Optical imaging lens assembly

Abstract

The application provides an optical imaging lens group, comprising a lens barrel, a first lens to a fifth lens accommodated in the lens barrel and a plurality of spacers, wherein the spacer located on the image side of the i-th lens and in contact with the image side surface of the i-th lens is the i-th spacer, i is selected from 1, 2, 3 and 4, the ratio of the curvature radius R8 of the image side surface of the fourth lens to the curvature radius R7 of the object side surface of the fourth lens is greater than zero and satisfies |R7|>|R8|, the air interval T34 of the third lens and the fourth lens on the optical axis of the optical imaging lens group, the central thickness CT4 of the fourth lens on the optical axis, and the distance EP34 between the image side surface of the third spacer and the object side surface of the fourth spacer along the optical axis satisfy (T34+CT4) / EP34<5.0. The application solves the problem of poor assembly stability of the optical imaging lens group in the prior art.

Description

Technical Field

[0001] This invention relates to the field of optical imaging equipment technology, and more specifically, to an optical imaging lens group. Background Technology

[0002] With the development of science and technology, the specifications of optical imaging lens groups in mobile phones have become extremely high. For high-specification mobile phones, the requirements for optical imaging lens groups are becoming increasingly stringent, leading to higher standards. For example, lens architectures using 6, 7, or 8 lenses, while offering improved image quality through optimized optical design, introduce more tolerances with each increase in lens element count, resulting in greater design and assembly complexity and a significant increase in cost. Low-element lens groups offer optical performance comparable to higher-element lenses, with fewer tolerances, lower cost, and wider applicability. However, for low-element lens groups, such as 5-element models, the pursuit of lower costs and fewer tolerances can easily overlook the design considerations for sensitive areas. This can lead to problems such as insufficient lens rigidity and improper space between components, resulting in poor assembly stability and further affecting the overall assembly stability and imaging performance of the imaging lens group.

[0003] In other words, existing optical imaging lens assemblies suffer from poor assembly stability. Summary of the Invention

[0004] The main objective of this invention is to provide an optical imaging lens assembly to solve the problem of poor assembly stability of optical imaging lens assemblies in the prior art.

[0005] To achieve the above objectives, according to one aspect of the present invention, an optical imaging lens group is provided, comprising a lens barrel, a first to a fifth lens housed within the lens barrel, and a plurality of spacers, wherein the spacer located on the image side of the i-th lens and in contact with the image side surface of the i-th lens is the i-th spacer, i being a value taken from 1, 2, 3, and 4, and at least a third spacer and a fourth spacer among the plurality of spacers, wherein the ratio of the radius of curvature R8 of the image side surface of the fourth lens to the radius of curvature R7 of the object side surface of the fourth lens is greater than zero and satisfies |R7|>|R8|, and the air gap T34 between the third and fourth lenses on the optical axis of the optical imaging lens group, the center thickness CT4 of the fourth lens on the optical axis, and the distance EP34 between the image side surface of the third spacer and the object side surface of the fourth spacer along the optical axis satisfy: (T34+CT4) / EP34<5.0.

[0006] Furthermore, the air gap T34 between the third and fourth lenses on the optical axis of the optical imaging lens group, the center thickness CT4 of the fourth lens on the optical axis, and the distance EP34 between the image side of the third spacer and the object side of the fourth spacer along the optical axis satisfy the following condition: 1.0 < (T34 + CT4) / EP34 < 3.0.

[0007] Furthermore, the radius of curvature R2 of the image side of the first lens, the radius of curvature R3 of the object side of the second lens, the inner diameter d1m of the image side of the first spacer, and the inner diameter d2m of the image side of the second spacer satisfy the following condition: (R2+R3) / (d1m+d2m)<10.0.

[0008] Furthermore, the radius of curvature R2 of the image side of the first lens, the radius of curvature R3 of the object side of the second lens, the inner diameter d1m of the image side of the first spacer, and the inner diameter d2m of the image side of the second spacer satisfy the following condition: 2.0 < (R2 + R3) / (d1m + d2m) < 8.0.

[0009] Furthermore, the effective focal length f1 of the first lens of the optical imaging lens group and the effective focal length f2 of the second lens of the optical imaging lens group satisfy: |f1|<|f2|, and the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the outer diameter D1m of the image side of the first spacer, and the outer diameter D2m of the image side of the second spacer satisfy: 2.0<|f1 / D1m|+|f2 / D2m|<9.0.

[0010] Furthermore, the absolute value of the radius of curvature of the image side of the fifth lens in the optical imaging lens group is the smallest among the absolute values ​​of the radius of curvature of the object side and image side of each lens in the optical imaging lens group, and the distance from the image side of the fifth lens to the image side end face of the lens barrel is less than 1 mm.

[0011] Furthermore, the contact area between the object-side surface of the fourth spacer and the image-side surface of the fourth lens is greater than 2.0 mm. 2 The outer diameter D4s of the object side of the fourth spacer, the inner diameter d4s of the object side of the fourth spacer, and the effective focal length f1 of the fourth lens satisfy the following condition: 0.1 < π * [(D4s / 2)] 2 -(d4s / 2) 2 ] / (f4) 2 <15.0.

[0012] Furthermore, the curvature radius R7 of the object side of the fourth lens, the curvature radius R8 of the image side of the fourth lens, the curvature radius R9 of the object side of the fifth lens of the optical imaging lens group, and the curvature radius R10 of the image side of the fifth lens satisfy the following relationship: R7 / R8>R10 / R9.

[0013] Furthermore, the radius of curvature R7 of the object side of the fourth lens, the radius of curvature R8 of the image side of the fourth lens, the outer diameter D4m of the image side of the fourth spacer, and the inner diameter d4m of the image side of the fourth spacer satisfy the following relationship: (D4m+d4m) / (R7+R8)<0.

[0014] Furthermore, the radius of curvature R7 of the object side of the fourth lens, the radius of curvature R8 of the image side of the fourth lens, the outer diameter D4m of the image side of the fourth spacer, and the inner diameter d4m of the image side of the fourth spacer satisfy the following condition: -2.0 < (D4m + d4m) / (R7 + R8) < 0.

[0015] Furthermore, the absolute value of the effective focal length of the fourth lens is less than the absolute value of the effective focal length of the second lens in the optical imaging lens group, and the absolute value of the effective focal length of the fourth lens is less than the absolute value of the effective focal length of the third lens. The effective focal length f4 of the fourth lens, the outer diameter D4s of the object-side surface of the fourth spacer, and the inner diameter d4s of the object-side surface of the fourth spacer satisfy the following relationship: 0.3 <f4 / (D4s-d4s)<4.0。

[0016] Furthermore, the absolute value of the effective focal length of the fifth lens in the optical imaging lens group is less than the absolute value of the effective focal length of the first lens in the optical imaging lens group, the absolute value of the effective focal length of the fifth lens is less than the absolute value of the effective focal length of the second lens in the optical imaging lens group, the absolute value of the effective focal length of the fifth lens is less than the absolute value of the effective focal length of the third lens, and the effective focal length f5 of the fifth lens, the distance EP34 between the image side of the third spacer and the object side of the fourth spacer along the optical axis of the optical imaging lens group, and the maximum thickness CP4 of the fourth spacer satisfy: f5 / (EP34+CP4)<-1.5.

[0017] Furthermore, the absolute value of the effective focal length of the fifth lens in the optical imaging lens group is less than the absolute value of the effective focal length of the first lens in the optical imaging lens group, the absolute value of the effective focal length of the fifth lens is less than the absolute value of the effective focal length of the second lens in the optical imaging lens group, and the absolute value of the effective focal length of the fifth lens is less than the absolute value of the effective focal length of the third lens. The effective focal length f5 of the fifth lens, the distance EP34 between the image-side surface of the third spacer and the object-side surface of the fourth spacer along the optical axis of the optical imaging lens group, and the maximum thickness CP4 of the fourth spacer satisfy the following condition: -2.0. <f5 / (EP34+CP4)<-1.5。

[0018] Furthermore, the outer wall of the lens tube has a stepped surface in the middle, and the center position of the object side of the fourth lens is close to the image side end face of the lens tube relative to the stepped surface along the optical axis of the optical imaging lens group.

[0019] Furthermore, the inner wall surface of the lens barrel has a contact surface that contacts the outer peripheral surface of the fourth lens, and the distance from the contact surface to the outer wall surface of the lens barrel in a direction perpendicular to the optical axis is greater than 0.41 mm.

[0020] According to another aspect of the present invention, an optical imaging lens assembly is provided, comprising a lens barrel, a first to a fifth lens disposed within the lens barrel, and a plurality of spacers, wherein the spacer located on the image side of the i-th lens and in contact with the image side surface of the i-th lens is the i-th spacer, i being a value taken from 1, 2, 3, 4, and at least the plurality of spacers includes a first spacer and a second spacer, wherein the ratio of the radius of curvature R8 of the image side surface of the fourth lens to the radius of curvature R7 of the object side surface of the fourth lens is greater than zero and satisfies |R7|>|R8|, and the radius of curvature R2 of the image side surface of the first lens, the radius of curvature R3 of the object side surface of the second lens, the inner diameter d1m of the image side surface of the first spacer, and the inner diameter d2m of the image side surface of the second spacer satisfy: (R2+R3) / (d1m+d2m)<10.0.

[0021] Furthermore, the radius of curvature R2 of the image side of the first lens, the radius of curvature R3 of the object side of the second lens, the inner diameter d1m of the image side of the first spacer, and the inner diameter d2m of the image side of the second spacer satisfy the following condition: 2.0 < (R2 + R3) / (d1m + d2m) < 8.0.

[0022] Furthermore, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy the condition: |f1|<|f2|. The effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the outer diameter D1m of the image side of the first spacer, and the outer diameter D2m of the image side of the second spacer satisfy the condition: 2.0<|f1 / D1m|+|f2 / D2m|<9.0.

[0023] Furthermore, the absolute value of the radius of curvature of the image side of the fifth lens in the optical imaging lens group is the smallest among the absolute values ​​of the radius of curvature of the object side and image side of each lens in the optical imaging lens group, and the distance from the image side of the fifth lens to the image side end face of the lens barrel is less than 1 mm.

[0024] Furthermore, the contact area between the object-side surface of the fourth spacer and the image-side surface of the fourth lens is greater than 2.0 mm. 2 The outer diameter D4s of the object side of the fourth spacer, the inner diameter d4s of the object side of the fourth spacer, and the effective focal length f1 of the fourth lens satisfy the following condition: 0.1 < π * [(D4s / 2)] 2 -(d4s / 2) 2 ] / (f4) 2 <15.0.

[0025] Furthermore, the curvature radius R7 of the object side of the fourth lens, the curvature radius R8 of the image side of the fourth lens, the curvature radius R9 of the object side of the fifth lens, and the curvature radius R10 of the image side of the fifth lens satisfy the following relationship: R7 / R8>R10 / R9.

[0026] Furthermore, the radius of curvature R7 of the object side of the fourth lens, the radius of curvature R8 of the image side of the fourth lens, the outer diameter D4m of the image side of the fourth spacer, and the inner diameter d4m of the image side of the fourth spacer satisfy the following relationship: (D4m+d4m) / (R7+R8)<0.

[0027] Furthermore, the radius of curvature R7 of the object side of the fourth lens, the radius of curvature R8 of the image side of the fourth lens, the outer diameter D4m of the image side of the fourth spacer, and the inner diameter d4m of the image side of the fourth spacer satisfy the following condition: -2.0 < (D4m + d4m) / (R7 + R8) < 0.

[0028] Furthermore, the absolute value of the effective focal length of the fourth lens is less than the absolute value of the effective focal length of the second lens, and the absolute value of the effective focal length of the fourth lens is less than the absolute value of the effective focal length of the third lens in the optical imaging lens group. The effective focal length f4 of the fourth lens, the outer diameter D4s of the object-side surface of the fourth spacer, and the inner diameter d4s of the object-side surface of the fourth spacer satisfy the following relationship: 0.3 <f4 / (D4s-d4s)<4.0。

[0029] Furthermore, the absolute value of the effective focal length of the fifth lens in the optical imaging lens group is less than the absolute value of the effective focal length of the first lens, the absolute value of the effective focal length of the fifth lens is less than the absolute value of the effective focal length of the second lens, the absolute value of the effective focal length of the fifth lens is less than the absolute value of the effective focal length of the third lens, and the effective focal length f5 of the fifth lens, the distance EP34 between the image side of the third spacer and the object side of the fourth spacer along the optical axis of the optical imaging lens group, and the maximum thickness CP4 of the fourth spacer satisfy: f5 / (EP34+CP4)<-1.5.

[0030] Furthermore, the absolute value of the effective focal length of the fifth lens is less than the absolute value of the effective focal length of the first lens, the absolute value of the effective focal length of the fifth lens is less than the absolute value of the effective focal length of the second lens, and the absolute value of the effective focal length of the fifth lens is less than the absolute value of the effective focal length of the third lens. The effective focal length f5 of the fifth lens, the distance EP34 between the image-side surface of the third spacer and the object-side surface of the fourth spacer along the optical axis, and the maximum thickness CP4 of the fourth spacer satisfy the following condition: -2.0. <f5 / (EP34+CP4)<-1.5。

[0031] Furthermore, the outer wall of the lens tube has a stepped surface in the middle, and the center position of the object side of the fourth lens of the optical imaging lens group is close to the image side end face of the lens tube relative to the stepped surface along the optical axis of the optical imaging lens group.

[0032] Furthermore, the inner wall surface of the lens barrel has a contact surface that contacts the outer peripheral surface of the fourth lens of the optical imaging lens group, and the distance from the contact surface to the outer wall surface of the lens barrel along the direction perpendicular to the optical axis of the optical imaging lens group is greater than 0.41 mm.

[0033] According to the technical solution of the present invention, the optical imaging lens group includes a lens barrel, a first lens to a fifth lens housed in the lens barrel, and a plurality of spacers. The spacer located on the image side of the i-th lens and in contact with the image side surface of the i-th lens is the i-th spacer, where i is taken from 1, 2, 3, and 4. Among the plurality of spacers, there are at least a third spacer and a fourth spacer. The ratio of the radius of curvature R8 of the image side surface of the fourth lens to the radius of curvature R7 of the object side surface of the fourth lens is greater than zero and satisfies |R7|>|R8|. The air gap T34 between the third lens and the fourth lens on the optical axis of the optical imaging lens group, the center thickness CT4 of the fourth lens on the optical axis, and the distance EP34 between the image side surface of the third spacer and the object side surface of the fourth spacer along the optical axis satisfy: (T34+CT4) / EP34<5.0.

[0034] This solution provides a five-element optical imaging lens group. Through the rational design and combination of multiple lenses, spacers, and lens barrels, it achieves optical performance comparable to lenses with a higher number of elements, with fewer tolerances, and a smaller structural size compared to lenses with a higher number of elements. The optical imaging lens group corrects aberrations and reduces lens sensitivity by controlling the ratio of the image-side radius of curvature R8 to the object-side radius of curvature R7 of the fourth lens to be greater than zero and satisfying |R7|>|R8|. Furthermore, it maintains the parameter relationship (T34+CT4) / EP34 between the air gap T34 between the third and fourth lenses on the optical axis, the center thickness CT4 of the fourth lens on the optical axis, and the distance EP34 between the image-side and object-side surfaces of the third and fourth spacers along the optical axis within a reasonable range. This improves the poor assembly stability caused by insufficient lens rigidity and unreasonable space between components, resulting in more stable image formation and facilitating field curvature adjustment and improved performance of the optical imaging lens group. Attached Figure Description

[0035] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0036] Figure 1 A schematic diagram of the structure of an optical imaging lens group according to an optional embodiment of the present invention is shown;

[0037] Figure 2 A schematic diagram of the optical imaging lens group of Example 1 of the present invention in a first state is shown;

[0038] Figure 3 A schematic diagram of the optical imaging lens group of Example 1 of the present invention in a second state is shown;

[0039] Figure 4 A schematic diagram of the optical imaging lens group of Example 1 of the present invention in a third state is shown;

[0040] Figures 5 to 8 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of Example 1 of the present invention are shown respectively.

[0041] Figure 9 A schematic diagram of the optical imaging lens group of Example 2 of the present invention in a first state is shown;

[0042] Figure 10 A schematic diagram of the optical imaging lens group of Example 2 of the present invention in a second state is shown;

[0043] Figures 11 to 14 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of Example 2 of the present invention are shown respectively.

[0044] Figure 15 A schematic diagram of the optical imaging lens group of Example 3 of the present invention in a first state is shown;

[0045] Figure 16 A schematic diagram of the optical imaging lens group of Example 3 of the present invention in a second state is shown;

[0046] Figures 17 to 20 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of Example 3 of the present invention are shown respectively.

[0047] The above figures include the following reference numerals:

[0048] 10. Lens tube; 11. Stepped surface; 12. Contact surface; E1. First lens; S1. Object-side surface of the first lens; S2. Image-side surface of the first lens; P1. First spacer; E2. Second lens; S3. Object-side surface of the second lens; S4. Image-side surface of the second lens; P2. Second spacer; E3. Third lens; S5. Object-side surface of the third lens; S6. Image-side surface of the third lens; P3. Third spacer; E4. Fourth lens; S7. Object-side surface of the fourth lens; S8. Image-side surface of the fourth lens; P4. Fourth spacer; P4b. Fourth auxiliary spacer; E5. Fifth lens; S9. Object-side surface of the fifth lens; S10. Image-side surface of the fifth lens. Detailed Implementation

[0049] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0050] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0051] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0052] 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.

[0053] 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 strictly to scale.

[0054] In this paper, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of that 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 that concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The determination of the surface shape in the paraxial region can be based on the judgment method commonly used by those knowledgeable in the field, using the R value (R refers to the radius of curvature of the paraxial region, usually the R value in the lens data in optical software) to determine convexity or concavity. For the object side, a positive R value indicates a convex surface, and a negative R value indicates a concave surface; for the image side, a positive R value indicates a concave surface, and a negative R value indicates a convex surface.

[0055] To address the problem of poor assembly stability of optical imaging lens assemblies in existing technologies, this invention provides an optical imaging lens assembly.

[0056] Example 1

[0057] like Figures 1 to 20 As shown, the optical imaging lens group includes a lens barrel 10, a first to a fifth lens housed within the lens barrel 10, and a plurality of spacers. The spacer located on the image side of the i-th lens and in contact with the image side of the i-th lens is the i-th spacer, where i is a value taken from 1, 2, 3, and 4. Among the plurality of spacers, there are at least a third spacer and a fourth spacer. The ratio of the radius of curvature R8 of the image side of the fourth lens to the radius of curvature R7 of the object side of the fourth lens is greater than zero and satisfies |R7|>|R8|. The air gap T34 between the third and fourth lenses on the optical axis of the optical imaging lens group, the center thickness CT4 of the fourth lens on the optical axis, and the distance EP34 between the image side of the third spacer and the object side of the fourth spacer along the optical axis satisfy the following: (T34+CT4) / EP34<5.0.

[0058] This solution provides a five-element optical imaging lens group. Through the rational design and combination of multiple lenses, spacers, and lens barrels, it achieves optical performance comparable to lenses with a higher number of elements, with fewer tolerances, and a smaller structural size compared to lenses with a higher number of elements. The optical imaging lens group corrects aberrations and reduces lens sensitivity by controlling the ratio of the image-side radius of curvature R8 to the object-side radius of curvature R7 of the fourth lens to be greater than zero and satisfying |R7|>|R8|. Furthermore, it maintains the parameter relationship (T34+CT4) / EP34 between the air gap T34 between the third and fourth lenses on the optical axis, the center thickness CT4 of the fourth lens on the optical axis, and the distance EP34 between the image-side and object-side surfaces of the third and fourth spacers along the optical axis within a reasonable range. This improves the poor assembly stability caused by insufficient lens rigidity and unreasonable space between components, resulting in more stable image formation and facilitating field curvature adjustment and improved performance of the optical imaging lens group.

[0059] Preferably, the air gap T34 between the third and fourth lenses on the optical axis of the optical imaging lens group, the center thickness CT4 of the fourth lens on the optical axis, and the distance EP34 between the image side of the third spacer and the object side of the fourth spacer along the optical axis satisfy the following: 1.0 < (T34 + CT4) / EP34 < 3.0. More preferably, 1.33 ≤ (T34 + CT4) / EP34 ≤ 2.77.

[0060] The gap between the third and fourth lenses in the optical imaging lens group of this application can vary considerably, making this a sensitive area. This places high demands on the fabrication, shaping, and assembly of the third lens, third spacer, and fourth lens, significantly impacting assembly stability. By controlling (T34+CT4) / EP34 within a reasonable range, the assembly stability and consistency of the third lens, third spacer, fourth lens, and fourth spacer can be improved, thereby enhancing the overall assembly stability of the optical imaging lens group.

[0061] In this embodiment, the radius of curvature R2 of the image-side surface of the first lens, the radius of curvature R3 of the object-side surface of the second lens, the inner diameter d1m of the image-side surface of the first spacer, and the inner diameter d2m of the image-side surface of the second spacer satisfy the following condition: (R2+R3) / (d1m+d2m)<10.0. Controlling (R2+R3) / (d1m+d2m) within a reasonable range helps reduce the processing angle between the image-side surface of the first lens and the object-side surface of the second lens, which is beneficial for the forming and assembly of the first and second lenses, enhancing assembly stability. Simultaneously, it helps control the inner diameter of the image-side surface of the first and second spacers, blocking and improving stray light, and ensuring more sufficient light transmission to the rear lens, thus improving image quality. Preferably, 2.0<(R2+R3) / (d1m+d2m)<8.0. More preferably, 3.22≤(R2+R3) / (d1m+d2m)≤6.84.

[0062] In this embodiment, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens in the optical imaging lens group satisfy |f1| < |f2|. The effective focal lengths f1 and f2 of the first lens, the outer diameter D1m of the image-side surface of the first spacer, and the outer diameter D2m of the image-side surface of the second spacer satisfy 2.0 < |f1 / D1m| + |f2 / D2m| < 9.0. By controlling |f1| < |f2|, it is beneficial to rationally allocate the effective focal lengths of the first and second lenses, better control the deflection of light, and thus give the optical imaging lens group better optical performance. By controlling |f1 / D1m| + |f2 / D2m| within a reasonable range, it is beneficial to rationally allocate the effective focal lengths of the first and second lenses, thereby improving the overall imaging quality. It also helps to control the outer diameters of the image-side surfaces of the first and second spacers, rationally control the light ingress, and block and improve stray light. Preferably, 3.28 ≤ |f1 / D1m| + |f2 / D2m| ≤ 5.87.

[0063] In this embodiment, the absolute value of the radius of curvature of the image-side surface of the fifth lens in the optical imaging lens group is the smallest among the absolute values ​​of the radii of curvature of the object-side and image-side surfaces of all lenses in the optical imaging lens group, and the distance from the image-side surface of the fifth lens to the image-side end face of the lens barrel 10 is less than 1 mm. By controlling the radius of curvature of the image-side surface of the fifth lens, the sag and processing angle of the fifth lens can be reasonably controlled, which helps to reduce the difficulty of the molding process of the fifth lens and is more conducive to the assembly of the fifth lens. Setting the distance from the image-side surface of the fifth lens to the image-side end face of the lens barrel 10 to less than 1 mm avoids the image-side end face of the lens barrel 10 from blocking the light emitted from the fifth lens. In addition, it can also control the overall length of the optical imaging lens group, which is beneficial to the thinning of the optical imaging lens group.

[0064] In this embodiment, the contact area between the object-side surface of the fourth spacer and the image-side surface of the fourth lens is greater than 2.0 mm. 2 The outer diameter D4s of the object side of the fourth spacer, the inner diameter d4s of the object side of the fourth spacer, and the effective focal length f1 of the fourth lens satisfy the following condition: 0.1 < π * [(D4s / 2)] 2 -(d4s / 2) 2 ] / (f4) 2 <15.0. By controlling this condition, the contact area between the fourth lens and the fourth spacer can be ensured to be large enough, which not only stabilizes the forming of the fourth lens but also ensures the assembly stability of the fourth spacer. Preferably, 0.45≤π*[(D4s / 2)] 2 -(d4s / 2) 2 ] / (f4) 2 ≤10.82.

[0065] In this embodiment, the curvature radii R7 and R8 of the object-side surface of the fourth lens, and the curvature radii R9 and R10 of the object-side surface of the fifth lens in the optical imaging lens group satisfy the following relationship: R7 / R8 > R10 / R9. Controlling the curvature radii of the fourth and fifth lenses facilitates reasonable control of their sagitta, reducing the difficulty of the molding process. Controlling R7 / R8 > R10 / R9 helps control the influence of the surface curvature of the fourth and fifth lenses on the spacing between them, effectively avoiding interference between them. This improves the overall stray light quality of the optical imaging lens group and also reduces assembly difficulty, facilitating improved assembly stability.

[0066] In this embodiment, the radius of curvature R7 of the object side of the fourth lens, the radius of curvature R8 of the image side of the fourth lens, the outer diameter D4m of the image side of the fourth spacer, and the inner diameter d4m of the image side of the fourth spacer satisfy the following relationship: (D4m+d4m) / (R7+R8)<0. By controlling (D4m+d4m) / (R7+R8) within a reasonable range, the interception of stray light by the fourth spacer can be improved, the manufacturability of the fourth lens can be guaranteed, and the assembly difficulty of the fourth lens and the fourth spacer can be reduced. Preferably, -2.0<(D4m+d4m) / (R7+R8)<0. More preferably, -1.80≤(D4m+d4m) / (R7+R8)≤-0.08.

[0067] In this embodiment, the absolute value of the effective focal length of the fourth lens is less than the absolute value of the effective focal length of the second lens of the optical imaging lens group, and the absolute value of the effective focal length of the fourth lens is less than the absolute value of the effective focal length of the third lens. The following relationship is satisfied among the effective focal length f4 of the fourth lens, the outer diameter D4s of the object side surface of the fourth spacer, and the inner diameter d4s of the object side surface of the fourth spacer: f4 / (D4s - d4s) > 0.3. By controlling the absolute value of the effective focal length of the fourth lens to be less than the absolute values of the effective focal lengths of the second lens and the third lens, light can enter and converge better, making the imaging clearer. On the premise of ensuring clear imaging, controlling f4 / (D4s - d4s) within a reasonable range helps to improve the assembly stability of the fourth lens and the fourth spacer, solve the problem of low yield caused by the mating amount, and also helps to reasonably control the effective focal length of the fourth lens and improve the imaging quality of the optical imaging lens group. Preferably, 0.3 < f4 / (D4s - d4s) < 4.0. More preferably, 0.47 ≤ f4 / (D4s - d4s) ≤ 3.67.

[0068] In this embodiment, the absolute value of the effective focal length of the fifth lens of the optical imaging lens group is less than the absolute value of the effective focal length of the first lens of the optical imaging lens group, the absolute value of the effective focal length of the fifth lens is less than the absolute value of the effective focal length of the second lens of the optical imaging lens group, the absolute value of the effective focal length of the fifth lens is less than the absolute value of the effective focal length of the third lens. The following relationship is satisfied among the effective focal length f5 of the fifth lens, the distance EP34 between the image side surface of the third spacer and the object side surface of the fourth spacer along the optical axis of the optical imaging lens group, and the maximum thickness CP4 of the fourth spacer: f5 / (EP34 + CP4) < -1.5. By controlling the absolute value of the effective focal length of the fifth lens to be less than the absolute values of the effective focal lengths of the first lens to the third lens, it is beneficial to reasonably distribute the effective focal lengths of the first lens, the second lens, the third lens, and the fifth lens, so that the optical imaging lens group can have better optical performance. By controlling f5 / (EP34 + CP4) within a reasonable range, when EP34 + CP4 is smaller, the wall thickness of the barrel 10 at the fourth lens is larger, causing the inner diameter of the contact position between the barrel 10 and the object side surface of the first lens and the inner diameter of the position where the barrel 10 abuts against the lens and the spacer to increase synchronously, which is beneficial to increasing the light entrance amount. Furthermore, it is beneficial for the optical imaging lens group to have a larger entrance pupil diameter under a limited optical total length, so as to obtain more light entrance amount. It is beneficial to control the processing, forming, and assembly of the third spacer, the fourth lens, and the fourth spacer, avoid mutual interference, and ensure the assembly stability among the third spacer, the fourth lens, and the fourth spacer. Preferably, -4.0 < f5 / (EP34 + CP4) < -1.5. More preferably, -3.83 ≤ f5 / (EP34 + CP4) < -2.0.

[0069] In this embodiment, the outer wall of the lens barrel has a stepped surface 11 in the middle. The center position of the object side of the fourth lens is closer to the image side end face of the lens barrel 10 relative to the stepped surface 11 along the optical axis of the optical imaging lens group. This arrangement can reduce the molding difficulty of the lens barrel 10, making the molding more stable and reducing errors. It can also reasonably control the spacing between the lenses, ensuring that the center position of the object side of the fourth lens is closer to the image side relative to the stepped surface 11, avoiding excessive light deflection, and reducing the processing difficulty of the optical imaging lens group.

[0070] It should be noted that the center position of the object side of the fourth lens refers to the position of the object side of the fourth lens closest to the optical axis.

[0071] In this embodiment, the inner wall surface of the lens barrel 10 has a contact surface 12 that contacts the outer peripheral surface of the fourth lens. The distance from the contact surface 12 to the outer wall surface of the lens barrel 10 in a direction perpendicular to the optical axis is greater than 0.41 mm. By controlling the wall thickness of the lens barrel 10 to be greater than 0.41 mm, the stability of the lens barrel 10 molding is greatly improved, and the assembly is also more stable, reducing the deformation of the lens barrel 10. In addition, the data of the optical imaging lens group before and after the reliability test are more stable, greatly improving the imaging quality.

[0072] Example 2

[0073] like Figures 1 to 20 As shown, the optical imaging lens group includes a lens barrel, a first to a fifth lens housed within the lens barrel, and multiple spacers. The spacer located on the image side of the i-th lens and in contact with the image side of the i-th lens is the i-th spacer, where i is a value taken from 1, 2, 3, and 4. Among the multiple spacers, there is at least a first spacer and a second spacer. The ratio of the radius of curvature R8 of the image side of the fourth lens to the radius of curvature R7 of the object side of the fourth lens is greater than zero and satisfies |R7|>|R8|. The radius of curvature R2 of the image side of the first lens, the radius of curvature R3 of the object side of the second lens, the inner diameter d1m of the image side of the first spacer, and the inner diameter d2m of the image side of the second spacer satisfy the following: (R2+R3) / (d1m+d2m)<10.0.

[0074] By controlling R7 and R8 of the fourth lens, its rigidity, i.e., its structural strength, is enhanced, resulting in a fuller shape and more stable forming. Maintaining (R2+R3) / (d1m+d2m) within a reasonable range helps reduce the processing angle between the image-side surface of the first lens and the object-side surface of the second lens, facilitating the forming and assembly of the first and second lenses and enhancing assembly stability. The inclusion of the first and second spacers reduces the risk of movement of the first and second lenses and facilitates adjustment of the distance between them, preventing collisions and improving assembly stability. The spacers also provide greater space for improving stray light, thus contributing to overall stray light quality improvement in the optical imaging lens assembly and enhancing image quality. Containing the lenses and spacers within the lens barrel 10 prevents external collisions from affecting the internal stability of the optical imaging lens assembly. Controlling the inner diameter of the image-side surface of the first and second spacers helps to block and improve stray light, ensuring more light is transmitted to the rear lens and improving image quality.

[0075] Preferably, the radius of curvature R2 of the image-side surface of the first lens, the radius of curvature R3 of the object-side surface of the second lens, the inner diameter d1m of the image-side surface of the first spacer, and the inner diameter d2m of the image-side surface of the second spacer satisfy the following: 2.0 < (R2 + R3) / (d1m + d2m) < 8.0. More preferably, 3.22 ≤ (R2 + R3) / (d1m + d2m) ≤ 6.84.

[0076] In this embodiment, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens in the optical imaging lens group satisfy |f1| < |f2|. The effective focal lengths f1 and f2 of the first lens, the outer diameter D1m of the image-side surface of the first spacer, and the outer diameter D2m of the image-side surface of the second spacer satisfy 2.0 < |f1 / D1m| + |f2 / D2m| < 9.0. By controlling |f1| < |f2|, it is beneficial to rationally allocate the effective focal lengths of the first and second lenses, better control the deflection of light, and thus give the optical imaging lens group better optical performance. By controlling |f1 / D1m| + |f2 / D2m| within a reasonable range, it is beneficial to rationally allocate the effective focal lengths of the first and second lenses, thereby improving the overall imaging quality. It also helps to control the outer diameters of the image-side surfaces of the first and second spacers, rationally control the entry of light, and block and improve stray light. Preferably, 3.28 ≤ |f1 / D1m| + |f2 / D2m| ≤ 5.87.

[0077] In this embodiment, the absolute value of the radius of curvature of the image-side surface of the fifth lens in the optical imaging lens group is the smallest among the absolute values ​​of the radii of curvature of the object-side and image-side surfaces of all lenses in the optical imaging lens group, and the distance from the image-side surface of the fifth lens to the image-side end face of the lens barrel 10 is less than 1 mm. By controlling the radius of curvature of the image-side surface of the fifth lens, the sag and processing angle of the fifth lens can be reasonably controlled, which helps to reduce the difficulty of the molding process of the fifth lens and is more conducive to the assembly of the fifth lens. Setting the distance from the image-side surface of the fifth lens to the image-side end face of the lens barrel 10 to less than 1 mm avoids the image-side end face of the lens barrel 10 from blocking the light emitted from the fifth lens. In addition, it can also control the overall length of the optical imaging lens group, which is beneficial to the thinning of the optical imaging lens group.

[0078] In this embodiment, the contact area between the object-side surface of the fourth spacer and the image-side surface of the fourth lens is greater than 2.0 mm. 2 The outer diameter D4s of the object side of the fourth spacer, the inner diameter d4s of the object side of the fourth spacer, and the effective focal length f1 of the fourth lens satisfy the following condition: 0.1 < π * [(D4s / 2)] 2 -(d4s / 2) 2 ] / (f4) 2 <15.0. By controlling this condition, the contact area between the fourth lens and the fourth spacer can be ensured to be large enough, which not only stabilizes the forming of the fourth lens but also ensures the assembly stability of the fourth spacer. Preferably, 0.45≤π*[(D4s / 2)] 2 -(d4s / 2) 2 ] / (f4) 2 ≤10.82.

[0079] In this embodiment, the curvature radii R7 and R8 of the object-side surface of the fourth lens, and the curvature radii R9 and R10 of the object-side surface of the fifth lens in the optical imaging lens group satisfy the following relationship: R7 / R8 > R10 / R9. Controlling the curvature radii of the fourth and fifth lenses facilitates reasonable control of their sagitta, reducing the difficulty of the molding process. Controlling R7 / R8 > R10 / R9 helps control the influence of the surface curvature of the fourth and fifth lenses on the spacing between them, effectively avoiding interference between them. This improves the overall stray light quality of the optical imaging lens group and also reduces assembly difficulty, facilitating improved assembly stability.

[0080] In this embodiment, the following relationships are satisfied among the radius of curvature R7 of the object side surface of the fourth lens, the radius of curvature R8 of the image side surface of the fourth lens, the outer diameter D4m of the image side surface of the fourth spacer, and the inner diameter d4m of the image side surface of the fourth spacer: (D4m + d4m) / (R7 + R8) < 0. By controlling (D4m + d4m) / (R7 + R8) within a reasonable range, the interception and improvement of stray light by the fourth spacer can be controlled, the processability of the fourth lens can be ensured, and the assembly difficulty between the fourth lens and the fourth spacer can be reduced. Preferably, -2.0 < (D4m + d4m) / (R7 + R8) < 0. More preferably, -1.80 ≤ (D4m + d4m) / (R7 + R8) ≤ -0.08.

[0081] In this embodiment, the absolute value of the effective focal length of the fourth lens is less than the absolute value of the effective focal length of the second lens of the optical imaging lens group, and the absolute value of the effective focal length of the fourth lens is less than the absolute value of the effective focal length of the third lens. The following relationship is satisfied among the effective focal length f4 of the fourth lens, the outer diameter D4s of the object side surface of the fourth spacer, and the inner diameter d4s of the object side surface of the fourth spacer: f4 / (D4s - d4s) > 0.3. By controlling the absolute value of the effective focal length of the fourth lens to be less than the absolute values of the effective focal lengths of the second lens and the third lens, light can enter and converge better, making the imaging clearer. On the premise of ensuring clear imaging, controlling f4 / (D4s - d4s) within a reasonable range helps to improve the assembly stability of the fourth lens and the fourth spacer, improve the problem of low yield caused by the mating amount, and at the same time helps to reasonably control the effective focal length of the fourth lens and improve the imaging quality of the optical imaging lens group. Preferably, 0.3 < f4 / (D4s - d4s) < 4.0. More preferably, 0.47 ≤ f4 / (D4s - d4s) ≤ 3.67.

[0082] In this embodiment, the absolute value of the effective focal length of the fifth lens of the optical imaging lens group is less than the absolute value of the effective focal length of the first lens of the optical imaging lens group, the absolute value of the effective focal length of the fifth lens is less than the absolute value of the effective focal length of the second lens of the optical imaging lens group, the absolute value of the effective focal length of the fifth lens is less than the absolute value of the effective focal length of the third lens, and the following is satisfied among the absolute value of the effective focal length f5 of the fifth lens, the distance EP34 between the image side surface of the third spacer and the object side surface of the fourth spacer along the optical axis of the optical imaging lens group, and the maximum thickness CP4 of the fourth spacer: f5 / (EP34 + CP4) < -1.5. By controlling the absolute value of the effective focal length of the fifth lens to be less than the absolute values of the effective focal lengths of the first lens to the third lens, it is beneficial to reasonably distribute the effective focal lengths of the first lens, the second lens, the third lens, and the fifth lens, so that the optical imaging lens group can have better optical performance. By controlling f5 / (EP34 + CP4) within a reasonable range, when EP34 + CP4 is smaller, the wall thickness of the barrel 10 at the fourth lens will be larger, causing the inner diameter of the contact position between the barrel 10 and the object side surface of the first lens and the inner diameter of the position where the barrel 10 abuts against the lens and the spacer to increase synchronously, which is beneficial to increasing the light input amount. Furthermore, it is beneficial for the optical imaging lens group to have a larger entrance pupil diameter under a limited optical total length, so as to obtain more light input amount. It is beneficial to control the processing and assembly of the third spacer, the fourth lens, and the fourth spacer, avoid mutual interference, and ensure the assembly stability among the third spacer, the fourth lens, and the fourth spacer. Preferably, -4.0 < f5 / (EP34 + CP4) < -1.5. Further preferably, -3.83 ≤ f5 / (EP34 + CP4) ≤ -2.35.

[0083] In this embodiment, the middle part of the outer wall surface of the barrel has a step surface 11, and the central position of the object side surface of the fourth lens is closer to the image side end surface of the barrel 10 relative to the step surface 11 along the optical axis direction of the optical imaging lens group. Such a setting can reduce the forming process difficulty of the barrel 10, make the forming more stable, and reduce errors; it can also reasonably control the intervals between the lenses, ensure that the central position of the object side surface of the fourth lens is closer to the image side relative to the step surface 11, avoid excessive light deflection, and at the same time reduce the processing difficulty of the optical imaging lens group.

[0084] It should be noted that the central position of the object side surface of the fourth lens refers to the position of the object side surface of the fourth lens close to the optical axis.

[0085] In this embodiment, the inner wall surface of the lens barrel 10 has a contact surface 12 that contacts the outer peripheral surface of the fourth lens. The distance from the contact surface 12 to the outer wall surface of the lens barrel 10 in a direction perpendicular to the optical axis is greater than 0.41 mm. By controlling the wall thickness of the lens barrel 10 to be greater than 0.41 mm, the stability of the lens barrel 10 molding is greatly improved, and the assembly is also more stable, reducing the deformation of the lens barrel 10. In addition, the data of the optical imaging lens group before and after the reliability test are more stable, greatly improving the imaging quality.

[0086] Optionally, the aforementioned optical imaging lens assembly may also include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0087] The optical imaging lens group in this application can employ multiple lenses, such as the five lenses mentioned above. By rationally allocating the effective focal length, surface shape, center thickness of each lens, and on-axis distance between each lens, the aperture of the optical imaging lens group can be effectively increased, the sensitivity of the lens can be reduced, and the manufacturability of the lens can be improved. This makes the optical imaging lens group more conducive to production and processing and suitable for portable electronic devices such as smartphones.

[0088] In this application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. An aspherical lens is characterized by a continuously changing curvature from its center to its periphery. Unlike a spherical lens, which has a constant curvature from its center to its periphery, an aspherical lens has superior curvature radius characteristics, offering advantages in improving distortion and astigmatism. By using aspherical lenses, aberrations occurring during image formation can be eliminated as much as possible, thereby improving image quality.

[0089] However, those skilled in the art will understand that the number of lenses constituting the optical imaging lens group can be changed without departing from the technical solutions claimed in this application to obtain the various results and advantages described in this specification. For example, although five lenses are described as an example in the embodiments, the optical imaging lens group is not limited to including five lenses. If necessary, the optical imaging lens group may also include other numbers of lenses.

[0090] Figure 1 A schematic diagram of the structure of an optical imaging lens group of this application is shown. Figure 1 The diagram also labels parameters such as d1s, D1S, and D1m to provide a clear and intuitive understanding of their meaning. To better illustrate the optical imaging lens group structure and specific surface shapes, these parameters will not be shown in the accompanying diagrams when explaining specific examples.

[0091] Where Dis refers to the outer diameter of the object side of the i-th spacer, dis refers to the inner diameter of the object side of the i-th spacer, Dim refers to the outer diameter of the image side of the i-th spacer, and dim refers to the inner diameter of the image side of the i-th spacer, where i takes values ​​from 1, 2, 3, and 4. EPij refers to the distance along the optical axis between the image side of the i-th spacer and the object side of the j-th spacer, where j > i, and i takes values ​​from 1, 2, and 3, while j takes values ​​from 2, 3, and 4.

[0092] The following description, with reference to the accompanying drawings, further illustrates examples of specific surface shapes and parameters of optical imaging lens groups applicable to the above embodiments.

[0093] It should be noted that the following examples include a first state, a second state, and a third state. In the same example, the first, second, third, fourth, and fifth lenses of the optical imaging lens group have the same radii of curvature, center thickness, inter-lens spacing, and higher-order image coefficients in the first, second, and third states. However, the parameters of the lens barrel 10, the thickness of the spacers, the inner and outer diameters of the spacers, and the distance between the spacers differ, as do the shapes of some lenses. In other words, the main structure used for imaging is the same, but the auxiliary structures used for imaging are different.

[0094] It should be noted that any of the examples one through three below are applicable to all embodiments of this application.

[0095] Example 1

[0096] like Figures 2 to 8 As shown, an optical imaging lens group of Example 1 of this application is described. Figure 2 A schematic diagram of the optical imaging lens group in Example 1 in its first state is shown. Figure 3 A schematic diagram of the optical imaging lens group in Example 1 in the second state is shown. Figure 4 A schematic diagram of the optical imaging lens group in Example 1 in the third state is shown.

[0097] like Figures 2 to 4 As shown, the optical imaging lens group includes, in sequence from the object side to the image side: first lens E1, first spacer P1, second lens E2, second spacer P2, third lens E3, third spacer P3, fourth lens E4, fourth spacer P4, fourth auxiliary spacer P4b, and fifth lens E5.

[0098] exist Figures 2 to 4In this structure, the first lens E1 and the second lens E2 are fastened together to form a fastening structure. A first spacer P1 is located inside the fastening structure, while the first lens E1 abuts against the second lens E2 in the outer region of the first spacer P1. The second lens E2 and the third lens E3 are both in contact with the second spacer P2. The third lens E3 and the fourth lens E4 are both in contact with the third spacer P3. Two spacers are placed between the fourth lens E4 and the fifth lens E5 to achieve a single-step setting, which is beneficial for the stable support of each structure.

[0099] The object-side surface S1 of the first lens is convex, and the image-side surface S2 of the first lens is concave. The object-side surface S3 of the second lens is convex, and the image-side surface S4 of the second lens is concave. The object-side surface S5 of the third lens is concave, and the image-side surface S6 of the third lens is concave. The object-side surface S7 of the fourth lens is concave, and the image-side surface S8 of the fourth lens is convex. The object-side surface S9 of the fifth lens is convex, and the image-side surface S10 of the fifth lens is concave.

[0100] In this example, the effective focal length f of the optical imaging lens group is 3.10 mm.

[0101] Table 1 shows the basic structural parameters of the optical imaging lens group in Example 1, where the units for radius of curvature, thickness / distance, and effective focal length are all millimeters (mm).

[0102]

[0103] Table 1

[0104] In Example 1, the object-side surface and image-side surface of any one of the lenses, from the first lens E1 to the fifth lens E5, are aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0105]

[0106] Where x is the distance vector from the vertex of the aspherical surface at a height h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R, that is, the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above; k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 that can be used for the aspherical mirrors S1-S10 in Example 1.

[0107]

[0108]

[0109] Table 2

[0110] Figure 5 The on-axis chromatic aberration curve of an optical imaging lens group in Example 1 is shown, which indicates the deflection of the focal point of light of different wavelengths after passing through the optical imaging lens group. Figure 6 The astigmatism curves of the optical imaging lens group in Example 1 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 7 The distortion curves of the optical imaging lens group in Example 1 are shown, representing the distortion magnitude values ​​corresponding to different field of view angles. Figure 8 The magnification chromatic aberration curve of the optical imaging lens group in Example 1 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical imaging lens group.

[0111] according to Figures 5 to 8 As can be seen, the optical imaging lens group given in Example 1 can achieve good imaging quality.

[0112] Example 2

[0113] like Figures 9 to 14 As shown, an optical imaging lens group of Example 2 of this application is described. Figure 9 A schematic diagram of the optical imaging lens group in Example 2 in its first state is shown. Figure 10 A schematic diagram of the optical imaging lens assembly of Example 2 in its second state is shown. For the sake of brevity, descriptions similar to those in Example 1 are omitted.

[0114] like Figure 9 and Figure 10 As shown, the optical imaging lens group includes, in sequence from the object side to the image side: first lens E1, first spacer P1, second lens E2, second spacer P2, third lens E3, third spacer P3, fourth lens E4, fourth spacer P4, and fifth lens E5.

[0115] exist Figure 9 and Figure 10 In this structure, the first lens E1 and the second lens E2 are fastened together to form a fastening structure. A first spacer P1 is disposed on the inner side of the fastening structure, and the first lens E1 abuts against the second lens E2 in the outer region of the first spacer P1. The second lens E2 and the third lens E3 are both in contact with the second spacer P2. The third lens E3 and the fourth lens E4 are both in contact with the third spacer P3. The fourth lens E4 and the fifth lens E5 are both in contact with the fourth spacer P4.

[0116] The object-side surface S1 of the first lens is convex, and the image-side surface S2 of the first lens is concave. The object-side surface S3 of the second lens is convex, and the image-side surface S4 of the second lens is concave. The object-side surface S5 of the third lens is concave, and the image-side surface S6 of the third lens is convex. The object-side surface S7 of the fourth lens is concave, and the image-side surface S8 of the fourth lens is convex. The object-side surface S9 of the fifth lens is convex, and the image-side surface S10 of the fifth lens is concave.

[0117] In this example, the effective focal length f of the optical imaging lens group is 4.20 mm.

[0118] Table 3 shows the basic structural parameters of the optical imaging lens group in Example 2, where the units for radius of curvature, thickness / distance, and effective focal length are all millimeters (mm).

[0119]

[0120]

[0121] Table 3

[0122] Table 4 gives the higher-order coefficients of S1-S10 that can be used for each aspherical mirror in Example 2, wherein each aspherical surface shape can be defined by Formula 1 given in Example 1 above.

[0123] Face number A4 A6 A8 A10 A12 A14 A16 S1 -3.8048E-03 -3.4949E-03 -3.0696E-03 -8.2192E-04 -4.3604E-04 6.4906E-06 -5.7397E-05 S2 -5.1363E-02 1.0938E-03 -1.3885E-03 -3.2788E-05 1.6511E-04 -4.4475E-05 3.7071E-05 S3 -1.1474E-02 1.4711E-02 8.8797E-06 7.3446E-04 2.1802E-04 -1.5239E-06 3.3162E-05 S4 2.2946E-02 1.0951E-02 1.1509E-03 8.5727E-04 2.4687E-04 1.4168E-04 3.3996E-05 S5 -1.1457E-01 -5.6540E-03 1.6568E-03 1.0767E-03 6.2193E-04 1.4595E-04 8.2721E-05 S6 -2.5828E-01 -1.1957E-02 3.7900E-03 2.4502E-03 1.3887E-03 8.2290E-04 3.7575E-04 S7 -2.7621E-01 1.6728E-02 4.7938E-03 -8.9303E-03 -1.5858E-03 1.3709E-03 4.9767E-04 S8 4.7568E-01 8.7382E-02 -4.7833E-02 -1.3858E-02 1.7111E-02 -6.9462E-04 -5.0307E-03 S9 -1.6717E+00 7.5896E-01 -2.8634E-01 7.9549E-02 -2.0150E-02 1.0600E-02 -1.0997E-02 S10 -4.1132E+00 6.7464E-01 -2.8250E-01 1.0750E-01 -4.6155E-02 2.9061E-02 -1.0838E-02 Face number A18 A20 A22 A24 A26 A28 A30 S1 3.4657E-05 -2.3833E-05 2.2037E-05 -1.3182E-05 8.4476E-06 -7.6365E-06 6.2075E-06 S2 -2.7868E-05 1.7150E-05 -7.6147E-06 1.3386E-05 -4.8460E-06 7.2171E-06 -1.2781E-06 S3 -1.1294E-05 1.4009E-05 -9.2762E-08 1.1336E-05 -1.7823E-06 7.2999E-07 0.0000E+00 S4 3.8857E-05 2.7506E-06 1.4001E-05 -3.3929E-06 5.9272E-06 -8.0504E-07 3.6539E-06 S5 -2.0600E-05 8.9043E-07 -1.1437E-05 4.2773E-06 -3.9394E-06 8.4496E-06 -8.6585E-06 S6 1.5238E-04 4.1983E-05 9.8917E-06 -6.0262E-07 3.4771E-06 2.0343E-06 1.0926E-06 S7 -1.8546E-04 3.1178E-06 7.3970E-05 5.4471E-05 -9.9720E-06 -1.8575E-05 -2.2902E-05 S8 1.3124E-03 1.3843E-03 -7.5168E-04 -2.7493E-04 2.9485E-04 5.5499E-05 -1.1038E-04 S9 6.7080E-03 -2.5255E-03 1.1072E-03 -5.7244E-04 4.3019E-04 8.4096E-05 -1.1531E-04 S10 8.6429E-03 -3.4651E-03 1.7861E-03 -1.2732E-03 3.1800E-04 -3.7163E-04 1.1798E-04

[0124] Table 4

[0125] Figure 11 The on-axis chromatic aberration curve of the optical imaging lens group in Example 2 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens group. Figure 12 The astigmatism curves of the optical imaging lens group in Example 2 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 13 The distortion curves of the optical imaging lens group in Example 2 are shown, representing the distortion magnitude values ​​corresponding to different field of view angles. Figure 14 The magnification chromatic aberration curve of the optical imaging lens group in Example 2 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical imaging lens group.

[0126] according to Figures 11 to 14 As can be seen, the optical imaging lens group given in Example 2 can achieve good imaging quality.

[0127] Example 3

[0128] like Figures 15 to 20 As shown, an optical imaging lens group of Example 3 of this application is described. Figure 15 A schematic diagram of the optical imaging lens group in Example 3 in its first state is shown. Figure 16A schematic diagram of the optical imaging lens group of Example 3 in the second state is shown.

[0129] like Figure 15 and Figure 16 As shown, the optical imaging lens group includes, in sequence from the object side to the image side: first lens E1, first spacer P1, second lens E2, second spacer P2, third lens E3, third spacer P3, fourth lens E4, fourth spacer P4, fourth auxiliary spacer P4b, and fifth lens E5.

[0130] exist Figure 15 and Figure 16 In this structure, the first lens E1 and the second lens E2 are fastened together to form a fastening structure. A first spacer P1 is located inside the fastening structure, while the first lens E1 abuts against the second lens E2 in the outer region of the first spacer P1. The second lens E2 and the third lens E3 are both in contact with the second spacer P2. The third lens E3 and the fourth lens E4 are both in contact with the third spacer P3. There are two spacers between the fourth lens E4 and the fifth lens E5 to achieve a single-step setting, which is beneficial for the stable support of each structure.

[0131] The object-side surface S1 of the first lens is convex, and the image-side surface S2 of the first lens is concave. The object-side surface S3 of the second lens is convex, and the image-side surface S4 of the second lens is concave. The object-side surface S5 of the third lens is concave, and the image-side surface S6 of the third lens is convex. The object-side surface S7 of the fourth lens is concave, and the image-side surface S8 of the fourth lens is convex. The object-side surface S9 of the fifth lens is convex, and the image-side surface S10 of the fifth lens is concave.

[0132] In this example, the effective focal length f of the optical imaging lens group is 3.93 mm.

[0133] Table 5 shows the basic structural parameters of the optical imaging lens group in Example 3, where the units for radius of curvature, thickness / distance, and effective focal length are all millimeters (mm).

[0134]

[0135]

[0136] Table 5

[0137] Table 6 gives the higher-order coefficients of S1-S10 that can be used for each aspherical mirror in Example 3, wherein each aspherical surface shape can be defined by Formula 1 given in Example 1 above.

[0138] Face number A4 A6 A8 A10 A12 A14 A16 S1 2.8995E-03 -2.2576E-03 -1.7049E-03 -5.7958E-04 -2.0586E-04 -3.7192E-05 -1.2550E-05 S2 -3.9238E-02 3.1901E-03 -2.6162E-03 3.0132E-04 -1.1549E-04 -1.4731E-05 -1.7064E-05 S3 -2.5753E-02 1.4732E-02 -1.4075E-03 9.5608E-04 -5.1689E-05 9.2222E-06 -1.1966E-05 S4 3.2131E-02 7.6657E-03 4.0984E-04 5.5322E-04 1.0339E-04 4.3139E-05 1.8568E-05 S5 -1.1029E-01 -5.3915E-03 4.2847E-04 7.9334E-04 3.7633E-04 1.5993E-04 4.4122E-05 S6 -2.5286E-01 -1.1166E-02 4.6068E-03 1.2474E-03 4.8182E-04 2.1771E-04 1.5188E-04 S7 -3.1237E-01 1.5812E-02 2.6670E-03 -1.0469E-02 -3.1380E-03 4.0834E-04 -3.1831E-04 S8 2.6313E-01 8.4556E-02 -3.2261E-02 -1.4550E-02 8.3794E-03 2.4357E-03 -2.3596E-03 S9 -1.2815E+00 5.3036E-01 -1.9743E-01 5.9589E-02 -1.9687E-02 5.2985E-03 -2.9842E-03 S10 -3.8278E+00 7.2215E-01 -2.2846E-01 1.0890E-01 -3.8344E-02 1.8217E-02 -1.1187E-02 Face number A18 A20 A22 A24 A26 A28 A30 S1 3.2476E-06 -1.1682E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 -6.8479E-06 -1.6815E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 -1.2955E-05 -5.0335E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 3.0960E-06 -6.7994E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 1.3646E-05 -2.1328E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 1.4852E-05 1.6981E-05 -5.5868E-06 7.5814E-06 -9.8610E-06 0.0000E+00 0.0000E+00 S7 -5.5934E-04 -1.2898E-04 3.8600E-05 -3.1767E-05 -5.5700E-05 -2.9583E-05 0.0000E+00 S8 4.4537E-06 1.1206E-03 1.0656E-04 -1.6641E-04 1.2264E-04 1.4416E-04 0.0000E+00 S9 1.7380E-03 -8.9126E-04 1.8734E-04 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S10 3.1314E-03 -3.1521E-03 8.4621E-04 -6.0822E-04 3.1142E-04 -1.3423E-04 1.0499E-04

[0139] Table 6

[0140] Figure 17The on-axis chromatic aberration curve of the optical imaging lens group in Example 3 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens group. Figure 18 The astigmatism curves of the optical imaging lens group in Example 3 are shown, representing the meridional image plane curvature and the sagittal image plane curvature. Figure 19 The distortion curves of the optical imaging lens group in Example 3 are shown, representing the distortion magnitude values ​​corresponding to different field of view angles. Figure 20 The magnification chromatic aberration curve of the optical imaging lens group in Example 3 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical imaging lens group.

[0141] according to Figures 17 to 20 As can be seen, the optical imaging lens group given in Example 3 can achieve good imaging quality.

[0142] In summary, Examples 1 to 3 satisfy the relationships shown in Table 7.

[0143]

[0144]

[0145] Table 7

[0146] Table 8 provides some parameters of the optical imaging lens groups for Examples 1 to 3.

[0147] Examples / Parameters d1m D1m d2m D2m d4s d4m D4s D4m EP34 CP4 1-1 1.5160 2.2549 1.8338 3.7817 3.0732 3.0732 6.1688 6.1688 0.3975 0.0180 1-2 1.5160 2.2549 1.8338 3.7817 3.1090 3.0732 6.1688 6.1688 0.3975 0.0180 1-3 1.5560 2.3106 1.8740 3.8313 3.1492 3.1132 6.2171 6.2171 0.4443 0.0180 2-1 2.1113 2.6742 1.7720 3.8116 3.8933 4.9415 5.0693 6.0372 0.7281 0.3500 2-2 2.1113 2.7142 1.7720 3.8515 3.9533 4.7217 5.1261 5.9020 0.6931 0.3500 3-1 1.9992 2.6742 1.7610 3.8116 3.5150 3.5150 6.1688 6.1688 0.7461 0.0180 3-2 1.9992 2.6742 1.7610 3.8116 3.5510 3.5150 6.1688 6.1688 0.7461 0.0180

[0148] Table 8

[0149] It should be noted that in Tables 7 and 8, 1-1 represents the first state of the optical imaging lens group in Example 1, 1-2 represents the second state of the optical imaging lens group in Example 1, and 1-3 represents the third state of the optical imaging lens group in Example 1. Similarly, 2-1 represents the first state of the optical imaging lens group in Example 2, 2-2 represents the second state of the optical imaging lens group in Example 2, 3-1 represents the first state of the optical imaging lens group in Example 3, and 3-2 represents the second state of the optical imaging lens group in Example 3.

[0150] Table 9 shows the effective focal lengths of the first to fifth lenses of the optical imaging lens groups in Examples 1 to 3.

[0151] Effective focal length / example 1 2 3 f1(mm) 5.32 3.66 3.38 f2 (mm) 13.30 -9.26 -7.70 f3 (mm) -5.51 14.47 33.82 f4 (mm) 1.44 4.30 3.80 f5 (mm) -1.59 -2.54 -2.72 f(mm) 3.10 4.20 3.93

[0152] Table 9

[0153] 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 optical imaging lens group described above.

[0154] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0155] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0156] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0157] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An optical imaging lens assembly, characterized in that, The optical imaging lens group comprises five lenses with optical power, including a lens barrel, a first to a fifth lens housed within the lens barrel, and multiple spacers. Among them, the spacer located on the image side of the i-th lens and in contact with the image side of the i-th lens is the i-th spacer, where i is taken from 1, 2, 3, 4, and there is at least a third spacer and a fourth spacer among the multiple spacers; The first lens has positive optical power, the object side of the first lens is convex, and the image side of the first lens is concave. The second and third lenses have opposite optical powers. The object side of the second lens is convex, the image side of the second lens is concave, and the object side of the third lens is concave. The fourth lens has positive optical power, the object side of the fourth lens is concave, and the image side of the fourth lens is convex. The fifth lens has negative optical power, the object side of the fifth lens is convex, and the image side of the fifth lens is concave. The ratio of the radius of curvature R8 of the image side of the fourth lens to the radius of curvature R7 of the object side of the fourth lens is greater than zero and satisfies |R7|>|R8|. The air gap T34 between the third lens and the fourth lens on the optical axis of the optical imaging lens group, the center thickness CT4 of the fourth lens on the optical axis, and the distance EP34 between the image side surface of the third spacer and the object side surface of the fourth spacer along the optical axis satisfy the following: 1.33≤(T34+CT4) / EP34≤2.77; The contact area between the object-side surface of the fourth spacer and the image-side surface of the fourth lens is greater than 2.0 mm. 2 The outer diameter D4s of the object side of the fourth spacer, the inner diameter d4s of the object side of the fourth spacer, and the effective focal length f4 of the fourth lens satisfy the following condition: 0.45 ≤ π * [(D4s / 2)] 2 -(d4s / 2) 2 ] / (f4) 2 ≤10.82; The absolute value of the effective focal length of the fifth lens is less than the absolute value of the effective focal length of the first lens, the absolute value of the effective focal length of the fifth lens is less than the absolute value of the effective focal length of the second lens, and the absolute value of the effective focal length of the fifth lens is less than the absolute value of the effective focal length of the third lens. The effective focal length f5 of the fifth lens, the distance EP34 between the image side surface of the third spacer and the object side surface of the fourth spacer along the optical axis, and the maximum thickness CP4 of the fourth spacer satisfy the following condition: -3.83≤f5 / (EP34+CP4)≤-2.35; The absolute value of the effective focal length of the fourth lens is less than the absolute value of the effective focal length of the second lens, and the absolute value of the effective focal length of the fourth lens is less than the absolute value of the effective focal length of the third lens. The effective focal length f4 of the fourth lens, the outer diameter D4s of the object side of the fourth spacer, and the inner diameter d4s of the object side of the fourth spacer satisfy the following condition: 0.47≤f4 / (D4s-d4s)≤3.

67.

2. The optical imaging lens assembly according to claim 1, characterized in that, The radius of curvature R2 of the image side of the first lens, the radius of curvature R3 of the object side of the second lens, the inner diameter d1m of the image side of the first spacer, and the inner diameter d2m of the image side of the second spacer satisfy the following: 3.22≤(R2+R3) / (d1m+d2m)≤6.

84.

3. The optical imaging lens assembly according to claim 1, characterized in that, The effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy the condition: |f1|<|f2|. The effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the outer diameter D1m of the image side of the first spacer, and the outer diameter D2m of the image side of the second spacer satisfy the condition: 3.28≤|f1 / D1m|+|f2 / D2m|≤5.

87.

4. The optical imaging lens assembly according to claim 1, characterized in that, The absolute value of the radius of curvature of the image side surface of the fifth lens is the smallest among the absolute values ​​of the radius of curvature of the object side surface and the image side surface of each lens in the optical imaging lens group, and the distance from the image side surface of the fifth lens to the image side end face of the lens barrel is less than 1 mm.

5. The optical imaging lens assembly according to claim 1, characterized in that, The curvature radius R7 of the object side of the fourth lens, the curvature radius R8 of the image side of the fourth lens, the curvature radius R9 of the object side of the fifth lens, and the curvature radius R10 of the image side of the fifth lens satisfy the following condition: R7 / R8>R10 / R9.

6. The optical imaging lens assembly according to any one of claims 1 to 5, characterized in that, The radius of curvature R7 of the object side of the fourth lens, the radius of curvature R8 of the image side of the fourth lens, the outer diameter D4m of the image side of the fourth spacer, and the inner diameter d4m of the image side of the fourth spacer satisfy the following condition: -1.80≤(D4m+d4m) / (R7+R8)≤-0.

08.

7. The optical imaging lens assembly according to any one of claims 1 to 5, characterized in that, The outer wall of the lens barrel has a stepped surface in the middle, and the center position of the object side of the fourth lens is close to the image side end face of the lens barrel relative to the stepped surface along the optical axis.

8. The optical imaging lens assembly according to any one of claims 1 to 5, characterized in that, The inner wall of the lens barrel has a contact surface that contacts the outer peripheral surface of the fourth lens, and the distance from the contact surface to the outer wall of the lens barrel in a direction perpendicular to the optical axis is greater than 0.41 mm.

9. An optical imaging lens assembly, characterized in that, The optical imaging lens group comprises five lenses with optical power, including a lens barrel, a first to a fifth lens housed within the lens barrel, and multiple spacers. Among them, the spacer located on the image side of the i-th lens and in contact with the image side of the i-th lens is the i-th spacer, where i is taken from 1, 2, 3, 4, and there are at least a first spacer, a second spacer, a third spacer, and a fourth spacer among the multiple spacers. The first lens has positive optical power, the object side of the first lens is convex, and the image side of the first lens is concave. The second and third lenses have opposite optical powers. The object side of the second lens is convex, the image side of the second lens is concave, and the object side of the third lens is concave. The fourth lens has positive optical power, the object side of the fourth lens is concave, and the image side of the fourth lens is convex. The fifth lens has negative optical power, the object side of the fifth lens is convex, and the image side of the fifth lens is concave. The ratio of the radius of curvature R8 of the image-side surface of the fourth lens to the radius of curvature R7 of the object-side surface of the fourth lens is greater than zero and satisfies |R7|>|R8|. The radius of curvature R2 of the image side of the first lens, the radius of curvature R3 of the object side of the second lens, the inner diameter d1m of the image side of the first spacer, and the inner diameter d2m of the image side of the second spacer satisfy the following: 3.22≤(R2+R3) / (d1m+d2m)≤6.84; The contact area between the object-side surface of the fourth spacer and the image-side surface of the fourth lens is greater than 2.0 mm. 2 The outer diameter D4s of the object side of the fourth spacer, the inner diameter d4s of the object side of the fourth spacer, and the effective focal length f4 of the fourth lens satisfy the following condition: 0.45 ≤ π * [(D4s / 2)] 2 -(d4s / 2) 2 ] / (f4) 2 ≤10.82; The absolute value of the effective focal length of the fifth lens is less than the absolute value of the effective focal length of the first lens, the absolute value of the effective focal length of the fifth lens is less than the absolute value of the effective focal length of the second lens, and the absolute value of the effective focal length of the fifth lens is less than the absolute value of the effective focal length of the third lens. The effective focal length f5 of the fifth lens, the distance EP34 between the image side surface of the third spacer and the object side surface of the fourth spacer along the optical axis of the optical imaging lens group, and the maximum thickness CP4 of the fourth spacer satisfy the following: -3.83≤f5 / (EP34+CP4)≤-2.35; The absolute value of the effective focal length of the fourth lens is less than the absolute value of the effective focal length of the second lens, and the absolute value of the effective focal length of the fourth lens is less than the absolute value of the effective focal length of the third lens. The effective focal length f4 of the fourth lens, the outer diameter D4s of the object side of the fourth spacer, and the inner diameter d4s of the object side of the fourth spacer satisfy the following condition: 0.47≤f4 / (D4s-d4s)≤3.

67.

10. The optical imaging lens assembly according to claim 9, characterized in that, The effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy the condition: |f1|<|f2|. The effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the outer diameter D1m of the image side of the first spacer, and the outer diameter D2m of the image side of the second spacer satisfy the condition: 3.28≤|f1 / D1m|+|f2 / D2m|≤5.

87.

11. The optical imaging lens assembly according to claim 9, characterized in that, The absolute value of the radius of curvature of the image side surface of the fifth lens is the smallest among the absolute values ​​of the radius of curvature of the object side surface and the image side surface of each lens in the optical imaging lens group, and the distance from the image side surface of the fifth lens to the image side end face of the lens barrel is less than 1 mm.

12. The optical imaging lens assembly according to claim 9, characterized in that, The curvature radius R7 of the object side of the fourth lens, the curvature radius R8 of the image side of the fourth lens, the curvature radius R9 of the object side of the fifth lens, and the curvature radius R10 of the image side of the fifth lens satisfy the following condition: R7 / R8>R10 / R9.

13. The optical imaging lens assembly according to any one of claims 9 to 12, characterized in that, The radius of curvature R7 of the object side of the fourth lens, the radius of curvature R8 of the image side of the fourth lens, the outer diameter D4m of the image side of the fourth spacer, and the inner diameter d4m of the image side of the fourth spacer satisfy the following condition: -1.80≤(D4m+d4m) / (R7+R8)≤-0.

08.

14. The optical imaging lens assembly according to any one of claims 9 to 12, characterized in that, The outer wall of the lens barrel has a stepped surface in the middle, and the center position of the object side of the fourth lens is close to the image side end face of the lens barrel relative to the stepped surface along the optical axis.

15. The optical imaging lens assembly according to any one of claims 9 to 12, characterized in that, The inner wall of the lens barrel has a contact surface that contacts the outer peripheral surface of the fourth lens, and the distance from the contact surface to the outer wall of the lens barrel in a direction perpendicular to the optical axis is greater than 0.41 mm.

Images