Simulation analysis method and simulation analysis device for optical lens

Abstract

The application provides a simulation analysis method and device for an optical lens, wherein the simulation analysis method comprises the following steps: S10, acquiring design parameters, material parameters and parameters of a collision object of the optical lens, and constructing a three-dimensional model of the optical lens and the collision object; S20, setting a collision posture and collision condition of the optical lens to simulate contact between the optical lens and the collision object through vibration, impact or collision, and acquiring a first simulation result; S30, performing structural stability analysis on the optical lens according to the first simulation result, and outputting intermediate data; and S40, acquiring a second simulation result according to the intermediate data, and performing optical performance analysis on the optical lens according to the second simulation result. The application can simulate parameter changes of each component of the optical lens in the whole collision process, evaluate the structural stability and optical performance of the optical lens, and thus know the structural design and optimization direction of the optical lens, shorten the product development cycle and reduce the development cost.

Description

Technical Field

[0001] This invention relates to the field of optical lenses and optical components, and more particularly to a simulation analysis method and a simulation analysis device for optical lenses. Background Technology

[0002] With the continuous development of optical technology, the application range of optical lenses is constantly expanding, which puts forward higher requirements for the imaging quality and performance of optical lenses. At the same time, the internal structure of optical lenses is becoming more and more complex. As the core component of optical imaging systems, changes in the structure of optical lenses will directly affect the imaging quality of optical systems. Therefore, the requirements for the structure and performance of manufactured optical lenses are becoming more and more stringent.

[0003] Precision optical components such as lenses are susceptible to drops and collisions during use and transportation. If the structural design is flawed, drop impacts can alter the lens structure, affecting image quality. Traditional drop tests are typically used to assess product reliability in such cases. However, traditional drop tests for optical lenses suffer from short drop times, difficulty in controlling the drop attitude, and poor repeatability. Furthermore, traditional drop tests require a pre-prepared optical lens sample, and since an optical lens comprises a barrel, lenses, gaskets, and light-blocking paper, the entire component manufacturing process is lengthy. A flawed final design can waste significant manpower, resources, and time. Moreover, traditional drop tests only assess whether the optical lens meets industry standards; they cannot fully reflect the deformation of individual components during a drop, nor can they directly demonstrate changes in lens optical performance from data. This offers little help in improving product structure and hinders product development efficiency.

[0004] The content of the background section only discloses the technology known to the inventors and does not necessarily represent the prior art in this field. Summary of the Invention

[0005] In view of one or more existing defects, the present invention relates to a simulation analysis method for optical lenses, comprising:

[0006] S10: Obtain the design parameters, material parameters of the optical lens, and parameters of the impactor, and construct a three-dimensional model of the optical lens and the impactor;

[0007] S20: Set the impact posture and impact conditions of the optical lens to simulate the contact between the optical lens and the impacting object through vibration, impact or collision, and obtain the first simulation result;

[0008] S30: Perform structural stability analysis on the optical lens based on the first simulation results, and output intermediate data;

[0009] S40: Obtain the second simulation result based on the intermediate data, and perform optical performance analysis on the optical lens based on the second simulation result.

[0010] According to one aspect of the invention, step S10 further includes: geometrically cleaning the three-dimensional model of the optical lens.

[0011] According to one aspect of the present invention, step S20 includes: dividing the three-dimensional model of the optical lens into a mesh to obtain a mesh model; performing impact simulation calculations on the mesh model based on the design parameters, material parameters, impact attitude, impact conditions, and parameters of the impacting object of the optical lens; and obtaining a first simulation result.

[0012] According to one aspect of the present invention, the optical lens includes at least one lens element, a lens barrel, and at least one spacer. Step S30 includes: analyzing the stress distribution and strain distribution of the optical lens as a whole and its components under different impact postures based on the first simulation results, so as to determine whether the structural stability of the optical lens meets the design requirements.

[0013] According to one aspect of the present invention, step S30 includes: obtaining the maximum stress value and maximum strain value of each component of the optical lens under different impact postures based on the first simulation results, and comparing them with a set threshold to determine whether the stress on each component of the optical lens meets the design requirements.

[0014] According to one aspect of the present invention, step S30 includes: obtaining the displacement changes of each component, the axial changes of the lens surface shape, and the changes in the gap between the lenses based on the first simulation results, so as to calculate one or more of the radius of curvature, center thickness, optical surface spacing, quadratic surface coefficient, and aspherical surface shape coefficient of each lens in the optical lens under different impact postures, and outputting the calculation results as intermediate data.

[0015] According to one aspect of the invention, the axial change of the lens surface shape is the difference between the maximum and minimum values ​​in the deformation result.

[0016] According to one aspect of the present invention, step S40 further includes: obtaining the change in optical performance of the optical lens under different impact postures based on the intermediate data, and comparing it with a set threshold to determine whether the optical performance of the optical lens meets the design requirements.

[0017] According to one aspect of the present invention, the simulation analysis method further includes:

[0018] S50: Based on the first simulation result and / or the second simulation result, adjust the design parameters of the optical lens, and repeat steps S10-S40 until the structural stability and optical performance of the optical lens meet the design requirements.

[0019] This invention also relates to a simulation analysis device for optical lenses, comprising:

[0020] The preprocessing module is configured to acquire the design parameters, material parameters, and impactor parameters of the optical lens, and to construct a three-dimensional model of the optical lens and the impactor.

[0021] The first simulation module is configured to simulate the optical lens coming into contact with the impacting object through vibration, impact or collision according to the impact posture and impact conditions of the optical lens, and obtain the first simulation result; it is also configured to perform structural stability analysis on the optical lens according to the first simulation result and output intermediate data.

[0022] The second simulation module is configured to obtain a second simulation result based on the intermediate data, and to perform optical performance analysis on the optical lens based on the second simulation result.

[0023] According to one aspect of the invention, the preprocessing module is further configured to perform geometric cleanup on the three-dimensional model of the optical lens.

[0024] According to one aspect of the present invention, the first simulation module is further configured to: perform mesh generation on the three-dimensional model of the optical lens to obtain a mesh model, and perform impact simulation calculations on the mesh model according to the design parameters, material parameters, impact attitude, impact conditions and parameters of the impacting object of the optical lens, to obtain a first simulation result.

[0025] According to one aspect of the present invention, the optical lens includes at least one lens element, a lens barrel, and at least one spacer. The first simulation module is further configured to: analyze the stress distribution and strain distribution of the optical lens as a whole and its components under different impact postures based on the first simulation results, so as to determine whether the structural stability of the optical lens meets the design requirements.

[0026] According to one aspect of the present invention, the first simulation module is configured to: obtain the maximum stress value and maximum strain value of each component of the optical lens under different impact postures based on the first simulation results, and compare them with a set threshold to determine whether the stress on each component of the optical lens meets the design requirements.

[0027] According to one aspect of the present invention, the first simulation module is configured to: obtain the displacement changes of each component, the axial changes of the lens surface shape, and the changes in the gap between the lenses based on the first simulation results, so as to calculate one or more of the radius of curvature, center thickness, optical surface spacing, quadratic surface coefficient, and aspherical surface shape coefficient of each lens in the optical lens under different impact postures, and output the calculation results as intermediate data.

[0028] According to one aspect of the present invention, the second simulation module is further configured to: obtain the change in optical performance of the optical lens under different impact postures based on the intermediate data, and compare it with a set threshold to determine whether the optical performance of the optical lens meets the design requirements.

[0029] In summary, this invention can not only simulate the parameter changes of each component of an optical lens during the entire impact process, but also analyze the stability of the lens structure based on the simulation results, and evaluate the changes in the optical performance of the lens. This can guide the structural design and optimization of optical lenses, improve product development efficiency, shorten the lens development cycle, reduce development costs, and enhance the competitiveness of products entering the market. Attached Figure Description

[0030] The accompanying drawings, which form part of this disclosure, are used to provide a further understanding of this disclosure. The illustrative embodiments of this disclosure and their descriptions are used to explain this disclosure and do not constitute an undue limitation of this disclosure. In the drawings:

[0031] Figure 1 shows a flowchart of a simulation analysis method for an optical lens according to an embodiment of the present invention;

[0032] Figure 2 A schematic diagram of an optical lens structure according to an embodiment of the present invention is shown;

[0033] Figure 3 A schematic diagram illustrating the drop posture of an optical lens according to an embodiment of the present invention is shown;

[0034] Figure 4 This diagram illustrates the stress distribution cloud map of the cross-section when the lower end face of the optical lens of an embodiment of the present invention touches the ground.

[0035] Figure 5a It shows Figure 4 Stress curves of various components over time;

[0036] Figure 5b It shows Figure 4 Strain curves of each component over time;

[0037] Figure 6 This diagram illustrates the stress distribution cloud map of the cross-section when the upper surface of the optical lens of an embodiment of the present invention touches the ground.

[0038] Figure 7a It shows Figure 6 Stress curves of various components over time;

[0039] Figure 7b It shows Figure 6 Strain curves of each component over time;

[0040] Figure 8a A schematic diagram illustrating the axial variation of the lens surface shape according to an embodiment of the present invention is shown;

[0041] Figure 8b It shows Figure 8a A schematic diagram showing the results of changes in lens surface shape;

[0042] Figure 9 A schematic diagram of a simulation analysis device for an optical lens according to an embodiment of the present invention is shown. Detailed Implementation

[0043] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0044] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and 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, and therefore should not be construed as a limitation of 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 or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0045] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0046] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0047] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0048] The purpose of this invention is to provide an optical lens simulation analysis method and simulation analysis device for evaluating the changes in the structure and optical performance of each component in an optical lens during an impact, thereby determining the structural design and optimization direction of the optical lens, improving product development efficiency, and shortening the development cycle.

[0049] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0050] Figure 1 illustrates a simulation analysis method for an optical lens according to an embodiment of the present invention, including steps S10-S40, as follows:

[0051] In step S10: Obtain the design parameters, material parameters, and impact parameters of the optical lens, and construct a three-dimensional model of the optical lens and the impact object.

[0052] To simulate the impact process of an optical lens, a three-dimensional model of the optical lens and the impacting object needs to be constructed. Impact refers to vibration, shock, and collision. Vibration testing simulates the various vibration environments a product encounters during transportation, installation, and use to assess the resistance of components, parts, and the entire machine in the expected transportation and use environments. Vibration refers to the reciprocating motion of a product relative to its equilibrium position. Traditional impact testing is an experimental method for assessing the safety, reliability, and effectiveness of a product when subjected to external impact or action. Impact is a sudden and violent release of energy; the impact environment typically refers to infrequent and non-repetitive impact forces encountered during the impact process. This type of impact force generates a large acceleration and has a short impact pulse duration, such as a drop. When simulating a drop process, the impacting object can be the ground. Collision testing is used to assess the impact resistance of transport packaging to withstand multiple repetitive mechanical impacts during transportation and the packaging's ability to protect its contents. Collision refers to a series of repetitive forces acting on a single target. It is characterized by a high frequency, repeatability, low acceleration, and long pulse duration. An example is the impact between an optical lens and packaging or a vehicle. In simulating this process, the impacting object is the packaging or vehicle. The type of impacting object is selected based on the required collision (vibration, impact, or collision) process, and then a three-dimensional model is constructed based on the object's parameters. For ease of description, the following section uses the impact process of an optical lens falling to the ground as an example to introduce the simulation analysis method.

[0053] An optical lens comprises multiple components, such as lens elements, spacers / gaskets, light-blocking paper, and the lens barrel. A three-dimensional model of the optical lens is constructed based on the design and material parameters of each component. If the impact object is the ground, a three-dimensional model of the ground is constructed based on its material parameters. The design parameters for each lens element include, for example, radius of curvature, center thickness, optical surface spacing, quadratic coefficient, and aspherical surface coefficient; the material parameters include, for example, density, Poisson's ratio, elastic modulus, tensile strength, and elongation at break.

[0054] Figure 2 A schematic diagram of an optical lens structure according to an embodiment of the present invention is shown, wherein the optical lens includes a lens barrel, a first lens P1, a second lens P2, a third lens P3, a fourth lens P4, a light-blocking paper (not shown), and a spacer. The material parameters of each component and the material parameters of the ground are shown in Table 1.

[0055]

[0056]

[0057] Table 1

[0058] Based on the material parameters in Table 1 and the design parameters of each component, construct a three-dimensional model of the optical lens and the ground.

[0059] According to a preferred embodiment of the present invention, step S10 further includes: geometric cleanup of the three-dimensional model of the optical lens.

[0060] Geometric cleanup is performed on the established 3D model of the optical lens, removing or adjusting small features without affecting the overall structural performance of the 3D model. For example, unnecessary chamfers, rounded corners, and steps in the lens barrel that do not affect the overall structural strength are removed. However, because the lens size is very small, even minor local features have a significant impact on optical performance; therefore, rounded corners and other features of the lens are retained. Geometric cleanup of the 3D model ensures better simulation analysis results and improves computational accuracy and efficiency.

[0061] In step S20: Set the impact posture and impact conditions of the optical lens to simulate the optical lens coming into contact with the impacting object through vibration, impact or collision, and obtain the first simulation result.

[0062] The simulation analysis process for lens drop can be divided into three stages: preprocessing, solution, and post-processing. Preprocessing further includes: constructing a 3D model, defining material properties, and building a finite element system. In step S10, 3D models of the optical lens and the impactor were constructed, and material properties were determined. The following section describes the construction of the finite element system, the solution settings, and the post-processing.

[0063] According to a preferred embodiment of the present invention, step S20 includes: dividing the three-dimensional model of the optical lens into a mesh to obtain a mesh model; performing impact simulation calculations on the mesh model based on the design parameters, material parameters, impact attitude, impact conditions, and parameters of the impacting object of the optical lens; and obtaining a first simulation result.

[0064] Taking the simulated drop of an optical lens as an example, continue to refer to Figure 2To construct the finite element system, the drop posture model was first imported into the system, and material properties were defined and assigned (e.g., material properties for the optical lens and ground were assigned according to the material parameters in Table 1). Then, the 3D models of the optical lens and ground were meshed. To ensure computational accuracy while reducing computational load, hexahedral elements were used for the mesh. For example, the element size for each component in the optical lens was set to 0.12 mm, and the element size for the ground was set to 0.25 mm. The initial contact automatically generated by the finite element system was deleted. Because the drop of the optical lens is complex, it is difficult to predict the contact situation between components during the drop, and the initial contact area between components is small. Therefore, the system automatically uses single-sided contact. In single-sided contact, the program can automatically determine the location of surface contact in the product. The definition process is simple, requiring no definition of the contact surface and target surface. It allows all outer surfaces of the entire product model to potentially contact, making it suitable for self-contact or large deformation problems where the contact surface is unknown beforehand. The P4 lens closest to the image side was set to bonded contact with the lens barrel to simulate glue bonding during actual assembly. All component types were set to frictional contact, with a friction coefficient set to, for example, 0.25.

[0065] After assigning material properties and meshing, the solution conditions for the drop simulation are set. In the 3D model, different drop attitudes can be set by rotating the contact angle between the optical lens and the ground. The choice of drop attitude is related to the shape of the optical lens. For example, if the optical lens is cube-shaped, each face or corner can be selected; if the optical lens is cylindrical, the top face (top surface, closest to the image side), bottom face (bottom surface, closest to the object side), sidewalls, and multiple contact angles can be selected. Figure 3 This diagram illustrates the drop posture of an optical lens according to an embodiment of the present invention, in conjunction with... Figure 2 Figure (a) shows the upper surface of the optical lens landing on the ground, (b) shows the lower surface of the optical lens landing on the ground, (c) shows the side wall of the optical lens landing on the ground, and (d) shows the contact angle between the optical lens and the ground at 30°. The drop conditions are, for example, a height of 1 meter, three drops per drop posture, and a granite surface. Based on the above analysis, the drop postures and conditions of the optical lens are set to simulate the optical lens falling to the ground, and the first simulation results are obtained.

[0066] Two typical fall attitudes are selected for setting the solution conditions, such as... Figure 3 In image (a), the upper surface of the lens touches the ground and... Figure 3 In Figure (b), the lower end of the lens touches the ground. The solution conditions include analysis conditions, load conditions, and constraint conditions, which are set up as follows:

[0067] Set the analysis conditions: (1) Set the initial velocity. To improve the efficiency of the calculation, the free fall process of the lens is ignored during the calculation. The relationship between velocity v, gravitational acceleration g, and displacement h is used. (2) Set the termination time. Since the impact time of the drop is very short and is completed in an instant, based on the experience of multiple drop analyses of the lens, the termination time is set to 0.0001s for example.

[0068] Load conditions are set: During the lens drop impact analysis, only gravitational acceleration is applied, with no other loads present. Based on the drop direction in the solid model, a gravitational acceleration is set in the same direction, with a value for example, 9806 mm / s². 2 .

[0069] Set constraints: During drop analysis, set Fixed Support for the simulated ground.

[0070] The above examples of the optical lens drop process illustrate the preprocessing (building a 3D model, defining material properties, and building a finite element system) and solution (setting analysis conditions, load conditions, and constraint conditions) in the simulation analysis method. The following section further introduces the postprocessing in the simulation analysis method.

[0071] In step S30: Perform structural stability analysis on the optical lens based on the first simulation results and output intermediate data.

[0072] The post-processing of the simulation analysis method involves performing structural stability analysis on the optical lens. The analysis items include displacement deformation results, stress-strain cloud diagrams, and custom deformation results.

[0073] Analysis of displacement deformation results: (1) Total displacement deformation of the optical lens: Observe the lens drop animation and check the changes of each component during the lens drop; (2) Displacement deformation of each component along the X, Y, and Z directions. Continue to refer to Figure 2Select P1, P2, P3, P4, lens barrel, and spacer in sequence to check the deformation of each lens component along the X, Y, and Z directions during the drop; (3) Displacement and deformation of aspherical / spherical lenses along the axial direction. For example, if aspherical lenses are used in all optical lenses, add the aspherical deformation cloud map of lens R1 first: select lens R1 aspherical P1, select the axial Z direction, repeat this process, select P2, P3, and P4 in sequence to obtain the aspherical deformation cloud map of 4 lenses after the drop; then add the aspherical deformation cloud map of lens R2: select lens R2 aspherical P1, select the axial Z direction, repeat this process, select P2, P3, and P4 in sequence to obtain the aspherical deformation cloud map of 4 lenses after the drop. Analyze the displacement and deformation of each lens aspherical along the axial direction based on the aspherical deformation cloud map of each lens R1 and the aspherical deformation cloud map of each lens. If the optical lens contains spherical lenses, spherical deformation cloud maps R1 and R2 can be added to analyze the displacement and deformation of each lens spherical surface along the axial direction.

[0074] According to a preferred embodiment of the present invention, the optical lens includes at least one lens element, a lens barrel, and at least one spacer. Step S30 includes: analyzing the stress distribution and strain distribution of the optical lens as a whole and its components under different impact postures based on the first simulation results, so as to determine whether the structural stability of the optical lens meets the design requirements.

[0075] Analyze stress-strain cloud diagrams: (1) Analyze the overall stress and strain distribution cloud diagram of the optical lens: For example, watch the drop animation and check the stress and strain changes of each component during the lens drop to determine whether the overall design requirements of the optical lens are met; (2) Analyze the stress and strain distribution cloud diagrams of each component separately to determine whether the design requirements of each component are met. For example, analyze the stress and strain cloud diagram of the lens barrel to check the stress and strain distribution during the lens barrel drop; analyze the stress and strain cloud diagram of the lens to check the stress and strain distribution during the lens drop.

[0076] According to a preferred embodiment of the present invention, step S30 includes: obtaining the maximum stress value and maximum strain value of each component of the optical lens under different impact postures based on the first simulation results, and comparing them with a set threshold to determine whether the stress on each component of the optical lens meets the design requirements.

[0077] As analyzed above, when determining whether the overall lens design requirements or the design requirements of individual components are met based on the stress and strain distribution cloud maps of the optical lens as a whole or its components, threshold values ​​can be preset. When the stress or strain value exceeds the threshold, the design requirements are not met. For example, a stress threshold can be set based on the material's fracture strength; if the maximum stress value of a component exceeds the material's fracture strength, the design requirements are not met. Similarly, a strain threshold can be set based on the material's elongation at break; if the maximum strain value of a component exceeds the material's elongation at break, the design requirements are not met. Otherwise, if each component meets the design requirements, the lens's structural stability is good.

[0078] Continuing with the example of an optical lens falling to the ground, simulation analysis was performed using finite element analysis software to obtain the stress and strain distribution of each component of the lens under two typical drop postures. Based on the obtained stress and strain data of each component, stress and strain curves were plotted, and the fracture strength and elongation at break of each component material were compared to determine the structural stability of each component of the lens during the drop impact.

[0079] Figure 4 This diagram illustrates the stress distribution contour plot of the cross-section when the lower end face of the optical lens of an embodiment of the present invention touches the ground. Figure 5a It shows Figure 4 The stress curves of each component over time show that the lens is subjected to relatively uniform stress overall. The maximum stress value occurs on the gasket, specifically 152.96 MPa, which is less than the breaking strength of the gasket material (300 MPa) (refer to Table 1), meeting the design requirements. The maximum stress value of the first lens P1 is 25.38 MPa, which is less than the breaking strength of P1 (60 MPa), meeting the design requirements. The maximum stress value of the second lens P2 is 26.84 MPa, which is less than the breaking strength of P2 (60 MPa), meeting the design requirements. The maximum stress value of the third lens P3 is 19.98 MPa, which is less than the breaking strength of P3 (60 MPa), meeting the design requirements. The maximum stress value of the fourth lens P4 is 17.64 MPa, which is less than the breaking strength of P4 (65 MPa), meeting the design requirements. The maximum stress value of the lens barrel is 22.63 MPa, which is less than the breaking strength of the lens barrel (62 MPa), meeting the design requirements.

[0080] Figure 5b It shows Figure 4The strain curves of each component over time show that the maximum strain values ​​occur in the lens barrel and the third lens P3. Specifically, the maximum strain value of the first lens P1 is 0.91%, which is less than the elongation at break of P1 (3%), meeting the design requirements; the maximum strain value of the second lens P2 is 0.86%, which is less than the elongation at break of P2 (7%), meeting the design requirements; the maximum strain value of the third lens P3 is 1.19%, which is less than the elongation at break of P3 (3%), meeting the design requirements; the maximum strain value of the fourth lens P4 is 0.69%, which is less than the elongation at break of P4 (9%), meeting the design requirements; and the maximum strain value of the lens barrel is 1.18%, which is less than the elongation at break of the lens barrel (6%), meeting the design requirements.

[0081] Based on the above analysis, when the lower end face of the optical lens touches the ground, the maximum stress and maximum strain values ​​of each component are less than the threshold, indicating that after the lower end face of the lens touches the ground, each component meets the design requirements and the structure has good stability.

[0082] Figure 6 The figure shows a stress distribution cloud diagram of the cross section when the upper surface of the optical lens of an embodiment of the present invention touches the ground. As can be seen from the figure, the stress on the lens as a whole is concentrated on the third lens P3, the fourth lens P4 and the end of the lens barrel near the image side. Figure 7a It shows Figure 6 The stress curves of each component over time show that the maximum stress value occurs on the gasket, which is approximately 120 MPa, lower than the gasket's breaking strength of 300 MPa, thus meeting the design requirements. The maximum stress values ​​of each lens and lens barrel do not exceed 40 MPa, also meeting the design requirements. Figure 7b It shows Figure 6 The strain curves of each component over time show that the maximum strain value occurs on the lens barrel, which is about 1.8%, lower than the elongation at break of the lens barrel (6%), thus meeting the design requirements. The maximum strain values ​​of each lens and gasket do not exceed 0.8%, which also meets the design requirements.

[0083] Based on the above analysis, when the upper surface of the optical lens touches the ground, the maximum stress and maximum strain values ​​of each component are less than the threshold, and each component meets the design requirements, indicating good structural stability.

[0084] The above examples analyze the stress and strain of various components of the optical lens under two drop postures. Custom analysis parameters can also be defined, which will be further explained below.

[0085] Analyze the custom deformation results: (1) Analyze the lens thickness change. For example, select the R1 aspherical / spherical center node and R2 aspherical / spherical center node of lens P1, create a thickness path for lens P1, insert an axial deformation cloud map, select the set lens thickness path, and finally obtain a thickness change cloud map of lens P1. Analyze whether the design requirements are met based on the thickness change cloud maps of each lens; (2) Analyze the lens gap change. For example, select the R2 aspherical / spherical center node of lens P1 and the R1 aspherical / spherical center node of lens P2, create a gap path between lenses P1 and P2, insert an axial deformation cloud map, select the set gap path, and finally obtain a gap change cloud map of lenses P1 and P2. Analyze whether the design requirements are met based on the gap change cloud maps of each lens. Preferably, compare the thickness change and gap change of each lens with the set threshold to determine whether the design requirements are met.

[0086] The above analysis of the structural stability of the optical lens during the drop process is based on the displacement deformation results, stress-strain cloud map, and custom deformation results from the first simulation. This invention does not limit the form or content of the first simulation results; anything that can analyze the structural stability of the lens falls within the scope of this invention. In addition to the structural stability analysis based on the first simulation results, intermediate data for optical performance analysis will also be output, which will be further described below.

[0087] According to a preferred embodiment of the present invention, step S30 includes: obtaining the displacement changes of each component, the axial changes of the lens surface shape, and the changes in the gap between the lenses based on the first simulation results, so as to calculate one or more of the radius of curvature, center thickness, optical surface spacing, quadratic surface coefficient, and aspherical surface shape coefficient of each lens in the optical lens under different impact postures, and outputting the calculation results as intermediate data.

[0088] Continuing with the example of an optical lens drop, the axial deformation of the aspherical surfaces of each lens under two drop postures is obtained based on the first simulation results. For example, the actual deformation and rigid displacement (rigid displacement is the displacement that occurs without a change in the object's shape) of each lens are obtained based on the displacement changes of each component, the axial changes in the lens surface shape, and the changes in the gaps between lenses. The axial change PV value of each lens surface shape is then calculated. Based on the PV value of each lens, the surface shape parameters of the deformed lens can be further calculated, such as the radius of curvature, quadratic surface coefficient, and aspherical surface shape coefficient. If it is a spherical lens, the radius of curvature of the deformed lens is obtained. The center thickness and optical surface spacing of each lens are calculated based on the displacement changes of each component and the changes in the gaps between lenses. One or more of the above calculation results are output as intermediate data.

[0089] According to a preferred embodiment of the present invention, the axial change of the lens surface shape is the difference between the maximum and minimum values ​​in the deformation result.

[0090] Figure 8a This diagram illustrates the axial change of a lens surface shape according to an embodiment of the present invention. The top curve represents the lens model before deformation, i.e., the lens model in the constructed 3D model; the middle curve represents the lens model after deformation under force. If the surface shape is mapped to 3D coordinates, both the pre- and post-deformation models contain maximum and minimum values ​​(because deformation is non-uniform; for example, on an aspherical surface, some locations deform significantly while others deform less); the bottom curve represents the rigid displacement of the lens. To ensure the accuracy of the lens optical performance analysis, the PV value of each lens needs to be accurately calculated. The PV value is the axial change of the surface shape and does not include the rigid displacement of the lens. Therefore, removing the rigid displacement from the deformation result and retaining the actual deformation can reduce calculation errors. By superimposing the initial 3D model onto the deformed model, the rigid displacement in the deformation result can be eliminated, obtaining the required PV value.

[0091] Figure 8b It shows Figure 8a The diagram illustrates the changes in lens surface shape. Taking the first lens, P1 R1 aspherical, as an example, the maximum deformation (Max) is 0.0072587 mm, and the minimum deformation (Min) is 0.0068757 mm. Using the formula PV = Max - Min, the value of PV is 0.000383 mm. Based on the PV values ​​of each lens, the surface shape parameters such as the radius of curvature, center thickness, optical surface spacing, quadratic surface coefficient, and aspherical surface shape coefficient of each lens after deformation can be further calculated. These parameters serve as intermediate data output for subsequent optical stability analysis.

[0092] In step S40: Obtain the second simulation result based on the intermediate data, and perform optical performance analysis on the optical lens based on the second simulation result.

[0093] Error analysis is performed based on the surface parameters of each lens after deformation, such as radius of curvature, center thickness, optical surface spacing, quadratic surface coefficient, and aspherical surface coefficient. The results are compared with the design parameters or optical design specifications before deformation to evaluate the optical performance of the lens after a drop.

[0094] According to a preferred embodiment of the present invention, step S40 further includes: obtaining the change in optical performance of the optical lens under different impact postures based on intermediate data, and comparing it with a set threshold to determine whether the optical performance of the optical lens meets the design requirements.

[0095] Continuing with the example of an optical lens being dropped, since parameters such as the refractive index and Abbe number of the lens remain unchanged before and after the drop, we only need to consider parameters that may change after lens deformation, such as radius of curvature, center thickness, optical surface spacing, quadratic coefficient, and aspherical coefficients A4 and A8. Based on error analysis, we obtain the performance indicators of the deformed optical lens, such as field curvature change, peak MTF change, and specific MTF value change. Table 2 shows the changes in optical performance when the lower end of the lens hits the ground, and Table 3 shows the changes in optical performance when the upper end of the lens hits the ground. These changes can provide direction for optical design optimization.

[0096]

[0097] Table 2

[0098]

[0099] Table 3

[0100] According to a preferred embodiment of the present invention, reference is made to Figure 1b Simulation analysis methods also include:

[0101] In step S50: Based on the first simulation result and / or the second simulation result, adjust the design parameters of the optical lens, and repeat steps S10-S40 until the structural stability and optical performance of the optical lens meet the design requirements.

[0102] and Figure 1a The first four steps of the embodiment are the same, that is, a three-dimensional model is constructed in step S10, the first simulation result is obtained in step S20, the structural stability of each component of the optical lens is analyzed in step S30, and optical performance analysis is performed in step S40. Figure 1a The difference in this embodiment lies in that, in step S50, the design parameters of the optical lens are adjusted based on the structural stability analysis results and / or the changes in optical performance. For example, the changes in optical performance of the optical lens under various drop postures are compared with a set threshold. If the changes exceed the set threshold, the optical design parameters can be optimized and adjusted, and then the impact simulation is performed again. The simulated optical performance is then evaluated and analyzed until the performance meets the standard. Preferably, if the structural stability analysis results do not meet the threshold, the design parameters can be adjusted and a second simulation can be performed. The optical performance of the optical lens is then analyzed based on the results of the second simulation.

[0103] In summary, the simulation analysis method for optical lenses provided in this invention simulates the lens under multiple impact postures, analyzes the stability of the lens structure using the simulation results, and outputs the optical parameters after the impact based on the simulation results. This allows for the evaluation of changes in the lens's optical performance, and corresponding optimizations to the optical structure design based on the analysis results. This invention not only provides simulation results of lens impacts but also analyzes the stability of the lens structure based on the impact results and evaluates changes in the lens's optical performance. This guides the structural design and optical performance optimization of optical lenses, improves lens development efficiency, shortens the development cycle, reduces development costs, and enhances the product's competitiveness in the market.

[0104] This specification provides the operational steps of the methods described in the embodiments or flowcharts, but based on conventional or non-inventive labor, more or fewer operational steps may be included. The order of steps listed in the embodiments is merely one possible execution order among many and does not represent the only possible execution order. In actual system or device products, the methods shown in the embodiments or flowcharts can be executed sequentially or in parallel.

[0105] This invention also relates to a simulation analysis device for optical lenses, such as... Figure 9 As shown, it includes:

[0106] The preprocessing module 101 is configured to acquire the design parameters, material parameters and impact parameters of the optical lens, and construct a three-dimensional model of the optical lens and the impact object;

[0107] The first simulation module 102 is configured to simulate the optical lens contacting the impacting object through vibration, impact or collision according to the impact posture and impact conditions of the optical lens, and obtain a first simulation result; it is also configured to perform structural stability analysis on the optical lens according to the first simulation result and output intermediate data.

[0108] The second simulation module 103 is configured to obtain a second simulation result based on the intermediate data, and to perform optical performance analysis on the optical lens based on the second simulation result.

[0109] According to a preferred embodiment of the present invention, the preprocessing module 101 is further configured to perform geometric cleanup on the three-dimensional model of the optical lens.

[0110] According to a preferred embodiment of the present invention, the first simulation module 102 is further configured to: perform mesh generation on the three-dimensional model of the optical lens to obtain a mesh model, and perform impact simulation calculation on the mesh model according to the design parameters, material parameters, impact attitude, impact conditions and parameters of the impacting object of the optical lens to obtain a first simulation result.

[0111] According to a preferred embodiment of the present invention, the optical lens includes at least one lens element, a lens barrel, and at least one spacer. The first simulation module 102 is further configured to: analyze the stress distribution and strain distribution of the optical lens as a whole and its components under different impact postures based on the first simulation results, so as to determine whether the structural stability of the optical lens meets the design requirements.

[0112] According to a preferred embodiment of the present invention, the first simulation module 102 is configured to: obtain the maximum stress value and maximum strain value of each component of the optical lens under different impact postures based on the first simulation results, and compare them with a set threshold to determine whether the stress on each component of the optical lens meets the design requirements.

[0113] According to a preferred embodiment of the present invention, the first simulation module 102 is configured to: obtain the displacement changes of each component, the axial changes of the lens surface shape, and the changes in the gap between the lenses based on the first simulation results, so as to calculate one or more of the radius of curvature, center thickness, optical surface spacing, quadratic surface coefficient, and aspherical surface shape coefficient of each lens in the optical lens under different impact postures, and output the calculation results as intermediate data.

[0114] According to a preferred embodiment of the present invention, the second simulation module 103 is further configured to: obtain the change in optical performance of the optical lens under different impact postures based on the intermediate data, and compare it with a set threshold to determine whether the optical performance of the optical lens meets the design requirements.

[0115] This invention can simulate the parameter changes of each component of an optical lens during the entire impact process, in order to evaluate the structural stability and optical performance of the optical lens, thereby identifying the structural design and optimization direction of the optical lens, shortening the product development cycle, and reducing R&D costs.

[0116] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An optical lens simulation analysis method, comprising: S10: obtaining design parameters, material parameters of an optical lens, and parameters of an impact object, and constructing a three-dimensional model of the optical lens and the impact object; S20: setting an impact posture and impact condition of the optical lens to simulate contact of the optical lens with the impact object through vibration, impact or collision, and obtaining a first simulation result; S30: performing structural stability analysis on the optical lens according to the first simulation result, and outputting intermediate data; S40: obtaining a second simulation result according to the intermediate data, and performing optical performance analysis on the optical lens according to the second simulation result; wherein the intermediate data comprises face shape parameters of deformed lenses, axial change PV values of each lens face shape are calculated, the PV value is a difference between a maximum value and a minimum value in a deformation result of the lens face shape, and face shape parameters of the deformed lenses are further calculated according to the PV values of each lens; the optical lens comprises at least one lens, a lens barrel and at least one spacer ring; the step S30 comprises: obtaining a displacement change of each component, an axial change of a lens face shape and a gap change between lenses according to the first simulation result, to calculate one or more of a curvature radius, a center thickness, an optical surface spacing, a quadratic surface coefficient and an aspheric face shape coefficient of each lens in the optical lens under different impact postures, and output the calculation result as intermediate data; according to the first simulation result, stress distribution and strain distribution of the optical lens as a whole and each component under different impact postures are analyzed to determine whether the structural stability of the optical lens meets the design requirements; according to the first simulation result, maximum stress values and maximum strain values of each component of the optical lens under different impact postures are obtained, and compared with a set threshold value to determine whether the stress of each component of the optical lens meets the design requirements; the step S40 further comprises: according to the intermediate data, obtaining an optical performance change amount of the optical lens under different impact postures, and comparing the optical performance change amount with a set threshold value to determine whether the optical performance of the optical lens meets the design requirements.

2. The simulation analysis method according to claim 1, wherein the step S10 further comprises: geometric cleaning is performed on the three-dimensional model of the optical lens.

3. The simulation analysis method according to claim 1, wherein the step S20 comprises: a grid model is obtained by meshing the three-dimensional model of the optical lens, and impact simulation calculation is performed on the grid model according to the design parameters, material parameters, impact posture, impact condition of the optical lens and the parameters of the impact object, to obtain the first simulation result.

4. The simulation analysis method according to any one of claims 1-3, further comprising: S50: adjusting the design parameters of the optical lens according to the first simulation result and / or the second simulation result, and repeating steps S10-S40 until the structural stability and the optical performance of the optical lens both meet the design requirements.

5. An optical lens simulation analysis device, comprising: a pre-processing module configured to obtain design parameters, material parameters of an optical lens, and parameters of an impact object, and construct a three-dimensional model of the optical lens and the impact object; The first simulation module is configured to simulate the optical lens contacting the impact object through vibration, impact or collision according to the impact attitude and impact condition of the optical lens, and obtain a first simulation result; The first simulation module is further configured to perform structural stability analysis on the optical lens according to the first simulation result and output intermediate data; The second simulation module is configured to obtain a second simulation result according to the intermediate data, and perform optical performance analysis on the optical lens according to the second simulation result. The intermediate data includes face shape parameters of the deformed lens, axial change PV values of each lens face shape are calculated, the PV value is the difference between the maximum and minimum values in the deformation result of the lens face shape, and the face shape parameters of the deformed lens are further calculated according to the PV values of each lens; the optical lens includes at least one lens, a lens barrel and at least one spacer ring; The first simulation module is configured to obtain the displacement change of each component, the axial change of the lens face shape and the gap change between the lenses, so as to calculate one or more of the curvature radius, the center thickness, the optical surface distance, the quadratic surface coefficient and the aspheric face shape coefficient of each lens in the optical lens under different impact attitudes, and output the calculation result as intermediate data; According to the first simulation result, the stress distribution and strain distribution of the optical lens as a whole and each component under different impact attitudes are analyzed to determine whether the structural stability of the optical lens meets the design requirements; According to the first simulation result, the maximum stress value and the maximum strain value of each component of the optical lens under different impact attitudes are obtained, and are compared with the set threshold value to determine whether the stress of each component of the optical lens meets the design requirements; The second simulation module is further configured to obtain the optical performance change amount of the optical lens under different impact attitudes according to the intermediate data, and compare the optical performance change amount with the set threshold value to determine whether the optical performance of the optical lens meets the design requirements.

6. The simulation analysis device according to claim 5, wherein the pre-processing module is further configured to perform geometric cleaning on the three-dimensional model of the optical lens.

7. The simulation analysis device according to claim 5, wherein the first simulation module is further configured to perform mesh division on the three-dimensional model of the optical lens to obtain a mesh model, perform impact simulation calculation on the mesh model according to the design parameters, material parameters, impact attitude, impact condition and parameters of the impact object of the optical lens, and obtain a first simulation result.

Images