Miniaturized lens simulation design method and lens structure

Abstract

This invention relates to the field of lens technology, specifically to a miniaturized lens simulation design method and lens structure. The simulation design method includes the following steps: designing a lens structure, which includes a lens barrel and end lenses; linearly fitting tensile strength data obtained from actual experiments to obtain simulation material parameters of the colloid, and establishing a mathematical model of the lens structure; establishing a three-dimensional model of the lens structure based on the mathematical model; importing the three-dimensional model into simulation software; setting the solution conditions for the three-dimensional model and performing simulation. This invention's lens simulation design method performs mechanical simulation on the designed miniaturized lens structure, ensuring that the lens meets the requirements for radial miniaturization while simultaneously verifying the rationality of the overall structure through simulation, thus guaranteeing the lens structure design is qualified.

Description

Technical Field

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

[0002] As the high-end smartphone market deepens, the internal structure of mobile phones becomes increasingly complex, making internal space increasingly precious. On the other hand, users' demands for smaller, lighter phones are becoming more pronounced. The mobile phone camera is a highly attractive selling point, making it crucial to overcome the challenge of making it more refined and minimizing its space occupation. Mobile phone cameras typically appear as a modular unit, and the lens design often determines the spatial distribution of the camera module. With the increasing emphasis on high image quality and multi-lens cameras, the overall length of the camera is a very difficult parameter to compress in terms of optical design. Therefore, conventional camera installation methods often limit the thickness of the phone. This led to the development of the periscope mobile phone camera solution. A periscope mobile phone camera rotates the lens by 90°, using prisms and other methods to reflect light 90° before it enters the camera.

[0003] For periscope lenses, the lateral space is particularly important. A common approach is to chamfer the larger lens elements, reducing the size of the lens barrel accordingly. However, manufacturing lens slicing is extremely difficult, resulting in significant surface shape errors. Furthermore, improper chamfering can damage the entire imaging system. 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 miniaturized lens simulation design method.

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

[0006] Step 1: Design the lens structure, which includes a lens barrel and an end lens. The outer diameter of the upper end of the lens barrel is not greater than the outer diameter of the end lens. A U-shaped adhesive groove is provided on the upper end of the lens barrel. A protrusion that mates with the adhesive groove is provided at the bottom of the end lens. Adhesive is provided between the adhesive groove and the protrusion. The end lens is bonded to the lens barrel by the adhesive. The adhesive groove includes a horizontal section in the middle and two sloping sections at both ends.

[0007] Step 2: Linearly fit the tensile strength data obtained from the actual test to obtain the simulated material parameters of the colloid, establish a mathematical model of the lens structure, and apply a certain thrust F in the axial direction to make the overall lens structure deform in the axial direction in order to analyze the stress on the lens structure at the end lens and lens barrel bonding.

[0008] Step 3: Establish a three-dimensional model of the lens structure based on the mathematical model, and process the three-dimensional model. The effective area of ​​the colloid S = a + b must remain unchanged, where a is the sum of the designed areas of the two slope sections and b is the designed area of ​​the horizontal section. Change the size of a and b.

[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 3D model. Fix the lower end face of the lens tube axially, set the displacement to 0, and leave the other directions free. Apply an axial thrust F to the end lens, keep the effective area S of the colloid constant, and change the sizes of a and b to continue the simulation. The quantitative relationship between a and b when the adhesive force of the end lens meets the requirements can be obtained.

[0011] Furthermore, in step 1, the lens structure also includes a lens group, which 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 top of the lens group is bonded and fixed to the lens barrel.

[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 adhesive, the edge area of ​​the end lens and the lens barrel.

[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, the solution condition is set to ensure that the adhesive force F1 of the end lens is greater than 30N, where F1 = σ*S, σ is the adhesive strength of the colloid, and S is the effective area of ​​the colloid.

[0017] Furthermore, by changing the sizes of a and b to ensure that the adhesive force F1 of the end lens is above 30N, simulations show that the size of a should be maintained at 2.3mm. 2 The size of b should be kept at 7mm. 2 above.

[0018] The present invention also provides a lens structure, including a lens barrel and an end lens. The upper end of the lens barrel is provided with a U-shaped adhesive groove, and the bottom of the end lens is provided with a protrusion that cooperates with the adhesive groove. An adhesive is provided between the adhesive groove and the protrusion. The end lens is bonded to the lens barrel by the adhesive. The adhesive groove includes a horizontal section in the middle and two sloping sections at both ends.

[0019] Furthermore, the sum of the areas of the two slope segments is 2.3 mm. 2 The area of ​​the horizontal segment mentioned above is 7mm. 2 above.

[0020] Furthermore, the protrusion is adapted to the shape of the dispensing groove.

[0021] Furthermore, it also includes a lens assembly, which is disposed below the end lens, and the top of the lens assembly is bonded and fixed to the lens barrel.

[0022] As can be seen from the above description of the present invention, compared with the prior art, the present invention includes at least one of the following beneficial effects:

[0023] 1. The lens simulation design method of the present invention performs mechanical simulation on the designed miniaturized lens structure, so that while the lens meets the requirements of miniaturization in the radial and axial directions, the rationality of the overall structure is verified by simulation, ensuring that the lens structure design is qualified.

[0024] 2. The lens structure designed by the lens simulation design method of the present invention bonds the outermost end lens to the upper end of the lens barrel. The bonding is ensured by the cooperation of the U-shaped glue groove and the protrusion, and the glue will not overflow into the effective diameter of the end lens. Furthermore, the size of the glue structure that meets the adhesive force requirements of the end lens is calculated by mechanical simulation.

[0025] 3. The lens structure of the present invention removes the end portion of the lens barrel that originally enclosed the end lens, reducing the radial dimension of the entire lens by more than 0.8mm, which is very beneficial for miniaturizing the lens in the radial direction. Attached Figure Description

[0026] Figure 1 This is a flowchart illustrating the steps of a miniaturized lens simulation design method in a preferred embodiment of the present invention.

[0027] Figure 2 This is a cross-sectional schematic diagram of the lens structure in a preferred embodiment of the present invention;

[0028] Figure 3 for Figure 2 Enlarged view of point A;

[0029] Figure 4 This is a schematic diagram of the dispensing tank.

[0030] Figure 5 A linear fitting curve of the adhesive area and adhesive strength of the colloid in a preferred embodiment of the present invention;

[0031] Figure 6 A mechanical simulation result diagram of the lens structure in a preferred embodiment of the present invention;

[0032] Figure 7 This is a comparison of stray light analysis results between the present invention and conventional lenses; Figure 7 Figure a shows the stray light analysis results for a standard lens. Figure 7 b is a diagram showing the stray light analysis results of this invention;

[0033] Figure 8 This is a diagram showing the reflected light path 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. Glue; 4. Lens group; 11. Glue groove; 21. Protrusion; 111. Horizontal section; 112. Sloping section. 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 miniaturized lens simulation design method includes the following steps:

[0039] Step 1: Design the lens structure, which includes a lens barrel 1 and an end lens 2. The outer diameter of the upper end of the lens barrel 1 is not greater than the outer diameter of the end lens 2. A U-shaped adhesive groove 11 is provided on the upper end of the lens barrel 1. A protrusion 21 that mates with the adhesive groove 11 is provided at the bottom of the end lens 2. An adhesive 3 is provided between the adhesive groove 11 and the protrusion 21. The end lens 2 is bonded to the lens barrel 1 by the adhesive 3. The adhesive groove 11 includes a horizontal section 111 in the middle and two sloping sections 112 at both ends. (The lens structure is referenced below.) Figures 2-4 As shown;

[0040] Step 2: Linearly fit the tensile strength data obtained from the actual test to obtain the simulated material parameters of colloid 3, establish a mathematical model of the lens structure, and apply a certain thrust F in the axial direction to make the overall lens structure deform in the axial direction in order to analyze the force on the lens structure at the bonding point of the end lens 2 and the lens barrel 1.

[0041] Step 3: Establish a three-dimensional model of the lens structure based on the mathematical model, and process the three-dimensional model. The effective area of ​​colloid 3, S = a + b, must remain unchanged. a is the sum of the designed areas of the two slope segments 112, and b is the designed area of ​​the horizontal segment 111. Change the size of a and b.

[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 end lens 2, keep the effective area S of the colloid 3 unchanged, and continue the simulation by changing the sizes of a and b. The quantitative relationship between a and b when the adhesive force of the end lens 2 meets the requirements can be obtained.

[0044] The lens simulation design method of the present invention performs mechanical simulation on the designed miniaturized lens structure, so that while the lens meets the requirements of radial miniaturization, the rationality of the overall structure is verified by simulation, ensuring that the lens structure design is qualified. The lens structure designed by the lens simulation design method of the present invention has the outermost end lens 2 bonded to the upper end of the lens barrel 1. The U-shaped glue groove 11 and the protrusion 21 cooperate to ensure a firm bond, and the glue will not overflow into the effective diameter of the end lens 2. Furthermore, the size of the adhesive 3 structure that meets the adhesive force requirements of the end lens 2 is 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 structure further includes a lens group 4, which is disposed below the end lens 2. The maximum outer diameter of the lens group 4 is smaller than the outer diameter of the end lens 2, and the top of the lens group 4 is bonded and fixed to the lens barrel 1. The lens structure further includes a lens group 4, which comprises several lenses disposed within the lens barrel 1 and located below the end lens 2. The outer diameter of all lenses in the lens group 4 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. Bonding the end lens 2 to the upper end of the lens barrel 1 ensures that the end lens 2 is not enclosed by the lens barrel 1, and 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, thereby significantly reducing the maximum outer diameter of the lens and satisfying the miniaturization requirement in the radial direction. The top of the lens group 4 is bonded and fixed to the lens barrel 1, eliminating the need for a spacer between the lens group 4 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 3. To ensure the accuracy of the simulation results, the linear fitting curve is referenced... Figure 5 As shown.

[0048] In this embodiment, 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 meshes as the main component. The mesh is further refined for the edge areas of the adhesive 3 and the bonding area between the end lens 2 and the lens barrel 1. Refining the mesh at the edge areas of the bonding area between 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 3 are the simulated material parameters obtained in step 2. The material is a key factor affecting stress, therefore it is set as 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, the solution condition is set so that the adhesive force F1 of the end lens 2 is greater than 30N, where F1 = σ*S, σ is the adhesive strength of the colloid 3, and S is the effective area of ​​the colloid 3. One of the important difficulties in the exposed end lens 2 scheme is whether the connection strength of the exposed lens can be guaranteed, and the main source of strength is the magnitude of the adhesive force. Therefore, based on experimental and simulation analysis, the adhesive force of the end lens 2 is set to be greater than 30N, and this requirement is used as the solution condition.

[0052] Reference Figure 6 As shown, in this embodiment, the sizes of a and b are changed so that the adhesive force F1 of the end lens 2 is greater than 30N. Simulation results show that the size of a should be maintained at 2.3mm. 2 The size of b should be kept at 7mm. 2 The simulation results indicate that for the adhesive force F1 to be above 30N, the value of 'a' should be maintained at 2.3mm. 2 The size of b should be kept at 7mm. 2 The simulation method provides some guidance for the structural design of the lens and verifies the feasibility of the lens structure. For different models of this lens structure, the corresponding parameters can be changed to match and simulate.

[0053] The present invention also provides a lens structure, including a lens barrel 1 and an end lens 2. The upper end of the lens barrel 1 is provided with a U-shaped adhesive groove 11, and the bottom of the end lens 2 is provided with a protrusion 21 that cooperates with the adhesive groove 11. An adhesive 3 is provided between the adhesive groove 11 and the protrusion 21. The end lens 2 is bonded to the lens barrel 1 by the adhesive 3. The adhesive groove 11 includes a horizontal section 111 in the middle and two sloping sections 112 at both ends.

[0054] The lens structure of this invention removes the tail portion of the lens barrel 1 that originally enclosed the end lens 2, reducing the radial dimension of the entire lens by more than 0.8 mm, which is highly beneficial for miniaturizing the lens in the radial direction. Since the tail portion of the lens barrel 1 that originally enclosed the end lens 2 is removed, stray light reflected from the tail portion of the lens barrel 1 can be effectively reduced. (Refer to...) Figure 7 and Figure 8 As shown, in Figure 7 It is evident that the stray light produced by this invention is significantly less than that produced by conventional lenses. Figure 8 The reason why conventional lenses produce more stray light is due to reflections at the rear end of the lens barrel.

[0055] In this embodiment, the sum of the areas of the two ramp segments 112 is 2.3 mm. 2 The area of ​​the horizontal segment 111 is 7mm². 2 The above. Simulation results show that the sum of the areas of the two slope segments 112 is 2.3 mm. 2 The area of ​​horizontal segment 111 is 7mm². 2 The above measures are to ensure that the adhesive strength of the end lens 2 meets the requirements.

[0056] In this embodiment, the protrusion 21 is adapted to the shape of the dispensing groove 11. The surfaces of the protrusion 21 and the dispensing groove 11 should be parallel to ensure the uniformity of the adhesive 3 and more even force distribution.

[0057] In this embodiment, a lens group 4 is also included. The lens group 4 is disposed below the end lens 2, and the top of the lens group 4 is bonded and fixed to the lens barrel 1. By utilizing the U-shaped adhesive groove 11 structure of the lens barrel 1, the end lens 2 can be directly supported on the lens barrel 1, and the top of the lens group 4 can be bonded and fixed to the lens barrel 1. This eliminates the need for the spacer between the lens group 4 and the end lens 2 in conventional lenses, reducing cost expenditure.

[0058] 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 method for miniaturizing lens simulation design, characterized in that, Includes the following steps: Step 1, design the lens structure, which includes a lens barrel (1) and an end lens (2). The outer diameter of the upper end of the lens barrel (1) is not greater than the outer diameter of the end lens (2). A U-shaped glue groove (11) is provided on the upper end of the lens barrel (1). A protrusion (21) that cooperates with the glue groove (11) is provided at the bottom of the end lens (2). Adhesive (3) is provided between the glue groove (11) and the protrusion (21). The end lens (2) is bonded to the lens barrel (1) by the adhesive (3). The glue groove (11) includes a horizontal section (111) in the middle and two sloping sections (112) at both ends. Step 2: Linearly fit the tensile strength data obtained from the actual test to obtain the simulated material parameters of the colloid (3), establish a mathematical model of the lens structure, and apply a certain thrust F in the axial direction to make the overall lens structure deform in the axial direction in order to analyze the force on the lens structure at the bonding point of the end lens (2) and the lens barrel (1). Step 3: Establish a three-dimensional model of the lens structure based on the mathematical model, and process the three-dimensional model. The effective area S=a+b of the colloid (3) should remain unchanged. a is the sum of the designed areas of the two slope segments (112) and b is the designed area of ​​the horizontal segment (111). Change the size of a and b. 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 tube (1) axially, set the displacement to 0, and leave the other directions free. Apply an axial thrust F to the end lens (2), keep the effective area S of the colloid (3) unchanged, change the size of a and b and continue the simulation. The quantitative relationship between a and b when the adhesive force of the end lens (2) meets the requirements can be obtained.

2. The miniaturized lens simulation design method according to claim 1, characterized in that, In step 1, the lens structure also includes a lens group (4), which is located below the end lens (2). The maximum outer diameter of the lens group (4) is smaller than the outer diameter of the end lens (2), and the top of the lens group (4) is bonded and fixed to the lens barrel (1).

3. The miniaturized lens 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 (3).

4. The miniaturized lens 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 adhesive (3), the end lens (2), and the lens barrel (1).

5. The miniaturized lens 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 (3) are the simulation material parameters obtained in step 2.

6. The miniaturized lens 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 miniaturized lens simulation design method according to claim 1, characterized in that, The solution condition is set as follows: the adhesive force F1 of the end lens (2) is greater than 30N, where F1 = σ*S, σ is the adhesive strength of the colloid (3), and S is the area of ​​action of the colloid (3).

8. The miniaturized lens simulation design method according to claim 7, characterized in that, By changing the sizes of a and b, the adhesive force F1 of the end lens (2) is made to be above 30N. Simulation shows that the size of a should be kept at 2.3mm. 2 The size of b should be kept at 7mm. 2 above.

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