Photographic lens

Abstract

The application discloses a photographic lens. The photographic lens comprises a lens group, at least one positioning member, and a lens barrel for accommodating the lens group and the at least one positioning member. The lens group comprises, in sequence from an object side to an image side along an optical axis, a first lens with optical power, a second lens, a third lens, a fourth lens, and a fifth lens, wherein an image side surface of the fifth lens is concave. The at least one positioning member comprises a fourth positioning member located on an image side of the fourth lens and partially in contact with an image side surface of the fourth lens. The photographic lens satisfies the condition (D4m+d4m) / (D4m-d4m)×|R9 / R8|>33, wherein d4m is an inner diameter of the image side surface of the fourth positioning member, D4m is an outer diameter of the image side surface of the fourth positioning member, R8 is a curvature radius of the image side surface of the fourth lens, and R9 is a curvature radius of an object side surface of the fifth lens.

Description

Technical Field

[0001] This application relates to the field of optical components, and more specifically, to a photographic lens. Background Technology

[0002] In recent years, smartphones and other smart products, along with their related technologies, have experienced rapid iteration and development. At the same time, camera lenses integrated into smartphones and other smart products, as an important component, have received widespread attention from consumers. Currently, most smartphones are equipped with telephoto lenses for capturing distant objects.

[0003] However, telephoto lenses often exhibit more stray light and other artifacts. In some cases, this excessive stray light can severely degrade the image quality of the lens. Therefore, improving the image quality of telephoto lenses is crucial. Summary of the Invention

[0004] This application provides a photographic lens that, along the optical axis from the object side to the image side, sequentially comprises a lens group, at least one positioning member, and a lens barrel for accommodating the lens group and the at least one positioning member. The lens group, along the optical axis from the object side to the image side, sequentially comprises a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, each having optical power, wherein the image-side surface of the fifth lens is concave. The at least one positioning member includes a fourth positioning member located on the image side of the fourth lens and partially in contact with the image-side surface of the fourth lens. The photographic lens satisfies: (D4m+d4m) / (D4m-d4m)×|R9 / R8|>33, where d4m is the inner diameter of the image-side surface of the fourth positioning member, D4m is the outer diameter of the image-side surface of the fourth positioning member, R8 is the radius of curvature of the image-side surface of the fourth lens, and R9 is the radius of curvature of the object side surface of the fifth lens.

[0005] In one embodiment, 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.

[0006] In one embodiment, at least one positioning member further includes: a first positioning member located on the image side of the first lens and in contact with a portion of the image-side surface of the first lens; a second positioning member located on the image side of the second lens and in contact with a portion of the image-side surface of the second lens; and a third positioning member located on the image side of the third lens and in contact with a portion of the image-side surface of the third lens. The photographic lens may satisfy: D1s > D2s > D3s, where D1s is the outer diameter of the object-side surface of the first positioning member, D2s is the outer diameter of the object-side surface of the second positioning member, and D3s is the outer diameter of the object-side surface of the third positioning member.

[0007] In one embodiment, the image-side surface of the fifth lens rests against the image-side end of the lens barrel.

[0008] In one embodiment, at least one positioning element further includes a fifth positioning element located on the image side of the fifth lens and in contact with the image side surface portion of the fifth lens. The camera lens may satisfy: 0 < (CP5 + CP4) / ∑CT < 0.3, where ∑CT is the sum of the center thicknesses of the first to fifth lenses along the optical axis, CP5 is the maximum thickness of the fifth positioning element, and CP4 is the maximum thickness of the fourth positioning element.

[0009] In one embodiment, the camera lens may satisfy: 3.7 < 1 / tan(Semi-FOV) × d0s / EPD < 4.2, where d0s is the inner diameter of the object-side end of the lens barrel, Semi-FOV is half of the maximum field of view of the camera lens, and EPD is the entrance pupil diameter of the camera lens.

[0010] In one implementation, the camera lens may meet the following requirements: 45mm 2 <π×(D3s^2-d3s^2)<69mm 2 Where D3s is the outer diameter of the object side of the third positioning component, and d3s is the inner diameter of the object side of the third positioning component.

[0011] In one embodiment, the camera lens may satisfy: 0.3 < D5s / d5s×(f5-f4) / (f5+f4) < 4, where D5s is the outer diameter of the object side of the fifth positioning member, d5s is the inner diameter of the object side of the fifth positioning member, f4 is the effective focal length of the fourth lens, and f5 is the effective focal length of the fifth lens.

[0012] In one embodiment, the camera lens may satisfy: 0.3 < CP4 / T45 < 12, where T45 is the air gap between the fourth and fifth lenses on the optical axis, and CP4 is the maximum thickness of the fourth positioning element.

[0013] In one embodiment, the camera lens may satisfy: 8 < (f × f) / (∑AT × L) < 14, where f is the total effective focal length of the camera lens, L is the maximum length of the lens barrel, and ∑AT is the sum of the air gaps on the optical axis between any two adjacent lenses from the first to the fifth lens.

[0014] In one embodiment, the camera lens may satisfy: -33 < R6 / R7 × (EP34 / CP3) < -18, where R6 is the radius of curvature of the image-side surface of the third lens, R7 is the radius of curvature of the object-side surface of the fourth lens, EP34 is the distance between the image-side surface of the third positioning member and the object-side surface of the fourth positioning member along the optical axis, and CP3 is the maximum thickness of the third positioning member.

[0015] In one embodiment, among the inner diameters of the object-side and image-side of the first, second, third, fourth, and fifth positioning members, the inner diameter of the object-side of the third positioning member is the smallest; and the photographic lens can satisfy: 1.4 < d0s / d3s < 1.7, where d0s is the inner diameter of the object-side end of the lens barrel, and d3s is the inner diameter of the object-side of the third positioning member.

[0016] This application also provides a photographic lens that, along the optical axis from the object side to the image side, sequentially includes a lens group, at least one positioning member, and a lens barrel for accommodating the lens group and the at least one positioning member. The lens group, along the optical axis from the object side to the image side, sequentially includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, each having optical power, wherein the image-side surface of the fifth lens is concave. The at least one positioning member includes a third positioning member located on the image side of the third lens and partially in contact with the image-side surface of the third lens. The photographic lens can satisfy: 45mm. 2 <π×(D3s^2-d3s^2)<69mm 2 Where D3s is the outer diameter of the object side of the third positioning component, and d3s is the inner diameter of the object side of the third positioning component.

[0017] In one embodiment, at least one positioning member further includes: a first positioning member located on the image side of the first lens and in contact with a portion of the image-side surface of the first lens; and a second positioning member located on the image side of the second lens and in contact with a portion of the image-side surface of the second lens. The photographic lens may satisfy: D1s > D2s > D3s, where D1s is the outer diameter of the object-side surface of the first positioning member, D2s is the outer diameter of the object-side surface of the second positioning member, and D3s is the outer diameter of the object-side surface of the third positioning member.

[0018] In one embodiment, at least one positioning element further includes: a fourth positioning element located on the image side of the fourth lens and in contact with the image side portion of the fourth lens; and a fifth positioning element located on the image side of the fifth lens and in contact with the image side portion of the fifth lens. The photographic lens can satisfy: 0 < (CP5 + CP4) / ∑CT < 0.3, where ∑CT is the sum of the center thicknesses of the first to fifth lenses along the optical axis, CP5 is the maximum thickness of the fifth positioning element, and CP4 is the maximum thickness of the fourth positioning element.

[0019] In one embodiment, the camera lens may satisfy: 0.3 < D5s / d5s×(f5-f4) / (f5+f4) < 4, where D5s is the outer diameter of the object side of the fifth positioning member, d5s is the inner diameter of the object side of the fifth positioning member, f4 is the effective focal length of the fourth lens, and f5 is the effective focal length of the fifth lens.

[0020] In one embodiment, the camera lens may satisfy: -33 < R6 / R7 × (EP34 / CP3) < -18, where R6 is the radius of curvature of the image-side surface of the third lens, R7 is the radius of curvature of the object-side surface of the fourth lens, EP34 is the distance between the image-side surface of the third positioning member and the object-side surface of the fourth positioning member along the optical axis, and CP3 is the maximum thickness of the third positioning member.

[0021] In one embodiment, among the inner diameters of the object-side and image-side of the first, second, third, fourth, and fifth positioning members, the inner diameter of the object-side of the third positioning member is the smallest; and the photographic lens can satisfy: 1.4 < d0s / d3s < 1.7, where d0s is the inner diameter of the object-side end of the lens barrel, and d3s is the inner diameter of the object-side of the third positioning member.

[0022] In one embodiment, the image-side surface of the fifth lens rests against the image-side end of the lens barrel.

[0023] In one embodiment, the camera lens may satisfy: 3.7 < 1 / tan(Semi-FOV) × d0s / EPD < 4.2, where d0s is the inner diameter of the object-side end of the lens barrel, Semi-FOV is half of the maximum field of view of the camera lens, and EPD is the entrance pupil diameter of the camera lens.

[0024] In one embodiment, the camera lens may satisfy: 0.3 < CP4 / T45 < 12, where T45 is the air gap between the fourth and fifth lenses on the optical axis, and CP4 is the maximum thickness of the fourth positioning element.

[0025] In one embodiment, the camera lens may satisfy: 8 < (f × f) / (∑AT × L) < 14, where f is the total effective focal length of the camera lens, L is the maximum length of the lens barrel, and ∑AT is the sum of the air gaps on the optical axis between any two adjacent lenses from the first to the fifth lens.

[0026] In one exemplary embodiment of this application, by reasonably arranging five lenses, the image-side profile of the fifth lens, at least one positioning element, and the lens barrel, and by combining (D4m+d4m) / (D4m-d4m)×|R9 / R8|>33, it is beneficial to enable the photographic lens to have characteristics such as telephoto capability and less stray light. By reasonably setting the inner and outer diameters of the fourth positioning element, this application can effectively avoid the risk of stray light between the fourth and fifth lenses in a five-element telephoto lens, reducing the interference of stray light on the image quality.

[0027] In another exemplary embodiment of this application, by reasonably arranging five lenses, the image-side profile of the fifth lens, at least one positioning element, and the lens barrel, and using a 45mm lens... 2 <π×(D3s^2-d3s^2)<69mm2 This allows for the creation of photographic lenses with characteristics such as telephoto capabilities and reduced stray light. For example, this application, through the rational combination of the lens barrel, the number and structure of the lenses, and the positioning components, facilitates the design of a lens with telephoto characteristics. Furthermore, by rationally setting the outer and inner diameters of the third positioning component, the feasibility of its fabrication and its bearing area are improved, thereby increasing the stability of adjacent components such as the third and fourth lenses. In addition, by rationally setting the inner diameter of the third positioning component, excess stray light in the lens can be reduced without affecting lens performance, thus improving the lens's imaging effect. Attached Figure Description

[0028] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0029] Figures 1A to 1C These are schematic diagrams of the camera lens under three different implementation methods in Example 1;

[0030] Figures 2A to 2C The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the photographic lens of Example 1 are shown respectively.

[0031] Figures 3A to 3C These are schematic diagrams of the camera lens under three different implementation methods in Example 2;

[0032] Figures 4A to 4C The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the photographic lens of Example 2 are shown respectively.

[0033] Figures 5A to 5C These are schematic diagrams of the camera lens under three different implementation methods in Example 3;

[0034] Figures 6A to 6C The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the photographic lens of Embodiment 3 are shown respectively; and

[0035] Figure 7 and Figure 8 These are schematic diagrams showing some parameters of the camera lens according to embodiments of this application. Detailed Implementation

[0036] 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.

[0037] 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, and the first positioning element may also be referred to as the second positioning element or the third positioning element.

[0038] 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 drawn to scale. It should be understood that, for ease of illustration, the thickness, size, and shape of the positioning elements and lens barrel have also been slightly exaggerated in the accompanying drawings.

[0039] In this text, 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 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. It should be understood that the surface of each positioning element closest to the subject is called the object-side surface of the positioning element, and the surface of each positioning element closest to the imaging plane is called the image-side surface of the positioning element. The surface of the lens barrel closest to the subject is called the object-side end of the lens barrel, and the surface of the lens barrel closest to the imaging plane is called the image-side end of the lens barrel.

[0040] 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.

[0041] 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 the 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.

[0042] It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other. The following embodiments only illustrate several implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be pointed out that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of this application, and these all fall within the protection scope of this application. For example, the lens groups (i.e., the first to fifth lenses), lens barrel structures, and positioning components in the various embodiments of this application can be arbitrarily combined, and it is not limited to the lens group in one embodiment being combined only with the lens barrel structure, positioning components, etc. of that embodiment. The present application will now be described in detail with reference to the accompanying drawings and embodiments.

[0043] The features, principles and other aspects of this application are described in detail below.

[0044] A photographic lens according to an exemplary embodiment of this application may include five lenses with optical power, namely a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. These five lenses are arranged sequentially along the optical axis from the object side to the image side. Any two adjacent lenses among the first to fifth lenses may have a gap between them.

[0045] According to an exemplary embodiment of this application, each of the first to fifth lenses may have an optical region for optical imaging and a non-optical region extending outward from the outer periphery of the optical region. Generally speaking, the optical region refers to the area of ​​the lens used for optical imaging, while the non-optical region is the structural area of ​​the lens. During the assembly of the photographic lens, positioning elements can be set at the non-optical regions of each lens using processes such as adhesive bonding, and each lens can be connected to the lens barrel respectively. During the imaging process of the photographic lens, the optical regions of each lens can transmit light from the object to form an optical path, forming the final optical image; while the non-optical regions of each assembled lens are housed in the lens barrel, which cannot transmit light, thus the non-optical regions do not directly participate in the imaging process of the photographic lens. It should be noted that, for ease of description, this application describes each lens as divided into two parts: an optical region and a non-optical region. However, it should be understood that the optical region and the non-optical region of the lens can be formed as a whole during the manufacturing process, rather than as two separate parts.

[0046] A photographic lens according to an exemplary embodiment of this application may include four or five positioning members, namely a first positioning member, a second positioning member, a third positioning member, and a fourth positioning member; or a first positioning member, a second positioning member, a third positioning member, a fourth positioning member, and a fifth positioning member. Specifically, the photographic lens may include a first positioning member located on the image side of a first lens and in contact with a portion of the image side surface of the first lens, which may abut against a non-optical area of ​​the image side surface of the first lens; a second positioning member located on the image side of a second lens and in contact with a portion of the image side surface of the second lens, which may abut against a non-optical area of ​​the image side surface of the second lens; a third positioning member located on the image side of a third lens and in contact with a portion of the image side surface of the third lens, which may abut against a non-optical area of ​​the image side surface of the third lens; a fourth positioning member located on the image side of a fourth lens and in contact with a portion of the image side surface of the fourth lens, which may abut against a non-optical area of ​​the image side surface of the fourth lens; and a fifth positioning member located on the image side of a fifth lens and in contact with a portion of the image side surface of the fifth lens, which may abut against the image side surface of the fifth lens. For example, the first positioning member may contact a non-optical region on the image-side of the first lens and simultaneously contact a non-optical region on the object-side of the second lens. For instance, the object-side of the first positioning member may contact a non-optical region on the image-side of the first lens, and the image-side of the first positioning member may contact a non-optical region on the object-side of the second lens.

[0047] A photographic lens according to an exemplary embodiment of this application may include a lens barrel housing a lens group and a plurality of positioning members. For example, as... Figure 1A and Figure 1B As shown, the lens barrel can be a one-piece lens barrel used to house the first to fifth lenses and the first to fourth positioning members. For example, as... Figure 1C As shown, the lens barrel can accommodate the first to fifth lenses and the first to fifth positioning members.

[0048] According to an exemplary embodiment of this application, the positioning element may include at least one spacer. By reasonably setting the number, thickness, inner diameter, and outer diameter of the spacers, it is beneficial to improve the assembly of the camera lens, to block stray light, and to improve the imaging quality of the camera lens.

[0049] In one exemplary embodiment, the image-side surface of the fifth lens is concave. The photographic lens according to this application satisfies: (D4m+d4m) / (D4m-d4m)×|R9 / R8|>33, where d4m is the inner diameter of the image-side surface of the fourth positioning member, D4m is the outer diameter of the image-side surface of the fourth positioning member, R8 is the radius of curvature of the image-side surface of the fourth lens, and R9 is the radius of curvature of the object-side surface of the fifth lens. In this application, by rationally configuring the five lenses, the image-side surface shape of the fifth lens, at least one positioning member, and the lens barrel, and combining (D4m+d4m) / (D4m-d4m)×|R9 / R8|>33, it is beneficial to give the photographic lens characteristics such as telephoto capability and less stray light. For example, by rationally combining the lens barrel, the number and structure of the lenses, and the positioning member, this application facilitates the design of a lens with telephoto characteristics. Based on this, by reasonably setting the curvature radius of the image side of the fourth lens and the curvature radius of the object side of the fifth lens, it is beneficial to control the shape of the fourth and fifth lenses, which can effectively control the overall light deflection angle of the lens, reduce the overall aberration and ghosting of the lens, and enable the photographic lens to have high image quality. By reasonably setting the outer and inner diameters of the image side of the fourth positioning component, the risk of stray light can be effectively avoided, and the interference of stray light on the image quality can be reduced.

[0050] In another exemplary embodiment, the image-side surface of the fifth lens is concave. The photographic lens according to this application satisfies: 45mm. 2 <π×(D3s^2-d3s^2)<69mm 2 Where D3s is the outer diameter of the object-side surface of the third positioning element, and d3s is the inner diameter of the object-side surface of the third positioning element. In this application, through the above-mentioned reasonable arrangement of the five lenses, the image-side surface shape of the fifth lens, at least one positioning element, and the lens barrel, and combined with 45mm... 2 <π×(D3s^2-d3s^2)<69mm 2 This allows for the creation of photographic lenses with characteristics such as telephoto capabilities and reduced stray light. For example, this application, through the rational combination of the lens barrel, the number and structure of the lenses, and the positioning components, facilitates the design of a lens with telephoto characteristics. Furthermore, by rationally setting the outer and inner diameters of the third positioning component, the feasibility of its fabrication and its bearing area are improved, thereby increasing the stability of adjacent components such as the third and fourth lenses. In addition, by rationally setting the inner diameter of the third positioning component, excess stray light in the lens can be reduced without affecting lens performance, thus improving the lens's imaging effect.

[0051] In an exemplary embodiment, the photographic lens according to this application satisfies: 0 < (CP5 + CP4) / ∑CT < 0.3, where ∑CT is the sum of the center thicknesses of the first to fifth lenses along the optical axis, CP5 is the maximum thickness of the fifth positioning member, and CP4 is the maximum thickness of the fourth positioning member. By satisfying 0 < (CP5 + CP4) / ∑CT < 0.3, the axial dimension of the lens can be minimized while ensuring that the lens performance and main parameters meet design requirements and that each lens meets processing requirements. This reduces the space ratio of the lens structure, saves materials, and significantly lowers product costs.

[0052] In an exemplary embodiment, the photographic lens according to this application satisfies: 3.7 < 1 / tan(Semi-FOV) × d0s / EPD < 4.2, where d0s is the inner diameter of the object-side end of the lens barrel, Semi-FOV is half of the maximum field of view of the photographic lens, and EPD is the entrance pupil diameter of the photographic lens. By satisfying 3.7 < 1 / tan(Semi-FOV) × d0s / EPD < 4.2, the photographic lens can have a larger aperture by reasonably allocating the object-side end size of the lens barrel, the entrance pupil diameter, and the field of view, thereby providing sufficient light transmission to improve the brightness of the captured image and enable the lens to maintain good shooting performance even in low-light environments.

[0053] In an exemplary embodiment, the image-side surface of the fifth lens rests against the image-side end of the lens barrel. The photographic lens according to this application satisfies: D1s > D2s > D3s, where D1s is the outer diameter of the object-side surface of the first positioning member, D2s is the outer diameter of the object-side surface of the second positioning member, and D3s is the outer diameter of the object-side surface of the third positioning member. Satisfying D1s > D2s > D3s allows for the reasonable setting of the outer diameter of the positioning members to match the size of the lens barrel. During the assembly of each positioning member and lens from the object-side end of the lens barrel, the outer diameter of each assembled component can match the inner diameter of the lens barrel, improving stability during assembly and thus contributing to increased yield and production efficiency of the lens products.

[0054] In an exemplary embodiment, the photographic lens according to this application satisfies: 0.3 < D5s / d5s×(f5-f4) / (f5+f4) < 4, where D5s is the outer diameter of the object-side surface of the fifth positioning member, d5s is the inner diameter of the object-side surface of the fifth positioning member, f4 is the effective focal length of the fourth lens, and f5 is the effective focal length of the fifth lens. Satisfying 0.3 < D5s / d5s×(f5-f4) / (f5+f4) < 4 allows for a reasonable distribution of the optical power of the fourth and fifth lenses by setting their effective focal lengths, thereby reducing lens aberration. Simultaneously, it allows for reasonable control of the convergence of image-side light rays, enabling better adaptation between the image-side light rays and the light receiver on the imaging surface.

[0055] In an exemplary embodiment, the photographic lens according to this application satisfies: 0.3 < CP4 / T45 < 12, where T45 is the air gap between the fourth and fifth lenses on the optical axis, and CP4 is the maximum thickness of the fourth positioning component. Satisfying 0.3 < CP4 / T45 < 12 ensures that the fourth and fifth lenses do not interfere with each other during assembly by appropriately setting the air gap on the optical axis, and also allows for reasonable control of the step difference between the fourth and fifth lenses by appropriately setting the ratio of the air gap to their edge distance (i.e., the maximum thickness of the fourth positioning component), thus ensuring the manufacturability of the fourth positioning component and its stability during assembly.

[0056] In an exemplary embodiment, the photographic lens according to this application satisfies: 8 < (f × f) / (∑AT × L) < 14, where f is the total effective focal length of the photographic lens, L is the maximum length of the lens barrel, i.e., L is the distance between the object-side end and the image-side end of the lens barrel along the optical axis, and ∑AT is the sum of the air gaps between any two adjacent lenses among the first to fifth lenses along the optical axis. By satisfying 8 < (f × f) / (∑AT × L) < 14, the optical power of each lens can be rationally distributed by reasonably setting the relationship between the length of the lens barrel, the sum of the air gaps between adjacent lenses, and the total effective focal length of the lens. This ensures that all lenses can be accommodated with a relatively small lens barrel length, thereby facilitating the overall miniaturization of the lens and improving its practicality.

[0057] In an exemplary embodiment, the photographic lens according to this application satisfies: -33 < R6 / R7 × (EP34 / CP3) < -18, where R6 is the radius of curvature of the image-side surface of the third lens, R7 is the radius of curvature of the object-side surface of the fourth lens, EP34 is the distance between the image-side surface of the third positioning member and the object-side surface of the fourth positioning member along the optical axis, and CP3 is the maximum thickness of the third positioning member. Satisfying -33 < R6 / R7 × (EP34 / CP3) < -18 allows for improved manufacturability of the third and fourth lenses, reduced optical sensitivity, and reduced yield loss due to assembly tolerance fluctuations during assembly, thereby ensuring the stability of the photographic lens's imaging quality, by reasonably setting the radii of curvature of the image-side surface of the third lens and the object-side surface of the fourth lens.

[0058] In an exemplary embodiment, among the inner diameters of the object-side and image-side surfaces of the first, second, third, fourth, and fifth positioning elements, the inner diameter of the object-side surface of the third positioning element is the smallest. The photographic lens according to this application satisfies: 1.4 < d0s / d3s < 1.7, where d0s is the inner diameter of the object-side end of the lens barrel, and d3s is the inner diameter of the object-side surface of the third positioning element. Satisfying 1.4 < d0s / d3s < 1.7 allows for the control of the assembly step difference between multiple components by reasonably setting the ratio of the inner diameter of the object-side end of the lens barrel to the inner diameter of the object-side surface of the third positioning element. This reduces component deformation caused by deviations in component bearing positions during assembly, improves lens yield and imaging quality, and also reduces the spacing of the positioning elements in the vertical axis direction, which is beneficial for locating stray light and intercepting stray light, thus improving imaging performance.

[0059] In an exemplary embodiment, the photographic lens according to this application further includes an aperture stop disposed between the object side and the first lens. Optionally, the photographic lens may also include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface. This application proposes a photographic lens with characteristics such as long focal length, miniaturization, low stray light, high stability, high yield, and high imaging quality. The photographic lens according to the above embodiments of this application can employ multiple lenses, such as the five lenses mentioned above. By rationally allocating the optical power, surface shape, material, center thickness of each lens, and on-axis spacing between each lens, incident light can be effectively converged, the overall optical length of the imaging lens can be reduced, and the manufacturability of the imaging lens can be improved, making the photographic lens more conducive to production and processing. In the photographic lens of the above embodiments of this application, by setting a positioning member between adjacent lenses and designing the inner and outer diameters of the positioning member according to the optical path, stray light can be effectively blocked and eliminated, improving the imaging quality of the lens.

[0060] In embodiments of this application, at least one of the mirror surfaces of each lens is an aspherical mirror surface; that is, at least one mirror surface from the object-side surface of the first lens to the image-side surface of the fifth lens is an aspherical mirror surface. An aspherical lens is characterized by a continuously changing curvature from the lens center to the lens periphery. Unlike a spherical lens, which has a constant curvature from the lens center to the lens periphery, an aspherical lens has better curvature radius characteristics, offering advantages in improving distortion aberrations and astigmatism. By using an aspherical lens, aberrations occurring during imaging can be eliminated as much as possible, thereby improving image quality. Optionally, at least one of the object-side and image-side surfaces of each of the first, second, third, fourth, and fifth lenses is an aspherical mirror surface. Optionally, both the object-side and image-side surfaces of each of the first, second, third, fourth, and fifth lenses are aspherical mirror surfaces.

[0061] However, those skilled in the art will understand that the number of lenses constituting the photographic lens can be varied to obtain the various results and advantages described herein without departing from the technical solutions claimed in this application. For example, although five lenses are described as an example in the embodiments, the photographic lens is not limited to including five lenses. If desired, the photographic lens may also include other numbers of lenses.

[0062] The following describes in further detail, with reference to the accompanying drawings, specific embodiments of the photographic lens applicable to the above-described embodiments.

[0063] Example 1

[0064] The following is for reference Figures 1A to 2C A photographic lens according to Embodiment 1 of this application is described. Figures 1A to 1C The photographic lenses in three different implementations of Example 1 are shown respectively.

[0065] like Figures 1A to 1C As shown, the camera lens, from the object side to the image side, includes, in sequence: aperture 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).

[0066] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being convex. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has positive 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 surface S13.

[0067] Table 1 shows the basic parameters of the photographic lens of Example 1, where the units for radius of curvature, thickness / distance, and focal length are millimeters (mm).

[0068]

[0069] Table 1

[0070] In this example, the semi-FOV (half of the maximum field of view) of the camera lens is 14.5°, the entrance pupil diameter (EPD) of the camera lens is 4.69 mm, and the total effective focal length (f) of the camera lens is 14.88 mm.

[0071] like Figure 1A and Figure 1B As shown, the camera lens may include four positioning components: a first positioning component P1, a second positioning component P2, a third positioning component P3, and a fourth positioning component P4. The lens barrel P0 can accommodate the first lens E1 to the fifth lens E5 and the first positioning components P1 to the fourth positioning components P4.

[0072] like Figure 1C As shown, the camera lens may include five positioning elements: a first positioning element P1, a second positioning element P2, a third positioning element P3, a fourth positioning element P4, and a fifth positioning element P5. The lens barrel P0 can accommodate the first lens E1 to the fifth lens E5, as well as the first positioning elements P1 to the fifth positioning elements P5.

[0073] Table 2 shows the basic parameters of each positioning component under three implementation methods in the photographic lens of Embodiment 1, wherein the unit of each structural parameter is millimeters (mm).

[0074] Structural parameters Implementation Method 1 Implementation Method 2 Implementation Method 3 D4m 4.72 4.72 5.52 d4m 4.28 4.24 4.72 CP5 / / 0.45 d0s 5.59 5.65 4.69 D3s 4.98 4.98 5.62 d3s 3.16 3.16 3.16 D5s / / 5.68 d5s / / 5.11 CP4 0.58 0.58 0.58 L 7.50 7.50 7.50 EP34 0.39 0.39 0.39 CP3 0.02 0.02 0.02

[0075] Table 2

[0076] It should be understood that this example only exemplifies the structure and parameters of each positioning element under three implementation methods, and does not explicitly limit the specific structure and actual parameters of each positioning element. In actual production, the specific structure and actual parameters of each positioning element can be set in any suitable manner.

[0077] In Embodiment 1, the object-side surface and image-side surface of any one of the first lens E1 to the fifth lens E5 are aspherical surfaces, and the surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0078]

[0079] 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 .

[0080] Face number A4 A6 A8 A10 A12 A14 A16 S1 -7.0863E-04 4.3520E-05 -5.3090E-04 9.1319E-04 -1.0865E-03 9.1016E-04 -5.5009E-04 S2 6.3185E-03 -1.3011E-02 1.9413E-02 -1.4849E-02 2.8955E-03 5.3703E-03 -6.0895E-03 S3 7.7105E-03 -1.5036E-02 2.1138E-02 -8.4936E-03 -1.5597E-02 2.9547E-02 -2.5561E-02 S4 6.5150E-03 -5.2710E-03 8.6189E-03 3.3499E-03 -3.3375E-02 6.2699E-02 -6.8478E-02 S5 2.1159E-03 1.3724E-02 -5.7617E-02 2.4277E-01 -6.4765E-01 1.1464E+00 -1.4015E+00 S6 -1.1629E-03 2.0538E-02 -9.0740E-02 3.7654E-01 -1.0114E+00 1.8370E+00 -2.3281E+00 S7 1.7008E-02 -2.3842E-02 2.9938E-02 -9.0743E-02 2.5712E-01 -5.0031E-01 6.7035E-01 S8 1.5624E-02 -2.6698E-02 2.6600E-02 -2.5144E-02 3.6891E-02 -5.8681E-02 6.8668E-02 S9 -3.2827E-02 -1.3097E-02 4.0783E-02 -6.4876E-02 8.5061E-02 -8.7861E-02 6.8350E-02 S10 -3.6223E-02 8.0760E-03 2.9403E-03 -1.6412E-02 2.8154E-02 -2.9470E-02 2.0803E-02

[0081] Table 3-1

[0082] Face number A18 A20 A22 A24 A26 A28 A30 S1 2.4072E-04 -7.5750E-05 1.6876E-05 -2.5869E-06 2.5890E-07 -1.5208E-08 3.9732E-10 S2 3.3780E-03 -1.1891E-03 2.8159E-04 -4.4962E-05 4.6613E-06 -2.8414E-07 7.7448E-09 S3 1.3902E-02 -5.1313E-03 1.3111E-03 -2.2941E-04 2.6310E-05 -1.7858E-06 5.4458E-08 S4 5.0118E-02 -2.5676E-02 9.2778E-03 -2.3229E-03 3.8395E-04 -3.7694E-05 1.6643E-06 S5 1.2095E+00 -7.4265E-01 3.2243E-01 -9.6699E-02 1.9047E-02 -2.2159E-03 1.1532E-04 S6 2.0950E+00 -1.3458E+00 6.1234E-01 -1.9251E-01 3.9715E-02 -4.8300E-03 2.6201E-04 S7 -6.3107E-01 4.2133E-01 -1.9885E-01 6.4978E-02 -1.4000E-02 1.7887E-03 -1.0253E-04 S8 -5.4889E-02 2.9961E-02 -1.1215E-02 2.8546E-03 -4.7653E-04 4.7468E-05 -2.1517E-06 S9 -3.9159E-02 1.6228E-02 -4.7620E-03 9.5910E-04 -1.2565E-04 9.6238E-06 -3.2660E-07 S10 -1.0254E-02 3.5636E-03 -8.6741E-04 1.4436E-04 -1.5616E-05 9.8740E-07 -2.7644E-08

[0083] Table 3-2

[0084] Figure 2A The on-axis chromatic aberration curve of the photographic 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 camera 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 Embodiment 1 is shown, representing the distortion magnitude corresponding to different field of view angles. According to... Figures 2A to 2C It can be seen that the optical imaging lens given in Example 1 can achieve good imaging quality.

[0085] Example 2

[0086] The following is for reference Figures 3A to 4C A photographic lens according to Embodiment 2 of this application is described. In this embodiment and the following embodiments, for the sake of brevity, descriptions similar to those in Embodiment 1 will be omitted. Figures 3A to 3CThe photographic lenses in three different implementations of Example 1 are shown respectively.

[0087] like Figures 3A to 3C As shown, the camera lens, from the object side to the image side, includes, in sequence: aperture 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).

[0088] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being convex. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being concave 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.

[0089] In this example, the semi-FOV (half of the maximum field of view) of the camera lens is 14.5°, the entrance pupil diameter (EPD) of the camera lens is 4.75mm, and the total effective focal length (f) of the camera lens is 14.88mm.

[0090] like Figure 3A and Figure 3B As shown, the camera lens may include four positioning components: a first positioning component P1, a second positioning component P2, a third positioning component P3, and a fourth positioning component P4. The lens barrel P0 can accommodate the first lens E1 to the fifth lens E5 and the first positioning components P1 to the fourth positioning components P4.

[0091] like Figure 3C As shown, the camera lens may include five positioning elements: a first positioning element P1, a second positioning element P2, a third positioning element P3, a fourth positioning element P4, and a fifth positioning element P5. The lens barrel P0 can accommodate the first lens E1 to the fifth lens E5, as well as the first positioning elements P1 to the fifth positioning elements P5.

[0092] It should be understood that this example only exemplifies the structure and parameters of each positioning element under three implementation methods, and does not explicitly limit the specific structure and actual parameters of each positioning element. In actual production, the specific structure and actual parameters of each positioning element can be set in any suitable manner.

[0093] Table 4 shows the basic parameters of the photographic 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 positioning component under the three implementations of the photographic lens of Embodiment 2, wherein the units of each structural parameter are all millimeters (mm). Tables 6-1 and 6-2 show the higher-order coefficients that can be used for each aspherical mirror surface in Embodiment 2, wherein each aspherical surface shape can be defined by formula (1) given in Embodiment 1 above.

[0094]

[0095] Table 4

[0096]

[0097]

[0098] Table 5

[0099] Face number A4 A6 A8 A10 A12 A14 A16 S1 -6.2078E-04 -4.3809E-04 5.3984E-04 -5.9219E-04 5.0030E-04 -3.3791E-04 1.7282E-04 S2 1.0611E-02 -3.4909E-02 8.8910E-02 -1.3683E-01 1.3711E-01 -9.4424E-02 4.6170E-02 S3 1.2165E-02 -3.8896E-02 9.9917E-02 -1.5387E-01 1.5106E-01 -9.8632E-02 4.3333E-02 S4 8.5403E-03 -1.6184E-02 5.8554E-02 -1.3789E-01 2.2766E-01 -2.7720E-01 2.5321E-01 S5 1.0806E-02 7.9789E-03 -5.2613E-02 2.2490E-01 -5.8827E-01 1.0182E+00 -1.2197E+00 S6 7.9038E-03 2.8723E-02 -1.7922E-01 7.4104E-01 -1.9757E+00 3.5882E+00 -4.5800E+00 S7 -5.3529E-04 1.8539E-02 -1.1831E-01 3.4678E-01 -7.1286E-01 1.0849E+00 -1.2271E+00 S8 8.8560E-03 -8.4353E-03 -2.6267E-02 7.7222E-02 -1.2043E-01 1.5188E-01 -1.5796E-01 S9 -1.7498E-02 -2.4922E-02 5.9923E-02 -1.3470E-01 2.4197E-01 -2.9260E-01 2.3812E-01 S10 -2.5410E-02 -2.9181E-03 2.4932E-02 -5.9429E-02 8.8915E-02 -8.9155E-02 6.2075E-02

[0100] Table 6-1

[0101] Face number A18 A20 A22 A24 A26 A28 A30 S1 -6.4053E-05 1.6795E-05 -3.0537E-06 3.7335E-07 -2.8989E-08 1.2726E-09 -2.3483E-11 S2 -1.6293E-02 4.1620E-03 -7.6143E-04 9.7059E-05 -8.1620E-06 4.0536E-07 -8.9549E-09 S3 -1.2449E-02 2.0529E-03 -6.5420E-05 -5.0183E-05 1.1469E-05 -1.1021E-06 4.1994E-08 S4 -1.7322E-01 8.7680E-02 -3.2175E-02 8.2864E-03 -1.4163E-03 1.4403E-04 -6.5885E-06 S5 1.0345E+00 -6.2611E-01 2.6870E-01 -7.9881E-02 1.5642E-02 -1.8147E-03 9.4471E-05 S6 4.1758E+00 -2.7312E+00 1.2707E+00 -4.1029E-01 8.7343E-02 -1.1019E-02 6.2389E-04 S7 1.0250E+00 -6.2610E-01 2.7520E-01 -8.4551E-02 1.7212E-02 -2.0855E-03 1.1390E-04 S8 1.2404E-01 -6.9595E-02 2.7168E-02 -7.1801E-03 1.2225E-03 -1.2084E-04 5.2620E-06 S9 -1.3374E-01 5.2545E-02 -1.4390E-02 2.6834E-03 -3.2330E-04 2.2545E-05 -6.8498E-07 S10 -3.0653E-02 1.0816E-02 -2.7094E-03 4.7068E-04 -5.3916E-05 3.6628E-06 -1.1180E-07

[0102] Table 6-2

[0103] Figure 4A The on-axis chromatic aberration curve of the camera lens of Embodiment 2 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 4B The astigmatism curve of the camera lens of Embodiment 2 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 4C The distortion curve of the optical imaging lens of Example 2 is shown, representing the distortion magnitude corresponding to different field of view angles. According to... Figures 4A to 4C It can be seen that the optical imaging lens given in Example 2 can achieve good imaging quality.

[0104] Example 3

[0105] The following is for reference Figures 5A to 6C Describes a photographic lens according to Embodiment 3 of this application. Figures 5A to 5C The photographic lenses in three different implementations of Example 3 are shown respectively.

[0106] like Figures 5A to 5C As shown, the camera lens, from the object side to the image side, includes, in sequence: aperture 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).

[0107] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being convex. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being concave 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.

[0108] In this example, the semi-FOV (half of the maximum field of view) of the camera lens is 14.5°, the entrance pupil diameter (EPD) of the camera lens is 4.74 mm, and the total effective focal length (f) of the camera lens is 14.84 mm.

[0109] like Figure 5A and Figure 5B As shown, the camera lens may include four positioning components: a first positioning component P1, a second positioning component P2, a third positioning component P3, and a fourth positioning component P4. The lens barrel P0 can accommodate the first lens E1 to the fifth lens E5 and the first positioning components P1 to the fourth positioning components P4.

[0110] like Figure 5C As shown, the camera lens may include five positioning elements: a first positioning element P1, a second positioning element P2, a third positioning element P3, a fourth positioning element P4, and a fifth positioning element P5. The lens barrel P0 can accommodate the first lens E1 to the fifth lens E5, as well as the first positioning elements P1 to the fifth positioning elements P5.

[0111] It should be understood that this example only exemplifies the structure and parameters of each positioning element under three implementation methods, and does not explicitly limit the specific structure and actual parameters of each positioning element. In actual production, the specific structure and actual parameters of each positioning element can be set in any suitable manner.

[0112] Table 7 shows the basic parameters of the photographic lens of Embodiment 3, wherein the units of radius of curvature, thickness / distance, and focal length are all millimeters (mm). Table 8 shows the basic parameters of each positioning element in the three embodiments of the photographic lens of Embodiment 3, wherein the units of each structural parameter are all millimeters (mm). Tables 9-1 and 9-2 show the higher-order coefficients that can be used for each aspherical mirror in Embodiment 3, wherein each aspherical surface shape can be defined by formula (1) given in Embodiment 1 above.

[0113]

[0114]

[0115] Table 7

[0116] Structural parameters Implementation Method 1 Implementation Method 2 Implementation Method 3 D4m 4.90 4.92 5.66 d4m 4.24 3.65 3.71 CP5 / / 0.45 d0s 5.59 5.59 4.75 D3s 4.98 4.98 5.62 d3s 3.14 3.14 3.14 D5s / / 5.74 d5s / / 4.40 CP4 0.02 0.02 0.02 L 7.50 7.50 7.50 EP34 0.42 0.63 0.72 CP3 0.02 0.02 0.02

[0117] Table 8

[0118] Face number A4 A6 A8 A10 A12 A14 A16 S1 -6.7697E-04 -2.5024E-04 2.7274E-04 -1.8239E-04 1.3735E-05 5.1589E-05 -3.5928E-05 S2 8.8239E-04 8.1152E-03 -7.1308E-04 -2.5212E-02 4.6274E-02 -4.4128E-02 2.7019E-02 S3 2.9895E-03 4.8983E-03 1.0046E-02 -4.9311E-02 7.8809E-02 -7.2342E-02 4.3390E-02 S4 7.6229E-03 -6.8609E-03 3.4635E-02 -9.8137E-02 1.7280E-01 -2.0768E-01 1.7898E-01 S5 1.0797E-02 6.7436E-03 -4.4192E-02 1.8360E-01 -4.6423E-01 7.7400E-01 -8.9152E-01 S6 8.7863E-03 1.5966E-02 -1.0401E-01 4.4637E-01 -1.2091E+00 2.2064E+00 -2.8105E+00 S7 -2.7624E-03 3.4600E-02 -1.9444E-01 5.6208E-01 -1.1326E+00 1.6751E+00 -1.8403E+00 S8 4.1282E-04 5.8795E-02 -2.6166E-01 5.5984E-01 -7.6850E-01 7.4837E-01 -5.4017E-01 S9 -2.9542E-02 5.1286E-02 -1.9974E-01 3.9559E-01 -4.7734E-01 3.8980E-01 -2.2622E-01 S10 -2.9261E-02 4.4138E-03 8.4145E-03 -3.4139E-02 6.3278E-02 -7.1394E-02 5.3603E-02

[0119] Table 9-1

[0120]

[0121]

[0122] Table 9-2

[0123] Figure 6A The on-axis chromatic aberration curve of the camera lens of Embodiment 3 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 6B The astigmatism curve of the camera lens of Embodiment 3 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 6C The distortion curve of the optical imaging lens of Example 3 is shown, representing the distortion magnitude corresponding to different field of view angles. According to... Figures 6A to 6C It can be seen that the optical imaging lens given in Example 3 can achieve good imaging quality.

[0124] In summary, Examples 1 to 3 satisfy the relationships shown in Tables 10-1, 10-2 and 10-3, respectively.

[0125]

[0126] Table 10-1

[0127]

[0128]

[0129] Table 10-2

[0130]

[0131] Table 10-3

[0132] This application also provides an imaging device, whose electronic photosensitive element can be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device can be a stand-alone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the photographic lens described above.

[0133] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A camera lens, characterized in that, include: The lens group, along the optical axis from the object side to the image side, sequentially includes a first lens with positive optical power, a second lens with negative optical power, a third lens with negative optical power, a fourth lens with positive optical power, and a fifth lens with optical power. The object side and image side of the first lens are both convex; the object side and image side of the second lens are both convex and concave; the object side and image side of the third lens are both convex and concave; the object side and image side of the fourth lens are both concave and convex; and the image side of the fifth lens is concave. At least one positioning element includes: a third positioning element located on the image side of the third lens and in contact with a portion of the image side surface of the third lens; a fourth positioning element located on the image side of the fourth lens and in contact with a portion of the image side surface of the fourth lens; and a fifth positioning element located on the image side of the fifth lens and in contact with a portion of the image side surface of the fifth lens; and A lens barrel for housing the lens group and the at least one positioning element; The number of lenses with optical power in the photographic lens is five; The photographic lens satisfies the following conditions: 34.22≤(D4m+d4m) / (D4m-d4m)×|R9 / R8|≤1445.03, -32.07≤R6 / R7×(EP34 / CP3)≤-18.89, and 0.37≤D5s / d5s×(f5-f4) / (f5+f4)≤3.78, where d4m is the inner diameter of the image-side surface of the fourth positioning element, D4m is the outer diameter of the image-side surface of the fourth positioning element, R8 is the radius of curvature of the image-side surface of the fourth lens, and R9 is the outer diameter of the fourth positioning element. The radius of curvature of the object side of the fifth lens, R6 is the radius of curvature of the image side of the third lens, R7 is the radius of curvature of the object side of the fourth lens, EP34 is the distance between the image side of the third positioning member and the object side of the fourth positioning member along the optical axis, CP3 is the maximum thickness of the third positioning member, D5s is the outer diameter of the object side of the fifth positioning member, d5s is the inner diameter of the object side of the fifth positioning member, f4 is the effective focal length of the fourth lens, and f5 is the effective focal length of the fifth lens.

2. The photographic lens according to claim 1, characterized in that, The at least one positioning element further includes: A first positioning element located on the image side of the first lens and in contact with the image side surface of the first lens; A second positioning element located on the image side of the second lens and in contact with the image side surface of the second lens; The photographic lens satisfies: D1s > D2s > D3s, where D1s is the outer diameter of the object side of the first positioning member, D2s is the outer diameter of the object side of the second positioning member, and D3s is the outer diameter of the object side of the third positioning member.

3. The photographic lens according to claim 2, characterized in that, The photographic lens satisfies: 0 < (CP5 + CP4) / ∑CT < 0.3, where ∑CT is the sum of the center thicknesses of the first lens to the fifth lens on the optical axis, CP5 is the maximum thickness of the fifth positioning element, and CP4 is the maximum thickness of the fourth positioning element.

4. The photographic lens according to claim 2, characterized in that, The camera lens meets the following requirements: 46.46 mm 2 ≤π×(D3s^2-d3s^2)≤68.92 mm 2 Wherein, D3s is the outer diameter of the object side of the third positioning member, and d3s is the inner diameter of the object side of the third positioning member.

5. The photographic lens according to claim 3, characterized in that, Among the inner diameters of the object-side and image-side surfaces of the first, second, third, fourth, and fifth positioning elements, the inner diameter of the object-side surface of the third positioning element is the smallest; and The photographic lens satisfies: 1.48≤d0s / d3s≤1.62, where d0s is the inner diameter of the object-side end of the lens barrel and d3s is the inner diameter of the object-side surface of the third positioning member.

6. The photographic lens according to any one of claims 1-5, characterized in that, The image-side surface of the fifth lens rests against the image-side end of the lens barrel.

7. The photographic lens according to any one of claims 1-5, characterized in that, The photographic lens satisfies: 3.86≤1 / tan(Semi-FOV)×d0s / EPD≤4.13, where d0s is the inner diameter of the object-side end of the lens barrel, Semi-FOV is half of the maximum field of view of the photographic lens, and EPD is the entrance pupil diameter of the photographic lens.

8. The photographic lens according to any one of claims 1-5, characterized in that, The photographic lens satisfies: 0.36≤CP4 / T45≤11.39, where T45 is the air gap between the fourth lens and the fifth lens on the optical axis, and CP4 is the maximum thickness of the fourth positioning element.

9. The photographic lens according to any one of claims 1-5, characterized in that, The photographic lens satisfies: 9.76≤(f×f) / (∑AT×L)≤12.42, where f is the total effective focal length of the photographic lens, L is the maximum length of the lens barrel, and ∑AT is the sum of the air gaps between any two adjacent lenses from the first lens to the fifth lens on the optical axis.

10. A camera lens, characterized in that, include: The lens group, along the optical axis from the object side to the image side, sequentially includes a first lens with positive optical power, a second lens with negative optical power, a third lens with negative optical power, a fourth lens with positive optical power, and a fifth lens with optical power. The object side and image side of the first lens are both convex; the object side and image side of the second lens are both convex and concave; the object side and image side of the third lens are both convex and concave; the object side and image side of the fourth lens are both concave and convex; and the image side of the fifth lens is concave. At least one positioning element includes: a third positioning element located on the image side of the third lens and in contact with a portion of the image side surface of the third lens; a fourth positioning element located on the image side of the fourth lens and in contact with a portion of the image side surface of the fourth lens; and a fifth positioning element located on the image side of the fifth lens and in contact with a portion of the image side surface of the fifth lens; and A lens barrel for housing the lens group and the at least one positioning element; The number of lenses with optical power in the photographic lens is five; The camera lens meets the following requirements: 46.46 mm 2 ≤π×(D3s^2-d3s^2)≤68.92 mm 2 -32.07≤R6 / R7×(EP34 / CP3)≤-18.89 and 0.37≤D5s / d5s×(f5-f4) / (f5+f4)≤3.78, where D3s is the outer diameter of the object-side surface of the third positioning member, d3s is the inner diameter of the object-side surface of the third positioning member, R6 is the radius of curvature of the image-side surface of the third lens, R7 is the radius of curvature of the object-side surface of the fourth lens, EP34 is the distance between the image-side surface of the third positioning member and the object-side surface of the fourth positioning member along the optical axis, CP3 is the maximum thickness of the third positioning member, D5s is the outer diameter of the object-side surface of the fifth positioning member, d5s is the inner diameter of the object-side surface of the fifth positioning member, f4 is the effective focal length of the fourth lens, and f5 is the effective focal length of the fifth lens.

11. The photographic lens according to claim 10, characterized in that, The at least one positioning element further includes: A first positioning member located on the image side of the first lens and in contact with the image side surface of the first lens; and A second positioning element located on the image side of the second lens and in contact with the image side surface of the second lens; The photographic lens satisfies: D1s > D2s > D3s, where D1s is the outer diameter of the object side of the first positioning member, D2s is the outer diameter of the object side of the second positioning member, and D3s is the outer diameter of the object side of the third positioning member.

12. The photographic lens according to claim 11, characterized in that, The photographic lens satisfies: 0 < (CP5 + CP4) / ∑CT < 0.3, where ∑CT is the sum of the center thicknesses of the first lens to the fifth lens on the optical axis, CP5 is the maximum thickness of the fifth positioning element, and CP4 is the maximum thickness of the fourth positioning element.

13. The photographic lens according to claim 12, characterized in that, Among the inner diameters of the object-side and image-side surfaces of the first, second, third, fourth, and fifth positioning elements, the inner diameter of the object-side surface of the third positioning element is the smallest; and The photographic lens satisfies: 1.48≤d0s / d3s≤1.62, where d0s is the inner diameter of the object-side end of the lens barrel and d3s is the inner diameter of the object-side surface of the third positioning member.

14. The photographic lens according to any one of claims 10-13, characterized in that, The image-side surface of the fifth lens rests against the image-side end of the lens barrel.

15. The photographic lens according to any one of claims 10-13, characterized in that, The photographic lens satisfies: 3.86≤1 / tan(Semi-FOV)×d0s / EPD≤4.13, where d0s is the inner diameter of the object-side end of the lens barrel, Semi-FOV is half of the maximum field of view of the photographic lens, and EPD is the entrance pupil diameter of the photographic lens.

16. The photographic lens according to claim 12 or 13, characterized in that, The photographic lens satisfies: 0.36≤CP4 / T45≤11.39, where T45 is the air gap between the fourth lens and the fifth lens on the optical axis.

17. The photographic lens according to any one of claims 10-13, characterized in that, The photographic lens satisfies: 9.76≤(f×f) / (∑AT×L)≤12.42, where f is the total effective focal length of the photographic lens, L is the maximum length of the lens barrel, and ∑AT is the sum of the air gaps between any two adjacent lenses from the first lens to the fifth lens on the optical axis.

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