Optical imaging lens

Abstract

The utility model provides an optical imaging lens, which comprises a lens barrel and a plurality of lenses, the object side end of the lens barrel is provided with a stop ring extending towards the optical axis of the optical imaging lens, one side of the stop ring facing an accommodating space is provided with at least one buckling structure, and the buckling structure comprises a first buckling surface, a buckling inclined surface and a second buckling surface which are connected in sequence; the plurality of lenses are provided with at least one front-end lens which abuts against the stop ring, and the object side surface of the front-end lens is buckled with the buckling structure; wherein the maximum wall thickness T of the lens barrel corresponding to the gear surface and the distance B between the first buckling surface and the second buckling surface in the optical axis direction meet the condition that T / B is greater than 1 and less than 20; the shortest diameter DK of the lens barrel in buckling contact with the front-end lens and the outer diameter DW of the front-end lens meet the condition that DK / DW is larger than 0.2 and smaller than 1.0. The problem that in the prior art, the front end structure of an optical imaging lens is poor in stability is solved.

Description

Technical Field

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

[0002] In existing optical imaging lens designs, the engagement mechanism between the lens barrel and the lens is one of the key factors ensuring the overall stability of the lens performance. However, traditional designs reveal some shortcomings when facing complex assembly environments and usage conditions, especially when the optical imaging lens is subjected to external forces, where the stability of the front lens becomes particularly prominent. In traditional optical imaging lenses, the design of the lens barrel may not fully consider structural stability under stress, making the lens barrel prone to deformation under external forces, especially at the object-side end. The front lens, which engages with the object-side end of the lens barrel, typically undertakes the important tasks of receiving light and initial focusing, and its stability directly affects the performance of the entire optical system. However, in existing technologies, after the lens barrel deforms, the front lens is prone to misalignment under stress. This not only affects the positioning accuracy of the front lens but may also cause optical path shifts, thus affecting image quality.

[0003] In other words, existing optical imaging lenses suffer from poor front-end structural stability. Utility Model Content

[0004] The main objective of this invention is to provide an optical imaging lens to solve the problem of poor stability of the front-end structure of existing optical imaging lenses.

[0005] To achieve the above objectives, this utility model provides an optical imaging lens, comprising: a lens barrel having a receiving space, a stop ring extending toward the optical axis of the optical imaging lens at the object-side end of the lens barrel, the stop ring having at least one fastening structure on the side facing the receiving space, the fastening structure including a first fastening surface, a fastening inclined surface, and a second fastening surface connected in sequence, the second fastening surface being disposed closer to the optical axis than the first fastening surface; a plurality of lenses, the plurality of lenses being housed within the receiving space, at least one of the plurality of lenses having a front lens that abuts against the stop ring, the object-side surface of the front lens being fastened to the fastening structure, the inner wall surface of the lens barrel also having at least one stop surface, the outer ring surface of the front lens being able to abut against the stop surface; wherein, the maximum wall thickness T of the lens barrel corresponding to the stop surface and the distance B between the first fastening surface and the second fastening surface along the optical axis satisfy: 1 ​​< T / B < 20; the shortest diameter DK of the lens barrel in fastening contact with the front lens and the outer diameter DW of the front lens satisfy: 0.2 < DK / DW < 1.0.

[0006] Furthermore, the angle A between the extension direction of the snapping inclined surface and the direction perpendicular to the optical axis satisfies: 40°≤A≤85°, and the distance B between the first snapping surface and the second snapping surface along the optical axis satisfies: 0.06mm≤B≤0.25mm.

[0007] Furthermore, at most one of the engagement bevel and the stop surface is spaced apart from the front lens by a distance C, wherein the distance C satisfies: 0mm < C ≤ 0.02mm.

[0008] Furthermore, the front lens has a supporting section, the object side of which supports the lens barrel, and the image side of which supports one of the multiple lenses. The thickness Ta of the supporting section along the optical axis and the minimum thickness Tb of the front lens's structural part along the optical axis satisfy the following condition: 0 < Ta / Tb ≤ 2.

[0009] Furthermore, the outer ring surface of the front lens is set at an angle relative to the optical axis, and the angle Ra between the outer ring surface of the front lens and the direction perpendicular to the optical axis, and the angle A between the fastening inclined surface and the optical axis satisfy: 0.35≤Ra / A≤2.25.

[0010] Furthermore, from the object side to the image side of the optical imaging lens, the outer ring of the front lens extends in a direction away from the optical axis.

[0011] Furthermore, the first fastening surface abuts against the front lens, and the second fastening surface is spaced apart from the front lens. The thickness Tc of the lens barrel along the optical axis corresponding to the first fastening surface and the thickness Td of the lens barrel along the optical axis corresponding to the second fastening surface satisfy the following: 0.1mm≤Min(Tc,Td)≤1mm.

[0012] Furthermore, the first fastening surface abuts against the front lens, and the abutment length W between the first fastening surface and the front lens along the direction perpendicular to the optical axis, and the distance B between the first fastening surface and the second fastening surface along the optical axis satisfy the following condition: 0.1≤W / B≤5.

[0013] Furthermore, the optical imaging lens includes two front-end lenses and two fastening structures. The two fastening structures are arranged one-to-one with the two front-end lenses. The two front-end lenses are the first lens and the second lens, which are sequentially supported along the object side to the image side of the optical imaging lens. The fastening structure corresponding to the second lens is arranged further away from the optical axis than the fastening structure corresponding to the first lens.

[0014] Furthermore, from the object side to the image side of the optical imaging lens, the snapping slopes of both snapping structures extend toward or away from the optical axis.

[0015] According to the technical solution of this utility model, the optical imaging lens includes a lens barrel and multiple lenses. The lens barrel has a housing space. The object-side end of the lens barrel has a stop ring extending towards the optical axis of the optical imaging lens. The side of the stop ring facing the housing space has at least one fastening structure. The fastening structure includes a first fastening surface, a fastening inclined surface, and a second fastening surface connected in sequence. The second fastening surface is positioned closer to the optical axis than the first fastening surface. Multiple lenses are housed in the housing space. Among the multiple lenses, at least one front lens abuts against the stop ring. The object-side surface of the front lens is fastened to the fastening structure. The inner wall surface of the lens barrel also has at least one stop surface. The outer ring surface of the front lens can abut against the stop surface. The maximum wall thickness T of the lens barrel corresponding to the stop surface and the distance B between the first and second fastening surfaces along the optical axis satisfy: 1 ​​< T / B < 20. The shortest diameter DK of the lens barrel in fastening contact with the front lens and the outer diameter DW of the front lens satisfy: 0.2 < DK / DW < 1.0.

[0016] In the optical imaging lens of this application, the lens barrel houses multiple lenses. A stop ring extends from the object-side end of the lens barrel towards the optical axis of the optical imaging lens. To improve the assembly stability of the optical imaging lens, a fastening structure is provided on the side of the stop ring facing the housing space to fasten the lens barrel and the mating front lens together. In the direction close to the optical axis, the fastening structure sequentially connects a first fastening surface, a fastening bevel, and a second fastening surface. When the object-side surface of the front lens is fastened to the fastening structure, the stop of the annular fastening bevel effectively prevents the front lens from loosening under external environmental impact. However, due to differences in fastening depth and fastening position, the machinability of the lens barrel and the front lens and the stability of the fastening are severely affected. By adjusting the relationship between the lens barrel wall thickness and the fastening depth within a reasonable T / B range, sufficient contact between the front lens and the lens barrel is ensured to provide support. Simultaneously, the sufficient wall thickness of the lens barrel mitigates the impact on the front lens after deformation under stress, thus meeting the stability requirements of the optical imaging lens and reducing performance degradation. This also considers the manufacturability of both the lens barrel and the front lens. By controlling the DK / DW ratio within a reasonable range, the fastening position between the front lens and the fastening structure can be controlled, thereby adjusting the position where deformation of the lens barrel affects the front lens, indirectly reducing the deformation of the front lens. This also ensures uniform radial support for the front lens, reducing the risk of misalignment during assembly and improving the stability and anti-interference capability of the optical imaging lens. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0018] Figure 1A schematic diagram showing partial parameters of an optical imaging lens according to an optional embodiment of the present invention is shown;

[0019] Figure 2 A schematic diagram of the structure of the optical imaging lens according to Embodiment 1 of this utility model is shown;

[0020] Figure 3 It shows Figure 2 A partial structural diagram of the optical imaging lens in the image;

[0021] Figure 4 A partial structural schematic diagram of the optical imaging lens of Embodiment 2 of this utility model is shown;

[0022] Figure 5 A schematic diagram showing a portion of the parameters of the optical imaging lens of Embodiment 2 of this utility model is shown;

[0023] Figure 6 A schematic diagram showing another part of the parameters of the optical imaging lens of Embodiment 2 of this utility model is shown;

[0024] Figure 7 This diagram shows another set of parameters of the optical imaging lens according to Embodiment 2 of the present invention;

[0025] Figure 8 A schematic diagram of the structure of the optical imaging lens of Embodiment 3 of this utility model is shown;

[0026] Figure 9 It shows Figure 8 A partial structural diagram of the optical imaging lens in the image;

[0027] Figure 10 A schematic diagram showing some parameters of the optical imaging lens of Embodiment 3 of this utility model is shown;

[0028] Figure 11 A partial structural schematic diagram of the optical imaging lens of Embodiment 4 of this utility model is shown;

[0029] Figure 12 A schematic diagram showing some parameters of the optical imaging lens of Embodiment 4 of this utility model is shown;

[0030] Figure 13 A schematic diagram of the structure of the optical imaging lens of Embodiment 5 of this utility model is shown;

[0031] Figure 14 It shows Figure 13 A partial structural diagram of the optical imaging lens in the image;

[0032] Figure 15 A schematic diagram showing some parameters of the optical imaging lens of Embodiment 5 of this utility model is shown;

[0033] Figure 16 A partial structural schematic diagram of the optical imaging lens of Embodiment Six of this utility model is shown;

[0034] Figure 17 A schematic diagram of the structure of the optical imaging lens of Embodiment Seven of this utility model is shown;

[0035] Figure 18 It shows Figure 17 A partial structural diagram of the optical imaging lens in the image;

[0036] Figure 19 A partial structural schematic diagram of the optical imaging lens of Embodiment 8 of this utility model is shown;

[0037] Figure 20 A schematic diagram of the optical imaging lens of Embodiment 9 of this utility model is shown;

[0038] Figure 21 It shows Figure 20 A partial structural diagram of the optical imaging lens in the image;

[0039] Figure 22 A partial structural schematic diagram of the optical imaging lens of Embodiment 10 of this utility model is shown;

[0040] Figure 23 A schematic diagram of the structure of the optical imaging lens of Embodiment Eleven of this utility model is shown;

[0041] Figure 24 It shows Figure 23 A partial structural diagram of the optical imaging lens in the image;

[0042] Figure 25 A partial structural schematic diagram of the optical imaging lens of Embodiment Twelve of this utility model is shown;

[0043] Figure 26 The diagram shows the forces acting on the lower barrel of the optical imaging lens of this invention under the outer buckle structure.

[0044] Figure 27 A simulation diagram of the deformation of the lens barrel under the external buckle structure of the optical imaging lens of this utility model is shown;

[0045] Figure 28 The diagram shows the forces acting on the lens barrel under the inward-folding structure of the optical imaging lens of this invention.

[0046] Figure 29 A simulation diagram of the deformation of the lens barrel under the inward-folding structure of the optical imaging lens of this utility model is shown.

[0047] Figure 30The force diagram of the lens barrel under the prior art is shown;

[0048] Figure 31 A simulation diagram of the deformation of the lens barrel under existing technology is shown.

[0049] The above figures include the following reference numerals:

[0050] 10. Lens tube; 20. Front lens; 11. Fastening structure; 12. First fastening surface; 13. Fastening inclined surface; 14. Second fastening surface; 15. Stop surface; 21. Outer ring surface; 22. Support section; 23. First lens; 24. Second lens. Detailed Implementation

[0051] 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.

[0052] 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.

[0053] In this utility model, 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 used to limit this utility model.

[0054] To address the problem of poor stability of the front-end structure of optical imaging lenses in existing technologies, this invention provides an optical imaging lens.

[0055] like Figures 1 to 29As shown, the optical imaging lens includes a lens barrel 10 and a plurality of lenses. The lens barrel 10 has a housing space. The object-side end of the lens barrel 10 has a stop ring extending toward the optical axis of the optical imaging lens. The side of the stop ring facing the housing space has at least one fastening structure 11. The fastening structure 11 includes a first fastening surface 12, a fastening inclined surface 13, and a second fastening surface 14 connected in sequence. The second fastening surface 14 is disposed close to the optical axis relative to the first fastening surface 12. The plurality of lenses are housed in the housing space, and at least one of the plurality of lenses has a front lens 20 that abuts against the stop ring. The object side of the front lens 20 is fastened to the fastening structure 11. The inner wall surface of the lens barrel 10 also has at least one stop surface 15, and the outer ring surface 21 of the front lens 20 can rest on the stop surface 15. The maximum wall thickness T of the lens barrel 10 corresponding to the stop surface 15 and the distance B between the first fastening surface 12 and the second fastening surface 14 along the optical axis satisfy: 1 ​​< T / B < 20. The shortest diameter DK of the lens barrel 10 and the front lens 20 in fastening contact and the outer diameter DW of the front lens 20 satisfy: 0.2 < DK / DW < 1.0.

[0056] In the optical imaging lens of this application, the lens barrel 10 houses multiple lenses. A stop ring extends from the object-side end of the lens barrel 10 toward the optical axis of the optical imaging lens. To improve the assembly stability of the optical imaging lens, a fastening structure 11 is provided on the side of the stop ring facing the housing space to fasten the lens barrel 10 and its mating front lens 20 together. In the direction close to the optical axis, the fastening structure 11 is sequentially connected to a first fastening surface 12, a fastening inclined surface 13, and a second fastening surface 14. When the object-side surface of the front lens 20 is fastened to the fastening structure 11, the annular fastening inclined surface 13 effectively prevents the front lens 20 from loosening under external environmental impact. However, due to differences in fastening depth and fastening position, the machinability of the lens barrel 10 and the front lens 20 and the stability of the fastening are severely affected. By adjusting the relationship between the wall thickness and the fastening depth of the lens barrel 10 within a reasonable range (T / B), sufficient contact between the front lens 20 and the lens barrel 10 is ensured to provide support. Simultaneously, the sufficient wall thickness of the lens barrel 10 reduces the impact on the front lens 20 after deformation under stress, thus satisfying the stability requirements of the optical imaging lens and reducing performance degradation. This also considers the manufacturability of both the lens barrel 10 and the front lens 20. By controlling the DK / DW ratio within a reasonable range, the fastening position between the front lens 20 and the fastening structure 11 can be controlled, thereby adjusting the position affecting the front lens 20 after deformation under stress. This indirectly reduces the deformation of the front lens 20 and ensures uniform radial support for it, reducing the risk of misalignment during assembly and improving the stability and anti-interference capability of the optical imaging lens.

[0057] like Figures 1 to 25As shown, the angle A between the extension direction of the snap-fit ​​inclined surface 13 and the direction perpendicular to the optical axis satisfies: 40°≤A≤85°, and the distance B between the first snap-fit ​​surface 12 and the second snap-fit ​​surface 14 along the optical axis satisfies: 0.06mm≤B≤0.25mm. If the angle between the extension direction of the snap-fit ​​inclined surface 13 and the direction perpendicular to the optical axis is too small, it will increase the snap-fit ​​length between the front lens 20 and the lens barrel 10, resulting in excessively high requirements for the contours of the first snap-fit ​​surface 12 and the second snap-fit ​​surface 14 after molding. Simultaneously, if the angle is too small, the front lens 20 cannot provide sufficient radial restraint to the lens barrel 10, reducing the resistance of the lens barrel 10 to deformation under external forces. By controlling the angle A within a reasonable range, the snap-fit ​​inclined surface 13 has a larger angle relative to the optical axis, ensuring sufficient effective radial restraint between the front lens 20 and the lens barrel 10, which helps improve the stability of the front lens 20 within the lens barrel 10. Furthermore, if the distance B between the first fastening surface 12 and the second fastening surface 14 along the optical axis, i.e., the fastening depth, is too shallow, the front lens 20 will be loosely assembled within the lens barrel 10, resulting in poor stability and thus reducing the performance of the optical imaging lens. It will also reduce the resistance to external interference after the front lens 20 and lens barrel 10 are fastened. If the distance between the first fastening surface 12 and the second fastening surface 14 along the optical axis is too deep, it will alter the shape of the front lens 20 and lens barrel 10, leading to lower stability after molding. By controlling the fastening depth B within a reasonable range, the stability of the front lens 20 and lens barrel 10 is greatly improved, which is beneficial for the molding of the optical imaging lens.

[0058] like Figures 1 to 25 As shown, at most one of the snap-fit ​​inclined surface 13 and the stop surface 15 is spaced apart from the front lens 20 by a distance C, where the distance C satisfies: 0mm < C ≤ 0.02mm. By controlling the distance C within a reasonable range, the balance between the structural stability and reliability verification requirements of the optical imaging lens is met, and the shaking of the front lens 20 within the lens barrel 10 during assembly is avoided when the distance is too large, thus affecting the assembly stability. The fact that at most one of the snap-fit ​​inclined surface 13 and the stop surface 15 is spaced apart from the front lens 20 by a distance C means that the following combinations exist: 1) The snap-fit ​​inclined surface 13 is spaced apart from the object side surface of the front lens 20, and the stop surface 15 contacts the outer ring surface 21 of the front lens 20; 2) The snap-fit ​​inclined surface 13 contacts the object side surface of the front lens 20, and the stop surface 15 is spaced apart from the outer ring surface 21 of the front lens 20; 3) Both the snap-fit ​​inclined surface 13 and the stop surface 15 are in contact with the front lens 20.

[0059] It should be noted that in cases 1) and 2), the spacing creates a clearance fit constraint, while the contact creates an interference fit constraint. This combination is beneficial for the shape design and assembly stability of the lens barrel 10 and the front lens 20. In case 3), which is when the lens barrel 10 and the front lens 20 are assembled using an interference fit constraint, although the assembly is more difficult, it can also achieve better stability in reliability verification under certain conditions.

[0060] like Figures 1 to 25 As shown, the front lens 20 has a supporting section 22. The object-side surface of the supporting section 22 rests against the lens barrel 10, and the image-side surface of the supporting section 22 rests against one of the multiple lenses. The thickness Ta of the supporting section 22 along the optical axis and the minimum thickness Tb of the structural part of the front lens 20 along the optical axis satisfy the condition: 0 < Ta / Tb ≤ 2. The supporting section 22 is located in the structural part of the front lens 20, wherein the object-side surface of the supporting section 22 rests against the lens barrel 10, and the image-side surface of the supporting section 22 rests against the lens. By controlling Ta / Tb within a reasonable range, the ratio of the thickness of the supporting section 22 along the optical axis to the minimum thickness of the structural part of the front lens 20 can be controlled, effectively improving the roundness of the front lens 20 and the fastening structure 11, and improving the performance stability of the optical imaging lens. In addition, controlling this thickness ratio also reduces the impact of the fastening structure 11 on the overall shape design of the lens, avoiding excessive increase in the local thickness of the optical imaging lens due to the fastening structure 11.

[0061] like Figures 1 to 25 As shown, the outer ring surface 21 of the front lens 20 is set at an angle relative to the optical axis. The angle Ra between the outer ring surface 21 of the front lens 20 and the direction perpendicular to the optical axis, and the angle A between the snap-fit ​​inclined surface 13 and the optical axis, satisfy the following condition: 0.35 ≤ Ra / A ≤ 2.25. The angle between the outer ring surface 21 of the front lens 20 and the direction perpendicular to the optical axis controls the contact method between the outer ring surface 21 of the front lens 20 and the lens barrel 10. After the front lens 20 is snapped into place with the lens barrel 10, the engagement between the outer ring surface 21 of the front lens 20 and the positioning surface 15 of the lens barrel 10 serves as the second engagement position, allowing for a reduction in the control precision requirements for the outer ring surface 21 of the front lens 20 and the positioning surface 15 of the lens barrel 10. At the same time, reducing the angle between the outer ring surface 21 of the front lens 20 and the direction perpendicular to the optical axis is beneficial to the release process of the front lens 20, reducing the demolding force. By controlling Ra / A within a reasonable range, the overall stability of the front lens 20 within the lens barrel 10 is good. Of course, the angle between the outer ring surface 21 of the front lens 20 and the direction perpendicular to the optical axis can also be set to a right angle. A right angle is beneficial for controlling the size of the outer ring surface 21 of the front lens 20 and the stop surface 15 of the lens barrel 10.

[0062] Optionally, when the angle Ra between the outer ring surface 21 of the front lens 20 and the direction perpendicular to the optical axis is acute, the outer ring surface 21 of the front lens 20 extends away from the optical axis from the object side to the image side of the optical imaging lens. That is, the outer ring surface 21 of the front lens 20 gradually moves away from the optical axis from the object side to the image side of the optical imaging lens, thus satisfying the condition that the angle Ra between the outer ring surface 21 of the front lens 20 and the direction perpendicular to the optical axis is acute. Furthermore, the stop surface 15 of the lens barrel 10 also gradually moves away from the optical axis from the object side to the image side of the optical imaging lens, and both are extended at the same angle to prevent instability of the front lens 20 during assembly.

[0063] like Figures 1 to 25 As shown, the first fastening surface 12 abuts against the front lens 20, and the second fastening surface 14 is spaced apart from the front lens 20. The thickness Tc of the lens barrel 10 along the optical axis corresponding to the first fastening surface 12 and the thickness Td of the lens barrel 10 along the optical axis corresponding to the second fastening surface 14 satisfy the following condition: 0.1mm ≤ Min(Tc,Td) ≤ 1mm. When the thickness of the lens barrel 10 along the optical axis corresponding to the first fastening surface 12 or the thickness of the lens barrel 10 along the optical axis corresponding to the second fastening surface 14 is too small, the excessively thin local area of ​​the lens barrel 10 will lead to poor molding. When the thickness of the lens barrel 10 along the optical axis corresponding to the first fastening surface 12 or the thickness of the lens barrel 10 along the optical axis corresponding to the second fastening surface 14 is too large, it is not conducive to the miniaturization of the optical imaging lens. By controlling Min(Tc,Td) within a reasonable distance, the thickness of the lens barrel 10 is avoided from being too thin due to the snapping of the front lens 20 and the lens barrel 10. At the same time, poor forming caused by excessive thinness in local areas is also avoided, thereby preventing stray light risks or a decrease in imaging performance caused by assembly deformation.

[0064] like Figures 1 to 25 As shown, the first fastening surface 12 abuts against the front lens 20. The abutment length W between the first fastening surface 12 and the front lens 20 along the direction perpendicular to the optical axis, and the distance B between the first fastening surface 12 and the second fastening surface 14 along the optical axis, satisfy the following condition: 0.1 ≤ W / B ≤ 5. When the abutment length between the first fastening surface 12 and the front lens 20 along the direction perpendicular to the optical axis is too small, the force-bearing position at the front end of the lens barrel 10 is too close to the optical axis, which will increase the torque of the lens barrel 10 during assembly, increase the local deformation of the lens barrel 10 during assembly, and affect the assembly consistency of the optical imaging lens. When the abutment length between the first fastening surface 12 and the front lens 20 along the direction perpendicular to the optical axis is too large, the front end of the optical imaging lens is too large, reducing the stability of the optical imaging lens. By controlling the ratio of the contact surface length to the fastening depth within a reasonable range, assembly instability caused by the force-bearing position of the lens barrel 10 being too close to the optical axis when the contact surface abutment length is too short can be avoided.

[0065] It should be noted that when the fastening inclined surface 13 of the fastening structure 11 extends from the object side to the image side in a direction close to the optical axis, the fastening of the lens barrel 10 and the front lens 20 is called an external fastening structure. Using an external fastening structure can greatly reduce the risk of deformation of the lens barrel 10 during assembly and improve product yield. When the fastening inclined surface 13 of the fastening structure 11 extends from the object side to the image side in a direction away from the optical axis, the fastening of the lens barrel 10 and the front lens 20 is called an internal fastening structure. Using an internal fastening structure is beneficial to the surface design of the front lens 20 and reduces the difficulty of processing and forming the front lens 20.

[0066] It should be noted that, as Figures 30 to 31 As shown, in the prior art, optical imaging lenses employ a conventional non-fastening structure, meaning the front lens 20 and the lens barrel 10 are not fastened together by the non-fastening structure 11. After applying a radial tension to the front end of the lens barrel 10, the radial deformation is simulated. Figure 31 Simulation results show that both the lens and the lens barrel underwent significant deformation. However, this application... Figures 26 to 29 As shown, when the same pulling force is applied to an optical imaging lens with an external or internal clamping structure, the radial deformation of the front lens 20 and the lens barrel 10 after being subjected to external force is significantly smaller than that of the conventional structure.

[0067] Example 1

[0068] like Figure 2 and Figure 3 As shown, the optical imaging lens includes a lens barrel 10 and a front lens 20. The lens barrel 10 has a receiving space. The object side of the lens barrel 10 has a stop ring extending toward the optical axis of the optical imaging lens. The side of the stop ring facing the receiving space has a fastening structure 11. The fastening structure 11 includes a first fastening surface 12, a fastening inclined surface 13, and a second fastening surface 14 connected in sequence. The second fastening surface 14 is positioned close to the optical axis relative to the first fastening surface 12. Multiple lenses are housed in the receiving space. Among the multiple lenses, there is a front lens 20 that abuts against the stop ring. The object side of the front lens 20 is fastened to the fastening structure 11. The inner wall surface of the lens barrel 10 also has a stop surface 15. The outer ring surface 21 of the front lens 20 can abut against the stop surface 15. The stop surface 15 and the outer ring surface 21 are both straight arms. The locking bevel 13 of the lens barrel 10 and the front lens 20 is in the form of an external locking structure. The locking bevel 13 and the object side of the front lens 20 are spaced apart, and the stop surface 15 is in direct contact with the outer ring surface 21.

[0069] like Figure 2 and Figure 3As shown, the lens barrel 10 and the front lens 20 are in an outward-fastening structure, and the lens barrel 10 and the front lens 20 have sufficient resistance to deformation. That is, when the outer wall of the lens barrel 10 is subjected to radial tension, the front lens 20 can effectively prevent the outer wall of the lens barrel 10 from being stretched outward, reducing the performance degradation caused by the loosening of the front lens 20 due to the deformation of the inner wall surface of the lens barrel 10.

[0070] Example 2

[0071] like Figures 4 to 7 As shown, unlike Embodiment 1, in Embodiment 2, the optical imaging lens fastening inclined surface 13 directly contacts the object side surface of the front lens 20, and the stop surface 15 and the outer ring surface 21 are spaced apart. This arrangement provides a more secure connection between the fastening structure 11 and the front lens 20, enhances the structural stability of the optical imaging lens, reduces the displacement of the front lens 20 under external forces, and helps maintain the optical performance of the optical imaging lens. It also further reduces the assembly difficulty between the stop surface 15 and the outer ring surface 21.

[0072] Example 3

[0073] like Figure 8 and Figure 10 As shown, unlike Embodiment 1, the optical imaging lens barrel 10 and the front lens 20 of Embodiment 3 are fitted in an inwardly snapped structure. When the outer wall of the barrel 10 is stretched, the deformation effect of the snapping inclined surface 13 of the barrel 10 will be less than the deformation effect of the outer wall of the barrel 10, thereby reducing the performance degradation caused by the loosening of the front lens 20 due to the deformation of the inner wall surface of the barrel 10.

[0074] Example 4

[0075] like Figure 11 and Figure 12 As shown, unlike Embodiment 3, in Embodiment 4, the snap-fit ​​inclined surface 13 of the optical imaging lens directly contacts the object side surface of the front lens 20, and the stop surface 15 and the outer ring surface 21 are spaced apart. This arrangement provides a more secure connection between the snap-fit ​​structure 11 and the front lens 20, enhances the structural stability of the optical imaging lens, reduces the displacement of the front lens 20 under external forces, and helps maintain the optical performance of the optical imaging lens. It also further reduces the assembly difficulty between the stop surface 15 and the outer ring surface 21.

[0076] Example 5

[0077] like Figures 13 to 15 As shown, unlike Embodiment 1, in Embodiment 5, the optical imaging lens stop surface 15 and the outer ring surface 21 are both inclined walls, that is, the extension direction is at an angle to the optical axis, which is beneficial for the demolding and assembly guidance of the front lens 20.

[0078] Example 6

[0079] like Figure 16 As shown, unlike Embodiment 5, in Embodiment 6, the snap-fit ​​inclined surface 13 of the optical imaging lens directly contacts the object side surface of the front lens 20, and the stop surface 15 and the outer ring surface 21 are spaced apart. The optical imaging lens of this embodiment can achieve both excellent processing and structural stability.

[0080] Example 7

[0081] like Figure 17 and Figure 18 As shown, unlike Embodiment 5, the lens barrel 10 and the front lens 20 of the optical imaging lens in Embodiment 7 are fitted together in an inward-folding structure.

[0082] Example 8

[0083] like Figure 19 As shown, unlike Embodiment 7, in Embodiment 8, the snap-fit ​​inclined surface 13 of the optical imaging lens is in direct contact with the object side surface of the front lens 20, and the stop surface 15 and the outer ring surface 21 are spaced apart.

[0084] Example 9

[0085] like Figure 20 and Figure 21 As shown, unlike Embodiment 1, the number of front lens 20 and fastening structure 11 is different.

[0086] In this embodiment, the optical imaging lens includes two front-end lenses 20 and two fastening structures 11. The two fastening structures 11 are configured one-to-one with the two front-end lenses 20. The two front-end lenses 20 are a first lens 23 and a second lens 24 that rest sequentially along the object side to the image side of the optical imaging lens. The fastening structure 11 corresponding to the second lens 24 is positioned further away from the optical axis than the fastening structure 11 corresponding to the first lens 23. At this time, the object-side surface of the first lens 23 rests with the fastening structure 11 closer to the optical axis, and the object-side surface of the second lens 24 rests with the fastening structure 11 farther from the optical axis. Specifically, the object-side surface of the first lens 23 is fastened to the fastening structure 11 closer to the optical axis, and the object-side surface of the second lens 24 is fastened to the fastening structure 11 farther from the optical axis. The arrangement of the two fastening structures 11 greatly enhances the assembly stability of the optical imaging lens.

[0087] Optionally, from the object side to the image side of the optical imaging lens, the fastening bevels 13 of the two fastening structures 11 can both extend towards or away from the optical axis, or one fastening bevel 13 of the fastening structure 11 can extend towards the optical axis while the other fastening bevel 13 extends away from the optical axis. That is, when both fastening structures 11 extend simultaneously towards or away from the optical axis, the difficulty of assembling the lens barrel 10 with the two front lenses 20 can be reduced. When the extension directions of the two fastening structures 11 are different, bidirectional restraint can be provided for the first lens 23 and the second lens 24.

[0088] In this embodiment, the two fastening positions are configured identically. Specifically, both fastening points are designed as follows: the stop surface 15 and the outer ring surface 21 are both straight arms; the lens barrel 10 and the front lens 20 have an external fastening structure; the fastening inclined surface 13 is spaced apart from the object side surface of the front lens 20; and the stop surface 15 and the outer ring surface 21 are in direct contact. This dual fastening structure further mitigates the deformation of the lens barrel 10 under external forces.

[0089] It should be noted that in this embodiment, the parameters related to the second lens 24 are all labeled in the form of A2, B2, C2, corresponding to parameters A, B, and C.

[0090] Example 10

[0091] like Figure 22 As shown, unlike Embodiment Nine, in Embodiment Ten, the snap-fit ​​inclined surface 13 of the optical imaging lens is in direct contact with the object side surface of the front lens 20, and the stop surface 15 of the first lens 23 and the second lens 24 are spaced apart from the outer ring surface 21.

[0092] Example 11

[0093] like Figure 23 and Figure 24 As shown, unlike Embodiment Nine, the lens barrel 10 and the front lens 20 of the optical imaging lens in Embodiment Eleven have an inwardly snapped structure, which can further improve the effect of lens fitting after the lens barrel 10 is deformed by external force. The snapping inclined surface 13 of the first lens 23 and the second lens 24 is spaced apart from the object side surface of the front lens 20, and the positioning surface 15 of the first lens 23 and the second lens 24 is in direct contact with the outer ring surface 21.

[0094] Example 12

[0095] like Figure 25 As shown, unlike Embodiment Eleven, in the optical imaging lens of Embodiment Twelve, the two snap-fit ​​inclined surfaces 13 are in direct contact with the object surfaces of the two front lenses 20 respectively, and the two stop surfaces 15 are spaced apart from the two outer ring surfaces 21 respectively.

[0096] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0097] 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.

[0098] 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.

[0099] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An optical imaging lens, characterized in that, include: The lens barrel (10) has a receiving space. The object-side end of the lens barrel (10) has a stop ring extending toward the optical axis of the optical imaging lens. The stop ring has at least one fastening structure (11) on the side facing the receiving space. The fastening structure (11) includes a first fastening surface (12), a fastening inclined surface (13), and a second fastening surface (14) connected in sequence. The second fastening surface (14) is disposed close to the optical axis relative to the first fastening surface (12). Multiple lenses are housed within the receiving space. Among the multiple lenses, at least one front lens (20) abuts against the stop ring. The object side of the front lens (20) is fastened to the fastening structure (11). The inner wall of the lens barrel (10) also has at least one stop surface (15). The outer ring surface (21) of the front lens (20) can abut against the stop surface (15). Among them, the maximum wall thickness T of the lens barrel (10) corresponding to the gear position surface (15) and the distance B between the first fastening surface (12) and the second fastening surface (14) along the optical axis direction satisfy: 1 ​​< T / B < 20; The diameter DK at the midpoint of the contact surface between the lens barrel (10) and the front lens (20) and the outer diameter DW of the front lens (20) satisfy the following condition: 0.2 < DK / DW < 1.

0.

2. The optical imaging lens according to claim 1, characterized in that, The angle A between the extension direction of the snapping inclined surface (13) and the direction perpendicular to the optical axis satisfies: 40°≤A≤85°, and the distance B between the first snapping surface (12) and the second snapping surface (14) along the optical axis satisfies: 0.06mm≤B≤0.25mm.

3. The optical imaging lens according to claim 1, characterized in that, At most one of the snap-fit ​​inclined surface (13) and the stop surface (15) is spaced apart from the front lens (20) by a distance C, wherein the distance C satisfies: 0mm < C ≤ 0.02mm.

4. The optical imaging lens according to claim 1, characterized in that, The front lens (20) has a supporting section (22) in its structural part. The object side of the supporting section (22) abuts against the lens barrel (10), and the image side of the supporting section (22) abuts against one of the plurality of lenses. The thickness Ta of the supporting section (22) along the optical axis and the minimum thickness Tb of the structural part of the front lens (20) along the optical axis satisfy the following: 0 < Ta / Tb ≤ 2.

5. The optical imaging lens according to claim 1, characterized in that, The outer ring surface (21) of the front end lens (20) is set at an angle relative to the optical axis. The angle Ra between the outer ring surface (21) of the front end lens (20) and the direction perpendicular to the optical axis, and the angle A between the fastening inclined surface (13) and the optical axis, satisfy the following: 0.35≤Ra / A≤2.

25.

6. The optical imaging lens according to claim 5, characterized in that, From the object side to the image side of the optical imaging lens, the outer ring surface (21) of the front lens (20) extends in a direction away from the optical axis.

7. The optical imaging lens according to claim 1, characterized in that, The first fastening surface (12) abuts against the front lens (20), and the second fastening surface (14) is spaced apart from the front lens (20). The thickness Tc of the lens barrel (10) corresponding to the first fastening surface (12) along the optical axis and the thickness Td of the lens barrel (10) corresponding to the second fastening surface (14) along the optical axis satisfy the following: 0.1mm≤Min(Tc,Td)≤1mm.

8. The optical imaging lens according to claim 1, characterized in that, The first fastening surface (12) abuts against the front lens (20), and the abutment length W between the first fastening surface (12) and the front lens (20) along the direction perpendicular to the optical axis, and the distance B between the first fastening surface (12) and the second fastening surface (14) along the optical axis satisfy the following: 0.1≤W / B≤5.

9. The optical imaging lens according to any one of claims 1 to 8, characterized in that, The optical imaging lens includes two front-end lenses (20) and two fastening structures (11). The two fastening structures (11) are arranged in a one-to-one correspondence with the two front-end lenses (20). The two front-end lenses (20) are a first lens and a second lens that are sequentially supported along the object side to the image side of the optical imaging lens. The fastening structure (11) corresponding to the second lens is arranged further away from the optical axis than the fastening structure (11) corresponding to the first lens.

10. The optical imaging lens according to claim 9, characterized in that, From the object side to the image side of the optical imaging lens, the fastening slopes (13) of the two fastening structures (11) extend toward or away from the optical axis.

Images