Lens structure simulation design method and lens structure

Abstract

This invention relates to the field of lens technology, specifically to a lens structure simulation design method and a lens structure. The simulation design method includes the following steps: designing a lens structure, which includes a lens barrel, end lenses, and lens groups, wherein the end lenses include intersecting snap-fit ​​surfaces and adhesive surfaces; linearly fitting tensile strength data obtained from actual experiments to establish a mathematical model of the lens structure; establishing a three-dimensional model of the lens structure based on the mathematical model, and processing the three-dimensional model; importing the three-dimensional model into simulation software; setting the solution conditions for the three-dimensional model, and obtaining the quantitative relationship between adhesive force F1 and snap-fit ​​force F2 based on force balance and orthogonal decomposition. This invention performs mechanical simulation on the designed miniaturized lens structure, enabling the lens to meet radial miniaturization requirements while performing simulation calculations and verifications on the overall structure, ensuring the lens structure design is qualified.

Description

Technical Field

[0001] This invention relates to the field of lens technology, specifically to a lens structure simulation design method and a lens structure. Background Technology

[0002] In recent years, with the rapid development of information technology, people's high standards for product quality and personal experience have forced smartphones to be constantly updated and iterated; among them, in order to improve the portability of mobile phones, the miniaturization of mobile phone cameras is the main development direction of major manufacturers.

[0003] The lens module is a crucial component of a mobile phone camera, typically comprising lenses, a lens barrel, and a lens mount. Generally, a lens module houses multiple lenses, assembled within the lens barrel using a specific method. The last lens element is usually connected to the lens barrel via a retaining ring. This method requires provisions within the lens barrel to accommodate the retaining ring, increasing the radial dimension of the lens barrel and hindering lens miniaturization. Therefore, it is necessary to design a lens structure through simulation that allows for radial miniaturization, with the overall structure rationally controlled through simulation calculations to ensure the lens product meets quality standards. Summary of the Invention

[0004] The purpose of this invention is to at least solve one of the technical problems existing in the prior art, and to provide a lens structure simulation design method and lens structure.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a lens structure simulation design method, comprising the following steps:

[0006] Step 1: Design the lens structure, which includes a lens barrel, an end lens, and a lens group. The outer diameter of the upper end of the lens barrel is not greater than the outer diameter of the end lens. The end lens includes intersecting snap-fit ​​surfaces and adhesive surfaces. The snap-fit ​​surfaces are snapped to the inner side of the lens barrel by an interference fit. The adhesive surfaces are bonded to the upper end face of the lens barrel by an adhesive. The lens group is fixed inside the lens barrel.

[0007] Step 2: Linearly fit the tensile strength data obtained from the actual test to obtain the simulated material parameters of the colloid and establish a mathematical model of the lens structure. The clamping force between the clamping surface and the inner side of the lens barrel is F2=μ*Fn, where Fn is the pressure of the clamping surface on the inner side of the lens barrel and μ is the coefficient of sliding friction.

[0008] Step 3: Establish a three-dimensional model of the lens structure based on the mathematical model, and perform model processing on the three-dimensional model;

[0009] Step 4: Import the 3D model into the simulation software and set the simulation parameters for the 3D model;

[0010] Step 5: Set the solution conditions for the three-dimensional model. Fix the lower end face of the lens barrel axially, set the displacement to 0, and leave the other directions free. Apply an axial thrust F to the lens group to verify the force transmission through the lens group at the bonding point between the end lens and the lens barrel. The quantitative relationship between the bonding force F1 and the clamping force F2 can be obtained according to the force balance and orthogonal decomposition method.

[0011] Furthermore, in step 1, the lens group is disposed below the end lens, the maximum outer diameter of the lens group is smaller than the outer diameter of the end lens, and the lens group abuts against the outer diameter area of ​​the end lens.

[0012] Furthermore, in step 2, a tensile structure model of the bonding between the end lens and the lens barrel is established, and then linear fitting is performed to obtain the simulated material parameters of the colloid.

[0013] Furthermore, in step 4, the 3D model is imported into the simulation software ANSYS WORKBENCH. The simulation software is used to mesh the 3D model, with hexahedral mesh as the main type. The mesh is further refined for the colloid and the edge areas where the end lens and lens barrel connect.

[0014] Furthermore, in step 4, material parameters are set for the three-dimensional model; the lens barrel is made of plastic, the end lens is made of plastic lens material, and the material parameters of the colloid are the simulation material parameters obtained in step 2.

[0015] Furthermore, in step 4, contact settings are applied to the 3D model; frictional contact is used between each component of the lens structure, with the contact type being AUTOMATIC_GENERAL, the friction coefficient being 0.3, and the dynamic coefficient being 0.2.

[0016] Furthermore, in step 5, F m F is the force transmitted from the thrust F to the adhesive joint. x For F m The component of force in the x-direction.

[0017] Furthermore, in step 5, the solution condition is set to ensure that the overall strength of the lens structure meets a thrust F of more than 30N;

[0018] Simulation results show that the adhesive bonding force F1 between the lens barrel and the end lens needs to be above 23N, and the bonding area S after the adhesive cures should be maintained at 7mm. 2 The thickness of the colloid D must be maintained above 0.02 mm; the interference fit connection strength F2 between the lens barrel and the end lens must be above 7 N.

[0019] Furthermore, the length L of the interference fit between the lens barrel and the end lens should be maintained at 0.05mm≤L≤0.15mm, and the included angle α between the snap-fit ​​surface and the adhesive surface should be within the range of 90°≤a≤135°; after curing, the distance between the inner surface of the colloid and the inner surface of the lens barrel should be greater than 0.02mm, and the gap between the outer surface of the colloid and the outer surface of the lens barrel should be greater than 0.05mm.

[0020] The present invention also provides a lens structure, characterized in that it includes a lens barrel, an end lens, and a lens assembly. The outer diameter of the upper end of the lens barrel is not greater than the outer diameter of the end lens. The end lens includes an intersecting snap-fit ​​surface and an adhesive surface. The snap-fit ​​surface is snapped onto the inner side of the lens barrel by an interference fit. The adhesive surface is bonded to the upper end surface of the lens barrel by an adhesive. The lens assembly is fixed inside the lens barrel.

[0021] Furthermore, the bonding area S after the adhesive has cured should be maintained at 7mm. 2 The thickness D of the colloid must be maintained above 0.02mm; the length L of the interference fit between the lens barrel and the end lens should be maintained at 0.05mm≤L≤0.15mm; the included angle α between the snap-fit ​​surface and the adhesive surface must be within the range of 90°≤a≤135°; after curing, the distance between the inner surface of the colloid and the inner surface of the lens barrel must be greater than 0.02mm, and the gap between the outer surface of the colloid and the outer surface of the lens barrel must be greater than 0.05mm.

[0022] Furthermore, the lens group is disposed below the end lens, the maximum outer diameter of the lens group is smaller than the outer diameter of the end lens, and the lens group abuts against the outer diameter area of ​​the end lens.

[0023] As can be seen from the above description of the present invention, compared with the prior art, the lens structure simulation design method of the present invention has at least one of the following beneficial effects:

[0024] 1. The lens simulation design method of the present invention performs mechanical simulation on the designed miniaturized lens structure, so that the lens can meet the requirements of miniaturization in the radial and axial directions, while performing simulation calculations and simulation verification on the overall structure to ensure that the lens structure design is qualified.

[0025] 2. The lens structure designed by the lens simulation design method of the present invention has the end lens's snap-fit ​​surface snapped to the inner side of the lens barrel by an interference fit, and the end lens's adhesive surface is bonded to the upper end surface of the lens barrel by an adhesive, thereby achieving lens miniaturization. Furthermore, the strength of the adhesive structure and the interference fit that meet the lens strength requirements are calculated through mechanical simulation.

[0026] 3. The lens structure of the present invention removes the tail end of the lens barrel that originally enclosed the end lens, which is very beneficial for miniaturizing the lens in the radial direction. At the same time, the length of the lens barrel is reduced and the front cover is not required, thus reducing costs. Furthermore, the end lens is fixed on the lens barrel by a dual fixing method of snap-fit ​​and adhesive, ensuring that the overall structural strength of the lens meets the usage requirements. Attached Figure Description

[0027] Figure 1 This is a flowchart illustrating the steps of a lens structure simulation design method in a preferred embodiment of the present invention.

[0028] Figure 2 This is a cross-sectional schematic diagram of the lens structure in a preferred embodiment of the present invention;

[0029] Figure 3 for Figure 2 Enlarged view of point A;

[0030] Figure 4 This is a linear fitting curve of the adhesive area and adhesive strength of the colloid in a preferred embodiment of the present invention;

[0031] Figure 5 This is a mechanical simulation result diagram of the lens structure in a preferred embodiment of the present invention;

[0032] Figure 6 This is a comparison of stray light analysis results between the present invention and conventional lenses; Figure 6 Figure a shows the stray light analysis results for a standard lens. Figure 6 b is a diagram showing the stray light analysis results of this invention;

[0033] Figure 7 This is a light path diagram showing the reflection from the inner wall of the rear of a standard lens.

[0034] The labels in the diagram are as follows: 1. Lens tube; 2. End lens; 3. Lens group; 4. Colloid. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0036] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0038] Reference Figure 1 As shown in the preferred embodiment of the present invention, a lens structure simulation design method includes the following steps:

[0039] Step 1: Design the lens structure, which includes a lens barrel 1, an end lens 2, and a lens group 3. The outer diameter of the upper end of the lens barrel 1 is not greater than the outer diameter of the end lens 2. The end lens 2 includes intersecting snap-fit ​​surfaces and adhesive surfaces. The snap-fit ​​surfaces are snapped onto the inner surface of the lens barrel 1 by an interference fit, and the adhesive surfaces are bonded to the upper end face of the lens barrel 1 by an adhesive 4. The lens group 3 is fixed inside the lens barrel 1. (Refer to...) Figures 2-3 As shown;

[0040] Step 2: Linearly fit the tensile strength data obtained from the actual test to obtain the simulated material parameters of colloid 4, and establish a mathematical model of the lens structure, wherein the clamping force between the clamping surface and the inner side of the lens barrel 1 is F2=μ*Fn, where Fn is the pressure of the clamping surface on the inner side of the lens barrel 1, and μ is the sliding friction coefficient.

[0041] Step 3: Establish a three-dimensional model of the lens structure based on the mathematical model, and perform model processing on the three-dimensional model;

[0042] Step 4: Import the 3D model into the simulation software and set the simulation parameters for the 3D model;

[0043] Step 5: Set the solution conditions for the three-dimensional model. Fix the lower end face of the lens barrel 1 axially, set the displacement to 0, and leave the other directions free. Apply an axial thrust F to the lens group 3 to verify the force at the bonding point between the end lens 2 and the lens barrel 1 after the transmission through the lens group 3. The quantitative relationship between the bonding force F1 and the clamping force F2 can be obtained according to the force balance and orthogonal decomposition method.

[0044] The lens simulation design method of the present invention performs mechanical simulation on the designed miniaturized lens structure, so that the lens can meet the requirements of miniaturization in the radial and axial directions, while performing simulation calculations and verification on the overall structure to ensure that the lens structure design is qualified. In the lens structure designed by the lens simulation design method of the present invention, the snap-fit ​​surface of the end lens 2 is snapped to the inner side of the lens barrel 1 by an interference fit, and the adhesive surface of the end lens 2 is bonded to the upper end surface of the lens barrel 1 by an adhesive 4, thereby achieving lens miniaturization. Furthermore, the strength of the adhesive 4 structure and the interference fit that meet the lens strength requirements are calculated through mechanical simulation.

[0045] As a preferred embodiment of the present invention, it may also have the following additional technical features:

[0046] In this embodiment, in step 1, the lens group 3 is disposed below the end lens 2. The maximum outer diameter of the lens group 3 is smaller than the outer diameter of the end lens 2, and the lens group 3 abuts against the outer diameter region of the end lens 2. The lens group 3 includes a plurality of lenses disposed within the lens barrel 1 and located below the end lens 2. The outer diameter of all lenses in the lens group 3 is smaller than the outer diameter of the end lens 2. Therefore, the outer diameter of the end lens 2 determines the maximum outer diameter of the entire lens. By bonding the end lens 2 to the upper end of the lens barrel 1, the end lens 2 is not enclosed by the lens barrel 1, ensuring that the outer diameter of the upper end of the lens barrel 1 is not greater than the outer diameter of the end lens 2. This significantly reduces the maximum outer diameter of the lens, satisfying the miniaturization requirement in the radial direction. The top of the lens group 3 is bonded and fixed to the lens barrel 1, eliminating the need for a spacer between the lens group 3 and the end lens 2, thus reducing manufacturing costs.

[0047] In this embodiment, in step 2, a tensile structure model of the bonding between the end lens 2 and the lens barrel 1 is established, and then linear fitting is performed to obtain the simulated material parameters of the colloid 4. This ensures the accuracy of the simulation results. The linear fitting curve is shown below. Figure 4 As shown.

[0048] In this embodiment, in step 4, the 3D model is imported into the simulation software ANSYS WORKBENCH. The simulation software then meshes the 3D model, primarily using hexahedral meshes, and refines the mesh at the junction of the colloid 4, the end lens 2, and the lens barrel 1. Refining the mesh at the junction of the end lens 2 and the lens barrel 1 improves the accuracy of the simulation.

[0049] In this embodiment, in step 4, material parameters are set for the 3D model; the lens barrel 1 is made of plastic, the end lens 2 is made of plastic lens material, and the material parameters of the colloid 4 are the simulated material parameters obtained in step 2. The material is a key factor affecting stress, therefore it is also a primary parameter. The lens barrel 1 uses the plastic material commonly used in mobile phone lenses, and the end lens 2 also uses the plastic lens material commonly used in mobile phone lenses, but this is not a limitation and can be adjusted according to the specific lens model.

[0050] In this embodiment, in step 4, contact settings are applied to the three-dimensional model; frictional contact is used between each component of the lens structure, with the contact type being AUTOMATIC_GENERAL, the friction coefficient being 0.3, and the dynamic coefficient being 0.2.

[0051] In this embodiment, in step 5, F m F is the force transmitted from the thrust F to the adhesive joint. x For F m The component of force in the x-direction.

[0052] In this embodiment, in step 5, the solution condition is set to require the overall strength of the lens structure to meet a thrust F of more than 30N;

[0053] Simulation results show that the adhesive force F1 between the lens barrel 1 and the end lens 2 of the colloid 4 needs to be above 23N, and the bonding area S after the adhesive cures should be maintained at 7mm. 2 The thickness D of the colloid 4 must be maintained above 0.02mm; the interference fit connection strength F2 between the lens barrel 1 and the end lens 2 must be above 7N.

[0054] Since lens group 3 is located inside lens barrel 1, while end lens 2 is exposed outside lens barrel 1, end lens 2 is the easiest to detach. The overall strength of the lens structure depends on the connection strength of end lens 2. One of the important difficulties of the exposed end lens 2 scheme is whether the connection strength of the exposed lens can be guaranteed. The main sources of strength are the magnitude of adhesive force and the magnitude of interference fit. Therefore, based on experimental and simulation analysis, the overall strength of the lens structure is set to meet the thrust F of more than 30N, and this requirement is used as the solution condition.

[0055] Simulation results show that the adhesive force F1 between the lens barrel 1 and the end lens 2 of the colloid 4 needs to be above 23N, and the bonding area S after the adhesive cures should be maintained at 7mm. 2The thickness D of the colloid 4 must be maintained above 0.02mm; the interference fit connection strength F2 between the lens barrel 1 and the end lens 2 must be above 7N. Simulation methods provide guidance for lens structural design and verify the feasibility of the lens structure. For different models of this lens structure, corresponding parameters can be changed to match the simulation. The mechanical simulation results are as follows: Figure 5 As shown.

[0056] In this embodiment, the length L of the interference fit between the lens barrel 1 and the end lens 2 should be maintained at 0.05mm≤L≤0.15mm, and the included angle α between the snap-fit ​​surface and the adhesive surface should be within the range of 90°≤a≤135°; after curing, the distance between the inner side of the colloid 4 and the inner side of the lens barrel 1 should be greater than 0.02mm, and the gap between the outer side of the colloid 4 and the outer side of the lens barrel 1 should be greater than 0.05mm.

[0057] The present invention also provides a lens structure, characterized in that it includes a lens barrel 1, an end lens 2, and a lens group 3. The outer diameter of the upper end of the lens barrel 1 is not greater than the outer diameter of the end lens 2. The end lens 2 includes an intersecting snap-fit ​​surface and an adhesive surface. The snap-fit ​​surface is snapped to the inner side of the lens barrel 1 by an interference fit. The adhesive surface is bonded to the upper end surface of the lens barrel 1 by an adhesive 4. The lens group 3 is fixed inside the lens barrel 1.

[0058] The lens structure of this invention removes the tail end portion of the lens barrel 1 that originally enclosed the end lens 2, which is highly beneficial for miniaturizing the lens in the radial direction. Simultaneously, the reduced length of the lens barrel 1 and the elimination of the need for a front cap lower costs. Furthermore, the end lens 2 is fixed to the lens barrel 1 using a dual method of snap-fit ​​and adhesive bonding, ensuring the overall structural strength of the lens meets usage requirements. Because the tail end portion of the lens barrel 1 that originally enclosed the end lens 2 is removed, stray light reflected from the tail end structure of the lens barrel 1 is effectively reduced. (Refer to...) Figure 6 and Figure 7 As shown, in Figure 6 It is evident that the stray light produced by this invention is significantly less than that produced by conventional lenses. Figure 7 The reason why conventional lenses produce more stray light is due to reflections at the rear end of the lens barrel.

[0059] In this embodiment, the bonding area S after the adhesive has cured should be maintained at 7mm. 2 The thickness D of the colloid 4 must be maintained above 0.02mm; the length L of the interference fit between the lens barrel 1 and the end lens 2 should be maintained at 0.05mm≤L≤0.15mm; the included angle α between the snap-fit ​​surface and the adhesive surface must be within the range of 90°≤a≤135°; after curing, the distance between the inner side of the colloid 4 and the inner side of the lens barrel 1 must be greater than 0.02mm, and the gap between the outer side of the colloid 4 and the outer side of the lens barrel 1 must be greater than 0.05mm.

[0060] In this embodiment, the lens group 3 is disposed below the end lens 2. The maximum outer diameter of the lens group 3 is smaller than the outer diameter of the end lens 2, and the lens group 3 abuts against the outer diameter region of the end lens 2. The abutment between the lens group 3 and the outer diameter region of the end lens 2 fixes the lens group 3, and also eliminates the spacer between the lens group 3 and the end lens 2 in conventional lenses, reducing cost expenditure.

[0061] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concept, should be covered within the scope of protection of the present invention.

Claims

1. A lens structure simulation design method, characterized in that, Includes the following steps: Step 1, design the lens structure, which includes a lens barrel (1), an end lens (2), and a lens group (3). The outer diameter of the upper end of the lens barrel (1) is not greater than the outer diameter of the end lens (2). The end lens (2) includes intersecting snap-fit ​​surfaces and adhesive surfaces. The snap-fit ​​surfaces are snapped to the inner side of the lens barrel (1) by an interference fit. The adhesive surfaces are bonded to the upper end surface of the lens barrel (1) by an adhesive (4). The lens group (3) is fixed inside the lens barrel (1). Step 2, linearly fit the tensile strength data obtained from the actual test to obtain the simulated material parameters of the colloid (4) and establish a mathematical model of the lens structure, wherein the clamping force between the clamping surface and the inner side of the lens barrel (1) is F2=μ*Fn, Fn is the pressure of the clamping surface on the inner side of the lens barrel (1), and μ is the sliding friction coefficient. Step 3: Establish a three-dimensional model of the lens structure based on the mathematical model, and perform model processing on the three-dimensional model; Step 4: Import the 3D model into the simulation software and set the simulation parameters for the 3D model; Step 5: Set the solution conditions for the three-dimensional model. Fix the lower end face of the lens barrel (1) axially, set the displacement to 0, and leave the other directions free. Apply an axial thrust F to the lens group (3) to verify the force at the bonding point between the end lens (2) and the lens barrel (1) after the transmission through the lens group (3). The quantitative relationship between the bonding force F1 and the clamping force F2 can be obtained according to the force balance and orthogonal decomposition method.

2. The lens structure simulation design method according to claim 1, characterized in that, In step 1, the lens group (3) is positioned below the end lens (2), the maximum outer diameter of the lens group (3) is smaller than the outer diameter of the end lens (2), and the lens group (3) abuts against the outer diameter area of ​​the end lens (2).

3. The lens structure simulation design method according to claim 1, characterized in that, In step 2, a tensile structure model of the bonding between the end lens (2) and the lens barrel (1) is established, and then linear fitting is performed to obtain the simulated material parameters of the colloid (4).

4. The lens structure simulation design method according to claim 1, characterized in that, In step 4, the three-dimensional model is imported into the simulation software ANSYS WORKBENCH. The three-dimensional model is meshed using the simulation software. The mesh is mainly hexahedral mesh, and the mesh is refined at the edge of the connection between the colloid (4), the end lens (2), and the lens barrel (1).

5. The lens structure simulation design method according to claim 1, characterized in that, In step 4, the material parameters of the three-dimensional model are set; the lens barrel (1) is made of plastic, the end lens (2) is made of plastic lens material, and the material parameters of the colloid (4) are the simulation material parameters obtained in step 2.

6. The lens structure simulation design method according to claim 1, characterized in that, In step 4, contact settings are applied to the 3D model; frictional contact is used between each component of the lens structure, with the contact type being AUTOMATIC_GENERAL, the friction coefficient being 0.3, and the dynamic coefficient being 0.

2.

7. The lens structure simulation design method according to claim 1, characterized in that, In step 5, F m F is the force transmitted from the thrust F to the adhesive joint. x For F m The component of force in the x-direction.

8. The lens structure simulation design method according to claim 1, characterized in that, In step 5, the solution condition is set to ensure that the overall strength of the lens structure meets a thrust F of more than 30N; Simulation results show that the adhesive force F1 between the lens barrel (1) and the end lens (2) of the colloid (4) needs to be above 23N, and the bonding area S after the adhesive has cured should be maintained at 7mm. 2 The thickness D of the colloid (4) must be maintained above 0.02 mm; the interference fit connection strength F2 between the lens barrel (1) and the end lens (2) must be above 7 N.

9. The lens structure simulation design method according to claim 8, characterized in that, The length L of the interference fit between the lens barrel (1) and the end lens (2) should be kept within 0.05mm≤L≤0.15mm. The included angle a between the snap-fit ​​surface and the adhesive surface should be within the range of 90°≤a≤135°. After curing, the distance between the inner side of the colloid (4) and the inner side of the lens barrel (1) should be greater than 0.02mm, and the gap between the outer side of the colloid (4) and the outer side of the lens barrel (1) should be greater than 0.05mm.

10. A lens structure, characterized in that, The lens includes a lens barrel (1), an end lens (2), and a lens assembly (3). The outer diameter of the upper end of the lens barrel (1) is not greater than the outer diameter of the end lens (2). The end lens (2) includes intersecting snap-fit ​​surfaces and adhesive surfaces. The snap-fit ​​surfaces are snapped to the inner side of the lens barrel (1) by an interference fit. The adhesive surfaces are bonded to the upper end surface of the lens barrel (1) by an adhesive (4). The lens assembly (3) is fixed inside the lens barrel (1). The bonding area S after the glue has cured should be maintained at 7mm. 2 The thickness D of the colloid (4) must be maintained above 0.02 mm; the length L of the interference fit between the lens barrel (1) and the end lens (2) should be maintained at 0.05 mm ≤ L ≤ 0.15 mm; the included angle a between the snap-fit ​​surface and the adhesive surface must be within the range of 90° ≤ a ≤ 135°; after curing, the distance between the inner side of the colloid (4) and the inner side of the lens barrel (1) must be greater than 0.02 mm; and the gap between the outer side of the colloid (4) and the outer side of the lens barrel (1) must be greater than 0.05 mm.

11. A lens structure according to claim 10, characterized in that, The lens group (3) is located below the end lens (2), and the maximum outer diameter of the lens group (3) is smaller than the outer diameter of the end lens (2). The lens group (3) abuts against the outer diameter area of ​​the end lens (2).

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