EP34 < 11, f4 is the effective focal length of the fourth lens, and EP34 is the separation distance of the image side surface of the third spacer to the object side surface of the fourth spacer in the direction along the optical axis.

[0014] In one embodiment, the at least one spacer includes a fourth spacer located on the image side of the fourth lens and in contact with the image side surface of the fourth lens, and the optical lens satisfies 1 < f / (d0m-d4s) < 2, d0m is the inner diameter of the image side end of the lens barrel, d4s is the inner diameter of the object side surface of the fourth spacer, and f is the total effective focal length of the optical lens.

[0015] In one embodiment, the object side surface of the first lens is convex, and the optical lens satisfies 5 < f x tan(FOV / 2) x D0m / (d0s x R1) < 8, f is the total effective focal length of the optical lens, FOV is the maximum field of view angle of the optical lens, D0m is the outer diameter of the image side end of the lens barrel, d0s is the inner diameter of the object side end of the lens barrel, and R1 is the radius of curvature of the object side surface of the first lens.

[0016] In one embodiment, the object side surface of the first lens is convex, and the optical lens satisfies 5 < f x tan(FOV / 2) x D0m / (d0s x R1) < 8, f is the total effective focal length of the optical lens, FOV is the maximum field of view angle of the optical lens, D0m is the outer diameter of the image side end of the lens barrel, d0s is the inner diameter of the object side end of the lens barrel, and R1 is the radius of curvature of the object side surface of the first lens.

[0017] Generally, in a five-piece ultra-thin lens, by reasonably setting the five lenses, the spacers, and the lens barrel, the optical lens can have the characteristics of miniaturization and large field of view angle, but generally such a lens will be affected by the large rear two lenses, thereby affecting the overall assembly stability of the lens.

[0018] Therefore, the present application provides an optical lens. By reasonably setting the relationship between the air gaps between the lenses in the optical lens and the center thicknesses of the lenses, and limiting 0 < (CT4+CT5+T45) x tan(FOV / 4) / d0m < 2, the fourth lens and the fifth lens can have a high molding yield and will not be cracked in the case of each lens being suspended during assembly, and the assembly stability of the rear end part (such as the fourth lens and the fifth lens part) of the optical lens can be ensured to be high. BRIEF DESCRIPTION OF DRAWINGS

[0019] Other features, objects, and advantages of the present application will become more apparent from the following detailed description when read in conjunction with the accompanying drawings:

[0020] Figures 1A-1C are structural schematic diagrams of optical lenses in three implementation manners in Example 1, respectively;

[0021] Figures 2A-2D show axial chromatic aberration curves, astigmatism curves, distortion curves, and lateral chromatic aberration curves of the optical lenses of Example 1, respectively;

[0022] Figures 3A-3C are structural schematic diagrams of optical lenses in three implementation manners in Example 2, respectively;

[0023] Figures 4A-4D show axial chromatic aberration curves, astigmatism curves, distortion curves, and lateral chromatic aberration curves of the optical lenses of Example 2, respectively;

[0024] Figures 5A-5C are structural schematic diagrams of optical lenses in three implementation manners in Example 3, respectively;

[0025] Figures 6A-6D show axial chromatic aberration curves, astigmatism curves, distortion curves, and lateral chromatic aberration curves of the optical lenses of Example 3, respectively; and

[0026] Figure 7 is a partial parameter schematic diagram of an optical lens according to an embodiment of the present application. DETAILED DESCRIPTION

[0027] For a better understanding of the present application, various aspects of the present application will be described in more detail below with reference to the accompanying drawings. It is to be understood that the following detailed description is merely descriptive of exemplary embodiments of the present application and not limiting thereof in any manner. Throughout the specification, like reference numerals refer to like elements. The expression “and / or” includes any and all combinations of one or more of the associated listed items.

[0028] It should be noted that, in the present specification, the expressions first, second, third, and the like are merely used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, the first lens discussed below can also be referred to as the second lens or the third lens, and the first spacer can also be referred to as the second spacer or the third spacer, without departing from the teachings of the present application.

[0029] In the drawings, the thickness, size, and shape of the lenses have been exaggerated slightly for ease of explanation. Specifically, the shape of the spherical or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale. It should be understood that the thickness, size, and shape of the spacers and the lens barrel have also been exaggerated slightly in the drawings for ease of explanation.

[0030] In this document, the paraxial region refers to a region near the optical axis. If a lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the image plane is referred to as the image side surface of the lens. It should be understood that the surface of each spacer closest to the object is referred to as the object side surface of the spacer, and the surface of each spacer closest to the image plane is referred to as the image side surface of the spacer. The surface of the lens barrel closest to the object is referred to as the object side end of the lens barrel, and the surface of the lens barrel closest to the image plane is referred to as the image side end of the lens barrel.

[0031] It should also be understood that the use of the terms "including", "comprising", "having" "with" and / or "contains", when used in this specification, specify the presence of stated features, elements and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or groups thereof. In addition, when expressions such as "at least one of" appear after a list of items, it modifies the entire list of items and does not modify the individual items in the list. Furthermore, when describing embodiments of the present application, the use of "may" means "one or more embodiments of the present application". Also, the term "exemplary" is intended to mean an example or an illustration.

[0032] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0033] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other in the case of no conflict. The following embodiments only express several implementation manners of the present application, which are described in a more specific and detailed manner, but can not be understood as a limitation on the patent scope of the present application. It should be noted that, for those skilled in the art, some modifications and improvements can be made without departing from the concept of the present application, which are within the protection scope of the present application. For example, the lens group (i.e. the first lens to the fifth lens), the barrel structure and the spacer in each embodiment of the present application can be combined arbitrarily, and are not limited to the combination of the lens group, the barrel structure, the spacer and the like in the embodiment. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0034] The features, principles and other aspects of the present application are described in detail below.

[0035] The optical lens according to the exemplary embodiments of the present application can include five lenses with optical power, which are a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The five lenses are arranged in order along an optical axis from an object side to an image side. Any two adjacent lenses among the first lens to the fifth lens can have a spacer distance. Any lens among the first lens to the fifth lens can have a center thickness on the optical axis.

[0036] According to the exemplary embodiments of the present application, the first lens to the fifth lens can each have an optical region for optical imaging and a non-optical region extending outward from the periphery of the optical region. Generally, the optical region refers to the region of the lens for optical imaging, and the non-optical region refers to the structural region of the lens. In the assembly process of the optical lens, a spacer can be arranged at the non-optical region of each lens by a process such as point bonding, and each lens is coupled into the barrel, respectively. In the imaging process of the optical lens, the optical region of each lens can transmit light from the object to form an optical path and form the final optical image; and the non-optical region of each lens after assembly is accommodated in the barrel which cannot transmit light, so that the non-optical region does not directly participate in the imaging process of the optical lens. It should be noted that, for the convenience of description, the present application divides each lens into two parts of the optical region and the non-optical region for description, but it should be understood that the optical region and the non-optical region of the lens can be formed as a whole in the manufacturing process, rather than as two separate parts.

[0037] The optical lens according to the exemplary embodiments of the present application can include at least one spacer, for example, can include at least one of a first spacer, a second spacer, a third spacer and a fourth spacer. Exemplarily, the first spacer can be located on the image side of the first lens and partially in contact with the image side surface of the first lens, and can abut against the non-optical region of the image side surface of the first lens. The second spacer can be located on the image side of the second lens and partially in contact with the image side surface of the second lens, and can abut against the non-optical region of the image side surface of the second lens. The third spacer can be located on the image side of the third lens and partially in contact with the image side surface of the third lens, and can abut against the non-optical region of the image side surface of the third lens. The fourth spacer can be located on the image side of the fourth lens and partially in contact with the image side surface of the fourth lens, and can abut against the non-optical region of the image side surface of the fourth lens. Exemplarily, the first spacer can be in contact with the non-optical region of the image side surface of the first lens, and can be in contact with the non-optical region of the object side surface of the second lens. For example, the object side surface of the first spacer can be in contact with the non-optical region of the image side surface of the first lens, and the image side surface of the first spacer can be in contact with the non-optical region of the object side surface of the second lens.

[0038] The optical lens according to the exemplary embodiments of the present application can include a lens barrel accommodating the lens group and the spacers. Exemplarily, as shown in FIG. 1, the lens barrel P0 can be a one-piece lens barrel for accommodating the first lens E1 to the fifth lens E5 and the first spacer P1 to the fourth spacer P4. Figures 1A-1C

[0039] According to the exemplary embodiments of the present application, the spacer can include at least one spacer piece, and by reasonably setting the number, thickness, inner diameter and outer diameter of the spacer piece, the assembly of the optical lens can be facilitated, stray light can be blocked, and the imaging quality of the optical lens can be improved.

[0040] In the exemplary embodiments, any two adjacent lenses among the first lens to the fifth lens can have an air gap, the first lens to the fifth lens each have a center thickness on the optical axis, and the center thickness of the fourth lens on the optical axis is the largest. Exemplarily, the optical lens according to the present application can satisfy: 0 < (CT4 + CT5 + T45) x tan(FOV / 4) / d0m < 2, CT4 is the center thickness of the fourth lens on the optical axis, CT5 is the center thickness of the fifth lens on the optical axis, T45 is the air gap of the fourth lens and the fifth lens on the optical axis, FOV is the maximum field of view angle of the optical lens, and d0m is the inner diameter of the image side end of the lens barrel.

[0041] ​In the present application, by reasonably matching the lens barrel, the number of lens pieces and the architecture, the spacer and the like, a lens with good imaging function, miniaturization and large field of view and the like can be designed. On this basis, by setting 0 < (CT4+CT5+T45) x tan(FOV / 4) / d0m < 2, it can not only ensure that the fourth lens and the fifth lens have a high forming yield and will not be cracked in the case of each lens group being suspended, but also can ensure the stability of the rear end part of the optical lens.

[0042] In the example embodiment, the first lens can have a positive refractive power, and the second lens can have a negative refractive power. The optical lens according to the present application can satisfy -2 < D1m / (f1+f2) < 0, D1m is the outer diameter of the image side surface of the first spacer, f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens. In the present application, by reasonably setting the five lens pieces, the refractive power of the first lens and the second lens, the spacer and the barrel and matching -2 < D1m / (f1+f2) < 0, the spherical aberration generated by the first lens and the second lens can be partially offset to reduce the aberration of the lens as a whole, so that the lens has better imaging quality, and by reasonably controlling the outer diameter of the first spacer, the outer diameter of the first lens can be limited to ensure that the outer diameter of the first lens is reasonable, so as to control the cut-off stray light.

[0043] In the example embodiment, the optical lens according to the present application can satisfy 0 < EP12 / (T12+T23) < 1, EP12 is the interval distance of the image side surface of the first spacer to the object side surface of the second spacer in the direction along the optical axis, T12 is the air interval of the first lens and the second lens along the optical axis, and T23 is the air interval of the second lens and the third lens along the optical axis. More specifically, EP12, T12 and T23 can further satisfy 0.4 < EP12 / (T12+T23) < 0.8. Satisfying 0 < EP12 / (T12+T23) < 1 is conducive to controlling the edge thickness of the first lens, the air interval of the first lens and the second lens, and the air interval of the second lens and the third lens within a reasonable range, so as to ensure that the air interval between adjacent lenses is relatively stable under external conditions such as high temperature, high humidity and dropping, and the imaging quality of the lens is less affected by the external conditions.

[0044] In exemplary embodiments, the optical lens according to the present application can satisfy: -10 < (R1+R3) / (EP01+EP12) < 0, R1 is the curvature radius of the object side surface of the first lens, R3 is the curvature radius of the object side surface of the second lens, EP01 is the interval distance in the direction along the optical axis from the object side end of the lens barrel to the object side surface of the first spacer, and EP12 is the interval distance in the direction along the optical axis from the image side surface of the first spacer to the object side surface of the second spacer. In the present application, by reasonably arranging the five lenses, the spacers, and the lens barrel as described above and in combination with -10 < (R1+R3) / (EP01+EP12) < 0, the machining angle of the object side surface of the first lens and the object side surface of the second lens can be reduced, which is conducive to the machining and forming of the first lens and the second lens. In addition, the thickness of the force bearing position of the lens barrel and the first lens is reasonable, which ensures the strength of the lens barrel and the first lens. Furthermore, the forming stability of the first lens and the second lens is improved, and they are less likely to be deformed.

[0045] In exemplary embodiments, the optical lens according to the present application can satisfy: V2 / EP12 < V1 / EP01 < V2 / EP12+V3 / EP23 and V3 / EP23 < V1 / EP01 < V2 / EP12+V3 / EP23, V2 is the Abbe number of the second lens, EP12 is the interval distance in the direction along the optical axis from the image side surface of the first spacer to the object side surface of the second spacer, V3 is the Abbe number of the third lens, EP23 is the interval distance in the direction along the optical axis from the image side surface of the second spacer to the object side surface of the third spacer, V1 is the Abbe number of the first lens, and EP01 is the interval distance in the direction along the optical axis from the object side end of the lens barrel to the object side surface of the first spacer. Satisfying V2 / EP12 < V1 / EP01 < V2 / EP12+V3 / EP23 and V3 / EP23 < V1 / EP01 < V2 / EP12+V3 / EP23 can alleviate the dispersion phenomenon of the first lens, the second lens, and the third lens by limiting the Abbe numbers of the three lenses, improve the pixels of the optical lens, and reasonably limit the edge thickness of the three lenses to reduce the forming difficulty of the three lenses.

[0046] In an example embodiment, the optical lens according to the present application can satisfy: 20 < (|f3| - f1) / (d3s - d1s) < 40, f3 is the effective focal length of the third lens, f1 is the effective focal length of the first lens, d3s is the inner diameter of the object side surface of the third spacer, and d1s is the inner diameter of the object side surface of the first spacer. Satisfying 20 < (|f3| - f1) / (d3s - d1s) < 40 can improve the imaging quality of the lens by controlling the effective focal lengths of the first lens and the third lens within a reasonable range, while reasonably setting the inner diameters of the first spacer and the third spacer can absorb excess stray light while ensuring the light flux between the first lens and the third lens, so that the lens can have higher image quality.

[0047] In an example embodiment, the optical lens according to the present application can satisfy: 7 < d3m x Fno / T34 < 15, d3m is the inner diameter of the image side surface of the third spacer, Fno is the F number of the optical lens, and T34 is the air gap of the third lens and the fourth lens on the optical axis. Satisfying 7 < d3m x Fno / T34 < 15 is conducive to reducing the air gap of the third lens and the fourth lens on the optical axis while controlling the F number of the optical lens within a reasonable range, so that the lens remains small in size and light in weight.

[0048] In an example embodiment, the optical lens according to the present application can satisfy: 2 < L / (CT4 + EP34) < 5, L is the maximum height of the lens barrel, CT4 is the center thickness of the fourth lens on the optical axis, and EP34 is the interval distance between the image side surface of the third spacer and the object side surface of the fourth spacer in the direction along the optical axis. In the present application, by reasonably setting the five lenses, the spacers and the lens barrel as described above and matching 2 < L / (CT4 + EP34) < 5, the thickness of the fourth lens can be controlled within a reasonable range, so that the fourth lens is easy to process and form while ensuring the stability of the fourth lens, and by limiting the maximum height of the lens barrel, the length of the side wall of the lens barrel can be controlled within a reasonable range, thereby reducing the influence on the true circularity of the inner diameter of the lens barrel.

[0049] In an example embodiment, the optical lens according to the present application can satisfy: -4 < R8 / (EP34 + CP3) < -1, R8 is the curvature radius of the image side surface of the fourth lens, EP34 is the interval distance between the image side surface of the third spacer and the object side surface of the fourth spacer in the direction along the optical axis, and CP3 is the maximum thickness of the third spacer. Satisfying -4 < R8 / (EP34 + CP3) < -1 can reduce the processing opening angle of the image side surface of the fourth lens by controlling the curvature radius of the image side surface of the fourth lens, which is conducive to the processing and forming of the fourth lens, and by reasonably controlling the thicknesses of the third spacer and the fourth spacer, the lens can be supported, thereby increasing the stability of the lens.

[0050] In an example embodiment, the fourth lens can have a positive refractive power. The optical lens according to the present application can satisfy: 3 < f4 / EP34 < 11, f4 is the effective focal length of the fourth lens, and EP34 is the interval distance in the direction along the optical axis from the image-side surface of the third spacer to the object-side surface of the fourth spacer. Satisfying 3 < f4 / EP34 < 11 can make the lens have better imaging quality, while being conducive to controlling the air interval of the third lens and the fourth lens on the optical axis, so that the lens remains small in size and reduces the weight of the lens.

[0051] In an example embodiment, the optical lens according to the present application can satisfy: 1 < f / (d0m-d4s) < 2, d0m is the inner diameter of the image-side end of the lens barrel, d4s is the inner diameter of the object-side surface of the fourth spacer, and f is the total effective focal length of the optical lens. Satisfying 1 < f / (d0m-d4s) < 2 can control the total refractive power of the lens within a reasonable range while ensuring the imaging quality of the optical lens to be stable, so that the lens does not excessively converge on a certain point during imaging, so as to ensure the light flux between the object-side end of the lens barrel and the fifth lens, and reduce the redundant stray light at the fourth lens and the fifth lens.

[0052] In another example embodiment, the optical lens provided by the present application comprises, in order from the object side to the image side along the optical axis, a lens set, at least one spacer, and a lens barrel for accommodating the lens set and the spacer. The lens set comprises, in order from the object side to the image side along the optical axis, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, wherein any two adjacent lenses among the first lens to the fifth lens have an air gap on the optical axis, the first lens to the fifth lens have a center thickness on the optical axis, and the center thickness of the fourth lens on the optical axis is the largest. On this basis, in order to improve the assembly stability of the rear end lens of the optical lens with the characteristics of miniaturization and large field of view, the object side surface of the first lens is provided as a convex surface. Exemplarily, the optical lens can satisfy 5 < f x tan(FOV / 2) x D0m / (d0s x R1) < 8, f is the total effective focal length of the optical lens, FOV is the maximum field of view of the optical lens, D0m is the outer diameter of the image side end of the lens barrel, d0s is the inner diameter of the object side end of the lens barrel, and R1 is the radius of curvature of the object side surface of the first lens. In the present application, by reasonably matching the lens barrel, the number of lens pieces, the shape of the object side surface of the first lens, the spacer, and limiting 5 < f x tan(FOV / 2) x D0m / (d0s x R1) < 8, it is beneficial to reduce the difficulty of processing and forming the first lens under the condition that the imaging surface of the optical lens is large, control the size of the object side end and the image side end of the lens barrel within a reasonable range, and facilitate the manufacturing and forming of the lens barrel. In an example embodiment, the optical lens according to the present application further comprises a diaphragm arranged between the object side and the first lens. Optionally, the above optical lens can further comprise a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface. The present application provides an optical lens with the characteristics of miniaturization, small volume, light weight, high stability, low sensitivity, high yield, and high imaging quality. The optical lens according to the above embodiments of the present application can adopt multiple lens pieces, for example, five pieces as described above. By reasonably allocating the refractive power, surface shape, material, center thickness of each lens, and axial distance between each lens, etc., the incident light can be effectively converged, the total optical length of the imaging lens can be reduced, and the processability of the imaging lens can be improved, so that the optical lens is more conducive to production and processing. In the optical lens according to the above embodiments of the present application, by arranging a spacer between adjacent lenses and designing the inner and outer diameters of the spacer according to the optical path, stray light can be effectively blocked and eliminated, and the imaging quality of the lens can be improved.

[0053] In the embodiments of the present application, at least one of the mirror surfaces of the lenses is an aspherical mirror surface, i.e., at least one of the object side surface of the first lens to the image side surface of the fifth lens is an aspherical mirror surface. The aspherical lens is characterized in that the curvature continuously changes from the center of the lens to the periphery of the lens. Unlike the spherical lens having a constant curvature from the center of the lens to the periphery of the lens, the aspherical lens has a better curvature radius characteristic, and has the advantages of improving the distortion aberration and improving the astigmatism aberration. After the aspherical lens is used, the aberration occurring during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of the object side surface and the image side surface of each of the first lens, the second lens, the third lens, the fourth lens and the fifth lens is an aspherical mirror surface. Optionally, the object side surface and the image side surface of each of the first lens, the second lens, the third lens, the fourth lens and the fifth lens are aspherical mirror surfaces.

[0054] However, those skilled in the art should understand that the number of lenses constituting the optical lens can be changed without departing from the technical solutions claimed by the present application, to obtain the various results and advantages described in the present specification. For example, although five lenses are described as an example in the embodiments, the optical lens is not limited to including five lenses. If necessary, the optical lens can also include other numbers of lenses.

[0055] The specific embodiments of the optical lens applicable to the above-described embodiments are further described below with reference to the accompanying drawings.

[0056] Example 1

[0057] The following refers to Figures 1A-2D The optical lens according to Embodiment 1 of the present application is described. Figures 1A-1C The optical lenses in the three embodiments in Embodiment 1 are respectively shown.

[0058] As Figures 1A-1C shown, the optical lens sequentially includes, from the object side to the image side, a diaphragm STO (not shown), a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter (not shown) and an imaging surface (not shown).

[0059] The first lens E1 has positive refractive power, the object side S1 is a convex surface, and the image side S2 is a concave surface. The second lens E2 has negative refractive power, the object side S3 is a concave surface, and the image side S4 is a concave surface. The third lens E3 has positive refractive power, the object side S5 is a concave surface, and the image side S6 is a convex surface. The fourth lens E4 has positive refractive power, the object side S7 is a concave surface, and the image side S8 is a convex surface. The fifth lens E5 has negative refractive power, the object side S9 is a convex surface, and the image side S10 is a concave surface. The filter has an object side S11 and an image side S12. Light from the object sequentially passes through each surface S1 to S12 and is finally imaged on the imaging surface.

[0060] Table 1 shows a basic parameter table of the optical lens of Example 1, wherein the units of the radius of curvature, the thickness / distance, and the focal length are all millimeters (mm).

[0061]

[0062]

[0063] Table 1

[0064] In this example, the maximum field of view FOV of the optical lens is 78.33°, the F number of the optical lens is 2.40, and the total effective focal length f of the optical lens is 4.98 mm.

[0065] As shown in Figures 1A-1C , the optical lens can include four spacers, which are a first spacer P1, a second spacer P2, a third spacer P3, and a fourth spacer P4. The lens barrel P0 can accommodate the first lens E1 to the fifth lens E5 and the first spacer P1 to the fourth spacer P4.

[0066] Table 2 shows a basic parameter table of each spacer in three implementation manners of the optical lens of Example 1.

[0067] Structural parameters Implementation 1 Implementation 2 Implementation 3 d1s (mm) 1.98 1.99 1.97 D1m (mm) 4.60 3.63 5.11 d3s (mm) 2.91 2.74 2.91 d3m (mm) 3.79 2.74 3.79 d4s (mm) 5.18 5.18 5.35 EP01 (mm) 0.84 0.75 0.75 EP12 (mm) 0.42 0.41 0.38 EP23 (mm) 0.45 0.53 0.44 CP3 (mm) 0.61 0.02 0.61 EP34 (mm) 0.70 1.28 0.91 d0s (mm) 3.02 3.89 3.10 d0m (mm) 8.18 8.21 8.68 D0s (mm) 4.83 6.49 4.67 D0m (mm) 8.48 8.51 8.98 L (mm) 4.44 4.64 4.36

[0068] Table 2

[0069] It should be understood that, in this example, the structures and parameters of each spacer in the three implementation manners are only exemplarily listed, and the specific structures and actual parameters of each spacer are not explicitly limited. In actual production, the specific structures and actual parameters of each spacer can be set by any suitable manner.

[0070] In Example 1, the object side and the image side of any one of the first lens E1 to the fifth lens E5 are aspherical surfaces, and the surface type x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0071]

[0072] 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. Tables 3-1 and 3-2 below give the higher-order coefficients A4, A6, A8, A10 that can be used for each aspherical mirror S1-S10 in Example 1. 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 and A 30 .

[0073] Face number A4 A6 A8 A10 A12 A14 A16 S1 -1.1677E-02 6.6142E-02 -8.8085E-01 6.9121E+00 -3.5772E+01 1.2732E+02 -3.2082E+02 S2 -1.2747E-02 -1.8435E-01 2.8334E+00 -2.5782E+01 1.5556E+02 -6.4964E+02 1.9269E+03 S3 6.8493E-03 1.3407E-01 -7.4753E-01 4.9734E+00 -2.0022E+01 3.7293E+01 3.4228E+01 S4 2.3638E-02 7.7252E-02 1.0192E-01 -7.2324E-01 1.9528E+00 -2.9440E+00 2.5420E+00 S5 -1.4325E-01 3.7387E-01 -5.1801E+00 4.5207E+01 -2.6778E+02 1.1103E+03 -3.2935E+03 S6 -1.0262E-01 1.1055E-02 -2.3591E-01 1.9344E+00 -9.8039E+00 3.3310E+01 -7.9263E+01 S7 -1.2265E-02 -1.3985E-02 -4.5903E-02 1.5475E-01 -2.7481E-01 3.2263E-01 -2.6522E-01 S8 5.2391E-02 -8.1594E-02 8.8751E-02 -8.5534E-02 7.0883E-02 -4.7278E-02 2.4365E-02 S9 -2.1441E-01 1.0913E-01 -3.2157E-02 8.0219E-03 -2.3784E-03 7.7886E-04 -2.1430E-04 S10 -1.1570E-01 5.4440E-02 -1.0554E-02 -4.3805E-03 4.4714E-03 -1.8970E-03 5.0887E-04

[0074] Table 3-1

[0075] Face number A18 A20 A22 A24 A26 A28 A30 S1 5.8174E+02 -7.6248E+02 7.1661E+02 -4.7129E+02 2.0612E+02 -5.3890E+01 6.3777E+00 S2 -4.1139E+03 6.3356E+03 -6.9701E+03 5.3386E+03 -2.7027E+03 8.1244E+02 -1.0976E+02 S3 -3.8612E+02 1.0718E+03 -1.6926E+03 1.6792E+03 -1.0386E+03 3.6742E+02 -5.6932E+01 S4 -1.1226E+00 1.9573E-01 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 7.0627E+03 -1.0952E+04 1.2141E+04 -9.3662E+03 4.7680E+03 -1.4376E+03 1.9416E+02 S6 1.3474E+02 -1.6419E+02 1.4199E+02 -8.4860E+01 3.3250E+01 -7.6678E+00 7.8694E-01 S7 1.5558E-01 -6.5242E-02 1.9353E-02 -3.9552E-03 5.2830E-04 -4.1383E-05 1.4366E-06 S8 -9.4932E-03 2.7504E-03 -5.8010E-04 8.6145E-05 -8.5054E-06 4.9977E-07 -1.3195E-08 S9 4.3881E-05 -6.4533E-06 6.6736E-07 -4.7031E-08 2.1328E-09 -5.5486E-11 6.1894E-13 S10 -9.3908E-05 1.2220E-05 -1.1201E-06 7.0751E-08 -2.9288E-09 7.1421E-11 -7.7641E-13

[0076] Table 3-2

[0077] Figure 2A The on-axis chromatic aberration curve of the optical lens of Embodiment 1 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 2B The astigmatism curve of the optical lens of Embodiment 1 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 2C The distortion curve of the optical imaging lens of Example 1 is shown, which represents the distortion magnitude value corresponding to different field of view angles. Figure 2D The magnification chromatic aberration curve of the optical imaging lens of Embodiment 1 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to Figures 2A-2D It can be seen that the optical imaging lens given in Example 1 can achieve good imaging quality.

[0078] Example 2

[0079] The following is for reference Figures 3A-4D This paper describes an optical lens according to Embodiment 2 of this application. For the sake of brevity, descriptions similar to those in Embodiment 1 will be omitted in this embodiment and the following embodiments. Figures 3A-3C The optical lenses in three different embodiments of Example 1 are shown respectively.

[0080] like Figures 3A-3CAs shown, the optical lens, from the object side to the image side, includes, in sequence: aperture stop STO (not shown), first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, filter (not shown), and imaging plane (not shown).

[0081] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being convex. The third lens E3 has negative optical power, with its object-side surface S5 being concave and its image-side surface S6 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The filter has an object-side surface S11 and an image-side surface S12. Light from the object passes sequentially through each surface S1 to S12 and is finally imaged on the imaging plane.

[0082] In this example, the maximum field of view (FOV) of the optical lens is 82.88°, the F-number of the optical lens is 2.09, and the total effective focal length (f) of the optical lens is 4.44mm.

[0083] like Figures 3A-3C As shown, the optical lens may include four spacers: a first spacer P1, a second spacer P2, a third spacer P3, and a fourth spacer P4. The lens barrel P0 may accommodate the first lens E1 to the fifth lens E5 and the first spacers P1 to the fourth spacers P4.

[0084] It should be understood that this example only exemplifies the structure and parameters of each spacer under three implementation methods, and does not explicitly limit the specific structure and actual parameters of each spacer. In actual production, the specific structure and actual parameters of each spacer can be set in any suitable manner.

[0085] Table 4 shows the basic parameters of the optical lens of Embodiment 2, wherein the units of radius of curvature, thickness / distance, and focal length are all millimeters (mm). Table 5 shows the basic parameters of each spacer in the three embodiments of the optical lens of Embodiment 2. Tables 6-1 and 6-2 show the higher-order coefficients that can be used for each aspherical mirror in Embodiment 2, wherein each aspherical surface shape can be defined by formula (1) given in Embodiment 1 above.

[0086]

[0087]

[0088] Table 4

[0089] Structural parameters Implementation 1 Implementation 2 Implementation 3 d1s (mm) 2.09 2.08 2.12 D1m (mm) 4.80 6.00 4.18 d3s (mm) 3.16 3.23 3.22 d3m (mm) 3.82 3.23 3.22 d4s (mm) 5.30 5.08 5.31 EP01 (mm) 0.62 0.71 0.85 EP12 (mm) 0.42 0.41 0.42 EP23 (mm) 0.53 0.69 0.70 CP3 (mm) 0.43 0.03 0.03 EP34 (mm) 0.42 0.63 0.63 d0s (mm) 3.00 3.12 3.32 d0m (mm) 9.09 9.19 9.19 D0s (mm) 5.61 8.57 7.03 D0m (mm) 9.39 9.49 10.03 L (mm) 4.77 5.06 5.08

[0090] Table 5

[0091] Face number A4 A6 A8 A10 A12 A14 A16 S1 -1.4941E-02 5.3407E-02 -3.1036E-01 9.1463E-01 -1.7345E+00 2.0384E+00 -1.4560E+00 S2 -2.5575E-02 -3.0536E-02 3.8049E-02 -1.3231E-01 2.3229E-01 -2.4738E-01 1.5667E-01 S3 -7.6695E-02 2.4970E-01 -2.9249E-01 2.4353E-01 7.1035E-02 -4.9561E-01 6.1830E-01 S4 -1.5503E-02 1.6832E-01 1.9735E-01 -1.4364E+00 3.8009E+00 -5.7078E+00 5.0578E+00 S5 -1.1228E-01 2.4304E-01 -2.3655E+00 1.5296E+01 -6.5624E+01 1.9250E+02 -3.9420E+02 S6 -6.8274E-02 -3.8588E-02 3.4573E-01 -1.4720E+00 4.4461E+00 -9.9918E+00 1.6800E+01 S7 -2.4354E-02 1.2192E-02 -4.5432E-02 8.2914E-02 -1.0892E-01 1.0896E-01 -8.3582E-02 S8 2.0638E-02 -7.8902E-02 1.9752E-01 -3.4707E-01 4.1338E-01 -3.4206E-01 2.0135E-01 S9 -2.5175E-01 1.6332E-01 -8.8553E-02 4.6844E-02 -2.0648E-02 6.7807E-03 -1.6076E-03 S10 -9.4858E-02 4.6987E-02 -1.5109E-02 3.4790E-03 -6.0145E-04 8.8796E-05 -1.4282E-05

[0092] Table 6-1

[0093]

[0094]

[0095] Table 6-2

[0096] Figure 4A The axial chromatic aberration curve of the optical lens of Example 2 is shown, which represents the deviation of light rays of different wavelengths from the converging focal point after passing through the lens. Figure 4B The astigmatism curve of the optical lens of Example 2 is shown, which represents the meridional image curvature and sagittal image curvature. Figure 4C The distortion curve of the optical imaging lens of Example 2 is shown, which represents the distortion size values corresponding to different field angles of view. Figure 4D The lateral chromatic aberration curve of the optical imaging lens of Example 2 is shown, which represents the deviation of light rays on the imaging plane after passing through the lens. According to Figures 4A-4D It can be seen that the optical imaging lens given in Example 2 can achieve good imaging quality.

[0097] Example 3

[0098] The following refers to Figures 5A-6D An optical lens according to Example 3 of the present application is described. Figures 5A-5C The optical lenses in three embodiments of Example 3 are shown respectively.

[0099] As shown in Figures 5A-5C , the optical lens sequentially includes, from the object side to the image side: a stop STO (not shown), a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter (not shown), and an imaging plane (not shown).

[0100] The first lens E1 has positive refractive power, the object side surface S1 is convex, and the image side surface S2 is concave. The second lens E2 has negative refractive power, the object side surface S3 is concave, and the image side surface S4 is concave. The third lens E3 has positive refractive power, the object side surface S5 is convex, and the image side surface S6 is concave. The fourth lens E4 has positive refractive power, the object side surface S7 is convex, and the image side surface S8 is convex. The fifth lens E5 has negative refractive power, the object side surface S9 is concave, and the image side surface S10 is concave. The filter has an object side surface S11 and an image side surface S12. Light from the object sequentially passes through each surface S1 to S12 and is finally imaged on the imaging plane.

[0101] In the present example, the maximum field of view FOV of the optical lens is 77.27°, the F number of the optical lens is 2.40, and the total effective focal length f of the optical lens is 3.96 mm.

[0102] As shown in FIG. 1, the optical lens can include four spacers, which are a first spacer P1, a second spacer P2, a third spacer P3, and a fourth spacer P4. The lens barrel P0 can accommodate the first lens E1 to the fifth lens E5 and the first spacer P1 to the fourth spacer P4. Figures 5A-5C

[0103] It should be understood that in the present example, the structures and parameters of the spacers in the three embodiments are only exemplarily listed, and the specific structures and actual parameters of the spacers are not explicitly limited. In actual production, the specific structures and actual parameters of the spacers can be set by any suitable manner.

[0104] Table 7 shows a basic parameter table of the optical lens of Example 3, wherein the units of the radius of curvature, the thickness / distance, and the focal length are millimeters (mm). Table 8 shows a basic parameter table of the spacers in the three embodiments of the optical lens of Example 3. Tables 9-1 and 9-2 show the high-order term coefficients of the aspherical surfaces that can be used in Example 3, wherein each aspherical surface type can be defined by the formula (1) given in Example 1 above.

[0105]

[0106] Table 7

[0107] Structural parameters Implementation 1 Implementation 2 Implementation 3 d1s (mm) 1.53 1.52 1.51 D1m (mm) 4.10 5.38 3.88 d3s (mm) 2.71 3.18 3.17 d3m (mm) 2.71 3.18 3.17 d4s (mm) 4.37 4.36 4.37 EP01 (mm) 0.62 0.62 0.78 EP12 (mm) 0.60 0.58 0.43 EP23 (mm) 0.40 0.52 0.66 CP3 (mm) 0.02 0.03 0.03 EP34 (mm) 0.61 0.42 0.43 d0s (mm) 2.37 2.50 2.61 d0m (mm) 7.32 7.34 7.20 D0s (mm) 4.76 7.40 6.03 D0m (mm) 7.62 7.64 7.50 L (mm) 3.70 3.81 3.81

[0108] Table 8

[0109]

[0110]

[0111] Table 9-1

[0112] Face number A18 A20 A22 A24 A26 A28 A30 S1 -2.7719E+05 5.7081E+05 -8.4457E+05 8.7399E+05 -6.0002E+05 2.4535E+05 -4.5205E+04 S2 -3.0244E+06 7.4636E+06 -1.3198E+07 1.6301E+07 -1.3352E+07 6.5158E+06 -1.4340E+06 S3 3.0005E+06 -7.9245E+06 1.4948E+07 -1.9631E+07 1.7043E+07 -8.7874E+06 2.0367E+06 S4 7.3864E+04 -4.0815E+05 1.0919E+06 -1.7782E+06 1.7898E+06 -1.0284E+06 2.5887E+05 S5 4.3970E+03 -5.9498E+03 5.6392E+03 -3.6596E+03 1.5470E+03 -3.8326E+02 4.2170E+01 S6 -6.2363E+01 3.8077E+01 -1.3174E+01 1.0217E+00 1.0631E+00 -4.0874E-01 4.8077E-02 S7 9.0618E-02 1.6223E-01 -1.1441E-01 3.8990E-02 -7.6675E-03 8.3276E-04 -3.8832E-05 S8 -1.2596E+00 4.7059E-01 -1.2482E-01 2.2884E-02 -2.7543E-03 1.9567E-04 -6.2151E-06 S9 -6.0546E-03 1.0588E-03 -1.2505E-04 9.7116E-06 -4.6315E-07 1.1620E-08 -9.8948E-11 S10 -1.9399E-03 3.6891E-04 -4.6170E-05 3.7737E-06 -1.9143E-07 5.3352E-09 -5.9150E-11

[0113] Table 9-2

[0114] Figure 6A FIG. 8 shows an axial chromatic aberration curve of the optical lens of Example 3, which represents the convergence point deviation of light rays of different wavelengths after passing through the lens. Figure 6B FIG. 9 shows a stigmation curve of the optical lens of Example 3, which represents the meridional image surface curvature and sagittal image surface curvature. Figure 6C FIG. 10 shows a distortion curve of the optical imaging lens of Example 3, which represents the distortion size values corresponding to different field angles. Figure 6D ​The magnification chromatic aberration curve of the optical imaging lens of embodiment 3 is shown, which represents the deviation of different image heights of light rays after passing through the lens on the imaging plane. According to Figures 6A-6D It can be known that the optical imaging lens given in embodiment 3 can achieve good imaging quality.

[0115] In summary, embodiments 1 to 3 respectively satisfy the relationships shown in Tables 10-1, 10-2 and 10-3.

[0116]

[0117]

[0118] Table 10-1

[0119]

[0120] Table 10-2

[0121]

[0122]

[0123] Table 10-3

[0124] The present application also provides an imaging device, the electronic photosensitive element of which can be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The imaging device can be a stand-alone imaging device such as a digital camera, or an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical lens described above.

[0125] The above description is merely preferred embodiments of the present application and a description of the principles of the technology used. Those skilled in the art should understand that the scope of the application involved in the present application is not limited to the technical solutions formed by the specific combinations of the technical features described above, and should also cover other technical solutions formed by any combination of the above technical features or equivalent features without departing from the inventive concept. For example, the above features can be replaced with technical features disclosed in the present application (but not limited to) having similar functions to form technical solutions.

Claims

1. An optical lens characterized in that, Comprise: a lens set comprising, in order from an object side to an image side along an optical axis, a first lens having positive refractive power, a second lens having negative refractive power, a third lens having positive refractive power or negative refractive power, a fourth lens having positive refractive power, and a fifth lens having negative refractive power, wherein an object side surface of the first lens is convex and an image side surface of the first lens is concave, an object side surface of the second lens is concave, an image side surface of the fourth lens is convex, an image side surface of the fifth lens is concave, any two adjacent lenses among the first lens to the fifth lens have an air gap on the optical axis, the first lens to the fifth lens all have a center thickness on the optical axis, and the center thickness of the fourth lens on the optical axis is the largest, and the number of lenses having refractive power in the lens set is five; at least one spacer, comprising a third spacer located on the image side of the third lens and partially in contact with the image side surface of the third lens; and a lens barrel for accommodating the lens set and the spacer, having an object side end facing the object side and an image side end facing the image side; wherein the optical lens satisfies: 0.55≤(CT4+CT5+T45)×tan(FOV / 4) / d0m≤1.72 and 7.03≤d3m×Fno / T34≤13.45, CT4 is the center thickness of the fourth lens on the optical axis, CT5 is the center thickness of the fifth lens on the optical axis, T45 is the air gap of the fourth lens and the fifth lens on the optical axis, FOV is the maximum field of view angle of the optical lens, d0m is the inner diameter of the image side end of the lens barrel, d3m is the inner diameter of the image side surface of the third spacer, Fno is the F number of the optical lens, and T34 is the air gap of the third lens and the fourth lens on the optical axis.

2. The optical lens of claim 1, wherein, The at least one spacer further comprises a first spacer located on the image side of the first lens and partially in contact with the image side surface of the first lens, wherein The optical lens satisfies: -1.26≤D1m / (f1+f2)≤-0.33, D1m is the outer diameter of the image side surface of the first spacer, f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens.

3. The optical lens of claim 1, wherein The at least one spacer further comprises: a first spacer located on the image side of the first lens and partially in contact with the image side surface of the first lens; and a second spacer located on the image side of the second lens and partially in contact with the image side surface of the second lens, wherein The optical lens satisfies: 0.49≤EP12 / (T12+T23)≤0.74, EP12 is the separation distance of the image side surface of the first spacer to the object side surface of the second spacer in the direction along the optical axis, T12 is the air gap of the first lens and the second lens on the optical axis, and T23 is the air gap of the second lens and the third lens on the optical axis.

4. The optical lens of claim 1, wherein The at least one spacer further comprises: a first spacer located on the image side of the first lens and partially in contact with the image side surface of the first lens; and A second spacer is located on the image side of the second lens and partially contacts the image side surface of the second lens, wherein The optical lens satisfies: -9.43≤(R1+R3) / (EP01+EP12)≤-1.27, R1 is the radius of curvature of the object side surface of the first lens, R3 is the radius of curvature of the object side surface of the second lens, EP01 is the interval distance from the object side end of the lens barrel to the object side surface of the first spacer in the direction along the optical axis, and EP12 is the interval distance from the image side surface of the first spacer to the object side surface of the second spacer in the direction along the optical axis.

5. The optical lens of claim 1, wherein The at least one spacer further comprises: A first spacer is located on the image side of the first lens and partially contacts the image side surface of the first lens; and A second spacer is located on the image side of the second lens and partially contacts the image side surface of the second lens, wherein the optical lens satisfies: 32.27 mm -1 V2 / EP12 < V1 / EP01 < V2 / EP12 + V3 / EP23 ≤ 109.80 mm -1 and 36.89 mm -1 V3 / EP23 < V1 / EP01 < V2 / EP12 + V3 / EP23 ≤ 109.80 mm -1 V2 is the Abbe number of the second lens, EP12 is the interval distance of the image side surface of the first spacer to the object side surface of the second spacer in the direction along the optical axis, V3 is the Abbe number of the third lens, EP23 is the interval distance of the image side surface of the second spacer to the object side surface of the third spacer in the direction along the optical axis, V1 is the Abbe number of the first lens, and EP01 is the interval distance of the object side end of the lens barrel to the object side surface of the first spacer in the direction along the optical axis.

6. The optical lens of claim 1, wherein, The at least one spacer further comprises: A first spacer is located on the image side of the first lens and partially contacts the image side surface of the first lens, wherein The optical lens satisfies: 21.97≤(|f3|-f1) / (d3s-d1s)≤36.70, f3 is the effective focal length of the third lens, f1 is the effective focal length of the first lens, d3s is the inner diameter of the object side surface of the third spacer, and d1s is the inner diameter of the object side surface of the first spacer.

7. The optical lens of any of claims 1-4, wherein, The at least one spacer further comprises: A fourth spacer is located on the image side of the fourth lens and partially contacts the image side surface of the fourth lens, wherein The optical lens satisfies: 2.08≤L / (CT4+EP34)≤3.98, L is the maximum height of the lens barrel, CT4 is the central thickness of the fourth lens on the optical axis, and EP34 is the interval distance from the image side surface of the third spacer to the object side surface of the fourth spacer in the direction along the optical axis.

8. The optical lens of any of claims 1-4, wherein, The at least one spacer further comprises: A fourth spacer is located on the image side of the fourth lens and partially contacts the image side surface of the fourth lens, wherein The optical lens satisfies: -3.64≤R8 / (EP34+CP3)≤-1.66, R8 is the radius of curvature of the image side surface of the fourth lens, EP34 is the interval distance from the image side surface of the third spacer to the object side surface of the fourth spacer in the direction along the optical axis, and CP3 is the maximum thickness of the third spacer.

9. The optical lens of any of claims 1-4, wherein, The at least one spacer further comprises: A fourth spacer is located on the image side of the fourth lens and partially contacts the image side surface of the fourth lens, wherein The optical lens satisfies: 3.68≤f4 / EP34≤10.50, f4 is the effective focal length of the fourth lens, and EP34 is the interval distance from the image side surface of the third spacer to the object side surface of the fourth spacer in the direction along the optical axis.

10. The optical lens of any of claims 1-6, wherein, The at least one spacer further comprises a fourth spacer located on the image side of the fourth lens and partially contacting the image side surface of the fourth lens, wherein The optical lens satisfies: 1.08≤f / (d0m-d4s)≤1.66, d0m is an inner diameter of an image-side end of the lens barrel, d4s is an inner diameter of an object-side surface of the fourth spacer, and f is a total effective focal length of the optical lens.

11. The optical lens according to any one of claims 1-6, characterized in that, The optical lens satisfies: 5.48≤fxtan(FOV / 2)xD0m / (d0sXR1)≤7.80, f is a total effective focal length of the optical lens, FOV is a maximum field of view angle of the optical lens, D0m is an outer diameter of an image-side end of the lens barrel, d0s is an inner diameter of an object-side end of the lens barrel, and R1 is a radius of curvature of an object-side surface of the first lens.

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